A clamping device for hobbing a rotor shaft of an automobile starter

Abstract

The application discloses a clamping device for gear hobbing of a rotor shaft of an automobile starter, and relates to the field of gear hobbing.The clamping device comprises a support, position-adjustable clamping units are symmetrically arranged on the two sides of the support, the clamping unit comprises a mounting seat arranged on the support, one end of the mounting seat is rotationally connected with a rotating drum, the end of the rotating drum is provided with a side clamping mechanism, an end clamping groove corresponding to the rotating drum is formed in the inner side surface of the mounting seat, an end clamping column is slidably connected to the inner side surface of the end clamping groove, and a driving unit is arranged between the end clamping column and the side clamping mechanism.The clamping device for gear hobbing of the rotor shaft of the automobile starter can realize synchronous limiting of the side surface and the end of the rotor shaft during gear hobbing of the rotor shaft through the cooperation between the side clamping mechanism, the end clamping column and the driving mechanism, so that the stability of the rotor shaft during gear hobbing is better.

Description

Technical Field

[0001] This invention relates to gear hobbing technology, specifically to a clamping device for gear hobbing of an automotive starter rotor shaft. Background Technology

[0002] The rotor shaft of an automotive starter is a crucial component of the starter, and its machining accuracy directly affects the starter's performance. Gear hobbing is a critical process in the rotor shaft's machining, and during this process, the rotor shaft must be reliably clamped to prevent wobbling and ensure machining accuracy.

[0003] A utility model patent with publication number CN220216976U discloses a clamping device for gear hobbing of an automotive starter rotor shaft. The device includes a base plate, a vertical plate fixedly mounted on one side of the upper surface of the base plate, a motor fixedly mounted on the outer side of the vertical plate, a first clamping mechanism fixedly mounted on the inner side of the vertical plate via a rotating seat, and the drive shaft of the motor fixedly connected to the first clamping mechanism to drive its rotation. A movable plate is connected to the other side of the upper surface of the base plate via a horizontal drive mechanism, and a second clamping mechanism is mounted on the inner side of the movable plate at the same horizontal position as the first clamping mechanism.

[0004] Both this patent and existing technologies can clamp and fix the side of the starter rotor shaft in actual use. However, neither can achieve simultaneous clamping of both ends of the rotor shaft while clamping the side. As the clamping components are prone to wear during long-term use, the stability of the side clamping is easily affected, which in turn affects the stability of the starter rotor shaft hobbing process. Summary of the Invention

[0005] The purpose of this invention is to provide a clamping device for gear hobbing of automobile starter rotor shafts, so as to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a clamping device for gear hobbing of an automotive starter rotor shaft, comprising a support, on which symmetrically arranged position-adjustable clamping units are provided on both sides; each clamping unit includes a mounting seat disposed on the support; a rotating cylinder is rotatably connected to one end of the mounting seat; a side clamping mechanism is provided at the end of the rotating cylinder; an end clamping groove corresponding to the rotating cylinder is opened on the inner side of the mounting seat; an end clamping column is slidably connected to the inner side of the end clamping groove; and a driving unit is disposed between the end clamping column and the side clamping mechanism; the driving unit is used to drive the side clamping mechanism to clamp the side of the rotor shaft and to drive the end clamping column to clamp the end of the rotor shaft.

[0007] Furthermore, the side clamping mechanism includes a connecting seat disposed at the end of the mounting base. A clamping groove is formed in the middle of the connecting seat along its axial direction. Three sets of guide grooves are formed in an annular shape on the surface of the connecting seat. A guide block is slidably connected to the inner side of the guide groove. A gripper is fixedly connected to the end of the guide block. The gripper is slidably connected to the surface of the connecting seat. A return spring is fixedly connected between the inside of the guide groove and the guide block.

[0008] Furthermore, the clamping surface of the gripper is arc-shaped and rough, and the position and size of the end clamping post are adapted to the clamping groove.

