Caulking device

Abstract

To provide a caulking device capable of performing appropriate caulking by positioning a caulking projection at the center of a caulking groove of a screw shaft without depending on the skill of a worker.SOLUTION: The swaging device 1 includes the jig body 10, the first pin 11 that has the key 11a fittable into the key hole 73 of the screw shaft 71 at the distal end portion and is inserted into the jig body 10 so as to be movable forward and backward in the central-axis C direction of the jig body 10, and the swaging projection 22 that projects from the jig body 10 and is positioned at the center of the swaging groove 72 when the key 11a is fitted into the key hole 73.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a crimping device for preventing a nut from rotating on a screw shaft. [Background technology]

[0002] For example, when fastening a wheel hub to a drive shaft of a vehicle, a nut is crimped onto the threaded shaft of the drive shaft. Such crimping of nuts is generally performed manually by an operator using a dedicated crimping tool or the like.

[0003] Various proposals have been made for such crimping jigs. For example, Patent Document 1 discloses a nut crimping tool (crimping jig) that includes a center shaft that is inserted into the axial center of the tip of a shaft member (screw shaft) and is movable back and forth in the axial direction, and a tapered protrusion that deforms the cylindrical portion of the nut and crimps it into the crimping groove of the screw shaft. With the crimping jig of Patent Document 1, the center shaft is inserted into the center hole of the screw shaft, making it possible to position the tapered protrusion in the outer diameter direction of the screw shaft. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 6-41928 Summary of the Invention [Problem to be solved by the invention]

[0005] However, even when the crimping jig of Patent Document 1 is used, the positioning of the tapered protrusion in the circumferential direction of the screw shaft must depend on the skill of the worker. Therefore, arranging the tapered protrusion in the center of the crimping groove of the screw shaft requires the skill of the worker. Furthermore, if the tapered protrusion is arranged in a position displaced from the center of the groove of the screw shaft, there is a risk of cracks occurring in the crimped portion formed by the crimping protrusion.

[0006] An object of the present invention is to provide a crimping device that can position a crimping protrusion in the center of a crimping groove on a screw shaft and perform appropriate crimping without relying on the skill of an operator. [Means for solving the problem]

[0007] A crimping processing device according to one embodiment of the present invention is a crimping processing device for crimping a part of a nut inside a crimping groove of a screw shaft having a keyhole on its end surface, and comprises a jig body, a first pin having a key at its tip that can fit into the keyhole and inserted into the jig body so as to be movable back and forth in the central axis direction of the jig body, and a crimping protrusion that protrudes from the jig body and is positioned in the center of the crimping groove when the key is fitted into the keyhole. [Effects of the Invention]

[0008] According to the crimping device of the present invention, it is possible to position the crimping protrusion in the center of the crimping groove of the screw shaft and perform appropriate crimping without relying on the skill of the worker. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing a main part of a wheel support mechanism; [Figure 2] FIG. 1 is an exploded perspective view showing a main part of a wheel support mechanism; [Figure 3] FIG. 1 is a perspective view showing a wheel hub fastened to a drive shaft. [Figure 4] FIG. 1 is a perspective view showing a screw shaft and a nut of a drive shaft; [Figure 5] Schematic diagram of the crimping device [Figure 6] Operational diagram of the crimping device [Figure 7] Operational diagram of the crimping device [Figure 8] FIG. 1 is a perspective view showing a crimping jig of a crimping device; [Figure 9] Flowchart showing the operation routine of the crimping device [Figure 10] 10 is a schematic diagram of a crimping device according to a modified example. [Figure 11] 10 is a diagram illustrating the operation of a crimping jig according to a modified example. [Figure 12] 10 is a diagram illustrating the operation of a crimping jig according to a modified example. [Figure 13] 10 is a diagram illustrating the operation of a crimping jig according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, one embodiment of the present invention will be described with reference to FIGS.

[0011] Prior to describing the crimping device 1 of this embodiment, a schematic configuration of a wheel support mechanism 50, which is an example of an application of the crimping device 1, will be described with reference to FIGS.

