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JP2013028254A - Master cylinder - Google Patents

Master cylinder Download PDF

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JP2013028254A
JP2013028254A JP2011165319A JP2011165319A JP2013028254A JP 2013028254 A JP2013028254 A JP 2013028254A JP 2011165319 A JP2011165319 A JP 2011165319A JP 2011165319 A JP2011165319 A JP 2011165319A JP 2013028254 A JP2013028254 A JP 2013028254A
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diameter
surface portion
inner diameter
cylinder
seal member
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JP5802466B2 (en
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Hiroki Okada
裕樹 岡田
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Hitachi Astemo Ltd
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Hitachi Automotive Systems Ltd
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Abstract

PROBLEM TO BE SOLVED: To improve efficiency in the manufacture of a master cylinder which supplies hydraulic pressure to wheel cylinders of a vehicle.SOLUTION: A flange part 114 is provided on a tip side of an insertion part 34, extending outside in the radial direction. A connection part 28 includes: an annular fitting convex part 38 provided on a tip side of the inner peripheral surface thereof and having a diameter larger than the outer diameter of the flange part 114; a middle-diameter part 39 provided on a base end side of the fitting convex part 38 and having a diameter larger than that of the fitting convex part 38; a large-diameter part 40 provided on a base end side of the middle-diameter part 39 and having a diameter larger than that of the middle-diameter part 39; and a small-diameter part 41 provided on a base end side of the large diameter part 40 at a position, at which the small-diameter part 41 can face the flange part 114, and having a diameter smaller than that of the fitting convex part 38. A seal member 13 includes: a large-diameter base end part 68 which abuts on a distal end surface 35 of the connection part 28; an annular fitting concave part 69, in which the fitting convex part 38 of the connection part 28 is to be fitted; and a seal cylinder part 70 provided on a side opposite to the base end part 68 of the fitting concave part 69 so as to abut on the insertion part 34 and the middle-diameter part 39 of the connection part 28.

Description

本発明は、車両のホイールシリンダへ液圧を供給するマスタシリンダに関する。   The present invention relates to a master cylinder that supplies hydraulic pressure to a wheel cylinder of a vehicle.

車両のホイールシリンダへ液圧を供給するマスタシリンダにおいて、シリンダに作動液を供給するリザーバのシリンダからの外れを抑制する技術がある(例えば特許文献1参照)。   In a master cylinder that supplies hydraulic pressure to a wheel cylinder of a vehicle, there is a technique for suppressing detachment of a reservoir that supplies hydraulic fluid to the cylinder from the cylinder (see, for example, Patent Document 1).

特開2001−158337号公報JP 2001-158337 A

上記のようにリザーバのシリンダからの外れを抑制する構造を採用すると、リザーバをシリンダへ組み付けにくくなり、マスタシリンダの製造効率を低下させてしまう可能性がある。   If a structure that suppresses the removal of the reservoir from the cylinder as described above is employed, it is difficult to assemble the reservoir to the cylinder, which may reduce the manufacturing efficiency of the master cylinder.

したがって、本発明は、マスタシリンダの製造効率の向上を目的とする。   Therefore, an object of the present invention is to improve the manufacturing efficiency of the master cylinder.

上記目的を達成するために、本発明は、リザーバの挿入部は、先端側に径方向外側へ拡がる鍔部を有し、シリンダの接続部は、その内周面の先端側に設けられ前記鍔部の外径より大径の環状の第1内径部と、該第1内径部の基端側に設けられ該第1内径部より大径の第2内径部と、該第2内径部の基端側にあって該第2内径部より大径の第3内径部とを有し、シール部材は、前記接続部の先端面に当接する大径の基端部と、前記接続部の第1内径部が嵌合する環状の嵌合部と、該嵌合部における前記基端部と軸方向反対側の位置に設けられ前記挿入部と前記接続部の第2内径部とに当接するシール筒部とを有する。   In order to achieve the above object, according to the present invention, the insertion portion of the reservoir has a flange portion extending radially outward on the distal end side, and the connecting portion of the cylinder is provided on the distal end side of the inner peripheral surface thereof. An annular first inner diameter portion having a diameter larger than the outer diameter of the first portion, a second inner diameter portion provided on the proximal end side of the first inner diameter portion and having a larger diameter than the first inner diameter portion, and a base of the second inner diameter portion A third inner diameter portion which is on the end side and is larger in diameter than the second inner diameter portion, and the sealing member has a large diameter proximal end portion which comes into contact with the distal end surface of the connection portion; An annular fitting portion into which the inner diameter portion is fitted, and a seal cylinder that is provided at a position opposite to the base end portion in the fitting portion in the axial direction and abuts on the insertion portion and the second inner diameter portion of the connection portion Part.

本発明によれば、マスタシリンダの製造効率を向上させることができる。   According to the present invention, the manufacturing efficiency of the master cylinder can be improved.

第1実施形態のマスタシリンダを示す要部を断面とした側面図である。It is the side view which made the principal part which shows the master cylinder of 1st Embodiment a cross section. 第1実施形態のマスタシリンダの接続部を示す部分拡大断面図である。It is a partial expanded sectional view which shows the connection part of the master cylinder of 1st Embodiment. 第1実施形態のマスタシリンダのシール部材を示すもので、(a)は断面図、(b)は正面図である。The sealing member of the master cylinder of 1st Embodiment is shown, (a) is sectional drawing, (b) is a front view. 第1実施形態のマスタシリンダの挿入部を示す部分拡大断面図である。It is a partial expanded sectional view which shows the insertion part of the master cylinder of 1st Embodiment. 第1実施形態のマスタシリンダの組み付け手順を(a)〜(c)の順に示す部分拡大断面図である。It is a partial expanded sectional view which shows the assembly | attachment procedure of the master cylinder of 1st Embodiment in order of (a)-(c). 第2実施形態のマスタシリンダのシール部材を示すもので、(a)は断面図、(b)は正面図である。The sealing member of the master cylinder of 2nd Embodiment is shown, (a) is sectional drawing, (b) is a front view. 第2実施形態のマスタシリンダの組み付け手順を(a)〜(d)の順に示す部分拡大断面図である。It is a partial expanded sectional view which shows the assembly | attachment procedure of the master cylinder of 2nd Embodiment in order of (a)-(d). 第3実施形態のマスタシリンダの接続部を示す部分拡大断面図である。It is a partial expanded sectional view which shows the connection part of the master cylinder of 3rd Embodiment. 第3実施形態のマスタシリンダの組み付け手順を(a)〜(b)の順に示す部分拡大断面図である。It is a partial expanded sectional view which shows the assembly | attachment procedure of the master cylinder of 3rd Embodiment in order of (a)-(b).

以下、本発明の各実施形態のマスタシリンダを説明する。   Hereinafter, the master cylinder of each embodiment of the present invention will be described.

「第1実施形態」
第1実施形態のマスタシリンダについて図1〜図5を参照して説明する。このマスタシリンダは、図1に示すように、マスタシリンダ本体11と、マスタシリンダ本体11の鉛直方向上側に一体的に取り付けられる合成樹脂製のリザーバ12と、これらの隙間をシールする一対のゴム製のシール部材13,13とを有している。マスタシリンダ本体11は、図示略のブレーキペダルの操作量に応じた作動液圧を発生させて車輪に設けられたディスクブレーキあるいはドラムブレーキ等のホイールシリンダに供給する。リザーバ12は、作動液(作動流体)を貯蔵し必要に応じてマスタシリンダ本体11に供給する。
“First Embodiment”
The master cylinder of 1st Embodiment is demonstrated with reference to FIGS. As shown in FIG. 1, the master cylinder includes a master cylinder main body 11, a synthetic resin reservoir 12 that is integrally attached to the upper side of the master cylinder main body 11 in the vertical direction, and a pair of rubber seals that seal these gaps. The sealing members 13 and 13 are provided. The master cylinder body 11 generates a hydraulic fluid pressure corresponding to an operation amount of a brake pedal (not shown) and supplies it to a wheel cylinder such as a disc brake or a drum brake provided on the wheel. The reservoir 12 stores the working fluid (working fluid) and supplies it to the master cylinder body 11 as necessary.

マスタシリンダ本体11は、底部15と、底部15の周縁部からその軸方向に伸びる筒部16とを有する有底筒状のシリンダ17を有している。このシリンダ17は、アルミニウム合金等の金属からなるもので、長手方向が例えば車両前後方向に沿う姿勢で車載されるようになっている。   The master cylinder body 11 has a bottomed cylindrical cylinder 17 having a bottom portion 15 and a cylindrical portion 16 extending in the axial direction from the peripheral portion of the bottom portion 15. The cylinder 17 is made of a metal such as an aluminum alloy, and is mounted on the vehicle so that the longitudinal direction thereof is, for example, along the vehicle longitudinal direction.

マスタシリンダ本体11は、シリンダ17内の底部15とは反対側に摺動可能に挿入されるプライマリピストン(ピストン)21と、シリンダ17内の底部15側に摺動可能に挿入されるセカンダリピストン(ピストン)22とを有している。シリンダ17内には、セカンダリピストン22とシリンダ17の底部15と筒部16とでセカンダリ圧力室23が画成されている。また、シリンダ17内には、セカンダリピストン22とプライマリピストン21とシリンダ17の筒部16とでプライマリ圧力室24が画成されている。なお、図示は略すが、セカンダリピストン22とシリンダ17の底部15との間には、ブレーキペダルから入力がない非制動状態で、これらセカンダリピストン22とシリンダ17の底部15との間隔を決めるスプリングを含む間隔形成部が設けられている。また、セカンダリピストン22とプライマリピストン21との間にも、非制動状態で、これらセカンダリピストン22とプライマリピストン21との間隔を決めるスプリングを含む間隔形成部が設けられている。   The master cylinder body 11 includes a primary piston (piston) 21 slidably inserted on the side opposite to the bottom 15 in the cylinder 17 and a secondary piston (slidably inserted on the bottom 15 side in the cylinder 17). Piston) 22. In the cylinder 17, a secondary pressure chamber 23 is defined by the secondary piston 22, the bottom portion 15 of the cylinder 17, and the cylindrical portion 16. In the cylinder 17, a primary pressure chamber 24 is defined by the secondary piston 22, the primary piston 21, and the cylinder portion 16 of the cylinder 17. Although not shown, a spring that determines the distance between the secondary piston 22 and the bottom portion 15 of the cylinder 17 is provided between the secondary piston 22 and the bottom portion 15 of the cylinder 17 in a non-braking state without input from the brake pedal. An interval forming portion is provided. An interval forming portion including a spring that determines an interval between the secondary piston 22 and the primary piston 21 is also provided between the secondary piston 22 and the primary piston 21 in a non-braking state.

そして、マスタシリンダ本体11においては、図示略のブレーキペダルの操作でプライマリピストン21がセカンダリピストン22側に摺動すると、シリンダ17内のプライマリ圧力室24の圧力が上昇する。この上昇した圧力が一方の系統のブレーキ配管に連結されたホイールシリンダに伝達される。また、このプライマリピストン21の摺動で図示略の間隔形成部を介してセカンダリピストン22がシリンダ17の底部15側に摺動することになる。これにより、シリンダ17内のセカンダリ圧力室23の圧力が上昇し、この圧力が他方の系統のブレーキ配管に連結されたホイールシリンダに伝達される。つまり、シリンダ17は、プライマリピストン21およびセカンダリピストン22が摺動することでホイールシリンダに伝達される圧力を発生するようになっている。   In the master cylinder body 11, when the primary piston 21 slides toward the secondary piston 22 by operating a brake pedal (not shown), the pressure in the primary pressure chamber 24 in the cylinder 17 increases. This increased pressure is transmitted to the wheel cylinder connected to the brake piping of one system. Further, the sliding of the primary piston 21 causes the secondary piston 22 to slide toward the bottom 15 of the cylinder 17 through a gap forming portion (not shown). Thereby, the pressure of the secondary pressure chamber 23 in the cylinder 17 rises, and this pressure is transmitted to the wheel cylinder connected to the brake piping of the other system. That is, the cylinder 17 generates pressure transmitted to the wheel cylinder when the primary piston 21 and the secondary piston 22 slide.