[0009] Furthermore, the drive unit includes a first annular groove formed inside the mounting base, an outer cylinder rotatably connected to the inner side of the first annular groove, a pressure-bearing inclined surface provided on the side of the gripper away from the clamping surface, and a drive inclined surface corresponding to the pressure-bearing inclined surface provided on the inner wall of the outer cylinder. When the drive inclined surface moves along the surface of the pressure-bearing inclined surface and applies a mutual pressing force to it, all the grippers move closer to each other and clamp and fix the rotor shaft.

[0010] Furthermore, the mounting base has a second annular groove that communicates with the first annular groove inside. A first annular sleeve is rotatably connected to the inner side of the second annular groove. The outer cylinder is slidably connected to the inner side of the first annular sleeve. The inner wall of the first annular sleeve has multiple sets of straight grooves equidistantly arranged in a circular shape. A protrusion is slidably connected to the inner side of the straight groove. The protrusion is fixedly connected to the side of the outer cylinder, and a first spring is connected between the protrusion and the inner wall of the straight groove.

[0011] Furthermore, the mounting base has a third annular groove that communicates with the end clamping groove inside. A second annular sleeve is rotatably connected to the inner side of the third annular groove. The inner wall of the second annular sleeve has multiple sets of guide grooves equidistantly arranged in a circular shape. A guide block is slidably connected to the inner side of the guide groove. The guide block is fixedly connected to the side of the end clamping column. A second spring is connected between the guide block and the inner wall of the guide groove.

[0012] Furthermore, the mounting base has multiple sets of push rod grooves corresponding to the outer cylinder inside. Push rods are slidably connected to the inner side of the push rod grooves. The ends of all push rods are fixedly connected to the same ring seat. The inner wall of the ring seat is circularly formed with multiple sets of limiting guide grooves. Limiting guide plates are slidably connected to the inner side of the limiting guide grooves. A third spring is fixedly connected between the limiting guide plate and the inner wall of the limiting guide groove. A top cylinder is slidably connected to the inner side of the end clamping groove. A connecting rod is slidably connected to the inner side of the top cylinder. A fourth spring is connected between the connecting rod and the inner wall of the top cylinder. The limiting guide plate is fixedly connected to the connecting rod. An electric rod is installed on the outside of the mounting base. The telescopic end of the electric rod is fixedly connected to the connecting rod.

[0013] Furthermore, an external controller is provided outside the support, a first pressure plate is provided between the protrusion and the first spring, a first pressure sensor is provided between the first pressure plate and the protrusion, the first spring is fixedly connected to the first pressure plate, a second pressure plate is provided between the inner wall of the top cylinder and the fourth spring, a second pressure sensor is provided between the second pressure plate and the inner wall of the top cylinder, the fourth spring is fixedly connected to the second pressure plate, and the first pressure sensor, the second pressure sensor and the electric rod are all electrically connected to the controller.

[0014] Furthermore, the support surface is symmetrically provided with drive grooves on both sides, and the same bidirectional screw is rotatably connected between the two drive grooves. The two sides of the bidirectional screw are symmetrically threaded with support columns, and the two support columns are respectively fixedly connected to two mounting seats. The bidirectional screw is driven by a motor, and the motor is electrically connected to the controller.

[0015] Furthermore, both the first and second annular grooves penetrate the surface of the mounting base near the gripper. The surface of the mounting base is provided with a sealing plate corresponding to the first and second annular grooves. The surface of the sealing plate and the surface of the mounting base are provided with corresponding threaded holes. The inner side of the threaded hole is threaded with a locking screw. The end of the rotating cylinder is provided with an embedded annular groove. The end of the connecting base is provided with an assembly ring corresponding to the embedded annular groove. The surface of the rotating cylinder and the surface of the assembly ring are provided with corresponding threaded grooves. The inner side of the threaded groove is threaded with a fixing bolt.

[0016] Compared with the prior art, the clamping device for gear hobbing of automobile starter rotor shaft provided by the present invention has the following advantages:

[0017] 1. The clamping equipment for hobbing the rotor shaft of an automobile starter can simultaneously limit the side and end of the rotor shaft during the hobbing process by cooperating with the side clamping mechanism, the end clamping column and the drive mechanism, thereby improving its stability during the hobbing process.

