A pressure plate assembly of an automatic adjustment clutch assembly for a vehicle

Abstract

The present invention relates to a pressure plate assembly of an automatic adjustment clutch assembly for a vehicle. The technical scheme is as follows: the pressure plate assembly comprises a pressure plate (1), a cylindrical large tension spring (2), a multi-start transmission thread outer ring (3) and a multi-start transmission thread inner ring (4). The multi-start transmission thread outer ring (3) is fixed on the upper surface of the pressure plate (1), and the multi-start transmission thread inner ring (4) is screwed with the multi-start transmission thread outer ring (3); an arc groove is concentrically provided on the upper surface of the pressure plate (1), and a cylindrical large tension spring (2) is installed in the arc groove, one end of the cylindrical large tension spring (2) is fixed to one end of the arc groove by a screw (11), and the other end of the cylindrical large tension spring (2) is hooked with a spring connection hole (14) at the bottom of the multi-start transmission thread inner ring (4). The present invention is not only convenient to process, easy to industrialize and has low production cost, but also has stable performance and can automatically compensate for the change of the pressing force on the automobile flywheel caused by the wear of the friction plate (24), and the pressing force remains relatively constant.

Description

Technical Field

[0001] The present invention belongs to the technical field of pressure plate components of clutch assembly devices, and specifically relates to a pressure plate component of a vehicle automatic adjustment clutch assembly device. Background Art

[0002] The clutch is an important component of the automobile transmission system that is directly connected to the engine. Its structural characteristics are closely related to the transmission system. At the same time, the clutch has multiple functions such as transmitting and cutting off power, vibration reduction and overload protection, ensuring the smoothness of the car's start and shifting.

[0003] The automobile clutch is a combination of a pressure plate and a friction plate, which are then combined with a flywheel. During the movement of the flywheel and the pressure plate friction plate, the friction plate slides relative to each other, so the surface of the friction plate wears and the thickness of the friction plate decreases. The diaphragm spring pressing force is applied to the pressure plate and the friction plate. As the overall thickness decreases, the pressing force of the diaphragm spring also decreases, which directly affects the operation and running of the automobile. Automobile clutches are mainly divided into friction clutches, electromagnetic clutches, and hydraulic couplings, among which friction clutches are the most widely used. The friction clutch transmits and separates power through the friction between the active part and the driven part, so the friction plate will inevitably wear out during use. If it is not adjusted in time, the actual pressing force will increase, thereby increasing the pedal force and the separation force, which seriously affects its performance and life. Traditional friction clutches all have the above problems.

[0004] The self-adjusting clutch is a new type of clutch structure that can meet the requirements of the stability of the separation force and engagement point during the whole use of the clutch. It changes the structure of the clutch to make the clutch pressure have an automatic compensation function after the pressure plate is worn. It can automatically adjust and compensate for the change of the working pressure caused by the wear of the friction plate during use, so that it remains constant, thereby keeping the clutch torque capacity stable, reducing the separation force and pedal force after the wear of the automobile clutch, and improving the driver's operating stability and comfort. Foreign countries began to develop it in the early 1990s and began to use it in automobiles in 1995. Representative companies include Germany's Luk Company, ZF Sachs Company and France's Valeo Company (Wei Yuanfei, Zhu Qigeng. Introduction of several self-adjusting diaphragm spring clutches. Transmission Technology [J] 2006 (10) 35-37), (Yuan Nianshi. Self-adjusting diaphragm spring clutch. [J] Light Vehicle Technology 2000 (4) 25-30). The self-adjusting clutches produced by the above three companies all have a self-adjusting structure consisting of a wedge-shaped adjustment ring and an adjustment mechanism. The wedge-shaped adjustment ring consists of two upper and lower circular rings with multiple inclined surfaces at one end. The inclined surfaces of the two rings are interlocked with each other. One of the rings is fixed (one of the rings of Luk is directly processed on the clutch cover), and when the other ring rotates in the circumferential direction under the action of the adjustment mechanism, the axial displacement is generated due to the influence of the inclined surfaces on the two rings, thereby compensating for the wear of the friction plate. The adjustment mechanism of Luk and ZF Sachs in Germany is a spring, while the adjustment mechanism of Valeo in France is a worm and gear ring.

