Power transmission device

Abstract

To increase an amount of inertia of a flywheel.SOLUTION: A power transmission device 100 comprises a flywheel 10 and a damper device 30. The flywheel 10 has a body part 11, an attachment part 12, and a first protruding part 13. The attachment part 12 is positioned radially outside of the body part 11. The first protruding part 13 is positioned radially outside of the attachment part 12. The first salient part 13 protrudes to an axially first side of the attachment part 12. The damper device 30 is positioned on an axially first side of the body part 11. The damper device 30 is attached to the attachment part 12.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a power transmission device.

Background Art

[0002] A power transmission device is configured to absorb torque fluctuations of an engine. This power transmission device has a flywheel and a damper device.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In order to absorb more torque fluctuations, it is desired to increase the inertia amount of the flywheel. Therefore, an object of the present invention is to provide a power transmission device capable of increasing the inertia amount of the flywheel.

Means for Solving the Problems

[0005] The power transmission device according to the first aspect includes a flywheel and a damper device. The flywheel has a main body portion, a mounting portion, and a first protruding portion. The mounting portion is disposed radially outside the main body portion. The first protruding portion is disposed radially outside the mounting portion. The first protruding portion protrudes axially on a first side with respect to the mounting portion. The damper device is disposed axially on a first side with respect to the main body portion. The damper device is attached to the mounting portion.

[0006] According to this configuration, since the flywheel has the first protruding portion that protrudes axially on the first side on the radially outer side of the mounting portion to which the damper device is attached, the inertia amount thereof can be increased.

[0007] The power transmission device according to the second embodiment is configured as follows in the power transmission device according to the first embodiment. The first projection is an annular shape extending in the circumferential direction.

[0008] The power transmission device according to the third embodiment is configured as follows in the power transmission device according to the second embodiment: The outer diameter of the first projection decreases toward the first axial direction.

[0009] The power transmission device according to the fourth embodiment is configured as follows in the power transmission device according to any of the first to third embodiments: The first projection becomes thinner toward the first axial side.

[0010] The power transmission device according to the fifth embodiment is configured as follows in the power transmission device according to the second or third embodiment: The first projection has a first inner surface and a second inner surface. The second inner surface is positioned on the second axial side with respect to the first inner surface. The inner diameter of the second inner surface is smaller than that of the first inner surface.

[0011] The power transmission device according to the sixth embodiment is configured as follows in the power transmission device according to any of the first to fifth embodiments: The mounting portion protrudes axially in the first direction relative to the main body.

[0012] The power transmission device according to the seventh embodiment is configured as follows in the power transmission device according to any of the first to sixth embodiments: The mounting portion has a mounting surface and a groove. The mounting surface faces the first side in the axial direction. The groove is formed at the outer peripheral end of the mounting surface. The groove extends in the circumferential direction.

[0013] The power transmission device according to the eighth embodiment is configured as follows in the power transmission device according to any of the first to seventh embodiments: The flywheel has a second projection. The second projection is positioned radially outward from the mounting portion. The second projection protrudes axially second from the mounting portion.

[0014] The power transmission device according to the ninth embodiment is configured as follows in the power transmission device according to any of the first to eighth embodiments: The damper device has a damper unit and a torque limiter unit. The damper unit is configured to absorb torque fluctuations. The torque limiter unit is configured to restrict the transmission of torque above a predetermined value. The torque limiter unit is positioned radially outward from the damper unit. The torque limiter unit is attached to a mounting portion.

[0015] The power transmission device according to the tenth embodiment is configured as follows in the power transmission device according to the ninth embodiment. The damper unit has a first input plate, a second input plate, a first fastening portion, an output plate, and an elastic member. The second input plate is positioned on the second axial side relative to the first input plate. The second input plate rotates integrally with the first input plate. The first fastening portion fastens the first input plate and the second input plate. The elastic member elastically connects the output plate to the first and second input plates. In an axial view, the first fastening portion overlaps with the torque limiter unit.

[0016] The power transmission device according to the 11th embodiment is configured as follows in the power transmission device according to the 10th embodiment: The torque limiter unit has a friction plate and a second fastening portion. The second fastening portion fastens the friction plate to the first input plate or the second input plate. The second fastening portion is positioned radially inward from the first fastening portion.

