JP5113499B2

JP5113499B2 - Clamp sleeve and indexing device clamping device

Info

Publication number: JP5113499B2
Application number: JP2007303152A
Authority: JP
Inventors: 好教辰田
Original assignee: Tsudakoma Industrial Co Ltd
Current assignee: Tsudakoma Corp
Priority date: 2007-11-22
Filing date: 2007-11-22
Publication date: 2013-01-09
Anticipated expiration: 2027-11-22
Also published as: TW200924901A; TWI430866B; KR20090053678A; CN101439482B; JP2009125858A; CN101439482A

Description

本発明は、工作機械に用いられる割出装置のクランプ装置、およびそのクランプ装置の一部として用いるクランプスリーブに関する。 The present invention relates to a clamp device for an indexing device used in a machine tool, and a clamp sleeve used as a part of the clamp device.

従来の割出装置として、中央貫通孔を有するベース（フレーム）と、ベースの内側に回転体が回転可能に支持されるテーブルと、テーブルの外側回転軸とベースとの間に介在するクランプ装置とからなるものがある（特許文献１）。
特開２００２−１０３１８１号公報 As a conventional indexing device, a base (frame) having a central through hole, a table in which a rotating body is rotatably supported inside the base, and a clamp device interposed between the outer rotating shaft of the table and the base (Patent Document 1).
JP 2002-103181 A

このクランプ装置は、クランプ部材（クランプスリーブ）と、クランプ部材を変形させる油圧回路（変形力発生手段）から構成してある。クランプ部材は、薄肉部のクランプ部を有する断面コ字状をし、クランプ部の外側に環状の油圧室を形成するものである。クランプ部材は、クランプ部が筒状であってその内面を摩擦面とすることから、クランプ時には油圧室に油圧をかけてクランプ部をたわませて外側回転軸を挟持するものである。 This clamp device is composed of a clamp member (clamp sleeve) and a hydraulic circuit (deformation force generating means) for deforming the clamp member. The clamp member has a U-shaped cross section having a thin-walled clamp portion, and forms an annular hydraulic chamber outside the clamp portion. The clamp member has a cylindrical clamp portion and its inner surface is a friction surface. Therefore, during clamping, hydraulic pressure is applied to the hydraulic chamber to deflect the clamp portion and pinch the outer rotation shaft.

ところが、クランプ部は、その内面を外側回転軸に摩擦させ、その摩擦によって挟持するものであるので、使用しているうちに薄肉のクランプ部の疲労が進み亀裂が生じることがある。そうすると、クランプ部はその外側の油圧室に油圧をかけることによってクランプするものであることから、亀裂箇所から油が漏れ、それに伴って摩擦力が急激に低下し、クランプ力を充分に得られないものとなる。 However, since the clamp portion rubs the inner surface against the outer rotation shaft and is clamped by the friction, fatigue of the thin clamp portion may progress and cracks may occur during use. Then, since the clamp part is clamped by applying hydraulic pressure to the outer hydraulic chamber, oil leaks from the cracked part, and the frictional force rapidly decreases accordingly, and the clamping force cannot be obtained sufficiently. It will be a thing.

本発明は上記実情を考慮して開発されたもので、その解決課題はたとえクランプ部に亀裂が生じてもクランプ力を持続できるクランプスリーブおよびクランプ装置を提供することである。 The present invention has been developed in view of the above circumstances, and a problem to be solved is to provide a clamp sleeve and a clamp device that can maintain a clamping force even if a crack occurs in the clamp portion.

本発明の請求項１〜６は、回転体とフレームとの間の環状空間に配置される円筒部と、円筒部の内周部または外周部のうち回転体の軸方向に延びる環状面であると共に軸線方向に平行である被クランプ面に対向する周部に設けられるクランプ面と、クランプ面が設けられる円筒部の周部とは反対側の周部に円周方向に沿って連続して設けられる環状溝と、クランプ面と環状溝の底面とで画定される薄肉部と、円筒部の一端部に設けられるフレームへの固定部とを有するクランプスリーブを前提とする。
Claims 1 to 6 of the present invention are a cylindrical portion disposed in an annular space between the rotating body and the frame, and an annular surface extending in the axial direction of the rotating body among the inner peripheral portion or the outer peripheral portion of the cylindrical portion. In addition, a clamp surface provided in a peripheral portion facing the surface to be clamped parallel to the axial direction and a peripheral portion on the opposite side of the peripheral portion of the cylindrical portion in which the clamp surface is provided are continuously provided along the circumferential direction. And a clamp sleeve having an annular groove, a thin portion defined by a clamp surface and a bottom surface of the annular groove, and a fixing portion to a frame provided at one end of the cylindrical portion.

請求項１の発明は、円筒部の他端部には、軸線方向に加わる圧縮方向または引張り方向の力を受ける変形力作用部が設けられ、薄肉部は、前記軸線方向の断面における肉厚の中間点の軌跡である軸線方向全域の中間線が、第一条件を満たす形状をなすように形成され、該第一条件は、前記中間線を軸線方向に５等分する５つの領域に分け、５つの領域を中央から端に向かって中央領域、中間領域、端部領域とし、各領域内の中間線を回転体半径方向で平均した平均軌跡と回転体の被クランプ面との距離が中央領域、中間領域、端部領域の順に大きくなる、であることを特徴とする。
In the first aspect of the invention, the other end portion of the cylindrical portion is provided with a deforming force acting portion that receives a force in the compression direction or the tensile direction applied in the axial direction, and the thin-walled portion has a thickness in a cross section in the axial direction. the middle line of the axial entire region is the locus of the midpoint is formed so as to form a first condition is satisfied shape, the first condition is divided into five regions for 5 equally dividing the intermediate line in the axial direction, The five regions are the center region, the intermediate region, and the end region from the center to the end, and the distance between the average locus obtained by averaging the intermediate lines in each region in the radial direction of the rotating body and the clamped surface of the rotating body is the central region. characterized in that the intermediate region becomes larger in the order of the end region is.

薄肉部は、５つの領域の中間線の回転体半径方向における変化量が、全領域で均一に形成されるもの等で、軸線方向全域の中間線を形成するものであってもよいが、薄肉部を変形させやすくするには、請求項２の発明のようにすることが望ましい。即ち、薄肉部は、軸線方向全域の中間線が、第二条件を満たす形状をなすように形成され、該第二条件は、５つの領域の中間線の回転体半径方向における変化量が、中央領域、中間領域、端部領域の順に大きくなる、である。
The thin portion may be one in which the amount of change in the radial direction of the intermediate line of the five regions is uniformly formed in the entire region, and may form an intermediate line in the entire axial direction. In order to facilitate the deformation of the portion, it is desirable to make it as in the invention of claim 2. That is, the thin portion, the middle line of the axial entire region, is formed so as to form a second condition is satisfied shape, the second condition, the change amount in the rotating body radial direction of the intermediate line of the five regions, the central It becomes larger in order of the area, the intermediate area, and the end area.

薄肉部の軸線方向全域の中間線は、角部を有する形態であっても良いが、変形時の応力が角部に集中しやすくなる。従って、応力集中を避け、耐久性を向上するには、請求項３の発明のようにすることが望ましい。即ち、薄肉部の軸線方向全域の中間線が、全体的に連続する曲線形状をなすように、環状溝の底面またはクランプ面が設けられることである。 The intermediate line in the entire axial direction of the thin wall portion may have a corner portion, but stress during deformation tends to concentrate on the corner portion. Therefore, in order to avoid stress concentration and improve durability, it is desirable to use the invention according to the third aspect. That is, the bottom surface or the clamp surface of the annular groove is provided so that the intermediate line in the entire axial direction of the thin portion has a continuous curved shape as a whole.

環状溝の底面は、平面であっても良いが、薄肉部を変形しやすくするには、請求項４の発明のように、環状溝の底面は、薄肉部の両端から中心に向かうにつれて、回転体の被クランプ面に近づくように設けられることが望ましい。 The bottom surface of the annular groove may be a flat surface, but in order to make it easier to deform the thin wall portion, the bottom surface of the annular groove rotates as it goes from both ends of the thin wall portion toward the center. It is desirable to be provided so as to approach the clamped surface of the body.

クランプ面は、平面であっても良いが、薄肉部を変形しやすくするには、請求項５の発明のように、クランプ面は、薄肉部の両端から中心に向かうにつれて、回転体の被クランプ面に近づくように設けられることが望ましい。 The clamp surface may be a flat surface. However, in order to easily deform the thin portion, the clamp surface is clamped by the rotating body as it goes from both ends of the thin portion toward the center. It is desirable to be provided so as to approach the surface.

