Single-cylinder small dragging diaphragm spring pressing clutch mechanism

Abstract

The utility model relates to the technical field of tractor clutches, in particular to a single-cylinder small dragging diaphragm spring compression clutch mechanism, which comprises a pressure plate assembly and a clutch driven plate, the pressure plate assembly comprises a clutch cover fixed on a clutch belt wheel, a pressure plate is arranged in the clutch cover, a transmission sheet is connected between the pressure plate and the clutch cover, and the transmission sheet is connected with the clutch driven plate through a transmission shaft. A conical diaphragm spring is further arranged in the clutch cover, a separating hook matched with the diaphragm spring is arranged on the rear side of the pressure plate, under the pressure of the diaphragm spring, pressing force applied by the diaphragm spring is evenly distributed on the pressure plate, the pressing force is large, disengaging is not prone to occurring, clutch is reliable, static friction among the pressure plate, the friction lining and the clutch belt wheel is almost in rigid connection, and the clutch effect is good. The load of the clutch driven disc belt is synchronous with the clutch belt wheel, the transmission power is increased, stability and reliability are achieved, and the transmission efficiency is high. A damping spring on the damper disc can absorb impact and torsional vibration, and input power is stable and constant.

Description

Technical Field

[0001] This utility model relates to the field of tractor clutch technology, specifically to a single-cylinder small tractor diaphragm spring pressing clutch mechanism. Background Technology

[0002] The clutch is a device used to transmit power between the engine and the transmission. When the driver depresses the clutch pedal, the power connection between the engine and the transmission is disconnected; when the driver releases the clutch pedal, the power connection between the engine and the transmission is reconnected. Figure 1 This is a schematic diagram of a traditional clutch, such as... Figure 1 As shown, in a conventional clutch, the driven clutch plate assembly 1-1, the driving clutch plate 1-2, and the pressure clutch plate 1-3 are housed within the clutch pulley 1-4. The clutch pulley cover 1-6 is bolted to the clutch pulley 1-4. A clutch spring 1-5 is located between the pressure clutch plate 1-3 and the clutch pulley 1-4. The clutch pulley 1-4 is mounted on the clutch pulley shaft 1-7 via bearings. The two driven clutch plate assemblies 1-1 are connected to the clutch pulley shaft 1-7 via splines. The driving clutch plate 1-2 is loosely fitted onto the clutch pulley shaft 1-7. The clutch ring is engaged in the inner groove of the clutch pulley 1-4 and can slide axially. A release bearing 1-9 is fitted on the clutch pulley shaft 1-7. A clutch release pawl 1-8 and a release lever 1-10 are connected to the release bearing 1-9. There are three release levers 1-10, each connected to the clutch pressure plate 1-3 via a connecting rod. When the clutch pedal is depressed, the clutch release pawl 1-8 rotates. Under the action of the release bearing 1-9, the release levers 1-10 swing inward, causing the clutch pressure plate 1-3 to separate from the clutch drive plate 1-2, interrupting power transmission. This current clutch uses three release levers for disengagement and three pairs of helical clutch springs as the clamping device. The clutch clamping force is distributed at three points, resulting in uneven pressure and wear, making it prone to disengagement. Furthermore, it lacks shock absorption and vibration filtering functions, leading to uneven clutch engagement and disengagement. Utility Model Content

[0003] The present invention aims to provide a single-cylinder small tractor diaphragm spring pressing clutch mechanism to solve the technical problems of uneven clutch pressure and unstable power transmission in existing small tractor clutches.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] Design a single-cylinder small-diaphragm spring clutch mechanism, including a clutch pulley shaft mounted on a gearbox, a clutch pulley mounted on one side of the clutch pulley shaft via a first bearing, a pressure plate assembly and a clutch driven plate, the pressure plate assembly including a clutch cover fixed to the clutch pulley, a pressure plate disposed within the clutch cover, and a transmission plate connecting the pressure plate and the clutch cover; a conical diaphragm spring is also disposed within the clutch cover, and a release hook matching the diaphragm spring is disposed on the rear side of the pressure plate, the diaphragm of the diaphragm spring being... The clutch spring has an inner ring that protrudes rearward from a hole in the center of the rear side of the clutch cover. Multiple first rivets are provided between the diaphragm spring and the clutch cover. A front support ring and a rear support ring surrounding the first rivets are respectively provided on the front and rear sides of the diaphragm spring. A release bearing and a clutch release claw are provided on the clutch pulley shaft, located behind the inner ring of the diaphragm. The clutch driven disc includes a friction lining located between the clutch pulley and the pressure plate. The center of the clutch driven disc is keyed to the clutch pulley shaft.