シリンダ17には、リザーバ12を接続させる一対の接続部28,28が並設されている。これら接続部28,28は、筒部16の軸方向の中間位置に、筒部16の径方向の外側に突出するように一体に形成されている。これら接続部28,28は、筒部16の円周方向の位置を互いに合わせて筒部16の軸方向の前後に離間して形成されており、それぞれ、内側にシリンダ17の筒部16の径方向に沿う接続穴29が形成されることで、シリンダ17の筒部16の径方向に沿う筒状をなしている。   The cylinder 17 is provided with a pair of connection portions 28, 28 for connecting the reservoir 12. These connecting portions 28 and 28 are integrally formed at an intermediate position in the axial direction of the cylindrical portion 16 so as to protrude outward in the radial direction of the cylindrical portion 16. These connecting portions 28 and 28 are formed so as to be aligned with each other in the circumferential direction of the cylindrical portion 16 and separated from each other in the axial direction of the cylindrical portion 16. By forming the connection hole 29 along the direction, a cylindrical shape is formed along the radial direction of the cylindrical portion 16 of the cylinder 17.

リザーバ12は、液補給口30を有するリザーバ本体31と、液補給口30を開閉する着脱可能な蓋体32とを有している。リザーバ本体31は、外部からの作動液の補給用の上記した液補給口30と、液補給口30の下側にあって作動液を貯留する容器部33と、容器部33の下側に並設されシリンダ17の一対の接続部28,28に挿入されてシリンダ17に作動液を供給する一対の挿入部34,34とを有している。これら挿入部34,34は、互いに平行な筒状をなしてリザーバ本体31に一体形成されている。具体的には、容器部33から液補給口30とは反対側、言い換えれば、鉛直方向下方に突出して形成されている。   The reservoir 12 includes a reservoir body 31 having a liquid supply port 30 and a detachable lid 32 that opens and closes the liquid supply port 30. The reservoir body 31 includes the above-described liquid replenishing port 30 for replenishing hydraulic fluid from the outside, a container portion 33 that is below the liquid replenishing port 30 and stores hydraulic fluid, and is arranged below the container portion 33. And a pair of insertion portions 34, 34 that are inserted into the pair of connection portions 28, 28 of the cylinder 17 and supply hydraulic fluid to the cylinder 17. These insertion portions 34 and 34 are formed integrally with the reservoir body 31 in a cylindrical shape parallel to each other. Specifically, it is formed so as to protrude from the container portion 33 to the side opposite to the liquid supply port 30, in other words, downward in the vertical direction.

リザーバ12の一方の挿入部34は、シリンダ17の一方の接続部28に、一方のシール部材13を介して接続される。また、リザーバ12の他方の挿入部34は、シリンダ17の他方の接続部28に、他方のシール部材13を介して接続される。よって、マスタシリンダ本体11は、そのシリンダ17の一対の接続部28,28にて、リザーバ12からの作動液の供給を受ける。一対のシール部材13,13は、大略筒状をなしており、それぞれが、対応する接続部28とこれに挿入される挿入部34との間に設けられている。一対のシール部材13,13は、弾性を有しており、それぞれの接続部28および挿入部34間をシールする。   One insertion portion 34 of the reservoir 12 is connected to one connection portion 28 of the cylinder 17 via one seal member 13. The other insertion portion 34 of the reservoir 12 is connected to the other connection portion 28 of the cylinder 17 via the other seal member 13. Therefore, the master cylinder body 11 receives the supply of hydraulic fluid from the reservoir 12 at the pair of connection portions 28, 28 of the cylinder 17. The pair of seal members 13 and 13 has a generally cylindrical shape, and each is provided between the corresponding connection portion 28 and the insertion portion 34 inserted therein. The pair of seal members 13 and 13 has elasticity and seals between the connection portion 28 and the insertion portion 34.

上記したシリンダ17の一方の接続部28への一方のシール部材13を介した一方の挿入部34の取り付けは、他方の接続部28への他方のシール部材13を介した他方の挿入部34の取り付けと、同じ構造になっている。このため、図2〜図5を参照しつつ、以下に、一方の接続部28と、一方のシール部材13と、一方の挿入部34と、これらの接合構造について、詳細に説明する。   The attachment of one insertion portion 34 to one connection portion 28 of the cylinder 17 via one seal member 13 is performed by attaching the other insertion portion 34 to the other connection portion 28 via the other seal member 13. It has the same structure as the installation. For this reason, referring to FIGS. 2 to 5, one connecting portion 28, one sealing member 13, one inserting portion 34, and a joining structure thereof will be described in detail below.

まず、シリンダ17の接続部28について説明する。図2に示すように、接続部28は、開口端、つまり筒部16とは反対端の先端面35が接続穴29に直交する平坦な円環状をなして形成されている。また、接続部28の筒部16側の基端側底面36が接続穴29に直交する平坦な円形状をなして形成されている。   First, the connecting portion 28 of the cylinder 17 will be described. As shown in FIG. 2, the connection portion 28 is formed so that the opening end, that is, the distal end surface 35 opposite to the cylindrical portion 16 forms a flat annular shape perpendicular to the connection hole 29. In addition, the base end side bottom surface 36 of the connection portion 28 on the cylinder portion 16 side is formed in a flat circular shape perpendicular to the connection hole 29.

そして、接続部28は、その内周面に、嵌合凸部38と、中径部39と、大径部40と、小径部41とを有している。嵌合凸部38(第1内径部)は、接続部28の開口側つまり先端面35側に内側に突出する円環状に形成されている。中径部39(第2内径部)は、嵌合凸部38の軸方向の筒部16側つまり基端側に嵌合凸部38と隣り合って設けられ、嵌合凸部38よりも大径の内径寸法を有して形成されている。大径部40(第3内径部)は、中径部39の軸方向の筒部16側に中径部39と隣り合って設けられ、中径部39よりも大径の内径寸法を有して形成されている。小径部41(第4内径部)は、大径部40の軸方向の筒部16側に大径部40と隣り合って設けられ、嵌合凸部38、中径部39および大径部40のいずれの内径寸法よりも小径に形成されている。   And the connection part 28 has the fitting convex part 38, the intermediate diameter part 39, the large diameter part 40, and the small diameter part 41 in the internal peripheral surface. The fitting convex portion 38 (first inner diameter portion) is formed in an annular shape protruding inwardly on the opening side of the connecting portion 28, that is, on the distal end surface 35 side. The medium diameter portion 39 (second inner diameter portion) is provided adjacent to the fitting convex portion 38 on the cylindrical portion 16 side, that is, the base end side in the axial direction of the fitting convex portion 38, and is larger than the fitting convex portion 38. It is formed to have an inner diameter dimension. The large-diameter portion 40 (third inner diameter portion) is provided adjacent to the intermediate-diameter portion 39 on the side of the cylindrical portion 16 in the axial direction of the intermediate-diameter portion 39 and has an inner diameter dimension larger than that of the intermediate-diameter portion 39. Is formed. The small-diameter portion 41 (fourth inner diameter portion) is provided adjacent to the large-diameter portion 40 on the cylindrical portion 16 side in the axial direction of the large-diameter portion 40, and includes a fitting convex portion 38, a medium-diameter portion 39, and a large-diameter portion 40. The diameter is smaller than any of the inner diameter dimensions.

嵌合凸部38は、先端テーパ面部44と、先端側円筒面部45と、小テーパ面部46と、段面部47とを有している。   The fitting convex portion 38 has a tip tapered surface portion 44, a tip side cylindrical surface portion 45, a small taper surface portion 46, and a step surface portion 47.

先端テーパ面部44は、先端面35の内周縁部から筒部16側ほど小径となるテーパ状をなして筒部16側に延出する。先端側円筒面部45は、先端テーパ面部44の筒部16側の端縁部から一定径で筒部16側に延出する。小テーパ面部46は、先端側円筒面部45の筒部16側の端縁部から筒部16側ほど大径となるテーパ状をなして筒部16側に延出する。段面部47は、小テーパ面部46の筒部16側の端縁部から径方向外側に一定幅で広がる円環状をなす。   The tip tapered surface portion 44 has a tapered shape with a smaller diameter from the inner peripheral edge of the tip surface 35 toward the tube portion 16 side, and extends toward the tube portion 16 side. The distal-end-side cylindrical surface portion 45 extends from the end edge portion on the tubular portion 16 side of the distal-end tapered surface portion 44 to the tubular portion 16 side with a constant diameter. The small taper surface portion 46 has a taper shape with a diameter increasing toward the tube portion 16 side from the end portion on the tube portion 16 side of the front end side cylindrical surface portion 45 and extends toward the tube portion 16 side. The stepped surface portion 47 forms an annular shape that spreads with a constant width radially outward from the edge portion on the cylindrical portion 16 side of the small tapered surface portion 46.

中径部39は、段面部47の大径側の端縁部から一定径で筒部16側に延出する中間円筒面部50を有している。この中間円筒面部50は、先端側円筒面部45よりも大径となっている。   The medium diameter portion 39 has an intermediate cylindrical surface portion 50 that extends from the end portion on the large diameter side of the stepped surface portion 47 to the cylindrical portion 16 side with a constant diameter. The intermediate cylindrical surface portion 50 has a larger diameter than the distal end side cylindrical surface portion 45.

大径部40は、テーパ面部53(縮径部)と、湾曲面部54と、テーパ面部55とを有している。   The large diameter portion 40 has a tapered surface portion 53 (reduced diameter portion), a curved surface portion 54, and a tapered surface portion 55.

テーパ面部53は、中間円筒面部50の筒部16側の端縁部から筒部16側ほど大径となるテーパ状をなして筒部16側に延出する。言い換えれば、大径部40のテーパ面部53は、中径部39へ向けて徐々に縮径する。湾曲面部54は、テーパ面部53の筒部16側の端縁部から筒部16側ほど大径となった後、筒部16側ほど小径となるように、筒部16側に延出し、接続穴29の中心軸線を含む断面での断面形状が円弧状をなす。   The taper surface portion 53 has a taper shape with a diameter increasing toward the tube portion 16 side from the edge portion on the tube portion 16 side of the intermediate cylindrical surface portion 50 and extends to the tube portion 16 side. In other words, the tapered surface portion 53 of the large diameter portion 40 is gradually reduced in diameter toward the medium diameter portion 39. The curved surface portion 54 extends from the edge of the tapered surface portion 53 on the tube portion 16 side toward the tube portion 16 side and then extends toward the tube portion 16 side so that the diameter decreases toward the tube portion 16 side. The cross-sectional shape in the cross section including the central axis of the hole 29 forms an arc shape.

テーパ面部55は、湾曲面部54の筒部16側の端縁部から筒部16側ほど小径となるテーパ状をなして筒部16側に延出する。テーパ面部55は、その最小径が、先端側円筒面部45および中間円筒面部50よりも小径となっており、中間円筒面部50の径以上の大径部分が大径部40を構成している。つまり、テーパ面部55は、中間円筒面部50の延長面の交線位置を境界に、湾曲面部54側が大径部40を、湾曲面部54とは反対側が小径部41を構成する。   The tapered surface portion 55 extends from the end portion of the curved surface portion 54 on the tubular portion 16 side to a tubular portion 16 side with a tapered shape having a smaller diameter toward the tubular portion 16 side. The tapered surface portion 55 has a minimum diameter that is smaller than that of the distal-end-side cylindrical surface portion 45 and the intermediate cylindrical surface portion 50, and a large-diameter portion that is equal to or larger than the diameter of the intermediate cylindrical surface portion 50 constitutes the large-diameter portion 40. That is, the tapered surface portion 55 forms the large-diameter portion 40 on the curved surface portion 54 side and the small-diameter portion 41 on the opposite side to the curved surface portion 54 with the intersection line position of the extended surface of the intermediate cylindrical surface portion 50 as a boundary.

小径部41は、上記したテーパ面部55の中間円筒面部50よりも小径の部分と、基端側円筒面部58と、基端側テーパ面部59とを有している。   The small diameter portion 41 includes a portion having a smaller diameter than the intermediate cylindrical surface portion 50 of the tapered surface portion 55 described above, a proximal end cylindrical surface portion 58, and a proximal end side tapered surface portion 59.