薄肉部は、円筒部の円周方向全周に亘って連続する形態であってもよいが、変形し易くするには、請求項６の発明のように、薄肉部には、円周方向に間隔をおいてスリットが複数設けられることが望ましい。 The thin-walled portion may have a form that extends continuously over the entire circumference in the circumferential direction of the cylindrical portion. However, in order to facilitate deformation, the thin-walled portion has a circumferential direction as in the invention of claim 6. It is desirable to provide a plurality of slits at intervals.

また、本発明の請求項７、８の発明は、回転体とフレームとの間の環状空間に収容されるクランプスリーブと、クランプスリーブに力を作用させる変形力発生手段とからなり、クランプスリーブは、環状空間に配置される円筒部と、円筒部の内周部または外周部のうち回転体の軸方向に延びる環状面であると共に軸線方向に平行である被クランプ面に対向する周部に設けられるクランプ面と、クランプ面が設けられる円筒部の周部とは反対側の周部に円周方向に沿って連続して設けられる環状溝と、クランプ面と環状溝の底面とで画定される薄肉部と、円筒部の一端部に設けられるフレームへの固定部とを有する、割出装置のクランプ装置を前提とする。
The inventions of claims 7 and 8 of the present invention comprise a clamp sleeve accommodated in an annular space between the rotating body and the frame, and a deformation force generating means for applying a force to the clamp sleeve. A cylindrical portion disposed in the annular space, and an annular surface extending in the axial direction of the rotating body of the inner peripheral portion or the outer peripheral portion of the cylindrical portion and provided on the peripheral portion facing the clamped surface parallel to the axial direction A clamping surface, an annular groove continuously provided along a circumferential direction on a circumferential portion opposite to the circumferential portion of the cylindrical portion on which the clamping surface is provided, and a clamping surface and a bottom surface of the annular groove. Assume a clamp device for an indexing device having a thin portion and a fixing portion to a frame provided at one end of the cylindrical portion.

請求項７の発明は、クランプスリーブは、円筒部の他端部には、軸線方向に加わる引張り方向の力を受ける変形力作用部が設けられ、薄肉部は、前記軸線方向の断面における肉厚の中間点の軌跡である軸線方向全域の中間線が、第一条件を満たす形状をなすように形成され、該第一条件は、前記中間線を軸線方向に５等分する５つの領域に分け、５つの領域を中央から端に向かって中央領域、中間領域、端部領域とし、各領域内の中間線を回転体半径方向で平均した平均軌跡と回転体の被クランプ面との距離が中央領域、中間領域、端部領域の順に大きくなる、であり、クランプスリーブは、環状空間に収容された状態において、変形力発生手段を介し変形力作用部に引張り方向への所定量の力が加えられたとき、薄肉部のクランプ面が回転体の被クランプ面から離れる方向に後退して回転体をアンクランプ状態とし、変形力発生手段からの変形力作用部への力が解放されたときには、復元力によって薄肉部のクランプ面が回転体の被クランプ面を押圧する方向に進出して回転体をクランプ状態にすることを特徴とする。
According to a seventh aspect of the present invention, in the clamp sleeve, the other end portion of the cylindrical portion is provided with a deformation force acting portion that receives a force in the tensile direction applied in the axial direction, and the thin portion has a thickness in a cross section in the axial direction. the middle line of the axial entire region is the locus of the midpoint is formed so as to form a first condition is satisfied shape, the first condition is divided into five regions for 5 equally dividing the intermediate line in the axial direction The five areas are the center area, the intermediate area, and the end area from the center to the end, and the distance between the average trajectory obtained by averaging the intermediate lines in each area in the rotating body radial direction and the clamped surface of the rotating body is the center. region, intermediate region, increases in the order of the end region, a clamp sleeve is in a state of being accommodated in the annular space, a predetermined amount of force in the pulling direction to the deformation forces acting portion through the deformation force generating means added The clamp surface of the thin wall rotates. When the rotating body is retreated in the direction away from the clamped surface to put the rotating body in an unclamped state, and the force from the deformation force generating means to the deformation force acting part is released, the clamping surface of the thin part is It advances in the direction which presses a to-be-clamped surface, and makes a rotary body a clamp state, It is characterized by the above-mentioned.

請求項８の発明は、請求項７の発明とは逆の作用でクランプ、アンクランプするもので、即ち、クランプスリーブは、環状空間に収容された状態において、変形力発生手段を介し変形力作用部に圧縮方向への所定量の力が加えられたとき、薄肉部のクランプ面が回転体の被クランプ面に近づく方向に進出して回転体をクランプ状態とし、変形力発生手段からの変形力作用部への力が解放されたときには、復元力によって薄肉部のクランプ面が回転体の被クランプ面から離れる方向に後退して回転体をアンクランプ状態にすることを特徴とする。 The invention according to claim 8 clamps and unclamps by the reverse action of the invention according to claim 7, that is, the clamp sleeve is acted on by the deforming force via the deforming force generating means in the state of being accommodated in the annular space. When a predetermined amount of force in the compression direction is applied to the part, the clamping surface of the thin part advances in a direction approaching the clamped surface of the rotating body to bring the rotating body into a clamped state, and the deformation force from the deformation force generating means When the force to the action portion is released, the clamping surface of the thin portion is retracted in a direction away from the clamped surface of the rotating body by the restoring force, and the rotating body is in an unclamped state.

請求項１の発明は、円筒部の薄肉部の形状が第一条件を満たすものとしてあるので、円筒部の他端部に相当する変形力作用部に、軸線方向に圧縮方向または引張り方向の力を加えると、薄肉部の中間線の曲率が変わるように薄肉部が安定して変形し、薄肉部のクランプ面の径が安定して膨張または収縮することになり、このクランプスリーブを用いれば、円筒部の環状溝に油圧をかけなくても、回転体をクランプ、アンクランプさせることができる。従って、使用しているうちに薄肉部に亀裂が生じたとしてもある程度のクランプ力を持続でき、比較的に長い期間に亘って使用できる。 In the first aspect of the invention, since the shape of the thin portion of the cylindrical portion satisfies the first condition, a force in the compression direction or the tensile direction in the axial direction is applied to the deformation force acting portion corresponding to the other end portion of the cylindrical portion. Is added, the thin part is stably deformed so that the curvature of the intermediate line of the thin part is changed, and the diameter of the clamp surface of the thin part is stably expanded or contracted. The rotating body can be clamped and unclamped without applying hydraulic pressure to the annular groove of the cylindrical portion. Therefore, even if a crack occurs in the thin portion during use, a certain degree of clamping force can be maintained, and it can be used over a relatively long period.

請求項２の発明は、薄肉部の形状が第二条件を満たすものとしてあるので、薄肉部を変形させ易くなり、変形力作用部に加える力を軽くしてもクランプ、アンクランプさせることができる。 In the invention of claim 2, since the shape of the thin portion satisfies the second condition, the thin portion can be easily deformed and can be clamped and unclamped even if the force applied to the deformation force acting portion is lightened. .

請求項３の発明は、環状溝の底面またはクランプ面の形状によって薄肉部の軸線方向全域の中間線が全体的に連続する曲線形状をなすようにしてあるので、角部のあるものに比べて、クランプ時またはアンクランプ時に薄肉部の全体に変形力がかかるようになり、その結果、耐久性を向上できる。 In the invention of claim 3, the intermediate line in the whole axial direction of the thin portion is formed by a shape of the bottom surface or the clamp surface of the annular groove so as to form a curvilinear shape as a whole. The deformation force is applied to the entire thin portion during clamping or unclamping, and as a result, durability can be improved.

請求項４の発明は、薄肉部の両端から中心に向かうにつれて回転体の被クランプ面に近づくように環状溝の底面を設けてあるので、環状溝の底面を平面にした場合に比べて、薄肉部を変形させやすくなる。 In the invention of claim 4, since the bottom surface of the annular groove is provided so as to approach the clamped surface of the rotating body from the both ends of the thin portion toward the center, compared to the case where the bottom surface of the annular groove is flat, It becomes easy to deform the part.

請求項５の発明は、薄肉部の両端から中心に向かうにつれて、回転体の被クランプ面に近づくようにクランプ面を設けてあるので、クランプ面を平面にした場合に比べて、薄肉部を変形させやすくなる。 In the invention of claim 5, since the clamp surface is provided so as to approach the clamped surface of the rotating body from the both ends of the thin portion toward the center, the thin portion is deformed as compared with the case where the clamp surface is flat. It becomes easy to let you.

請求項６の発明は、円周方向に間隔をおいてスリットを複数設けた薄肉部を用いているので、スリットのないものに比べて、薄肉部を変形させやすくなる。 In the invention of claim 6, since the thin portion provided with a plurality of slits at intervals in the circumferential direction is used, the thin portion is easily deformed as compared with the case without the slit.

