Torsion-limiting shock absorber

Abstract

The utility model discloses a torsion-limiting shock absorber, which relates to the field of automobile transmission systems and comprises a flywheel assembly, a driven disc assembly, a bearing disc, a belleville spring and a cover, the driven disc assembly, the bearing disc, the belleville spring and the cover are sequentially placed on the flywheel assembly, the cover and the flywheel assembly are locked and fixed through bolts, and the belleville spring is tightly pressed on the bearing disc. The bearing disc is used for pressing the driven disc assembly on the flywheel assembly; the driven disc assembly has two-stage pre-vibration reduction and one-stage main vibration reduction, the rotation angle range of the first-stage pre-vibration reduction is smaller than 7 degrees, the rotation angle range of the second-stage pre-vibration reduction is 7-12 degrees, and the rotation angle range of the main vibration reduction is 12-30 degrees; a plurality of supporting blocks are evenly distributed along the outer edge of the outer disc hub, and the rotating angle of the supporting blocks relative to the outer disc hub ranges from 0 degree to 18 degrees. The damping device has the advantages of being compact in structure, reasonable in layout and convenient to assemble, and can meet the damping performance requirements of the hybrid electric vehicle in different working modes such as idling parking, flat road or slope starting, rapid acceleration or rapid deceleration and the like.

Description

Technical Field

[0001] The utility model relates to the field of automobile transmission systems, in particular to a torque limiting vibration damper. Background Art

[0002] In the transmission system of hybrid vehicles, a torsional vibration damper is installed on the flywheel, which can reduce the torsional stiffness of the joint between the engine output shaft and the generator input shaft, increase torsional damping, and effectively filter the output torque fluctuation of the engine, thereby eliminating the torsional vibration and noise generated during transmission, providing a good torque input environment for the generator. The overall structure is simple and reasonable, the transmission is stable, and deformation of the drive shaft due to excessive torsional stiffness can be avoided, thereby increasing service life and reducing maintenance costs.

[0003] Existing torsional vibration dampers usually only have one or two levels of vibration reduction, which is difficult to adapt to various working conditions of the vehicle during driving. When the engine impact torque is large, the torsional vibration damper does not have the function of torque limiting protection, which can easily cause the transmission system to overload and the components in the transmission system to be easily damaged. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a torque limiting vibration damper with the advantages of compact structure, reasonable layout and convenient assembly, which can meet the vibration reduction performance requirements of hybrid vehicles in different working modes such as idling parking, starting on a flat road or a slope, and rapid acceleration or rapid deceleration.

[0005] The purpose of the utility model is to achieve the following technical solutions: the torque limiting vibration damper comprises a flywheel assembly and a driven disc assembly, a bearing disc, a disc spring and a cover which are sequentially placed on the flywheel assembly, the cover and the flywheel assembly are fixed by bolts, so that the disc spring is pressed against the bearing disc, and the bearing disc presses the driven disc assembly against the flywheel assembly; the driven disc assembly comprises an inner disc hub, an outer disc hub which is sleeved on the outer periphery of the inner disc hub and rotates relatively, and a pre-vibration damping component positioned on the outer disc hub, the inner disc hub passes through the outer disc hub and The pre-vibration damping assembly comprises a driven disc arranged on a side of the outer disc hub close to the flywheel assembly, and a vibration damping disc is arranged on a side of the outer disc hub close to the cover; the driven disc assembly has two-stage pre-vibration damping and one-stage main vibration damping, wherein the rotation angle range of the first stage pre-vibration damping is less than 7°, the rotation angle range of the second stage pre-vibration damping is 7° to 12°, and the rotation angle range of the main vibration damping is 12° to 30°; a plurality of support blocks are evenly distributed along the outer edge of the outer disc hub for riveting the driven disc and the vibration damping disc, and the rotation angle range of the support blocks relative to the outer disc hub is 0 to 18°.