[0012] The wheel support mechanism 50 includes a steering knuckle 51 , a wheel hub unit 52 , and a drive shaft 53 .

[0013] The steering knuckle 51 has a plurality of arms 55 and a bearing insertion hole 56 .

[0014] Each arm 55 is connected to a suspension arm, a suspension device, etc. (not shown).

[0015] The bearing insertion hole 56 is configured, for example, as a cylindrical hole that passes through the steering knuckle 51 in the vehicle width direction.

[0016] The wheel hub unit 52 includes a wheel hub 60 and a bearing 61 .

[0017] The wheel hub 60 has a shaft support tube 65 and a flange 66 .

[0018] The shaft support cylinder 65 has a substantially cylindrical shape and has an inner diameter large enough to insert the drive shaft 53. The shaft support cylinder 65 also has a plurality of spline grooves 65a on its inner circumferential surface.

[0019] The flange 66 is provided on the outer periphery of the shaft support cylinder 65. The flange 66 has a plurality of bolt insertion holes 66a for fastening and connecting a brake disc (not shown) and a wheel of a vehicle.

[0020] The bearing 61 is connected to the wheel hub 60. The bearing 61 is rotatable relative to the wheel hub 60. The bearing 61 is inserted into the bearing insertion hole 56 of the steering knuckle 51. Furthermore, the bearing 61 is fixed to the steering knuckle 51 using a bolt (not shown). As a result, the bearing 61 supports the wheel hub 60 on the steering knuckle 51.

[0021] The drive shaft 53 has a spline 70 and a threaded shaft 71 at its tip. The spline 70 is spline-connected to a spline groove 65a in the wheel hub 60. This enables the drive shaft 53 to transmit the driving force of an engine or the like to the wheel hub 60. A nut 75 is threadedly engaged with the threaded shaft 71. This connects the drive shaft 53 to the wheel hub 60.

[0022] Here, for example, as shown in FIG. 4, the screw shaft 71 has a crimping groove 72 at its tip. Furthermore, the screw shaft 71 has a keyhole 73 on its tip surface. The crimping groove 72 is formed by cutting out a part of the tip of the screw shaft 71. The keyhole 73 is configured as, for example, an elongated hole. This keyhole 73 is provided, for example, at a position away from the central axis C of the screw shaft 71.

[0023] The nut 75 also has a cylindrical portion 76 at its top. After the nut 75 is threaded onto the screw shaft 71, a portion of this cylindrical portion 76 is crimped into the crimping groove 72 (see FIG. 3). As a result, a crimped portion 76a is formed in part of the cylindrical portion 76, which is plastically deformed by the crimping. This crimped portion 76a restricts the rotation of the nut 75 relative to the screw shaft 71. As a result, the crimped portion 76a prevents the nut 75 from falling off the screw shaft 71.

[0024] The crimping process for such a nut 75 is performed using a crimping device 1. The crimping device 1 has a crimping jig 5 and an impact generating device 6.

[0025] The crimping jig 5 has a jig body 10, a first pin 11, a second pin 12, a first light-emitting element 13, a second light-emitting element 14, a first light-receiving element 15, and a second light-receiving element 16.

[0026] The jig body 10 has a generally cylindrical shape and includes a connecting shaft 20, a socket 21, a crimping projection 22 as a projection, a first pin hole 23, a second pin hole 24, a first through hole 25, and a second through hole 26.

[0027] The connecting shaft 20 is provided on the base end side of the jig body 10. This connecting shaft 20 is a shaft for connecting the crimping jig 5 to the impact generating device 6 in a detachable manner.

[0028] The socket 21 is provided on the tip side of the jig body 10. The socket 21 has a shape that can surround the outer periphery of the cylindrical portion 76 of the nut 75.

