Torque limiter and power transmission device

Abstract

This invention provides a torque limiter and a power transmission device. The torque limiter can increase the outer diameter of the friction material. An auxiliary plate is mounted on a support plate. The auxiliary plate is positioned radially outward relative to the support plate. Multiple auxiliary plates are arranged in a ring. A first friction material is axially disposed between the support plate and a disc spring. The first friction material is adjacent to the support plate and each auxiliary plate. The support plate has multiple engaging slits extending radially inward from its outer circumference. Each auxiliary plate has a plate body and engaging tabs. The plate body extends circumferentially. The engaging tabs extend radially inward from the plate body. The engaging tabs engage with the engaging slits. The engaging tabs hook within the engaging slits to restrict radially outward movement of the auxiliary plate.

Description

Technical Field

[0001] This invention relates to torque limiters and power transmission devices. Background Technology

[0002] To prevent the transmission of excessive torque, power transmission devices with torque limiters have been proposed. For example, the power transmission device disclosed in Patent Document 1 includes a vibration damping unit and a torque limiter. The torque limiter has a clutch composed of multiple plates, which prevents the transmission of excessive torque by sliding. The torque limiter has a support plate for supporting friction material and a disc spring for pressing the clutch.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2022-55616 Summary of the Invention

[0004] In the torque limiter constructed as described above, it is desirable to increase the outer diameter of the friction material. Therefore, the technical problem of the present invention is to provide a torque limiter capable of increasing the outer diameter of the friction material.

[0005] The torque limiter according to the first method is characterized by comprising: an annular first side plate; an annular support plate spaced apart from the first side plate in the axial direction; a plurality of auxiliary plates mounted on the support plate and disposed radially outward relative to the support plate, the plurality of auxiliary plates being arranged in an annular pattern; a disc spring disposed in the axial direction between the support plate and the first side plate; and a first friction material disposed in the axial direction between the support plate and the disc spring, and adjacent to the support plate and each of the auxiliary plates, the support plate having a plurality of engaging slits extending radially inward from the outer periphery, each of the auxiliary plates having: a plate body portion extending circumferentially; and an engaging piece extending radially inward from the plate body portion and engaging with the engaging slit, the engaging piece being configured to hook within the engaging slit to restrict the auxiliary plate from moving radially outward.

[0006] Previously, because the friction material was supported by a support plate, it was impossible for the outer diameter of the friction material to be larger than the outer diameter of the support plate. However, in the torque limiter described in the first embodiment, since an auxiliary plate is mounted on the support plate, the friction material can be supported by both the support plate and the auxiliary plate. Therefore, the outer diameter of the friction material can be larger than the outer diameter of the support plate. As a result, even when the outer diameter of the support plate is limited, the outer diameter of the friction material can be increased. Furthermore, since the auxiliary plate is configured to hook within the engaging slit of the support plate, radial outward movement of the auxiliary plate due to centrifugal force can be suppressed.

[0007] In the torque limiter according to the first embodiment, the torque limiter according to the second embodiment is configured as follows. The engaging tab has: an extension extending radially inward from the plate body portion; and a hook portion extending circumferentially from the extension.

[0008] In the torque limiter of the second embodiment, the torque limiter of the third embodiment is configured as follows: The auxiliary plate has a pair of engagement tabs, the hook portions of each engagement tab extending circumferentially toward each other.

[0009] In the torque limiter of the third embodiment, the torque limiter of the fourth embodiment is configured as follows: The support plate has a pair of protrusions projecting axially, and a pair of engaging tabs are disposed circumferentially between the pair of protrusions.

[0010] Of the torque limiters involved in any of the first to fourth embodiments, the torque limiter involved in the fifth embodiment is configured as follows: The first friction material has a groove on the surface in contact with the support plate and each of the auxiliary plates, the groove overlapping the boundaries of the engaging slit and the engaging piece when viewed axially.

[0011] In any of the torque limiters in the first to fifth embodiments, the torque limiter in the sixth embodiment further comprises: an annular second side plate, arranged such that the support plate, each of the auxiliary plates, the disc spring and the first friction material are disposed between the second side plate and the first side plate; a pressure plate, disposed axially between the disc spring and the first friction material; and a second friction material, disposed axially between the support plate and the second side plate.

