JP5802466B2 - Master cylinder - Google Patents

Description

  The present invention relates to a master cylinder that supplies hydraulic pressure to a wheel cylinder of a vehicle.

  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).

JP 2001-158337 A

  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.

  Therefore, an object of the present invention is to improve the manufacturing efficiency of the master cylinder.

  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.

  According to the present invention, the manufacturing efficiency of the master cylinder can be improved.

It is the side view which made the principal part which shows the master cylinder of 1st Embodiment a cross section. It is a partial expanded sectional view which shows the connection part of the master cylinder of 1st Embodiment. The sealing member of the master cylinder of 1st Embodiment is shown, (a) is sectional drawing, (b) is a front view. It is a partial expanded sectional view which shows the insertion part of the master cylinder of 1st Embodiment. 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). The sealing member of the master cylinder of 2nd Embodiment is shown, (a) is sectional drawing, (b) is a front view. 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). It is a partial expanded sectional view which shows the connection part of the master cylinder of 3rd Embodiment. 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).

  Hereinafter, the master cylinder of each embodiment of the present invention will be described.

“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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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. .

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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, and the chamfering is performed. The diameter is larger than the outer diameter of the surface 60.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  Next, the joining structure of the connection part 28, the sealing member 13, and the insertion part 34 is demonstrated along the joining procedure.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

“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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

“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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

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 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 (4)

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 provided in a position axially opposite possess and said insertion portion and the second inner diameter section and the abutting tubular sealing portion of the connecting portion,
Wherein the connecting portion the third inner diameter portion, the master cylinder, characterized in that to have a reduced diameter portion gradually reduced in diameter toward the second inner diameter portion.   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. 3. The master cylinder according to claim 2, wherein at least a part of the protruding portion is provided so as to contact the second inner diameter portion in use. 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 3 .

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