A torsion limiter shock absorber

Abstract

The utility model discloses a kind of torsional vibration damper, including cover, flywheel plate, damping disc, torsional vibration damper unit and two groups of elastic pieces, annular storage groove is enclosed between cover and flywheel plate, two convex blocking structures are equipped in storage groove;Damping disc is located in storage groove and its outer circle surface is equipped with two lugs, damping disc is used to be connected with generator or speed reducer transmission;Two groups of elastic pieces are arc-shaped and are located in storage groove, two lugs can be respectively resisted on two elastic pieces to make two groups of elastic pieces resist on two convex blocking structures;Torsional vibration damper unit is connected with flywheel plate transmission, torsional vibration damper unit is used to be connected with the crankshaft transmission of engine.The torsional angle of damping disc can be relatively rotated flywheel plate / cover plate, the spring stiffness of two groups of elastic pieces can be designed smaller, to reduce the inherent frequency of two groups of elastic pieces, so that damping unit plays the role of realizing the vibration of engine, improves the comfort of whole car.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, and in particular to a torsion-limiting shock absorber. Background Technology

[0002] Torque-limiting dampers serve two important functions in automotive transmission systems: providing excellent vibration damping and limiting the transmission of impact torque. Hybrid powertrains and range extender systems can utilize torque-limiting dampers to reduce engine vibration and protect the electric motor from damage caused by engine impact torque. Currently, torque-limiting dampers use multiple sets of straight springs for torque damping. Because straight springs have short travel and small torsional angles, their maximum torque is designed to be higher to accommodate greater engine torque. However, this often results in higher spring stiffness, which in turn leads to higher vibration frequencies, resulting in poor overall damping performance and ride comfort. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a torsion-limiting vibration damper with a large torsion angle and good vibration damping effect.

[0004] A torsion-limiting vibration damper according to an embodiment of the present invention includes a cover plate, a flywheel plate, a damping disc, a torsion-limiting unit, and two sets of elastic elements. The outer edge of the cover plate is connected to the outer edge of the flywheel plate, and an annular receiving groove is formed between the cover plate and the flywheel plate. Two first protrusions and two second protrusions are respectively provided on the two opposing side walls of the cover plate and the flywheel plate. The first protrusions and the second protrusions are arranged in a one-to-one correspondence to form two protrusion structures, and the two protrusion structures are collinear with the center of the receiving groove. The damping disc is disposed in the receiving groove and is coaxial with the receiving groove. The outer circular surface of the damping disc is provided with two lugs, which are aligned with the center of the damping disc. The two lugs can move between the opposing first and second convex blocks. The damping disc is used for transmission connection with a generator or reducer. Both sets of elastic elements are arc-shaped and located in the receiving groove. The two lugs can abut against the two elastic elements respectively to abut against the two convex block structures. The torque limiting unit is transmission connected to the flywheel plate and is used for transmission connection with the crankshaft of the engine.

[0005] It has at least the following beneficial effects: Torque is sequentially transmitted to the torque limiting unit, the housing consisting of the flywheel plate and the cover plate, the two sets of elastic elements, and the damping disc. The torque limiting unit plays the role of transmitting a certain amount of torque. The torque limiting unit limits the maximum torque that the torque limiting damper can transmit. When the engine impact torque exceeds the limit torque that the two sets of elastic elements can withstand and exceeds the designed maximum limit torque, the torque limiting unit can release the engine impact torque, avoiding excessive torque damage to the cover plate, flywheel plate, damping disc, and the damping unit consisting of the two sets of elastic elements. The deformation of the two sets of elastic elements can reduce the vibration during the power transmission / torque transmission process. The damping disc can have a larger torsional angle relative to the rotation of the flywheel plate / cover plate. The spring stiffness of the two sets of elastic elements can be designed to be smaller, thereby reducing the natural frequency of the two sets of elastic elements. This allows the damping unit to filter the vibration brought by the engine and improve the overall vehicle comfort.