[0012] In any of the torque limiters described in the first to fifth embodiments, the torque limiter described in the seventh embodiment further comprises: an annular second side plate, arranged such that the support plate, each of the auxiliary plates, the disc spring, and the first friction material are disposed between the second side plate and the first side plate; a pressure plate, axially disposed between the disc spring and the first friction material; and a second friction material, axially disposed between the support plate and the second side plate, the first friction material having a first through hole extending axially, the second friction material having a second through hole extending axially, and the support plate having: a first protrusion. A first protrusion protrudes toward the first friction material side and engages with the first through hole; a second protrusion protrudes toward the second friction material side and engages with the second through hole; a first region is defined by a pair of circumferentially adjacent engaging slits and has the first protrusion therein; and a second region is defined by a pair of circumferentially adjacent engaging slits and has the second protrusion therein, wherein the portion of the first region that bends toward the first friction material side extends in a straight line by being clamped by the pressure plate and the second side plate, and the portion of the second region that bends toward the second friction material side extends in a straight line by being clamped by the pressure plate and the second side plate.

[0013] Of the torque limiters involved in any of the first to seventh embodiments, the torque limiter involved in the eighth embodiment is configured as follows: the inner periphery of the disc spring is arranged radially outward relative to the outer periphery of the support plate, and radially inward relative to the outer periphery of each of the auxiliary plates. According to this configuration, the first friction material can be clamped by the disc spring and the auxiliary plates, thus allowing a uniform load to be applied to the first friction material even when the disc spring and the support plate are both taken from a single plate.

[0014] Of the torque limiters involved in any of the first to eighth embodiments, the torque limiter involved in the ninth embodiment is configured as follows: The disc spring has the same thickness as the support plate.

[0015] The power transmission device according to the tenth method includes: a torque limiter according to any one of the first to ninth methods; and a vibration damping unit having an input rotating body, an output rotating body configured to rotate integrally with the support plate, and an elastic member elastically connecting the input rotating body and the output rotating body.

[0016] According to the present invention, the outer diameter of the friction material can be increased. Attached Figure Description

[0017] Figure 1 This is the front view of the power transmission device.

[0018] Figure 2 yes Figure 1Sectional view along line II-II.

[0019] Figure 3 This is the front view of the support plate.

[0020] Figure 4 This is a cross-sectional view of the torque limiter before assembly.

[0021] Figure 5 This is a cross-sectional view of the assembled torque limiter.

[0022] Figure 6 This is a front view of the support plate with the auxiliary plate installed.

[0023] Figure 7 This is the main view of the auxiliary panel.

[0024] Figure 8 This is the front view of the first friction material.

[0025] Figure 9 yes Figure 8 The IX-IX vector view.

[0026] Figure 10 This is an enlarged front view of the support plate with the first friction material and auxiliary plate installed.

[0027] Figure 11 This is a front view of the plate with the support plate, disc spring, and multiple auxiliary plates removed.

[0028] Figure 12 This is a front view of the auxiliary plate involved in the modified example of the mounting on the support plate.

[0029] Figure 13 This is a front view of the auxiliary plate involved in the modified example of the mounting on the support plate.

[0030] Figure 14 This is a front view of the auxiliary plate involved in the modified example of the mounting on the support plate.

[0031] Explanation of reference numerals in the attached figures

[0032] 3: Torque limiter; 31: First side plate; 32: Second side plate; 33: Support plate; 331: First protrusion; 332: Second protrusion; 333: First region; 334: Second region; 335: Engaging slit; 34: Auxiliary plate; 342: Main plate part; 343: Engaging piece; 344: Extension part; 345: Hook part; 35a: First friction material; 351a: First through hole; 351b: Second through hole; 352a: Groove part; 35b: Second friction material; 36: Pressure plate; 37: Disc spring; 4: Vibration damping unit; 41: Input rotating body; 42: Output rotating body; 43: Elastic member; 100: Power transmission device. Detailed Implementation

[0033] Hereinafter, the torque limiter 3 and the power transmission device 100 according to this embodiment will be described with reference to the accompanying drawings. It should be noted that, in the following description, axial direction refers to the direction in which the rotation axis O of the torque limiter 3 and the power transmission device 100 extends. Furthermore, circumferential direction refers to the circumferential direction of the circle centered on the rotation axis O, and radial direction refers to the radial direction of the circle centered on the rotation axis O. Additionally, axial first side refers to... Figure 2 The left side, the second side of the axis, means Figure 2 On the right side.

