Clamping equipment for gear hobbing of rotor shaft of automobile starter

Abstract

The invention discloses clamping equipment for gear hobbing of a rotor shaft of an automobile starter, and relates to the field of gear hobbing, the clamping equipment comprises a support, position-adjustable clamping units are symmetrically arranged on the two sides of the support, each clamping unit comprises a mounting seat arranged on the support, one end of each mounting seat is rotatably connected with a rotary drum, and the other end of each mounting seat is rotatably connected with a rotary shaft; a side clamping mechanism is arranged at the end of the rotary drum, an end clamping groove corresponding to the rotary drum is formed in the inner side face of the mounting base, an end clamping column is slidably connected to the inner side face of the end clamping groove, and a driving unit is arranged between the end clamping column and the side clamping mechanism. According to the clamping equipment for gear hobbing of the rotor shaft of the automobile starter, through mutual cooperation of the side clamping mechanism, the end clamping column and the driving mechanism, synchronous limiting can be conducted on the side face and the end of the rotor shaft in the gear hobbing process of the rotor shaft, and therefore the stability of the rotor shaft in the gear hobbing process is better.

Description

Technical Field

[0001] The invention relates to gear hobbing technology, in particular to a clamping device for gear hobbing of a rotor shaft of an automobile starter. Background Art

[0002] The rotor shaft of an automotive starter is a crucial component, and its machining accuracy directly impacts starter performance. Gear hobbing is a critical step in rotor shaft machining, and reliable clamping is essential during gear hobbing to prevent movement and maintain machining accuracy.

[0003] The existing utility model patent with announcement number CN220216976U discloses a clamping device for hobbing processing of automobile starter rotor shaft, including a base plate, a vertical plate fixedly provided on one side of the upper end surface of the base plate, a motor fixedly provided on the outer side of the vertical plate, a first clamping mechanism fixedly provided on the inner side of the vertical plate through a rotating seat, the driving shaft of the motor is fixedly connected to the first clamping mechanism to drive it to rotate, a movable plate is connected on the other side of the upper end surface of the base plate through a horizontal driving mechanism, and a second clamping mechanism is provided on the inner side of the movable plate and at the same horizontal position as the first clamping mechanism.

[0004] In actual use, both this patent and the prior art can clamp and fix the side of the starter rotor shaft. However, during the clamping process, both cannot effectively achieve the simultaneous clamping of the two side ends of the rotor shaft while clamping the side of the rotor shaft. Since the clamping components are prone to wear during long-term use, the side clamping stability is easily affected, thereby affecting the stability of the starter rotor shaft during the gear hobbing process. Summary of the Invention

[0005] The purpose of the present invention is to provide a clamping device for gear hobbing of a rotor shaft of an automobile starter, so as to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: A clamping device for hobbing the rotor shaft of an automobile starter, comprising a support, wherein position-adjustable clamping units are symmetrically arranged on both sides of the support, the clamping unit comprising a mounting seat arranged on the support, one end of the mounting seat is rotatably connected to a rotating drum, the end of the rotating drum is provided with a side clamping mechanism, the inner side surface of the mounting seat is provided with an end clamping groove corresponding to the rotating drum, the inner side surface of the end clamping groove is slidably connected with an end clamping column, a driving unit is provided 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 surface of the rotor shaft and drive the end clamping column to clamp the end of the rotor shaft.

[0007] Furthermore, the side clamping mechanism includes a connecting seat arranged at the end of the mounting seat, a clamping groove is opened in the middle part of the connecting seat along its axial direction, the surface of the connecting seat is annular and has three groups of guide grooves equidistantly opened, the inner side surface of the guide groove is slidably connected to a guide block, the end of the guide block is fixedly connected to a clamping claw, the clamping claw is slidably connected to the surface of the connecting seat, and a reset spring is fixedly connected between the inside of the guide groove and the guide block.

[0008] Furthermore, the clamping surface of the clamping jaw is arranged in an arc shape, and the clamping surface of the clamping jaw is arranged rough, and the position and size specifications of the end clamping column are adapted to the clamping groove.

