Torsional vibration damper and torque damping device

Abstract

The utility model relates to a torsional vibration damper and a torque damping device.The torsional vibration damper comprises a hub, an outer gear, a limiting baffle and a cylindrical section are arranged on the radial outer wall in the axial direction, the cylindrical section is located on one side of the limiting baffle in the axial direction, and the outer gear is located on the other side of the limiting baffle in the axial direction; first protruding blocks protruding axially are arranged on the axial side of the limiting baffle and located on the radial outer side of the cylindrical section in the radial direction at intervals. The single flange plate comprises an inner tooth groove, the inner tooth groove is meshed with the outer gear, a tooth gap exists between the inner tooth groove and the outer gear, a second protruding block protruding in the axial direction is arranged on one axial side of the single flange plate, and the circumferential side wall of the single flange plate is aligned with the circumferential side wall of the first protruding block. The torsion spring is arranged on the cylindrical section in a sleeving mode, located between the first protruding block and the cylindrical section in the radial direction and comprises a first end and a second end, the first end and the second end abut against one circumferential side wall and the other circumferential side wall of the first protruding block and the second protruding block respectively, and the torsion spring enables the single flange plate and the hub to rotate relatively within the tooth clearance range.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle shock absorption, in particular to a torsional vibration damper and a torque vibration damping device. Background Art

[0002] Internal combustion engines will continue to power vehicles for the foreseeable future. Regardless of the type of transmission used, the fundamental requirements for torque transfer between the engine and transmission remain the same: to reduce torsional vibration and rotational non-uniformity while ensuring starting and delivering average torque. Therefore, a vibration damping device is typically installed between the engine and transmission to absorb and dampen torque vibrations from the engine (forward torque transfer) or from the motor within the transmission case (reverse torque transfer).

[0003] Existing torsional vibration damping devices generally include a torque limiter and a torsional vibration damper. Torque is transmitted in the torsional vibration damper through a coil spring, and torsional vibration and torsional shock during the torque transmission process are absorbed. However, the coil spring needs to reach a certain transmission torque before it can be compressed to absorb torsional vibration and shock. This certain transmission torque is the minimum transmission torque of the coil spring. When the transmitted torque is less than the minimum transmission torque of the coil spring, the coil spring cannot be compressed. At this time, the torque transmission between the single flange and the first cover plate and the second cover plate is equivalent to rigid transmission. The coil spring cannot absorb torque vibration and shock, which is not conducive to improving the noise, vibration and harshness (NVH) of the entire vehicle.

[0004] In order to solve this problem, a pre-damper 30 is usually provided in the torsional vibration damping device. Figure 1 As shown, a pre-damper 30 is typically installed at the torsional vibration damper to damp the transmitted torque when it is less than the minimum transmittable torque of the coil spring and the coil spring cannot be compressed. However, existing pre-damper structures are relatively complex and have many components, resulting in high costs and occupying a large axial space.

[0005] In addition, if Figure 2 and Figure 3 As shown, the structures currently used to limit the axial displacement of the hub are usually diaphragm springs or wave washers. These components are not only expensive in themselves, but also, when used with the existing pre-damper, will further increase the axial space occupied by the torsional vibration damper, which is contrary to the requirement of compact design of the torque vibration damping device. Utility Model Content

[0006] In order to overcome the problems existing in the related art, the present disclosure provides a torsional vibration damper and a torque vibration damping device.

[0007] According to a first aspect of an embodiment of the present disclosure, the present disclosure provides a torsional vibration damper, comprising: a hub, a radial outer wall of which is axially provided with an external gear, a limiting baffle and a cylindrical section, the cylindrical section being located on one axial side of the limiting baffle, the external gear being located on the other axial side of the limiting baffle, an axially protruding first protrusion being provided on one axial side of the limiting baffle, the first protrusion being radially spaced and located radially outside the cylindrical section; a single flange, the radial inner end of which includes an inner tooth groove, the inner tooth groove being meshed with the external gear and having a tooth gap, the axial side of the single flange A second axially protruding protrusion is provided, and the circumferential side wall of the second protrusion is aligned with the circumferential side wall of the first protrusion; and a torsion spring is sleeved on the cylindrical segment and radially located between the first protrusion and the cylindrical segment, the torsion spring includes a first end and a second end, wherein the first end of the torsion spring abuts against one of the circumferential side walls of the first protrusion and the second protrusion, and the second end of the torsion spring abuts against the other circumferential side wall of the first protrusion and the second protrusion, and the torsion spring causes the single flange and the hub to rotate relative to each other within the tooth gap range.