[0005] The defects of the above technology are: because the inclined surfaces of the two adjustment rings need to be interlocked with each other, in order to ensure the stability of the self-adjusting structure, the accuracy of the inclined surface slope is very high, so the processing of the wedge-shaped adjustment ring is difficult and the processing cost is high; the fixing ring and the pressure cover are made into a whole, and due to the complex shape of the pressure cover, only casting technology can be used for processing, and the strength and stability of the cast material are lower than those of the rolled material, so it is easy to wear, thereby affecting the life of the clutch.

[0006] The core structures of the invention patents "Self-adjusting push-type clutch" (CN 102128216 A) and "Pressure plate assembly of self-adjusting clutch assembly" (CN 105485201 A) technologies disclosed in 2010 have not yet overcome the above-mentioned technical defects. Summary of the invention

[0007] The present invention aims to overcome the defects of the prior art and aims to provide a pressure plate assembly for an automatic clutch assembly for a vehicle which is easy to manufacture, industrialize and has low production cost; the assembly has stable performance and can automatically compensate for the change in the clamping force on the vehicle flywheel caused by the wear of the friction plate, so that the clamping force of the clutch during use remains relatively constant.

[0008] To achieve the above object, the technical solution adopted by the present invention is:

[0009] The pressure plate assembly comprises a pressure plate, a large cylindrical tension spring, a multi-start transmission thread outer ring, a multi-start transmission thread inner ring, a small cylindrical tension spring, a positioning rectangular strip, a resistance strip and a pressure plate spring.

[0010] The multi-start transmission thread outer ring is a whole composed of a short round tube and a disc at the bottom of the outer wall of the short round tube. The inner wall of the upper part of the multi-start transmission thread outer ring is provided with a multi-start transmission internal thread, and the disc on the outer wall of the bottom of the short tube is provided with a screw hole; a movable groove is provided near the bottom of the multi-start transmission thread outer ring, and a rectangular through hole is provided near the middle of the multi-start transmission thread outer ring.

[0011] The inner ring of the multi-start transmission thread is in the shape of a short circular tube. The lower part of the inner ring of the multi-start transmission thread is provided with a multi-start transmission external thread. The multi-start transmission external thread of the inner ring of the multi-start transmission thread is screwed together with the multi-start transmission internal thread of the outer ring of the multi-start transmission thread. A spring connection hole and a limiting rectangular hole are respectively provided near the bottom of the inner ring of the multi-start transmission thread, and a strip hole is provided near the middle of the inner ring of the multi-start transmission thread.

[0012] The positioning rectangular bar has a rectangular shape, and the rectangular cross section is in an inverted "L" shape; a rectangular mounting hole is provided at the upper portion of the positioning rectangular bar, and an oblong hole is provided at the middle position of the positioning rectangular bar.

[0013] The projection of the pressure plate spring on the horizontal plane is a whole composed of an arc surface and a rectangular surface. A pressure plate screw hole is provided on the inner side near one end of the arc surface, and the other end of the arc surface is in the same plane as the rectangular surface; the outer curvature radius of the arc surface is 0.95 to 0.98 of the curvature radius of the inner circle of the multi-start transmission thread, and the center line of the rectangular plate coincides with the curvature radius of the arc plate; the projection of the pressure plate spring on the vertical plane is a zigzag folded plate.

[0014] The resistance bar is a whole composed of an arc plate, a wedge block and a rectangular block. A rectangular block is arranged on the outer wall of the arc plate at the thin end of the wedge block. The height of the thick end of the wedge block is 1.6 to 1.8 times the height difference between the two planes of the zigzag folded plate.

[0015] The structure of the pressure plate assembly is that the outer ring of the multi-start transmission thread is concentrically fixed to the upper surface of the pressure plate by bolts, and the inner ring of the multi-start transmission thread is screwed with the outer ring of the multi-start transmission thread.

[0016] The positioning rectangular strip is installed on the cylindrical surface of the pressure plate through positioning bolts and the oblong holes of the positioning rectangular strip. The lower end surface of the positioning rectangular strip is flush with the lower plane of the friction plate, and the upper protruding part of the positioning rectangular strip is close to the cylindrical surface of the outer ring of the multi-start transmission thread.