[0006] According to some embodiments of this utility model, it further includes a first retainer and a second retainer, both of which are annular. The first retainer is disposed between the cover plate and the damping disc, and the second retainer is disposed between the damping disc and the flywheel plate. The first retainer and the second retainer are used to support the damping disc on the cover plate and the flywheel plate. The first retainer can seal the gap between the cover plate and the damping disc, and the second retainer can seal the gap between the damping disc and the flywheel plate.

[0007] According to some embodiments of the present invention, a first through hole is provided at the central axis of the cover plate, and a plurality of circumferentially distributed first buckles are provided on the first retainer, and the plurality of first buckles are all fastened to the inner wall of the first through hole. A second through hole is provided at the central axis of the flywheel plate, and a plurality of circumferentially distributed second buckles are provided on the second retainer, and the plurality of second buckles are all fastened to the inner wall of the second through hole.

[0008] According to some embodiments of the present invention, the inner wall of the first through hole is provided with a plurality of circumferentially distributed first slots, the first slots penetrate through the two sides of the cover plate, and the plurality of first buckles are respectively engaged in the plurality of first slots.

[0009] According to some embodiments of the present invention, one side of the first retainer is provided with an annular convex ring, the outer circular surface of the convex ring abuts against the inner wall of the first through hole, the inner wall of the first through hole is provided with a plurality of circumferentially distributed first positioning grooves, the first positioning grooves penetrate through the two sides of the cover plate, the outer circular surface of the convex ring is provided with a plurality of positioning protrusions, and the plurality of positioning protrusions are respectively engaged in the plurality of first positioning grooves.

[0010] According to some embodiments of the present invention, it further includes an annular damping disc spring, which is sleeved on the convex ring. The inner wall of the damping disc spring is provided with a plurality of circumferentially distributed second positioning grooves, and the plurality of positioning protrusions are respectively engaged in the plurality of second positioning grooves. The two sides of the damping disc spring respectively abut against the cover plate and the first retainer.

[0011] According to some embodiments of the present invention, a frustum is provided at the center of one side of the damping disc, and the first retainer is sleeved on the frustum.

[0012] According to some embodiments of the present invention, a splined hub is provided at the central axis of the damping disc, the splined hub is directly opposite the first through hole, and the damping disc is connected to the generator or reducer through the splined hub.

[0013] According to some embodiments of the present invention, the torque limiting unit includes a claw disk, an input disk, an annular torque limiting disc spring, and two friction plates. The claw disk is provided with multiple circumferentially distributed claws, which sequentially clamp the torque limiting disc spring, the input disk, one friction plate, the flywheel plate, and the other friction plate onto the claw disk. The input disk is made of a flexible material and is used for transmission connection with the crankshaft of the engine.

[0014] According to some embodiments of the present invention, the storage groove is provided with two arc-shaped guide grooves, and the two sets of elastic elements are respectively disposed in the two guide grooves. The guide grooves are provided with grease to lubricate the elastic elements.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 2 This is an exploded structural diagram of an embodiment of the present utility model; Figure 3 This is a half-sectional structural diagram of the vibration damping unit and guide groove according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of the structure of the cover plate, guide groove, damping disc and elastic element in an embodiment of the present utility model; Figure 5 This is a schematic diagram of the structure of the first cage, the damping disc, the second cage, and the damping disc spring according to an embodiment of the present utility model; Figure 6This is a partial cross-sectional view of an embodiment of the present utility model; Icon labels: Cover plate 1, first protrusion 11, first through hole 12, first positioning groove 121; Flywheel plate 2, second protrusion 21, second through hole 22; 3. Vibration damper plate; 31. Lug; 32. Frustum; 33. Splined hub; Elastic element 4; Torque limiting unit 5, claw plate 51, hook claw 511, input plate 52, snap-fit ​​hole 521, counterweight ring 522, torsion limiting disc spring 53, friction plate 54; First retainer 6, first buckle 61, protruding ring 62, positioning protrusion 621; Second retainer 7, second buckle 71; Damping disc spring 8, second positioning groove 81; Guide groove 9. Detailed Implementation

[0017] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] In the description of this utility model, the use of "first" and "second" is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features or the order of the technical features.