[0008] In some embodiments, the first bump and the second bump are concentrically arranged arc-shaped plates, and the first bump and the second bump have the same central angle, so that the circumferential side wall of the second bump is aligned with the circumferential side wall of the first bump along the meridian line.

[0009] In some embodiments, the radial inner wall of the first protrusion and the radial outer wall of the second protrusion are in radial contact with each other.

[0010] In some embodiments, the second protrusion is formed by directly bending a circumferential portion of the radial inner end of the single flange toward one axial side.

[0011] In some embodiments, the position of the limiting baffle corresponding to the first protrusion forms a groove toward the radial inner groove, the circumferential width of the groove is greater than the circumferential width of the second protrusion, and at least part of the second protrusion is located in the groove.

[0012] In some embodiments, the radial bottom wall of the groove is flush with the radial outer wall of the first protrusion.

[0013] In some embodiments, the torsional vibration damper also includes a friction sleeve, which is sleeved on the cylindrical section of the wheel hub. In the axial direction, one axial end of the torsion spring abuts against one axial side of the limit baffle, and the other axial end of the torsion spring abuts against the friction sleeve.

[0014] In some embodiments, the tooth top circle diameter of the external gear is smaller than the outer diameter of the limit baffle, and the radial inner end of the single flange abuts against the other axial side of the limit baffle.

[0015] In some embodiments, the stiffness of the torsion spring is determined by basic parameters of the torsion spring.

[0016] According to a second aspect of an embodiment of the present disclosure, the present disclosure provides a torque vibration damping device, comprising: a torque limiter; and the torsional vibration damper as described in the first aspect, located radially inside the torque limiter.

[0017] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: there is a tooth gap between the inner tooth groove of the single flange and the outer gear of the hub. When the single flange rotates relative to the hub within the tooth gap range, the elastic spokes are elastic, which can allow the single flange and the hub to rotate relative to each other, play a pre-damping role, and avoid direct collision between the inner tooth groove and the outer gear, thereby improving NVH performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0019] Figure 1 It is a schematic diagram of the position structure of the pre-damper in the prior art;

[0020] Figure 2 It is a schematic diagram of the position structure of the coil spring in the prior art;

[0021] Figure 3 is a cross-sectional view of a torque vibration reduction device according to an exemplary embodiment;

[0022] Figure 4 This is a schematic diagram of the tooth clearance between the external gear of the hub and the internal tooth groove of the single flange.

[0023] Figure 5 This is an exploded diagram of the single flange, wheel hub, torsion spring, and friction sleeve before assembly;

[0024] Figure 6 yes Figure 3 Partial side view of the assembled single flange, hub, torsion spring, and friction sleeve;

[0025] Figure 7 It is a schematic diagram of the structure of the torsion spring when the single flange and the hub are in the initial position;

[0026] Figure 8 It is a structural diagram of the torsion spring when the single flange and the hub rotate relative to each other. DETAILED DESCRIPTION

[0027] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0028] In this disclosure, unless otherwise specified, the axial direction A, radial direction R, and circumferential direction W refer to the axial direction A, radial direction R, and circumferential direction W of the torque damping device 100, respectively; the axial side refers to Figure 3 The right side of the axis refers to Figure 3 The left side of the radial direction (or radial outer end) refers to the radial direction R away from Figure 3 On the side of the central axis O ( Figure 3 The radial inner side (or radial inner end) refers to the side close to the central axis O in the radial direction R ( Figure 3 on the lower side of the center).