[0017] A pressure plate spring piece is installed on the flat surface of the pressure plate. One end of the pressure plate spring piece is fixed to the pressure plate by a pressure plate screw, and the other end of the pressure plate spring piece passes through the strip hole of the inner ring of the multi-start transmission thread and the rectangular through hole of the outer ring of the multi-start transmission thread and is inserted into the rectangular mounting hole on the upper part of the positioning rectangular bar. The pressure plate spring piece is fastened in the rectangular mounting hole by screws.

[0018] The arc plate in the resistance bar is clamped between the inner ring of the multi-start transmission thread and the pressure plate spring piece, the thick end of the wedge block is pressed under the pressure plate spring piece, and the rectangular block of the wedge block is inserted into the corresponding limiting rectangular hole on the inner ring of the multi-start transmission thread.

[0019] An arc groove is concentrically provided on the pressure plate, and the arc groove is close to the inner wall of the outer ring of the multi-start transmission thread. A large cylindrical tension spring is installed in the arc groove. One end of the large cylindrical tension spring is fixed to one end of the arc groove by a screw, and the other end of the large cylindrical tension spring is hooked with the spring connecting hole at the bottom of the inner ring of the multi-start transmission thread.

[0020] A small cylindrical extension spring is connected between the large cylindrical extension spring and the resistance strip, one end of the small cylindrical extension spring is hooked with the large cylindrical extension spring, and the other end of the small cylindrical extension spring is hooked with a small round hole at the thin end of the wedge block in the resistance strip.

[0021] The central angle of the arc groove is 90-170°.

[0022] When the present invention is in use, the pressure plate of the device is fixedly connected with the pressure cover by bolts, and the diaphragm spring is fixedly connected with the pressure cover. When the upper end face of the inner ring of the multi-start transmission thread is pressed downward by the diaphragm spring, the pressing force is transmitted to the flywheel through the inner ring of the multi-start transmission thread, the outer ring of the multi-start transmission thread, the pressure plate and the friction plate. Under the action of the set pressure, the thickness (height) from the bottom of the friction plate to the upper end face of the inner ring of the multi-start transmission thread is a constant. When the friction plate is worn and thinned, the pressure of the diaphragm spring on the upper end face of the inner ring of the multi-start transmission thread decreases, and the friction force between the upper end face of the inner ring of the multi-start transmission thread and the diaphragm spring decreases. At this time, the cylindrical large tension spring pulls the inner ring of the multi-start transmission thread to rotate along the thread lead angle direction, so that the thickness from the bottom of the friction plate to the upper end face of the inner ring of the multi-start transmission thread is increased to the thickness before the friction plate is worn, ensuring that the pressing force of the diaphragm spring on the upper end face of the inner ring of the multi-start transmission thread remains relatively stable.

[0023] Due to the adoption of the above technical solution, the present invention has the following positive effects compared with the prior art:

[0024] The present invention adopts a multi-start transmission thread pair (a multi-start transmission thread outer ring and a multi-start transmission thread inner ring) to replace the wedge-shaped adjustment ring in the prior art. The stability of the thread transmission is higher than that of the inclined surface buckle, and the thread processing technology is mature and simple. The inner and outer rings are both manufactured by rolling pipes. The mechanical properties are more stable than those of castings, and the processing is convenient, which is easier to industrialize.

[0025] The present invention has a positioning rectangular strip installed on the outer cylindrical surface of the pressure plate by bolts, and the bolt hole of the positioning rectangular strip is processed into an oblong shape, so that the positioning rectangular strip can move up and down along the axial direction of the pressure plate, and the lower bottom surface of the positioning rectangular strip is coplanar with the contact surface between the friction plate and the flywheel. When the thickness of the pressure plate decreases due to wear, the pressure plate moves downward under the pressure of the diaphragm spring. At this time, the inner ring of the multi-start transmission thread overcomes the friction force generated by the diaphragm spring pressing the top of the inner ring of the multi-start transmission thread under the tension of the large cylindrical tension spring, and rotates along the angular direction of the multi-start transmission thread to lift the inner ring of the multi-start transmission thread, thereby keeping the total thickness of the device plus the friction plate unchanged, and the pressing force of the pressure plate on the flywheel reaches a predetermined value. The structure is convenient and reliable.