[0019] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0020] Reference Figure 1 and Figure 2 This utility model discloses a torsion-limiting vibration damper, including a cover plate 1, a flywheel plate 2, a damping disc 3, a torsion-limiting unit 5, and two sets of elastic elements 4. Both the cover plate 1 and the flywheel plate 2 are disc-shaped. A first through hole 12 is provided at the central axis of the cover plate 1, and a second through hole 22 is provided at the central axis of the flywheel plate 2. The first through hole 12 and the second through hole 22 are coaxial. The outer edge of the cover plate 1 and the outer edge of the flywheel plate 2 are connected, forming an annular receiving groove between the cover plate 1 and the flywheel plate 2. (Refer to...) Figure 3On the two opposing sidewalls of the cover plate 1 and the flywheel plate 2, there are two first protrusions 11 and two second protrusions 21, respectively. The straight lines of the two first protrusions 11 intersect with and are perpendicular to the central axis of the cover plate 1, and the straight lines of the two second protrusions 21 intersect with and are perpendicular to the central axis of the flywheel plate 2. The first protrusions 11 and the second protrusions 21 are arranged one-to-one to form two protrusion structures. Both protrusion structures extend into the receiving groove. The straight lines of the two protrusion structures intersect with and are perpendicular to the central axis of the receiving groove. There is a gap between the corresponding first protrusions 11 and second protrusions 21. The vibration damping disc 3 is located in the receiving groove and is coaxial with the receiving groove. Figure 2 The outer circular surface of the damping disc 3 is provided with two lugs 31. The straight line on which the two lugs 31 are located intersects with and is perpendicular to the central axis of the damping disc 3. The two lugs 31 can move between the gap between the opposing first lug 11 and second lug 21. The damping disc 3 is used for transmission connection with a generator or reducer; see reference. Figure 4 and Figure 3 Both sets of elastic elements 4 are arc-shaped and are located in the receiving groove. The two lugs 31 can abut against the two elastic elements 4 respectively to abut against the two protruding structures. The torque limiting unit 5 is connected to the flywheel plate 2 and is used to connect to the crankshaft of the engine.

[0021] When the torque-limiting damper is working, the crankshaft of the engine drives the flywheel plate 2 through the torque-limiting unit 5. The flywheel plate 2, carrying the cover plate 1, rotates around the central axis of the flywheel plate 2, causing the two convex structures to also rotate around the central axis. Both the cover plate 1 and the flywheel plate 2 rotate relative to the damping disc 3. The lugs 31 rotate from the gap between the first lug 11 and the second lug 21 into the receiving groove. The two convex structures abut and compress the two sets of elastic elements 4. The two sets of elastic elements 4 abut against the two lugs 31 respectively and drive the damping disc 3 to rotate. The damping disc 3 can drive the generator or reducer to rotate. It is suitable for hybrid power systems and range extender systems that require limiting the engine torque output to protect the motor end.

[0022] The torque is sequentially transmitted to the torque limiting unit 5, the housing consisting of the flywheel plate 2 and the cover plate 1, the two sets of elastic elements 4, and the damping disc 3. The torque limiting unit 5 plays the role of transmitting a certain amount of torque. The torque limiting unit 5 limits the maximum torque that the torque limiting damper can transmit. When the engine impact torque exceeds the limit torque that the two sets of elastic elements 4 can withstand and exceeds the designed maximum limit torque, the torque limiting unit 5 can release the engine impact torque to avoid excessive torque damaging the damping unit consisting of the cover plate 1, the flywheel plate 2, the damping disc 3, and the two sets of elastic elements 4. The deformation of the two sets of elastic elements 4 can reduce the vibration during the power transmission / torque transmission process. The damping disc 3 can rotate at a relatively large torsional angle relative to the flywheel plate 2 / cover plate 1. The spring stiffness of the two sets of elastic elements 4 can be designed to be small, thereby reducing the natural frequency of the two sets of elastic elements 4. This allows the damping unit to filter the vibration brought by the engine and improve the overall vehicle comfort.