[0029] In addition, a "torque-transmitting connection" refers to the ability to transmit driving force / torque between two components. These two components can be directly connected or through various transmission mechanisms or connection structures to achieve the above function. The term "torsion-resistant connection" refers to the connection between two elements in a manner that prevents rotation relative to each other. This can be achieved through a press fit (i.e., an interference fit) or by forming the two components in an integral manner. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0030] like Figure 4 As shown, the present disclosure provides a torque vibration damping device 100, which is a device arranged between an engine and a transmission, and is used to transmit torque between the engine (not shown) and the transmission or a gearbox (not shown) and reduce torsional vibration or torsional shock when transmitting torque.

[0031] The torque damping device 100 may include a torque limiter 10 and a torsional vibration damper 20. The torque limiter 10 is used to transmit torque between the engine and the transmission that does not exceed a predetermined torque, thereby preventing excessive torque from being transmitted between the engine and the transmission, which could damage the engine or transmission. The torsional vibration damper 20 can reduce torsional vibration or torsional shock during torque transmission between the engine and the transmission. Thus, the torque limiter 10 and the torsional vibration damper 20 provide the torque damping device 100 with both torque limiting and torque damping functions.

[0032] In this embodiment, the torque limiter 10 is located radially outside the torsional vibration damper 20. Figure 1 As shown, the torque limiter 10 includes at least a retaining plate 11, two friction plates 12, a support plate 13, a diaphragm spring 14, a first cover plate 15 and a second cover plate 16. The radial inner side of the retaining plate 11 is clamped between the two friction plates 12, the two friction plates 12 are clamped between the first cover plate 15 and the support plate 13, and the diaphragm spring 14 abuts axially A between the support plate 13 and the second cover plate 16.

[0033] The engine rotates and transmits torque to the retaining plate 11, which generates relative rotation or rotation tendency in the circumferential direction W. Due to the axial compression of the diaphragm spring 14, friction is generated on the contact surface between the radial inner side of the retaining plate 11 and the two friction plates 12. Friction is also generated on the contact surfaces between the two friction plates 12 and the first cover plate 15 and the support plate 13 respectively.

[0034] After receiving the torque transmitted by the engine, the radial outer side of the retaining plate 11 transmits the torque to the two friction plates 12 through friction force. The two friction plates 12 then transmit the torque to the first cover plate 15 through friction force. The first cover plate 15 and the second cover plate 16 are connected in a torsionally anti-connected manner through multiple fixing bolts arranged along the circumferential direction W to transmit the torque.

[0035] If the torque received by the radially outer side of the retaining plate 11 exceeds the maximum torque between the two friction plates 12 and the retaining plate 11, slippage will occur at the contact surface between the two friction plates 12 and the retaining plate 11, preventing the torque from being transmitted to the torsional vibration damper 20 (i.e., the damper). The maximum torque is the maximum torque provided by the maximum friction force exerted by the diaphragm spring 14 axially pressing the two friction plates 12 and the retaining plate 11. The maximum torque can be adjusted by adjusting the pressing force of the diaphragm spring 14 and / or the friction coefficient of the two friction plates 12 and / or the retaining plate 11.

[0036] Therefore, the torque limiter 10 transmits a preset range of torque to the retaining plate 11 , and excessive torque cannot be transmitted to the damper due to slippage between the two friction plates 12 and the retaining plate 11 , so as to protect the engine or transmission from damage.

[0037] Further, if Figure 3 As shown, the torsional vibration damper 20 includes at least a single flange 21, a coil spring 22 and a hub 23. The single flange 21 has a first window for accommodating the coil spring 22. The single flange 21 is axially located between the first cover plate 15 and the second cover plate 16. The first cover plate 15 and the second cover plate 16 are provided with a second window for accommodating the coil spring 22 at a position corresponding to the first window.

[0038] When the engine transmits torque to the transmission in the forward direction, the first cover plate 15 and the second cover plate 16 rotate after receiving the torque, compressing the coil spring 22 through the circumferential inner wall of the second window. The coil spring 22 is compressed and drives the single flange 21 to rotate through the first window of the single flange 21. The single flange 21 is connected to the wheel hub 23 for torque transmission, and the single flange 21 then transmits the torque to the wheel hub 23 and the input shaft of the transmission, ultimately realizing the torque transmission from the engine to the transmission.

