JP2008168403A - Bearing housing and circlip mounting method to bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To press-fit a bearing in a bearing housing without damaging a circlip and an outside ring groove. <P>SOLUTION: An expander 53 is rotated in the bearing housing H so that a regulating projection 53a comes to be at a central part of a cutout 7 accompanied by both tool engaging claws 7, 7 after engaging the regulating projection 53a projectively provided on an outside surface of the expander 53 between the both tool engaging claws 7, 7 in sinking the whole of the circlip in the outside ring groove 3 by extending the circlip C by the expander 53 inserted into the bearing housing H. The bearing is thereby press-fitted in the bearing housing by a press-fit punch without damaging the circlip and the outside ring groove. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  According to the present invention, a pair of tool engaging claws received in the notch is provided over an outer annular groove with a notch formed on the inner peripheral surface of the bearing housing and an inner annular groove formed on the outer peripheral surface of the bearing. When the circlip having the circlip is mounted, the circlip is inserted into the outer annular groove while the tool engaging claw is received in the notch, and the circlip is expanded by an extension, and the circlip is expanded. When the second step of immersing the clip in the outer annular groove, the third step of transferring the expanded circlip from the extension to the outer peripheral surface of the bearing, and the outer annular groove and the inner annular groove match, A fourth step in which the circlip is contracted by its own elastic force and engaged with the inner annular groove is sequentially executed, and the circlip is attached to the bearing housing and the bearing. Of an improvement.

Such a bearing housing and a method for attaching a circlip to the bearing are already known as disclosed in Japanese Patent Application Laid-Open No. H10-228707.
Japanese Patent Laid-Open No. 2003-165034

  Conventionally, in the bearing housing and the circlip attaching method to the bearing, when the second step is executed, the circlip is simply expanded by a plurality of extensions. Depending on the position in the annular groove, the inner corner of the base of the tool engaging claw may interfere with the opening edge of the notch, and the circlip may not completely enter the outer annular groove. If the process proceeds to step 3, and the bearing is press-fitted into the bearing housing by the press-fitting punch, the circlip and the outer annular groove may be damaged.

  The present invention has been made in view of such circumstances, and when the circlip is expanded by a plurality of extensions in the second step, the entire circlip can be surely immersed in the outer annular groove, In the next third step, an object of the present invention is to provide the bearing housing and the method of attaching the circlip to the bearing so that the bearing can be press-fitted into the bearing housing by a press-fitting punch without damaging the circlip or the outer annular groove. And

  In order to achieve the above-mentioned object, the present invention extends over a notched outer annular groove formed on the inner peripheral surface of the bearing housing and an inner annular groove formed on the outer peripheral surface of the bearing, and is received by the notch. When the circlip having a pair of tool engaging claws is attached, the circlip is inserted into the outer annular groove while the tool engaging claw is received in the notch, and the circlip by extension is used. A second step of expanding the clip and immersing the circlip into the outer annular groove; a third step of delivering the expanded circlip from the extension to the outer peripheral surface of the bearing; and the outer annular groove and the inner side. When the annular grooves coincide with each other, the bearing housing and the bearing are sequentially executed, wherein the circlip is reduced in diameter by its own elastic force and engaged with the inner annular groove. In the circlip attaching method to the groove, in the second step, the extension is adjusted so that the restricting projections protruding on the outer surface of the extension bring both tool engaging claws to the center of the notch. Rotating within the bearing housing is a first feature.

  According to the present invention, in addition to the first feature, in the second step, the extension initially brought into pressure contact with the inner peripheral surface of the circlip is changed from the initial position where the restricting projection is removed from the notch. The tool engaging pawl is in contact with one inner wall of the notch, and the restricting projection is rotated in a certain direction to a forward rotation stop position where the tool engaging pawl is engaged between the two tool engaging claws in the notch. According to a second feature of the present invention, the extension protrusion is rotated by a predetermined angle in a direction opposite to the previous time, so that the restricting projection is moved to the center of the notch with the two tool engaging claws.