[0034] Figure 1 This is the front view of the power transmission device 100. Figure 2 yes Figure 1 Sectional view along line II-II. (See also...) Figure 1 as well as Figure 2 As shown, the power transmission device 100 includes a torque limiter 3 and a vibration damping unit 4. The torque limiter 3 and the vibration damping unit 4 rotate substantially integrally with each other. The power transmission device 100 is disposed between an internal combustion engine (not shown) and an output-side component (not shown). It should be noted that the output-side component refers to, for example, an electric motor, a generator, or a transmission. The power transmission device 100 is mounted on a flywheel (not shown). For example, in... Figure 2 In this configuration, the internal combustion engine is positioned on the left side of the power transmission device 100, and the output-side component is positioned on the right side of the power transmission device 100. The power transmission device 100 is configured to limit the torque transmitted between the internal combustion engine and the output-side component, and to attenuate torque variations.

[0035] [Vibration Damping Unit]

[0036] The vibration damping unit 4 is mounted on the torque limiter 3. The vibration damping unit 4 is configured to dampen rotational fluctuations. The vibration damping unit 4 has an input rotating body 41, an output rotating body 42, and an elastic member 43.

[0037] <Input solid of revolution>

[0038] The input rotating body 41 rotates integrally with the support plate 33 of the torque limiter 3 (described later). The input rotating body 41 has a first plate 41a and a second plate 41b. Both the first plate 41a and the second plate 41b are annular components with a central hole. The first plate 41a and the second plate 41b rotate integrally with each other. Furthermore, the first plate 41a and the second plate 41b cannot move relative to each other in the axial direction.

[0039] The first plate 41a and the second plate 41b are arranged axially spaced apart from each other. The second plate 41b is arranged on the second side of the axial direction relative to the first plate 41a.

[0040] The first plate 41a and the second plate 41b each have a plurality of windows 411a and 411b. It should be noted that in this embodiment, the first plate 41a and the second plate 41b each have four windows 411a and 411b, but their number is not limited to this.

[0041] The windows 411a and 411b are arranged at intervals in the circumferential direction. Each window 411a and 411b is configured to accommodate an elastic member 43.

[0042] <Output Rotational Body>

[0043] The output rotating body 42 is configured to transmit torque from the input rotating body 41 to the output side member. The output rotating body 42 is axially disposed between the first plate 41a and the second plate 41b. The output rotating body 42 is configured to be able to rotate relative to the first plate 41a and the second plate 41b.

[0044] The output rotating body 42 has a hub 421 and a flange plate 422. The hub 421 and the flange plate 422 are integrally formed as a single component, but they can also be configured as different components.

[0045] The hub 421 is cylindrical and is disposed within the central holes of the first plate 41a and the second plate 41b. An axially extending spline hole is formed on the inner circumference of the hub 421. The input shaft of the output-side component can engage with this spline hole.

[0046] A flange plate 422 extends radially from the outer peripheral surface of the hub 421. The flange plate 422 is formed in an annular shape. The flange plate 422 is configured to rotate relative to the first plate 41a and the second plate 41b. The flange plate 422 is axially disposed between the first plate 41a and the second plate 41b.

[0047] The flange plate 422 has a plurality of receiving holes 423. It should be noted that in this embodiment, the flange plate 422 has four receiving holes 423, but the number is not limited to this. The receiving holes 423 are arranged at intervals in the circumferential direction. Each receiving hole 423 is configured to receive an elastic member 43. Each receiving hole 423 is positioned to overlap with each window portion 411a, 411b when viewed axially.

[0048] <Elastic Components>

[0049] The elastic member 43 is configured to elastically connect the input rotating body 41 and the output rotating body 42 in the rotational direction. The elastic member 43 is, for example, a helical spring.

[0050] The elastic member 43 is housed in the receiving hole 423 of the output rotating body 42. In addition, the elastic member 43 is housed in the window portion 411a of the first plate 41a and also in the window portion 411b of the second plate 41b.

[0051] [Torque Limiter]

[0052] The torque limiter 3 is configured to rotate about the rotation axis O. The torque limiter 3 is positioned on the second axial side relative to the flywheel. The torque limiter 3 is annular. The torque limiter 3 is mounted on the flywheel.

[0053] The torque limiter 3 is configured to limit the torque transmitted between the flywheel and the damping unit 4. That is, the torque limiter 3 is configured to limit the transmission of torque exceeding a specified value in the power transmission device 100.