[0039] When the transmission transmits torque to the engine in reverse, the input shaft of the transmission drives the wheel hub 23 to rotate, and the wheel hub 23 drives the single flange 21 to rotate. The single flange 21 compresses the coil spring 22 through the inner wall of the first window. The coil spring 22 is compressed and drives the first cover plate 15 and the second cover plate 16 to rotate through the second window. The first cover plate 15 and the second cover plate 16 transmit the torque to the retaining plate 11 through friction, ultimately realizing the torque transmission from the transmission to the engine.

[0040] Furthermore, it can be seen from the above that when transmitting torque in the forward direction or the reverse direction, the torque is transmitted between the single flange 21 and the first cover plate 15 and the second cover plate 16 by compressing the coil spring 22. When the transmitted torque is less than the minimum transmission torque of the coil spring 22 and the coil spring 22 cannot be compressed, a pre-damper is usually provided in the torsional vibration damping device, which is used to transmit and reduce the torque transmitted.

[0041] To this end, the torsional vibration damper 20 provided by the present disclosure further includes a torsional spring 24 , which can function as a pre-damper in the torsional vibration damper 20 .

[0042] Specifically, the radial outer wall of the hub 23 is provided with an external gear 231 and a radially protruding stop plate 232. The external gear 231 can be located on the axially opposite side of the stop plate 232, that is, the external gear 231 can be located near the first cover plate 15. The radial inner end of the single flange 21 is provided with an internal tooth groove 211. The single flange 21 is sleeved onto the exterior of the hub 23 so that the single internal tooth groove 211 meshes with the external gear 231 of the hub 23. The meshing of the internal tooth groove 211 and the external gear 231 enables a torque-transmitting connection between the single flange 21 and the hub 23.

[0043] like Figure 4As shown, there is a circumferential tooth gap 212 between the inner tooth groove 211 and the outer gear 231. When the single flange 21 transmits torque to the hub 23 or the hub 23 transmits torque to the single flange 21, the single flange 21 and the hub 23 can first rotate relative to each other within the circumferential range of the tooth gap 212 until the relative rotation of the single flange 21 and the hub 23 is greater than the range of the tooth gap 212, that is, the inner wall of the inner tooth groove 211 of the single flange 21 abuts against the outer wall of the external gear 231, and torque can be transmitted between the single flange 21 and the hub 23 again.

[0044] Furthermore, an axially protruding first bump 234 is provided on one axial side of the stop plate 232, and an axially protruding second bump 213 is provided on one axial side of the single flange 21. The circumferential sidewall of the second bump 213 is aligned with the circumferential sidewall of the first bump 234. Furthermore, a cylindrical section 233 is also provided on the radial outer wall of the hub 23, which is also located on one axial side of the stop plate 232 (i.e., the side of the hub 23 that is closer to the second cover plate 16). Therefore, it can be seen that the cylindrical section 233 of the hub 23, the first bump 234 of the stop plate 232, and the second bump 213 of the single flange 21 are all located on the same side, i.e., the side closer to the second cover plate 16.

[0045] The radial inner wall of the first protrusion 234 and the radial outer wall of the cylindrical section 233 are spaced apart in the radial direction R. The torsion spring 24 is sleeved on the cylindrical section 233 and is located between the radial inner wall of the first protrusion 234 and the radial outer wall of the cylindrical section 233 along the radial direction R.

[0046] Furthermore, the torsion spring 24 includes a first end 241 and a second end 242 located at both ends of the axial direction, and includes multiple coils of spring between the first end 241 and the second end 242. The rigidity of the torsion spring 24 can be determined by its material or basic parameters of the spring.

[0047] like Figure 5 As shown, the first end 241 and the second end 242 are bent radially and extend out of the torsion spring 24. Figure 7 As shown, the length of the first end 241 and the second end 242 extending radially ensures that the first end 241 of the torsion spring 24 can simultaneously abut against one of the circumferential side walls of the first protrusion 234 and the second protrusion 213, and the second end 242 of the torsion spring 24 can simultaneously abut against the other circumferential side wall of the first protrusion 234 and the second protrusion 213.