[0006] As a further technical solution, the pre-vibration reduction assembly includes a positioning ring II, a positioning ring V is arranged on one side of the positioning ring II, and a positioning ring VI is arranged on the other side. A number of springs II for matching the positioning ring V and a number of springs III for matching the positioning ring VI are staggered along the circumferential direction of the positioning ring II. The positioning ring V is matched with the inner hub spline through the special-shaped hole arranged in the center, and there is no matching gap. The positioning ring VI is matched with the inner hub through the special-shaped hole arranged in the center, leaving a gap L1. The positioning ring VI is matched with the outer hub through the special-shaped hole arranged in the center, leaving a gap L2. When the inner hub drives the positioning ring V to rotate, the spring II is first compressed to form a first-level pre-vibration reduction. When the inner hub drives the positioning ring V to rotate relative to a distance exceeding the gap L1, the positioning ring VI starts to rotate, so that both the spring II and the spring III are compressed to form a second-level pre-vibration reduction.

[0007] As a further technical solution, the positioning ring II is provided with a first slot for inserting spring II and a second slot for inserting spring III, and both ends of the first slot and the second slot are extended to form a slide groove. The positioning ring V is provided with a first positioning claw at a position corresponding to the first slot, which is used to be inserted into the slide grooves at both ends of the first slot, so that the two ends of spring II respectively rest on a first positioning claw. The positioning ring VI is provided with a second positioning claw at a position corresponding to the second slot, which is used to be inserted into the slide grooves at both ends of the second slot, so that the two ends of spring III respectively rest on a second positioning claw.

[0008] As a further technical solution, a boss is provided on the side of the positioning ring II close to the outer hub for fittingly inserting into a slot provided on the outer hub.

[0009] As a further technical solution, a limiting groove is provided on the outer circumference of the outer hub at a position corresponding to each supporting block, so that the supporting block can rotate relative to the outer hub in the limiting groove.

[0010] As a further technical solution, windows are provided at corresponding positions of the driven plate, the outer hub and the damping plate for inserting spring I so that spring I is evenly distributed along the circumferential direction of the driven plate assembly. When the inner hub drives the positioning ring VI to rotate relative to a distance exceeding the gap L2, the outer hub starts to rotate, compressing the spring I to form a primary main damping.

[0011] As a further technical solution, the carrier plate presses the driven plate assembly through the clamping force applied by the disc spring. When the engine impact torque exceeds the clamping force applied by the disc spring on the carrier plate, that is, exceeds the rotation angle range of the first-level main shock absorber, the driven plate assembly slides relative to the flywheel assembly, thereby limiting the transmission of overload torque.

[0012] As a further technical solution, the driven disk and the inner disk hub are positioned by a positioning ring III, a washer I is sleeved on the outer circumference of the positioning ring III, and a disc spring II is arranged between the washer I and the positioning ring VI; a positioning ring I is sleeved on the inner disk hub, a positioning ring IV is sleeved on the positioning ring I, and the disc spring I presses the positioning ring IV onto the positioning ring I, so that the positioning ring I is pressed against the outer disk hub, and a washer II is also sleeved on the inner disk hub, and the disc spring III is pressed between the washer II and the vibration damping disk.

[0013] As a further technical solution, two friction plates are arranged on the outer periphery of the driven plate, a number of spring plates are fixed between the two friction plates by friction plate rivets, and the other end of each spring plate is fixed to the driven plate by the spring plate rivet; the bearing plate is pressed on one of the friction plates, so that the other friction plate is pressed tightly on the flywheel assembly.

[0014] As a further technical solution, the carrier plate is bent toward the side away from the flywheel assembly to form a plurality of bent claws, and square holes are opened on the cover at positions corresponding to the bent claws, and the bent claws are inserted into the corresponding square holes to achieve positioning.

[0015] The beneficial effects of the utility model are:

[0016] 1. The three-stage vibration reduction structure is adopted, including two-stage pre-vibration reduction and one-stage main vibration reduction, which can meet the vibration reduction performance requirements of hybrid vehicles in different working modes such as idling parking, starting on flat roads or slopes, rapid acceleration or rapid deceleration, and has better applicability;

[0017] 2. The support block structure is used for connection. The support block is arranged on the outer edge of the driven disc, which increases the torsion angle and improves the vibration reduction effect;

[0018] 3. The disc spring is used to compress the bearing plate, and the bearing plate compresses the driven plate assembly. When the impact torque of the engine exceeds the set limit, the sliding friction of the driven plate assembly is used to limit the transmission of the overload torque, prevent the transmission system from overloading, and protect the components in the transmission system from damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the main structure of the utility model.