[0006] Furthermore, the clutch driven disc also includes a torsional damper, which includes a driven steel plate fixed inside the friction lining. The driven steel plate is connected to the damper disc and the damper cover by a second rivet. The damper disc is sandwiched between the driven steel plate and the damper cover. The damper disc is provided with a plurality of spring grooves, and damping springs are respectively provided in the spring grooves. The driven steel plate and the damper cover are respectively provided with slots that match the springs, and spring covers are provided on the outside of the slots.

[0007] Furthermore, the outer periphery of the clutch cover is provided with a transmission plate mounting groove, and the two ends of the transmission plate are respectively connected to the pressure plate and the clutch cover by a third rivet.

[0008] Furthermore, the clutch cover is fixedly connected to the clutch pulley by bolts.

[0009] Furthermore, the section on the clutch pulley shaft used for mounting the clutch pulley, clutch driven disc, and release bearing is thicker than other sections.

[0010] Furthermore, the clutch pulley shaft is mounted on the gearbox via a positioning bearing on the side near the clutch pulley. A bearing end cover for positioning the positioning bearing is provided on the clutch pulley shaft, and a positioning sleeve is provided on the clutch pulley shaft. The release bearing, clutch release pawl, and bearing end cover are all fitted onto the positioning sleeve.

[0011] Compared with existing technologies, the advantages of this invention are as follows: Under the pressure of the diaphragm spring, the clamping force applied by the diaphragm spring is evenly distributed on the pressure plate, resulting in a large clamping force, making disengagement difficult and ensuring reliable clutch engagement. The static friction between the pressure plate, friction lining, and clutch pulley creates a near-rigid connection, ensuring that the load on the clutch driven disc is synchronized with the clutch pulley, increasing transmission power and providing stable and reliable transmission efficiency. The damping spring on the shock absorber disc absorbs impact and torsional vibrations, ensuring a smooth and constant input power. By setting a positioning sleeve and a specially designed bearing end cover, the bearing end cover, clutch release pawl, and release bearing can be integrated into a single unit, resulting in a compact structure that improves the accuracy of the axial movement distance of the release bearing when the clutch release pawl swings. Attached Figure Description

[0012] The present invention will be explained in detail below with reference to the accompanying drawings. It should be noted that the drawings are used to provide a further understanding of the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but should not impose any limitation on the implementability of the present invention.

[0013] In the attached diagram:

[0014] Figure 1 This is a schematic diagram of the structure of an existing clutch assembly, in which... Figure 1 - (a) is the main view. Figure 1 - (b) is a schematic diagram of the internal structure.

[0015] Figure 2 This is a side view of the trailer frame and gearbox equipped with the single-cylinder small trailer diaphragm spring pressing clutch mechanism of this utility model.

[0016] Figure 3 This is a schematic diagram of the installation of a single-cylinder diaphragm spring pressing clutch mechanism of this utility model on a small trailer.

[0017] Figure 4 This is a schematic diagram of an embodiment of the single-cylinder small drag diaphragm spring pressing clutch mechanism of this utility model.

[0018] Figure 5 This is a schematic diagram of the pressure plate assembly in one embodiment of the single-cylinder small drag diaphragm spring pressing clutch mechanism of this utility model, wherein... Figure 5 - (a) is a rear view of the pressure plate assembly. Figure 5 - (b) is a side view of the pressure plate assembly. Figure 5 - (c) is a cross-sectional view of the pressure plate assembly.