  In addition to the second feature of the present invention, in the second step, in the second step, the extension is rotated in the constant direction from the initial position to the forward rotation stop position, and is rotated by the predetermined angle in the reverse direction. During the operation, the extension is expanded in a range in which the extension does not press against the inner peripheral surface of the bearing housing and presses against the inner peripheral surface of the circlip, and the extension extends from the forward rotation stop position in the reverse direction. A third feature is that an extension is extended so that the circlip is immersed in the outer annular groove at a position rotated by a predetermined angle.

  Furthermore, in addition to the second or third feature, the present invention provides that, in the second step, one of the tool engaging claws is rotated by rotating the extension in an expanded state from the initial position by a servo motor in a certain direction. Is brought into contact with one inner wall of the notch, and the restricting projection is engaged between both tool engaging claws in the notch. At this time, a sudden increase in the load of the servo motor is detected to detect the servo. The fourth feature is that the operation of the motor is stopped and then the servo motor is operated in reverse.

  The servo motor corresponds to a second servo motor 21 in an embodiment of the present invention described later.

  Furthermore, in addition to any one of the first to fourth features, the present invention provides a mechanism for engaging the extension restricting protrusion between the tool engaging claws in the notch in the second step. A fifth feature is that the elastic force of an elastic member that is interposed between the extension and the restriction protrusion and urges the restriction protrusion radially outward is used.

  The elastic member corresponds to a spring 68 in an embodiment of the present invention described later.

  According to the first feature of the present invention, in the second step, after the restricting protrusion protruding on the outer surface of one extension is engaged with the tool engaging claw of the circlip, the restricting protrusion is engaged with both tool engagements. Since the extension is rotated in the bearing housing so as to come to the center of the notch with the nail, the extension of the extension can surely insert the circlip into the outer annular groove, so that In the three steps, the bearing can be press-fitted into the bearing housing without damaging the circlip or the outer annular groove.

  According to the second feature of the present invention, in the second step, the extension press-contacted to the inner peripheral surface of the circlip is moved from the initial position where the restricting projection is removed from the notch, and the tool engaging claw is moved from the initial position. While abutting against one inner wall of the notch, the restricting protrusion rotates in a fixed direction to the forward rotation stop position where it engages between both tool engaging claws in the notch, and then the extension is in the direction opposite to the previous time. By rotating to a predetermined angle, both tool engaging claws can be reliably moved to the center of the notch.

  In addition to the second feature of the present invention, in the second step, in the second step, the extension is rotated in the constant direction from the initial position to the forward rotation stop position, and is rotated by the predetermined angle in the reverse direction. During the operation, the extension is expanded in a range in which the extension does not press against the inner peripheral surface of the bearing housing and presses against the inner peripheral surface of the circlip, and the extension extends from the forward rotation stop position in the reverse direction. A third feature is that an extension is extended so that the circlip is immersed in the outer annular groove at a position rotated by a predetermined angle.

  According to a third aspect of the present invention, in the second step, the extension is rotated in the constant direction from the initial position to the forward rotation stop position and is rotated in the reverse direction by the predetermined angle. Since the extension is expanded within the range where it does not press against the inner peripheral surface of the bearing housing and is pressed against the inner peripheral surface of the circlip, the friction resistance between the extension and the inner peripheral surface of the bearing housing, The circlip can reliably follow the rotation of the extension while avoiding frictional resistance between the clip and the outer annular groove bottom wall, and both tool engaging claws can be reliably moved to the center of the notch. .

  According to the fourth feature of the present invention, it is possible to automatically move the both tool engaging claws to the notch center by the servo motor.

  According to the fifth feature of the present invention, the extension state of the circlip and the engagement state of the restricting projection between the tool engagement claws are reliably made compatible by the extension, and the tool engagement claw is moved to the center of the notch. Can be reliably moved.

  Embodiments of the present invention will be described based on preferred embodiments of the present invention shown in the accompanying drawings.