[0020] Figure 2 It is a schematic diagram of the assembly structure of the utility model.

[0021] Figure 3 It is a cross-sectional structural schematic diagram of the utility model.

[0022] Figure 4 It is a schematic cross-sectional structural diagram of the driven disc assembly in the utility model.

[0023] Figure 5 for Figure 4 A partial enlarged schematic diagram of area A in the middle.

[0024] Figure 6 It is a schematic diagram of the structure of the pre-vibration damping component in the utility model (hidden spring II and spring III).

[0025] Figure 7 It is a structural schematic diagram of the pre-vibration reduction component in the utility model.

[0026] Figure 8 for Figure 7 PP cross-sectional view.

[0027] Fig. 9 It is a schematic structural diagram of the cooperation between the pre-vibration damping component and the inner and outer disc hubs in the utility model.

[0028] Fig.10 It is a schematic diagram of the structure of the cooperation between the support block and the outer disc hub in the utility model.

[0029] Fig.11 It is a structural schematic diagram of the carrying plate in the utility model.

[0030] Fig.12 It is a structural schematic diagram of the middle cover of the utility model.

[0031] Fig.13 This is a performance curve diagram of the torque limiting vibration damper provided by the utility model.

[0032] Description of the accompanying drawings: flywheel assembly 1, driven plate assembly 2, bearing plate 3, bent claw 31, disc spring 4, cover 5, square hole 51, bolt 6, friction plate 201, spring plate 202, friction plate rivet 203, spring plate rivet 204, driven plate 205, support block 206, positioning ring III 207, washer I 208, disc spring II 209, positioning ring VI 210, positioning ring II 211, spring II 212, spring III 213, positioning ring V214, inner disk hub 215, outer disk hub 216, spring I217, positioning ring I218, positioning ring IV219, disc spring I220, washer II221, disc spring III222, vibration damping plate 223, first slot 224, second slot 225, first positioning claw 226, second positioning claw 227, boss 228, slot 229, slide groove 230, limit groove 231, window 232. DETAILED DESCRIPTION

[0033] The utility model will be described in detail below with reference to the accompanying drawings:

[0034] Example: As shown in the attached Figures 1 to 13As shown, the torque limiting vibration damper includes a flywheel assembly 1, a driven plate assembly 2, a bearing plate 3, a bent claw 31, a disc spring 4, a cover 5, a square hole 51, a bolt 6, a friction plate 201, a spring plate 202, a friction plate rivet 203, a spring plate rivet 204, a driven plate 205, a support block 206, a positioning ring III 207, a washer I 208, a disc spring II 209, a positioning ring VI 210, a positioning ring II 211, a spring II 212, Spring III 213, positioning ring V 214, inner disk hub 215, outer disk hub 216, spring I 217, positioning ring I 218, positioning ring IV 219, disc spring I 220, washer II 221, disc spring III 222, damping plate 223, first slot 224, second slot 225, first positioning claw 226, second positioning claw 227, boss 228, slot 229, slide groove 230, limit groove 231 and window 232.

[0035] Reference Figure 2 , 3 , the driven disc assembly 2, the bearing disc 3, the disc spring 4 and the cover 5 are placed on the flywheel assembly 1 in sequence, and the cover 5 is fastened to the flywheel assembly 1 by bolts 6, so that the disc spring 4 is pressed against the bearing disc 3, and the bearing disc 3 presses the driven disc assembly 2 against the flywheel assembly 1. Fig.11 , 12 As shown, the carrier plate 3 is bent toward the side away from the flywheel assembly 1 to form six bent claws 31, and the cover 5 is provided with square holes 51 (six in total) at positions corresponding to the bent claws 31, and the bent claws 31 are inserted into the square holes 51 one by one to achieve positioning, as shown in FIG. Figure 1 In normal operation, the bearing plate 3 presses the driven plate assembly 2 through the pressing force applied by the disc spring 4. When the engine impact torque exceeds the pressing force applied by the disc spring 4 to the bearing plate 3, that is, exceeds the rotation angle range of the main vibration reduction, the driven plate assembly 2 slides relative to the flywheel assembly 1, thereby limiting the transmission of overload torque.