[0029] The crimping protrusion 22 protrudes from the inner peripheral surface of the socket 21 in the radially inward direction of the socket 21. The crimping protrusion 22 is disposed in a position where it can press a portion of the cylindrical portion 76 of the nut 75 from the outer peripheral side when the socket 21 surrounds the outer periphery of the cylindrical portion 76. This allows the crimping protrusion 22 to plastically deform a portion of the cylindrical portion 76 in the radially inward direction.

[0030] The first pin hole 23 extends in the direction of the central axis C of the jig body 10. The first pin hole 23 is open at the tip end side of the jig body 10. The first pin hole 23 is closed at the base end side of the jig body 10. The first pin hole 23 is disposed at a position where the opening of the first pin hole 23 can face the key hole 73 of the screw shaft 71. In other words, when the socket 21 surrounds the outer periphery of the cylindrical portion 76, the opening of the first pin hole 23 can face the key hole 73 of the screw shaft 71. A first return spring 27 is disposed deep inside the first pin hole 23.

[0031] The second pin hole 24 extends in the direction of the central axis C of the jig body 10. The second pin hole 24 opens at the tip end side of the jig body 10. The second pin hole 24 closes at the base end side of the jig body 10. The second pin hole 24 is disposed at a position where the opening of the second pin hole 24 can face the end face of the screw shaft 71. In other words, when the socket 21 surrounds the cylindrical portion 76, the opening of the second pin hole 24 can face the end face of the screw shaft 71. A second return spring 28 is disposed deep inside the second pin hole 24.

[0032] The first through hole 25 penetrates the jig body 10 in a direction intersecting the central axis C of the jig body 10. More specifically, the first through hole 25 penetrates the jig body 10 in a direction perpendicular to the central axis C of the jig body 10. Furthermore, the middle of the first through hole 25 communicates with the middle of the first pin hole 23 and the middle of the second pin hole 24, respectively.

[0033] The second through hole 26 penetrates the jig body 10 in a direction intersecting the central axis C of the jig body 10. More specifically, the second through hole 26 penetrates the jig body 10 in a direction perpendicular to the central axis C of the jig body 10. Furthermore, the middle of the second through hole 26 communicates with the middle of the first pin hole 23 and the middle of the second pin hole 24. Note that the second through hole 26 is disposed, for example, closer to the base end than the first through hole 25 in the direction of the central axis C of the jig body 10.

[0034] The first pin 11 is inserted into the first pin hole 23. This first pin 11 is movable back and forth along the central axis C of the jig body 10. More specifically, the first pin 11 is biased toward the tip of the jig body 10 by a first return spring 27. This causes the tip of the first pin 11 to protrude from the first pin hole 23. When a load toward the base end of the jig body 10 is applied to the tip of the first pin 11, the tip of the first pin 11 can retreat into the first pin hole 23.

[0035] Such a first pin 11 has a key 11a at its tip. The key 11a has a shape that allows it to fit into the key hole 73. When this key 11a is fitted into the key hole 73, the key 11a positions the crimping protrusion 22 at the center of the crimping groove 72 in the width direction.

[0036] The first pin 11 also has a third through hole 30 and a fourth through hole 31 midway along its length.

[0037] The third through hole 30 penetrates the first pin 11 in a direction intersecting the central axis C of the jig body 10. More specifically, the third through hole 30 penetrates the first pin 11 in a direction perpendicular to the central axis C of the jig body 10. This third through hole 30 is located at a position communicating with the first through hole 25 when the jig body 10 is located at a position where the key 11a is fitted into the keyhole 73 and the crimping projection 22 is in contact with the cylindrical portion 76 (see FIG. 6).

[0038] The fourth through hole 31 penetrates the first pin 11 in a direction intersecting the central axis C of the jig body 10. More specifically, the fourth through hole 31 penetrates the first pin 11 in a direction perpendicular to the central axis C of the jig body 10. This fourth through hole 31 is located at a position communicating with the second through hole 26 when the key 11a is fitted into the keyhole 73 and the jig body 10 is located at a position where the crimping process of the cylindrical portion 76 by the crimping projection 22 has ended (see FIG. 7).