基端側円筒面部58は、テーパ面部55の筒部16側の端縁部から一定径で筒部16側に延出する。よって、基端側円筒面部58は、中間円筒面部50よりも小径となっており、先端側円筒面部45よりも小径となっていて、小径部41は、嵌合凸部38よりも小径となっている。基端側テーパ面部59は、基端側円筒面部58の筒部16側の端縁部から筒部16側ほど小径となるテーパ状をなして筒部16側に延出して基端面36に繋がる。   The proximal end cylindrical surface portion 58 extends from the end portion of the tapered surface portion 55 on the tubular portion 16 side to the tubular portion 16 side with a constant diameter. Therefore, the proximal-side cylindrical surface portion 58 has a smaller diameter than the intermediate cylindrical surface portion 50, a smaller diameter than the distal-end-side cylindrical surface portion 45, and the small-diameter portion 41 has a smaller diameter than the fitting convex portion 38. ing. The proximal end side tapered surface portion 59 has a tapered shape with a diameter decreasing toward the tubular portion 16 side from the end edge portion on the tubular portion 16 side of the proximal end side cylindrical surface portion 58 and extends to the tubular portion 16 side and is connected to the proximal end surface 36. .

接続部28の開口端の外周側には、先端面35の外周側の端縁部から軸方向の筒部16側ほど大径となるように面取り面60が形成されている。   A chamfered surface 60 is formed on the outer peripheral side of the opening end of the connecting portion 28 so as to have a larger diameter from the outer peripheral edge portion of the distal end surface 35 toward the cylindrical portion 16 side in the axial direction.

なお、上記した先端面35、面取り面60、先端テーパ面部44、先端側円筒面部45、小テーパ面部46、段面部47、中間円筒面部50、テーパ面部53、湾曲面部54、テーパ面部55、基端側円筒面部58および基端側テーパ面部59は、すべて中心軸線を一致させている。よって、嵌合凸部38、中径部39、大径部40および小径部41も、すべて中心軸線を一致させており、これが接続穴29の中心軸線となっている。   The tip surface 35, the chamfered surface 60, the tip tapered surface portion 44, the tip side cylindrical surface portion 45, the small taper surface portion 46, the stepped surface portion 47, the intermediate cylindrical surface portion 50, the taper surface portion 53, the curved surface portion 54, the taper surface portion 55, and the base. The end side cylindrical surface portion 58 and the base end side tapered surface portion 59 all have the same central axis. Therefore, the fitting convex portion 38, the medium diameter portion 39, the large diameter portion 40 and the small diameter portion 41 all have the same central axis, and this is the central axis of the connection hole 29.

次に、シリンダ17の接続部28への嵌合前であってリザーバ12の挿入部34の挿入前の自然状態にあるゴム製のシール部材13について説明する。図3に示すように、シール部材13は、筒状をなしており、軸方向一端の大径端面63とこれより小径の軸方向他端の小径端面64とが軸直交方向に広がる平坦な形状をなしている。   Next, the rubber seal member 13 in a natural state before the cylinder 17 is fitted to the connection portion 28 and before the insertion portion 34 of the reservoir 12 is inserted will be described. As shown in FIG. 3, the seal member 13 has a cylindrical shape, and has a flat shape in which a large-diameter end surface 63 at one end in the axial direction and a small-diameter end surface 64 at the other end in the axial direction having a smaller diameter extend in the direction perpendicular to the axis. I am doing.

シール部材13は、その外周面に、大径の円環状の基端部68と、基端部68に軸方向に隣り合って設けられた、最小径が基端部68よりも小径で径方向内方に凹む円環状の嵌合凹部69(嵌合部)とを有している。また、嵌合凹部69の基端部68とは反対側に軸方向に隣り合って設けられた、嵌合凹部69の最小径よりも大径かつ基端部68よりも小径の筒状のシール筒部70を有している。   The sealing member 13 has a large-diameter annular base end 68 on the outer peripheral surface thereof, and is provided adjacent to the base end 68 in the axial direction. The minimum diameter is smaller than the base end 68 and is radial. It has an annular fitting recess 69 (fitting portion) that is recessed inward. In addition, a cylindrical seal having a diameter larger than the minimum diameter of the fitting recess 69 and smaller than the base end 68 provided adjacent to the base end 68 of the fitting recess 69 in the axial direction. A cylindrical portion 70 is provided.

基端部68は、一端側円筒面部73と、一端側段面部74と、中間円筒面部75と、中間段面部76とを有している。   The base end portion 68 includes a one end side cylindrical surface portion 73, one end side step surface portion 74, an intermediate cylindrical surface portion 75, and an intermediate step surface portion 76.

一端側円筒面部73は、大径端面63の外周縁部から一定径で小径端面64側に延出する。一端側段面部74は、一端側円筒面部73の小径端面64側の端縁部から径方向内側に一定幅で広がる円環状をなす。   The one end side cylindrical surface portion 73 extends from the outer peripheral edge portion of the large diameter end surface 63 to the small diameter end surface 64 side with a constant diameter. The one-end-side stepped surface portion 74 has an annular shape that spreads from the end edge portion on the small-diameter end surface 64 side of the one-end-side cylindrical surface portion 73 radially inward with a constant width.

中間円筒面部75は、一端側段面部74の小径側の端縁部から一定径で小径端面64側に延出する。よって、中間円筒面部75は、一端側円筒面部73よりも小径となっている。中間段面部76は、中間円筒面部75の小径端面64側の端縁部から径方向内側に一定幅で広がる円環状をなす。   The intermediate cylindrical surface portion 75 extends from the end portion on the small diameter side of the one end side step surface portion 74 to the small diameter end surface 64 side with a constant diameter. Therefore, the intermediate cylindrical surface portion 75 has a smaller diameter than the one end side cylindrical surface portion 73. The intermediate step surface portion 76 has an annular shape that spreads from the end edge portion on the small diameter end surface 64 side of the intermediate cylindrical surface portion 75 to the inside in the radial direction with a constant width.

ここで、基端部68は、その最小径が、図2に示す接続部28の開口側端部の外径よりも大径となっている。つまり、基端部68の一端側円筒面部73、一端側段面部74および中間円筒面部75の径は、いずれも、接続部28の先端面35の外径よりも大径となっており、面取り面60の外径よりも大径となっている。   Here, the minimum diameter of the base end part 68 is larger than the outer diameter of the opening side end part of the connection part 28 shown in FIG. That is, the diameters of the one end side cylindrical surface portion 73, the one end side step surface portion 74, and the intermediate cylindrical surface portion 75 of the base end portion 68 are all larger than the outer diameter of the distal end surface 35 of the connection portion 28, The diameter is larger than the outer diameter of the surface 60.

嵌合凹部69は、中間段面部76の小径側の一部と、湾曲面部79と、最小径円筒面部80と、湾曲面部81と、他端側段面部82とを有している。   The fitting recess 69 includes a part on the small diameter side of the intermediate step surface portion 76, a curved surface portion 79, a minimum diameter cylindrical surface portion 80, a curved surface portion 81, and the other end side step surface portion 82.

湾曲面部79は、中間段面部76の小径側の端縁部から小径端面64側ほど小径となるように小径端面64側に延出し、シール部材13の中心軸線を含む断面での断面形状が円弧状をなす。   The curved surface portion 79 extends from the end portion on the small diameter side of the intermediate step surface portion 76 toward the small diameter end surface 64 so that the diameter decreases toward the small diameter end surface 64, and the cross-sectional shape in a cross section including the central axis of the seal member 13 is circular. It forms an arc.

最小径円筒面部80は、湾曲面部79の小径側の端縁部から一定径で小径端面64側に延出する。よって、最小径円筒面部80は、一端側円筒面部73および中間円筒面部75よりも小径となっている。   The minimum-diameter cylindrical surface portion 80 extends from the end portion on the small-diameter side of the curved surface portion 79 to the small-diameter end surface 64 side with a constant diameter. Therefore, the minimum diameter cylindrical surface portion 80 has a smaller diameter than the one end side cylindrical surface portion 73 and the intermediate cylindrical surface portion 75.

湾曲面部81は、最小径円筒面部80の小径端面64側の端縁部から小径端面64側ほど大径となるように小径端面64側に延出し、シール部材13の中心軸線を含む断面での断面形状が円弧状をなす。他端側段面部82は、湾曲面部81の小径端面64側の端縁部から径方向外側に一定幅で広がる円環状をなす。   The curved surface portion 81 extends from the end portion on the small diameter end surface 64 side of the minimum diameter cylindrical surface portion 80 toward the small diameter end surface 64 so as to increase in diameter toward the small diameter end surface 64 side, and in a cross section including the central axis of the seal member 13. The cross-sectional shape is arcuate. The other-end-side stepped surface portion 82 has an annular shape that spreads from the end edge portion of the curved surface portion 81 on the small-diameter end surface 64 side to the radially outer side with a constant width.

ここで、嵌合凹部69の最小外径は、図2に示す接続部28の嵌合凸部38の最小内径よりも大径となっている。つまり、嵌合凹部69の最小径円筒面部80は、嵌合凸部38の先端側円筒面部45よりも大径となっている。また、嵌合凹部69の軸方向の幅は、接続部28の嵌合凸部38の軸方向長さよりも広くなっている。つまり、嵌合凹部69の中間段面部76と他端側段面部82との間の軸方向の距離は、接続部28の先端面35と段面部47との間の軸方向の距離よりも長くなっている。   Here, the minimum outer diameter of the fitting concave portion 69 is larger than the minimum inner diameter of the fitting convex portion 38 of the connecting portion 28 shown in FIG. That is, the minimum diameter cylindrical surface portion 80 of the fitting concave portion 69 has a larger diameter than the distal end side cylindrical surface portion 45 of the fitting convex portion 38. The axial width of the fitting recess 69 is wider than the axial length of the fitting projection 38 of the connection portion 28. That is, the axial distance between the intermediate step surface portion 76 of the fitting recess 69 and the other end side step surface portion 82 is longer than the axial distance between the tip surface 35 of the connection portion 28 and the step surface portion 47. It has become.

シール筒部70には、2本の同外径のリブ85,86とこれらの間にあってこれらよりも小外径のリブ87とが形成されている。シール筒部70は、リブ85の外表面を構成する凸面部88と、リブ87の外表面を構成する凸面部89と、リブ86の外表面を構成する凸面部90と、他端側円筒面部91と、他端側テーパ面部92とを有している。   The seal cylinder portion 70 is formed with two ribs 85 and 86 having the same outer diameter and a rib 87 having a smaller outer diameter between them. The seal tube portion 70 includes a convex surface portion 88 that forms the outer surface of the rib 85, a convex surface portion 89 that forms the outer surface of the rib 87, a convex surface portion 90 that forms the outer surface of the rib 86, and a cylindrical surface portion on the other end side. 91 and the other end side tapered surface portion 92.

凸面部88は、他端側段面部82の外径側の端縁部から小径端面64側ほど大径となるように拡径した後、小径端面64側ほど小径となるように縮径しつつ、小径端面64側に延出する。凸面部88は、シール部材13の中心軸線を含む断面での断面形状が円弧状をなす。   The convex surface portion 88 is expanded from the end portion on the outer diameter side of the other end side step surface portion 82 so as to increase in diameter toward the small diameter end surface 64 side, and then contracted to decrease in diameter toward the small diameter end surface 64 side. , Extending to the small diameter end face 64 side. The convex surface portion 88 has an arc shape in cross section including the central axis of the seal member 13.

凸面部89は、凸面部88の小径端面64側の端縁部から小径端面64側ほど大径となるように拡径した後、小径端面64側ほど小径となるように縮径しつつ、小径端面64側に延出する。凸面部89も、シール部材13の中心軸線を含む断面での断面形状が円弧状をなす。   The convex surface portion 89 is increased in diameter from the end portion on the small diameter end surface 64 side of the convex surface portion 88 so as to become larger in diameter toward the small diameter end surface 64 side, and then reduced in diameter so as to become smaller in diameter on the small diameter end surface 64 side. It extends to the end face 64 side. The convex surface portion 89 also has an arc shape in cross section including the central axis of the seal member 13.

凸面部90は、凸面部88の小径端面64側の端縁部から小径端面64側ほど大径となるように拡径した後、小径端面64側ほど小径となるように縮径しつつ、小径端面64側に延出する。凸面部90も、シール部材13の中心軸線を含む断面での断面形状が円弧状をなす。   The convex surface portion 90 expands from the end portion on the small diameter end surface 64 side of the convex surface portion 88 so as to increase in diameter toward the small diameter end surface 64 side, and then decreases in diameter so as to decrease in diameter toward the small diameter end surface 64 side. It extends to the end face 64 side. As for the convex surface part 90, the cross-sectional shape in the cross section including the center axis line of the sealing member 13 forms an arc shape.