[0036] like Figure 4 , 5 As shown, the driven disc assembly 2 includes an inner disc hub 215, an outer disc hub 216 sleeved on the outer periphery of the inner disc hub 215 and relatively rotating, and a pre-vibration damping assembly positioned on the outer disc hub 216. The inner disc hub 215 penetrates the outer disc hub 216 and the pre-vibration damping assembly. The driven disc 205 is arranged on the side of the outer disc hub 216 close to the flywheel assembly 1, and the side of the outer disc hub 216 close to the cover 5 is provided with a vibration damping disc 223. Fig.13 In the figure, θ1 is 7°, θ2 is 12°, and θ3 is 30°. The driven disc assembly 2 has two levels of pre-vibration reduction and one level of main vibration reduction. The rotation angle range of the first level of pre-vibration reduction is less than 7°, the rotation angle range of the second level of pre-vibration reduction is 7° to 12°, and the rotation angle range of the main vibration reduction is 12° to 30°.

[0037] Reference Figures 6 to 9 The pre-vibration damping assembly includes a positioning ring II 211, a positioning ring V 214 is arranged on one side of the positioning ring II 211, and a positioning ring VI 210 is arranged on the other side. Two springs II 212 and two springs III 213 are staggeredly distributed along the circumferential direction of the positioning ring II 211. Further, two first clamping grooves 224 for inserting the spring II 212 and two second clamping grooves 225 for inserting the spring III 213 are provided on the positioning ring II 211, and both ends of the first clamping groove 224 and the second clamping groove 225 are extended to form a slide groove 230. A first positioning claw 226 is provided at a position corresponding to the first clamping groove 224 on the positioning ring V 214, and the first positioning claw 226 is inserted into the slide grooves 230 at both ends of the first clamping groove 224, so that the two ends of the spring II 212 are respectively against one of the first positioning claws 226. A second positioning claw 227 is provided on the positioning ring VI 210 at a position corresponding to the second slot 225. The second positioning claw 227 is inserted into the slide grooves 230 at both ends of the second slot 225, so that both ends of the spring III 213 are respectively against one second positioning claw 227. Figure 6 , 7 See attached Fig. 9 , the positioning ring V214 is splined with the inner hub 215 through the special-shaped hole set in the center, and there is no clearance. The positioning ring VI210 is splined with the inner hub 215 through the special-shaped hole set in the center, leaving a gap L1. The positioning ring VI210 is splined with the outer hub 216 through the special-shaped hole set in the center, leaving a gap L2. When the inner hub 215 drives the positioning ring V214 to rotate, the spring II212 is first compressed to form a first-level pre-vibration reduction. When the inner hub 215 drives the positioning ring V214 to rotate relative to the distance exceeding the gap L1, the positioning ring VI210 starts to rotate, so that both the spring II212 and the spring III213 are compressed to form a second-level pre-vibration reduction. Windows 232 are provided at corresponding positions of the driven plate 205, the outer hub 216 and the damping plate 223 for inserting springs I 217 so that springs I 217 (four in total) are evenly distributed along the circumferential direction of the driven plate assembly 2. When the inner hub 215 drives the positioning ring VI 210 to rotate relative to a distance exceeding the gap L2, the outer hub 216 starts to rotate, compressing the springs I 217 to form a primary main damping.

[0038] Preferably, a boss 228 is provided on one side of the positioning ring II 211 close to the outer hub 216, which can be inserted into a slot 229 provided on the outer hub 216. Figure 5 , 10As shown. Further, four support blocks 206 are evenly distributed along the outer edge of the outer hub 216, which are used to rivet the driven disk 205 and the damping disk 223, and the rotation angle range of the support blocks 206 relative to the outer hub 216 is 0-18 degrees. A limiting groove 231 is provided at a position corresponding to each support block 206 on the outer circumference of the outer hub 216, so that the support block 206 can rotate relative to the outer hub 216 in the limiting groove 231.