[0023] The angle at which the damping disc 3 rotates relative to the flywheel plate 2 / cover plate 1 is called the torsional angle. The arrangement of the two convex structures, two sets of elastic elements 4, and two lugs 31 allows the damping disc 3 to rotate a larger torsional angle relative to the flywheel plate 2 / cover plate 1. This torsional angle is greater than that of existing torsion-limiting vibration dampers. Under the condition of transmitting equal torque, according to Hooke's Law, the spring stiffness of this new torsion-limiting vibration damper with a larger torsional angle is smaller than that of existing torsion-limiting vibration dampers with a smaller torsional angle. According to the formula for calculating the natural frequency (natural frequency) of a simple harmonic vibration system, with a constant mass, the smaller the spring stiffness, the lower the vibration frequency, meaning that the vibration damping effect of this new torsion-limiting vibration damper is better.

[0024] It should be noted that the flywheel plate 2 is generally flat, and the cover plate 1 is generally cap-shaped. The cover plate 1 covers one side of the flywheel plate 2. The center parts of the flywheel plate 2 and the cover plate 1 are parallel to each other. The tangent of the outer edge of the cover plate 1 is perpendicular to the flywheel plate 2. The flywheel plate 2 and the cover plate 1 are connected by welding, and the connection between the flywheel plate 2 and the cover plate 1 forms a seal.

[0025] Reference Figure 3 and Figure 4 In some embodiments, the storage groove is provided with two arc-shaped guide grooves 9, and two sets of elastic elements 4 are respectively provided in the two guide grooves 9. The two sets of elastic elements 4 are respectively provided in the storage groove through the two guide grooves 9. The guide grooves 9 play a role in guiding the movement and compression direction of the elastic elements 4. The inner wall of the guide groove 9 is smooth, and the friction between the inner wall of the guide groove 9 and the elastic element 4 is small, so as to avoid the elastic element 4 directly contacting the cover plate 1 and the flywheel plate 2, thereby avoiding the wear of the cover plate 1 and the flywheel plate 2.

[0026] The guide groove 9 is provided with grease for lubricating the elastic element 4. The grease can reduce the friction between the guide groove 9 and the elastic element 4, reduce the wear of the guide groove 9 and the elastic element 4, and reduce the torque and energy loss transmitted by the torque limiter damper.

[0027] A set of elastic elements 4 consists of at least one arc-shaped spring. When a set of elastic elements 4 consists of two or more springs, the two or more springs are nested together.

[0028] Reference Figure 2 , Figure 3 and Figure 5 In some embodiments, the torsion damper further includes a first retainer 6 and a second retainer 7, both of which are annular. The first retainer 6 is disposed between the cover plate 1 and the damping disc 3, and the second retainer 7 is disposed between the damping disc 3 and the flywheel plate 2. The first retainer 6 and the second retainer 7 are used to support the damping disc 3 on the cover plate 1 and the flywheel plate 2. The first retainer 6 and the second retainer 7 define the position of the damping disc 3 on the cover plate 1 and the flywheel plate 2, so that the relative position between the damping disc 3, the cover plate 1 and the flywheel plate 2 is stable, and the damping disc 3 can rotate stably on the cover plate 1 and the flywheel plate 2 or the damping disc 3 can rotate stably relative to the cover plate 1 and the flywheel plate 2.