他端側円筒面部91は、凸面部90の小径端面64側の端縁部から一定径で小径端面64側に延出する。他端側テーパ面部92は、他端側円筒面部91の小径端面64側の端部から小径端面64側ほど小径となるように小径端面64側にテーパ状に延出して小径端面64に繋がる。   The other end-side cylindrical surface portion 91 extends from the end edge portion of the convex surface portion 90 on the small diameter end surface 64 side to the small diameter end surface 64 side with a constant diameter. The other end-side tapered surface portion 92 extends in a tapered manner from the end on the small-diameter end surface 64 side of the other-end-side cylindrical surface portion 91 toward the small-diameter end surface 64 so as to become smaller in diameter, and is connected to the small-diameter end surface 64.

シール筒部70の最大外径は、接続部28の中径部39よりも大径となっている。つまり、シール筒部70の凸面部88,90の外径は、接続部28の中間円筒面部50の径よりも大径となっている。   The maximum outer diameter of the seal tube portion 70 is larger than the medium diameter portion 39 of the connection portion 28. That is, the outer diameters of the convex surface portions 88 and 90 of the seal cylinder portion 70 are larger than the diameter of the intermediate cylindrical surface portion 50 of the connection portion 28.

シール筒部70の軸方向長さは、接続部28の中径部39の軸方向長さよりも長く、中径部39と大径部40とを合わせた軸方向長さと略同等になっている。言い換えれば、シール筒部70の軸方向長さは、接続部28の中径部39と大径部40と小径部41とを合わせた軸方向長さよりも短くなっている。シール筒部70の他端側段面部82と小径端面64との間の軸方向長さは、接続部28の段面部47と、テーパ面部55の中間円筒面部50の延長面の交線位置との間の軸方向長さと同等であり、接続部28の段面部47とテーパ面部55の基端側円筒面部58側の端部との間の軸方向長さよりも短くなっている。   The axial length of the seal tube portion 70 is longer than the axial length of the medium diameter portion 39 of the connection portion 28 and is substantially equal to the axial length of the medium diameter portion 39 and the large diameter portion 40 combined. . In other words, the axial length of the seal tube portion 70 is shorter than the axial length of the connecting portion 28 including the medium diameter portion 39, the large diameter portion 40, and the small diameter portion 41. The axial length between the other end side step surface portion 82 and the small diameter end surface 64 of the seal cylinder portion 70 is the intersection line position between the step surface portion 47 of the connection portion 28 and the extended surface of the intermediate cylindrical surface portion 50 of the taper surface portion 55. The axial length between the stepped surface portion 47 of the connection portion 28 and the end portion of the tapered surface portion 55 on the proximal end side cylindrical surface portion 58 side is shorter.

シール部材13の内周部には、複数、具体的には2本のリブ95,96が形成されている。シール部材13の内周面は、一端側テーパ面部99と、一端側段面部100と、一端側湾曲面部101と、一端側円筒面部102と、リブ95の外表面を構成する凸面部103と、中間円筒面部104と、リブ96の外表面を構成する凸面部105と、他端側円筒面部106とを有している。   A plurality of, specifically, two ribs 95 and 96 are formed on the inner peripheral portion of the seal member 13. The inner peripheral surface of the seal member 13 includes one end side tapered surface portion 99, one end side stepped surface portion 100, one end side curved surface portion 101, one end side cylindrical surface portion 102, and a convex surface portion 103 constituting the outer surface of the rib 95, The intermediate cylindrical surface portion 104, the convex surface portion 105 constituting the outer surface of the rib 96, and the other end side cylindrical surface portion 106 are provided.

一端側テーパ面部99は、大径端面63の内周縁部から小径端面64側ほど小径となるテーパ状をなして小径端面64側に延出する。一端側段面部100は、一端側テーパ面部99の小径端面64側の端縁部から径方向内側に一定幅で広がる円環状をなす。一端側湾曲面部101は、一端側段面部100の内周縁部から小径端面64側ほど小径となるように小径端面64側に延出し、シール部材13の中心軸線を含む断面での断面形状が円弧状をなす。一端側円筒面部102は、一端側テーパ面部99の小径端面64側の端縁部から一定径で小径端面64側に延出する。   The one end side taper surface 99 has a taper shape with a smaller diameter from the inner peripheral edge of the large diameter end surface 63 toward the small diameter end surface 64 and extends toward the small diameter end surface 64. The one-end-side stepped surface portion 100 has an annular shape that spreads out from the end edge portion on the small-diameter end surface 64 side of the one-end-side tapered surface portion 99 inward in the radial direction. The one-end-side curved surface portion 101 extends from the inner peripheral edge of the one-end-side step surface portion 100 toward the small-diameter end surface 64 so that the diameter decreases toward the small-diameter end surface 64, and the cross-sectional shape in a cross-section including the central axis of the seal member 13 is circular. It forms an arc. The one end-side cylindrical surface portion 102 extends from the end portion on the small-diameter end surface 64 side of the one-end side tapered surface portion 99 to the small-diameter end surface 64 side with a constant diameter.

凸面部103は、一端側円筒面部102の小径端面64側の端縁部から小径端面64側ほど大径となるように拡径した後、小径端面64側ほど小径となるように縮径しつつ、小径端面64側に延出する。凸面部103は、シール部材13の中心軸線を含む断面での断面形状が円弧状をなす。中間円筒面部104は、凸面部103の小径端面64側の端縁部から一端側円筒面部102と同じ一定径で小径端面64側に延出する。凸面部105は、中間円筒面部104の小径端面64側の端縁部から小径端面64側ほど大径となるように拡径した後、小径端面64側ほど小径となるように縮径しつつ、小径端面64側に延出する。凸面部105は、シール部材13の中心軸線を含む断面での断面形状が円弧状をなす。   The convex surface portion 103 is increased in diameter from the edge on the small-diameter end surface 64 side of the one-end-side cylindrical surface portion 102 so that the diameter decreases toward the small-diameter end surface 64, and then decreases in diameter so as to decrease in diameter toward the small-diameter end surface 64. , Extending to the small diameter end face 64 side. The convex surface portion 103 has an arc shape in cross section including the central axis of the seal member 13. The intermediate cylindrical surface portion 104 extends from the end portion on the small diameter end surface 64 side of the convex surface portion 103 to the small diameter end surface 64 side with the same constant diameter as the one end side cylindrical surface portion 102. The convex surface portion 105 expands from the end portion on the small diameter end surface 64 side of the intermediate cylindrical surface portion 104 so that the diameter decreases toward the small diameter end surface 64 side, and then decreases in diameter so as to decrease toward the small diameter end surface 64 side. It extends to the small diameter end face 64 side. The convex surface portion 105 has an arc shape in cross section including the central axis of the seal member 13.

他端側円筒面部106は、凸面部105の小径端面64側の端縁部から一端側円筒面部102および中間円筒面部104と同じ一定径で小径端面64側に延出して小径端面64に繋がる。   The other end-side cylindrical surface portion 106 extends from the end portion on the small-diameter end surface 64 side of the convex portion 105 to the small-diameter end surface 64 side with the same constant diameter as the one-end-side cylindrical surface portion 102 and the intermediate cylindrical surface portion 104 and is connected to the small-diameter end surface 64.

シール部材13の大径端面63、小径端面64、一端側円筒面部73、一端側段面部74、中間円筒面部75、中間段面部76、湾曲面部79、最小径円筒面部80、湾曲面部81、他端側段面部82、凸面部88、凸面部89、凸面部90、他端側円筒面部91、他端側テーパ面部92、一端側テーパ面部99、一端側段面部100、一端側湾曲面部101、一端側円筒面部102、凸面部103、中間円筒面部104、凸面部105および他端側円筒面部106は、すべて中心軸線を一致させており、これがシール部材13の中心軸線となっている。中間円筒面部104、凸面部105および他端側円筒面部106は、シール筒部70の内周面を構成している。   Large diameter end surface 63, small diameter end surface 64, one end side cylindrical surface portion 73, one end side step surface portion 74, intermediate cylindrical surface portion 75, intermediate step surface portion 76, curved surface portion 79, minimum diameter cylindrical surface portion 80, curved surface portion 81, etc. End side step surface portion 82, convex surface portion 88, convex surface portion 89, convex surface portion 90, other end side cylindrical surface portion 91, other end side taper surface portion 92, one end side taper surface portion 99, one end side step surface portion 100, one end side curved surface portion 101, The one end side cylindrical surface portion 102, the convex surface portion 103, the intermediate cylindrical surface portion 104, the convex surface portion 105, and the other end side cylindrical surface portion 106 all have the same central axis, and this is the central axis of the seal member 13. The intermediate cylindrical surface portion 104, the convex surface portion 105, and the other end side cylindrical surface portion 106 constitute an inner peripheral surface of the seal cylinder portion 70.

次に、シール部材13よりも剛性の高い合成樹脂からなる挿入部34について説明する。図4に示すように、リザーバ本体31の容器部33の下面には、上方に凹む収容凹部110が形成されており、この収容凹部110の中央から挿入部34が鉛直方向下方となる方向に突出している。なお、収容凹部110は、挿入部34の中心軸線に直交する円環状の根元面部111と、根元面部111の大径側の端縁部から根元面部111と直交して下方に延出する一定径の円筒面部112とを有している。   Next, the insertion portion 34 made of a synthetic resin having higher rigidity than the seal member 13 will be described. As shown in FIG. 4, an accommodation recess 110 that is recessed upward is formed on the lower surface of the container portion 33 of the reservoir body 31, and the insertion portion 34 protrudes from the center of the accommodation recess 110 in a direction downward in the vertical direction. ing. The housing recess 110 has an annular root surface portion 111 orthogonal to the central axis of the insertion portion 34 and a constant diameter extending downward from the large-diameter end edge of the root surface portion 111 perpendicular to the root surface portion 111. And the cylindrical surface portion 112.

挿入部34は、収容凹部110の根元面部111から先端近傍まで略一定径で延出する円筒状の円筒状部113と、円筒状部113の収容凹部110とは反対の先端側から径方向外側に延びる鍔部114とを有する形状をなしている。   The insertion portion 34 includes a cylindrical cylindrical portion 113 extending at a substantially constant diameter from the base surface portion 111 of the receiving recess 110 to the vicinity of the tip, and a radially outer side from the tip side opposite to the receiving recess 110 of the cylindrical portion 113. It has the shape which has the collar part 114 extended in this.

円筒状部113は、容器部33内と連通するその内周面116が一定径をなしており、その外周面が、根元湾曲面部117と、主円筒面部118とを有している。根元湾曲面部117は、収容凹部110の根元面部111との境界位置にあって鍔部114側ほど小径となるように鍔部114側に延出し、挿入部34の中心軸線を含む断面での断面形状が円弧状をなす。主円筒面部118は、根元湾曲面部117の小径側の端縁部から一定径で根元面部111と垂直をなして延出する。円筒状部113の根元面部111とは反対の先端面119は根元面部111と平行をなす。   The cylindrical portion 113 has an inner peripheral surface 116 that communicates with the inside of the container portion 33 and has a constant diameter, and the outer peripheral surface includes a root curved surface portion 117 and a main cylindrical surface portion 118. The base curved surface portion 117 is located at a boundary position with the root surface portion 111 of the housing recess 110 and extends to the flange portion 114 side so as to have a smaller diameter toward the flange portion 114 side, and a cross section including a central axis of the insertion portion 34 The shape is arcuate. The main cylindrical surface portion 118 extends from the end portion on the small diameter side of the root curved surface portion 117 with a constant diameter and perpendicular to the root surface portion 111. The tip end surface 119 of the cylindrical portion 113 opposite to the root surface portion 111 is parallel to the root surface portion 111.

鍔部114は、係止段面部120と、係止円筒面部121と、先端テーパ面部122とを有している。係止段面部120は、主円筒面部118の先端面119側の端縁部から径方向外側に一定幅で広がる円環状をなす。係止円筒面部121は、係止段面部120の外径側の端縁部から一定径で先端面119側に延出する。先端テーパ面部122は、係止円筒面部121の先端面119側の端縁部から先端面119側ほど小径となるように先端面119側に延出して先端面119に繋がる。   The collar portion 114 has a locking step surface portion 120, a locking cylindrical surface portion 121, and a tip tapered surface portion 122. The locking step surface portion 120 has an annular shape that spreads from the end edge portion of the main cylindrical surface portion 118 on the distal end surface 119 side to the radially outer side with a constant width. The locking cylindrical surface portion 121 extends from the end portion on the outer diameter side of the locking step surface portion 120 to the distal end surface 119 side with a constant diameter. The tip tapered surface portion 122 extends from the edge portion on the tip surface 119 side of the locking cylindrical surface portion 121 to the tip surface 119 side so as to have a smaller diameter toward the tip surface 119 side and is connected to the tip surface 119.

