Clamping device for welding disc brake pad

Abstract

The invention discloses a clamping device for welding a disc brake pad, and relates to the technical field of welding. The problem of heat dissipation is solved. The device specifically comprises a mounting base, a plurality of supporting columns are fixed to the outer wall of the mounting base through bolts, an inner fluted disc and a fixing frame are fixed to the outer walls of the supporting columns correspondingly, a rotating disc is rotationally connected to the inner wall of the fixing frame, a clamping mechanism is arranged on the outer wall of the rotating disc, and a jacking column is arranged in the rotating disc. The clamping arms are arranged for circumferential clamping, meanwhile, the jacking columns are arranged for jacking the brake disc, so that a gap is formed between the brake disc and the rotary disc, the heat dissipation reliability is guaranteed, meanwhile, rising of the jacking columns and clamping movement of the clamping arms are achieved through rotation of the jacking columns, and therefore power synthesis is conducted; the synchronous linkage performance is improved, meanwhile, the multiple clamping arms can synchronously move, and therefore it is guaranteed that the position of the clamped brake disc is fixed, mutual positioning of a welding gun and the brake disc in the subsequent welding process is facilitated, and the subsequent welding precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and in particular to a clamping device used for welding a disc brake pad. Background Art

[0002] Disc brake pads, also known as brake discs, are disc-shaped and have accessories welded on the surface. When welding the accessories to the outer wall of the brake disc, the brake disc needs to be fixed, and then the accessories are fixed to the outer wall of the brake disc and welded using a welding gun.

[0003] After searching, the Chinese patent publication number CN215787774U discloses a welding clamping device, including a bracket arranged on the connecting plate, a positioning assembly located on the bracket, and a welding device located on the positioning assembly; it also includes a clamping assembly, the clamping assembly includes a rotating part located on the connecting plate, and at least three groups of clamping devices evenly arranged on the rotating part; the clamping device is used to limit the position of the workpiece, and the rotating part drives the workpiece to rotate so that a certain surface of the workpiece is located within the welding range of the welding device.

[0004] The above patent has the following deficiencies: after clamping and fixing, the workpiece fits with the clamping assembly. Therefore, during welding, since the workpiece will also generate heat, the non-welding surface of the workpiece fits with the clamping assembly, which makes it difficult to dissipate the heat and also causes the clamping assembly to heat up.

[0005] To this end, the present invention provides a clamping device for disc brake pad welding. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a clamping device for disc brake pad welding.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: A clamping device for disc brake pad welding, comprising a mounting seat, The outer wall of the mounting seat is fixed with a plurality of support columns by bolts, the outer walls of the support columns are respectively fixed with inner gear discs and fixing frames, the inner wall of the fixing frame is rotatably connected with a rotating disk, the outer wall of the rotating disk is provided with a clamping mechanism, and the interior of the rotating disk is provided with a top column; The clamping mechanism is composed of a plurality of clamping arms, which are slidably connected to the radial inner wall of the turntable in a circular array. An internal thread block is fixed to the bottom outer wall of the turntable, a top column is connected to the inner side of the internal thread block through a thread, and the outer wall of the top column is rotatably connected to a transition ring, the outer wall of the transition ring is rotatably connected to a connecting rod 1, and the other end of the connecting rod 1 is rotatably connected to the bottom end of the clamping arm.

[0008] Preferably: the top of the clamp arm is rotatably connected to the pressure arm, and the top side wall of the clamp arm is slidably connected to the clamp block through a rack slider, the side wall of the clamp block is buckled with a spring 1, the other end of the spring 1 is buckled to the outer wall of the clamp arm, and the top of the rack slider is meshed with the outer wall of the pressure arm.

[0009] Furthermore: an integrated driving unit is arranged above the mounting seat, and the integrated driving unit includes a locking ring, a gear, a gear ring 1 and a gear ring 2, the gear ring 2 is fixed to the bottom outer wall of the top column, the gear ring 1 is fixed to the inner wall of the internal thread block, and the top column can engage with the gear ring 1 and the gear ring 2 non-simultaneously.