[0019] Figure 6 This is a schematic diagram of the clutch driven plate in one embodiment of the single-cylinder small drag diaphragm spring pressing clutch mechanism of this utility model, wherein... Figure 6 - (a) is a rear view of the clutch driven disc. Figure 6 - (b) is a cross-sectional view of the clutch driven disc.

[0020] Figure 7 This is a schematic diagram of the shock absorber disc of the clutch driven disc in one embodiment of the single-cylinder small-diaphragm spring-pressed clutch mechanism of this utility model, wherein... Figure 7 - (a) is a rear view of the shock absorber disc. Figure 7 - (b) is a cross-sectional view of the shock absorber disc.

[0021] In the picture:

[0022] Clutch driven plate assembly 1-1, clutch driving plate 1-2, clutch pressure plate 1-3, clutch pulley 1-4, clutch spring 1-5, clutch pulley cover 1-6, clutch pulley shaft 1-7, clutch release pawl 1-8, release bearing 1-9, release lever 1-10;

[0023] 1. Clutch pedal; 2. Brake pedal; 3. Clutch shaft; 4. Brake sleeve; 5. Brake rocker arm; 6. Clutch rocker arm; 7. Right end cover; 8. Clutch release pawl; 9. Clutch pulley shaft; 10. Pressure plate assembly; 11. Clutch pulley; 12. Clutch driven plate; 13. Brake cam rocker arm; 14. Gearbox; 15. Small trailer frame.

[0024] 2-1 clutch pulley, 2-2 inner bearing, 2-3 outer bearing, 2-4 inner diaphragm ring, 2-5 release bearing, 2-6 friction lining, 2-7 pressure plate, 2-7-1 release hook, 2-8 front support ring, 2-9 diaphragm spring, 2-10 clutch linkage, 2-11 positioning sleeve, 2-12 outer diaphragm ring, 2-13 rear support ring, 2-14 first rivet, 2-15 positioning bearing, 2-16 clutch cover, 2-17 transmission plate, 2-18 driven steel plate, 2-19 damping spring, 2-20 damper disc, 2-21 damper outer cover, 2-21-1 slot, 2-21-2 spring cover, 2-22. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0027] In one embodiment, a single-cylinder small drag diaphragm spring pressing clutch mechanism is provided, such as Figure 1 As shown, the single-cylinder small tractor diaphragm spring pressing clutch mechanism is used to install on the gearbox 14 of the single-cylinder small tractor (i.e., small tractor), and the gearbox 14 is mounted on the small tractor frame 15.

[0028] like Figure 2 As shown, the single-cylinder small drag diaphragm spring clutch mechanism includes a clutch pulley shaft 9 mounted on the gearbox 14. A clutch pulley 11 is mounted on one side of the clutch pulley shaft 9 via a first bearing. Two first bearings are spaced apart in the clutch pulley 11 to ensure the stability of the clutch pulley 11.

[0029] It also includes the pressure plate assembly 10 and the clutch driven plate 12, such as Figure 4-5 As shown, the pressure plate assembly 10 includes a clutch cover 2-16 fixed to the clutch pulley 11. The clutch cover 2-16 is an annular cover, with its front side connected to the clutch pulley 11 and a hole in the center of its rear side. A pressure plate 2-7 is disposed in the clutch cover 2-16, as shown. Figure 5As shown in (b), a transmission plate 2-17 connects the pressure plate 2-7 and the clutch cover 2-16. The transmission plate 2-17 positions the pressure plate 2-7 within the clutch cover 2-16. A conical diaphragm spring 2-9 is also provided in the clutch cover 2-16. The diaphragm spring 2-9 is a butterfly-shaped steel plate. A release hook 2-7-1 matching the diaphragm spring 2-9 is provided on the rear side of the pressure plate 2-7. The outer ring 2-12 of the diaphragm spring 2-9 is located in the release hook 2-7-1, which is an annular groove that serves to embed the outer ring 2-12. The inner ring 2-4 of the diaphragm spring 2-9 extends from the hole in the middle of the rear side of the clutch cover 2-16. The diaphragm spring 2-9 protrudes rearward to be pushed by the release bearing. Multiple first rivets 2-14 are located between the diaphragm spring 2-9 and the clutch cover 2-16. The first rivets 2-14 are positioned at the waist of the diaphragm spring 2-9. A front support ring 2-8 and a rear support ring 2-13, respectively, surround the first rivets 2-14 on the front and rear sides of the diaphragm spring 2-9. Both the front support ring 2-8 and the rear support ring 2-13 are wire rings, serving as support points when the diaphragm spring 2-9 deforms. A release bearing 2-5 and a clutch release pawl 8 are located on the clutch pulley shaft 9, behind the inner ring 2-4 of the diaphragm. When the clutch release pawl 8 rotates, it drives the release bearing 2-5 to move axially, thereby pushing the inner ring 2-4 of the diaphragm and causing the diaphragm spring 2-9 to deform. The clutch driven disc 12 includes a friction lining 2-6 located between the clutch pulley 11 and the pressure plate 2-7. The middle part of the clutch driven disc 12 is keyed to the clutch pulley shaft 9. When the pressure plate 2-7 applies pressure to the friction lining 2-6, the friction lining 2-6 is further pressed against the side of the clutch pulley 11.