[0054] The torque limiter 3 has a first side plate 31, a second side plate 32, a support plate 33, multiple auxiliary plates 34, a first friction material 35a, a second friction material 35b, a pressure plate 36, and a disc spring 37.

[0055] <First side panel and second side panel>

[0056] A first side plate 31 and a second side plate 32 are mounted on a flywheel. The first side plate 31 and the second side plate 32 rotate integrally with the flywheel. The first side plate 31 and the second side plate 32 are annular. The second side plate 32 is axially spaced apart from the first side plate 31. The second side plate 32 is positioned on the second axial side relative to the first side plate 31. A support plate 33, auxiliary plates 34, a first friction material 35a, a second friction material 35b, a pressure plate 36, and a disc spring 37 are disposed between the first side plate 31 and the second side plate 32. The thickness of the second side plate 32 is greater than the thickness of the first side plate 31.

[0057] <Support Plate>

[0058] The support plate 33 is an annular plate. The support plate 33 is configured to rotate about the rotation axis O. The support plate 33 is axially spaced from the first side plate 31.

[0059] Support plate 33 is mounted on input rotating body 41. More specifically, support plate 33 is mounted on first plate 41a. For example, support plate 33 is mounted on first plate 41a by fastening member 101. Support plate 33 rotates integrally with input rotating body 41. It should be noted that support plate 33 is a different component from first plate 41a, but support plate 33 can also be integrally formed with first plate 41a as a single component.

[0060] Figure 3 This is the front view of the support plate 33. It should be noted that... Figure 3 In the diagram, the second friction material 35b is also shown with a double-dotted line. For example... Figure 3As shown, the support plate 33 has a plurality of engaging slits 335. Each engaging slit 335 extends radially inward from the outer peripheral surface of the support plate 33. More specifically, the engaging slit 335 extends radially inward from the outer peripheral surface of the support plate 33, with its front end extending circumferentially. The front ends of an adjacent pair of engaging slits 335 extend toward each other. The support plate 33 has a plurality of such pairs of engaging slits 335.

[0061] The radially inner end of each engaging slit 335 is positioned radially inner relative to the inner periphery of the first friction material 35a and the second friction material 35b. That is, a portion of each engaging slit 335 is exposed from the first friction material 35a and the second friction material 35b when viewed axially.

[0062] Each engaging slit 335 opens radially outward. The engaging slit 335 is formed on the outer periphery of the support plate 33. The engaging slit 335 extends axially through the support plate 33. The engaging slits 335 are spaced apart from each other in the circumferential direction.

[0063] like Figure 2 as well as Figure 3 As shown, the support plate 33 has a plurality of first protrusions 331 and a plurality of second protrusions 332. The first protrusions 331 and second protrusions 332 are alternately arranged in the circumferential direction. The first protrusions 331 and second protrusions 332 are arranged on the same circumference. It should be noted that, in the following description, the first protrusions 331 and second protrusions 332 are collectively referred to as protrusions 331 and 332. The protrusions 331 and 332 protrude in the axial direction.

[0064] The first protrusion 331 protrudes toward the first friction material 35a. That is, the first protrusion 331 protrudes toward the first side in the axial direction. The first protrusion 331 engages with the first through hole 351a of the first friction material 35a, which will be described later.

[0065] The second protrusion 332 protrudes toward the second friction material 35b. That is, the second protrusion 332 protrudes toward the second side in the axial direction. The second protrusion 332 engages with the second through hole 351b of the second friction material 35b, which will be described later.

[0066] like Figure 3 As shown, the support plate 33 has a plurality of first regions 333, a plurality of second regions 334, and a plurality of third regions 336. The first region 333 is defined by a pair of circumferentially adjacent engaging slits 335. A first protrusion 331 is formed in the first region 333. That is, the region between a pair of circumferentially adjacent engaging slits 335, where the first protrusion 331 is formed, is the first region 333.

[0067] Figure 4 This is a cross-sectional view of the torque limiter 3 before assembly. Figure 5 This is a cross-sectional view of the assembled torque limiter 3. (See attached image.) Figure 4 As shown, in the state before assembling the torque limiter 3, that is, before applying an axial load to the support plate 33, the first region 333 bends toward the first friction material 35a. That is, the first region 333 bends toward the first axial side. Therefore, it is easier to fit the first protrusion 331 of the support plate 33 into the first through hole 351a of the first friction material 35a.