[0017] The power transmission device according to the 12th aspect is configured as follows in the power transmission device according to the 10th or 11th aspect. The torque limiter unit has a first side plate, a second side plate, a friction plate, and a first friction material. The first side plate is annular. The second side plate is disposed on the second side in the axial direction with respect to the first side plate. The second side plate is annular. The friction plate rotates integrally with the first and second input plates. The first friction material is disposed between the friction plate and the first side plate. The tip surface of the first protrusion is located on the first side in the axial direction with respect to the first side plate.

[0018] The power transmission device according to the 13th aspect is configured as follows in the power transmission device according to the 12th aspect. The outer peripheral end portion of the first input plate is disposed on the first side in the axial direction with respect to the inner peripheral end portion of the first side plate. The outer diameter of the first input plate is larger than the inner diameter of the first side plate. The first fastening portion is disposed on the first side in the axial direction with respect to the first side plate.

Advantages of the Invention

[0019] According to the present invention, the inertia amount of the flywheel can be increased.

Brief Description of the Drawings

[0020] [Figure 1] Front view of the power transmission device. [Figure 2] Cross-sectional view taken along line II-II of FIG. 1. [Figure 3] Enlarged cross-sectional view of the flywheel. [Figure 4] Enlarged cross-sectional view of the torque limiter unit. [Figure 5] Enlarged cross-sectional view of the torque limiter unit. [Figure 6] [[ID=3,4]]Cross-sectional view of the damper unit. [Figure 7] Front view of the second input plate. [Figure 8] Front view of the spline hub.

Best Mode for Carrying Out the Invention

[0021] [Overall Configuration] FIG. 1 is a front view of a power transmission device 100 according to the present embodiment, and FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1. In FIG. 2, the line O-O is the rotation axis of the power transmission device 100. In FIG. 2, an engine is arranged on the left side of the power transmission device 100, and a drive unit including an electric motor, a transmission, and the like is arranged on the right side.

[0022] In the following description, the axial direction is the direction in which the rotation axis O of the power transmission device 100 extends. The first axial side means the side on which the first protrusion 13 described later protrudes, and the second axial side means the opposite side of the first axial side. Specifically, the first axial side means the right side in FIG. 2, and the second axial side means the left side in FIG. 2. That is, in the present embodiment, the first axial side means the output side, and the second axial side means the input side. Also, the circumferential direction is the circumferential direction of a circle centered on the rotation axis O, and the radial direction is the radial direction of a circle centered on the rotation axis O. Note that the circumferential direction does not have to completely coincide with the circumferential direction of a circle centered on the rotation axis O, and the radial direction does not have to completely coincide with the diameter direction of a circle centered on the rotation axis O.

[0023] As shown in FIGS. 1 and 2, the power transmission device 100 has a flywheel 10 and a damper device 30. The flywheel 10 and the damper device 30 basically rotate integrally with each other.

[0024] [Flywheel] The flywheel 10 is rotatably positioned around the rotation axis O. The flywheel 10 has a main body 11, a mounting portion 12, a first projection 13, and a second projection 14. The main body 11, mounting portion 12, first projection 13, and second projection 14 are integrally constructed as a single component. However, the main body 11 may be constructed as a separate component from the mounting portion 12, the first projection 13, and the second projection 14. In this case, the main body 11 can be a flexible plate. Furthermore, the flywheel 10 does not necessarily have the second projection 14.

[0025] The main body portion 11 is disc-shaped. The mounting portion 12 is positioned radially outward relative to the main body portion 11. The mounting portion 12 is annular in shape and extends in the circumferential direction. The mounting portion 12 protrudes axially in the first direction relative to the main body portion 11.

[0026] As shown in Figure 3, the mounting portion 12 has a mounting surface 121. The mounting surface 121 is a surface facing the first axial direction. In an axial view, the mounting surface 121 is annular. The mounting portion 12 has a plurality of screw holes 122 on the mounting surface 121. The plurality of screw holes 122 are arranged in the circumferential direction. The mounting portion 12 also has a plurality of knock pins (not shown). The plurality of knock pins are arranged in the circumferential direction. The knock pins protrude from the mounting surface 121 in the first axial direction. By inserting these knock pins into knock pin holes formed on the outer circumference of the damper device, the damper device 30 is positioned relative to the flywheel 10.