[0030] The working principle of this single-cylinder small-diaphragm spring-pressed clutch mechanism is as follows:

[0031] 1. Power transmission process:

[0032] When the clutch cover 2-16 is fixed on the clutch pulley 11, the diaphragm spring 2-9 undergoes elastic deformation under the pressure of the clutch cover 2-16. The outer ring 2-12 of the diaphragm, located on the outer circumference of the diaphragm spring 2-9, applies pressure to the pressure plate 2-7, pressing the clutch driven plate 12. The clutch driven plate 12 is connected to the clutch pulley shaft 9 through a spline. After the clutch driven plate 12 is pressed onto the clutch pulley 11, the friction lining 2-6 of the clutch driven plate 12 engages with the clutch pulley 11, transmitting power to the clutch pulley shaft 9, thereby transferring power from the diesel engine to the gearbox 14.

[0033] 2. Interruption of power process:

[0034] Combination Figure 2-4As shown, when the clutch pedal 1 is pressed, the connecting rod of the clutch pedal 1 drives the clutch shaft 3 mounted on the small trailer frame 15 to rotate via a flat key. The clutch shaft 3 further drives the clutch rocker arm 6 to swing via a flat key, and the clutch rocker arm 6 pulls the clutch connecting rod 2-10 ( Figure 4 (The clutch linkage is for illustration purposes.) The clutch linkage 2-10 drives the clutch release pawl 8 to swing, and pushes the release bearing 2-5 to move along the clutch pulley shaft 9 towards the clutch pulley 11. The release bearing 2-5 presses against the inner ring 2-4 of the diaphragm spring 2-9. The diaphragm spring 2-9 uses the front support ring 2-8 as a fulcrum and leverages the force, causing the edge of the diaphragm spring 2-9 to deform and warp. The outer ring 2-13 of the diaphragm pulls back the pressure plate 2-7, and the pressure plate 2-7 no longer applies pressure to the friction lining 2-6, thus separating the power transmission from the clutch pulley 11. The clutch pulley 11 is loosely fitted on the clutch pulley shaft 9 through the inner and outer first bearings, causing the clutch pulley 11 to rotate freely. The movement of the clutch pulley 11 is separated from the rotation of the clutch pulley shaft 9, interrupting the power transmission.

[0035] Compared to the current spring-pressed clutch, this single-cylinder small tractor diaphragm spring-pressed clutch mechanism uses a diaphragm spring 2-9, which is mounted on the clutch cover 2-16 by multiple first rivets 2-14. A front support ring 2-8 and a rear support ring 2-13 are respectively provided around the first rivets 2-14 on the front and rear sides of the diaphragm spring 2-9. The front support ring 2-8 and the rear support ring 2-13 act as a fulcrum, so that the butterfly-shaped diaphragm spring 2-9 can apply pressure to the pressure plate 2-7 in the circumferential direction. The pressure plate 2-7 receives uniform pressure, the friction lining 2-6 wears evenly, and the power transmission is more stable, effectively improving the smoothness of power transmission between the engine and the gearbox of the small tractor.

