JP2019059002A - Fixing mechanism - Google Patents

Abstract

To provide a fixing mechanism capable of improving working efficiency for installing a fixing object.SOLUTION: A fixing mechanism comprises at least one insertion hole 507 opening one end part to an external part, a holding member 501 forming at least one communication hole 506 extending to the external part from an inner wall surface of the insertion hole, an operation member 509 having a body part arranged in the respective insertion holes of the holding member so as to be movable in the axial direction and rotatable around the axial direction and formed in a columnar shape and a male screw part extending in the axial direction from a first end part of the body part, a movable member 510 movably arranged in the axial direction on the opposite side of the operation member by sandwiching the communication hole on the other end part side of the respective insertion holes of the holding member and having a female screw part, regulation means 514 and 515 regulating rotation around the axial direction of the movable member in the insertion holes and a deformable deformation member 502 held so as to block up the communication hole on an outer surface of the holding member, and oil is filled between the operation member and the movable member and in the communication hole in the respective insertion holes.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a fixation mechanism.

  Conventionally, for example, honing is known as finishing on gears. In these processes, finish machining is performed by rotating the workpiece gear to be processed and the grinding wheel gear while meshing with each other.

  For example, Patent Document 1 describes a gear processing apparatus that performs honing processing. In this device, a gear to be processed is supported by being pinched from both axial ends by a pair of fixing tools, and the gear is engaged with an annular tool having an internal gear-like tool. The gear is finished by rotating the tool and the gear together in this state.

  By the way, in an apparatus like the above-mentioned patent documents 1, although an internal gear-like tool is attached to an annular support, attachment of a tool is performed by the following fixing mechanisms. That is, the cylindrical deformation member is attached to the inner wall surface of the annular support, and the tool is attached to the inner wall surface of the deformation member. Further, in the support, insertion holes are formed at predetermined intervals in the circumferential direction, and pins are respectively inserted into the insertion holes. Further, in the insertion hole, a communication hole communicating with the inner circumferential surface of the support is formed, and the insertion hole and the communication hole are filled with hydraulic oil.

  With the above configuration, when the pin is made to enter the insertion hole, the pressure of the hydraulic oil is increased, and the hydraulic oil presses the deformation member radially inward through the communication hole. As a result, the tool is pressed and fixed to the support.

JP, 2013-18080, A

  However, since it takes time to enter the pin, there has been a demand for further improvement to improve the work efficiency. Further, the fixing mechanism using such hydraulic oil is not limited to the one that presses and fixes the annular fixed object from the radially outward direction, and presses and fixes the annular fixed object from the radially inward direction In such cases, the above problems may occur. The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a fixing mechanism capable of improving the work efficiency of attachment of a fixed object.

  The holding mechanism according to the present invention includes a holding member in which at least one insertion hole whose at least one end is open to the outside and at least one communication hole extending to the outside from an inner wall surface of the insertion hole are formed. On the one end side of each insertion hole of the member, it is movable in the axial direction of the insertion hole and rotatably disposed around the axial direction, and is formed in a cylindrical shape having a first end and a second end. An operation member having a main body portion and an external thread portion extending in the axial direction from the first end portion of the main body portion, and the other end side of each insertion hole of the holding member A movable member disposed on the opposite side to the operation member so as to be movable in the axial direction and having a female screw portion screwed with the male screw portion, and the movable member in the insertion hole around the axial direction of the movable member Control means for restricting the rotation of the Te, the held so as to close the communication hole, and a deformable member deformable, in each of the insertion holes, between the operating member and the movable member, and the communicating hole oil is filled.

  According to this configuration, when the operating member is rotated about the axis in the insertion hole, the male screw attached to the operating member is also rotated, whereby the male screw is screwed into the female screw of the movable member. Since rotation of the movable member is restricted about the axis, the movable member moves in the axial direction as the male screw rotates. As a result, the operation member and the movable member approach each other in the insertion hole. As a result, the pressure of the hydraulic oil is increased, and the deformation member is pressed to fix the fixed object attached to the outer surface of the holding member.