[0027] The mounting portion 12 has a groove 123 at the outer peripheral end of the mounting surface 121. The groove 123 extends in the circumferential direction. When viewed from the first axial side, the groove 123 is annular.

[0028] The first projection 13 is positioned radially outward from the mounting portion 12. The first projection 13 is an annular shape extending in the circumferential direction. The first projection 13 protrudes axially in the first direction relative to the mounting portion 12. That is, the tip surface 130 of the first projection 13 is located axially in the first direction relative to the mounting surface 121 of the mounting portion 12. The tip surface 130 of the first projection 13 faces axially in the first direction.

[0029] The thickness t of the first projection 13 gradually decreases toward the first axial direction. The outer diameter of the first projection 13 gradually decreases toward the first axial direction. However, the outer diameter of the first projection 13 may remain constant.

[0030] The first projection 13 has a first inner circumferential surface 131 and a second inner circumferential surface 132. The second inner circumferential surface 132 is positioned on the second axial side relative to the first inner circumferential surface 131. The inner diameter of the second inner circumferential surface 132 is smaller than that of the first inner circumferential surface 131. The second inner circumferential surface 132 is in contact with the outer circumferential surface of the damper device 30. The first inner circumferential surface 131 is positioned radially apart from the damper device 30.

[0031] The second projection 14 is positioned radially outward from the mounting portion 12. The second projection 14 is annular in shape and extends in the circumferential direction. The second projection 14 protrudes axially in the second direction relative to the mounting portion 12. That is, the second projection 14 protrudes on the opposite side from the first projection 13. The tip surface 141 of the second projection 14 is located axially in the second direction relative to the main body portion 11. The tip surface 141 of the second projection 14 faces axially in the second direction.

[0032] The outer diameter of the second projection 14 gradually decreases toward the first axial direction. The outer diameter of the flywheel 10 also gradually decreases toward the first axial direction. Furthermore, the inner diameter of the second projection 14 gradually decreases toward the first axial direction.

[0033] [Damper device] As shown in Figures 1 and 2, the damper device 30 is installed between the flywheel 10 and the input shaft 111 of the drive unit. The damper device 30 is configured to limit the torque transmitted between the engine and the drive unit and to dampen rotational fluctuations.

[0034] The damper device 30 is positioned on the first axial side relative to the flywheel 10. More specifically, the damper device 30 is positioned on the first axial side relative to the main body 11.

[0035] The damper device 30 is attached to the flywheel 10. More specifically, the damper device 30 is attached to the mounting portion 12 of the flywheel 10 at its outer peripheral end. The damper device 30 is positioned radially inward with respect to the first projection 13. The damper device 30 comprises a damper unit 2 and a torque limiter unit 5.

[0036] [Torque Limiter Unit 5] The torque limiter unit 5 is configured to be attached to the flywheel 10. More specifically, the torque limiter unit 5 is attached to the mounting portion 12 of the flywheel 10 on its outer circumference.

[0037] The torque limiter unit 5 is positioned radially outward relative to the damper unit 2. The torque limiter unit 5 is configured to limit the torque transmitted between the flywheel 10 and the damper unit 2. In other words, the torque limiter unit 5 is configured to restrict the transmission of torque exceeding a predetermined value.

[0038] As shown in Figures 4 and 5, the torque limiter unit 5 includes a first side plate 51, a second side plate 52, a pressure plate 53, a cone spring 54, a first friction material 55a, a second friction material 55b, a friction plate 56, and a second fastening portion 57.

[0039] <First side plate> The first side plate 51 is annular in shape. The first side plate 51 is attached to the mounting portion 12 of the flywheel 10. Therefore, torque is transmitted from the flywheel 10 to the first side plate 51. The first side plate 51 is attached to the mounting portion 12 at its outer circumference. The first side plate 51 is also attached by bolts 102. The inner circumferential surface of the first projection 13 faces the bolts 102.