[0039] The second pin 12 is inserted into the second pin hole 24. This second pin 12 is movable back and forth along the central axis C of the jig body 10. More specifically, the second pin 12 is biased toward the tip of the jig body 10 by a second return spring 28. This causes the tip of the second pin 12 to protrude from the second pin hole 24. When a load is applied to the tip of the second pin 12 toward the base end of the jig body 10, the tip of the second pin 12 can retract into the second pin hole 24.

[0040] The tip end surface of the second pin 12 is set as a contact surface 12 a that can come into contact with the end surface of the screw shaft 71 .

[0041] The second pin 12 also has a fifth through hole 32 and a sixth through hole 33 midway along its length.

[0042] The fifth through hole 32 penetrates the second pin 12 in a direction intersecting the central axis C of the jig body 10. More specifically, the fifth through hole 32 penetrates the second pin 12 in a direction perpendicular to the central axis C of the jig body 10. This fifth through hole 32 is disposed at a position communicating with the first through hole 25 when the jig body 10 is disposed at a position where the abutment surface 12a abuts against the end face of the screw shaft 71 and the crimping projection 22 abuts against the cylindrical portion 76 (see FIG. 6).

[0043] The sixth through hole 33 penetrates the second pin 12 in a direction intersecting the central axis C of the jig body 10. More specifically, the sixth through hole 33 penetrates the second pin 12 in a direction perpendicular to the central axis C of the jig body 10. The sixth through hole 33 is positioned so as to communicate with the second through hole 26 when the abutment surface 12a abuts against the end face of the screw shaft 71 and the jig body 10 is positioned at the end position of the crimping process of the cylindrical portion 76 by the crimping protrusion 22 (see FIG. 7).

[0044] The first light emitting element 13 is provided on one end side of the first through hole 25. The first light emitting element 13 emits, for example, laser light toward the inside of the first through hole 25.

[0045] The second light emitting element 14 is provided on one end side of the second through hole 26. The second light emitting element 14 emits, for example, laser light toward the inside of the second through hole 26.

[0046] The first light-receiving element 15 is provided on the other end side of the first through-hole 25. That is, the first light-receiving element 15 faces the first light-emitting element 13 via the first pin 11 and the second pin 12. The first light-receiving element 15 functions as a first state detection sensor together with the first light-emitting element 13. Specifically, the first light-receiving element 15 receives the laser light emitted from the first light-emitting element 13 only when the third through-hole 30 and the fifth through-hole 32 are in communication with the first through-hole 25 (see FIG. 6). Upon receiving the laser light, the first light-receiving element 15 outputs a first signal. This allows the first light-receiving element 15 to detect a first state in which the crimping protrusion 22 is positioned at the center of the crimping groove 72 in the width direction and has reached the crimping start position for the cylindrical portion 76.

[0047] The second light-receiving element 16 is provided on the other end side of the second through-hole 26. That is, the second light-receiving element 16 faces the second light-emitting element 14 via the first pin 11 and the second pin 12. The second light-receiving element 16 functions as a second state detection sensor together with the second light-emitting element 14. Specifically, the second light-receiving element 16 receives the laser light emitted from the second light-emitting element 14 only when the third through-hole 30 and the sixth through-hole 33 are in communication with the second through-hole 26 (see FIG. 7). Upon receiving the laser light, the second light-receiving element 16 outputs a second signal. This allows the second light-receiving element 16 to detect a second state in which the crimping protrusion 22 is positioned at the center of the crimping groove in the width direction and the crimping protrusion 22 has reached the end position of crimping to the cylindrical portion 76.

[0048] The impact generating device 6 includes a vibration source 40 and an electronic control unit (ECU) 41.

[0049] The vibration source 40 is configured to include a motor and the like (not shown). The vibration source 40 generates vibration in the direction of the central axis C of the crimping jig 5. The vibration generated by the vibration source 40 is transmitted to the crimping jig 5.