[0026] In order to control the rotation amount of the inner ring of the multi-start transmission thread, a pressure plate spring piece is installed on the pressure plate, one end of the pressure plate spring piece is fixed to the pressure plate by a pressure plate screw, and the other end of the pressure plate spring piece passes through the strip hole of the inner ring of the multi-start transmission thread and the rectangular through hole of the outer ring of the multi-start transmission thread and is inserted into the rectangular mounting hole on the upper part of the positioning rectangular strip, and the pressure plate spring piece is fastened in the rectangular mounting hole by a screw;

[0027] A resistance bar is pressed between the pressure plate spring sheet and the pressure plate. One end of the resistance bar is pressed under the pressure plate spring sheet, and the rectangular block protruding from the upper part of the other end is inserted into the rectangular hole corresponding to the inner ring of the multi-start transmission thread and can move left and right in the rectangular hole. The lower part is equipped with a small hook, which is hooked with the small cylindrical tension spring. During normal operation, the protruding rectangular block of the resistance bar contacts the right end of the large cylindrical tension spring in the corresponding limiting rectangular hole on the inner ring of the multi-start transmission thread. When the friction plate is worn, the thickness from the friction plate to the top of the inner ring of the multi-start transmission thread becomes smaller. Since the lower end face of the positioning rectangular bar is against the upper end face of the flywheel and cannot move downward, when one end of the pressure plate spring moves downward with the pressure plate, the other end is fixed by the rectangular hole at the top of the positioning rectangular bar and cannot move downward, and a gap is pulled out. The pressure and friction force on the resistance bar are reduced, so it is pulled out by the small cylindrical tension spring and moves to the protruding rectangular block of the resistance bar to contact the other end of the rectangular hole. Then the large cylindrical tension spring pulls the inner ring of the multi-start transmission thread to overcome the friction force generated by the pressing force of the diaphragm spring on the top of the inner ring of the multi-start transmission thread to rotate, so that the protruding rectangular block of the resistance bar contacts with the end of the rectangular hole away from the large cylindrical tension spring again, preventing the over-compensation problem caused by the tension of the large cylindrical tension spring being greater than the friction between the diaphragm spring and the top of the inner ring of the multi-start transmission thread after the friction plate is worn, thereby ensuring the normal operation of the car.

[0028] Therefore, the present invention not only has the characteristics of convenient processing, easy industrialization and low production cost, but also has stable performance and can automatically compensate for the changes in the clamping force on the automobile flywheel caused by the wear of the friction plate, so that the clamping force of the clutch during use can remain relatively constant. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A structural schematic diagram of the present invention;

[0030] Figure 2 for Figure 1 The schematic top view shown;

[0031] Figure 3 for Figure 2 A local enlarged schematic diagram of I;

[0032] Figure 4 for Figure 3 Schematic diagram of the middle DD section;

[0033] Figure 5 for Figure 1 A schematic diagram of the structure of the outer ring 3 of the multi-start transmission thread;

[0034] Figure 6 for Figure 5 Schematic diagram of CC top view;

[0035] Figure 7 for Figure 1 A schematic structural diagram of the multi-start transmission thread inner ring 4;

[0036] Figure 8 for Figure 7 BB top view diagram;

[0037] Fig. 9 for Figure 1 A schematic diagram of the structure of the positioning rectangular strip 6;

[0038] Fig.10 for Fig. 9 Side view of

[0039] Fig.11 for Figure 1 A structural schematic diagram of the pressure plate spring piece 10;

[0040] Fig.12 for Fig.11 A top view schematic diagram of

[0041] Fig.13 for Figure 1 A structural schematic diagram of the resistance bar 8;

[0042] Fig.14 for Fig.13 A top view schematic diagram of

[0043] Fig.15 for Figure 1 Schematic diagram of working status. DETAILED DESCRIPTION

[0044] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but is not intended to limit the scope of protection thereof: Example 1

[0045] A pressure plate assembly of an automatic clutch assembly for a vehicle. Figure 1 and Figure 2 As shown, the pressure plate assembly includes a pressure plate 1, a large cylindrical tension spring 2, a multi-start transmission thread outer ring 3, a multi-start transmission thread inner ring 4, a small cylindrical tension spring 5, a positioning rectangular bar 6, a resistance bar 8 and a pressure plate spring 10.