請求項７の発明は、請求項１のクランプスリーブのうち軸線方向に加わる引張り方向の力を受ける変形力作用部を円筒部の他端部に備えるものを用いているので、請求項１の発明の効果を保有しつつ、変形力作用部に引張り方向の力が加わるときに回転体をアンクランプ状態にすることができ、変形力作用部に加わる引張り方向の力を解放した定常状態のときには回転体をクランプ状態にできる。 Since the invention according to claim 7 uses the clamp sleeve of claim 1 provided with a deforming force acting portion that receives a force in the tensile direction applied in the axial direction at the other end of the cylindrical portion, the invention according to claim 1 is used. The rotating body can be in an unclamped state when a tensile force is applied to the deforming force acting part while maintaining the effect of Rotation in the steady state where the tensile force applied to the deforming force acting part is released. You can clamp your body.

請求項８の発明も、請求項７とは逆に、請求項１のクランプスリーブのうち軸線方向に加わる圧縮方向の力を受ける変形力作用部を円筒部の他端部に備えるものを用いているので、請求項１の発明の効果を保有しつつ、変形力作用部に圧縮方向の力が加わるときに回転体をクランプ状態にすることができ、変形力作用部に加わる圧縮方向の力を解放した定常状態のときには回転体をアンクランプ状態にできる。 In the invention of claim 8, contrary to claim 7, the clamp sleeve of claim 1 is provided with a deforming force acting portion that receives a force in the compression direction applied in the axial direction at the other end of the cylindrical portion. Therefore, while maintaining the effect of the invention of claim 1, the rotating body can be clamped when a force in the compression direction is applied to the deformation force acting portion, and the force in the compression direction applied to the deformation force acting portion can be reduced. When in the released steady state, the rotating body can be in an unclamped state.

割出装置１は、図１に示すインデックステーブル装置が一例として挙げられる。割出装置１は、フレーム２と、フレーム２に回転可能に支持される回転体３と、を有している。また、割出装置１は、フレーム２と回転体３の間に、軸受４、クランプ装置５、および回転駆動装置６を介在するものである。 An example of the indexing device 1 is the index table device shown in FIG. The indexing device 1 includes a frame 2 and a rotating body 3 that is rotatably supported by the frame 2. In addition, the indexing device 1 has a bearing 4, a clamp device 5, and a rotational drive device 6 interposed between the frame 2 and the rotating body 3.

フレーム２は、その内側に回転体３の一部（回転軸３ａ）を配置する収容室２ａを備え、回転軸３ａの外側を間隔をおいて囲むものである。収容室２ａは、貫通孔であって、内径がフランジ状に所々突出した段差形状である。 The frame 2 includes a housing chamber 2a in which a part of the rotating body 3 (rotating shaft 3a) is disposed, and surrounds the outer side of the rotating shaft 3a with a space therebetween. The storage chamber 2a is a through hole and has a stepped shape in which the inner diameter protrudes in a flange shape.

回転体３は、回転軸３ａと、回転軸３ａの一端（上端）にボルト等で固定する円テーブル３ｂとから構成してある。 The rotating body 3 includes a rotating shaft 3a and a circular table 3b fixed to one end (upper end) of the rotating shaft 3a with a bolt or the like.

回転軸３ａは、円筒状であって、外形がフランジ状に所々突出した段差形状である。また、回転軸３ａは、その内周面を軸用貫通孔３ｃとし、フレーム２の収容室２ａ内に同心円状に配置してある。 The rotating shaft 3a is cylindrical and has a step shape in which the outer shape protrudes in a flange shape. The rotary shaft 3 a has a shaft through hole 3 c on its inner peripheral surface, and is arranged concentrically in the housing chamber 2 a of the frame 2.

円テーブル３ｂは、工作機械で加工するワークを載せるものであって、回転軸３ａからフランジ状に突出する形状であって、軸用貫通孔３ｃに連続するテーブル用貫通孔３ｄを半径方向中央部に設けてある。 The circular table 3b mounts a workpiece to be machined with a machine tool, has a shape protruding in a flange shape from the rotary shaft 3a, and has a table through-hole 3d continuous with the shaft through-hole 3c in the radial center portion. Is provided.

フレーム２と回転軸３ａは、上述したように対向する周部を、所々フランジ状に突出することによって、両者の間に、複数の同心円状の空間部２１ａ、２１ｂ、２１ｃ、２１ｄを軸線方向に間隔をあけて形成してある。 As described above, the frame 2 and the rotating shaft 3a protrude in the form of flanges from each other so that a plurality of concentric space portions 21a, 21b, 21c, and 21d are disposed in the axial direction therebetween. They are formed at intervals.

図では、一番下側の空間部２１ａには、フレーム２の内周部にボルト等で固定する環状のプレート２２と、環状のプレート２２と回転軸３ａの間に嵌める環状のシール部材２３を、収容してある。 In the figure, in the lowermost space portion 21a, an annular plate 22 fixed to the inner peripheral portion of the frame 2 with a bolt or the like, and an annular seal member 23 fitted between the annular plate 22 and the rotary shaft 3a. Is housed.

下から二番目の空間部２１ｂは、回転駆動装置６を収容してある。回転駆動装置６は、ウォーム機構を用いたものであって、ウォームホイール６ａ、ウォームスピンドル６ｂ、図示しないサーボモータとから構成し、回転軸３ａの外側にウォームホイール６ａを固定し、ウォームホイール６ａの外側にウォームスピンドル６ｂを噛み合わせてある。また、回転軸３ａとウォームホイール６ａの軸線方向の間には、噛み合わせ調整用の間隙部材６ｃを介在してあり、適切な厚みの間隙部材６ｃを採用することによって、ウォームホイール６ａの軸線方向の位置を調整して、適切な噛み合わせ状態とする。なお、ウォームスピンドル６ｂには、図示しないサーボモータの出力軸が連結され、回転軸３ａ（円テーブル３ｂ）の割出角度は、サーボモータの駆動量によって制御される。 The second space portion 21b from the bottom accommodates the rotation driving device 6. The rotation drive device 6 uses a worm mechanism, and includes a worm wheel 6a, a worm spindle 6b, and a servo motor (not shown). The worm wheel 6a is fixed to the outside of the rotation shaft 3a, and the worm wheel 6a The worm spindle 6b is engaged with the outside. Further, a gap member 6c for adjusting meshing is interposed between the rotation shaft 3a and the worm wheel 6a in the axial direction, and by adopting a gap member 6c having an appropriate thickness, the axial direction of the worm wheel 6a. Adjust the position of to ensure proper meshing. An output shaft of a servo motor (not shown) is connected to the worm spindle 6b, and the indexing angle of the rotary shaft 3a (circular table 3b) is controlled by the drive amount of the servo motor.

下から三番目の空間部２１ｃは、軸受４を収容してある。軸受４は、具体的にはクロスローラベアリングであって、内輪４ａと外輪４ｂの間に図示しない、ころを配置したものである。符号４ｃは、外輪４ｂを固定するための押え板である。 The third space 21c from the bottom accommodates the bearing 4. Specifically, the bearing 4 is a cross roller bearing, and a roller (not shown) is disposed between the inner ring 4a and the outer ring 4b. Reference numeral 4c is a presser plate for fixing the outer ring 4b.

最後に残った一番上の空間部２１ｄは、クランプ装置５の第一例を収容してある。クランプ装置５の第一例は、一端部（図では上端部）をフレーム２に固定するクランプスリーブ７と、クランプスリーブ７の他端部（図では下端部）に軸方向に沿って力を付与して変形させる変形力発生手段８とから構成してある。一番上の空間部２１ｄは、その上側空間をクランプスリーブ７の収容空間とし、その下側空間を変形力発生手段８の収容空間としてある。 The last remaining uppermost space portion 21 d accommodates the first example of the clamp device 5. The first example of the clamp device 5 is to apply a force along the axial direction to the clamp sleeve 7 that fixes one end (upper end in the figure) to the frame 2 and the other end (lower end in the figure) of the clamp sleeve 7. And a deforming force generating means 8 for deforming. The uppermost space portion 21 d has an upper space as a storage space for the clamp sleeve 7 and a lower space as a storage space for the deformation force generating means 8.