[0050] All or part of the ECU 41 is configured by a processor including hardware. Here, the processor is configured by well-known components including, for example, a central processing unit (CPU), random access memory (RAM), read-only memory (ROM), non-volatile memory, non-volatile storage, and non-transitory computer readable medium, as well as peripheral devices thereof. The ROM, non-volatile memory, non-volatile storage, etc. store software programs to be executed by the CPU and fixed data such as data tables. The CPU reads the software programs stored in the ROM, expands them into the RAM, and executes them. The software programs also refer to various data as appropriate, thereby realizing the functions of the above-mentioned components and units.

[0051] The ECU 41 controls the driving of the vibration source 40 based on signals from the first light receiving element 15 and the second light receiving element 16. Specifically, the ECU 41 starts driving the vibration source 40 when a first signal is input from the first light receiving element 15. Furthermore, the ECU 41 stops driving the vibration source 40 when a second signal is input from the second light receiving element 16.

[0052] Next, the drive control of the vibration source 40 by the ECU 41 will be described with reference to the flowchart of Fig. 9. This routine is executed, for example, in the process of moving the crimping jig 5, with the key 11a fitted in the keyhole 73, toward the screw shaft 71.

[0053] When the routine starts, in step S101, the ECU 41 checks whether the first signal is input from the first light receiving element 15 or not.

[0054] If it is determined in step S101 that the first signal has not been input, the ECU 41 remains in standby mode.

[0055] On the other hand, if it is determined in step S101 that the first signal has been input, the ECU 41 proceeds to step S102.

[0056] In step S102, the ECU 41 starts driving the vibration source 40.

[0057] In the following step S103, the ECU 41 checks whether the second signal is input from the second light receiving element 16 or not.

[0058] If it is determined in step S103 that the second signal has not been input, the ECU 41 remains in standby mode.

[0059] On the other hand, if it is determined in step S103 that the second signal has been input, the ECU 41 proceeds to step S104.

[0060] In step S104, the ECU 41 stops the vibration source 40 and then exits the routine.

[0061] According to this embodiment, the crimping processing device 1 comprises a jig body 10, a first pin 11 having a key 11a at its tip that can fit into the key hole 73 of the screw shaft 71 and inserted into the jig body 10 so as to be movable back and forth in the direction of the central axis C of the jig body 10, and a crimping protrusion 22 that protrudes from the jig body 10 and is positioned in the center of the crimping groove 72 when the key 11a is fitted into the key hole 73.

[0062] This allows the crimping protrusion 22 to be positioned in the center of the crimping groove 72 of the screw shaft 71 and appropriate crimping to be performed without relying on the skill of the worker. That is, the worker can easily position the crimping protrusion 22 in the center of the crimping groove 72 simply by fitting the key 11a into the keyhole 73.

[0063] In this case, the crimping processing device 1 further includes a first through hole 25 and a second through hole 26 provided in the jig body 10 and intersecting with the first pin 11, and a third through hole 30 and a fourth through hole 31 provided in the first pin 11.

[0064] The third through hole 30 is set to communicate with the first through hole 25 when the key 11a is fitted into the key hole 73 and the jig body 10 is positioned so that the crimping protrusion 22 abuts against the cylindrical portion 76 of the nut 75.

[0065] In addition, the fourth through hole 31 is set to communicate with the second through hole 26 when the key 11a is fitted into the key hole 73 and the jig body 10 is positioned at the end position of the crimping process on the cylindrical portion 76 by the crimping protrusion 22.

[0066] As a result, even when the crimping protrusion 22 cannot be seen, the state of the crimping protrusion 22 relative to the cylindrical portion 76 can be grasped based on the communication state of the third through hole 30 relative to the first through hole 25 and the communication state of the fourth through hole 31 relative to the second through hole 26.

[0067] The crimping processing device 1 further includes a second pin 12 having an abutment surface 12a at its tip that can abut against the end face of the screw shaft 71 and that is inserted into the jig body 10 so that it can move back and forth in the direction of the central axis C of the jig body 10, and a fifth through hole 32 and a sixth through hole 33 provided in the second pin 12.