  As described above, in the present invention, by operating the operating member, the movable member is also operated at the same time to apply pressure to the hydraulic fluid, so the working time for increasing the pressure of the hydraulic fluid is increased. It can be shortened. As a result, it is possible to shorten the time of attachment of the object to be fixed.

  In the fixing mechanism, on the inner wall surface of each of the insertion holes, a stopper may be provided on the one end side with respect to the communication hole, for restricting the entrance of the operation member to the other end side.

  According to this configuration, since the axial movement of the operation member is restricted by the stopper, the operator can recognize the end of the rotation of the operation member.

  In the fixing mechanism, the holding member is formed in a cylindrical shape, and a plurality of the insertion holes are formed, and the plurality of insertion holes are directed in the axial direction in the holding member. A communication hole which is formed at a predetermined interval so as to open on the side surface and which communicates with the insertion holes is formed to open at the inner peripheral surface of the holding member, and the deformation member closes the communication hole Thus, it may be formed in a cylindrical shape disposed so as to be in close contact with the inner wall surface of the holding member.

  In the fixing mechanism, the holding member is formed in a cylindrical shape, a plurality of the communication holes are formed, and the insertion hole is opened on one of the side surfaces facing in the axial direction in the holding member. The plurality of communication holes are formed to open at the outer peripheral surface of the holding member, and the deformation member is disposed to be in close contact with the outer peripheral surface of the holding member so as to close the communication hole. Can be formed in a cylindrical shape.

  As mentioned above, the work efficiency of attachment of a fixed thing can be improved.

It is a perspective view of a gear processing device concerning one embodiment of the present invention. It is a front view of FIG. It is a top view of FIG. It is the sectional view on the AA line of FIG. It is an expanded sectional view of the housing in FIG. It is the BB sectional drawing of FIG. It is the CC sectional view taken on the line of FIG. It is an expanded sectional view of the fixing mechanism which fixes a tool. It is an expanded sectional view explaining operation | movement of the fixing mechanism of FIG. It is an expanded sectional view showing other examples of a fixing mechanism.

  Hereinafter, an embodiment of a gear machining apparatus according to the present invention will be described with reference to the drawings. 1, 2 and 3 are a perspective view, a front view and a plan view, respectively, of a gear machining device according to the present embodiment. In the following description, the left and right of FIG. 1 will be referred to as the X axis direction or left and right direction, the top and bottom of FIG. 1 as the Z axis or up and down direction, and the top and bottom of FIG. 2 as the Y axis direction or front and back direction. I will. However, the present invention is not limited to these directions.

  As shown in FIGS. 1 to 3, the gear machining device according to the present embodiment includes a tool unit 2 and a work support unit 3 disposed on a base 1. The tool unit 2 has an annular housing 21 which is formed in an annular shape and to which the tool 4 is fixed, and the axial direction of the housing 21 is disposed so as to be generally directed in the X axis direction to mesh with the gear which is the work W It is supposed to be. The work support unit 3 is composed of a headstock 31 and a tailstock 32 for holding the work W, which are disposed on both sides of the base 1 in the X-axis direction with the tool unit 2 interposed therebetween. .

  First, the work support unit 3 will be described. As shown in FIGS. 1 to 3, the work supporting unit 3 includes the above-described spindle stock 31 and the tailstock 32, which move close to and separate from each other in the X-axis direction to rotate the work W. It is designed to be held freely.

  Next, the spindle stock 31 will be described. The headstock 31 is disposed on a first support frame 311 disposed on the left side on the base 1 with the tool unit interposed therebetween. The first support frame 311 is formed in a triangular shape in a side view, and a pair of rails 312 extending in the Y-axis direction is attached to both ends in the X-axis direction. That is, these rails 312 are arranged on the inclined surface 310 which descends as it goes forward. The inclination angle of the rails 312 is not particularly limited, but may be, for example, 10 to 45 degrees (about 30 degrees in the present embodiment). Then, on the first support frame 311, a first support block 313 supported by both rails 312 and movable in a tilted manner in the Y-axis direction is disposed. A nut (not shown) is connected to the lower surface of the first support block 313, and a ball screw (not shown) extending parallel to the rail 312 is engaged with the nut. A motor 316 is coupled to the ball screw. Therefore, when the ball screw is rotated by the motor 316, the first support block 313 is moved along the inclined surface 310 of the first support frame 311 in the Y-axis direction.