[0010] On the basis of the above-mentioned scheme: the outer wall of the internal thread block is provided with a tooth groove, the locking ring can engage between the inner gear disc and the tooth groove at the same time, and a connecting frame is fixed to the bottom of the locking ring, the inner wall of the connecting frame is rotatably connected to the main shaft, the outer wall of the main shaft is matched with a sleeve through a key-shaped protrusion gap, and the bottom of the sleeve is transmission-matched with an electric motor, and the motor is fixed to the bottom outer wall of the mounting seat by bolts.

[0011] A better solution in the above solution is that the meshing stroke between the gear and the second gear ring is greater than the movement stroke of the top column.

[0012] As a further solution of the present invention: the bottom outer wall of the connecting frame is fixed with a permanent magnet by bolts, the top outer wall of the mounting seat located at the bottom of the permanent magnet is fixed with an electromagnet by bolts, and the same spring 2 is buckled on the opposite side of the connecting frame and the mounting seat.

[0013] At the same time, the end of the main shaft is connected to the inside of the gear through a key.

[0014] As a preferred embodiment of the present invention, the output shaft of the motor and the sleeve are transmission-matched via an over-limit separation mechanism.

[0015] At the same time, the over-limit separation mechanism comprises a transmission ring 1 and a transmission ring 2 which are rotatably connected to each other, and the transmission ring 1 and the transmission ring 2 are respectively fixed to the sleeve and the output shaft of the motor.

[0016] As a more optimal solution of the present invention: the inner wall of the transmission ring one is provided with a plurality of slots, the inner walls of the slots are matched with bayonet pins, the bayonet pins are slidably connected to the inner wall of the transmission ring two, and the inner outer wall of the transmission ring two is rotatably connected to the connecting rod two, the other end of the connecting rod two is rotatably connected to the bayonet pin, the side wall of the connecting rod two is buckled with a spring three, and the other end of the spring three is buckled to the transmission ring two.

[0017] The beneficial effects of the present invention are: 1. The present invention provides a clamping arm for circumferential clamping, and also provides a top column to lift the brake disc, so that a gap exists between the brake disc and the turntable, thereby ensuring the reliability of heat dissipation. At the same time, the rise of the top column and the clamping movement of the clamping arm are both realized by the rotation of the top column, thereby achieving power integration, increasing the synchronous linkage and enabling multiple clamping arms to move synchronously, thereby ensuring that the position of the brake disc is fixed after clamping, facilitating the mutual positioning of the welding gun and the brake disc during subsequent welding, and increasing the subsequent welding accuracy.

[0018] 2. The present invention, by setting a pressure arm, can limit the top of the brake disc, so that the longitudinal limit is also a rigid limit, which increases the stability of the clamping, and the rotation of the pressure arm depends on the movement of the clamping arm, thereby further realizing power integration and increasing synchronous linkage.

[0019] 3. The present invention, by setting up an integrated driving part, can drive the top column to rotate for clamping operation on the one hand, and can also drive the internal thread block to rotate on the other hand, so as to realize the replacement of welding position and improve welding efficiency. At the same time, the two are controlled by the position of the connecting frame, and power integration can be carried out, which further reduces the power source layout, and the electrical components in the entire power drive component are fixedly arranged, thereby preventing the wiring harness from being entangled or damaged by friction, thereby increasing safety.

[0020] 4. The present invention, by providing connecting rod two, transmission ring one, latch pin, transmission ring two, spring three and other components, can disengage transmission ring one from transmission ring two after clamping exceeds the limit, thereby preventing clamping damage to the workpiece. At the same time, the disengagement process is automatically controlled by the clamping force, without the need for manual or algorithm intervention, thereby simplifying the control logic. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of a clamping device for disc brake pad welding proposed by the present invention; Figure 2 A schematic diagram of the clamping mechanism structure of a clamping device for disc brake pad welding proposed by the present invention Figure 1 ; Figure 3 A schematic diagram of the clamping mechanism structure of a clamping device for disc brake pad welding proposed by the present invention Figure 2 ; Figure 4 A clamping device for disc brake pad welding proposed by the present invention Figure 2 The enlarged structural diagram of part A in the middle; Figure 5 A schematic diagram of the clamping arm structure of a clamping device for disc brake pad welding proposed by the present invention; Figure 6This is a schematic diagram of the structure of the integrated driving part of a clamping device for disc brake pad welding proposed by the present invention; Figure 7 A clamping device for disc brake pad welding proposed by the present invention Figure 6 The enlarged structural diagram of part B in the middle; Figure 8 The present invention provides a schematic structural diagram of an over-limit separation mechanism of a clamping device for disc brake pad welding.