変形力発生手段８は、フレーム２内に形成する流体用の流路８ａと、流路８ａの二次側端部のシリンダ室８ａ１に配置するピストン８ｂと、から構成してある。ピストン８ｂは、軸線方向の片側断面エ字状のリングであって、その底面に油圧室となる凹部８ｂ１を同心円状に形成し、内周部と外周部の溝にＯリング９を嵌めてある。Ｏリング９は、ピストン８ｂ以外の箇所にも使用してあり、油漏れを防いである。なお、シリンダ室８ａ１は、一番上の空間部２１ｄの下側空間に相当する。 The deformation force generating means 8 is composed of a fluid flow path 8a formed in the frame 2 and a piston 8b arranged in the cylinder chamber 8a1 at the secondary side end of the flow path 8a. The piston 8b is a ring with an E-shaped one-side cross section in the axial direction. A concave portion 8b1 serving as a hydraulic chamber is formed concentrically on the bottom surface of the piston 8b, and an O-ring 9 is fitted in the inner and outer grooves. . The O-ring 9 is also used in places other than the piston 8b and prevents oil leakage. The cylinder chamber 8a1 corresponds to the lower space of the uppermost space portion 21d.

クランプスリーブ７は、一番上の空間部２１ｄの上側空間（環状空間）に同心円状に収容する円筒部７１と、円筒部７１の一端から外側に突出するフランジ状の固定部７２と、円筒部７１の外周面に円周方向に沿って連続して形成する環状溝７３と、環状溝７３とは反対面のクランプ面７４と、クランプ面７４と環状溝７３の間に備わる変形可能な薄肉部７５と、円筒部７１の他端部に備わる厚肉の変形力作用部７６と、から構成してある。 The clamp sleeve 7 includes a cylindrical portion 71 concentrically accommodated in an upper space (annular space) of the uppermost space portion 21d, a flange-shaped fixing portion 72 protruding outward from one end of the cylindrical portion 71, and a cylindrical portion. An annular groove 73 formed continuously in the circumferential direction on the outer peripheral surface of 71, a clamp surface 74 opposite to the annular groove 73, and a deformable thin portion provided between the clamp surface 74 and the annular groove 73 75 and a thick deformation force acting portion 76 provided at the other end of the cylindrical portion 71.

一方、円テーブル３ｂの下部には、外周端３ｈの下端から半径方向内側に延びる円環状の端面３ｆと、外周端３ｈに対して段差状で軸方向下側に向かって延びるシリンダ部３ｇとを有し、シリンダ部３ｇには、外周端３ｈの外径よりも小径に設けられる第一の外周面３ｊと、この外径よりも幾分か小径で軸方向下側に向かって延びる第二の外周面３ｍとを形成し、第二の外周面３ｍの一部に、後述されるクランプスリーブ７によってクランプされる被クランプ面３ｅを構成する。 On the other hand, at the lower part of the circular table 3b, an annular end surface 3f extending radially inward from the lower end of the outer peripheral end 3h, and a cylinder part 3g extending stepwise downward in the axial direction with respect to the outer peripheral end 3h. The cylinder portion 3g has a first outer peripheral surface 3j provided with a smaller diameter than the outer diameter of the outer peripheral end 3h, and a second outer surface extending slightly downward in the axial direction with a diameter slightly smaller than the outer diameter. An outer peripheral surface 3m is formed, and a clamped surface 3e clamped by a clamp sleeve 7 described later is formed on a part of the second outer peripheral surface 3m.

他方、クランプスリーブ７は、フレーム２の上端部に組み付けられ、クランプスリーブ７の円筒部７１の内側に、円テーブル３ｂのシリンダ部３ｇを受け入れ可能に設けられる。なお、円テーブル３ｂの第二の外周面３ｍ、換言すれば被クランプ面３ｅは、後述する定常状態では、クランプスリーブ７のクランプ面７４との間で接触しないようにこれよりも幾分か小径の、いわゆる逃げ面を構成する。 On the other hand, the clamp sleeve 7 is assembled to the upper end portion of the frame 2 and is provided inside the cylindrical portion 71 of the clamp sleeve 7 so as to receive the cylinder portion 3g of the circular table 3b. It should be noted that the second outer peripheral surface 3m of the circular table 3b, in other words, the clamped surface 3e is somewhat smaller in diameter so as not to contact with the clamp surface 74 of the clamp sleeve 7 in a steady state to be described later. This constitutes a so-called flank.

クランプスリーブ７の円筒部７１は、その両端部（上端部と下端部）を厚肉部として形成し、また両端部の間の領域には、外周側より環状溝７３が設けられていて、円筒部７１の内周面とにより画定される薄肉部７５を形成する。円筒部７１の厚肉部の内周面が、軸方向の一部の領域で円テーブル３ｂの外周面との間に微少な隙間を有するように設けられる。円テーブル３ｂのシリンダ部３ｇの第一の外周面３ｊには、軸方向の領域の中央付近に円周方向に延びる外向溝３ｋを円筒部７１に対向させて刻設し、外向溝３ｋには、Ｏリング９、リング７１ｂの順にそれぞれ嵌め、リング７１ｂの外周面が、円筒部７１の厚肉部の内周に非常に軽く接触するように設けてある。円筒部７１の内周とリング７１ｂの外周部との接触が非常に軽いため、回転軸３ａの回転は妨げられない。なお、クランプスリーブ７における円筒部７１と固定部７２の境界は、明確に定められず、円筒部７１の一端部が環状溝７３の一部を形成する程度にあれば、それよりも上側部分を固定部７２として把握することも問題ない。 The cylindrical portion 71 of the clamp sleeve 7 has both end portions (upper end portion and lower end portion) formed as thick portions, and an annular groove 73 is provided in the region between both end portions from the outer peripheral side. A thin portion 75 defined by the inner peripheral surface of the portion 71 is formed. The inner peripheral surface of the thick portion of the cylindrical portion 71 is provided so as to have a small gap between the outer peripheral surface of the circular table 3b in a partial region in the axial direction. On the first outer peripheral surface 3j of the cylinder portion 3g of the circular table 3b, an outward groove 3k extending in the circumferential direction is formed near the center of the axial region so as to face the cylindrical portion 71, and the outward groove 3k The O-ring 9 and the ring 71b are fitted in this order, and the outer peripheral surface of the ring 71b is provided so as to come into very light contact with the inner periphery of the thick portion of the cylindrical portion 71. Since the contact between the inner periphery of the cylindrical portion 71 and the outer periphery of the ring 71b is very light, the rotation of the rotating shaft 3a is not hindered. Note that the boundary between the cylindrical portion 71 and the fixing portion 72 in the clamp sleeve 7 is not clearly defined. If the one end portion of the cylindrical portion 71 forms a part of the annular groove 73, the upper portion thereof is defined. There is no problem in grasping as the fixing portion 72.

円筒部７１の下端部は、円テーブル３ｂの回転を妨げないように、円テーブル３ｂの第二の外周面３ｍとの間、好ましくはフレーム２の内周面との間にも、隙間が設けられる。 A gap is provided between the lower end portion of the cylindrical portion 71 and the second outer peripheral surface 3m of the circular table 3b, preferably the inner peripheral surface of the frame 2 so as not to prevent the rotation of the circular table 3b. It is done.

固定部７２は、断面形状としてみたときに、その半径方向外側部分が円テーブル３ｂよりも突出するように設けられ、また半径方向内側部分が円テーブル３ｂの第一の外周面３ｊに対向するように配置されている。固定部７２の半径方向外側部分では、円周方向に間隔をおいて配設される複数のボルト等を介しフレーム２に固定してある。また、固定部７２の上端面は、円テーブル３ｂの端面３ｆとの間に、回転を妨げない程度に微少の隙間が設けられている。この隙間から切粉等の異物の侵入を防ぐため、固定部７２の上端面と円テーブル３ｂの端面３ｆとの双方に、第一溝７２ａ、第二溝７２ｂを別々に向かい合わせて同心状に形成し、第一溝７２ａと第二溝７２ｂとに跨って延びる例えば合成樹脂等を材料とする別のリング７２ｃを、第二溝７２ｂに嵌め合わせつつ他方の第一溝７２ａの底部に軽く接触する状態に収容してある。また、フレーム２の上端面には、段部２ｂが形成されるとともに、段部２ｂと固定部７２の下端面との間にＯリング９を配置し、この隙間からの切粉等の異物の侵入や油漏れを防ぐ。 When viewed as a cross-sectional shape, the fixing portion 72 is provided such that its radially outer portion protrudes from the circular table 3b, and its radially inner portion faces the first outer peripheral surface 3j of the circular table 3b. Is arranged. The outer portion in the radial direction of the fixing portion 72 is fixed to the frame 2 via a plurality of bolts and the like arranged at intervals in the circumferential direction. Further, a small gap is provided between the upper end surface of the fixing portion 72 and the end surface 3f of the circular table 3b so as not to prevent rotation. In order to prevent intrusion of foreign matters such as chips from this gap, the first groove 72a and the second groove 72b are concentrically opposed to both the upper end surface of the fixed portion 72 and the end surface 3f of the circular table 3b. Forming and extending another ring 72c made of, for example, synthetic resin or the like extending across the first groove 72a and the second groove 72b, and lightly touching the bottom of the other first groove 72a while fitting into the second groove 72b It is housed in a state to do. In addition, a step 2b is formed on the upper end surface of the frame 2, and an O-ring 9 is disposed between the step 2b and the lower end surface of the fixing portion 72, and foreign matter such as chips from the gap is disposed. Prevent intrusion and oil leaks.