  A pair of rails 317 extending in parallel to the X-axis direction is disposed on the upper surface of the first support block 313, and the headstock 31 can move in the X-axis direction along these rails. A nut (not shown) is connected to the lower surface of the headstock 31 and a ball screw (not shown) extending parallel to the rail 317 is screwed into the nut. A motor 3190 is connected to this ball screw. Therefore, when the ball screw is rotated by the motor 3190, the spindle stock 31 moves on the first support block 313 in the X-axis direction.

  A shaft member 3101 which protrudes in the X direction and supports the work W is rotatably provided at the tip of the spindle stock 31 and is rotationally driven by a built-in motor (not shown).

  Next, the tailstock 32 will be described. The tailstock 32 is also configured similarly to the headstock 31. That is, the tailstock 32 is disposed on the second support frame 321 disposed on the right side on the base 1 with the tool unit 2 interposed therebetween. The second support frame 321 is formed in a triangular shape in a side view, and a pair of rails 322 extending in the Y-axis direction is attached to both ends in the X-axis direction. That is, these rails 322 are arranged on the inclined surface 320 which is processed as it goes forward. The inclination angle of the rail 322 is the same as the inclination angle of the spindle stock 31. Then, on the second support frame 321, a second support block 323 supported by both the rails 322 and movable in the Y-axis direction is disposed. A nut (not shown) is connected to the lower surface of the second support block 323, and a ball screw (not shown) extending parallel to the rail 322 is engaged with the nut. A motor 326 is connected to this ball screw. Therefore, when the ball screw is rotated by the motor 326, the second support block 323 moves in the Y-axis direction along the inclined surface 320 of the second support frame 321.

  A pair of rails 327 extending in parallel to the X-axis direction is disposed on the upper surface of the second support block 323, and the tailstock 32 can move in the X-axis direction along the rails 327. A nut (not shown) is connected to the lower surface of the tailstock 32 and a ball screw (not shown) extending parallel to the rail 327 is engaged with the nut. A motor 3290 is connected to this ball screw. Therefore, when the ball screw is rotated by the motor 3290, the tailstock 32 moves on the second support block 323 in the X-axis direction.

  In addition, a shaft member 3201 for supporting the work W is rotatably provided at the tip of the tailstock 32 so as to hold the work W with the shaft member 3101 of the headstock 31. . The headstock 31 and the tailstock 32 are controlled to move integrally in the X-axis direction and the Y-axis direction, and both move in the X-axis direction and the Y-axis direction while holding the work W And the work W is brought close to and separated from the tool of the tool unit 2.

  Next, the tool unit 2 will be described in detail with reference to FIG. FIG. 4 is a cross-sectional view taken along line AA of FIG. The housing 21 of the tool unit 2 is formed in an annular shape, movable in the Y-axis direction and inclined with the Y-axis in the YZ plane in order to form a cross angle with the work W and to apply crowning. It can rotate around the rotation axis S. Therefore, the tool unit 2 includes the support 23 disposed on the base 1 and supporting the housing 21 described above. In addition, the housing 21 is rotatably supported by the support 23 at both ends of the above-described rotation axis S. That is, the first shaft end member 41 is attached to the front end side of the rotational shaft S of the housing 21 and the second shaft end member 42 is attached to the rear end side. The first and second shaft end members 41 and 42 are supported by the support 23. Hereinafter, the support 23 will be described in detail.