[0029] The first retainer 6 can seal the gap between the cover plate 1 and the damping plate 3, and the second retainer 7 can seal the gap between the damping plate 3 and the flywheel plate 2, so as to prevent the two sets of elastic parts 4 and other parts in the storage groove from being damaged due to foreign objects entering the storage groove.

[0030] Reference Figure 2 and Figure 3 In some embodiments, a first through hole 12 is provided at the central axis of the cover plate 1, and a plurality of circumferentially distributed first buckles 61 are provided on the first retainer 6. The plurality of first buckles 61 are all engaged on the inner wall of the first through hole 12 to achieve positioning of the first retainer 6. The first retainer 6 is connected to the cover plate 1, and the first retainer 6 will move together with the cover plate 1. (Refer to...) Figure 3 and Figure 5 The flywheel plate 2 has a second through hole 22 at its central axis. The second retainer 7 has multiple circumferentially distributed second buckles 71. The multiple second buckles 71 are all locked in the inner wall of the second through hole 22 to realize the positioning of the second retainer 7 and avoid the first retainer 6 and the second retainer 7 from shifting or even failing due to the different movements of the damping disc 3, the cover plate 1, and the flywheel plate 2.

[0031] Reference Figure 3The first cage 6 and the second cage 7 are generally circular or ring-shaped. The first cage 6 has two sides that are respectively attached to the cover plate 1 and the damping disc 3, forming a seal between the cover plate 1 and the damping disc 3. The second cage 7 also has two sides that are respectively attached to the damping disc 3 and the flywheel plate 2, forming a seal between the damping disc 3 and the flywheel plate 2. Both the first cage 6 and the second cage 7 can be made of nylon material, which has high wear resistance and can reduce the frictional resistance experienced by the damping disc 3, the cover plate 1, and the flywheel plate 2.

[0032] Reference Figure 1 and Figure 3 In some embodiments, the inner wall of the first through hole 12 is provided with a plurality of circumferentially distributed first slots. The first slots penetrate through the two sides of the cover plate 1. A plurality of first buckles 61 are respectively engaged in the plurality of first slots, so that the first retainer 6 is completely fixed on the cover plate 1. The first retainer 6 moves with the cover plate 1, preventing the first retainer 6 from rotating or shifting relative to the cover plate 1.

[0033] Reference Figure 3 In some embodiments, one side of the first retainer 6 is provided with an annular protrusion 62, the outer circular surface of the protrusion 62 abuts against the inner wall of the first through hole 12, and a seal is formed between the outer circular surface of the protrusion 62 and the inner wall of the first through hole 12. The other side of the first retainer 6 abuts against the side of the damping plate 3 and forms a seal.

[0034] Reference Figure 1 The inner wall of the first through hole 12 is provided with a plurality of circumferentially distributed first positioning grooves 121. The first positioning grooves 121 penetrate through the two sides of the cover plate 1. The outer circular surface of the convex ring 62 is provided with a plurality of positioning protrusions 621. The plurality of positioning protrusions 621 are respectively inserted into the plurality of first positioning grooves 121 to realize the positioning and connection of the first retainer 6 to the cover plate 1. The first retainer 6 moves synchronously with the cover plate 1.

[0035] Reference Figure 3 In some embodiments, the torsional damper further includes a ring-shaped damping disc spring 8, which is sleeved on a convex ring 62. The convex ring 62 of the first retainer 6 serves to support the damping disc spring 8. (Refer to...) Figure 5 The inner wall of the damping disc spring 8 is provided with multiple circumferentially distributed second positioning grooves 81, and multiple positioning protrusions 621 are respectively inserted into the multiple second positioning grooves 81. The damping disc spring 8 is connected to the first retainer 6 through the positioning protrusions 621 and the second positioning grooves 81, so that the damping disc spring 8 moves synchronously with the first retainer 6. The two sides of the damping disc spring 8 abut against the cover plate 1 and the first retainer 6 respectively. The damping disc spring 8 abuts the first retainer 6 against the damping plate 3, ensuring that the other side of the first retainer 6 abuts against the side of the damping plate 3 and forms a seal.