[0009] Furthermore, the driving unit includes a first annular groove provided inside the mounting seat, the inner side surface of the first annular groove is rotatably connected to the outer cylinder, a pressure inclined surface is provided on the side of the clamping jaw away from the clamping surface, and a driving inclined surface corresponding to the pressure inclined surface is provided on the inner wall of the outer cylinder. When the driving inclined surface moves along the surface of the pressure inclined surface and applies an extrusion force to it, all the clamping jaws approach each other and clamp and fix the rotor shaft.

[0010] Furthermore, a second annular groove connected to the first annular groove is provided inside the mounting seat, the inner side surface of the second annular groove is rotatably connected to the first annular sleeve, the outer cylinder is slidably connected to the inner side surface of the first annular sleeve, the inner wall of the first annular sleeve is annular and has multiple groups of straight grooves equidistantly provided, the inner side surface of the straight groove is slidably connected to a protrusion, the protrusion is fixedly connected to the side surface of the outer cylinder, and a first spring is connected between the protrusion and the inner wall of the straight groove.

[0011] Furthermore, a third annular groove connected to the end clamp groove is provided inside the mounting seat, and the inner side surface of the third annular groove is rotatably connected to a second ring sleeve, and the inner wall of the second ring sleeve is annular and has multiple groups of guide grooves equidistantly provided, and the inner side surface of the guide groove is slidably connected to a guide block, and the guide block is fixedly connected to the side surface of the end clamp column, and a second spring is connected between the guide block and the inner wall of the guide groove.

[0012] Furthermore, the interior of the mounting seat is provided with multiple groups of push rod grooves corresponding to the outer tube, the inner side surfaces of the push rod grooves are slidably connected to the push rods, the ends of all the push rods are fixedly connected to the same ring seat, the inner wall of the ring seat is annular and provided with multiple groups of limiting guide grooves, the inner side surfaces of the limiting guide grooves are slidably connected to the limiting guide plates, a third spring is fixedly connected between the limiting guide plates and the inner wall of the limiting guide grooves, the inner side surfaces of the end clamping grooves are slidably connected to the push tube, the inner side surface of the push tube is slidably connected to the connecting rod, a fourth spring is connected between the connecting rod and the inner wall of the push tube, the limiting guide plate is fixedly connected to the connecting rod, an electric rod is installed on the outside of the mounting seat, and the telescopic end of the electric rod is fixedly connected to the connecting rod.

[0013] Furthermore, an external controller is provided on the outside of 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 tube and the fourth spring, a second pressure sensor is provided between the second pressure plate and the inner wall of the top tube, 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, drive grooves are symmetrically opened on both sides of the support surface, and the same bidirectional screw is rotatably connected between the drive grooves on both sides. Pillars are symmetrically threaded on both sides of the bidirectional screw, and the pillars on both sides are fixedly connected to two mounting seats respectively, and the bidirectional screw is driven by a motor, and the motor is electrically connected to the controller.

[0015] Furthermore, the first ring groove and the second ring groove are both arranged through the surface of the mounting seat near the clamping jaw, and the surface of the mounting seat is provided with a sealing plate corresponding to the first ring groove and the second ring groove, and the surface of the sealing plate and the surface of the mounting seat are both provided with corresponding threaded holes, and the inner side surface of the threaded hole is threadedly connected with a locking screw, and the end of the rotating cylinder is provided with an embedded ring groove, and the end of the connecting seat is provided with an assembly ring corresponding to the embedded ring groove, and the surface of the rotating cylinder and the surface of the assembly ring are both provided with corresponding screw grooves, and the inner side surface of the screw groove is threadedly connected with a fixing bolt.

[0016] Compared with the prior art, the clamping device for gear hobbing of a rotor shaft of an automobile starter provided by the present invention has the following beneficial effects: 1. The clamping device for gear hobbing of the rotor shaft of the automobile starter can synchronously limit the side and end of the rotor shaft during gear hobbing through the mutual cooperation between the side clamping mechanism, the end clamping column and the driving mechanism, thereby improving its stability during the gear hobbing process.