環状溝７３は、薄肉部７５の外周部を形成するものであって、その側周面（図示の上下面）と底面を繋ぐ部分に、緩やかなＲ（丸み）をつけて連続するものである。また、底面は、薄肉部７５の両端から中心に向かうにつれて被クランプ面３ｅに近づくように、山型というか弧状に内側に張り出して湾曲する片側断面弧状に形成してある。 The annular groove 73 forms the outer peripheral portion of the thin-walled portion 75, and is continuous with a moderate R (roundness) at the portion connecting the side peripheral surface (upper and lower surfaces in the drawing) and the bottom surface. . Further, the bottom surface is formed in a one-sided cross-sectional arc shape that protrudes inwardly in a mountain shape or an arc shape so as to approach the clamped surface 3e from both ends of the thin portion 75 toward the center.

クランプ面７４は、薄肉部７５の内周部を形成するものであって、Ｒが無いこと以外は環状溝７３と同様の形状である。クランプ面７４のうち上下端部は、厳密にはクランプする部分ではなく、逃げ面７５ｂとなっている。 The clamp surface 74 forms the inner peripheral portion of the thin portion 75 and has the same shape as the annular groove 73 except that there is no R. Strictly speaking, the upper and lower end portions of the clamp surface 74 are not portions to be clamped but are flank surfaces 75b.

薄肉部７５は、円筒部７１の軸線方向中間部に相当するもので、被クランプ面３ｅに向かって山型というか弧状に張り出す形状に形成してある。詳細に言えば、図２に示すように薄肉部７５は、被クランプ面３ｅが軸線方向に平行である場合に、前記軸線方向の断面における肉厚の中間点の軌跡である軸線方向全域の中間線７５ａが、次の第一条件、第二条件を満たす形状をなすように形成されている。 The thin-walled portion 75 corresponds to an intermediate portion in the axial direction of the cylindrical portion 71, and is formed in a shape that projects in a mountain shape or an arc shape toward the clamped surface 3e. Specifically, as shown in FIG. 2, when the clamped surface 3e is parallel to the axial direction, the thin-walled portion 75 has an intermediate portion in the entire axial direction that is the locus of the intermediate point of the thickness in the axial cross section. The line 75a is formed so as to have a shape that satisfies the following first condition and second condition.

第一条件は、前記中間線７５ａを軸線方向に５等分する５つの領域Ａ〜Ｅに分け、５つの領域を一端から他端に向かって端部領域Ａ、中間領域Ｂ、中央領域Ｃ、中間領域Ｄ、端部領域Ｅとし、各領域内の中間線７５ａを回転体半径方向で平均した平均軌跡を形成し、各領域の平均軌跡と回転体３の被クランプ面３ｅとの距離ＬＡ〜ＬＥを、中央領域Ｃにおける距離ＬＣ、中間領域Ｂおよび中間領域Ｄにおける距離ＬＢ、ＬＤ、端部領域Ａおよび端部領域ＬＥにおける距離ＬＡ，ＬＥの順に大きくすることである。これにより、クランプスリーブ７の薄肉部７５には、圧縮方向に変形させる力が働くと、薄肉部７５は、領域全体的にそれの中間線７５ａの曲率がさらに変わるように変形する。 The first condition is that the intermediate line 75a is divided into five regions A to E that are equally divided into five in the axial direction, and the five regions are divided from one end to the other end region A, intermediate region B, central region C, The intermediate region D and the end region E are formed as an average locus in which the intermediate line 75a in each region is averaged in the radial direction of the rotating body, and the distance LA between the average locus of each region and the clamped surface 3e of the rotating body 3 LE is to increase in the order of distance LC in the central region C, distances LB and LD in the intermediate region B and intermediate region D, and distances LA and LE in the end region A and end region LE. As a result, when a force for deforming in the compression direction is applied to the thin portion 75 of the clamp sleeve 7, the thin portion 75 is deformed so that the curvature of the intermediate line 75a further changes in the entire region.

第二条件は、５つの領域の中間線７５ａの回転体半径方向における変化量ΔＡ〜ΔＥが、中央領域Ｃにおける変化量ΔＣ、中間領域Ｂおよび中間領域Ｄにおける変化量ΔＢ、ΔＤ、端部領域Ａおよび端部領域Ｅにおける変化量ΔＡ，ΔＥの順に大きくしてあることである。さらに、そのように設けられることにより、薄肉部７５は、領域全体的に、より確実に変形するようになる。 The second condition is that the change amounts ΔA to ΔE of the intermediate line 75a of the five regions in the radial direction of the rotor are the change amounts ΔC in the central region C, the change amounts ΔB and ΔD in the intermediate region B and the intermediate region D, and the end regions. That is, the amounts of change ΔA and ΔE in A and end region E are increased in this order. Further, by being provided as such, the thin portion 75 is more reliably deformed over the entire region.

また、図１の薄肉部７５は、その軸線方向全域の中間線７５ａが、全体的に連続する弓状の曲線形状をなすように、環状溝７３の底面およびクランプ面７４が設けられているとも言える。 In addition, the thin portion 75 of FIG. 1 is provided with the bottom surface of the annular groove 73 and the clamp surface 74 so that the intermediate line 75a in the entire axial direction has a generally continuous arcuate curved shape. I can say that.

変形力作用部７６は、円筒部７１の他端部に相当するものであって、その内周部および外周部を、円テーブル３ｂおよびフレーム２から隙間をおいて設けてある。変形力作用部７６はその下端面に配置されたピストン８ｂによって押し込まれるが、内外に隙間のあることで、上下動しやすくなっている。なお、クランプスリーブ７やピストン８ｂは、金属材料として、例えばニッケルやクロムなどを含有する機械構造用の合金鋼とし切削加工等により製作され、円テーブル３ｂやフレーム２の金属材料として、例えば機械構造用炭素鋼などの鋼材あるいは鋳鉄とし切削加工により製作される。 The deformation force acting portion 76 corresponds to the other end portion of the cylindrical portion 71, and has an inner peripheral portion and an outer peripheral portion with a gap from the circular table 3 b and the frame 2. The deformation force acting portion 76 is pushed in by the piston 8b disposed on the lower end surface thereof, but is easily moved up and down due to a gap inside and outside. The clamp sleeve 7 and the piston 8b are manufactured by cutting or the like as an alloy steel for machine structure containing, for example, nickel or chromium as a metal material, and as a metal material for the circular table 3b or the frame 2, for example, a machine structure It is made of steel such as carbon steel for steel or cast iron by cutting.

上述したクランプ装置５の第一例は、クランプ時にはフレーム２の外側から流路８ａに油を所定圧力で供給すると、ピストン８ｂが上昇してクランプスリーブ７の変形力作用部７６を押し込んで、クランプスリーブ７の薄肉部７５に対し圧縮方向に変形させる力が働く。薄肉部７５の中間線７５ａが上記した第一条件を満たすように、環状溝７３の底面およびクランプ面７４が設けられているため、圧縮方向の力を受けると、薄肉部７５は、領域全体的にそれの中間線７５ａの曲率がさらに小さくなるように変形する。この変形状態では、薄肉部７５のクランプ面７４が回転体３の被クランプ面３ｅに近づく方向に確実に進出して、最終的にはその変形によって被クランプ面３ｅを外周から挟み込む。流路８ａに供給する油圧は、変形力によって薄肉部７５が座屈して折れ曲がらない程度に設定しておく。 In the first example of the clamping device 5 described above, when oil is supplied to the flow path 8a from the outside of the frame 2 at a predetermined pressure at the time of clamping, the piston 8b rises and pushes the deformation force acting portion 76 of the clamping sleeve 7 to clamp A force that deforms the thin portion 75 of the sleeve 7 in the compression direction acts. Since the bottom surface of the annular groove 73 and the clamp surface 74 are provided so that the intermediate line 75a of the thin portion 75 satisfies the above-described first condition, when the force in the compression direction is received, the thin portion 75 Further, the intermediate line 75a is deformed so that the curvature thereof is further reduced. In this deformed state, the clamp surface 74 of the thin portion 75 surely advances in a direction approaching the clamped surface 3e of the rotating body 3, and finally the clamped surface 3e is sandwiched from the outer periphery by the deformation. The hydraulic pressure supplied to the flow path 8a is set to such an extent that the thin portion 75 is not buckled and bent by the deformation force.