[0036] Reference Figure 3 and Figure 5 In some embodiments, a frustum 32 is provided at the center of one side of the damping disc 3, and a first retainer 6 is fitted onto the frustum 32. The frustum 32 serves to position and support the first retainer 6, preventing the first retainer 6 from shifting radially, and also to improve the structural strength of the damping disc 3. It can be understood that the side of the frustum 32 is a conical surface or an inclined surface, and the central hole of the first retainer 6 is chamfered, with the chamfer abutting against the side of the frustum 32.

[0037] Reference Figure 3 In some embodiments, a splined hub 33 is provided at the central axis of the damping disc 3, the splined hub 33 is directly opposite the first through hole 12, and the damping disc 3 is connected to the generator or reducer through the splined hub 33.

[0038] The damping disc 3, the frustum 32, and the splined hub 33 are integrally formed structures. Alternatively, the frustum 32 and splined hub 33 can be separate structures connected by riveting. The frustum 32 is formed by stamping the damping disc 3; that is, during the machining of the damping disc 3, one side of the damping disc 3 is stamped, resulting in one side forming a concave structure and the other side forming a convex structure, which is the frustum 32. The damping disc 3 has multiple circumferentially distributed perforated holes in the area corresponding to the frustum 32.

[0039] Reference Figure 2 and Figure 6 In some embodiments, the torque limiting unit 5 includes a claw disk 51, an input disk 52, an annular torque limiting disc spring 53, and two friction plates 54. The claw disk 51 is provided with multiple circumferentially distributed hooks 511, which sequentially clamp the torque limiting disc spring 53, the input disk 52, one friction plate 54, the flywheel plate 2, and the other friction plate 54 onto the claw disk 51. The input disk 52 is made of flexible material and is used to connect with the crankshaft of the engine. The torque limiting disc spring 53, the claw disk 51, and the multiple hooks 511 clamp the input disk 52, one friction plate 54, the flywheel plate 2, and the other friction plate 54 together. The torque limiting disc spring 53 provides a clamping force, so that the two friction plates 54 generate friction between the input disk 52 and the flywheel plate 2, and between the flywheel plate 2 and the claw disk 51, respectively, thereby enabling the input disk 52 and the flywheel plate 2 to transmit torque, and the input disk 52 and the flywheel plate 2 to rotate synchronously. When the engine output torque is too high, exceeding the limit torque that the two sets of elastic elements 4 can transmit and the maximum limiting torque of the torque limiting unit 5, the friction plate 54 can release the engine's impact torque through sliding friction, thereby cutting off the engine's power and protecting the generator or reducer. When the engine output torque returns to normal, the friction force of the friction plate 54 is restored, and the engine power is restored and transmitted to the generator or reducer through the torque limiting damper.

[0040] The input disc 52 is made of a flexible material, allowing it to deform to cushion impacts. A flange, made of a rigid material, is riveted to the input disc 52. The input disc 52 and the flange are coaxially aligned, and the input disc 52 connects to external equipment, such as an engine crankshaft, via the flange. The flange ensures a secure connection between the input disc 52 and the external equipment, guarantees torque transmission, and reduces wear between the input disc 52 and the external equipment.

[0041] Reference Figure 6 The input disk 52 is provided with multiple snap-fit ​​holes 521 distributed circumferentially around the central axis of the input disk 52. The hook 511 passes through the snap-fit ​​holes 521 and hooks onto the outer edge of the torsion disc spring 53. A counterweight ring 522 is connected to the input disk 52 to increase the rotational inertia of the input disk 52.