[0046] like Figure 1 , 2 , 5 and Figure 6 As shown, the multi-start transmission thread outer ring 3 is a whole composed of a short round tube and a disc at the bottom of the outer wall of the short round tube. The inner wall of the upper part of the multi-start transmission thread outer ring 3 is provided with a multi-start transmission internal thread, and the disc on the outer wall of the bottom of the short tube is provided with a screw hole; a movable groove 12 is provided near the bottom of the multi-start transmission thread outer ring 3, and a rectangular through hole 13 is provided near the middle of the multi-start transmission thread outer ring 3.

[0047] like Figure 1 , 2 , 7 and Figure 8 As shown, the multi-start transmission thread inner ring 4 is in the shape of a short circular tube, and a multi-start transmission external thread is provided at the lower part of the multi-start transmission thread inner ring 4. The multi-start transmission external thread of the multi-start transmission thread inner ring 4 is screwed together with the multi-start transmission internal thread of the multi-start transmission thread outer ring 3; a spring connecting hole 14 and a limiting rectangular hole 15 are respectively provided near the bottom of the multi-start transmission thread inner ring 4, and a strip hole 16 is provided near the middle of the multi-start transmission thread inner ring 4.

[0048] like Figure 1 , 2 , 3, 4, 9 and Fig.10 As shown, the positioning rectangular bar 6 has a rectangular shape, and the rectangular cross section is an inverted "L" shape; a rectangular mounting hole 17 is provided at the upper portion of the positioning rectangular bar 6, and an oblong hole 18 is provided at the middle position of the positioning rectangular bar 6.

[0049] like Figure 1 , 2 , 3, 4, 11 and Fig.12 As shown, the projection of the pressure plate spring piece 10 on the horizontal plane is a whole composed of an arc surface and a rectangular surface, and a pressure plate screw hole 19 is provided on the inner side near one end of the arc surface, and the other end of the arc surface is in the same plane as the rectangular surface; the outer curvature radius of the arc surface is 0.95 to 0.98 of the curvature radius of the inner ring 4 of the multi-start transmission thread, and the center line of the rectangular plate shown coincides with the curvature radius of the arc plate 21; the projection of the pressure plate spring piece 10 on the vertical plane is a zigzag folded plate.

[0050] like Figure 1 ,2 , 13 and Fig.14 As shown, the resistance bar 8 is a whole composed of an arc plate 21, a wedge block 22 and a rectangular block 20. A rectangular block 20 is provided on the outer wall of the arc plate 21 at the thin end of the wedge block 22. The height of the thick end of the wedge block 22 is 1.8 times the height difference between the two planes of the zigzag folded plate.

[0051] like Figure 1 to Figure 4 As shown, the structure of the pressure plate assembly is: the multi-start transmission thread outer ring 3 is concentrically fixed to the upper surface of the pressure plate 1 by bolts, and the multi-start transmission thread inner ring 4 is screwed with the multi-start transmission thread outer ring 3.

[0052] like Figure 1 to Figure 4 As shown, the positioning rectangular bar 6 is installed on the cylindrical surface of the pressure plate 1 through the positioning bolts 7 and the oblong holes 18 of the positioning rectangular bar 6. The lower end surface of the positioning rectangular bar 6 is flush with the lower plane of the friction plate 24, and the upper protruding part of the positioning rectangular bar 6 is close to the cylindrical surface of the multi-start transmission thread outer ring 3.

[0053] like Figure 1 to Figure 4 As shown, a pressure plate spring piece 10 is installed on the plane of the pressure plate 1, one end of the pressure plate spring piece 10 is fixed to the pressure plate 1 by a pressure plate screw 9, and the other end of the pressure plate spring piece 10 passes through the strip hole 16 of the multi-start transmission thread inner ring 4 and the rectangular through hole 13 of the multi-start transmission thread outer ring 3 and is inserted into the rectangular mounting hole 17 on the upper part of the positioning rectangular bar 6, and the pressure plate spring piece 10 is fastened in the rectangular mounting hole 17 by screws.