一方、アンクランプ時には流路８ａに供給する油の圧力を解放すると、ピストン８ｂを介して薄肉部７５の圧縮方向に働く力が減少され、クランプスリーブ７（薄肉部７５）の復元力によってピストン８ｂが下降し、薄肉部７５は、領域全体的にそれの中間線７５ａの曲率がもとの大きい状態に戻るように変形し、薄肉部７５のクランプ面７４が回転体３の被クランプ面３ｅから後退して回転軸３ａを回転可能な状態にする。図１は、クランプ装置５の定常状態を示しており、ピストン８ｂが下降した状態でクランプ面７４と被クランプ面３ｅが離間している、あるいは非常に軽く接触しているアンクランプ状態を示している。 On the other hand, when the pressure of the oil supplied to the flow path 8a is released during unclamping, the force acting in the compression direction of the thin portion 75 via the piston 8b is reduced, and the piston 8b is restored by the restoring force of the clamp sleeve 7 (thin portion 75). The thin portion 75 is deformed so that the curvature of the intermediate line 75a returns to the original large state as a whole, and the clamp surface 74 of the thin portion 75 is separated from the clamped surface 3e of the rotating body 3. It reverse | retreats and the rotating shaft 3a is made into the state which can be rotated. FIG. 1 shows a steady state of the clamp device 5, showing an unclamped state in which the clamp surface 74 and the clamped surface 3 e are separated or very lightly in contact with the piston 8 b lowered. Yes.

クランプ装置５の第二例は、図３に示すように、クランプスリーブ７が固定部７２と円筒部７１を別体品としたものである。固定部７２は、半径方向内側部分が円筒部７１に向かって突出した片側断面Ｌ字状となっている。円筒部７１は、片側断面が左右対称形状の内側体７１ｃと外側体７１ｄを内外に突き合わせて片側断面樽状に設けたものである。内側体７１ｃの形状は第一例の円筒部７１の形状に相当する。 In the second example of the clamp device 5, as shown in FIG. 3, the clamp sleeve 7 has a fixed portion 72 and a cylindrical portion 71 as separate components. The fixing portion 72 has a L-shaped one-side cross section in which a radially inner portion protrudes toward the cylindrical portion 71. The cylindrical portion 71 is provided in a one-side cross-sectional barrel shape by abutting an inner body 71c and an outer body 71d whose one-side cross section is symmetrical in the left and right directions. The shape of the inner body 71c corresponds to the shape of the cylindrical portion 71 of the first example.

上述したクランプ装置５の第二例は、クランプ時には流路８ａに油を所定圧力で供給し、ピストン８ｂの上昇によって内側体７１ｃおよび外側体７１ｄを圧縮方向に変形させる。この変形状態では、内側体７１ｃと外側体７１ｄとの樽状断面が内側と外側にそれぞれ膨張するものとなり、内側体７１ｃは回転軸３ａの被クランプ面３ｅを挟持し、外側体７１ｄはフレーム２と密着して内側体７１ｃを軸方向の両端で支えるものとなる。図３は、定常状態を示しており、油圧の開放にともなうピストン８ｂの下降状態でアンクランプ状態を示している。 In the second example of the clamp device 5 described above, oil is supplied to the flow path 8a at a predetermined pressure at the time of clamping, and the inner body 71c and the outer body 71d are deformed in the compression direction by raising the piston 8b. In this deformed state, the barrel-shaped cross sections of the inner body 71c and the outer body 71d expand inward and outward, the inner body 71c holds the clamped surface 3e of the rotating shaft 3a, and the outer body 71d The inner body 71c is supported at both ends in the axial direction. FIG. 3 shows the steady state, and shows the unclamped state when the piston 8b is lowered as the hydraulic pressure is released.

クランプ装置５の第三例は図４に示すように、クランプスリーブ７とピストン８ｂを一体品とし、かつ、定常状態の場合には薄肉部７５の復元力によって、円テーブル３ｂを常時クランプするものとし、補助的にピストン８ｂの他端部（反円筒部側）から流路８ａに圧油を供給する。つまり、クランプスリーブ７は、円テーブル３ｂに対して、いわゆる嵌まり締めの状態となっており、また必要に応じて適宜圧油を供給することで適したクランプ力が得られるようになっている。また、薄肉部７５で円テーブル３ｂをアンクランプする場合、流路８ａへの圧油を開放するとともに、ピストン８ｂの一端側（円筒部７１側）に通じるアンクランプ用通路８ｃから圧油を供給する。アンクランプ用通路８ｃは、流路８ａとは隔絶してフレーム２内に形成してある。なお、図４は、アンクランプの状態を示している。 As shown in FIG. 4, the third example of the clamp device 5 is one in which the clamp sleeve 7 and the piston 8 b are integrated, and in a steady state, the circular table 3 b is always clamped by the restoring force of the thin portion 75. Then, pressure oil is supplied to the flow path 8a from the other end (on the side of the non-cylindrical portion) of the piston 8b. That is, the clamp sleeve 7 is in a so-called in-tightening state with respect to the circular table 3b, and a suitable clamping force can be obtained by appropriately supplying pressure oil as necessary. . Further, when the circular table 3b is unclamped by the thin wall portion 75, the pressure oil to the flow path 8a is released, and the pressure oil is supplied from the unclamping passage 8c leading to one end side (the cylindrical portion 71 side) of the piston 8b. To do. The unclamping passage 8c is formed in the frame 2 so as to be separated from the flow passage 8a. FIG. 4 shows an unclamped state.

クランプ装置５の第四例は、図５に示すように、第三例と異なる点は、クランプスリーブ７の薄肉部７５の形状を所々肉厚を変えた片側断面波状にし、軸線方向に複数個所でクランプする点である。 As shown in FIG. 5, the fourth example of the clamping device 5 is different from the third example in that the shape of the thin portion 75 of the clamp sleeve 7 is changed into a corrugated one-side cross section, and a plurality of locations in the axial direction are provided. It is a point to clamp with.

ここでの薄肉部７５は、その内周部および外周部の双方に断面Ｃ字状の小溝７５ｃを同心円状に且つ軸線方向に亘って間隔をおいて千鳥状（互い違い）に設けてある。詳述すると、薄肉部７５の内周部は、小溝７５ｃを軸線方向両側に間隔をおいて対称的に設け、小溝７５ｃよりも端側を片側断面山型の膨らみに形成してある。薄肉部７５の外周部は、片側断面弓状に形成し、軸線方向中央に小溝７５ｃを設けてある。 Here, the thin-walled portion 75 is provided with small grooves 75c having a C-shaped cross section on both the inner peripheral portion and the outer peripheral portion thereof in a concentric manner and spaced apart in the axial direction. More specifically, the inner peripheral portion of the thin portion 75 is provided with a small groove 75c symmetrically on both sides in the axial direction, and an end side of the small groove 75c is formed into a bulge with a one-side cross-sectional mountain shape. The outer peripheral portion of the thin portion 75 is formed in a one-side cross-sectional arc shape, and a small groove 75c is provided in the center in the axial direction.

クランプスリーブ７は図６に示すように、数種類の変形例がある。なお、（ハ）図以外は、中間線７５ａを明示するためにハッチングを省略してある。図６（イ）のクランプスリーブ７は、環状溝７３の側周面に対して開口側に向かって広がる傾斜を設けてあることが、第一例のクランプスリーブ７と相違する。また、クランプスリーブ７の薄肉部７５は、円形、或いは楕円形の弧状に形成してある。 The clamp sleeve 7 has several types of modifications as shown in FIG. In addition, (c) Other than the figure, hatching is omitted to clearly show the intermediate line 75a. The clamp sleeve 7 shown in FIG. 6 (a) is different from the clamp sleeve 7 of the first example in that an inclination that widens toward the opening side with respect to the side circumferential surface of the annular groove 73 is provided. The thin portion 75 of the clamp sleeve 7 is formed in a circular or elliptical arc shape.

図６（ロ）のクランプスリーブ７は、薄肉部７５の内周部にのみ複数の小溝７５ｃを、軸線方向に沿って間隔をおいて同心円状に設けたことが、図６（イ）のクランプスリーブ７と相違する。小溝７５ｃは、図では断面Ｃ字状であるが、角形、くさび形など他形状であっても良い。 The clamp sleeve 7 in FIG. 6 (b) is provided with a plurality of small grooves 75c concentrically at intervals along the axial direction only in the inner peripheral portion of the thin portion 75. Different from the sleeve 7. The small groove 75c has a C-shaped cross section in the drawing, but may have other shapes such as a square shape and a wedge shape.