[0068] The fifth through hole 32 is set to communicate with the first through hole 25 when the jig body 10 is positioned so that the abutment surface 12a abuts against the end face of the screw shaft 71 and the crimping protrusion 22 abuts against the cylindrical portion 76.

[0069] In addition, the sixth through hole 33 is set to communicate with the second through hole 26 when the abutment surface 12a abuts against the end face of the screw shaft 71 and the jig body 10 is positioned at the end position of the crimping process on the cylindrical portion 76 by the crimping protrusion 22.

[0070] By combining this configuration of the fifth through hole 32 with the configuration of the third through hole 30, even if either the third through hole 30 or the fifth through hole 32 is connected to the first through hole 25, if the central axis C of the jig body 10 is inclined with respect to the central axis of the screw shaft 71, the first through hole 25 will remain closed halfway.

[0071] Similarly, by combining the configuration of the fifth through hole 32 with the configuration of the fourth through hole 31, even if either the fourth through hole 31 or the sixth through hole 33 is connected to the second through hole 26, if the central axis C of the jig body 10 is inclined with respect to the central axis of the screw shaft 71, the second through hole 26 will remain partially closed.

[0072] This allows the inclination of the jig body 10 relative to the screw shaft 71 to be grasped, and more appropriate crimping can be achieved.

[0073] Furthermore, the crimping processing device 1 has a first state detection sensor (e.g., a first light-emitting element 13 and a first light-receiving element 15) arranged in the first through hole 25 and detecting a first state in which the third through hole 30 and the fifth through hole 32 are connected to the first through hole 25, a second state detection sensor (e.g., a second light-emitting element 14 and a second light-receiving element 16) arranged in the second through hole 26 and detecting a second state in which the fourth through hole 31 and the sixth through hole 33 are connected to the second through hole 26, and an ECU 41 that drives and controls the vibration source 40.

[0074] When the first state is detected, the ECU 41 starts driving the vibration source 40, and when the second state is detected, the ECU 41 stops driving the vibration source 40. This allows the vibration source 40 to be driven at an appropriate timing.

[0075] In the above-described embodiment, the first and second light-emitting elements 13 and 14, the first and second light-receiving elements 15 and 16, and the ECU 41 may be omitted as appropriate.

[0076] In this case, the worker or the like visually confirms the first state in which the first through-hole 25 communicates with the third through-hole 30 and the fifth through-hole 32. Then, after confirming the first state, the worker or the like starts driving the vibration source 40 by operating a switch (not shown) or the like.

[0077] The worker or the like visually confirms the second state in which the second through-hole 26 communicates with the fourth through-hole 31 and the sixth through-hole 33. After confirming the second state, the worker or the like stops the driving of the vibration source 40 by operating a switch (not shown) or the like.

[0078] In this embodiment, the second pin hole 24 and the second pin 12 may be omitted from the crimping jig 5 as appropriate.

[0079] Next, a modification of this embodiment will be described with reference to FIGS.

[0080] In this modified example, the second pin hole 24 and the second pin 12 are omitted from the crimping jig 5. Instead, the crimping jig 5 of this modified example has a slider hole 45 and a slider 46.

[0081] The slider hole 45 extends in the direction of the central axis C of the jig body 10. The slider hole 45 is open at the tip end side of the jig body 10. The slider hole 45 is closed at the base end side of the jig body 10. The slider hole 45 is provided in an area that includes both sides of the crimping protrusion 22. A third return spring 47 is disposed deep inside the slider hole 45.

[0082] The slider 46 is inserted into the slider hole 45. The slider 46 has an escape groove 46a in the center thereof. The escape groove 46a is a groove for avoiding interference with the crimping projection 22.

[0083] A pair of guide surfaces 48 are provided at the tip of the slider 46. These guide surfaces 48 have shapes symmetrical with respect to the crimping projection 22. These guide surfaces 48 also give the tip of the slider 46 a tapered shape.

[0084] Each guide surface 48 configured in this manner has the function of centering the crimping projection 22 with respect to the crimping groove 72 by coming into contact with the crimping groove 72, as shown in, for example, FIGS.