[0018] 2. This clamping device for machining the gear hobbing of the automobile starter rotor shaft restricts the position of the first ring sleeve through the cooperation of the locking screw and the sealing plate, so that it can maintain stable operation and can be removed when needed, thereby fully exposing the connecting seat and the gripper. At the same time, with the cooperation between the embedded ring groove, the assembly ring, the groove and the fixing bolt, the connecting seat can be removed from the rotating drum and replaced as needed. Thus, the gripper can be replaced as needed during actual use. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the mounting base structure provided in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the internal structure of the mounting base provided in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the overall longitudinal sectional structure of the mounting base provided in an embodiment of the present invention;

[0024] Figure 5 Provided for embodiments of the present invention Figure 4 Enlarged structural diagram at point A in the middle;

[0025] Figure 6 Provided for embodiments of the present invention Figure 4 Enlarged structural diagram at point B;

[0026] Figure 7 Provided for embodiments of the present invention Figure 4 Enlarged structural diagram at point C;

[0027] Figure 8 This is a schematic diagram of the structure of the rotating drum and connecting seat in a separated state according to an embodiment of the present invention;

[0028] Figure 9 This is a schematic diagram of the outer cylinder and gripper separation state provided in an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Support; 2. Mounting base; 21. Rotary cylinder; 22. End clamping groove; 23. End clamping column; 3. Connecting seat; 31. Clamping groove; 32. Guide groove; 33. Guide block; 34. Clamping claw; 35. Return spring; 4. Outer cylinder; 41. Pressure inclined surface; 42. Driving inclined surface; 43. First ring sleeve; 44. Straight groove; 45. Protrusion; 46. First spring; 47. Second ring sleeve; 48. Guide groove; 49. Guide block; 410. Second spring; 411. Push rod; 412. Ring seat; 4 13. Restricting guide groove; 414. Restricting guide plate; 415. Third spring; 416. Top cylinder; 417. Connecting rod; 418. Fourth spring; 419. Electric rod; 5. First pressure plate; 51. First pressure sensor; 52. Second pressure plate; 53. Second pressure sensor; 6. Drive groove; 61. Bidirectional screw; 62. Support column; 7. Sealing plate; 71. Threaded hole; 72. Locking screw; 73. Embedded annular groove; 74. Assembly ring; 75. Threaded groove; 76. Fixing bolt. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] Example 1:

[0033] Please see Figure 1 - Figure 9 A clamping device for gear hobbing of an automotive starter rotor shaft includes a support 1. Two adjustable clamping units are symmetrically arranged on both sides of the support 1. Each clamping unit includes a mounting base 2 mounted on the support 1. A rotating cylinder 21 is rotatably connected to one end of the mounting base 2. A side clamping mechanism is provided at the end of the rotating cylinder 21. An end clamping groove 22 corresponding to the rotating cylinder 21 is opened on the inner side of the mounting base 2. An end clamping column 23 is slidably connected to the inner side of the end clamping groove 22. A driving unit is provided between the end clamping column 23 and the side clamping mechanism. The driving unit is used to drive the side clamping mechanism to clamp the side of the rotor shaft and to drive the end clamping column 23 to clamp the end of the rotor shaft.

[0034] It should be further explained that the distance between the end of the end clamping post 23 and the connecting seat 3 corresponds to the distance between the jaws 34 moving closer to each other to their limit position. This allows the end of the end clamping post 23 to move to be flush with the end of the connecting seat 3 on the side closest to the end clamping post 23 when the jaws 34 move closer to each other to the end of their stroke. This ensures that during the rotor shaft clamping process, the side of the rotor shaft can be clamped first, and then its end can be abutted and limited.

[0035] The specific structure of the side clamping mechanism is described below. The side clamping mechanism includes a connecting seat 3 located at the end of the mounting base 2. A clamping groove 31 is provided in the middle of the connecting seat 3 along its axial direction. Three sets of guide grooves 32 are provided in an annular shape at equal intervals on the surface of the connecting seat 3. A guide block 33 is slidably connected to the inner side of the guide groove 32. A gripper 34 is fixedly connected to the end of the guide block 33. The gripper 34 is slidably connected to the surface of the connecting seat 3. A return spring 35 is fixedly connected between the inside of the guide groove 32 and the guide block 33.