[0042] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A torsional damping damper, characterized in that, include: Cover plate; The flywheel plate has an outer edge connected to the outer edge of the cover plate, and the cover plate and the flywheel plate form an annular storage groove. Two first protrusions and two second protrusions are respectively provided on the two opposing side walls of the cover plate and the flywheel plate. The first protrusions and the second protrusions are arranged in a one-to-one correspondence to form two protrusion structures. The two protrusion structures are on the same straight line as the center of the storage groove. A vibration damping disc is disposed in a receiving groove and is coaxial with the receiving groove. The outer circular surface of the vibration damping disc is provided with two lugs. The two lugs are on the same straight line as the center of the vibration damping disc. The two lugs can move in the gap between the opposing first and second lugs. The vibration damping disc is used for transmission connection with a generator or reducer. Two sets of elastic elements, both arc-shaped and located in the receiving groove, and two lugs that can respectively abut against the two elastic elements to abut against the two protruding structures; A torque limiting unit is connected to the flywheel plate drive, and the torque limiting unit is used to connect to the crankshaft drive of the engine.

2. The torsional damper according to claim 1, characterized in that, It also includes a first retainer and a second retainer, both of which are annular. The first retainer is disposed between the cover plate and the damping disc, and the second retainer is disposed between the damping disc and the flywheel plate. The first retainer and the second retainer are used to support the damping disc on the cover plate and the flywheel plate. The first retainer can seal the gap between the cover plate and the damping disc, and the second retainer can seal the gap between the damping disc and the flywheel plate.

3. A torsion-limiting vibration damper according to claim 2, characterized in that, The cover plate has a first through hole at its central axis, and the first retainer has a plurality of circumferentially distributed first buckles, which are all engaged in the inner wall of the first through hole. The flywheel plate has a second through hole at its central axis, and the second retainer has a plurality of circumferentially distributed second buckles, which are all engaged in the inner wall of the second through hole.

4. A torsional damper according to claim 3, characterized in that, The inner wall of the first through hole is provided with a plurality of circumferentially distributed first slots, the first slots penetrate through the two sides of the cover plate, and the plurality of first buckles are respectively engaged in the plurality of first slots.

5. A torsional damper according to claim 3, characterized in that, One side of the first retainer is provided with an annular convex ring. The outer circular surface of the convex ring abuts against the inner wall of the first through hole. The inner wall of the first through hole is provided with a plurality of circumferentially distributed first positioning grooves. The first positioning grooves penetrate through the two sides of the cover plate. The outer circular surface of the convex ring is provided with a plurality of positioning protrusions. The plurality of positioning protrusions are respectively engaged in the plurality of first positioning grooves.

6. A torsional damper according to claim 5, characterized in that, It also includes a ring-shaped damping disc spring, the inner wall of which is provided with a plurality of circumferentially distributed second positioning grooves. The damping disc spring is sleeved on the convex ring, and the plurality of positioning protrusions are respectively engaged in the plurality of second positioning grooves. The two sides of the damping disc spring abut against the cover plate and the flywheel plate respectively.

7. A torsional damper according to claim 5, characterized in that, The damping disc has a frustum at the center of one side, and the first retainer is fitted onto the frustum.

8. A torsion-limiting vibration damper according to claim 3, characterized in that, A splined hub is provided at the central axis of the vibration damping disc, and the splined hub is directly opposite the first through hole. The vibration damping disc is connected to the generator or reducer through the splined hub.

9. A torsion-limiting vibration damper according to claim 1, characterized in that, The torque limiting unit includes a claw disk, an input disk, an annular torque limiting disc spring, and two friction plates. The claw disk is provided with multiple circumferentially distributed claws, which sequentially clamp the torque limiting disc spring, the input disk, one friction plate, the flywheel plate, and the other friction plate onto the claw disk. The input disk is made of a flexible material and is used for transmission connection with the crankshaft of the engine.

10. A torsional damper according to claim 1, characterized in that, The storage groove is provided with two arc-shaped guide grooves, and the two sets of elastic elements are respectively disposed in the two guide grooves. The guide grooves are provided with grease for lubricating the elastic elements.

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