[0039] Preferably, if Figure 4 , 5 As shown, the driven disk 205 and the inner disk hub 215 are positioned by a positioning ring III 207, a washer I 208 is sleeved on the outer periphery of the positioning ring III 207, and a disc spring II 209 is arranged between the washer I 208 and the positioning ring VI 210. A positioning ring I 218 is sleeved on the inner disk hub 215, a positioning ring IV 219 is sleeved on the positioning ring I 218, and the disc spring I 220 presses the positioning ring IV 219 on the positioning ring I 218, so that the positioning ring I 218 is pressed against the outer disk hub 216, and a washer II 221 is also sleeved on the inner disk hub 215, and the disc spring III 222 is pressed between the washer II 221 and the damping disk 223. The positioning ring IV 219, the disc spring I 220, and the disc spring III 222 are all matched with the damping disk 223 by a slot type.

[0040] Furthermore, two friction plates 201 are arranged on the periphery of the driven plate 205, and a plurality of spring plates 202 are fixed between the two friction plates 201 by friction plate rivets 203, and the other end of each spring plate 202 is fixed to the driven plate 205 by a spring plate rivet 204; the supporting plate 3 is pressed on one of the friction plates 201, so that the other friction plate 201 is pressed tightly on the flywheel assembly 1.

[0041] The working process of this utility model:

[0042] When assembling the torque limiting damper assembly, place the driven plate assembly 2 on the flywheel assembly 1, place the supporting plate 3 on the driven plate assembly 2, place the disc spring 4 on the supporting plate 3, and finally place the cover 5. The six bent claws 31 of the supporting plate 3 pass through the six square holes 51 of the cover 5, and tighten the cover 5 and the flywheel assembly 1 with bolts 6.

[0043] When assembling the driven plate assembly 2, the spring sheet 202, the driven plate 205 and the friction plate 201 are riveted together by the spring sheet rivet 204 and the friction plate rivet 203 to form an assembly A. The positioning ring II 211, the spring II 212, the spring III 213, the positioning ring V 214 and the positioning ring VI 210 form a pre-vibration damping assembly. Place the positioning ring III 207 on the component A, insert the washer I 208 into the positioning ring III 207, and place the disc spring II 209 on the washer I 208; place the pre-vibration damping assembly on the disc spring II 209; place the inner hub 215 into the pre-vibration damping assembly; insert the outer hub 216 into the inner hub 215; insert the four springs I 217 into the four windows 232 of the outer hub 216; place the positioning ring I 218, the positioning ring IV 219, and the disc spring I 220 on the outer hub 216; place the washer II 221 and the disc spring III 222 on the inner hub 215; place the support block 206 in the four small square holes of the driven disk 205, place the vibration damping disk 223 on it, and rivet them into the driven disk assembly 2.

[0044] Working principle: The pre-vibration reduction assembly adopts two-stage vibration reduction, one group of springs II 212 corresponds to the positioning ring V 214, and the other group of springs III 213 corresponds to the positioning ring VI 210; the middle special-shaped hole of the positioning ring V 214 and the outer tooth profile of the inner disk hub 215 are matched without gap; the middle special-shaped hole of the positioning ring VI 210 and the outer tooth profile of the inner disk hub 215 are matched with a gap L1; the middle special-shaped hole of the positioning ring VI 210 and the middle special-shaped hole of the outer disk hub 216 are matched with a gap L2. Relatively speaking, when the inner disk hub 215 drives the positioning ring V 214 to rotate by a length of L1, the spring II 212 is compressed, forming a first-stage pre-vibration reduction. When the inner disk hub 215 continues to rotate by a length of L2, at this time, both the positioning ring V 214 and the positioning ring VI 210 are driven, and the spring II 212 and the spring III 213 are compressed, forming a second-stage pre-vibration reduction.