[0036] It should be noted that the clamping surface of the gripper 34 is arc-shaped and rough, which makes the gripper 34 more stable when clamping the side of the rotor shaft.

[0037] In addition, the position and size of the end clamping post 23 are adapted to the clamping groove 31, so that the end clamping post 23 can enter the clamping groove 31 normally and abut and fix the end of the rotor shaft.

[0038] The specific structure of the drive unit is described below. The drive unit includes a first annular groove inside the mounting base 2. An outer cylinder 4 is rotatably connected to the inner side of the first annular groove. A pressure-bearing inclined surface 41 is provided on the side of the gripper 34 away from the clamping surface. A drive inclined surface 42 corresponding to the pressure-bearing inclined surface 41 is provided on the inner wall of the outer cylinder 4. When the drive inclined surface 42 moves along the surface of the pressure-bearing inclined surface 41 and applies a mutual squeezing force to it, all the grippers 34 move closer to each other and clamp and fix the rotor shaft.

[0039] It should be added that the mounting base 2 has a second annular groove that communicates with the first annular groove. The inner side of the second annular groove is rotatably connected to the first annular sleeve 43. The outer cylinder 4 is slidably connected to the inner side of the first annular sleeve 43. The inner wall of the first annular sleeve 43 is provided with multiple sets of straight grooves 44 at equal intervals in a circular shape. The inner side of the straight groove 44 is slidably connected to the protrusion 45. The protrusion 45 is fixedly connected to the side of the outer cylinder 4. A first spring 46 is connected between the protrusion 45 and the inner wall of the straight groove 44. The first spring 46 is located on the side of the protrusion 45 near the gripper 34, so that when the push rod 411 no longer applies a pushing force to the outer cylinder 4, the outer cylinder 4 can move in the opposite direction and reset under the action of the rebound force of the first spring 46.

[0040] Furthermore, the mounting base 2 has a third annular groove inside that communicates with the end clamping groove 22. The inner side of the third annular groove is rotatably connected to a second ring sleeve 47. The inner wall of the second ring sleeve 47 is equidistantly provided with multiple sets of guide grooves 48 in an annular shape. The inner side of the guide groove 48 is slidably connected to a guide block 49. The guide block 49 is fixedly connected to the side of the end clamping column 23. A second spring 410 is connected between the guide block 49 and the inner wall of the guide groove 48. The second spring 410 is located on the side of the guide block 49 near the clamping claw 34, so that when the guide block 49 moves with the end clamping column 23, it can compress the second spring 410, so that when the end clamping column 23 loses its thrust, it can automatically reset.

[0041] Furthermore, the mounting base 2 has multiple sets of push rod grooves corresponding to the outer cylinder 4 inside. Push rods 411 are slidably connected to the inner side of the push rod grooves. The ends of all push rods 411 are fixedly connected to the same ring seat 412. The inner wall of the ring seat 412 is circularly formed with multiple sets of limiting guide grooves 413. Limiting guide plates 414 are slidably connected to the inner side of the limiting guide grooves 413. A third spring 415 is fixedly connected between the limiting guide plates 414 and the inner wall of the limiting guide grooves 413. The inner side of the end clamping groove 22 is slidably connected to the push cylinder 416. A connecting rod 417 is slidably connected to the inner side of the top cylinder 416. A fourth spring 418 is connected between the connecting rod 417 and the inner wall of the top cylinder 416. The spring force coefficients of the third spring 415 and the fourth spring 418 are both greater than the spring force coefficients of the first spring 46 and the second spring 410. The spring force coefficient of the third spring 415 is the same as that of the fourth spring 418. The limiting guide plate 414 is fixedly connected to the connecting rod 417. An electric rod 419 is installed on the outside of the mounting base 2. The telescopic end of the electric rod 419 is fixedly connected to the connecting rod 417.