内周面116と、根元湾曲面部117と、主円筒面部118と、係止段面部120と、係止円筒面部121と、先端テーパ面部122と、先端面119とが、すべて中心軸線を一致させており、これが挿入部34の中心軸線となっている。挿入部34の中心軸線は、収容凹部110の根元面部111および円筒面部112の中心軸線とも一致しており、収容凹部110の根元面部111に直交している。   The inner peripheral surface 116, the root curved surface portion 117, the main cylindrical surface portion 118, the locking step surface portion 120, the locking cylindrical surface portion 121, the tip tapered surface portion 122, and the tip surface 119 all have the same center axis. This is the central axis of the insertion portion 34. The central axis of the insertion portion 34 is coincident with the central axis of the base surface portion 111 and the cylindrical surface portion 112 of the housing recess 110 and is orthogonal to the base surface portion 111 of the housing recess 110.

ここで、挿入部34の鍔部114を除く範囲の軸方向長さ、つまり、根元湾曲面部117および主円筒面部118の軸方向長さ、言い換えれば、根元面部111と係止段面部120との間の軸方向長さは、シール部材13の軸方向の全長よりも長くなっている。また、挿入部34の主円筒面部118の径は、シール部材13の一端側円筒面部102、中間円筒面部104および他端側円筒面部106の径と同等になっており、凸面部103,105の最小径よりも大径となっている。また、鍔部114の外径、つまり、係止円筒面部121の径は、シール部材13の一端側円筒面部102、中間円筒面部104および他端側円筒面部106の径よりも大径となっている。また、鍔部114の先端テーパ面部122の最小径は、シール部材13の一端側湾曲面部101の最大径よりも小径となっている。また、収容凹部110の最大径つまり円筒面部112の径は、シール部材13の基端部68の最大外径つまり一端側円筒面部73の径と同等になっている。   Here, the axial length of the range excluding the flange portion 114 of the insertion portion 34, that is, the axial lengths of the root curved surface portion 117 and the main cylindrical surface portion 118, in other words, the root surface portion 111 and the locking step surface portion 120. The axial length between them is longer than the total axial length of the seal member 13. Further, the diameter of the main cylindrical surface portion 118 of the insertion portion 34 is equal to the diameters of the one end side cylindrical surface portion 102, the intermediate cylindrical surface portion 104 and the other end side cylindrical surface portion 106 of the seal member 13. The diameter is larger than the minimum diameter. Further, the outer diameter of the flange 114, that is, the diameter of the locking cylindrical surface portion 121 is larger than the diameters of the one end side cylindrical surface portion 102, the intermediate cylindrical surface portion 104 and the other end side cylindrical surface portion 106 of the seal member 13. Yes. Further, the minimum diameter of the tip tapered surface portion 122 of the flange portion 114 is smaller than the maximum diameter of the one end side curved surface portion 101 of the seal member 13. Further, the maximum diameter of the accommodating recess 110, that is, the diameter of the cylindrical surface portion 112 is equal to the maximum outer diameter of the base end portion 68 of the seal member 13, that is, the diameter of the one end side cylindrical surface portion 73.

挿入部34の鍔部114の外径、つまり、係止円筒面部121の径は、接続部28の環状の嵌合凸部38の内径つまり先端側円筒面部45の径よりも小径となっている。言い換えれば、接続部28の内周面の先端側に設けられた嵌合凸部38は、鍔部114の外径より大径の環状をなしている。   The outer diameter of the flange portion 114 of the insertion portion 34, that is, the diameter of the locking cylindrical surface portion 121 is smaller than the inner diameter of the annular fitting convex portion 38 of the connection portion 28, that is, the diameter of the distal end side cylindrical surface portion 45. . In other words, the fitting convex portion 38 provided on the distal end side of the inner peripheral surface of the connecting portion 28 has an annular shape having a larger diameter than the outer diameter of the flange portion 114.

次に、接続部28とシール部材13と挿入部34との接合構造についてその接合手順に沿って説明する。   Next, the joining structure of the connection part 28, the sealing member 13, and the insertion part 34 is demonstrated along the joining procedure.

まず、図5(a)に示すように、接続部28にシール部材13が嵌合される。このとき、シール部材13は、そのシール筒部70を接続部28の中径部39および大径部40に締め代をもって嵌合させるとともに、その嵌合凹部69に接続部28の嵌合凸部38を締め代をもって嵌合させる。また、その基端部68を接続部28の先端面35に当接させることになる。具体的に、図3に示すシール部材13の中間段面部76が、図2に示す接続部28の先端面35に当接し、図3に示すシール部材13の最小径円筒面部80が、図2に示す接続部28の先端側円筒面部45に当接し、図3に示すシール部材13の他端側段面部82が、図2に示す接続部28の段面部47に当接する。また、図3に示すシール部材13の凸面部88および凸面部89が変形して、図2に示す接続部28の中間円筒面部50に当接し、図3に示すシール部材13の凸面部90および他端側円筒面部91が変形して、図2に示す接続部28のテーパ面部53、湾曲面部54およびテーパ面部55に当接し、図3に示すシール部材13の他端側テーパ面部92が、図2に示す接続部28のテーパ面部55に当接する。   First, as shown in FIG. 5A, the seal member 13 is fitted into the connection portion 28. At this time, the seal member 13 fits the seal cylinder part 70 to the middle diameter part 39 and the large diameter part 40 of the connection part 28 with a tightening margin, and the fitting convex part of the connection part 28 to the fitting recess 69. 38 is fitted with a tightening margin. Further, the base end portion 68 is brought into contact with the distal end surface 35 of the connection portion 28. Specifically, the intermediate step surface portion 76 of the seal member 13 shown in FIG. 3 abuts on the distal end surface 35 of the connection portion 28 shown in FIG. 2, and the minimum diameter cylindrical surface portion 80 of the seal member 13 shown in FIG. 3 is in contact with the front end side cylindrical surface portion 45 of the connection portion 28, and the other end side step surface portion 82 of the seal member 13 shown in FIG. 3 is in contact with the step surface portion 47 of the connection portion 28 shown in FIG. Further, the convex surface portion 88 and the convex surface portion 89 of the seal member 13 shown in FIG. 3 are deformed to come into contact with the intermediate cylindrical surface portion 50 of the connecting portion 28 shown in FIG. 2, and the convex surface portion 90 of the seal member 13 shown in FIG. The other end side cylindrical surface portion 91 is deformed to contact the tapered surface portion 53, the curved surface portion 54 and the tapered surface portion 55 of the connecting portion 28 shown in FIG. 2, and the other end side tapered surface portion 92 of the seal member 13 shown in FIG. It contacts the tapered surface portion 55 of the connecting portion 28 shown in FIG.

次に、図5(a)から図5(b)、さらに図5(c)に示すように、接続部28に保持されたシール部材13に、リザーバ本体の31の挿入部34が挿入される。このとき、まず、挿入部34は、図5(a)に示す先端側の鍔部114の先端テーパ面部122においてシール部材13の一端側湾曲面部101に当接し、その後、鍔部114の係止円筒面部121が、シール部材13の、一端側湾曲面部101、一端側円筒面部102、凸面部103、中間円筒面部104、凸面部105および他端側円筒面部106に順次接触し、これらの接触部分およびその近傍を径方向外側に押し潰し、かつ軸方向に引っ張りながら嵌合していく。その際に、図5(b)に示すように、シール部材13は、中径部39(第2内径部)の前方の大径部40(第3内径部)で径方向外側への変形がより許容されることになり、鍔部114への摺動抵抗を弱めることになる。また、鍔部114で押されることにより外側に変形したシール部材13の部分が大径部40(第3内径部)に収まることになるため、鍔部114の抵抗となる挿入方向前方へのはみ出し量を抑制することになり、この点からも鍔部114への摺動抵抗を弱めることになる。このように、本実施形態においては、大径部40(第3内径部)を有していることにより、挿入部34に鍔部114を設けても、リザーバ12をマスタシリンダ本体11に組み付けづらくなることがない。   Next, as shown in FIGS. 5A to 5B and FIG. 5C, the insertion portion 34 of the reservoir main body 31 is inserted into the seal member 13 held by the connection portion 28. . At this time, first, the insertion portion 34 abuts on the one end side curved surface portion 101 of the seal member 13 at the distal end tapered surface portion 122 of the distal end flange portion 114 shown in FIG. The cylindrical surface portion 121 sequentially comes into contact with the one end side curved surface portion 101, the one end side cylindrical surface portion 102, the convex surface portion 103, the intermediate cylindrical surface portion 104, the convex surface portion 105, and the other end side cylindrical surface portion 106 of the seal member 13, and these contact portions. And the vicinity thereof is crushed outward in the radial direction and fitted while being pulled in the axial direction. At this time, as shown in FIG. 5B, the seal member 13 is deformed outward in the radial direction by the large-diameter portion 40 (third inner diameter portion) in front of the middle diameter portion 39 (second inner diameter portion). It will be permitted more, and the sliding resistance to the flange 114 will be weakened. Further, since the portion of the seal member 13 that has been deformed to the outside by being pushed by the flange portion 114 is accommodated in the large-diameter portion 40 (third inner diameter portion), it protrudes forward in the insertion direction, which becomes a resistance of the flange portion 114. Therefore, the sliding resistance to the flange 114 is weakened from this point as well. As described above, in the present embodiment, since the large-diameter portion 40 (third inner diameter portion) is provided, it is difficult to assemble the reservoir 12 to the master cylinder body 11 even if the flange portion 114 is provided in the insertion portion 34. Never become.

そして、図5(c)に示すように鍔部114が、シール部材13を越えると、シール部材13は、挿入部34に締め代をもって密着する。つまり、接続部28に保持されたシール部材13に、挿入部34が適正に挿入されると、図3に示すシール部材13の内周側の一端側円筒面部102、凸面部103、中間円筒面部104、凸面部105および他端側円筒面部106が、締め代をもって、図4に示す挿入部34の主円筒面部118に当接する。このとき、シール部材13の外周側のシール筒部70は、接続部28の中径部39および大径部40に締め代をもって当接する。   Then, as shown in FIG. 5C, when the flange portion 114 exceeds the seal member 13, the seal member 13 comes into close contact with the insertion portion 34 with a margin. That is, when the insertion portion 34 is properly inserted into the seal member 13 held by the connection portion 28, the one end side cylindrical surface portion 102, the convex surface portion 103, and the intermediate cylindrical surface portion on the inner peripheral side of the seal member 13 shown in FIG. 104, the convex surface part 105, and the other end side cylindrical surface part 106 contact | abut to the main cylindrical surface part 118 of the insertion part 34 shown in FIG. At this time, the seal cylinder portion 70 on the outer peripheral side of the seal member 13 abuts on the intermediate diameter portion 39 and the large diameter portion 40 of the connection portion 28 with tightening allowance.

また、このとき、図5(c)に示すように、シール部材13の基端部68がリザーバ本体31の収容凹部110に収容される。つまり、図3に示すシール部材13の大径端面63が、図4に示す収容凹部110の根元面部111に当接し、図3に示すシール部材13の一端側円筒面部73が、図4に示す収容凹部110の円筒面部112に当接する。   At this time, as shown in FIG. 5C, the base end portion 68 of the seal member 13 is accommodated in the accommodating recess 110 of the reservoir body 31. That is, the large-diameter end surface 63 of the seal member 13 shown in FIG. 3 abuts on the root surface portion 111 of the housing recess 110 shown in FIG. 4, and the one end side cylindrical surface portion 73 of the seal member 13 shown in FIG. It contacts the cylindrical surface portion 112 of the housing recess 110.