[0036] Furthermore, such as Figure 4 , Figure 6 and Figure 7 As shown, the clutch driven disc 12 also includes a torsional damper, which is used to dampen vibrations during the transmission of torsional force. The torsional damper includes a driven steel plate 2-18 fixed inside the friction lining 2-6. The driven steel plate 2-18 is connected to the damper disc 2-20 and the damper outer cover 2-21 by a second rivet. The driven steel plate 2-18 and the damper outer cover 2-21 are respectively clamped on both sides of the damper disc 2-20. Each driven steel plate 2-18 and the damper outer cover 2-21 has a... The shock absorber disc 2-20 has six rivet holes and six corresponding rivet slots for the rivets to pass through. After being connected by a second rivet, the shock absorber disc 2-20 is clamped between the driven steel plate 2-18 and the shock absorber outer cover 2-21. The shock absorber disc 2-20 has multiple spring slots, each containing a shock-absorbing spring 2-19. The driven steel plate 2-18 and the shock absorber outer cover 2-21 each have matching slots for the springs, and spring covers are provided on the outside of the slots. Figure 6 As shown, taking the shock absorber outer cover 2-21 as an example, its cover is provided with six slots 2-21-1 that match the springs. A spring cover 2-21-2 is provided on the outside of the slots 2-21-1. One side of the shock absorber spring 2-19 is locked in the slots 2-21-1, and the spring cover 2-21-2 prevents the shock absorber spring 2-19 from falling off.

[0037] The damping principle of the torsional shock absorber in the clutch driven disc is as follows: The engine torque is transmitted to the driven steel plate 2-18 through the friction lining 2-6, and then to the shock absorber disc 2-20, which is riveted between the driven steel plate 2-18 and the outer cover 2-21 of the shock absorber, through the damping spring 2-19. After the shock and torsional vibration are absorbed by the damping spring 2-19 on the shock absorber disc 2-20, the power is transmitted to the shock absorber disc 2-20 and the inner spline. Finally, the clutch pulley shaft 9 of the gearbox 14 receives the filtered power through the spline.

[0038] Furthermore, such as Figure 5 As shown in (b), the outer periphery of the clutch cover 2-16 is provided with a transmission plate mounting groove. The two ends of the transmission plate 2-17 are respectively connected to the pressure plate 2-7 and the clutch cover 2-16 by the third rivet. One end of the transmission plate 2-17 is bent. When the pressure plate 2-7 moves backward along the axial direction to disengage from the power transmission, the transmission plate 2-17 will undergo elastic deformation.

[0039] Furthermore, such as Figure 4 As shown, flanges are provided at the front end of the clutch cover 2-16 and the rear end of the clutch pulley 11. The clutch cover 2-16 is fixedly connected to the clutch pulley 11 by bolts. This connection method is relatively tight and easy to disassemble.

[0040] Furthermore, such as Figure 3-4 As shown, the section on the clutch pulley shaft 9 used to install the clutch pulley 11, the clutch driven disc 12, and the release bearing 2-5 is thicker than the corresponding section of the conventional clutch mechanism, thus improving bending strength.

[0041] Furthermore, such as Figure 3-4 As shown, the clutch pulley shaft 9 is mounted on the gearbox 14 via a positioning bearing 2-15 on the side near the clutch pulley 11. A bearing end cover 2-22 is provided on the clutch pulley shaft 9 to position the positioning bearing 2-15, and a positioning sleeve 2-11 is also provided on the clutch pulley shaft 9. The clutch release pawl 8 and the bearing end cover 2-22 are uniformly fitted on the positioning sleeve 2-11. The release bearing 2-5 is fitted on the outer circle of the boss of the clutch release pawl 8. By setting the positioning sleeve 2-11 and the specially made bearing end cover 2-22, the bearing end cover 2-22, the clutch release pawl 8 and the release bearing 2-5 can be integrated into one unit. The structure is compact, which is beneficial to improving the accuracy of the axial movement distance of the release bearing 2-5 when the clutch release pawl 8 swings.