[0054] like Figure 1 to Figure 4 As shown, the arc plate 21 in the resistance bar 8 is clamped between the inner ring 4 of the multi-start transmission thread and the pressure plate spring piece 10, the thick end of the wedge block 22 is pressed under the pressure plate spring piece 10, and the rectangular block 20 of the wedge block 22 is inserted into the corresponding limiting rectangular hole 15 on the inner ring 4 of the multi-start transmission thread.

[0055] like Figure 2 As shown, the pressure plate 1 is concentrically provided with an arc groove, which is close to the inner wall of the multi-start transmission thread outer ring 3. A large cylindrical tension spring 2 is installed in the arc groove, and one end of the large cylindrical tension spring 2 is fixed to one end of the arc groove by a screw 11, and the other end of the large cylindrical tension spring 2 is hooked with a spring connecting hole 14 at the bottom of the multi-start transmission thread inner ring 4.

[0056] like Figure 1-2 As shown, a small cylindrical tension spring 5 is connected between the large cylindrical tension spring 2 and the resistance bar 8, one end of the small cylindrical tension spring 5 is hooked with the large cylindrical tension spring 2, and the other end of the small cylindrical tension spring 5 is hooked with the small circular hole 23 at the thin end of the wedge block 22 in the resistance bar 8.

[0057] The central angle of the arc groove is 170°.

[0058] like Fig.15 As shown, when the specific embodiment is used, the pressure plate 1 of the device is fixedly connected with the pressure cover 25 by bolts, and the diaphragm spring 26 is fixedly connected with the pressure cover 25. When the upper end surface of the multi-start transmission thread inner ring 4 is pressed downward by the diaphragm spring 26, the pressing force is transmitted to the flywheel through the multi-start transmission thread inner ring 4, the multi-start transmission thread outer ring 3, the pressure plate 1 and the friction plate 24. Under the action of the set pressure, the thickness height from the bottom of the friction plate 24 to the upper end face of the multi-start transmission thread inner ring 4 is a constant. When the friction plate 24 wears and becomes thinner, the pressure of the diaphragm spring 26 on the upper end face of the multi-start transmission thread inner ring 4 decreases, and the friction force between the upper end face of the multi-start transmission thread inner ring 4 and the diaphragm spring 26 decreases. At this time, the large cylindrical tension spring 2 pulls the multi-start transmission thread inner ring 4 to rotate along the thread lead angle direction, so that the thickness from the bottom of the friction plate 24 to the upper end face of the multi-start transmission thread inner ring 4 is increased to the thickness before the friction plate 24 is worn, ensuring that the clamping force of the diaphragm spring 26 on the upper end face of the multi-start transmission thread inner ring 4 remains relatively stable.

[0059] Example 2

[0060] A pressure plate assembly of an automatic clutch assembly for a vehicle. Except for the following technical parameters, the rest is the same as in Example 1:

[0061] The height of the thickness end of the wedge block 22 is 1.6 times the height difference between the two planes of the zigzag folded plate.

[0062] The central angle of the arc groove is 120°.

[0063] Compared with the prior art, this specific implementation has the following positive effects:

[0064] This specific implementation adopts a multi-start transmission thread with a multi-start transmission thread outer ring 3 and a multi-start transmission thread inner ring 4 to replace the wedge-shaped adjustment ring in the prior art. The stability of the thread transmission is higher than that of the bevel buckle, and the thread processing technology is mature and simple. The inner and outer rings are both manufactured by rolled tubes, and the mechanical properties are more stable than those of castings. The processing is convenient and easier to industrialize.

[0065] In this specific embodiment, a positioning rectangular strip 6 is installed on the outer cylindrical surface of the pressure plate 1 by bolts, and the bolt holes of the positioning rectangular strip 6 are processed into an oblong shape, so that the positioning rectangular strip 6 can move up and down along the axial direction of the pressure plate 1, and the lower bottom surface of the positioning rectangular strip 6 and the contact surface of the friction plate 24 and the flywheel are coplanar. When the thickness of the pressure plate 1 decreases due to wear, the pressure plate 1 moves downward under the pressure of the diaphragm spring 26. At this time, the multi-start transmission thread inner ring 4 overcomes the friction force generated by the diaphragm spring 26 pressing the top of the multi-start transmission thread inner ring 4 under the tension of the cylindrical large tension spring 2, and rotates along the multi-start transmission thread angle direction, lifting the multi-start transmission thread inner ring 4, thereby keeping the total thickness of the device plus the friction plate 24 unchanged, and the pressing force of the pressure plate 1 on the flywheel reaches a predetermined value. The structure is convenient and reliable.