[0022] In the figure: 1. mounting base; 2. supporting column; 3. internal gear disc; 4. fixing frame; 5. clamping mechanism; 6. rotating disk; 7. top column; 8. integrated driving part; 9. clamping arm; 10. internal threaded cylinder block; 11. tooth groove; 12. connecting rod one; 13. transition ring; 14. spring one; 15. clamping block; 16. pressing arm; 17. rack slider; 18. key-shaped protrusion; 19. main shaft; 20. motor; 21. sleeve; 22. electromagnet; 23. spring two; 24. permanent magnet; 25. connecting frame; 26. locking ring; 27. gear; 28. gear ring one; 29. ​​gear ring two; 30. connecting rod two; 31. transmission ring one; 32. bayonet pin; 33. bayonet groove; 34. transmission ring two; 35. spring three. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention. Embodiment 1

[0025] A clamping device for disc brake pad welding, such as Figure 1-Figure 8 As shown, it includes a mounting base 1, the outer wall of which is fixed with multiple support columns 2 by bolts, the outer walls of the support columns 2 are respectively fixed with inner gear plates 3 and fixed frames 4, the inner wall of the fixed frame 4 is rotatably connected with a turntable 6, the outer wall of the turntable 6 is provided with a clamping mechanism 5, and the interior of the turntable 6 is provided with a top column 7.

[0026] The clamping mechanism 5 is composed of a plurality of clamping arms 9, which are slidably connected to the radial inner wall of the turntable 6 in a circular array. An internal thread block 10 is fixed to the bottom outer wall of the turntable 6, and a top column 7 is connected to the inner side of the internal thread block 10 through threads. A transition ring 13 is rotatably connected to the outer wall of the top column 7, and a connecting rod 12 is rotatably connected to the outer wall of the transition ring 13. The other end of the connecting rod 12 is rotatably connected to the bottom end of the clamping arm 9.

[0027] When the device is in use, the brake disc can be placed above the turntable 6 and the top column 7, and then the top column 7 rotates. The threaded connection between the top column 7 and the internal thread block 10 will cause the top column 7 to rise, thereby lifting the brake disc upward. At the same time, the rise of the top column 7 will also drive the transition ring 13 to rise, thereby pulling the clamping arm 9 inward through the connecting rod 12 until the clamping arm 9 clamps the outer edge of the brake disc inward.

[0028] The device is provided with a clamping arm 9 for circumferential clamping, and a top column 7 is also provided to lift the brake disc, so that a gap exists between the brake disc and the turntable 6, thereby ensuring the reliability of heat dissipation. At the same time, the rise of the top column 7 and the clamping movement of the clamping arm 9 are both realized by the rotation of the top column 7, thereby performing power integration, increasing the synchronous linkage and enabling multiple clamping arms 9 to move synchronously, thereby ensuring that the position of the brake disc is fixed after clamping, facilitating the mutual positioning of the welding gun and the brake disc during subsequent welding, and increasing the subsequent welding accuracy.

[0029] To solve the stability problem; Figure 4 As shown, the top of the clamp arm 9 is rotatably connected to the pressure arm 16, and the top side wall of the clamp arm 9 is slidably connected to the clamp block 15 through the rack slider 17, the side wall of the clamp block 15 is buckled with a spring 14, the other end of the spring 14 is buckled to the outer wall of the clamp arm 9, and the upper part of the rack slider 17 is meshed with the outer wall of the pressure arm 16.

[0030] When the clamp arm 9 clamps inwardly, until the clamp block 15 contacts the outer edge of the brake disc, the clamp block 15 is limited. At this time, the clamp arm 9 continues to move inwardly, and the clamp block 15 shrinks into the clamp arm 9, thereby driving the pressure arm 16 to rotate through the rack slider 17 until the pressure arm 16 rotates to the top of the brake disc and completes the clamping.