[0017] 2. This clamping device for gear hobbing of the rotor shaft of an automobile starter motor limits the position of the first ring sleeve by cooperating with a locking screw and a sealing plate, so that it can maintain stable operation and can be removed when needed, thereby completely exposing the connecting seat and the clamping jaws. At the same time, with the mutual cooperation between the embedded ring groove, the assembly ring, the drop groove and the fixing bolts, the connecting seat can be removed from the rotating drum and replaced as needed, so that the clamping jaws can be replaced as needed during actual use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention; Figure 2 A schematic diagram of the mounting base structure provided by an embodiment of the present invention; Figure 3 A schematic diagram of the internal structure of a mounting base provided by an embodiment of the present invention; Figure 4 A schematic diagram of the overall longitudinal cross-sectional structure of the mounting base provided by an embodiment of the present invention; Figure 5 The embodiment of the present invention provides Figure 4 A in the middle is an enlarged structural diagram; Figure 6 The embodiment of the present invention provides Figure 4 The enlarged structural diagram at B in the middle; Figure 7 The embodiment of the present invention provides Figure 4 The enlarged structural diagram at C in the middle; Figure 8 A schematic diagram of the structure of the rotary drum and the connecting base in the separated state provided by an embodiment of the present invention; Figure 9 This is a structural schematic diagram of the outer cylinder and the clamping claws in the separated state provided by an embodiment of the present invention.

[0020] Description of reference numerals: 1. Support; 2. Mounting seat; 21. Rotating 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. Ejector rod; 412. Ring seat; 4 13. Limiting guide groove; 414. Limiting 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. Driving groove; 61. Bidirectional screw; 62. Pillar; 7. Closing plate; 71. Threaded hole; 72. Locking screw; 73. Embedded ring groove; 74. Assembly ring; 75. Screw groove; 76. Fixing bolt. DETAILED DESCRIPTION

[0021] In order 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.

[0022] Example 1: See also Figure 1 - Figure 9 A clamping device for hobbing the rotor shaft of an automobile starter comprises a support 1, with position-adjustable clamping units symmetrically arranged on both sides of the support 1, the clamping unit comprising a mounting seat 2 arranged on the support 1, one end of the mounting seat 2 being rotatably connected to a rotating cylinder 21, a side clamping mechanism being arranged at the end of the rotating cylinder 21, an end clamping groove 22 corresponding to the rotating cylinder 21 being opened on the inner side surface of the mounting seat 2, an end clamping column 23 being slidably connected to the inner side surface of the end clamping groove 22, a driving unit being arranged between the end clamping column 23 and the side clamping mechanism, the driving unit being used to drive the side clamping mechanism to clamp the side surface of the rotor shaft and to drive the end clamping column 23 to clamp the end of the rotor shaft.

[0023] It should be noted that the distance between the end of the end clamping column 23 and the connecting seat 3 corresponds to the distance when the clamping jaws 34 move closer to each other and reach the extreme position, so that when the clamping jaws 34 move closer to each other and reach the end of the stroke, the end of the end clamping column 23 can be moved to be flush with the end of the connecting seat 3 on the side close to the end clamping column 23, thereby ensuring 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.

[0024] The specific structure of the side clamping mechanism is described below. The side clamping mechanism includes a connecting seat 3 arranged at the end of the mounting seat 2. A clamping groove 31 is provided in the middle of the connecting seat 3 along its axial direction. The surface of the connecting seat 3 is annular and has three groups of guide grooves 32 equidistantly provided. The inner side of the guide groove 32 is slidably connected to a guide block 33. The end of the guide block 33 is fixedly connected to a clamping claw 34. 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.

[0025] It should be noted that the clamping surface of the clamping jaw 34 is arranged in an arc shape, and the clamping surface of the clamping jaw 34 is arranged in a rough shape, so that the clamping jaw 34 has better stability when clamping the side surface of the rotor shaft; In addition, the position and size of the end clamping column 23 are compatible with the clamping groove 31, so that the end clamping column 23 can normally enter the clamping groove 31 and abut and fix the end of the rotor shaft.