  FIG. 1 is a longitudinal sectional view showing a bearing housing and a connecting structure of a bearing with a circlip, FIG. 2 is a view taken in the direction of arrow 2 in FIG. 1, and FIG. 3 is a circlip used for mounting the circlip to the bearing housing and the bearing. 4 is a sectional view taken along line 4-4 of FIG. 3, FIG. 5 is a perspective view of the main part of FIG. 4, FIG. 6 is a longitudinal sectional view of the peripheral portion of the bearing press-fitting punch, and FIG. 7 is a sectional view taken along line 7, FIG. 8 is a view taken in the direction of arrow 8 in FIG. 6, FIG. 9 is an explanatory diagram of the action of the extension, FIG. 10 is an explanatory diagram of the action of the extension and press-fitting punch, and FIG. FIG. 10 is a diagram corresponding to FIG. 9.

  First, referring to FIGS. 1 and 2, a connection structure between a bearing and a bearing housing by a circlip will be described. Reference numeral W is, for example, an automobile mission case, and the outer race 1 of the ball bearing B is press-fitted into a bearing housing H included therein. At that time, the outer annular groove 3 formed on the inner peripheral surface of the bearing housing H and the inner annular groove 4 formed on the outer peripheral surface of the outer race 1 in order to connect the bearing housing H and the outer race 1 to each other in the axial direction. Then, the circlip C is mounted. The circlip C is configured such that when the inner peripheral edge thereof is pressed against the bottom surface of the inner annular groove 4 with elastic contraction force, the outer peripheral edge remains in the outer annular groove 3. When the clip C is expanded, it has a depth that allows the entire clip C to be received. The circlip C has a pair of tool engaging claws 7 and 7 projecting outward in the radial direction so as to face each other with the joint 6 interposed therebetween, and an arcuate notch 5 for receiving these is provided in the bearing housing H. It is formed on the inner peripheral surface of. The pair of tool engaging claws 7 and 7 are used when the circlip C is expanded by applying an expansion tool to the claw clips 7, and when the circlip C is expanded, the circlip C is extended to the inner annular groove of the ball bearing B. 4, the ball bearing B can be removed from the bearing housing H. In the inner race 2 of the ball bearing B, for example, a transmission shaft such as a gear shift and output shaft is fitted.

  Now, a circlip mounting device D used for mounting the circlip C to the bearing housing H and the bearing B will be described with reference to FIGS.

  3 and 4, a casing 11 fixed to the base 10 includes a vertical guide rail 13 that supports the elevator 12 so that the elevator 12 can be moved up and down, and a ball screw mechanism 14 that raises and lowers the elevator 12. And a first servo motor 15 for driving the ball screw mechanism 14 is provided. The ball screw mechanism 14 includes a female screw member 18 fixed to the lifting platform 12 on a screw shaft 17 rotatably supported by a pair of upper and lower bearings 16 and 16 ′ fixed to a vertical partition wall 11 a in the casing 11. It is configured by screwing together. The first servo motor 15 is supported on a support plate 11b extending horizontally rearward from the lower end of the partition wall 11a, and an output shaft 15a protruding downward of the first servo motor 15 is connected to the first via the transmission device 19. It is connected to the lower end of the screw shaft 17. The transmission device 19 is configured as a belt type in the illustrated example, but may be configured as a gear type. Thus, if the screw shaft 17 is rotated forward and backward via the transmission 19 by the operation of the first servo motor 15, the lifting platform 12 can be moved up and down along the guide rail 13.

  A support cylinder 20 arranged in the vertical direction and a second servo motor 21 arranged in parallel to the support cylinder 20 are attached to the elevator board 12. The support cylinder 20 is rotatably supported by a hollow outer spindle 22, and an output shaft 21 a protruding downward from the second servo motor 21 and a lower end portion of the outer spindle 22 are connected via a timing transmission device 24. Is done. The timing transmission device 24 is configured as a gear type in the illustrated example, but can also be configured as a toothed belt type.