[0031] The device, by setting a pressure arm 16, can limit the top of the brake disc, so that the longitudinal limit is also a rigid limit, which increases the stability of clamping, and the rotation of the pressure arm 16 depends on the movement of the clamping arm 9, thereby further realizing power integration and increasing synchronous linkage.

[0032] To solve the driver problem; Figure 1 , 6 As shown in Figures 7 and 8, an integrated driving unit 8 is arranged above the mounting seat 1, and the integrated driving unit 8 includes a locking ring 26, a gear 27, a gear ring 1 28 and a gear ring 29. The gear ring 29 is fixed to the bottom outer wall of the top column 7, and the gear ring 1 28 is fixed to the inner wall of the internal thread block 10. The meshing stroke of the gear 27 and the gear ring 2 29 is greater than the movement stroke of the top column 7, and the top column 7 can mesh with the gear ring 1 28 and the gear ring 2 29 non-simultaneously.

[0033] The outer wall of the internal thread block 10 is provided with a tooth groove 11, and the locking ring 26 can be engaged between the internal gear disc 3 and the tooth groove 11 at the same time, and a connecting frame 25 is fixed to the bottom of the locking ring 26, and the inner wall of the connecting frame 25 is rotatably connected to the main shaft 19, and the outer wall of the main shaft 19 is gap-fitted with a sleeve 21 through a key-shaped protrusion 18, and the bottom of the sleeve 21 is transmission-fitted with a motor 20, and the motor 20 is fixed to the bottom outer wall of the mounting base 1 by bolts.

[0034] The bottom outer wall of the connecting frame 25 is fixed with a permanent magnet 24 by bolts, and the top outer wall of the mounting seat 1 located at the bottom of the permanent magnet 24 is fixed with an electromagnet 22 by bolts, and the connecting frame 25 and the mounting seat 1 are buckled with the same spring 23 on the opposite side, and the end of the main shaft 19 is connected to the inside of the gear 27 by a key.

[0035] When in the clamping state, current is passed through the electromagnet 22 at this time, so that the electromagnet 22 and the permanent magnet 24 generate magnetic repulsion, so that the permanent magnet 24 drives the connecting frame 25 to move upward, so that on the one hand, the locking ring 26 is meshed between the inner toothed disc 3 and the tooth groove 11, and the internal thread block 10 and the internal toothed disc 3 are in a locked state. On the other hand, the main shaft 19 is driven to rise, so that the gear 27 is meshed with the ring gear 29. When the motor 20 is started, it can drive the top column 7 to rotate. After clamping, and welding one of the positions, it is necessary to rotate and weld another position. At this time, a reverse current is passed through the electromagnet 22, so that the electromagnet 22 and the permanent magnet 24 generate magnetic attraction, so that the permanent magnet 24 drives the connecting frame 25 to move downward, so that the gear 27 is meshed with the ring gear 28, and the locking ring 26 is disengaged from the inner toothed disc 3 and the tooth groove 11. When the motor 20 is started, the internal thread block 10 can be driven to rotate, thereby driving the brake disc to rotate.

[0036] The device is provided with an integrated driving part 8, which can drive the top column 7 to rotate for clamping operation on the one hand, and can also drive the internal thread block 10 to rotate on the other hand, so as to achieve the replacement of welding position and improve welding efficiency. At the same time, the two are controlled by the position of the connecting frame 25, and power integration can be carried out, which further reduces the layout of the power source, and the electrical components in the entire power drive component are fixedly arranged, thereby preventing the wiring harness from being entangled or damaged by friction, thereby increasing safety.