[0026] The specific structure of the drive unit is described below. The drive unit includes a first annular groove formed inside the mounting base 2. The inner side surface of the first annular groove is rotatably connected to the outer cylinder 4. A pressure inclined surface 41 is provided on the side of the clamping jaws 34 away from the clamping surface. The inner wall of the outer cylinder 4 is provided with a driving inclined surface 42 corresponding to the pressure inclined surface 41. When the driving inclined surface 42 moves along the surface of the pressure inclined surface 41 and applies a pressing force to it, all the clamping jaws 34 approach each other and clamp the rotor shaft.

[0027] It should be added that a second annular groove connected to the first annular groove is provided inside the mounting seat 2, and the inner side surface of the second annular groove is rotatably connected to the first annular sleeve 43, and the outer cylinder 4 is slidably connected to the inner side surface of the first annular sleeve 43, and the inner wall of the first annular sleeve 43 is annular and has multiple groups of straight grooves 44 equidistantly provided, and the inner side surface of the straight groove 44 is slidably connected to a protrusion 45, which is fixedly connected to the side surface 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, and the first spring 46 is arranged on the side of the protrusion 45 close to the clamping claw 34, so that when the push rod 411 no longer applies thrust 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.

[0028] Furthermore, a third annular groove connected to the end clamping groove 22 is provided inside the mounting seat 2, and the inner side surface of the third annular groove is rotatably connected to the second ring sleeve 47, and the inner wall of the second ring sleeve 47 is annular and has multiple groups of guide grooves 48 equidistantly provided. The inner side surface of the guide groove 48 is slidably connected to a guide block 49, and 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 arranged on the side of the guide block 49 close to the clamping jaw 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 thrust, it can automatically reset.

[0029] Furthermore, the interior of the mounting seat 2 is provided with a plurality of groups of push rod grooves corresponding to the outer cylinder 4, the inner side surfaces of the push rod grooves are slidably connected to the push rods 411, the ends of all the push rods 411 are fixedly connected to the same ring seat 412, the inner wall of the ring seat 412 is annularly provided with a plurality of groups of limiting guide grooves 413, the inner side surfaces of the limiting guide grooves 413 are slidably connected to the limiting guide plates 414, a third spring 415 is fixedly connected between the limiting guide plates 414 and the inner wall of the limiting guide grooves 413, and the inner side surface of the end clamping groove 22 is slidably connected to the push cylinder 416 The inner side surface of the top cylinder 416 is slidably connected with a connecting rod 417, and a fourth spring 418 is connected between the connecting rod 417 and the inner wall of the top cylinder 416. The elastic coefficients of the third spring 415 and the fourth spring 418 are both greater than the elastic coefficients of the first spring 46 and the second spring 410. The elastic coefficient of the third spring 415 is consistent with that of the fourth spring 418. The limiting guide plate 414 is fixedly connected to the connecting rod 417, and an electric rod 419 is installed on the outside of the mounting seat 2, and the telescopic end of the electric rod 419 is fixedly connected to the connecting rod 417.

[0030] During operation, one end of the rotor shaft is placed in the clamping groove 31, and the electric rod 419 drives the connecting rod 417 to move toward the clamping jaws 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 provided on its inner wall cooperates with the pressure inclined surface 41 on the side of the clamping jaws 34 to apply a thrust force to the clamping jaws 34 to move toward each other, so that all the clamping jaws 34 approach each other and clamp the side of the rotor shaft. The movement of the connecting rod 417 also drives the top cylinder 416 to move, and the movement of the top cylinder 416 drives the end clamping column 23 to move. After the clamping claws 34 clamp the side of the rotor shaft, the end clamping column 23 moves to contact the end of the rotor shaft. 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 clamping column 23, the guide block 49 moves synchronously therewith and compresses the second spring 410. Therefore, after the top rod 411 and the top cylinder 416 move in the opposite direction and reset, the outer cylinder 4 and the end clamping column 23 can move in the opposite direction and reset under the action of the rebound force of the first spring 46 and the second spring 410.

[0031] Example 2: See also Figure 6This embodiment provides a technical solution based on the above embodiment: 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 tube 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 tube 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.