[0085] This makes it possible to more precisely position the crimping projection 22 relative to the crimping groove 72 .

[0086] The invention described in the above embodiments is not limited to these embodiments, and various modifications can be made in the implementation stage without departing from the gist of the invention. Furthermore, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriate combinations of the disclosed multiple constituent elements.

[0087] For example, if the stated problem can be solved and the stated effect can be obtained even if some of the constituent elements are deleted from all the constituent elements shown in the above form, the configuration from which these constituent elements are deleted can be extracted as an invention. [Explanation of symbols]

[0088] 1. Crimping device 5... Crimping jig 6... Impact generator 10... Jig body 11 ... 1st pin 11a … Key 12 ... second pin 12a... Contact surface 13 ... First light-emitting element 14 ... Second light-emitting element 15 ... First light receiving element 16 ... Second light receiving element 20 … Connection shaft 21... Socket 22 ... Crimping protrusion 23 ... First pinhole 24 ... Second pin hole 25 ... First through hole 26 ... Second through hole 27 ... 1st return spring 28... Second return spring 30 ... Third through hole 31...4th through hole 32...5th through hole 33...6th through hole 40 … Vibration source 41...Electronic Control Unit (ECU) 45 ... Slider hole 46 ... slider 46a … Groove 47 ... Third return spring 48... Guide surface 50 … Wheel support mechanism 51 ... Steering knuckle 52 ... Wheel hub unit 53 ... Drive shaft 55... Arm 56 ... Bearing insertion hole 60... Wheel hub 61... Bearing 65 ... Shaft support tube 65a ... spline groove 66... ​​flange 66a ... Bolt insertion hole 70 ... Spline 71 ... screw shaft 72 ... Caulking groove 73 ... keyhole 75... Nut 76 ... Cylindrical part 76a ... Crimped part C … Central axis

Claims

1. A crimping device for crimping a part of a nut into a crimping groove of a screw shaft having a key hole on an end surface, A jig body; a first pin having a key at its tip end that can be fitted into the keyhole and that is inserted into the jig body so as to be movable back and forth in the central axis direction of the jig body; a crimping protrusion that protrudes from the jig body and is positioned at the center of the crimping groove when the key is fitted in the keyhole; A crimping device comprising:

2. a first through hole and a second through hole that are provided in the jig body and intersect with the first pin; a third through hole and a fourth through hole provided in the first pin; Furthermore, the third through hole communicates with the first through hole when the key is fitted into the key hole and the jig body is positioned so that the crimping protrusion abuts against a part of the nut; the fourth through hole communicates with the second through hole when the key is fitted into the key hole and the jig body is disposed at an end position of the crimping process on a part of the nut by the crimping protrusion, 2. The crimping device according to claim 1.

3. a second pin having a contact surface at a tip thereof that can contact an end surface of the screw shaft, and inserted into the jig body so as to be movable forward and backward in the central axis direction of the jig body; a fifth through hole and a sixth through hole provided in the second pin; Furthermore, The fifth through hole communicates with the first through hole when the jig body is disposed in a position where the abutment surface abuts against the end surface of the screw shaft and the crimping protrusion abuts against a part of the nut, The sixth through hole communicates with the second through hole when the abutment surface abuts against the end surface of the screw shaft and the jig body is disposed at an end position of the crimping process on a part of the nut by the crimping protrusion.

3. The crimping device according to claim 2.

4. a first state detection sensor disposed in the first through hole and configured to detect a first state in which the first through hole is in communication with the third through hole and the fifth through hole; a second state detection sensor disposed in the second through hole and configured to detect a second state in which the second through hole is in communication with the fourth through hole and the sixth through hole; a vibration source that applies vibration to the jig body in the central axis direction; a control means for controlling the driving of the vibration source; Equipped with 4. The crimping device according to claim 3, wherein the control means starts driving the vibration source when the first state is detected, and stops driving the vibration source when the second state is detected.

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