[0037] When the present embodiment is in use, the brake disc can be placed above the rotating disc 6 and the top column 7, and then the top column 7 rotates. The threaded connection between the top column 7 and the internal thread block 10 will cause the top column 7 to rise, thereby lifting the brake disc upward. At the same time, the rise of the top column 7 will also drive the transition ring 13 to rise, thereby pulling the clamping arm 9 inward through the connecting rod 12 until the clamping arm 9 clamps the outer edge of the brake disc inwardly. When the clamping arm 9 clamps inwardly until the clamping block 15 contacts the outer edge of the brake disc, the clamping block 15 is limited. At this time, the clamping arm 9 continues to move inwardly, and the clamping block 15 contracts into the clamping arm 9, thereby driving the pressure arm 16 to rotate through the rack slider 17 until the pressure arm 16 rotates to the top of the brake disc and completes the clamping. When in the clamping state, current is passed through the electromagnet 22 at this time, so that the electromagnet 22 and the permanent magnet 24 generate Magnetic repulsion causes the permanent magnet 24 to drive the connecting frame 25 to move upward, so that on the one hand, the locking ring 26 is meshed between the inner toothed disc 3 and the tooth groove 11. At this time, the internal thread block 10 and the inner toothed disc 3 are in a locked state. On the other hand, it drives the main shaft 19 to rise, so that the gear 27 is meshed with the ring gear 29. When the motor 20 is started, it can drive the top column 7 to rotate. After clamping and welding one of the positions, it is necessary to rotate and weld another position. At this time, a reverse current is passed into the electromagnet 22, so that the electromagnet 22 and the permanent magnet 24 generate magnetic attraction, so that the permanent magnet 24 drives the connecting frame 25 to move downward, so that the gear 27 is meshed with the ring gear 28, and the locking ring 26 is disengaged from the inner toothed disc 3 and the tooth groove 11. When the motor 20 is started, the internal thread block 10 can be driven to rotate, thereby driving the brake disc to rotate. Embodiment 2

[0038] A clamping device for disc brake pad welding, such as Figure 8 As shown, in order to solve the safety problem, this embodiment makes the following improvements on the basis of embodiment 1: the output shaft of the motor 20 and the sleeve 21 are matched through an over-limit separation mechanism.

[0039] The over-limit separation mechanism includes a transmission ring 1 31 and a transmission ring 2 34 which are rotatably connected to each other. The transmission ring 1 31 and the transmission ring 2 34 are respectively fixed to the sleeve 21 and the output shaft of the motor 20 .

[0040] The inner wall of the transmission ring 1 31 is provided with a plurality of slots 33 , and the inner wall of the slots 33 is matched with a bayonet 32 ​​, and the bayonet 32 ​​is slidably connected to the inner wall of the transmission ring 2 34 , and the inner outer wall of the transmission ring 2 34 is rotatably connected to the connecting rod 2 30 , and the other end of the connecting rod 2 30 is rotatably connected to the bayonet 32 ​​.

[0041] The side wall of the second connecting rod 30 is buckled with a third spring 35 , and the other end of the third spring 35 is buckled with the second transmission ring 34 .

[0042] When this embodiment is in use, during the clamping process, since the connecting rod 2 30 is subjected to the elastic force of the spring 35, it has a rotational resistance, and the rotational resistance can transmit torque, so that the transmission ring 2 34 and the transmission ring 1 31 transmit torque. When the clamping force is large, the transmission ring 2 34 will rotate relative to the transmission ring 1 31, so that the connecting rod 2 30 can be used to pull the pin 32 out of the slot 33. At this time, the transmission ring 1 31 and the transmission ring 2 34 do not transmit.

[0043] The device is provided with connecting rod 2 30, transmission ring 1 31, latch 32, transmission ring 2 34, spring 35 and other components, which can make transmission ring 1 31 and transmission ring 2 34 disengage from each other after clamping exceeds the limit, thereby preventing clamping damage to the workpiece. At the same time, the disengagement process is automatically controlled by the clamping force, without the need for manual or algorithm intervention, thereby simplifying the control logic.