[0032] It should be noted that, during the process in which the outer cylinder 4 first moves and drives the clamping jaws 34 to move and clamp the side of the rotor shaft, the protrusion 45 moves and drives the first pressure plate 5 to move to press the first spring 46, causing the first spring 46 to compress and apply pressure to the clamping jaw 34. At this time, the pressure applied by the first spring 46 to the clamping jaw 34 is detected by the first pressure sensor 51. Similarly, the pressure applied by the fourth spring 418 to the end clamping column 23 is detected by the second pressure sensor 53. 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 values, the controller controls the electric rod 419 to stop driving. It should be further explained that during the setting process, the detection thresholds of the first pressure sensor 51 and the second pressure sensor 53 need to be set so that during the clamping process, the clamping pressure values ​​of the clamping jaws 34 and the end clamping column 23 can meet the needs of stable clamping and fixation of the rotor shaft.

[0033] Example 3: See also Figure 1 This embodiment provides a technical solution based on the above embodiment: driving 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 driving grooves 6 on both sides, and pillars 62 are symmetrically threaded on both sides of the bidirectional screw 61. The pillars 62 on both sides are fixedly connected to the two mounting seats 2 respectively, and the bidirectional screw 61 is driven by a motor, and the motor is electrically connected to the controller.

[0034] During operation, the bidirectional screw 61 is driven to rotate by the motor, so that the distance between the two mounting seats 2 can be adjusted as needed, and the installation and removal of the rotor shaft can be facilitated.

[0035] Example 4: See also Figure 2 - Figure 3 、 Figure 8, this embodiment provides a technical solution based on the above embodiment: the first annular groove and the second annular groove are both arranged through the surface of the mounting seat 2 near the clamping jaw 34, and the surface of the mounting seat 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 seat 2 are both provided with corresponding threaded holes 71, and the inner side surface of the threaded hole 71 is threadedly connected with a locking screw 72, the end of the rotating cylinder 21 is provided with an embedded annular groove 73, and 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 both provided with corresponding screw grooves 75, and the inner side surface of the screw groove 75 is threadedly connected with a fixing bolt 76.

[0036] It should be noted that the minimum inner diameter of the outer cylinder 4 is greater than the minimum outer diameter of the clamping jaws 34, that is, when the clamping jaws 34 move closer to each other to the extreme position, the distance between their outer side surfaces and the central axis of the connecting seat 3 is less than the minimum inner diameter of the outer cylinder 4, thereby ensuring that the outer cylinder 4 can pass smoothly through the clamping jaws 34.

[0037] During use, when the connecting seat 3 and the clamping jaws 34 need to be replaced for processing rotor shafts of different specifications, the sealing plate 7 can be removed by removing the locking screw 72. After that, the operator pulls the outer cylinder 4 outward so that the outer cylinder 4 can be moved outward and removed. At this time, the operator can remove the fixing bolts 76 to remove the connecting seat 3 for replacement, so that the connecting seat 3 and the clamping jaws 34 of appropriate specifications can be selected as needed.

[0038] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A clamping device for gear hobbing of a rotor shaft of an automobile starter, comprising a support (1), wherein position-adjustable clamping units are symmetrically arranged on both sides of the support (1), characterized in that: The clamping unit comprises a mounting seat (2) arranged on a support (1), one end of the mounting seat (2) is rotatably connected to a rotating drum (21), a side clamping mechanism is provided at the end of the rotating drum (21), an end clamping groove (22) corresponding to the rotating drum (21) is provided on the inner side surface of the mounting seat (2), an end clamping column (23) is slidably connected to the inner side surface of the end clamping groove (22), a driving unit is provided between the end clamping column (23) and the side clamping mechanism, and the driving unit is used to drive the side clamping mechanism to clamp the side surface of the rotor shaft and drive the end clamping column (23) to clamp the end of the rotor shaft.

2. The clamping device for gear hobbing of a rotor shaft of an automobile starter according to claim 1, characterized in that: The side clamping mechanism comprises a connecting seat (3) arranged at the end of the mounting seat (2), a clamping groove (31) is provided in the middle of the connecting seat (3) along its axial direction, the surface of the connecting seat (3) is annular and has three groups of guide grooves (32) equidistantly provided thereon, the inner side surface of the guide groove (32) is slidably connected to a guide block (33), the end of the guide block (33) is fixedly connected to a clamping claw (34), the clamping claw (34) is slidably connected to the surface of the connecting seat (3), and 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 a rotor shaft of an automobile starter according to claim 2, characterized in that: The clamping surface of the clamping jaw (34) is arranged in an arc shape, and the clamping surface of the clamping jaw (34) is arranged rough. The position and size specifications of the end clamping column (23) are adapted to the clamping groove (31).