[0048] When no torque is transmitted between the single flange 21 and the wheel hub 23, the single flange 21 and the wheel hub 23 are in an initial position. Due to the tightening force between the first end 241 and the second end 242 of the torsion spring 24, the first end 241 and the second end 242 of the torsion spring 24 abut against the circumferential side walls of the first protrusion 234 and the second protrusion 213. This tightening force ensures that when no torque is transmitted, there will be no accidental relative rotation between the first protrusion 234 and the second protrusion 213, thereby avoiding unnecessary rigid collision between the internal tooth groove 211 of the single flange 21 and the external gear 231 of the wheel hub 23, reducing wear between the single flange 21 and the wheel hub 23, and extending the service life of the single flange 21 and the wheel hub 23.

[0049] like Figure 8 As shown, when the single flange 21 and the hub 23 rotate relative to each other within the tooth gap 212, the first protrusion 234 and the second protrusion 213 overcome the elastic force of the torsion spring 24 and rotate relative to each other. As the relative rotation proceeds, the circumferential side wall of the first protrusion 234 and the circumferential side wall of the second protrusion 213 are no longer aligned, and are staggered with each other in the circumferential direction W.

[0050] The elastic action of the torsion spring 24 provides elastic cushioning during relative rotation between the single flange 21 and the wheel hub 23 within the tooth clearance 212. This elastic cushioning prevents momentary rigid collisions between the inner wall of the internal tooth groove 211 of the single flange 21 and the outer wall of the external gear 231 of the wheel hub 23. The torsion spring 24 absorbs torque vibrations and impacts while transmitting torque, reducing noise and wear. By reducing rigid collisions and vibrations, the torsion spring 24 improves the vehicle's noise, vibration, and harshness (NVH) performance, effectively reduces wear between the single flange 21 and the wheel hub 23, and extends the service life of the single flange 21 and / or the wheel hub 23.

[0051] In some embodiments, the cross-sections of the first and second bumps 234, 213 can be square. The length of the first and second bumps 234, 213 is equal, so that the circumferential sidewalls of the first and second bumps 234, 213 can be aligned. The square cross-section design makes the structures of the first and second bumps 234, 213 relatively simple, and easy to manufacture and process.

[0052] In this embodiment, the first protrusion 234 and the second protrusion 213 are concentrically arranged arc-shaped plates, and the first protrusion 234 and the second protrusion 213 have the same central angle, so that the circumferential side wall of the second protrusion 213 is aligned with the circumferential side wall of the first protrusion 234 along the meridian line.

[0053] like Figure 8As shown, the arcuate cross-section design of the first protrusion 234 and the second protrusion 213 allows one circumferential sidewall of the first protrusion 234 to always abut against the first end 241 of the torsion spring 24, and the other circumferential sidewall of the second protrusion 213 to always abut against the second end 242 of the torsion spring 24, when the single flange 21 rotates circumferentially relative to the hub 23. Ensuring a sufficient radial abutment length between the two allows for more even stress distribution, reducing local stress concentration on the first protrusion 234 or the second protrusion 213, and minimizing wear between the first protrusion 234 or the second protrusion 213 and the first end 241 or the second end 242. Furthermore, the arcuate cross-section provides a better elastic buffering effect during relative rotation, further reducing rigid collision and vibration.

[0054] In some embodiments, the radial inner wall of the first protrusion 234 and the radial outer wall of the second protrusion 213 are radially aligned and abutted. This reduces radial space occupation while also reducing the radially extending length of the first end 241 and the second end 242 of the torsion spring 24. This prevents insufficient rigidity due to excessive radial lengths of the first end 241 and the second end 242. The increased rigidity of the first end 241 and the second end 242 prevents the first end 241 and the second end 242 of the torsion spring 24 from bending during relative rotation, thereby enabling the first end 241 and the second end 242 of the torsion spring 24 to act as a buffer.

[0055] In some embodiments, the second protrusion 213 can be set separately from the single flange 21 and connected to the side wall on the axial side of the single flange 21 through fasteners. The second protrusion 213 can also be integrally formed and set on the side wall on the axial side of the single flange 21.

[0056] In this embodiment, the second protrusion 213 can be formed by directly bending a circumferential portion of the radial inner end of the single flange 21 toward one axial side. Figure 5 As shown, two circumferentially spaced cracks are formed along the radial outer end of the radial inner end of the single flange 21 , and the single flange 21 structure between the two cracks is bent toward one axial side of the single flange 21 to form a second protrusion 213 .