  As shown in FIG. 4, the support 23 is provided at a base 231 movable in the Y-axis direction on the base 1 and at the front end of the base 231 to support the first axial end member 41 of the housing 21. A first support portion 232 and a second support portion 233 provided at the rear end portion of the base portion 231 and supporting the second shaft end member 42 of the housing 21 are provided. The base portion 231 is, in a side view, a front end surface 2311 inclined upward, a central surface 2312 continuous with the front end surface 2311 in an arc shape, and a rear end of the central surface 2312 inclined upward It has a rear end face 2313, which are arranged in this order from the front to the rear. The inclination angle of the front end surface 2311 and the rear end surface 2313 is the same as the inclination surface of the workpiece support unit 3. In this configuration, the rear end face 2313 is at a position higher than the front end face 2311, the first support portion 232 is attached to the front end face 2311, and the second support portion 233 is attached to the rear end face 2313.

  The first shaft end member 41 of the housing 21 is rotatably supported by the first support portion 232, and the second shaft end member 42 is rotatably supported by the second support portion 233. Thereby, the housing 21 is rotatable around the rotation axis S extending at the inclination angle. The arc shape of the central surface 2312 is such that the housing 21 is along the outer peripheral surface.

  Next, a tool attachment structure and the like in the tool unit 2 including the housing 21 will be described with reference to FIGS. 5 is an enlarged sectional view of the housing in FIG. 4, FIG. 6 is a sectional view taken along the line B-B in FIG. 5, and FIG. 7 is a sectional view taken along the line C-C in FIG.

  As shown in FIGS. 5 to 7, the tool unit 2 has a generally annular housing 21 and a tool support 25 rotatably provided on the inner peripheral side of the housing 21 via a pair of bearings 241 and 242. And an internal gear-like tool 4 attached to the inner peripheral surface of the tool support 25. The tool unit 2 is also provided with a motor 5 for rotating the tool support 25 relative to the housing 21. Furthermore, the tool unit 2 is provided with a detector 6 for detecting the rotational angle position of the tool support 25. Hereinafter, each member will be described in detail.

  As shown in FIGS. 6 and 7, the housing 21 is provided at an annular housing main body 211, an annular cooling member 212 provided at the left end in the axial direction of the housing main body 211, and at the left end of the cooling member 212. And an annular second end member 214 provided at the axial right end of the housing main body 211.

  The housing main body 211 has a central portion 2110 located near the center in the axial direction, a first portion 2111 protruding radially outward on the left end side in the axial direction, and a second portion located on the right end portion in the axial direction And a portion 2112, which are integrally formed. The inner diameter of the central portion 2110 is the smallest, and the pair of bearings 241 and 242 described above are attached to the inner peripheral surface of the central portion 2110 at predetermined intervals in the axial direction. Each of the bearings 241 and 242 is a known one provided with an outer ring, an inner ring, and a rolling element (ball or roller) held therebetween. Since the first portion 2111 bulges radially outward, the outer diameter and the inner diameter are larger than the central portion 2110. Specifically, the inner circumferential surface of the first portion 2111 is located radially outward of the outer circumferential surface of the central portion 2110. Thus, a motor accommodating space 26 is formed between the inner peripheral surface of the first portion 2111 and the tool support 25 to accommodate the tool driving motor 5 and the like.

  On the other hand, the outer diameter of the second portion 2112 is the same as that of the central portion 2110. That is, the outer peripheral surfaces of the central portion 2110 and the second portion 2112 are continuous. Further, the inner diameter of the second portion 2112 is slightly larger than that of the central portion 2110, whereby the above-described detector 6 is disposed between the inner peripheral surface of the second portion 2112 and the tool support 25. A vessel housing space 27 is formed.

  Next, the tool support 25 will be described. As shown in FIGS. 5 to 7, the tool support 25 includes an annular support body 251, an annular connecting member 252 provided at the axial left end of the support body 251, and a left end of the connecting member 252. And an annular second end member 254 provided at the axial right end of the support main body 251. Further, a first cover member 255 and a second cover member 256 are attached to the first end member 253 and the second end member 254, respectively. Hereinafter, each member will be described in detail.