[0040] The outer circumferential surface of the first side plate 51 faces the inner circumferential surface of the first projection 13. The outer circumferential surface of the first side plate 51 is in contact with the second inner circumferential surface 132 of the first projection 13. The outer circumferential surface of the first side plate 51 is spaced apart from the first inner circumferential surface 131 of the first projection 13. The tip surface 130 of the first projection 13 is located on the first axial side relative to the first side plate 51.

[0041] <Second side plate> The second side plate 52 is annular in shape. The second side plate 52 is positioned on the second axial side relative to the first side plate 51. The second side plate 52 is attached to the mounting portion 12 of the flywheel 10 together with the first side plate 51. The second side plate 52 may also be fixed to the first side plate 51 by rivets (not shown) or the like. In this case, the second side plate 52 does not have to be attached to the flywheel 10.

[0042] The outer circumferential surface of the second side plate 52 faces the inner circumferential surface of the first projection 13. The outer circumferential surface of the second side plate 52 is in contact with the second inner circumferential surface 132 of the first projection 13. However, the outer circumferential surface of the second side plate 52 does not necessarily have to be in contact with the second inner circumferential surface 132 of the first projection 13.

[0043] The second side plate 52 is positioned at an axial distance from the first side plate 51. More specifically, the second side plate 52 has an outer circumference 521 and an inner circumference 522. The inner circumference 522 of the second side plate 52 is positioned at an axial distance from the first side plate 51. The outer circumference 521 of the second side plate 52 is in contact with the outer circumference of the first side plate 51. The outer circumference 521 of the second side plate 52 is attached to the mounting portion 12 of the flywheel 10.

[0044] The inner diameter of the second side plate 52 is larger than the inner diameter of the first side plate 51. The thickness of the second side plate 52 is thinner than the thickness of the first side plate 51.

[0045] <Friction Plate> The friction plate 56 is annular. The friction plate 56 is configured to rotate integrally with the first and second input plates 21 and 22. The friction plate 56 is positioned on the second axial side of the second input plate 22. The friction plate 56 is thinner than the second input plate 22. In the axial direction, the friction plate 56 is positioned between the first side plate 51 and the second side plate 52.

[0046] <Second fastening part> The second fastening portion 57 fastens the friction plate 56 to the damper unit 2. More specifically, the second fastening portion 57 fastens the friction plate 56 to the second input plate 22. The second fastening portion 57 may also fasten the friction plate 56 to the first input plate 21. The second fastening portion 57 is positioned radially inward from the first fastening portion 26, which will be described later. The second fastening portion 57 is, for example, a rivet.

[0047] <Friction material> The first and second friction materials 55a and 55b are annular. The first friction material 55a is positioned axially between the friction plate 56 and the first side plate 51. The second friction material 55b is positioned axially between the friction plate 56 and the second side plate 52. More specifically, the second friction material 55b is positioned axially between the friction plate 56 and the pressure plate 53.

[0048] The first and second friction materials 55a and 55b are attached to the friction plate 56. The first friction material 55a frictionally engages with the first side plate 51. The second friction material 55b frictionally engages with the pressure plate 53. When a torque exceeding a predetermined value is applied, the first friction material 55a slides against the first side plate 51, and the second friction material 55b slides against the pressure plate 53. As a result, the first side plate 51 and the friction plate 56 rotate relative to each other. The first friction material 55a may be fixed to the first side plate 51 and frictionally engaged with the friction plate 56. The second friction material 55b may be fixed to the pressure plate 53 and frictionally engaged with the friction plate 56.

[0049] <Pressure Plate> The pressure plate 53 is annular in shape. The pressure plate 53 is positioned axially between the first side plate 51 and the second side plate 52. More specifically, the pressure plate 53 is positioned axially between the second friction material 55b and the cone spring 54.

[0050] <Cornspring> The cone spring 54 is positioned axially between the second side plate 52 and the pressure plate 53. The cone spring 54 biases the pressure plate 53 axially toward the first side. As a result, the friction plate 56 and the first and second friction materials 55a and 55b are sandwiched between the pressure plate 53 and the first side plate 51.