[0057] The second protrusion 213 is formed by directly bending a portion of the single flange 21. The second protrusion 213 is integrated with the single flange 21, which not only has higher overall strength and rigidity, but also does not require additional welding or assembly steps, thereby simplifying the manufacturing process, reducing additional processing steps and the number of parts, and reducing the need for additional materials, thereby reducing production costs, making the entire structure more compact, and reducing the radial space occupied.

[0058] In some embodiments, the first protrusion 234 on the limiting baffle 232 may also be provided separately from the limiting baffle 232 and connected to the side wall on one axial side of the limiting baffle 232 through fasteners.

[0059] In this embodiment, the first protrusion 234 can also be integrally formed and disposed on the axial sidewall of the limiting baffle 232. In this embodiment, a groove 235 is formed on the radially outer wall of the limiting baffle 232 at a position corresponding to the first protrusion 234, facing radially inward. The circumferential width of the groove 235 is greater than the circumferential width of the second protrusion 213. After the internal tooth groove 211 of the single flange 21 is engaged with the external gear 231 of the hub 23, at least a portion of the second protrusion 213 is located within the groove 235 in the radial direction R, so that the sidewall of the groove 235 can circumferentially resist and limit the second protrusion 213.

[0060] The difference in width between the circumferential width of the groove 235 and the circumferential width of the second protrusion 213 can be greater than or equal to the tooth gap 212 between the internal tooth groove 211 of the single flange 21 and the external gear 231 of the hub 23. This not only does not affect the relative rotation of the single flange 21 and the hub 23 within the tooth gap 212, but also enhances the torque transmission strength between the single flange 21 and the hub 23 through the abutment between the sidewall of the groove 235 and the second protrusion 213.

[0061] In some embodiments, the radial bottom wall of the groove 235 can be flush with the radial outer wall of the first protrusion 234, so that when the second protrusion 213 is located in the groove 235, the radial inner wall of the second protrusion 213 can fit with the radial outer wall of the first protrusion 234, thereby reducing the radial space occupied, and at the same time reducing the radial extension length of the first end 241 and the second end 242 of the torsion spring 24, avoiding insufficient rigidity caused by the excessive radial length of the first end 241 and the second end 242.

[0062] In some embodiments, as Figure 5 and Figure 6 As shown, the torsional vibration damper 20 also includes a friction sleeve 25, which is usually torsionally connected to the radial inner end of the second cover plate 16, and the friction sleeve 25 is sleeved on the cylindrical section 233 of the hub 23. The friction sleeve 25 is used to abut against the axial end face of the torsion spring 24, thereby limiting the axial movement of the hub 23.

[0063] Specifically, along the axial direction A, one axial end of the torsion spring 24 (e.g., the end surface where the second end 242 is located) abuts against one axial side of the stop plate 232, while the other axial end of the torsion spring 24 (e.g., the end surface where the first end 241 is located) abuts against the friction sleeve 25. In this way, the stop plate 232 of the hub 23 abuts against the friction sleeve 25 via the torsion spring 24, thereby limiting axial movement of the hub 23 toward the second cover plate 16.

[0064] In some embodiments, the tooth top circle diameter of the external gear 231 is smaller than the outer diameter of the stop plate 232. After the inner tooth groove 211 of the single flange 21 engages with the external gear 231 of the hub 23, the radial inner end of the single flange 21 can abut against the other axial side of the stop plate 232. As can be seen, the stop plate 232 of the hub 23 is clamped between the radial inner end of the single flange 21 and the friction sleeve 25 along the axial direction A, thereby limiting the axial position of the hub 23 on both axial sides of the hub 23. The components used in the related art to limit the axial displacement of the hub 23 using diaphragm springs or wave washers are omitted, which not only reduces the number of parts and reduces costs, but also makes the torsion spring 24 simple and compact in structure, occupying less axial space.

[0065] In summary, the torsion spring 24 can play the dual role of axial limiting the hub 23 and pre-damping.