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A clamping device for disc brake pad welding, comprising a mounting seat (1), characterized in that: The outer wall of the mounting seat (1) is fixed with a plurality of support columns (2) by means of bolts, the outer walls of the support columns (2) are respectively fixed with inner gear discs (3) and fixing frames (4), the inner wall of the fixing frame (4) is rotatably connected with a rotating disk (6), the outer wall of the rotating disk (6) is provided with a clamping mechanism (5), and a top column (7) is provided inside the rotating disk (6); The clamping mechanism (5) is composed of a plurality of clamping arms (9), which are slidably connected to the radial inner wall of the turntable (6) in a circular array, an internal thread block (10) is fixed to the bottom outer wall of the turntable (6), a top column (7) is connected to the inner side of the internal thread block (10) through a thread, and the outer wall of the top column (7) is rotatably connected to a transition ring (13), the outer wall of the transition ring (13) is rotatably connected to a connecting rod (12), and the other end of the connecting rod (12) is rotatably connected to the bottom end of the clamping arm (9).

2. A clamping device for disc brake pad welding according to claim 1, characterized in that: The top of the clamp arm (9) is rotatably connected to a pressure arm (16), and the top side wall of the clamp arm (9) is slidably connected to a clamp block (15) via a rack slider (17); the side wall of the clamp block (15) is buckled with a spring 1 (14); the other end of the spring 1 (14) is buckled with the outer wall of the clamp arm (9), and the upper part of the rack slider (17) is meshed with the outer wall of the pressure arm (16).

3. A clamping device for disc brake pad welding according to claim 1, characterized in that: An integrated driving unit (8) is arranged above the mounting seat (1), and the integrated driving unit (8) comprises a locking ring (26), a gear (27), a first gear ring (28), and a second gear ring (29), wherein the second gear ring (29) is fixed to the bottom outer wall of the top column (7), and the first gear ring (28) is fixed to the inner wall of the internal thread block (10), and the top column (7) can mesh with the first gear ring (28) and the second gear ring (29) at different times.

4. A clamping device for disc brake pad welding according to claim 3, characterized in that: The outer wall of the internal thread block (10) is provided with a tooth groove (11), and the lock ring (26) can be meshed between the inner toothed disc (3) and the tooth groove (11) at the same time, and a connecting frame (25) is fixed to the bottom of the lock ring (26), and the inner wall of the connecting frame (25) is rotatably connected to the main shaft (19), and the outer wall of the main shaft (19) is gap-fitted with a sleeve (21) through a key-shaped protrusion (18), and the bottom of the sleeve (21) is transmission-fitted with a motor (20), and the motor (20) is fixed to the bottom outer wall of the mounting seat (1) by bolts.

5. A clamping device for disc brake pad welding according to claim 4, characterized in that: The meshing stroke of the gear (27) and the second gear ring (29) is greater than the movement stroke of the top column (7).

6. A clamping device for disc brake pad welding according to claim 4, characterized in that: A permanent magnet (24) is fixed to the bottom outer wall of the connecting frame (25) by means of bolts, an electromagnet (22) is fixed to the top outer wall of the mounting seat (1) located at the bottom of the permanent magnet (24) by means of bolts, and a same spring 2 (23) is buckled on the opposite side of the connecting frame (25) and the mounting seat (1).

7. A clamping device for disc brake pad welding according to claim 6, characterized in that: The end of the main shaft (19) is connected to the inside of the gear (27) via a key.

8. The clamping device for disc brake pad welding according to claim 4, characterized in that: The output shaft of the motor (20) and the sleeve (21) are in transmission cooperation via an overrunning separation mechanism.

9. A clamping device for disc brake pad welding according to claim 8, characterized in that: The over-limit separation mechanism comprises a transmission ring 1 (31) and a transmission ring 2 (34) which are rotatably connected to each other, and the transmission ring 1 (31) and the transmission ring 2 (34) are respectively fixed to the sleeve (21) and the output shaft of the motor (20).

10. A clamping device for disc brake pad welding according to claim 9, characterized in that: The inner wall of the transmission ring 1 (31) is provided with a plurality of slots (33), the inner walls of the slots (33) are matched with a bayonet (32), the bayonet (32) is slidably connected to the inner wall of the transmission ring 2 (34), and the inner outer wall of the transmission ring 2 (34) is rotatably connected to the connecting rod 2 (30), the other end of the connecting rod 2 (30) is rotatably connected to the bayonet (32), the side wall of the connecting rod 2 (30) is buckled with a spring 3 (35), the other end of the spring 3 (35) is buckled to the transmission ring 2 (34).

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