[0068] like Figure 5 As shown, if the torque limiter 3 is assembled, that is, if the first side plate 31 is fastened to the second side plate 32 by a plurality of rivets 102, the support plate 33 containing the first region 333 is clamped by the second side plate 32 and the pressure plate 36. As a result, an axial load is applied to the support plate 33 containing the first region 333, and the first region 333, which is bent in the axial direction, extends in a straight line in the radial direction.

[0069] like Figure 3 As shown, the second region 334 is defined by a pair of circumferentially adjacent engaging slits 335. A second protrusion 332 is formed in the second region 334. That is, the region between the pair of circumferentially adjacent engaging slits 335, in which the second protrusion 332 is formed, is the second region 334.

[0070] The first region 333 and the second region 334 are arranged alternately in the circumferential direction. The third region 336 is located between the first region 333 and the second region 334. In the region between a pair of engaging slits 335, only the first protrusion 331 is formed, or only the second protrusion 332 is formed, or no protrusions 331 and 332 are formed. In a region, neither the first protrusion 331 nor the second protrusion 332 is formed.

[0071] like Figure 4 As shown, in the state before assembling the torque limiter 3, that is, before applying an axial load to the support plate 33, the second region 334 bends toward the second friction material 35b. That is, the second region 334 bends toward the second axial side. Therefore, it is easier to fit the second protrusion 332 of the support plate 33 into the second through hole 351b of the second friction material 35b.

[0072] like Figure 5 As shown, if the torque limiter 3 is assembled, that is, if the first side plate 31 is fastened to the second side plate 32 by a plurality of rivets 102, the support plate 33 containing the second region 334 is clamped by the second side plate 32 and the pressure plate 36. As a result, an axial load is applied to the support plate 33 containing the second region 334, and the second region 334, which is bent in the axial direction, extends in a straight line in the radial direction.

[0073] like Figure 3 As shown, the third region 336 is circumferentially positioned between the first region 333 and the second region 334. No protrusions 331 or 332 are formed in the third region 336. The front ends of each engaging slit 335 extend circumferentially toward the third region 336.

[0074] <Auxiliary Board>

[0075] Figure 6 This is a front view showing the auxiliary plates 34 mounted on the support plate 33. (Example) Figure 6 As shown, each auxiliary plate 34 is arranged radially outward relative to the support plate 33. Each auxiliary plate 34 is mounted on the support plate 33. Each auxiliary plate 34 rotates integrally with the support plate 33.

[0076] In this embodiment, the torque limiter 3 has six auxiliary plates 34. The auxiliary plates 34 are arranged in a ring, that is, in the circumferential direction. The auxiliary plates 34 are spaced apart from each other in the circumferential direction. It should be noted that the auxiliary plates 34 can also be in contact with each other.

[0077] Figure 7 This is the main view of auxiliary plate 34. (Example) Figure 7 As shown, the auxiliary plate 34 has a main body 342 and a plurality of engaging tabs 343. It should be noted that in this embodiment, the auxiliary plate 34 has four engaging tabs 343. The main body 342 extends circumferentially. The main body 342 is arc-shaped with the rotation axis O as its center.

[0078] Engaging tabs 343 extend radially inward from the main body 342 of the plate. The engaging tabs 343 are spaced apart from each other in the circumferential direction. The engaging tabs 343 engage with engaging slits 335. The engaging tabs 343 and engaging slits 335 extend in the same direction. The shape of the engaging tabs 343 is substantially the same as the shape of the engaging slits 335. The auxiliary plate 34 is mounted on the support plate 33 by engaging the engaging tabs 343 with the engaging slits 335.

[0079] The engaging tab 343 is configured to hook into the engaging slit 335. Therefore, even if the power transmission device 100 rotates and applies centrifugal force to the auxiliary plate 34, the engaging tab 343 hooks into the inner wall of the engaging slit 335, thereby restricting the auxiliary plate 34 from moving radially outward and preventing the auxiliary plate 34 from falling off the support plate 33.

[0080] In detail, the auxiliary plate 34 has at least one pair of engaging tabs 343. It should be noted that in this embodiment, the auxiliary plate 34 has four engaging tabs 343. That is, the auxiliary plate 34 has two pairs of engaging tabs 343.