また、このとき、図5(c)に示すように、鍔部114が、シール部材13の小径端面54から離間して、接続部28の小径部41に軸方向位置を重ね合わせて径方向に対向する。言い換えれば、接続部28の小径部41は、鍔部114に対向可能な位置に設けられている。なお、鍔部114の位置は、基端部68の変形量や挿入部34のシール部材13への挿入位置によって前後し、位置によっては、接続部28の小径部41の基端側円筒面部58に径方向に対向しない状態となる可能性があるが、少なくとも基端部68を収容凹部110と接続部28とで圧縮するまで挿入部34を挿入すれば、鍔部114が接続部28の基端側円筒面部58に軸方向位置を重ね合わせて径方向に対向する状態となることが可能となるように設定されている。   At this time, as shown in FIG. 5C, the flange 114 is separated from the small-diameter end surface 54 of the seal member 13 and overlaps the small-diameter portion 41 of the connecting portion 28 in the radial direction. opposite. In other words, the small-diameter portion 41 of the connection portion 28 is provided at a position that can face the flange portion 114. Note that the position of the flange 114 varies depending on the deformation amount of the base end portion 68 and the insertion position of the insertion portion 34 into the seal member 13, and depending on the position, the base end side cylindrical surface portion 58 of the small diameter portion 41 of the connection portion 28. However, if the insertion portion 34 is inserted until at least the base end portion 68 is compressed by the housing recess 110 and the connection portion 28, the flange portion 114 becomes the base of the connection portion 28. The end side cylindrical surface portion 58 is set so as to be able to be in a state of being opposed in the radial direction by overlapping the axial position.

ここで、上記した特許文献1に記載の技術では、マスタシリンダ本体の接続部(ボス部)の先端に内径側に突出する爪部を設け、シール部材に外径側に突出して爪部の軸方向内側に係止される筒状部を設けるとともに、リザーバの挿入部(接続脚部)の先端部に外径側へ拡がる鍔部を設けて、この鍔部をシール部材の軸方向内側に係止させる構造となっている。このような構造の場合、ボス部からの接続脚部の外れを規制するためには、鍔部の延出量を大きくする必要があるが、鍔部の延出量を大きくすると、ボス部の内周面に接触するシール部材を大きく変形させる必要があり、マスタシリンダ本体へのリザーバの組み付け性が低下、ひいては、製造効率が低下してしまうことになる。このため、特許文献1に記載の技術では、鍔部を偏心させることで、特に作動液の真空充填時の外れを規制しつつ、組み付け性の改善を図るようになっている。しかしながら、特許文献1に記載の技術では、ボス部からの接続脚部の外れを十分に規制することができるとは言えなかった。他方で、組み付け性の改善を図りつつボス部からの接続脚部の外れを規制するために、マスタシリンダ本体に対してリザーバをピンで連結することにより、マスタシリンダ本体に対してリザーバを保持することが行われているが、ピンを用いると、部品点数が増大し、組み付け工数が増大してしまう。   Here, in the technique described in Patent Document 1 described above, a claw portion that protrudes toward the inner diameter side is provided at the tip of the connection portion (boss portion) of the master cylinder body, and the shaft of the claw portion protrudes toward the outer diameter side from the seal member. A cylindrical portion that is locked inward in the direction is provided, and a flange portion that extends toward the outer diameter side is provided at the distal end portion of the insertion portion (connection leg portion) of the reservoir, and the flange portion is engaged in the axially inner side of the seal member. It has a structure to stop. In such a structure, in order to restrict the disengagement of the connecting leg portion from the boss portion, it is necessary to increase the extension amount of the flange portion. However, if the extension amount of the flange portion is increased, the boss portion The seal member in contact with the inner peripheral surface needs to be greatly deformed, so that the assembling property of the reservoir to the master cylinder main body is lowered, and as a result, the manufacturing efficiency is lowered. For this reason, the technique described in Patent Document 1 is designed to improve the assembling property while regulating the detachment at the time of vacuum filling of the working fluid by decentering the collar portion. However, in the technique described in Patent Document 1, it cannot be said that the disconnection of the connecting leg portion from the boss portion can be sufficiently restricted. On the other hand, the reservoir is held against the master cylinder body by connecting the reservoir to the master cylinder body with a pin in order to restrict the disengagement of the connecting leg from the boss portion while improving the assemblability. However, if pins are used, the number of parts increases and the number of assembling steps increases.

これに対して、第1実施形態のマスタシリンダは、マスタシリンダ本体11の接続部28に、嵌合凸部38の基端側にこれより大径の中径部39が設けられ、この中径部39の基端側に、この中径部39より大径の大径部40を設けられている。これにより、接続部28の中径部39で係止されているシール部材13に、リザーバ本体31の挿入部34の径方向外側に延びる鍔部114を嵌合させる際に、シール部材13が鍔部114で押圧されると、大径部40がシール部材13の径方向へのより大きな変形を許容することになる。これにより、シール部材13の挿入部34への摺動抵抗を弱めることになる。また、シール部材13の鍔部114で押されることにより外側に変形した部分が大径部40に収まることになるため、鍔部114の抵抗となる挿入方向前方へのはみ出し量を抑制することになり、この点からも鍔部114への摺動抵抗を弱めることになる。よって、鍔部114の径方向の延出量を大きくして作動液の充填時等に接続部28から挿入部34が外れてしまうことを規制しても、リザーバ12のシリンダ17への良好な組み付け性を得ることができ、製造効率の向上を図ることができる。したがって、リザーバ12とシリンダ17とをピンで連結する構造を採用することなく、接続部28にシール部材13を介して挿入部34を挿入することのみで連結する構造を採用しても、接続部28からの挿入部34の外れを規制することができる。   On the other hand, in the master cylinder of the first embodiment, the connecting portion 28 of the master cylinder body 11 is provided with a medium diameter portion 39 having a larger diameter on the proximal end side of the fitting convex portion 38. A large diameter portion 40 having a diameter larger than that of the medium diameter portion 39 is provided on the proximal end side of the portion 39. Thereby, when the flange 114 extending outward in the radial direction of the insertion portion 34 of the reservoir body 31 is fitted to the seal member 13 locked by the intermediate diameter portion 39 of the connection portion 28, the seal member 13 is When pressed by the portion 114, the large-diameter portion 40 allows a larger deformation in the radial direction of the seal member 13. Thereby, the sliding resistance to the insertion part 34 of the sealing member 13 is weakened. Moreover, since the part deform | transformed outside by being pushed by the collar part 114 of the sealing member 13 will be settled in the large diameter part 40, in order to suppress the protrusion amount to the insertion direction front used as resistance of the collar part 114 Thus, the sliding resistance to the flange 114 is weakened from this point as well. Therefore, even if the extension amount of the flange portion 114 in the radial direction is increased to restrict the insertion portion 34 from being detached from the connection portion 28 at the time of filling with the hydraulic fluid, the reservoir 12 can be satisfactorily applied to the cylinder 17. Assembling property can be obtained and the production efficiency can be improved. Therefore, even if a structure in which the reservoir 12 and the cylinder 17 are coupled by simply inserting the insertion portion 34 through the seal member 13 without adopting a structure in which the reservoir 12 and the cylinder 17 are coupled by a pin is employed. The detachment of the insertion portion 34 from the 28 can be restricted.

また、接続部28が、上記した大径部40のさらに基端側に、鍔部114に対向可能となるように、嵌合凸部38より小径の小径部41を有しているため、例え、シール部材13が鍔部114で想定以上に引っ張られることがあっても、鍔部114と小径部41との間に入り込むことを規制でき、シール部材13の損傷を抑制できる。   Further, the connecting portion 28 has a small-diameter portion 41 smaller in diameter than the fitting convex portion 38 so as to be able to face the flange portion 114 on the further proximal side of the large-diameter portion 40 described above. Even if the sealing member 13 is pulled more than expected at the flange portion 114, it can be prevented from entering between the flange portion 114 and the small diameter portion 41, and damage to the sealing member 13 can be suppressed.

また、接続部28の大径部40は、中径部39へ向けて徐々に縮径するテーパ面部53を有しているため、作動液の充填時に作動液の圧力により、リザーバ本体31の挿入部34が抜け方向に移動して、鍔部114がシール部材13の小径端面64に当接してシール部材13を抜け方向に押圧すると、シール筒部70がテーパ面部53の案内で径方向内側に移動するように変形し挿入部34との隙間を閉じ挿入部34への接触圧を高め摩擦力を高めることになる。これにより、挿入部34の接続部28からの抜けをさらに規制することができる。   Further, since the large-diameter portion 40 of the connection portion 28 has a tapered surface portion 53 that gradually decreases in diameter toward the medium-diameter portion 39, the reservoir main body 31 is inserted by the pressure of the hydraulic fluid when the hydraulic fluid is filled. When the portion 34 moves in the withdrawal direction and the flange portion 114 abuts against the small diameter end surface 64 of the seal member 13 and presses the seal member 13 in the withdrawal direction, the seal tube portion 70 is guided radially inward by the guide of the tapered surface portion 53. By deforming so as to move, the gap with the insertion portion 34 is closed, the contact pressure to the insertion portion 34 is increased, and the frictional force is increased. Thereby, the detachment | leave from the connection part 28 of the insertion part 34 can further be controlled.

「第2実施形態」
次に、第2実施形態のマスタシリンダを主に図6および図7に基づいて第1実施形態との相違部分を中心に説明する。なお、第1実施形態と共通する部位については、同一称呼、同一の符号で表す。
“Second Embodiment”
Next, the master cylinder of the second embodiment will be described mainly on the difference from the first embodiment based on FIGS. In addition, about the site | part which is common in 1st Embodiment, it represents with the same name and the same code | symbol.

第2実施形態においては、第1実施形態のシール部材13のシール筒部70に対して一部相違したシール筒部70Aを有するシール部材13Aが用いられている。第2実施形態のシール部材13Aは、第1実施形態のリブ86は設けられておらず、その外周面のシール筒部70Aの先端部にシール筒部70Aより大径、つまりリブ85よりも大径の円環状の突出部131が設けられている。つまり、シール筒部70Aは、リブ85の外表面を構成する凸面部88と、リブ87の外表面を構成する凸面部89と、突出部131の外表面を構成する、段面部132、湾曲面部133およびテーパ面部134を有している。   In the second embodiment, a seal member 13A having a seal cylinder portion 70A that is partially different from the seal cylinder portion 70 of the seal member 13 of the first embodiment is used. The seal member 13A of the second embodiment is not provided with the rib 86 of the first embodiment, and has a diameter larger than that of the seal cylinder part 70A at the tip of the seal cylinder part 70A on the outer peripheral surface, that is, larger than the rib 85. An annular protrusion 131 having a diameter is provided. That is, the seal cylinder portion 70A includes a convex surface portion 88 that forms the outer surface of the rib 85, a convex surface portion 89 that forms the outer surface of the rib 87, and a step surface portion 132 and a curved surface portion that form the outer surface of the protruding portion 131. 133 and a tapered surface portion 134.

段面部132は、凸面部88の小径端面64側の端縁部から軸直交方向に沿って径方向外側に広がる。湾曲面部133は、段面部132の大径側の端縁部から小径端面64側ほど大径となるように拡径した後、小径端面64側ほど小径となるように縮径しつつ、小径端面64側に延出する。湾曲面部133は、シール部材13Aの中心軸線を含む断面での断面形状が円弧状をなす。テーパ面部134は、湾曲面部133の小径端面64側の端縁部から小径端面64側ほど小径となるように縮径しつつ小径端面64側に延出して小径端面64に繋がる。   The stepped surface portion 132 extends radially outward from the end portion of the convex surface portion 88 on the small diameter end surface 64 side along the axis orthogonal direction. The curved surface portion 133 expands from the end portion on the large diameter side of the stepped surface portion 132 so as to increase in diameter toward the small diameter end surface 64 side, and then decreases in diameter so as to decrease in diameter toward the small diameter end surface 64 side. It extends to the 64 side. The curved surface portion 133 has an arc shape in cross section including the central axis of the seal member 13A. The tapered surface portion 134 extends to the small diameter end surface 64 side and is connected to the small diameter end surface 64 while reducing the diameter from the end portion on the small diameter end surface 64 side of the curved surface portion 133 to the smaller diameter end surface 64 side.