  The support main body 251 is provided at a position corresponding to the central portion 2110 and the second portion 2112 of the housing main body 211, and has a central portion 2510 aligned in the axial direction and an end portion 2511 on the right side thereof. The above-described two bearings 241 and 242 and the supply member 28 are fixed to the outer peripheral surface of the central portion 2510. On the other hand, the tool 4 is fixed to the inner peripheral surface of the central portion 2510. Hereinafter, the attachment structure of the tool 4 to the tool support 25 will be described.

  FIG. 8 is an enlarged view of FIG. 7 showing the fixing mechanism of the tool. As shown in FIGS. 7 and 8, in the central portion (holding member) 2510, a plurality of recesses are formed at predetermined intervals along the circumferential direction of the support main body 251, and each recess is a housing portion 501 is attached. In each housing portion 501, the inner circumferential surface facing the tool 4 is formed in a circular arc shape in cross section that is exposed from the support main body 251 and matches the inner circumferential surface of the support main body 251.

  Further, on the inner peripheral surface of the support main body 251, a deformation member 502 formed in a cylindrical shape with a thin plate is attached over the entire circumference. That is, the deformation member 502 is in contact with the inner peripheral surface of the support main body 251 and the inner peripheral surface of the accommodation portion 501. The deformation member 502 is formed of, for example, a metal material having a thickness of 2.4 to 2.5 mm. Specifically, for example, it can be formed of a metal such as chromium mobriden steel.

  A shallow first concave portion 503 extending in a strip shape is formed near the axial center of the inner peripheral surface of the housing portion 501, and a deep second concave portion 504 is formed at both ends thereof. The depth of the first recess 503 can be, for example, 0.2 to 0.3 mm. The O-ring 505 is accommodated in the second recess 504. Thus, a first concave portion 503 sandwiched by the pair of O-rings 505 is formed between the deformation member 502 and the housing portion 501, and the first concave portion 503 includes the deformation member 502, the housing portion 501, and A sealed space is formed between the pair of O-rings 505.

  Further, a communication hole 506 extends radially outward from the first recess 503. In addition, an insertion hole 507 having a circular cross section that extends in the axial direction and penetrates the storage portion 501 is formed inside the storage portion 501. The communication hole 506 described above is connected near the axial center of the insertion hole 507. Therefore, the insertion hole 507 and the first recess 503 are in communication via the communication hole 506.

  A small diameter portion (stopper) 508 having a small inner diameter is formed in a portion of the insertion hole 507 communicating with the communication hole 506. The opening of the communication hole 506 is formed on the inner wall surface of the small diameter portion 508. Further, a cylindrical operation member 509 is disposed on the left side in the axial direction across the small diameter portion 508 in the insertion hole 507, and a cylindrical movable member 510 on the right side in the axial direction sandwiching the small diameter portion 508. Is arranged.

  The outer peripheral surface of the operation member 509 is in close contact with the inner wall surface of the insertion hole 507, and the operation member 509 is movable in the axial direction of the insertion hole 507 in the close contact state. A work tool recess 511 into which a work tool such as a hexagonal wrench can be inserted is formed at the left end portion of the operation member 509, and is exposed to the outside from an opening on the left side of the insertion hole 507. On the other hand, at the right end portion of the operation member 509, a cylindrical male screw portion 512 extending in the axial direction of the insertion hole 507 is provided. The male screw portion 512 is formed in a rod shape, and is connected to the movable member 510 beyond the small diameter portion 508. An external thread is formed at the tip of the external thread portion 512 and is screwed into the internal thread 513 formed on the movable member 510.