  An inner spindle 23 that passes vertically through the outer spindle 22 is spline-fitted. A lower flange 26 facing the lower end surface of the outer spindle 22 is attached to the lower end portion of the inner spindle 23, and a lower flange 26 facing the upper end surface of the outer spindle 22 is haptically attached to the upper end portion of the inner spindle 23. A set spring 27 is attached between the force sensor 28 and the outer spindle 22 and is attached via the sensor 28 and normally biases the inner spindle 23 upward to bring the lower flange 26 into contact with the lower end surface of the outer spindle 22. It is reduced. Thus, by operating the second servo motor 21, the outer spindle 22 can be rotated forward / reversely around the axis of the support cylinder 20 via the timing transmission device 24, and the inner spindle 23 spline-fitted to the outer spindle 22 can be simultaneously moved forward / reversely. Can be reversed. At this time, a torque greater than a predetermined value applied to the inner spindle 23 is detected by the force sensor 28, and the operation of the second servo motor 21 is controlled by the detection signal.

  Next, proceeding to FIGS. 4 and 5, the first support frame 30 is fixed to the upper end of the inner spindle 23, and the second support frame 31 is integrally connected to the first support frame 30 via a connecting member 34. Further, a third support frame 32 is integrally connected to the upper end of the second support frame 31. Accordingly, the first to third support frames 30 to 32 rotate with the inner spindle 23.

  A third servomotor 33 is attached to the ceiling plate 30 a of the first support frame 30. The ceiling plate 31a and the bottom plate 31b of the second support frame 31 are provided with a sliding bearing 35 and a rotary bearing 36 that are arranged coaxially with the inner spindle 23, respectively. The rotary bearing 36 rotatably supports a drive shaft 38 connected to the output shaft 33a of the third servo motor 33 via a coupling 37. The drive shaft 38 and the lifting shaft 39 are connected via a second ball screw mechanism 40. The second ball screw mechanism 40 is configured by screwing a screw shaft 41 integrally connected to the upper end of the drive shaft 38 into a screw hole 42 formed at the center of the elevating shaft 39. Thus, if the drive shaft 38, that is, the screw shaft 41 is moved forward and backward by the operation of the third servomotor 33, the elevating shaft 39 can be moved up and down.

  A pair of guide rails 45, 45 extending horizontally in parallel to each other are laid on the ceiling plate 32a of the third support frame 32, and a pair of extension blocks 46, 46 facing each other are slidable on the guide rails 45, 45. The expansion blocks 46 and 46 are connected to the elevating shaft 39 via an interlocking mechanism 47. The interlocking mechanism 47 is composed of a pair of bell cranks 49, 49 supported on a pair of opposite side walls 33b, 33b of the third support frame 32 via pivots 48, 48 so as to be swingable. The support holes 50 and 50 of the bell cranks 49 and 49 respectively supported by the pivot shafts 48 and 48 are formed as elongated holes extending in the horizontal direction, and allow the bell cranks 49 and 49 to move in the horizontal direction. Each bell crank 49 is composed of a first arm 49a whose tip is directed to the center between both pivot shafts 48, 48 and a second arm 49b whose tip is directed above the pivot shafts 48, 48. The distal ends of the first arms 49a, 49a of the 49, 49 are connected to the upper end of the lifting shaft 39 via a common first connecting pin 51, and the second arms 49b, 49b of both bell cranks 49, 49 are connected. The distal end portions are engaged with inverted U-shaped connecting grooves 52, 52 formed on the lower surfaces of the two expansion blocks 46, 46, respectively. Thus, according to the up / down movement of the lifting shaft 39, the pivot shafts 48, 48 are displaced in the horizontal direction, the bell cranks 49, 49 are swung, and the two expansion blocks 46, 46 are separated from each other. Can operate in the proximity direction.

  Extensions 53 and 54 are fixed to the upper ends of the expansion blocks 46 and 46 so as to contact the inner peripheral surface of the circlip C and expand it in the radial direction. As shown in FIG. 7, these extensions 53 and 54 have a long cross-sectional rectangle in the circumferential direction of the circlip C and extend the circlip C at two points on both ends thereof. Therefore, it is possible to cope with expansion of various circlips C having different diameters.