シール筒部70Aの最大外径つまり突出部131の最大外径は、接続部28の中径部39よりも大径となっている。また、突出部131の体積V1と、大径部40の内側のシール逃げ空間の容積をV2とすると、V1<V2に設定されている。さらに、基端部68の中間段面部76と突出部131の最大外径位置との間の軸方向長さは、接続部28の先端面35と大径部40の最大内径位置との間の軸方向長さよりも短くなっており、基端部68の中間段面部76と突出部131の段面部132との間の軸方向長さは、接続部28の先端面35と、中径部39と大径部40との境界位置との間の軸方向長さよりも短くなっている。つまり、シール筒部70Aの突出部131は、接続部28の中径部39と軸方向に位置が重なり合うようになっている。   The maximum outer diameter of the seal cylinder portion 70 </ b> A, that is, the maximum outer diameter of the protruding portion 131 is larger than the intermediate diameter portion 39 of the connection portion 28. Further, assuming that the volume V1 of the protruding portion 131 and the volume of the seal escape space inside the large diameter portion 40 are V2, V1 <V2. Further, the axial length between the intermediate step surface portion 76 of the base end portion 68 and the maximum outer diameter position of the protruding portion 131 is between the distal end surface 35 of the connection portion 28 and the maximum inner diameter position of the large diameter portion 40. The axial length between the intermediate step surface portion 76 of the base end portion 68 and the step surface portion 132 of the projecting portion 131 is shorter than the axial length. And the length in the axial direction between the boundary position of the large-diameter portion 40 is shorter. That is, the protruding portion 131 of the seal cylinder portion 70 </ b> A overlaps with the intermediate diameter portion 39 of the connecting portion 28 in the axial direction.

次に、接続部28とシール部材13Aと挿入部34との接合構造についてその接合手順に沿って説明する。   Next, the joining structure of the connection part 28, the sealing member 13A, and the insertion part 34 will be described along the joining procedure.

まず、図7(a)に示すように、接続部28にシール部材13Aが嵌合される。このとき、シール部材13Aは、そのシール筒部70Aの突出部131を接続部28の中径部39に当接させることになり、その嵌合凹部69に接続部28の嵌合凸部38を嵌合させ、その基端部68を接続部28の先端面35に当接させることになる。具体的に、図6に示すシール部材13Aの中間段面部76が、図2に示す接続部28の先端面35に当接し、図6に示すシール部材13Aの最小径円筒面部80が、図2に示す接続部28の先端側円筒面部45に当接し、図6に示すシール部材13の湾曲面部133が、図2に示す接続部28の中間円筒面部50に当接する。   First, as illustrated in FIG. 7A, the seal member 13 </ b> A is fitted to the connection portion 28. At this time, the seal member 13A causes the protruding portion 131 of the seal cylinder portion 70A to abut on the middle diameter portion 39 of the connecting portion 28, and the fitting convex portion 38 of the connecting portion 28 is placed in the fitting concave portion 69. The base end portion 68 is brought into contact with the distal end surface 35 of the connection portion 28 by fitting. Specifically, the intermediate step surface portion 76 of the seal member 13A shown in FIG. 6 abuts on the distal end surface 35 of the connection portion 28 shown in FIG. 2, and the minimum diameter cylindrical surface portion 80 of the seal member 13A shown in FIG. 6 is brought into contact with the front end side cylindrical surface portion 45 of the connecting portion 28, and the curved surface portion 133 of the sealing member 13 shown in FIG. 6 is brought into contact with the intermediate cylindrical surface portion 50 of the connecting portion 28 shown in FIG.

次に、図7(a)から図7(b)、さらに図7(c)、図7(d)に示すように、接続部28に保持されたシール部材13Aに、リザーバ本体の31の挿入部34が挿入される。このとき、まず、挿入部34は、図7(a)に示す先端側の鍔部114の先端テーパ面部122においてシール部材13Aの一端側湾曲面部101に当接し、その後、鍔部114の係止円筒面部121が、シール部材13Aの、一端側湾曲面部101、一端側円筒面部102、凸面部103、中間円筒面部104、凸面部105および他端側円筒面部106に順次接触し、これらの接触部分およびその近傍を径方向外側に押し潰し、かつ軸方向に引っ張りながら、嵌合する。すると、シール筒部70Aが、突出部131を主として大径部40内に配置するようにして、図7(b)に示すように中径部39および大径部40に嵌合する。その際に、シール部材13Aは、中径部39の前方の大径部40で突出部131を含むシール筒部70Aの径方向外側への変形がより許容されることになり、鍔部114への摺動抵抗を弱めることになる。また、シール部材13の鍔部114で押されることにより外側に変形した突出部131を含むシール筒部70Aが大径部40に収まることになるため、鍔部114の抵抗となる挿入方向前方へのはみ出し量を抑制することになり、この点からも鍔部114への摺動抵抗を弱めることになる。   Next, as shown in FIGS. 7A to 7B and FIGS. 7C and 7D, insertion of the reservoir body 31 into the seal member 13A held by the connecting portion 28 is performed. Part 34 is inserted. At this time, the insertion portion 34 first comes into contact with the one end side curved surface portion 101 of the seal member 13A at the distal end tapered surface portion 122 of the distal end flange portion 114 shown in FIG. The cylindrical surface portion 121 sequentially contacts the one end side curved surface portion 101, the one end side cylindrical surface portion 102, the convex surface portion 103, the intermediate cylindrical surface portion 104, the convex surface portion 105, and the other end side cylindrical surface portion 106 of the seal member 13A. And the vicinity thereof is crushed outward in the radial direction and fitted while being pulled in the axial direction. Then, the seal cylinder portion 70A is fitted to the medium diameter portion 39 and the large diameter portion 40 as shown in FIG. 7B so that the protruding portion 131 is mainly disposed in the large diameter portion 40. At that time, the seal member 13A is allowed to be deformed outwardly in the radial direction of the seal cylinder portion 70A including the protruding portion 131 at the large-diameter portion 40 in front of the medium-diameter portion 39. This will weaken the sliding resistance. Further, since the seal cylinder portion 70A including the protruding portion 131 deformed outward by being pushed by the flange portion 114 of the seal member 13 is accommodated in the large-diameter portion 40, forward in the insertion direction that becomes resistance of the flange portion 114. Therefore, the sliding resistance to the flange 114 is weakened from this point as well.

そして、鍔部114が、図7(c)に示すように、シール部材13Aを越えると、シール部材13Aは、挿入部34に締め代をもって密着する。接続部28に保持されたシール部材13Aに、挿入部34が適正に挿入されると、図6に示すシール部材13Aの一端側円筒面部102、凸面部103、中間円筒面部104、凸面部105および他端側円筒面部106が、締め代をもって、図4に示す挿入部34の主円筒面部118に当接する。このとき、図7(c)に示すように、シール筒部70Aは、接続部28の中径部39および大径部40に当接することになるが、図6に示す突出部131は、接続部28との上記した寸法関係から、その後の使用状態では、その少なくとも一部が中径部39に接触し、残りの一部が大径部40に接触する。つまり、組み付け時に収容凹部110と接続部28とで基端部68を圧縮し、一時的に突出部131の全体が大径部40に接触する状態となることがあっても、その後、基端部68が弾性力で戻ってリザーバ本体31の位置が落ち着いた使用状態において、突出部131は、少なくとも一部が中径部39に接触する状態になる。   Then, as shown in FIG. 7C, when the flange portion 114 exceeds the seal member 13 </ b> A, the seal member 13 </ b> A comes into close contact with the insertion portion 34 with a margin. When the insertion portion 34 is properly inserted into the seal member 13A held by the connecting portion 28, the one end side cylindrical surface portion 102, the convex surface portion 103, the intermediate cylindrical surface portion 104, the convex surface portion 105, and the seal member 13A shown in FIG. The other-end-side cylindrical surface portion 106 comes into contact with the main cylindrical surface portion 118 of the insertion portion 34 shown in FIG. At this time, as shown in FIG. 7C, the seal cylinder portion 70A comes into contact with the medium diameter portion 39 and the large diameter portion 40 of the connection portion 28, but the protrusion 131 shown in FIG. From the above-described dimensional relationship with the portion 28, at least a part thereof contacts the medium diameter part 39 and the remaining part contacts the large diameter part 40 in the subsequent use state. That is, even if the base end 68 is compressed by the housing recess 110 and the connection portion 28 during assembly, and the entire protrusion 131 may temporarily come into contact with the large-diameter portion 40, In a use state where the portion 68 is returned by the elastic force and the position of the reservoir main body 31 is settled, at least a part of the protruding portion 131 is in contact with the medium diameter portion 39.

第2実施形態のマスタシリンダによれば、シール部材13Aのシール筒部70Aの先端部にシール筒部70Aより大径の突出部131を設けたため、作動液の充填時に作動液の圧力により、リザーバ本体31の挿入部34が抜け方向に移動して、鍔部114がシール部材13Aの小径端面64に当接してシール部材13を抜け方向に押圧すると、突出部131を有するシール筒部70Aがテーパ面部53の案内で径方向内側に移動するように変形し挿入部34との隙間を閉じ挿入部34への接触圧を高め摩擦力を一層高めることになる。これにより、挿入部34の接続部28からの抜けを規制することができる。   According to the master cylinder of the second embodiment, the protrusion 131 having a diameter larger than that of the seal cylinder 70A is provided at the tip of the seal cylinder 70A of the seal member 13A. When the insertion portion 34 of the main body 31 moves in the withdrawal direction, and the collar portion 114 abuts against the small diameter end surface 64 of the seal member 13A and presses the seal member 13 in the withdrawal direction, the seal cylinder portion 70A having the protrusion 131 is tapered. It is deformed so as to move inward in the radial direction by the guide of the surface portion 53, closes the gap with the insertion portion 34, increases the contact pressure to the insertion portion 34, and further increases the frictional force. Thereby, the removal of the insertion portion 34 from the connection portion 28 can be restricted.

また、突出部131の少なくとも一部が、使用状態で接続部28の中径部39に接触するように設けられているため、シール部材13Aは中径部39から径方向内方、つまり挿入部34へ接触する方向に常に押圧される。これにより、シール部材13Aが使用状態で挿入部34を押圧することになり、使用状態での挿入部34の接続部28からの抜けを規制することができる。   Further, since at least a part of the projecting portion 131 is provided in contact with the intermediate diameter portion 39 of the connection portion 28 in use, the seal member 13A is radially inward from the intermediate diameter portion 39, that is, the insertion portion. 34 is always pressed in the direction of contact. As a result, the seal member 13A presses the insertion portion 34 in the use state, and the removal of the insertion portion 34 from the connection portion 28 in the use state can be restricted.

「第3実施形態」
次に、第3実施形態のマスタシリンダを主に図8および図9に基づいて第1実施形態との相違部分を中心に説明する。なお、第1実施形態と共通する部位については、同一称呼、同一の符号で表す。
“Third Embodiment”
Next, the master cylinder of the third embodiment will be described mainly on the difference from the first embodiment based on FIGS. 8 and 9. In addition, about the site | part which is common in 1st Embodiment, it represents with the same name and the same code | symbol.

第3実施形態においては、第1実施形態の接続部28に対して一部相違した大径部40Bおよび小径部41Bを有する接続部28Bが用いられている。第3実施形態の接続部28Bの大径部40Bおよび小径部41Bは、第1実施形態のテーパ面部55にかえて、湾曲面部141を有している。   In 3rd Embodiment, the connection part 28B which has the large diameter part 40B and the small diameter part 41B which were partly different with respect to the connection part 28 of 1st Embodiment is used. The large-diameter portion 40B and the small-diameter portion 41B of the connection portion 28B of the third embodiment have a curved surface portion 141 instead of the tapered surface portion 55 of the first embodiment.

湾曲面部141は、湾曲面部54の筒部16側の端縁部から筒部16側ほど小径となる円弧状をなして筒部16側に延出し、接続穴29の中心軸線を含む断面での断面形状が円弧状をなす。湾曲面部141は、その曲率半径が湾曲面部54の曲率半径よりも大きく、湾曲面部54から離れるほど曲率半径が大きくなる形状をなしている。湾曲面部141は、基端側円筒面部58に繋がる部分が、接続穴29の軸直交方向に沿っている。言い換えれば、湾曲面部141は、基端側円筒面部58に直交するように繋がっている。   The curved surface portion 141 extends in an arc shape having a smaller diameter from the edge portion on the tubular portion 16 side of the curved surface portion 54 toward the tubular portion 16 side, and is a cross section including the central axis of the connection hole 29. The cross-sectional shape is arcuate. The curved surface portion 141 has a shape in which the radius of curvature is larger than the radius of curvature of the curved surface portion 54 and the radius of curvature increases as the distance from the curved surface portion 54 increases. In the curved surface portion 141, the portion connected to the proximal end cylindrical surface portion 58 is along the direction orthogonal to the axis of the connection hole 29. In other words, the curved surface portion 141 is connected to be orthogonal to the proximal-end-side cylindrical surface portion 58.

次に、接続部28Bとシール部材13と挿入部34との接合構造についてその接合手順に沿って説明する。   Next, the joining structure of the connecting portion 28B, the seal member 13, and the insertion portion 34 will be described along the joining procedure.