[0042] During operation, one end of the rotor shaft is placed into the clamping groove 31, and the connecting rod 417 is driven by the electric rod 419 to move closer to the gripper 34. The movement of the connecting rod 417 drives the ring seat 412 and the push rod 411 to move, so that the push rod 411 can push the outer cylinder 4 to move. When the outer cylinder 4 moves, the driving inclined surface 42 on its inner wall cooperates with the pressure inclined surface 41 on the side of the gripper 34 to apply a mutual pushing force to the gripper 34, so that all the grippers 34 move closer to each other and clamp and fix the side of the rotor shaft.

[0043] The movement of connecting rod 417 will also drive the top cylinder 416 to move. The movement of top cylinder 416 will drive the end clamping column 23 to move. After the clamping jaw 34 clamps the side of the rotor shaft, the end clamping column 23 moves to contact the end of the rotor shaft.

[0044] During the movement of the outer cylinder 4, the protrusion 45 moves synchronously with the movement of the outer cylinder 4 and compresses the first spring 46 during the movement. During the movement of the end clamp 23, the guide block 49 moves synchronously and compresses the second spring 410. Thus, after the top rod 411 and the top cylinder 416 move in opposite directions to reset, the outer cylinder 4 and the end clamp 23 can move in opposite directions to reset under the action of the rebound force of the first spring 46 and the second spring 410.

[0045] Example 2:

[0046] Please see Figure 6 This embodiment provides a technical solution based on the above embodiments: an external controller is provided on the outside of the support 1, a first pressure plate 5 is provided between the protrusion 45 and the first spring 46, a first pressure sensor 51 is provided between the first pressure plate 5 and the protrusion 45, the first spring 46 is fixedly connected to the first pressure plate 5, a second pressure plate 52 is provided between the inner wall of the top cylinder 416 and the fourth spring 418, a second pressure sensor 53 is provided between the second pressure plate 52 and the inner wall of the top cylinder 416, the fourth spring 418 is fixedly connected to the second pressure plate 52, and the first pressure sensor 51, the second pressure sensor 53 and the electric rod 419 are all electrically connected to the controller.

[0047] It should be noted that during the process of the outer cylinder 4 moving first and driving the gripper 34 to move to clamp and fix the side of the rotor shaft, the protrusion 45 moves and drives the first pressure plate 5 to move to apply pressure to the first spring 46, so that the first spring 46 is compressed and applies pressure to the gripper 34. At this time, the pressure applied by the first pressure sensor 51 to the gripper 34 by the first pressure sensor 51 is detected. Similarly, the pressure applied by the fourth spring 418 to the end clamping column 23 by the second pressure sensor 53 is detected. Both of them transmit the detected data to the controller, so that when the pressure values ​​detected by the first pressure sensor 51 and the second pressure sensor 53 reach the set value, the controller controls the electric rod 419 to stop driving.

[0048] It should be further explained that during the setup process, the detection thresholds of the first pressure sensor 51 and the second pressure sensor 53 need to be set so that the clamping pressure values ​​of the gripper 34 and the end clamping post 23 can meet the requirements for stable clamping and fixing of the rotor shaft during the clamping process.

[0049] Example 3:

[0050] Please see Figure 1This embodiment provides a technical solution based on the above embodiment: drive grooves 6 are symmetrically opened on both sides of the surface of the support 1, and the same bidirectional screw 61 is rotatably connected between the two drive grooves 6. The two sides of the bidirectional screw 61 are symmetrically threaded with support columns 62. The two support columns 62 are respectively fixedly connected to two mounting seats 2, and the bidirectional screw 61 is driven by a motor, and the motor is electrically connected to the controller.

[0051] During operation, the bidirectional screw 61 is driven to rotate by the motor, which allows the distance between the two mounting bases 2 to be adjusted as needed, and also facilitates the installation and removal of the rotor shaft.