[0051] [Damper Unit 2] As shown in Figure 6, the damper unit 2 includes a first input plate 21, a second input plate 22, a spline hub 23, a plurality of elastic members 24, and a plurality of first fastening parts 26. The damper unit 2 also includes a hiss generation mechanism 25. The damper unit 2 is configured to absorb torque fluctuations.

[0052] <First and Second Input Plates> The first input plate 21 and the second input plate 22 are both annular members having a central hole. The first input plate 21 has a larger outer diameter than the second input plate 22. However, the first input plate 21 may have a smaller outer diameter than the second input plate 22, or it may have the same outer diameter as the second input plate.

[0053] The first input plate 21 and the second input plate 22 are spaced apart from each other in the axial direction. The second input plate 22 is positioned on the second side in the axial direction relative to the first input plate 21. The first input plate 21 and the second input plate 22 rotate integrally with each other. Furthermore, the first input plate 21 and the second input plate 22 are immovable relative to each other in the axial direction.

[0054] The first input plate 21 has a plurality of first window portions 211. In this embodiment, the first input plate 21 has four first window portions 211. Each first window portion 211 is arranged in the circumferential direction.

[0055] The second input plate 22 has a plurality of second window portions 221. In this embodiment, the second input plate 22 has four second window portions 221. Each second window portion 221 is arranged in the circumferential direction. Each second window portion 221 is positioned to overlap with each first window portion 211 in an axial view.

[0056] As shown in Figure 1, the first input plate 21 has a first plate body 212 and a plurality of first mounting portions 213. In this embodiment, the first input plate 21 has four first mounting portions 213.

[0057] The first plate body 212 is annular in shape. The first mounting portion 213 protrudes radially outward from the outer circumferential surface of the first plate body 212. Each of the first mounting portions 213 is spaced apart in the circumferential direction.

[0058] The outer circumferential end of the first input plate 21 is positioned on the first axial side relative to the inner circumferential end of the first side plate 51. In an axial view, the outer circumferential end of the first input plate 21 overlaps with the inner circumferential end of the first side plate 51. Note that the outer circumferential end of the first input plate 21 refers to the outer circumferential end of the first plate body 212.

[0059] The outer diameter of the first input plate 21 is larger than the inner diameter of the first side plate 51. Therefore, when viewed from the first side in the axial direction, the inner periphery of the first side plate 51 is covered by the first input plate 21 and is not visible. Note that the outer diameter of the first input plate 21 refers to the outer diameter of the first plate body 212.

[0060] As shown in Figures 6 and 7, the second input plate 22 has a second plate body 222, a plurality of extensions 223, and a plurality of second mounting portions 224. In this embodiment, the second input plate 22 has four extensions 223 and four second mounting portions 224.

[0061] The second plate body 222 is annular. The extensions 223 extend from the outer circumference of the second plate body 222 toward the first axial direction. Each extension 223 is spaced apart in the circumferential direction.

[0062] The second mounting portion 224 extends radially outward from the extended portion 223. More specifically, the second mounting portion 224 extends radially outward from the first axial end of the extended portion 223. Each second mounting portion 224 is spaced apart in the circumferential direction.

[0063] The outer diameter of the second input plate 22 is smaller than the inner diameter of the first side plate 51. Also, the outer diameter of the second input plate 22 is smaller than the outer diameter of the first input plate 21. However, the outer diameter of the second input plate 22 may be larger than the outer diameter of the first input plate 21, or it may be the same as the outer diameter of the first input plate 21. Here, the outer diameter of the second input plate 22 refers to the outer diameter of the second plate body 222.

[0064] <1st fastening part> The first fastening portion 26 fastens the first input plate 21 and the second input plate 22. More specifically, the first fastening portion 26 fastens the first mounting portion 213 of the first input plate 21 and the second mounting portion 224 of the second input plate 22. The first fastening portion 26 is, for example, a rivet.

[0065] The first fastening portion 26 is positioned on the first axial side of the first side plate 51. Furthermore, the first fastening portion 26 is positioned to overlap with the first side plate 51 in an axial view.