まず、第1実施形態と同様、接続部28Bにシール部材13が嵌合される。このとき、シール部材13は、図9(a)に示すように、そのシール筒部70を中径部39および大径部40Bに当接させることになる。   First, as in the first embodiment, the seal member 13 is fitted into the connection portion 28B. At this time, as shown in FIG. 9A, the seal member 13 brings the seal cylinder part 70 into contact with the medium diameter part 39 and the large diameter part 40B.

次に、図9(a)から図9(b)に示すように、第1実施形態と同様に、接続部28Bに保持されたシール部材13に、リザーバ本体の31の挿入部34が挿入される。その際に、挿入部34の鍔部114がシール部材13を想定以上に引っ張ることがあっても、基端側円筒面部58に対し直交するように湾曲する湾曲面部141がシール部材13に当接して、鍔部114と小径部41Bの基端側円筒面部58との間に入り込むことを規制する。   Next, as shown in FIGS. 9A to 9B, the insertion portion 34 of the reservoir main body 31 is inserted into the seal member 13 held by the connection portion 28B, as in the first embodiment. The At this time, even if the flange portion 114 of the insertion portion 34 pulls the seal member 13 more than expected, the curved surface portion 141 that curves so as to be orthogonal to the proximal-side cylindrical surface portion 58 abuts against the seal member 13. Thus, the entry between the flange portion 114 and the proximal end side cylindrical surface portion 58 of the small diameter portion 41B is restricted.

以上の第3実施形態のマスタシリンダによれば、小径部41Bの大径部40B側の湾曲面部141が基端側円筒面部58に直交するように繋がるため、組み付け時に、例えシール部材13が鍔部114で想定以上に引っ張られることがあっても、この部分が鍔部114と小径部41Bとの間に入り込むことをさらに規制でき、シール部材13の損傷を一層抑制できる。   According to the master cylinder of the third embodiment described above, the curved surface portion 141 on the large-diameter portion 40B side of the small-diameter portion 41B is connected so as to be orthogonal to the base-end-side cylindrical surface portion 58. Even if the portion 114 is pulled more than expected, it can be further restricted that this portion enters between the flange portion 114 and the small diameter portion 41B, and damage to the seal member 13 can be further suppressed.

以上に述べた実施形態によれば、ピストンが摺動し圧力を発生するシリンダと、前記シリンダに作動流体を供給するリザーバと、前記シリンダに設けられ前記リザーバを接続する筒状の接続部と、前記リザーバに設けられ前記接続部に挿入される筒状の挿入部と、前記接続部と前記挿入部との間に設けられ、弾性を有してこれら接続部および挿入部間をシールする筒状のシール部材と、からなるマスタシリンダにおいて、前記挿入部は、先端側に径方向外側へ拡がる鍔部を有し、前記接続部は、その内周面の先端側に設けられ前記鍔部の外径より大径の環状の第1内径部と、該第1内径部の基端側に設けられ該第1内径部より大径の第2内径部と、該第2内径部の基端側にあって該第2内径部より大径の第3内径部とを有し、前記シール部材は、前記接続部の先端面に当接する大径の基端部と、前記接続部の第1内径部が嵌合する環状の嵌合部と、該嵌合部における前記基端部と軸方向反対側の位置に設けられ前記挿入部と前記接続部の第2内径部とに当接するシール筒部とを有する。これにより、シール部材の挿入部への摺動抵抗を弱めることになる。よって、鍔部の径方向の延出量を大きくして挿入部の接続部からの外れを規制しても、良好な組み付け性を得ることができる。また、接続部が、大径部のさらに基端側に、鍔部に対向可能となるように、嵌合凸部より小径の小径部を有しているため、例えシール部材が鍔部で想定以上に引っ張られることがあっても、この部分が鍔部と小径部との間に入り込むことを規制でき、シール部材の損傷を抑制できる。   According to the embodiment described above, a cylinder in which a piston slides to generate pressure, a reservoir that supplies a working fluid to the cylinder, a cylindrical connecting portion that is provided in the cylinder and connects the reservoir, A cylindrical insertion portion provided in the reservoir and inserted into the connection portion, and a cylindrical shape provided between the connection portion and the insertion portion and having elasticity to seal between the connection portion and the insertion portion The insertion portion has a flange portion that expands radially outward on the distal end side, and the connection portion is provided on the distal end side of the inner peripheral surface of the master cylinder. An annular first inner diameter portion having a diameter larger than the diameter, a second inner diameter portion provided on the proximal end side of the first inner diameter portion and having a larger diameter than the first inner diameter portion, and a proximal end side of the second inner diameter portion A sealing member having a third inner diameter portion larger than the second inner diameter portion. , A large-diameter base end contacting the front end surface of the connection part, an annular fitting part into which the first inner diameter part of the connection part fits, and the base end part of the fitting part opposite to the base end part in the axial direction A sealing cylinder portion provided at a position on the side and abutting against the insertion portion and a second inner diameter portion of the connection portion. Thereby, the sliding resistance to the insertion part of a seal member is weakened. Therefore, even if the amount of extension in the radial direction of the flange portion is increased and the disengagement of the insertion portion from the connection portion is restricted, good assemblability can be obtained. Further, since the connecting portion has a small diameter portion smaller than the fitting convex portion on the proximal end side of the large diameter portion so as to be able to face the flange portion, for example, the sealing member is assumed to be the flange portion. Even if it is pulled as described above, this portion can be prevented from entering between the flange portion and the small diameter portion, and damage to the seal member can be suppressed.

また、前記シール部材は、その外周面に、前記シール筒部の先端部に該シール筒部より大径の突出部を設けたため、挿入部の接続部からの外れを規制できる。   Moreover, since the said sealing member provided the protrusion part larger diameter than this seal | sticker cylinder part in the front-end | tip part of the said seal | sticker cylinder part on the outer peripheral surface, it can control | release the insertion part from the connection part.

また、前記接続部の前記第3内径部は、前記第2内径部へ向けて徐々に縮径する縮径部を有するため、挿入部が接続部に対し抜け方向に移動して、鍔部がシール部材を抜け方向に押圧すると、シール部材が縮径部の案内で径方向内側に移動するように変形し挿入部への接触圧を高め摩擦力を高めることになる。これにより、挿入部の接続部からの抜けを規制することができる。   Further, since the third inner diameter portion of the connection portion has a reduced diameter portion that gradually decreases in diameter toward the second inner diameter portion, the insertion portion moves in the removal direction with respect to the connection portion, and the flange portion When the seal member is pressed in the withdrawal direction, the seal member is deformed so as to move inward in the radial direction by the guide of the reduced diameter portion, increasing the contact pressure to the insertion portion and increasing the frictional force. As a result, it is possible to regulate the removal of the insertion portion from the connection portion.

また、前記突出部の少なくとも一部が、使用状態で前記第2内径部に接触するように設けられているため、シール部材が使用状態で挿入部を押圧することになり、使用状態での挿入部の接続部からの抜けを規制することができる。
なお、上記各実施の形態では、マスタシリンダの接続部28にシール部材13とリザーバの挿入部34とを接続するだけで、抜け止めを行うものを示したが、特許文献1のようなピン等によってマスタシリンダとリザーバを締結するマスタシリンダに本願発明を適用しても良い。これにより、仮に、メンテナンス時等にピン等の挿入を忘れても、マスタシリンダからリザーバが抜けてしまうことを防止できる。
In addition, since at least a part of the projecting portion is provided so as to contact the second inner diameter portion in use, the seal member presses the insertion portion in use, and insertion in use The part can be prevented from coming off from the connection part.
In each of the above-described embodiments, it has been shown that the seal member 13 and the reservoir insertion portion 34 are simply connected to the connection portion 28 of the master cylinder to prevent it from coming off. The present invention may be applied to a master cylinder that fastens the master cylinder and the reservoir. Thereby, even if it is forgotten to insert a pin or the like during maintenance or the like, it is possible to prevent the reservoir from coming off from the master cylinder.

12 リザーバ
13,13A シール部材
17 シリンダ
21,22 ピストン
28,28B 接続部
34 挿入部
35 先端面
38 嵌合凸部
39 中径部
40,40B 大径部
41,41B 小径部
53 テーパ面部(縮径部)
68 基端部
69 嵌合凹部
70,70A シール筒部
114 鍔部
131 突出部
12 Reservoir 13, 13A Seal member 17 Cylinder 21, 22 Piston 28, 28B Connection part 34 Insertion part 35 Tip face 38 Fitting convex part 39 Medium diameter part 40, 40B Large diameter part 41, 41B Small diameter part 53 Tapered surface part (reduced diameter) Part)
68 Base end portion 69 Fitting recess 70, 70A Seal cylinder portion 114 Gutter portion 131 Projection portion

Claims (5)

ピストンが摺動し圧力を発生するシリンダと、
前記シリンダに作動流体を供給するリザーバと、
前記シリンダに設けられ前記リザーバを接続する筒状の接続部と、
前記リザーバに設けられ前記接続部に挿入される筒状の挿入部と、
前記接続部と前記挿入部との間に設けられ、弾性を有してこれら接続部および挿入部間をシールする筒状のシール部材と、
からなるマスタシリンダにおいて、
前記挿入部は、先端側に径方向外側へ拡がる鍔部を有し、
前記接続部は、
その内周面の先端側に設けられ前記鍔部の外径より大径の環状の第1内径部と、該第1内径部の基端側に設けられ該第1内径部より大径の第2内径部と、該第2内径部の基端側にあって該第2内径部より大径の第3内径部とを有し、
前記シール部材は、前記接続部の先端面に当接する大径の基端部と、前記接続部の第1内径部が嵌合する環状の嵌合部と、該嵌合部における前記基端部と軸方向反対側の位置に設けられ前記挿入部と前記接続部の第2内径部とに当接するシール筒部とを有することを特徴とするマスタシリンダ。
A cylinder that slides and generates pressure;
A reservoir for supplying a working fluid to the cylinder;
A cylindrical connecting portion provided in the cylinder for connecting the reservoir;
A cylindrical insertion portion provided in the reservoir and inserted into the connection portion;
A cylindrical seal member provided between the connection portion and the insertion portion and having elasticity to seal between the connection portion and the insertion portion;
In the master cylinder consisting of
The insertion portion has a flange portion that extends radially outward on the distal end side,
The connecting portion is
An annular first inner diameter portion provided on the distal end side of the inner peripheral surface and having a larger diameter than the outer diameter of the flange portion, and a first inner diameter portion provided on the proximal end side of the first inner diameter portion and having a larger diameter than the first inner diameter portion. A second inner diameter portion and a third inner diameter portion on the proximal end side of the second inner diameter portion and having a larger diameter than the second inner diameter portion;
The sealing member includes a large-diameter base end that contacts the front end surface of the connection portion, an annular fitting portion that fits the first inner diameter portion of the connection portion, and the base end portion in the fitting portion. And a seal cylinder portion which is provided at a position opposite to the axial direction and abuts against the insertion portion and the second inner diameter portion of the connection portion.
前記シール部材は、その外周面に、前記シール筒部の先端部に該シール筒部より大径の突出部を設けたことを特徴とする請求項1に記載のマスタシリンダ。   2. The master cylinder according to claim 1, wherein the seal member is provided with a projecting portion having a diameter larger than that of the seal tube portion at a distal end portion of the seal tube portion on an outer peripheral surface thereof. 前記接続部の前記第3内径部は、前記第2内径部へ向けて徐々に縮径する縮径部を有することを特徴とする請求項1または2に記載のマスタシリンダ。   3. The master cylinder according to claim 1, wherein the third inner diameter portion of the connection portion has a reduced diameter portion that gradually decreases in diameter toward the second inner diameter portion. 前記突出部の少なくとも一部が、使用状態で前記第2内径部に接触するように設けられていることを特徴とする請求項1乃至3のいずれか一項に記載のマスタシリンダ。   4. The master cylinder according to claim 1, wherein at least a part of the projecting portion is provided so as to contact the second inner diameter portion in a use state. 5. 前記接続部は、前記第3内径部の基端側にあって前記鍔部に対向可能な位置に設けられ前記第1内径部より小径の第4内径部を有することを特徴とする請求項1乃至4のいずれか一項に記載のマスタシリンダ。   2. The connecting portion according to claim 1, further comprising a fourth inner diameter portion that is provided at a position on the proximal end side of the third inner diameter portion so as to face the flange portion and has a smaller diameter than the first inner diameter portion. The master cylinder as described in any one of thru | or 4.
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