[0052] Example 4:

[0053] Please see Figure 2 - Figure 3 , Figure 8 This embodiment provides a technical solution based on the above embodiments: the first annular groove and the second annular groove are both disposed through the surface of the mounting base 2 near the gripper 34. The surface of the mounting base 2 is provided with a sealing plate 7 corresponding to the first annular groove and the second annular groove. The surface of the sealing plate 7 and the surface of the mounting base 2 are provided with corresponding threaded holes 71. The inner side of the threaded hole 71 is threadedly connected to a locking screw 72. The end of the rotating cylinder 21 is provided with an embedded annular groove 73. The end of the connecting base 3 is provided with an assembly ring 74 corresponding to the embedded annular groove 73. The surface of the rotating cylinder 21 and the surface of the assembly ring 74 are provided with corresponding threaded grooves 75. The inner side of the threaded groove 75 is threadedly connected to a fixing bolt 76.

[0054] It should be noted that the minimum inner diameter of the outer cylinder 4 is greater than the minimum outer diameter of the gripper 34. That is, when the gripper 34 moves close to each other to the limit position, the distance between its outer surface and the central axis of the connecting seat 3 is less than the minimum inner diameter of the outer cylinder 4, thus ensuring that the outer cylinder 4 can pass smoothly through the gripper 34.

[0055] During use, when machining rotor shafts of different specifications requires replacement of the connecting seat 3 and the clamping jaws 34, the locking screw 72 is removed to allow the sealing plate 7 to be taken out. Then, the operator pulls the outer cylinder 4 outward to allow it to move outward and be taken out. At this time, the operator can remove the fixing bolt 76 to allow the connecting seat 3 to be removed and replaced, so that the appropriate connecting seat 3 and clamping jaws 34 can be selected as needed.

[0056] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A clamping device for gear hobbing of an automobile starter rotor shaft, comprising a support (1), wherein adjustable clamping units are symmetrically arranged on both sides of the support (1), characterized in that, The clamping unit includes a mounting base (2) disposed on a support (1). One end of the mounting base (2) is rotatably connected to a rotating cylinder (21). The end of the rotating cylinder (21) is provided with a side clamping mechanism. The inner side of the mounting base (2) is provided with an end clamping groove (22) corresponding to the rotating cylinder (21). The inner side of the end clamping groove (22) is slidably connected to an end clamping column (23). A driving unit is disposed between the end clamping column (23) and the side clamping mechanism. The driving unit is used to drive the side clamping mechanism to clamp the side of the rotor shaft and to drive the end clamping column (23) to clamp the end of the rotor shaft. The drive unit includes a first annular groove formed inside the mounting base (2). An outer cylinder (4) is rotatably connected to the inner side of the first annular groove. Multiple sets of push rod grooves corresponding to the outer cylinder (4) are formed inside the mounting base (2). Push rods (411) are slidably connected to the inner side of the push rod grooves. The ends of all push rods (411) are fixedly connected to the same annular seat (412). Multiple sets of limiting guide grooves (413) are formed in an annular shape on the inner wall of the annular seat (412). A limiting guide plate (414) is slidably connected to the inner side of the limiting guide groove (413). The limiting guide plate (414) and the limiting guide groove (413) are connected to each other. 13) A third spring (415) is fixedly connected between the inner walls. A top cylinder (416) is slidably connected to the inner side of the end clamping groove (22). The movement of the top cylinder (416) drives the end clamping column (23) to move. A connecting rod (417) is slidably connected to the inner side of the top cylinder (416). A fourth spring (418) is connected between the connecting rod (417) and the inner wall of the top cylinder (416). The limiting guide plate (414) is fixedly connected to the connecting rod (417). An electric rod (419) is installed on the outside of the mounting base (2). The telescopic end of the electric rod (419) is fixedly connected to the connecting rod (417).

2. The clamping device for gear hobbing of an automobile starter rotor shaft according to claim 1, characterized in that, The side clamping mechanism includes a connecting seat (3) disposed at the end of the mounting base (2). A clamping groove (31) is provided in the middle of the connecting seat (3) along its axial direction. Three sets of guide grooves (32) are provided in an annular shape on the surface of the connecting seat (3). A guide block (33) is slidably connected to the inner side of the guide groove (32). A clamping claw (34) is fixedly connected to the end of the guide block (33). The clamping claw (34) is slidably connected to the surface of the connecting seat (3). A return spring (35) is fixedly connected between the inside of the guide groove (32) and the guide block (33).