  The outer peripheral surface of the movable member 510 is in close contact with the inner wall surface of the insertion hole 509, and the movable member 510 is movable in the axial direction of the insertion hole 509 in the close contact state. Further, at the right end portion of the movable member 513, a protrusion 514 protruding radially outward is formed, and this protrusion 514 is engaged with a groove 515 formed on the inner wall surface of the insertion hole 509. There is. The groove 515 extends from the right end of the insertion hole 509 to the left. Therefore, the movable member 510 is configured to move in the axial direction in a state in which the rotation around the axis is restricted by the projection 514 being engaged with the groove 515. Further, a through hole 516 extending in the axial direction is formed in the movable member 510, and as described above, a female screw 513 with which the male screw portion 512 of the operation member 509 is screwed is formed in the through hole 516. ing.

  With the above configuration, a sealed space 517 is formed between the right end surface of the operation member 509 and the left end surface of the movable member 510 inside the insertion hole 507, and the hydraulic fluid is present in the sealed space. It is filled. Since the sealed space 517 includes the small diameter portion 508, the sealed space 517 is in communication with the first recess 503 via the communication hole 506. That is, the hydraulic oil is filled over the sealed space 517, the communication hole 506, and the first recess 503.

  Next, mounting of the tool 4 by this fixing mechanism will be described. First, the tool 4 is attached to the inner circumferential surface of the deformation member 502. Thereby, the inner peripheral surface of the deformation member 502 and the outer peripheral surface of the tool 4 are in close contact with each other. Next, as shown in FIG. 9, the work tool 520 is inserted from the left end of the insertion hole 507, and the work tool 520 is attached to the work tool recess 511 of the operation member 509. Then, the work tool 520 is rotated to rotate the operation member 509 about the axis. As a result, the male screw portion 512 is rotated together with the operation member 509, and the female screw portion 513 screwed to this is rotated. At this time, since the movable member 510 can not rotate around the axis by the projection 514, when the male screw portion 512 rotates, the operation member 509 and the movable member 510 move in the axial direction so as to approach each other. As a result, the volume of the enclosed space 517 is reduced, and the hydraulic oil is pressed. Thus, when the pressure of the hydraulic oil rises, the hydraulic oil presses the deformation member 502 through the communication hole 506 and the first recess 503. As a result, since the deformation member 502 presses the outer peripheral surface of the tool 4, the tool 4 is fixed to the deformation member 502.

  In addition, since the small diameter portion 508 is formed in the insertion hole 506, when the operation member 509 and the movable member 510 approach each other and contact with the small diameter portion 508, further proximity is restricted. That is, since the operation member 509 can not be rotated any more, the operator can recognize the end of the rotation of the operation member 509.

  On the other hand, when the operation member 509 is rotated to the opposite side by the work tool 520, the operation member 509 and the movable member 510 are separated. As a result, the volume of the sealed space 517 is increased, so that the pressure of the hydraulic oil is reduced, and the pressing of the tool 4 by the deformation member 502 is released. Thus, the tool 4 can be removed from the deformation member 502.

  Subsequently, the connecting member 252 disposed on the left side of the support main body 251 in the axial direction will be described. As shown in FIGS. 6 and 7, the connecting member 252 is connected to the axial left end of the support main body 251 so as to form the first discharge path 47 described above with the first bearing 241. A recess is formed on the right side. The outer peripheral surface of the connecting member 252 faces the motor housing space 26 described above, and an annular rotor 52 constituting the motor 5 is attached to the outer peripheral surface. Then, as shown in FIG. 6, the rotor 52 is opposed to the above-described stator 51 in the motor accommodation space 26.