  At the center of the outer surface of one of the extensions 53, there is a restriction projection 53a extending from the inside of the circlip C in the vertical direction that can be engaged between the joint 6 of the circlip C, that is, between the tool engaging claws 7 and 7. It is attached. A structure for attaching the restriction projection 53a to the extension 53 will be described with reference to FIGS.

  A guide cylinder 61 is fixed to the inner surface of the extension 53 by a bolt 62, and is a piston having a circular cross section that is formed integrally with the cylinder hole 61a of the guide cylinder 61 on the back surface of the restricting projection 53a and penetrates the extension 53. 63 (see FIG. 8) is slidably fitted. The piston 63 has a key groove 64 (see FIG. 7) on the side surface, and a key 65 made of a bolt screwed to the guide cylinder 61 is engaged with the key groove 64 so that the piston 63 Has stopped. A lid plate 66 that closes the rear open end of the cylinder hole 61a is fixed to the guide cylinder 61 with a bolt 67. Between the lid plate 66 and the regulating projection 53a, the piston 63 passes through the regulating projection 53a. The spring 68 that springs outward is contracted. At that time, when the key 65 abuts against the rear end wall of the key groove 64, the limit of the outward protrusion of the restricting protrusion 53a by the spring 68 is defined.

  Hereinafter, the extension 53 having the restriction protrusion 53a is referred to as a first extension 53, and the extension 54 having no restriction protrusion 53a is referred to as a second extension 54.

  As shown in FIG. 6, a work support base 55 is disposed above the first and second extensions 53 and 54, and on this work support base 55, the bearing housing H is coaxial with the lift shaft 39. The mission case W is supported so as to be arranged. Further, a press-fitting punch 57 that moves up and down on the same axis as the lifting shaft 39 is disposed further above the work support base 55. The press-fitting punch 57 presses the outer race 1 of the ball bearing B and press-fits it into the bearing housing H, and is connected to a lifting ram of a press-fitting machine (not shown).

  A bearing holding shaft 58 projects from the center of the lower end of the press-fitting punch 57. The bearing holding shaft 58 has an annular groove 59 on the outer periphery, and a piston ring that holds the ball bearing B by frictional force by elastically engaging with the inner peripheral surface of the inner race 2 of the ball bearing B. A shaped retaining ring 60 is fitted.

  Next, the operation of this embodiment will be described.

  First, as shown in FIG. 6, with the press-fitting punch 57 held at a raised position above the bearing housing H, the transmission case W is placed at a fixed position on the work support base 55, and the bearing housing H is moved up and down. It is arranged coaxially with the shaft 39. The circlip C is inserted into the outer annular groove 3 of the bearing housing H, and the pair of tool engaging claws 7 and 7 are received in the notch 5 of the outer annular groove 3. In the free state of the circlip C, its outer diameter is larger than the inner diameter of the bearing housing H and smaller than the diameter of the outer annular groove 3, and its inner diameter is smaller than the inner diameter of the bearing housing H.

  On the other hand, the inner race 2 of the ball bearing B is fitted to the bearing holding shaft 58 of the press-fitting punch 57 held in the raised position, and is held by friction with the O-ring 60, and the upper end surface of the outer race 1. Is brought into contact with the lower end surface of the press-fitting punch 57.

  Next, the elevator 12 is raised by the operation of the first servo motor 15, and the contracted first and second extensions 53 and 54 are inserted into the circlip C as shown in FIG. . At this time, the second servo motor 21 first rotates the inner spindle 23 so that the restricting projection 53a of the first extension 53 comes to a predetermined initial position a that is deviated from the notch 5 by a certain angle.

  Next, the lift shaft 39 is raised by the operation of the third servo motor 33, and both extensions 53 and 54 are expanded as shown in FIG. The entire circlip C is completely pushed into the outer annular groove 3 by pressing. At this time, the restricting projection 53a of the second extension 54 contacts the inner peripheral surface of the circlip C to hold the spring 68 in a compressed state.