3. The clamping device for gear hobbing of an automobile starter rotor shaft according to claim 2, characterized in that, The clamping surface of the gripper (34) is arc-shaped and rough. The position and size of the end clamping post (23) are adapted to the clamping groove (31).

4. The clamping device for gear hobbing of an automotive starter rotor shaft according to claim 3, characterized in that, The gripper (34) has a pressure-receiving inclined surface (41) on the side away from the clamping surface. The inner wall of the outer cylinder (4) has a driving inclined surface (42) corresponding to the pressure-receiving inclined surface (41). When the driving inclined surface (42) moves along the surface of the pressure-receiving inclined surface (41) and applies a mutual squeezing force to it, all the grippers (34) move closer to each other and clamp and fix the rotor shaft.

5. A clamping device for gear hobbing of an automobile starter rotor shaft according to claim 4, characterized in that, The mounting base (2) has a second annular groove that communicates with the first annular groove. The inner side of the second annular groove is rotatably connected to a first annular sleeve (43). The outer cylinder (4) is slidably connected to the inner side of the first annular sleeve (43). The inner wall of the first annular sleeve (43) is provided with multiple sets of straight grooves (44) at equal intervals in a circular shape. The inner side of the straight groove (44) is slidably connected to a protrusion (45). The protrusion (45) is fixedly connected to the side of the outer cylinder (4), and a first spring (46) is connected between the protrusion (45) and the inner wall of the straight groove (44).

6. A clamping device for gear hobbing of an automobile starter rotor shaft according to claim 5, characterized in that, The mounting base (2) has a third annular groove that communicates with the end clamping groove (22). The inner side of the third annular groove is rotatably connected to a second ring sleeve (47). The inner wall of the second ring sleeve (47) is provided with multiple sets of guide grooves (48) at equal intervals in a circular shape. The inner side of the guide groove (48) is slidably connected to a guide block (49). The guide block (49) is fixedly connected to the side of the end clamping column (23). A second spring (410) is connected between the guide block (49) and the inner wall of the guide groove (48).

7. A clamping device for gear hobbing of an automotive starter rotor shaft according to claim 6, characterized in that, An external controller is provided on the outside of the support (1). A first pressure plate (5) is provided between the protrusion (45) and the first spring (46). A first pressure sensor (51) is provided between the first pressure plate (5) and the protrusion (45). The first spring (46) is fixedly connected to the first pressure plate (5). A second pressure plate (52) is provided between the inner wall of the top cylinder (416) and the fourth spring (418). A second pressure sensor (53) is provided between the second pressure plate (52) and the inner wall of the top cylinder (416). The fourth spring (418) is fixedly connected to the second pressure plate (52). The first pressure sensor (51), the second pressure sensor (53), and the electric rod (419) are all electrically connected to the controller.

8. A clamping device for gear hobbing of an automobile starter rotor shaft according to claim 7, characterized in that, The support (1) has symmetrical drive grooves (6) on both sides of its surface. The same bidirectional screw (61) is rotatably connected between the two drive grooves (6). The two sides of the bidirectional screw (61) are symmetrically threaded with support columns (62). The two support columns (62) are fixedly connected to two mounting seats (2) respectively. The bidirectional screw (61) is driven by a motor, and the motor is electrically connected to the controller.

9. A clamping device for gear hobbing of an automobile starter rotor shaft according to claim 8, characterized in that, The first and second annular grooves are both provided through the surface of the mounting base (2) near the gripper (34). The surface of the mounting base (2) is provided with a sealing plate (7) corresponding to the first and second annular grooves. The surface of the sealing plate (7) and the surface of the mounting base (2) are provided with corresponding threaded holes (71). The inner side of the threaded hole (71) is threaded with a locking screw (72). The end of the rotating cylinder (21) is provided with an embedded annular groove (73). The end of the connecting seat (3) is provided with an assembly ring (74) corresponding to the embedded annular groove (73). The surface of the rotating cylinder (21) and the surface of the assembly ring (74) are provided with corresponding threaded grooves (75). The inner side of the threaded groove (75) is threaded with a fixing bolt (76).

Images