4. The clamping device for gear hobbing of a rotor shaft of an automobile starter according to claim 3, characterized in that: The driving unit comprises a first annular groove provided inside the mounting seat (2), the inner side surface of the first annular groove being rotatably connected to the outer cylinder (4), a pressure inclined surface (41) being provided on the side of the clamping jaws (34) away from the clamping surface, and a driving inclined surface (42) corresponding to the pressure inclined surface (41) being provided on the inner wall of the outer cylinder (4), and when the driving inclined surface (42) moves along the surface of the pressure inclined surface (41) and applies a pressing force to the pressure inclined surface (41), all the clamping jaws (34) approach each other and clamp and fix the rotor shaft.

5. The clamping device for gear hobbing of a rotor shaft of an automobile starter according to claim 4, characterized in that: A second annular groove communicating with the first annular groove is provided inside the mounting seat (2), the inner side surface 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 surface of the first annular sleeve (43), the inner wall of the first annular sleeve (43) is annularly shaped and has a plurality of groups of straight grooves (44) equidistantly provided thereon, the inner side surface of the straight groove (44) is slidably connected to a protrusion (45), the protrusion (45) is fixedly connected to the side surface 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. The clamping device for gear hobbing of a rotor shaft of an automobile starter according to claim 5, characterized in that: A third annular groove communicating with the end clamp groove (22) is provided inside the mounting seat (2), and a second ring sleeve (47) is rotatably connected to the inner side surface of the third annular groove. The inner wall of the second ring sleeve (47) is annular and has multiple groups of guide grooves (48) equidistantly provided thereon. A guide block (49) is slidably connected to the inner side surface of the guide groove (48), and the guide block (49) is fixedly connected to the side surface of the end clamp column (23). A second spring (410) is connected between the guide block (49) and the inner wall of the guide groove (48).

7. The clamping device for gear hobbing of a rotor shaft of an automobile starter according to claim 6, characterized in that: The interior of the mounting seat (2) is provided with a plurality of groups of push rod grooves corresponding to the outer cylinder (4), the inner side surfaces of the push rod grooves are slidably connected to push rods (411), 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 annularly provided with a plurality of groups of limiting guide grooves (413), the inner side surfaces of the limiting guide grooves (413) are slidably connected to limiting guide plates (414), and the limiting guide plates (414) are fixedly connected to the inner walls of the limiting guide grooves (413). A third spring (415) is provided. The inner side surface of the end clamping groove (22) is slidably connected to a top cylinder (416). The inner side surface of the top cylinder (416) is slidably connected to a connecting rod (417). 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 seat (2). The telescopic end of the electric rod (419) is fixedly connected to the connecting rod (417).

8. The clamping device for gear hobbing of a rotor shaft of an automobile starter according to claim 7, 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), and the first pressure sensor (51), the second pressure sensor (53) and the electric rod (419) are all electrically connected to the controller.

9. The clamping device for gear hobbing of a rotor shaft of an automobile starter according to claim 8, characterized in that: Drive grooves (6) are symmetrically provided on both sides of the surface of the support (1), and a same bidirectional screw (61) is rotatably connected between the drive grooves (6) on both sides. Pillars (62) are symmetrically threaded on both sides of the bidirectional screw (61), and the pillars (62) on both sides 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 a controller.

10. The clamping device for gear hobbing of a rotor shaft of an automobile starter according to claim 8, characterized in that: The first annular groove and the second annular groove are both arranged on the side close to the clamping claw (34) through the surface of the mounting seat (2), and the surface of the mounting seat (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 seat (2) are both provided with corresponding threaded holes (71), and the inner side surface 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), and 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 both provided with corresponding screw grooves (75), and the inner side surface of the screw groove (75) is threadedly connected to a fixing bolt (76).

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