[0081] Each locking tab 343 has an extension 344 and a hook portion 345. The extension 344 extends radially inward from the plate body portion 342. That is, the extension 344 is the radially extending portion of the locking tab 343. The extension 344 extends toward the rotation axis O.

[0082] The hook portion 345 extends circumferentially from the extension portion 344. That is, the hook portion 345 is the portion of the engaging piece 343 that extends circumferentially. The hook portion 345 extends circumferentially from the front end of the extension portion 344. In a pair of adjacent engaging pieces 343 in the circumferential direction, the hook portions 345 of each pair extend circumferentially towards each other. It should be noted that the adjacent pairs of hook portions 345 are arranged at intervals from each other in the circumferential direction.

[0083] A pair of locking tabs 343 are configured to clamp the center of gravity G of the auxiliary plate 34 in the circumferential direction by another pair of locking tabs 343. This makes it more reliable to prevent the auxiliary plate 34 from moving radially outward and falling off the support plate 33.

[0084] like Figure 6 As shown, a pair of engaging tabs 343 are circumferentially disposed between a pair of protrusions 331 and 332. More specifically, the pair of engaging tabs 343 formed by the hook portions 345 facing each other are circumferentially disposed between the first protrusion 331 and the second protrusion 332. It should be noted that the protrusions 331 and 332 are not disposed between the pair of engaging tabs 343 formed by the hook portions 345 facing each other.

[0085] Friction Materials

[0086] like Figure 2 As shown, the first friction material 35a is axially disposed between the support plate 33 and the disc spring 37. More specifically, the first friction material 35a is axially disposed between the support plate 33 and the pressure plate 36. The first friction material 35a is axially adjacent to the support plate 33 and the auxiliary plate 34.

[0087] The first friction material 35a has a first through hole 351a. The first through hole 351a axially passes through the first friction material 35a. The first friction material 35a is mounted on the support plate 33. Specifically, the first friction material 35a is mounted on the support plate 33 by engaging with the first through hole 351a of the first friction material 35a through a first protrusion 331 of the support plate 33. The first friction material 35a rotates integrally with the support plate 33.

[0088] The first friction material 35a is annular. The first friction material 35a extends across the support plate 33 and the auxiliary plate 34. That is, the first friction material 35a overlaps with both the support plate 33 and the auxiliary plate 34 when viewed axially. The inner diameter of the first friction material 35a is smaller than the outer diameter of the support plate 33. The outer diameter of the first friction material 35a is larger than the outer diameter of the support plate 33. Furthermore, the outer diameter of the first friction material 35a is less than or equal to the outer diameter of the auxiliary plate 34. It should be noted that in this embodiment, the outer diameter of the first friction material 35a is substantially the same as the outer diameter of the auxiliary plate 34. Additionally, the outer diameter of the auxiliary plate 34 refers to the length from the rotation axis O to the outer periphery of the auxiliary plate 34.

[0089] Figure 8 This is a front view of the first friction material 35a as viewed from the second side along the axial direction. Figure 9 yes Figure 8 The IX-IX vector view. (e.g.) Figure 8 as well as Figure 9 As shown, the first friction material 35a has a plurality of grooves 352a. The grooves 352a are spaced apart from each other in the circumferential direction. Each groove 352a is arranged with each engaging tab 343 at the same spacing. The width of the groove 352a is greater than the width of the engaging tab 343. Specifically, the width of the groove 352a is greater than the width of the extension 344 of the engaging tab 343. Here, the width of the groove 352a and the engaging tab 343 refers to the circumferential dimension. Each groove 352a extends radially. Each groove 352a opens radially outward.

[0090] Each groove 352a is formed on one of the two surfaces of the first friction material 35a, on the surface that contacts the support plate 33 and the auxiliary plate 34. That is, each groove 352a is formed on the second axially facing surface of the first friction material 35a. Each groove 352a does not penetrate the first friction material 35a axially.

[0091] Figure 10 This is an enlarged front view of the support plate 33 on which the auxiliary plate 34 and the first friction material 35a are mounted. Figure 10 As shown, the groove 352a overlaps with the boundary of the engaging slit 335 and the engaging tab 343 when viewed axially. Therefore, if water accumulates in the gap between the engaging slit 335 and the engaging tab 343, the water can be discharged to the outside through the groove 352a. Preferably, the groove 352a overlaps with the root of the engaging tab 343 when viewed axially.