  After that, the first to third rotation support frames 30 to 32 are rotated in a certain direction R <b> 1 by the operation of the second servomotor 21. Then, both extensions 53 and 54 initially rotate in the same direction R1 along with the circlip C. However, as shown in FIG. 9C, the tool engaging claw on the front side of the rotation direction R1 of the circlip C When 7 reaches the position b where it abuts against the inner surface of the notch 5, the rotation of the circlip C is prevented, and only the extensions 53 and 54 further rotate while sliding on the inner peripheral surface of the circlip C.

  Then, as shown in FIG. 9D, as soon as the restricting projection 53 a of the first extension 53 comes to the position between the two tool engaging claws 7, 7, the restricting projection 53 a is externally moved by the compression repulsive force of the spring 68. Projecting in the opposite direction and engaged between the two tool engaging claws 7 of the circlip C.

  Both extensions 53 and 54 engage the restricting projection 53a between the two tool engaging claws 7 and 7 so that the tool engaging claw 7 in front of the rotation direction R1 contacts the corresponding inner surface of the notch 5. Then, the load of the second servo motor 21 increases rapidly, and a torque greater than a predetermined value is applied to the inner spindle 23. Therefore, the force sensor 28 detects the torque greater than the predetermined value, and the detection signal is sent to the second signal. Input to the servo motor 21. Then, the second servomotor 21 immediately reversely rotates, as shown in FIG. 9 (E), both extensions 53 and 54 are moved in the reverse direction R2 together with the circlip C, and the restricting projection 53a is formed in the notch 5. A predetermined angle is rotated to a predetermined position c occupying a substantially central position.

  In this way, the restricting projection 53a engaged between the two tool engaging claws 7 and 7 is held at the predetermined position c, so that both the tool engaging claws 7 and 7 are also held and held at substantially the center position of the notch 5. Will be. Thus, interference between the inner corners of the bases of the first and second tool engaging claws 7 and 7 and the opening edge of the notch 5 is avoided, and the entire circlip C is reliably pushed into the outer annular groove 3. Can do.

  Then, as shown in FIG. 10A, when the press-fitting punch 57 is lowered and the outer race 1 of the ball bearing B held on the bearing holding shaft 58 is press-fitted into the bearing housing H, Accordingly, the outer race 1 abuts against the upper ends of the first and second extensions 53 and 54 in the expanded state and presses them downward. The pressing force applied to the extensions 53 and 54 of the press-fitting punch 57 is transmitted to the second and first support frames 31 and 30 via the interlocking mechanism 47, the elevating shaft 39 and the ball screw mechanism 40, and the set spring 27 is Since the outer race 1 is pressed by the press-fitting punch 57, the outer race 1 is lowered together with the extensions 53 and 54.

  As shown in FIG. 10 (B), when both extensions 53 and 54 are separated downward from the expanded circlip C, the circlip C is the outer periphery of the outer race 1 that continues to the upper ends of the expanded claws 7 and 7. Passed to the face. That is, as described above, the first and second tool engaging claws 7 and 7 are held in the center portion of the notch 5, so that the entire circlip C is formed in an outer annular shape by the two extensions 53 and 54 in the expanded state. The outer race 1 fits smoothly into the inner peripheral surface of the circlip C as both extensions 53 and 54 slide downward on the inner peripheral surface of the circlip C because they are completely pushed into the groove 3. be able to.

  Subsequently, as shown in FIG. 10C, when the inner annular groove 4 of the outer race 1 comes to the position of the circlip C, the circlip C contracts with its own elastic force and engages with the inner annular groove 4. Will match. Thus, the circlip C is mounted from the outer annular groove 3 to the inner annular groove 4, and the press-fitting operation of the ball bearing B into the bearing housing H is completed.

  After that, the lift shaft 39 is lowered by the operation of the third servo motor 33 to contract both the extensions 53 and 54, and then the lift base 12 is lowered by the operation of the first servo motor 15, , 54 is returned to the original position below the mission case W, while the press-fitting punch 57 is raised, and the mission case W equipped with the ball bearing B is removed from the work support base 55.

  Next, another embodiment of the present invention shown in FIG. 11 will be described.