[0066] In order to control the rotation amount of the multi-thread inner ring 4, one end of the pressure plate spring piece 10 is fixed on the pressure plate 1 by the pressure plate screw 9, and the other end of the pressure plate spring piece 10 passes through the strip hole 16 of the multi-thread inner ring 4 and the rectangular through hole 13 of the multi-thread outer ring 3 and is inserted into the rectangular mounting hole 17 on the upper part of the positioning rectangular strip 6, and the pressure plate spring piece 10 is fastened in the rectangular mounting hole 17 by screws. A resistance strip 8 is pressed between the bottom of the pressure plate spring piece 10 and the pressure plate 1, and one end of the resistance strip 8 is pressed under the pressure plate spring piece 10, and the rectangular block 20 protruding from the upper part of the other end is inserted into the rectangular hole corresponding to the multi-thread inner ring 4 and can move left and right in the rectangular hole, and a small hook is provided at the bottom to hook with the small cylindrical tension spring. During normal operation, the protruding rectangular block 20 of the resistance bar 8 contacts the end of the large cylindrical tension spring 2 in the corresponding limiting rectangular hole on the multi-start transmission thread inner ring 4. When the friction plate 24 is worn, the thickness from the friction plate 24 to the top of the multi-start transmission thread inner ring 4 becomes smaller. Since the lower end face of the positioning rectangular bar 6 is against the upper end face of the flywheel and cannot move downward, when one end of the pressure plate spring 10 moves downward with the pressure plate 1, the other end is fixed by the rectangular hole at the top of the positioning rectangular bar 6 and cannot move downward, and a gap is pulled out. The pressure and friction force on the resistance bar 8 are reduced, and it is pulled out by the small cylindrical tension spring 5 and moves to the protruding rectangular block 20 of the resistance bar 8 to contact the other end of the rectangular hole. Then the large cylindrical tension spring 2 pulls the multi-start transmission thread inner ring 4 to overcome the friction force generated by the pressing force of the diaphragm spring 26 on the top of the multi-start transmission thread inner ring 4 to rotate, so that the protruding rectangular block 20 of the resistance bar 8 contacts the end of the rectangular hole away from the large cylindrical tension spring 2 again, preventing the over-compensation problem caused by the tension of the large cylindrical tension spring 2 being greater than the friction between the diaphragm spring 26 and the top of the multi-start transmission thread inner ring 4 after the friction plate 24 is worn, thereby ensuring the normal operation of the car.

[0067] Therefore, this specific implementation not only has the characteristics of easy processing, easy industrialization and low production cost, but also has stable performance and can automatically compensate for the changes in the clamping force on the automobile flywheel caused by the wear of the friction plate, so that the clamping force of the clutch during use remains relatively constant.