  Next, the operation of the gear machining device configured as described above will be described. First, as shown in FIG. 1, the workpiece W on the placement table 800 disposed in the vicinity of the gear machining device is installed in the gear machining device by the robot arm 700. That is, in order to form a predetermined crossing angle on the workpiece W, first, the motor 2338 is driven to rotate the tool unit to a predetermined angle around the rotation axis S. Next, after the work W is attached to the shaft member 3101 of the headstock 31, the headstock 31 and the tailstock 32 are brought close to each other, and the work W is held. In this state, the shaft member 3101 of the headstock 31 is rotated together with the work W. At the same time, the motor 5 is driven to rotate the tool 4 of the tool unit 2 in synchronization with the workpiece W. Subsequently, the headstock 31 and the tailstock 32 are integrally moved in the Y-axis direction to bring the workpiece W close to the tool 4. Then, the work W is processed by meshing the work W with the tool 4 and bringing them into contact with each other. At this time, the rotation of each motor is controlled such that the rotation of the tool 4 and the workpiece W is synchronized by the detector 6 detecting the rotational angle position of the tool support 25. In addition, the housing 21 is moved in the Y-axis direction together with the support 23 as needed, and the workpiece W is crowned. At the same time as such a processing operation, cutting oil is injected to the meshing portion between the tool 4 and the work W to cool, lubricate, and remove chips from the processing site. Thus, after processing for a predetermined time, the drive of each motor is stopped and the processed work W is removed.

  As described above, in the present embodiment, the tool 4 is fixed by the above-described fixing mechanism. When fixing the tool 4, when the operation member 509 is rotated, the movable member 510 is also moved together with the operation member 509 so that both are close to each other. As a result, the pressure of the hydraulic oil is increased, and the deformation member 502 is pressed to fix the tool 4. Therefore, by operating the operation member 509, at the same time, the movable member 510 is also operated to apply pressure to the hydraulic fluid, so that the working time for increasing the pressure of the hydraulic fluid can be shortened. . As a result, the time of attachment of the tool 4 can be shortened.

  In addition, although the volume of the hydraulic fluid for deforming the deformable member 502 is predetermined, as described above, the volume of the hydraulic fluid compressed by one operation of the operation member 509 is twice that of the conventional example. Thus, the number of housings 501 in the fixing mechanism can be reduced.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to this, A various change is possible unless it deviates from the meaning. The following modifications can be combined as appropriate.

  For example, in the fixing mechanism according to the above embodiment, the small diameter portion 508 is provided to restrict the movement of the operation member 509. However, the small diameter portion 508 is not necessarily essential, and may not be provided.

  In the above embodiment, the movable member 510 is provided with the protrusion 514 so that the movable member 510 is not rotated about the axis, and the protrusion 514 is engaged with the groove 515 formed on the inner peripheral surface of the insertion hole 507 There is. However, the configuration of the restricting means for preventing the movable member 510 from rotating is not limited to this, and various configurations are possible.

  In the fixing mechanism of the above embodiment, a plurality of concave portions are provided in the central portion 2510 of the tool support 25, and the accommodating portions 501 are provided in each of the concave portions. That is, although the holding member of the present invention is constituted by a plurality of members, it can also be constituted integrally. That is, a plurality of insertion holes and communication holes can be formed in the annular holding member, and the operation member and the movable member can be arranged in each insertion hole.

  Although the fixing mechanism of the above embodiment is for fixing an annular internal gear-like tool, it is not limited to this, and a fixed object whose outer peripheral surface is cylindrical is pressed from outside in the radial direction and fixed If it does, it can employ | adopt suitably. Moreover, it is not limited to a cylindrical fixed object, It is applicable also to a polygonal-shaped fixed object.

  Although the fixing mechanism of the above embodiment presses the annular internal gear-like tool from the radial direction outward, it is an aspect to press the annular object to be fixed from the radial inward. Good. This point will be described with reference to FIG.

  The fixing mechanism shown in FIG. 10 includes a cylindrical holding member 801, and the holding member 801 is formed with an insertion hole 802 extending in the axial direction. The insertion hole 802 is formed to penetrate the holding member 801 in the axial direction, and a small diameter portion 803 having a small inner diameter is formed in the vicinity of the center in the axial direction. A plurality of communication holes 804 extending radially outward from the small diameter portion 803 are formed at predetermined intervals in the circumferential direction. Each communication hole 804 is opened at the outer peripheral surface of the holding member 801.