[0092] like Figure 2As shown, the second friction material 35b is axially disposed between the support plate 33 and the second side plate 32. The second friction material 35b is axially adjacent to the support plate 33 and the auxiliary plate 34. The second friction material 35b has the same configuration as the first friction material 35a. That is, the second friction material 35b has a plurality of second through holes 351b and a plurality of grooves (not shown). It should be noted that the second friction material 35b may also not have grooves.

[0093] The second through hole 351b axially penetrates the second friction material 35b. The second friction material 35b is mounted on the support plate 33. Specifically, the second friction material 35b is mounted on the support plate 33 by engaging with the second through hole 351b of the second friction material 35b through the second protrusion 332 of the support plate 33. The second friction material 35b rotates integrally with the support plate 33.

[0094] The second friction material 35b is annular. The second friction material 35b extends across the support plate 33 and the auxiliary plate 34. That is, when viewed axially, the second friction material 35b overlaps with both the support plate 33 and the auxiliary plate 34. The inner diameter of the second friction material 35b is smaller than the outer diameter of the support plate 33. The outer diameter of the second friction material 35b is larger than the outer diameter of the support plate 33. Furthermore, the outer diameter of the second friction material 35b is less than or equal to the outer diameter of the auxiliary plate 34. It should be noted that, in this embodiment, the outer diameter of the second friction material 35b is substantially the same as the outer diameter of the auxiliary plate 34.

[0095] <Pressure plate>

[0096] The pressure plate 36 is annular. It is axially positioned between the disc spring 37 and the support plate 33. More specifically, the pressure plate 36 is axially positioned between the first friction material 35a and the disc spring 37. The inner diameter of the pressure plate 36 is smaller than the inner diameter of the first friction material 35a. Furthermore, the outer diameter of the pressure plate 36 is larger than the outer diameter of the first friction material 35a. That is, the pressure plate 36 can press against the entire surface of the first friction material 35a.

[0097] The pressure plate 36 is configured to rotate integrally with the second side plate 32. It should be noted that the pressure plate 36 is capable of moving axially relative to the second side plate 32.

[0098] <Disc Spring>

[0099] A disc spring 37 is axially disposed between the support plate 33 and the first side plate 31. More specifically, the disc spring 37 is axially disposed between the first side plate 31 and the pressure plate 36. The disc spring 37 exerts force on the pressure plate 36 towards a second axial direction. That is, the disc spring 37 exerts force on the pressure plate 36 towards the support plate 33. Thus, the support plate 33, the first friction material 35a, and the second friction material 35b are clamped together by the pressure plate 36 and the second side plate 32.

[0100] Disc spring 37 is ring-shaped. For example... Figure 11 As shown, the disc spring 37 and the support plate 33 are taken from the same plate. Therefore, the inner diameter of the disc spring 37 is greater than the outer diameter of the support plate 33. In addition, the thickness of the disc spring 37 is the same as the thickness of the support plate 33.

[0101] In addition to the disc spring 37 and the support plate 33, multiple auxiliary plates 34 are also taken from a single plate. Multiple auxiliary plates 34 are taken from the area enclosed by the support plate 33. Therefore, the thickness of each auxiliary plate 34 is the same as the thickness of the support plate 33. Figure 11 This is a top view showing a plate with the support plate 33, disc spring 37 and multiple auxiliary plates 34 removed.

[0102] like Figure 2 As shown, the disc spring 37 abuts against the first side plate 31 at its outer peripheral end and against the pressure plate 36 at its inner peripheral end. The inner peripheral edge of the disc spring 37 is arranged radially outward relative to the outer peripheral edge of the support plate 33. Furthermore, the inner peripheral edge of the disc spring 37 is arranged radially inward relative to the outer peripheral edge of the auxiliary plate 34. That is, the disc spring 37 overlaps with the auxiliary plate 34 when viewed axially. Therefore, a uniform load can be applied to the first friction material 35a.

[0103] [Variation Example]

[0104] The embodiments of the present invention have been described above, but the present invention is not limited thereto, and various modifications can be made as long as they do not depart from the spirit of the present invention. It should be noted that the following variations can be applied simultaneously.

[0105] (a) In the above embodiment, the latching tab 343 has an extension 344 and a hook portion 345, but the configuration of the latching tab 343 is not limited thereto. For example, such as Figure 12 As shown, the latching piece 343 may also have an extension 344, a first hook portion 345, and a second hook portion 346. The first hook portion 345 and the second hook portion 346 extend circumferentially from the extension 344. The first hook portion 345 and the second hook portion 346 extend on opposite sides of each other.