Claims

1. A pressure plate assembly of an automatic clutch assembly for a vehicle, characterized in that: The pressure plate assembly comprises a pressure plate (1), a large cylindrical tension spring (2), a multi-start transmission thread outer ring (3), a multi-start transmission thread inner ring (4), a small cylindrical tension spring (5), a positioning rectangular strip (6), a resistance strip (8) and a pressure plate spring sheet (10); The multi-start transmission thread outer ring (3) is a whole composed of a short round tube and a disc at the bottom of the outer wall of the short round tube. The inner wall of the upper part of the multi-start transmission thread outer ring (3) is provided with a multi-start transmission internal thread, and the disc at the bottom of the outer wall of the short round tube is provided with a screw hole; a moving groove (12) is provided near the bottom of the multi-start transmission thread outer ring (3), and a rectangular through hole (13) is provided near the middle of the multi-start transmission thread outer ring (3); The multi-threaded inner ring (4) is in the shape of a short circular tube. The lower part of the multi-threaded inner ring (4) is provided with a multi-threaded outer thread. The multi-threaded outer thread of the multi-threaded inner ring (4) is screwed with the multi-threaded inner thread of the multi-threaded outer ring (3). A spring connection hole (14) and a limiting rectangular hole (15) are respectively provided near the bottom of the multi-threaded inner ring (4), and a strip hole (16) is provided near the middle of the multi-threaded inner ring (4). The positioning rectangular strip (6) has a rectangular shape, and the rectangular cross section is in an inverted "L" shape; a rectangular mounting hole (17) is provided at the upper portion of the positioning rectangular strip (6), and an oblong hole (18) is provided at the middle position of the positioning rectangular strip (6); The projection of the pressure plate spring piece (10) on the horizontal plane is a whole composed of an arc surface and a rectangular surface. A pressure plate screw hole (19) is provided on the inner side near one end of the arc surface. The other end of the arc surface is in the same plane as the rectangular surface. The outer curvature radius of the arc surface is 0.95 to 0.98 of the curvature radius of the inner ring of the multi-start transmission thread (4). The center line of the rectangular plate coincides with the curvature radius of the arc plate (21). The projection of the pressure plate spring piece (10) on the vertical plane is a zigzag folded plate. The resistance bar (8) is a whole composed of an arc plate (21), a wedge block (22) and a rectangular block (20); the rectangular block (20) is provided on the outer wall of the arc plate (21) at the thin end of the wedge block (22); the height of the thick end of the wedge block (22) is 1.6 to 1.8 times the height difference between the two planes of the zigzag folded plate; The structure of the pressure plate assembly is as follows: the multi-start transmission thread outer ring (3) is concentrically fixed to the upper surface of the pressure plate (1) by bolts, and the multi-start transmission thread inner ring (4) is screwed with the multi-start transmission thread outer ring (3); The positioning rectangular strip (6) is installed on the cylindrical surface of the pressure plate (1) through the positioning bolt (7) and the oblong hole (18) of the positioning rectangular strip (6), the lower end surface of the positioning rectangular strip (6) is flush with the lower plane of the friction plate (24), and the upper protruding portion of the positioning rectangular strip (6) is close to the cylindrical surface of the multi-start transmission thread outer ring (3); A pressure plate spring sheet (10) is installed on the upper plane of the pressure plate (1), one end of the pressure plate spring sheet (10) is fixed on the pressure plate (1) by a pressure plate screw (9), and the other end of the pressure plate spring sheet (10) passes through the strip hole (16) of the multi-start transmission thread inner ring (4) and the rectangular through hole (13) of the multi-start transmission thread outer ring (3) and is inserted into the rectangular mounting hole (17) on the upper part of the positioning rectangular strip (6), and the pressure plate spring sheet (10) is fastened in the rectangular mounting hole (17) by a screw; The arc plate (21) in the resistance bar (8) is clamped between the inner ring of the multi-start transmission thread (4) and the pressure plate spring sheet (10), the thick end of the wedge block (22) is pressed under the pressure plate spring sheet (10), and the rectangular block (20) of the wedge block (22) is inserted into the corresponding limiting rectangular hole (15) on the inner ring of the multi-start transmission thread (4); The pressure plate (1) is provided with an arc groove co-centrically, the arc groove is close to the inner wall of the multi-start transmission thread outer ring (3), a cylindrical large tension spring (2) is installed in the arc groove, one end of the cylindrical large tension spring (2) is fixed to one end of the arc groove by a screw (11), and the other end of the cylindrical large tension spring (2) is hooked with a spring connection hole (14) at the bottom of the multi-start transmission thread inner ring (4); A small cylindrical stretch spring (5) is connected between the large cylindrical stretch spring (2) and the resistance bar (8), one end of the small cylindrical stretch spring (5) is hooked with the large cylindrical stretch spring (2), and the other end of the small cylindrical stretch spring (5) is hooked with a small circular hole (23) at the thin end of a wedge block (22) in the resistance bar (8).

2. The pressure plate assembly of the vehicle automatic adjustment clutch assembly according to claim 1 is characterized in that The central angle of the arc groove is 90-170°.

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