  In the outer peripheral surface of the holding member 801, a shallow first concave portion 805 is formed in a portion where the communication hole 804 is formed. The first recess 805 is annularly formed on the outer peripheral surface of the holding member 801. Then, deep annular second concave portions 806 are respectively formed at both axial ends of the first concave portions 805, and O rings 807 are attached to the respective second concave portions 806. Furthermore, a cylindrical deformation member 808 is attached to the outer peripheral surface of the holding member 801. The deformation member 808 is formed of the metal material or the like shown in the above embodiment. The operation member 809, the movable member 810, and the male screw portion 811 are disposed in the insertion hole 804, but they have the same configuration as the above embodiment. Further, the configuration for restricting the rotation of the movable member 810 is also the same as that of the above embodiment.

  A space surrounded by the operation member 809 and the movable member 810 in the insertion hole 802, a space surrounded by the communication hole 804, the first recess 805, the deformation member 808, and the O-ring 807 form a sealed space. The hydraulic oil is filled in this space.

  Although the fixing mechanism comprised as mentioned above fixes the cylindrical to-be-fixed thing 900 attached to the outer peripheral surface of the deformation member 808, the method of fixing is the same as the said embodiment. That is, by rotating the operation member 809 around the axis, the operation member 809 and the movable member 810 are brought close to each other, and the pressure of the hydraulic oil in the sealed space is increased. Thus, the hydraulic oil presses the deformation member 808 radially outward through the communication hole 804. As a result, the inner peripheral surface of the object to be fixed 900 is pressed from inside in the radial direction, and the object to be fixed 900 is fixed to the holding member 801.

  As described above, the fixing mechanism according to the present invention can also be applied to a fixing mode in which the inner peripheral surface of the cylindrical fixed object is pressed. The object to be fixed may have a shape other than a cylindrical shape, and the inner circumferential surface may have a polygonal shape in cross section.

4 Tool (fixed object)
501 Housing (holding member)
502 deformation member 506 communication hole 507 insertion hole 508 small diameter portion (stopper)
509 Operation member 510 Movable member 512 Male thread 514 Protrusion (regulating means)
515 Groove (regulating means)

Claims (4)

A holding member in which at least one insertion hole whose at least one end is opened to the outside and at least one communication hole extending to the outside from the inner wall surface of the insertion hole are formed;
In the one end side of each insertion hole of the holding member, it is movable in the axial direction of the insertion hole and rotatably disposed around the axial direction, and has a cylindrical shape having a first end and a second end. An operation member having a body portion formed, and an external thread portion axially extending from the first end of the body portion;
On the other end side of each insertion hole of the holding member, on the opposite side to the operation member across the communication hole, a female screw portion is arranged movably in the axial direction and screwed with the male screw portion A movable member,
Restricting means for restricting rotation of the movable member about the axial direction in the insertion hole;
A deformable deformation member which is held so as to close the communication hole on the outer surface of the holding member;
Equipped with
A fixing mechanism in which oil is filled between the operation member and the movable member and the communication hole in each of the insertion holes.   The fixing according to claim 1, wherein a stopper for restricting the approach of the operation member to the other end side is provided on the inner wall surface of each of the insertion holes on the one end side with respect to the communication hole. mechanism. The holding member is formed in a cylindrical shape, and a plurality of the insertion holes are formed,
The plurality of insertion holes are formed at predetermined intervals so as to open on any one side surface facing in the axial direction in the holding member,
A communication hole communicating with each of the insertion holes is formed to open at an inner peripheral surface of the holding member,
The fixing mechanism according to claim 1, wherein the deformation member is formed in a cylindrical shape that is disposed in close contact with an inner wall surface of the holding member so as to close the communication hole. The holding member is formed in a cylindrical shape,
A plurality of the communication holes are formed,
The insertion hole is formed so as to open on one of the side surfaces facing in the axial direction in the holding member,
The plurality of communication holes are formed to open at the outer peripheral surface of the holding member,
The fixing mechanism according to claim 1, wherein the deformation member is formed in a cylindrical shape that is disposed in close contact with an outer peripheral surface of the holding member so as to close the communication hole.