[0045] In the first stage of pre-vibration reduction, spring II 212 works within a rotation angle range of less than 7°. The stiffness of spring II 212 is relatively small, and the friction damping torque is relatively small, so it is suitable for vibration isolation under the idling condition of the automobile.

[0046] In the second stage of pre-vibration reduction, spring II 212 and spring III 213 work within the range of 7° to 12°. The stiffness and friction damping torque of spring III 213 are slightly increased, which is suitable for vibration isolation in the initial stage of automobile driving and starting and stopping. The performance curve of the torque limiting damper is as follows: Fig.13 shown.

[0047] The main vibration reduction adopts a first-stage large-angle vibration reduction, and adopts a support block 206 structure connection. The support block 206 is arranged on the outer edge of the vibration reduction plate 223, which can increase the torsion angle and improve the vibration reduction effect. The spring I 217 works within the range of 12° to 30°, and the support block 206 can work at an angle of up to 18°. Fig.10The stiffness and friction damping torque of spring Ⅰ217 are greatly improved, which is suitable for large torque output conditions such as normal driving, acceleration and climbing of the car.

[0048] The force applied by the disc spring 4 to the support plate 3 acts on the driven plate assembly 2. The appropriate angle and thickness of the disc spring 4 are calculated and selected to generate an appropriate clamping force. When the engine impact torque exceeds the set limit, it is greater than the force of the disc spring 4, making it impossible for the disc spring 4 to press the driven plate assembly, and the transmission of the overload torque is limited by the sliding friction of the driven plate assembly 2.

[0049] It is understandable that, for those skilled in the art, any equivalent replacement or change to the technical solution and the concept of the utility model should fall within the protection scope of the claims attached to the utility model.

Claims

1. A torque limiting vibration damper, characterized in that: The invention comprises a flywheel assembly (1) and a driven disc assembly (2), a bearing disc (3), a disc spring (4) and a cover (5) which are sequentially placed on the flywheel assembly (1); the cover (5) and the flywheel assembly (1) are locked and fixed by bolts (6), thereby pressing the disc spring (4) onto the bearing disc (3); the bearing disc (3) presses the driven disc assembly (2) onto the flywheel assembly (1); the driven disc assembly (2) comprises an inner disc hub (215), an outer disc hub (216) which is sleeved on the outer periphery of the inner disc hub (215) and rotates relatively thereto, and a pre-vibration damping component positioned on the outer disc hub (216); the inner disc hub (215) penetrates the outer disc hub (216) and the pre-vibration damping component. The driven disc (205) is arranged on a side of the outer disc hub (216) close to the flywheel assembly (1), and a vibration damping disc (223) is arranged on a side of the outer disc hub (216) close to the cover (5); the driven disc assembly (2) has two-stage pre-vibration damping and one-stage main vibration damping, wherein the rotation angle range of the first stage pre-vibration damping is less than 7°, the rotation angle range of the second stage pre-vibration damping is 7° to 12°, and the rotation angle range of the main vibration damping is 12° to 30°; a plurality of support blocks (206) are evenly distributed along the outer edge of the outer disc hub (216) for riveting the driven disc (205) and the vibration damping disc (223), and the rotation angle range of the support blocks (206) relative to the outer disc hub (216) is 0 to 18°.

2. The torque limiting vibration damper according to claim 1, characterized in that: The pre-vibration damping assembly comprises a positioning ring II (211), a positioning ring V (214) is arranged on one side of the positioning ring II (211), and a positioning ring VI (210) is arranged on the other side. A plurality of springs II (212) for matching the positioning ring V (214) and a plurality of springs III (213) for matching the positioning ring VI (210) are staggeredly distributed along the circumferential direction of the positioning ring II (211). The positioning ring V (214) is spline-matched with the inner disk hub (215) through a special-shaped hole arranged at the center, and there is no matching clearance. The positioning ring VI (210) is spline-matched with the inner disk hub (215) through a special-shaped hole arranged at the center. The hole is matched with the inner hub (215) to leave a gap L1, and the positioning ring VI (210) is matched with the outer hub (216) through the special-shaped hole set in the center to leave a gap L2; when the inner hub (215) drives the positioning ring V (214) to rotate, the spring II (212) is first compressed to form a primary pre-vibration reduction, and when the inner hub (215) drives the positioning ring V (214) to rotate relative to a distance exceeding the gap L1, the positioning ring VI (210) starts to rotate, so that the spring II (212) and the spring III (213) are both compressed to form a secondary pre-vibration reduction.