  In this alternative embodiment, as shown in FIG. 11 (A), the elevator 12 is first raised by the operation of the first servo motor 15, and the first and second extensions 53, 54 in the contracted state are moved to the circlip. While being inserted into C, the inner servo 23 is rotated so that the regulation protrusion 53a of the first extension 53 comes to a predetermined initial position a which is deviated from the notch 5 by a certain angle by the operation of the second servo motor 21. The step to be performed is the same as the step shown in FIG. 9A of the previous embodiment.

  Next, as shown in FIG. 11 (B), the extensions 53 and 54 are not pressed against the inner peripheral surface of the bearing housing H by adjusting the rising stroke of the lifting shaft 39 by the operation of the third servo motor 33. Both extensions 53 and 54 are expanded in the range and are pressed against the inner peripheral surface of the circlip C. Therefore, at this stage, the circlip C is not completely pushed into the outer annular groove 3. Further, the restricting projection 53a of the first extension 53 that is in pressure contact with the inner peripheral surface of the circlip C compresses the spring 68 so that both ends of the first extension 53 abut against the inner peripheral surface of the circlip C. The piston 63 is moved backward.

  The subsequent steps of FIGS. 11C and 11D proceed in the same way as the steps of FIGS. 9C and 9D of the previous embodiment, and as shown in FIG. Until the restricting projection 53a engaged between 53 and 54 is carried to a predetermined position c occupying the substantially central position of the notch 5, the non-pressure contact state is maintained on the inner peripheral surface of the bearing housing H of both the extensions 53 and 54. To do. In this way, both the circlip C are expanded while avoiding the frictional resistance between the extensions 53 and 54 and the inner peripheral surface of the bearing housing H and the frictional resistance between the circlip C and the outer annular groove 3 bottom wall. The control protrusion 53a engaged between the extensions 53 and 54 can be reliably moved to the predetermined position c that occupies the approximate center position of the notch 5 by reliably following the rotation of the child 53 and 54.

  In this embodiment, since the pressure contact force of the extensions 53 and 54 to the inner peripheral surface of the circlip C is relatively weak, the circuit between the step of FIG. 11B and the step of FIG. Before the tool engaging claw 7 on the front side in the rotation direction R1 of the clip C comes into contact with the inner surface of the notch 5, the extensions 53 and 54 rotating in the R1 direction slide with respect to the circlip C and the restriction projection 53a is formed. The spring 68 may be engaged between the two tool engaging claws 7 and 7 of the circlip C. In this case, the extensions 53 and 54 rotate in the R1 direction in the engaged state. 11 (D), so there is no inconvenience. Therefore, thereafter, as in the case of the previous embodiment, both extensions 53 and 54 are rotated together with the circlip C by a predetermined angle in the reverse direction R2 to a predetermined position c from FIG. 11 (D) to FIG. 11 (E). By doing so, the restricting projection 53a engaged between the extensions 53 and 54 can be carried to the substantially center position of the notch 5.

  Thus, when the restricting projection 53a engaged between the extensions 53 and 54 comes to the predetermined position c occupying the substantially center position of the notch 5, as shown in FIG. When the lifting shaft 39 is sufficiently raised by the operation, the extensions 53 and 54 are expanded until the extensions 53 and 54 come into contact with the inner peripheral surface of the bearing housing H, and the entire circlip C is formed in the outer annular groove 3. Push it firmly into. Subsequent work steps are the same as in the previous embodiment, and a description thereof will be omitted.

  The present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the invention. For example, when the third servo motor 33 itself has a function capable of detecting a torque greater than a predetermined value applied to the inner spindle 23, the force sensor 28 can be omitted.

The longitudinal section which shows the connection structure of the bearing housing and bearing by a circlip. FIG. The side view of the circlip mounting apparatus used for mounting to the bearing housing and bearing of the said circlip. FIG. 4 is a sectional view taken along line 4-4 of FIG. The principal part perspective view of FIG. The longitudinal cross-sectional view of a bearing press-fit punch peripheral part. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. FIG. 8 is a view taken in the direction of arrow 8 in FIG. 6. Explanatory drawing of action of extension. Explanatory drawing of an effect | action of an extension and a press-fitting punch. FIG. 10 is a diagram corresponding to FIG. 9 showing another embodiment of the present invention.