図６（ハ）のクランプスリーブ７は、薄肉部７５に、軸線方向に延びるスリット７５ｄを、円筒部７１の円周方向に等間隔をおいて設けたことが、図６（イ）のクランプスリーブ７と相違する。このように軸方向に延びるスリット７５ｄを円周方向に複数設けたり、あるいは、図６（ロ）、（ハ）、また後述する図６（ニ）のように円周方向に溝を設けることにより、クランプ面７４が回転体３の被クランプ面３ｅに近づく方向への変形がより小さい力で行うことが可能になる。 The clamp sleeve 7 of FIG. 6 (c) is provided with slits 75d extending in the axial direction in the thin portion 75 at equal intervals in the circumferential direction of the cylindrical portion 71. 7 and different. Thus, by providing a plurality of slits 75d extending in the axial direction in the circumferential direction, or by providing grooves in the circumferential direction as shown in FIGS. 6 (b) and 6 (c) and FIG. 6 (d) described later. The clamping surface 74 can be deformed with a smaller force in a direction approaching the clamped surface 3e of the rotating body 3.

図６（ニ）のクランプスリーブ７は、薄肉部７５の内周面だけでなく外周面にも複数の小溝７５ｃを設けてあることが、図６（ロ）のクランプスリーブ７と相違する。 The clamp sleeve 7 in FIG. 6 (d) is different from the clamp sleeve 7 in FIG. 6 (b) in that a plurality of small grooves 75c are provided not only on the inner peripheral surface of the thin portion 75 but also on the outer peripheral surface.

図６（ホ）のクランプスリーブ７は、薄肉部７５を起伏の無い波状として、ほぼ均一の肉厚で形成したことが、クランプ装置５の第四例で用いたクランプスリーブ７と相違する。 The clamp sleeve 7 of FIG. 6 (e) is different from the clamp sleeve 7 used in the fourth example of the clamp device 5 in that the thin portion 75 is formed in a wave shape having no undulations and has a substantially uniform thickness.

図６（ヘ）のクランプスリーブ７は、薄肉部７５の内周部を軸線方向に平行なクランプ面７４とし、環状溝７３の溝幅を深さ方向に均一に設けたことが図６（イ）のクランプスリーブ７と相違する。 The clamp sleeve 7 shown in FIG. 6 (f) has the inner peripheral portion of the thin portion 75 as a clamp surface 74 parallel to the axial direction, and the groove width of the annular groove 73 is uniformly provided in the depth direction. This is different from the clamp sleeve 7).

図７のクランプスリーブ７は、リング状の複数の部品を上下に並べて組付けて一体化したものであり、ボルトを除いて５部品７ａ〜７ｅを用いている。真ん中の第一の部品７ａは、元々は円筒状の薄板輪であり、その軸線方向の上下端部を他の部品に固定することによって、軸線方向の中間部を軸線方向に向かって凹ませて片側断面弧状とした薄肉部７５を構成するものである。一番上の大きな第二の部品７ｂは、大部分が固定部７２となり、残りの部分が薄板輪の一端部の内周面を載せる土台となる。上から二番目の第三の部品７ｃは、薄板輪の一端部の外周面を抑える止め具である。第二の部品７ｂと第三の部品７ｃをボルトで固定することによって、両部品７ｂ、７ｃの間に薄板輪の一端部を挟持し、固定部７２だけでなく、円筒部７１の一端部を形成し、両部品７ｂ、７ｃの間に薄板輪の一端部の上保持空間７ｆを形成し、上保持空間７ｆの形状を薄板輪の一端部の形状に合わせてある。一番下の第四の部品７ｄは、薄板輪の他端部（図示の下端部）の内周面を載せる土台である。また、下から二番目の第五の部品７ｅは、薄板輪の他端部の外周面を抑える止め具である。第四の部品７ｄと第五の部品７ｅをボルトで固定することによって変形力作用部７６を構成し、また、第四の部品７ｄと第五の部品７ｅの間に薄板輪の他端部の下保持空間７ｇを形成し、下保持空間７ｇの形状を、薄板輪の他端部の形状に合わせてある。 The clamp sleeve 7 shown in FIG. 7 is formed by integrating a plurality of ring-shaped parts arranged one above the other, and uses five parts 7a to 7e except for bolts. The middle first part 7a is originally a cylindrical thin plate ring, and its axially upper and lower end parts are fixed to other parts so that the axially intermediate part is recessed toward the axial direction. The thin-walled portion 75 having an arc shape on one side is configured. The uppermost second part 7b is mostly a fixed part 72, and the remaining part is a base on which the inner peripheral surface of one end of the thin plate wheel is placed. The third part 7c, the second from the top, is a stopper that suppresses the outer peripheral surface of one end of the thin plate wheel. By fixing the second part 7b and the third part 7c with bolts, one end of the thin plate wheel is sandwiched between the parts 7b and 7c, and not only the fixing part 72 but also one end of the cylindrical part 71 The upper holding space 7f of one end of the thin plate wheel is formed between the parts 7b and 7c, and the shape of the upper holding space 7f is matched to the shape of the one end of the thin plate ring. The lowermost fourth component 7d is a base on which the inner peripheral surface of the other end (the lower end in the figure) of the thin plate wheel is placed. The fifth part 7e that is second from the bottom is a stopper that holds down the outer peripheral surface of the other end of the thin plate wheel. The deformation force acting part 76 is configured by fixing the fourth part 7d and the fifth part 7e with bolts, and the other end portion of the thin plate wheel is interposed between the fourth part 7d and the fifth part 7e. A lower holding space 7g is formed, and the shape of the lower holding space 7g is matched to the shape of the other end of the thin plate wheel.

本発明は上記実施形態に限定されない。例えば、上記した実施例は、内側にある回転軸３ａを、クランプスリーブ７によって外側から挟持するように設けているが、これらの内外関係を逆にする割出装置１、すなわち回転体３の回転軸３ａを円筒状に設け、その回転軸３ａをクランプスリーブ７によって内側から挟持する割出装置１にも適用可能である。また、回転体３の駆動には、ウォーム機構を用いて間接的に駆動しているが、直接駆動機構、いわゆる回転軸３ａとフレーム２との間の空間に組み込まれたＤＤモータを用いるものであっても良い。 The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the rotary shaft 3a on the inner side is provided so as to be clamped from the outer side by the clamp sleeve 7, but the indexing device 1, that is, the rotation of the rotary body 3 is reversed. The present invention is also applicable to the indexing device 1 in which the shaft 3a is provided in a cylindrical shape and the rotating shaft 3a is clamped from the inside by the clamp sleeve 7. The rotator 3 is driven indirectly using a worm mechanism, but a direct drive mechanism, that is, a DD motor incorporated in a space between the rotation shaft 3a and the frame 2 is used. There may be.

また、割出装置１は、その使用時に停電が発生して油圧が低下した場合に、回転軸３ａの回転を自動的に停止させるために、前述した第三例、第四例と同様の、いわゆる嵌まり締めの構成を用いるクランプ装置５を用いるものであっても良い。 Further, the indexing device 1 is similar to the third example and the fourth example described above in order to automatically stop the rotation of the rotary shaft 3a when a power failure occurs during use and the hydraulic pressure is reduced. You may use the clamp apparatus 5 which uses what is called a fitting fastening structure.

なお、割出装置１は、インデックステーブルに限らず、五軸加工機のいわゆるＵ軸ヘッド（工具が取り付けられるスピンドルヘッドを割り出し駆動する加工軸ヘッド）にも適用可能である。 The indexing device 1 is not limited to an index table, but can be applied to a so-called U-axis head of a five-axis machine (a machining axis head that indexes and drives a spindle head to which a tool is attached).

本発明のクランプ装置の第一例を示す断面図である。It is sectional drawing which shows the 1st example of the clamp apparatus of this invention. 図１のクランプスリーブの説明図である。It is explanatory drawing of the clamp sleeve of FIG. 本発明のクランプ装置の第二例を示す断面図である。It is sectional drawing which shows the 2nd example of the clamp apparatus of this invention. 本発明のクランプ装置の第三例を示す断面図である。It is sectional drawing which shows the 3rd example of the clamp apparatus of this invention. 本発明のクランプ装置の第四例を示す断面図である。It is sectional drawing which shows the 4th example of the clamp apparatus of this invention. （イ）〜（ヘ）図は、クランプスリーブの他の例を示す要部片側断面図である。(A)-(f) is a fragmentary sectional side view showing another example of a clamp sleeve. クランプスリーブの変形例を示す要部片側断面図である。It is principal part half sectional drawing which shows the modification of a clamp sleeve.