3. The torque limiting vibration damper according to claim 2, characterized in that: The positioning ring II (211) is provided with a first slot (224) for inserting the spring II (212) and a second slot (225) for inserting the spring III (213), and both ends of the first slot (224) and the second slot (225) are extended to form a slide groove (230). The positioning ring V (214) is provided with a first positioning claw (226) at a position corresponding to the first slot (224) for inserting into the slide grooves (230) at both ends of the first slot (224) so ​​that the two ends of the spring II (212) are respectively against one of the first positioning claws (226). The positioning ring VI (210) is provided with a second positioning claw (227) at a position corresponding to the second slot (225) for inserting into the slide grooves (230) at both ends of the second slot (225) so that the two ends of the spring III (213) are respectively against one of the second positioning claws (227).

4. The torque limiting vibration damper according to claim 2, characterized in that: A boss (228) is provided on one side of the positioning ring II (211) close to the outer hub (216) for being inserted into a slot (229) provided on the outer hub (216).

5. The torque limiting vibration damper according to claim 2, characterized in that: A limiting groove (231) is provided on the outer circumference of the outer hub (216) at a position corresponding to each supporting block (206), so that the supporting block (206) can rotate relative to the outer hub (216) in the limiting groove (231).

6. The torque limiting vibration damper according to claim 2, characterized in that: Windows (232) are provided at corresponding positions of the driven disc (205), the outer disc hub (216) and the damping disc (223) for inserting springs I (217) so that springs I (217) are evenly distributed along the circumferential direction of the driven disc assembly (2). When the inner disc hub (215) drives the positioning ring VI (210) to rotate relative to a distance exceeding the gap L2, the outer disc hub (216) starts to rotate, so that the springs I (217) are compressed to form a primary main damping.

7. The torque limiting vibration damper according to claim 6, characterized in that: The bearing plate (3) presses the driven plate assembly (2) by means of the pressing force applied by the disc spring (4). When the impact torque of the engine exceeds the pressing force applied by the disc spring (4) to the bearing plate (3), that is, exceeds the rotation angle range of the primary main damping, the driven plate assembly (2) slides relative to the flywheel assembly (1), thereby limiting the transmission of the overload torque.

8. The torque limiting vibration damper according to claim 2, characterized in that: The driven disk (205) and the inner disk hub (215) are positioned by a positioning ring III (207), a washer I (208) is sleeved on the outer periphery of the positioning ring III (207), and a disc spring II (209) is arranged between the washer I (208) and the positioning ring VI (210); a positioning ring I (218) is sleeved on the inner disk hub (215), a positioning ring IV (219) is sleeved on the positioning ring I (218), and the disc spring I (220) presses the positioning ring IV (219) against the positioning ring I (218), so that the positioning ring I (218) and the outer disk hub (216) are pressed tightly; a washer II (221) is also sleeved on the inner disk hub (215), and the disc spring III (222) is pressed between the washer II (221) and the damping disk (223).

9. The torque limiting vibration damper according to claim 1, characterized in that: Two friction plates (201) are arranged on the periphery of the driven plate (205); a plurality of spring plates (202) are fixed between the two friction plates (201) via friction plate rivets (203); the other end of each spring plate (202) is fixed to the driven plate (205) via a spring plate rivet (204); the bearing plate (3) is pressed onto one of the friction plates (201), so that the other friction plate (201) is pressed tightly onto the flywheel assembly (1).

10. The torque limiting vibration damper according to claim 1, characterized in that: The carrier plate (3) is bent toward a side away from the flywheel assembly (1) to form a plurality of bent claws (31); a square hole (51) is provided on the cover (5) at a position corresponding to each bent claw (31); the bent claw (31) is inserted into the corresponding square hole (51) to achieve positioning.

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