[0042] Based on the above embodiments, the single-cylinder small-trailer diaphragm spring-pressed clutch mechanism has the following structural features: 1. Under the pressure of the diaphragm spring 2-9, and with the pressing force applied by the diaphragm spring 2-9 evenly distributed on the pressure plate 2-7, the pressing force is large, making it difficult to disengage and ensuring reliable clutch engagement. The static friction between the pressure plate 2-7, the friction lining 2-6, and the clutch pulley 11 is almost a rigid connection, ensuring that the load of the clutch driven disc 12 is synchronized with the clutch pulley 11, resulting in increased and stable transmission power and high transmission efficiency. 2. The damping spring 2-19 on the damper disc 2-20 can absorb impact and torsional vibration, ensuring a stable and constant input power.

[0043] It should be noted that, unless otherwise defined, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains, and those terms defined herein, such as those in a common dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art.

[0044] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Those skilled in the art will readily understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. Therefore, all such modifications are intended to be included within the scope of this disclosure as defined in the claims, and will not be detailed herein.

Claims

1. A single-cylinder small-diaphragm spring-loaded clutch mechanism, comprising a clutch pulley shaft mounted on a gearbox, wherein a clutch pulley is mounted on one side of the clutch pulley shaft via a first bearing, characterized in that: It also includes a pressure plate assembly and a clutch driven plate. The pressure plate assembly includes a clutch cover fixed to the clutch pulley, a pressure plate is disposed in the clutch cover, and a transmission plate is connected between the pressure plate and the clutch cover. A conical diaphragm spring is also disposed in the clutch cover, and a release hook matching the diaphragm spring is disposed on the rear side of the pressure plate. The outer ring of the diaphragm spring is disposed in the release hook, and the inner ring of the diaphragm spring protrudes rearward from a hole in the middle of the rear side of the clutch cover. A plurality of first rivets are disposed between the diaphragm spring and the clutch cover. A front support ring and a rear support ring surrounding the first rivets are respectively disposed on the front and rear sides of the diaphragm spring. A release bearing and a clutch release claw are disposed on the clutch pulley shaft located on the rear side of the inner ring of the diaphragm. The clutch driven plate includes a friction lining located between the clutch pulley and the pressure plate, and the middle part of the clutch driven plate is keyed to the clutch pulley shaft.

2. The single-cylinder small drag diaphragm spring pressing clutch mechanism according to claim 1, characterized in that: The clutch driven disc also includes a torsional damper, which includes a driven steel plate fixed to the inner side of the friction lining. The driven steel plate is connected to a damper disc and a damper cover by a second rivet. The damper disc is sandwiched between the driven steel plate and the damper cover. The damper disc is provided with a plurality of spring grooves, and damping springs are respectively provided in the spring grooves. The driven steel plate and the damper cover are respectively provided with slots that match the springs, and spring covers are provided on the outside of the slots.

3. The single-cylinder small-diaphragm spring pressing clutch mechanism according to claim 1, characterized in that: The outer periphery of the clutch cover is provided with a transmission plate mounting groove, and the two ends of the transmission plate are respectively connected to the pressure plate and the clutch cover by a third rivet.

4. The single-cylinder small drag diaphragm spring pressing clutch mechanism according to claim 1, characterized in that: The clutch cover is fixedly connected to the clutch pulley by bolts.

5. The single-cylinder small drag diaphragm spring pressing clutch mechanism according to claim 1, characterized in that: The section on the clutch pulley shaft used to mount the clutch pulley, clutch driven disc, and release bearing is thicker than other sections.

6. The single-cylinder small-diaphragm spring pressing clutch mechanism according to claim 1, characterized in that: The clutch pulley shaft is mounted on the gearbox via a positioning bearing on the side near the clutch pulley. A bearing end cover for positioning the positioning bearing is provided on the clutch pulley shaft, and a positioning sleeve is provided on the clutch pulley shaft. The release bearing, clutch release pawl, and bearing end cover are all fitted onto the positioning sleeve.

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