[0106] (b) The latching piece 343 may also be shaped like a portion that gradually increases in width toward the radially inward side. For example, the latching piece 343 may be as follows: Figure 13 The image shown is a teardrop shape, but it can also be like... Figure 14 The diagram shows a triangular shape. It should be noted that the width of the snap-fit ​​piece 343 refers to its circumferential dimension.

[0107] (c) In the above embodiment, the first friction material 35a has a groove 352a, but the first friction material 35a may also not have a groove 352a.

[0108] (d) The first friction material 35a and the second friction material 35b may also be installed on the auxiliary plate 34 instead of the support plate 33. Alternatively, the first friction material 35a and the second friction material 35b may also be installed on the support plate 33 or the auxiliary plate 34 by other methods such as adhesives.

Claims

1. A torque limiter, characterized in that, have: The first side plate is annular; An annular support plate is arranged axially spaced from the first side plate; Multiple auxiliary plates are mounted on the support plate and arranged radially outward relative to the support plate, the multiple auxiliary plates being arranged in a ring; A disc spring is axially disposed between the support plate and the first side plate; as well as A first friction material is disposed axially between the support plate and the disc spring, and is adjacent to the support plate and each of the auxiliary plates. The support plate has a plurality of engaging slits extending radially inward from the outer periphery. Each of the aforementioned auxiliary plates has: The main body of the board extends circumferentially; as well as The engaging tab extends radially inward from the main body of the plate and engages with the engaging slit. The engaging tab is configured to hook within the engaging slit to restrict the auxiliary plate from moving radially outward.

2. The torque limiter according to claim 1, characterized in that, The locking tab has: An extension extends radially inward from the main body of the plate; and The hook portion extends circumferentially from the extension portion.

3. The torque limiter according to claim 2, characterized in that, The auxiliary plate has a pair of engaging tabs. The hook portions of each of the aforementioned locking pieces extend circumferentially toward each other.

4. The torque limiter according to claim 3, characterized in that, The support plate has a pair of protrusions that project axially. The pair of latching tabs are arranged circumferentially between the pair of protrusions.

5. The torque limiter according to claim 1, characterized in that, The first friction material has a groove that opens radially outward on the surface that contacts the support plate and each of the auxiliary plates. When viewed axially, the groove overlaps with the boundaries of the engaging slit and the engaging piece.

6. The torque limiter according to claim 1, characterized in that, The torque limiter also features: The annular second side plate is configured such that the support plate, each of the auxiliary plates, the disc spring, and the first friction material are disposed between the second side plate and the first side plate; A pressure plate is axially disposed between the disc spring and the first friction material; as well as A second friction material is disposed axially between the support plate and the second side plate.

7. The torque limiter according to claim 1, characterized in that, The torque limiter also features: The annular second side plate is configured such that the support plate, each of the auxiliary plates, the disc spring, and the first friction material are disposed between the second side plate and the first side plate; A pressure plate is axially disposed between the disc spring and the first friction material; as well as A second friction material is disposed axially between the support plate and the second side plate. The first friction material has a first through hole extending in the axial direction. The second friction material has a second through hole extending in the axial direction. The support plate has: The first protrusion protrudes toward the first friction material side and engages with the first through hole; The second protrusion protrudes toward the second friction material side and engages with the second through hole; The first region is defined by a pair of circumferentially adjacent engaging slits and has the first protrusion formed thereon; as well as The second region is defined by a pair of circumferentially adjacent engaging slits and has the second protrusion thereon. The portion of the first region that bends toward the first friction material extends in a straight line by being clamped between the pressure plate and the second side plate. The portion of the second region that bends toward the second friction material extends in a straight line by being clamped between the pressure plate and the second side plate.

8. The torque limiter according to claim 1, characterized in that, The inner periphery of the disc spring is arranged radially outward relative to the outer periphery of the support plate, and radially inward relative to the outer periphery of each of the auxiliary plates.

9. The torque limiter according to claim 1, characterized in that, The disc spring has the same thickness as the support plate.

10. A power transmission device, characterized in that, have: The torque limiter according to any one of claims 1 to 9; and The vibration damping unit has an input rotating body, an output rotating body configured to rotate integrally with the support plate, and an elastic member that elastically connects the input rotating body and the output rotating body.

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