Explanation of symbols

１割出装置、２フレーム、２ａ収容室、２ｂ段部
２１ａ空間部、２１ｂ空間部、２１ｃ空間部、２１ｄ空間部（環状空間）、
２２プレート、２３シール部材、
３回転体、３ａ回転軸、３ｂ円テーブル、３ｃ軸用貫通孔、３ｄテーブル用貫通孔、３ｅ被クランプ面、３ｆ端面、３ｇシリンダ部、３ｈ外周端、３ｊ第一の外周面、３ｍ第二の外周面、３ｋ外向溝、３ｍ逃げ面、
４軸受、４ａ内輪、４ｂ外輪、４ｃ押え板、
５クランプ装置、
６回転駆動装置、６ａウォームホイール、６ｂウォームスピンドル、６ｃ間隙部材、
７クランプスリーブ
７ａ第一の部品、７ｂ第二の部品、７ｃ第三の部品、７ｄ第四の部品、７ｅ第五の部品、
７ｆ上保持空間、７ｇ下保持空間
７１円筒部、７１ｂリング、７１ｃ内側体、７１ｄ外側体
７２固定部、７２ａ第一溝、７２ｂ第二溝、７２ｃリング、
７３環状溝、７４クランプ面、７５薄肉部、７５ａ中間線、７５ｂ逃げ面、７５ｃ小溝、７５ｄスリット、
７６変形力作用部
８変形力発生手段、８ａ流路、８ａ１シリンダ室、８ｂピストン、８ｂ１凹部、８ｃアンクランプ用通路、
９Ｏリング 1 indexing device, 2 frame, 2a storage chamber, 2b stepped part 21a space part, 21b space part, 21c space part, 21d space part (annular space),
22 plates, 23 seal members,
3 Rotating body, 3a Rotating shaft, 3b Rotary table, 3c Shaft through hole, 3d Table through hole, 3e Clamped surface, 3f End surface, 3g Cylinder part, 3h Outer end, 3j First outer peripheral surface, 3m Second Outer peripheral surface, 3k outward groove, 3m flank,
4 Bearing, 4a Inner ring, 4b Outer ring, 4c Presser plate,
5 Clamp device,
6 rotation drive device, 6a worm wheel, 6b worm spindle, 6c gap member,
7 Clamp sleeve 7a 1st part, 7b 2nd part, 7c 3rd part, 7d 4th part, 7e 5th part,
7f Upper holding space, 7g Lower holding space 71 Cylindrical portion, 71b ring, 71c inner body, 71d outer body 72 fixing portion, 72a first groove, 72b second groove, 72c ring,
73 annular groove, 74 clamping surface, 75 thin part, 75a intermediate line, 75b relief surface, 75c small groove, 75d slit,
76 Deformation force acting part 8 Deformation force generating means, 8a flow path, 8a1 cylinder chamber, 8b piston, 8b1 recess, 8c unclamping passage,
9 O-ring

Claims

A cylindrical portion (71) disposed in an annular space (21d) between the rotating body (3) and the frame (2), and an annular surface extending in the axial direction of the rotating body among the inner peripheral portion or the outer peripheral portion of the cylindrical portion. The clamp surface (74) provided in the peripheral portion facing the clamped surface (3e) which is parallel to the axial direction and the circumference on the opposite side of the peripheral portion of the cylindrical portion where the clamp surface is provided An annular groove (73) provided continuously along the direction, a thin part (75) defined by the clamp surface and the bottom surface of the annular groove, and a frame fixing part (72) provided at one end of the cylindrical part A clamping sleeve having
The other end portion of the cylindrical portion is provided with a deformation force acting portion (76) that receives a force in the compression direction or the tension direction applied in the axial direction,
The thin portion is formed such that the intermediate line (75a) in the entire axial direction that is the locus of the intermediate point of the thickness in the cross section in the axial direction forms a shape that satisfies the first condition,
The first condition is divided into five regions for 5 equally dividing the intermediate line in the axial direction, the central region toward the end of the five regions from the central, intermediate region, and an end region, the intermediate lines in the respective areas clamp sleeve, characterized in that the distance between the average path averaged over the rotary body radially between the clamping surface of the rotating body is the central region, intermediate region, increases in the order of the end region, which is a.

The thin part is formed so that the intermediate line in the entire axial direction forms a shape that satisfies the second condition,
The second condition is five variation in the rotational body radial direction of the intermediate line regions, the central region, the clamp sleeve according to claim 1, wherein the intermediate region is larger in the order of the end regions is .

The clamp sleeve according to claim 2, wherein a bottom surface or a clamp surface of the annular groove is provided so that an intermediate line in the whole axial direction of the thin wall portion forms a continuous curved shape as a whole.

The clamp sleeve according to any one of claims 1 to 3, wherein the bottom surface of the annular groove is provided so as to approach the clamped surface of the rotating body from the both ends of the thin portion toward the center.

The clamp sleeve according to claim 4, wherein the clamp surface is provided so as to approach the clamped surface of the rotating body from the both ends of the thin portion toward the center.

The clamp sleeve according to any one of claims 1 to 4, wherein the thin portion is provided with a plurality of slits (75d) at intervals in the circumferential direction.

The clamp sleeve (7) accommodated in the annular space (21d) between the rotating body (3) and the frame (2), and deformation force generating means (8) for applying a force to the clamp sleeve,
The clamp sleeve is a cylindrical surface (71) disposed in the annular space, and an annular surface extending in the axial direction of the rotating body among the inner peripheral portion or the outer peripheral portion of the cylindrical portion, and a clamped surface (parallel to the axial direction) 3e) an annular groove (73) provided continuously along the circumferential direction on the clamp surface (74) provided in the peripheral portion opposite to the peripheral portion of the cylindrical portion provided with the clamp surface. ), A thin portion (75) defined by the clamp surface and the bottom surface of the annular groove, and a fixing portion (72) to the frame provided at one end of the cylindrical portion,
The clamp sleeve is provided with a deformation force acting portion (76) that receives a force in the tensile direction applied in the axial direction at the other end of the cylindrical portion,
The thin portion is formed such that the intermediate line (75a) in the entire axial direction that is the locus of the intermediate point of the thickness in the cross section in the axial direction forms a shape that satisfies the first condition,
The first condition is divided into five regions for 5 equally dividing the intermediate line in the axial direction, the central region toward the end of the five regions from the central, intermediate region, and an end region, the intermediate lines in the respective areas distance between the average path averaged over the rotary body radially between the clamping surface of the rotary member is increased in the order of the central region, intermediate region, the end region is,
When a predetermined amount of force in the pulling direction is applied to the deformation force acting portion via the deformation force generating means in the state where the clamp sleeve is accommodated in the annular space, the clamp surface of the thin portion is the clamped surface of the rotating body. Retreat in the direction away from the rotating body to unclamp,
When the force from the deforming force generating means to the deforming force acting portion is released, the clamping surface of the thin wall portion is advanced in the direction of pressing the clamped surface of the rotating body by the restoring force, and the rotating body is clamped. A clamp device for an indexing device.

The clamp sleeve (7) accommodated in the annular space (21d) between the rotating body (3) and the frame (2), and deformation force generating means (8) for applying a force to the clamp sleeve,
The clamp sleeve is a cylindrical surface (71) disposed in the annular space, and an annular surface extending in the axial direction of the rotating body among the inner peripheral portion or the outer peripheral portion of the cylindrical portion, and a clamped surface (parallel to the axial direction) 3e) an annular groove (73) provided continuously along the circumferential direction on the clamp surface (74) provided in the peripheral portion opposite to the peripheral portion of the cylindrical portion provided with the clamp surface. ), A thin portion (75) defined by the clamp surface and the bottom surface of the annular groove, and a fixing portion (72) to the frame provided at one end of the cylindrical portion,
The clamp sleeve is provided with a deformation force acting part (76) that receives a force in the compression direction applied in the axial direction at the other end of the cylindrical part,
The thin portion is formed such that the intermediate line (75a) in the entire axial direction that is the locus of the intermediate point of the thickness in the cross section in the axial direction forms a shape that satisfies the first condition,
The first condition is divided into five regions for 5 equally dividing the intermediate line in the axial direction, the central region toward the end of the five regions from the central, intermediate region, and an end region, the intermediate lines in the respective areas distance between the average path averaged over the rotary body radially between the clamping surface of the rotary member is increased in the order of the central region, intermediate region, the end region is,
When the clamp sleeve is housed in the annular space and a predetermined amount of force in the compression direction is applied to the deformation force acting portion via the deformation force generating means, the clamp surface of the thin wall portion becomes the clamped surface of the rotating body. To advance in the direction approaching the
When the force from the deformation force generating means to the deformation force acting part is released, the clamping surface of the thin wall part is retracted in the direction away from the clamped surface of the rotating body by the restoring force to put the rotating body in an unclamped state. A clamp device for an indexing device.