Explanation of symbols

B ... Bearing (ball bearing)
C ... Circlip H ... Bearing housing 3 ... Outer annular groove 4 ... Inner annular groove 5 ... Notch 7 ... Tool Joint claw 28... Force sensor 53... Extension 53 a with restriction projection .. Restriction projection 68... Elastic member (spring)

Claims (5)

The notch is formed over an outer annular groove (3) with a notch (5) formed on the inner peripheral surface of the bearing housing (H) and an inner annular groove (4) formed on the outer peripheral surface of the bearing (B). When the circlip (C) having a pair of tool engaging claws (7, 7) received in (5) is attached, the circlip (C) is attached to the tool engaging claws (7, 7). The circlip (C) is expanded by the first step of inserting into the outer annular groove (3) while being accommodated in the notch (5), and the extension (53), and the circlip (C) is inserted into the outer annular groove. A second step of immersing in (3), a third step of transferring the expanded circlip (C) from the extension (53) to the outer peripheral surface of the bearing (B), and the outer annular groove (3) When the inner annular groove (4) is aligned, the circlip (C) is Reduced in diameter by the elastic force of itself sequentially executes a fourth step of engaging said inner annular groove (4), in circlip mounting method of the bearing housing and the bearing,
In the second step, the restricting protrusion (53a) protruding from the outer surface of the extension (53) brings the both tool engaging claws (7, 7) to the center of the notch (5). The extension (53) is rotated in the bearing housing (H), and a bearing housing and a method of attaching a circlip to the bearing are provided. In the bearing housing and the circlip attachment method to a bearing according to claim 1,
In the second step, the extension (53) initially brought into pressure contact with the inner peripheral surface of the circlip (C) is moved to the initial position (a) where the restricting projection (53a) is disengaged from the notch (5). The one tool engaging claw (7) comes into contact with one inner wall of the notch (5), and the restricting projection (53a) is connected to both tool engaging claws (7, 7) in the notch (5). 7) Rotate in a fixed direction (R1) to the forward rotation stop position (b) engaged between them, and then rotate the extension (53) in a direction (R2) opposite to the previous time by a predetermined angle (b to c). Thus, the circlip to the bearing housing and the bearing is characterized in that the restricting projection (53a) is moved to the center of the notch (5) with the both tool engaging claws (7, 7). Wearing method. In the bearing housing and the circlip attachment method to a bearing according to claim 2,
In the second step, the extension (53) is rotated in the constant direction (R1) from the initial position (a) to the forward rotation stop position (b), and the predetermined direction in the reverse direction (R2). During the rotation of the angle (b to c), the extension (53) is expanded so that it does not press against the inner peripheral surface of the bearing housing (H), and is pressed against the inner peripheral surface of the circlip (C). The circlip (C) is inserted into the outer annular groove (3) at a position where the extension (53) is rotated by the predetermined angle (bc) in the reverse direction (R2) from the forward rotation stop position (b). A bearing housing and a method of attaching a circlip to the bearing, wherein the extension (53) is extended so as to be immersed. In the bearing housing of Claim 2 or 3, and the circlip attachment method to a bearing,
In the second step, the extension (53) in the expanded state is rotated from the initial position (a) to a fixed direction (R1) by the servo motor (21), and one tool engaging claw (7) is While making contact with one inner wall of the notch (5), the restricting projection (53a) is engaged between both tool engaging claws (7, 7) in the notch (5). A bearing housing and a circlip to a bearing, characterized by detecting a sudden increase in load of the servo motor (21), stopping the operation of the servo motor (21), and then reversely operating the servo motor (21). Wearing method. In the bearing housing in any one of Claims 1-4, and the circlip attachment method to a bearing,
When the restricting protrusion (53a) of the extension (53) is engaged between the tool engaging claws (7, 7) in the notch (5) in the second step, the extension (53) And an elastic member (68) interposed between the restricting protrusions (53a) and urging the restricting protrusions (53a) radially outward, to a bearing housing and a bearing How to install a circlip.

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