[0066] It is understood that in this disclosure, "plurality" refers to two or more than two, and other quantifiers are similar. "And / or" describes the association relationship of related objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship. The singular forms "a", "the" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0067] It will be further understood that the terms "first," "second," and the like are used to describe various structures, but these structures should not be limited to these terms. These terms are merely used to distinguish structures of the same type from one another and do not indicate a particular order or degree of importance. In fact, the expressions "first," "second," and the like are fully interchangeable. For example, a first structure could also be referred to as a second structure, and similarly, a second structure could also be referred to as a first structure without departing from the scope of this disclosure.

[0068] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0069] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1. A torsional vibration damper (20), characterized in that: include: A wheel hub (23) is provided with an external gear (231), a limiting baffle (232) and a cylindrical section (233) along the axial direction on its radial outer wall, wherein the cylindrical section (233) is located on one axial side of the limiting baffle (232), and the external gear (231) is located on the other axial side of the limiting baffle (232); an axially protruding first protrusion (234) is provided on one axial side of the limiting baffle (232), and the first protrusion (234) is located radially at intervals on the radial outer side of the cylindrical section (233); A single flange (21), wherein the radial inner end includes an inner tooth groove (211), the inner tooth groove (211) meshes with the outer gear (231) and has a tooth gap (212), and an axially protruding second protrusion (213) is provided on one axial side of the single flange (21), and the circumferential side wall of the second protrusion (213) is aligned with the circumferential side wall of the first protrusion (234); and a torsion spring (24), which is sleeved on the cylindrical section (233) and radially located between the first protrusion (234) and the cylindrical section (233); the torsion spring (24) includes a first end (241) and a second end (242); The first end (241) of the torsion spring (24) abuts against one circumferential side wall of the first protrusion (234) and the second protrusion (213), and the second end (242) of the torsion spring (24) abuts against the other circumferential side wall of the first protrusion (234) and the second protrusion (213). The torsion spring (24) enables the single flange (21) and the wheel hub (23) to rotate relative to each other within the range of the tooth gap (212).

2. The torsional vibration damper (20) according to claim 1, characterized in that The first protrusion (234) and the second protrusion (213) are concentrically arranged arc-shaped plates, and the first protrusion (234) and the second protrusion (213) have the same central angle, so that the circumferential side wall of the second protrusion (213) is aligned with the circumferential side wall of the first protrusion (234) along the meridian line.

3. The torsional vibration damper (20) according to claim 1, characterized in that The radial inner wall of the first protrusion (234) and the radial outer wall of the second protrusion (213) are in radial contact with each other.

4. The torsional vibration damper (20) according to claim 1, characterized in that The second protrusion (213) is formed by directly bending a circumferential portion of the radial inner end of the single flange (21) toward one axial side.

5. The torsional vibration damper (20) according to claim 1, characterized in that The radial outer wall of the limiting baffle (232) is recessed radially inward at a position corresponding to the first protrusion (234) to form a groove (235); the circumferential width of the groove (235) is greater than the circumferential width of the second protrusion (213), and at least a portion of the second protrusion (213) is located in the groove (235).

6. The torsional vibration damper (20) according to claim 5, characterized in that The radial bottom wall of the groove (235) is flush with the radial outer wall of the first protrusion (234).

7. The torsional vibration damper (20) according to claim 1, characterized in that The torsional vibration damper (20) further includes a friction sleeve (25), which is sleeved on the cylindrical section (233) of the hub (23). Along the axial direction (A), one axial end of the torsion spring (24) abuts against one axial side of the limit baffle (232), and the other axial end of the torsion spring (24) abuts against the friction sleeve (25).

8. The torsional vibration damper (20) according to claim 1, characterized in that The tooth top circle diameter of the external gear (231) is smaller than the outer diameter of the limiting baffle (232), and the radial inner end of the single flange (21) abuts against the other axial side of the limiting baffle (232).

9. The torsional vibration damper (20) according to claim 2, characterized in that The stiffness of the torsion spring (24) is determined by the basic parameters of the torsion spring (24).

10. A torque vibration reduction device (100), characterized in that: include: Torque limiter (10); as well as The torsional vibration damper (20) according to any one of claims 1 to 9, located radially inside the torque limiter (10).

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