[0066] <Spline Hub 23> As shown in Figures 6 and 8, the spline hub 23 is configured to transmit torque from the first and second input plates 21 and 22 to the output device. The spline hub 23 has a boss portion 231, a flange portion 232 (an example of an output plate), and a plurality of housing holes 233. The boss portion 231 and the flange portion 232 are integrally formed from a single component, but they may be formed from separate components.

[0067] The boss portion 231 is cylindrical and is positioned within the central holes of the first input plate 21 and the second input plate 22. A spline hole extending in the axial direction is formed on the inner circumference of the boss portion 231. The input shaft 111, which is the output-side member, can be spline-engaged into this spline hole.

[0068] The flange portion 232 extends radially from the outer circumferential surface of the boss portion 231. The flange portion 232 is formed in an annular shape. In the axial direction, the flange portion 232 is positioned between the first input plate 21 and the second input plate 22. The flange portion 232 is positioned on the first axial side of the first side plate 51.

[0069] The accommodating holes 233 are formed in the flange portion 232. In this embodiment, there are four accommodating holes 233. Each accommodating hole 233 is arranged in the circumferential direction. Each accommodating hole 233 is positioned to overlap with each first window portion 211 and each second window portion 221 in an axial view.

[0070] The spline hub 23 has a plurality of stopper portions 234. In this embodiment, the spline hub 23 has four stopper portions 234. The stopper portions 234 protrude radially outward from the outer circumferential surface of the flange portion 232. The extension portion 223 of the second input plate 22 abuts against these stopper portions 234, thereby restricting the relative rotation of the first and second input plates 21 and 22 with respect to the spline hub 23.

[0071] <Elastic material> As shown in Figures 1 and 6, the elastic member 24 is configured to elastically connect the first and second input plates 21 and 22 and the flange portion 232 in the rotational direction. The elastic member 24 is, for example, a coil spring.

[0072] The elastic member 24 is housed in the housing hole 233 of the flange portion 232. The elastic member 24 is also housed in the first window portion 211 of the first input plate 21 and in the second window portion 221 of the second input plate 22.

[0073] <Hiss generation mechanism> The hysteresis generation mechanism 25 is configured to generate hysteresis torque when the first and second input plates 21 and 22 and the spline hub 23 rotate relative to each other.

[0074] [Operation] The torque transmitted from the engine to the flywheel 10 is input to the damper unit 2 via the torque limiter unit 5. In the damper unit 2, torque is input to the first and second input plates 21 and 22, and this torque is transmitted to the spline hub 23 via the elastic member 24. From the spline hub 23, power is transmitted via the input shaft 111 to the output side electric motor, generator, or transmission, etc.

[0075] Furthermore, for example, when starting the engine, excessive torque may be transmitted from the output side to the engine. In such cases, the torque limiter unit 5 limits the torque transmitted to the engine to below a predetermined value.

[0076] [Differentiation] The present invention is not limited to the embodiments described above, and various modifications or alterations are possible without departing from the scope of the invention. Furthermore, the following modifications can be applied simultaneously.

[0077] (a) In the above embodiment, the first projection 13 extends continuously in the circumferential direction, but the shape of the first projection 13 is not limited thereto. For example, the first projection 13 may extend intermittently in the circumferential direction.

[0078] (b) In the above embodiment, the mounting portion 12 protruded axially in the first direction relative to the main body portion 11, but the configuration of the mounting portion 12 is not limited to this. That is, the mounting portion 12 does not have to protrude axially in the first direction relative to the main body portion 11. [Explanation of Symbols]

[0079] 2: Damper Unit 21: First input plate 22: Second input plate 24: Elastic member 26: 1st fastening part 5: Torque Limiter Unit 51: First side plate 52: Second side plate 55a: 1st friction material 56: Friction Plate 57:Second fastening part 10: Flywheel 11: Main body 12: Mounting part 121: Mounting surface 123: Groove 13:First protrusion 130:Tip surface 131: First inner peripheral surface 132: 2nd inner peripheral surface 14:Second protrusion 30: Damper device 100: Power transmission device

Claims

1. A flywheel having a main body, a mounting portion positioned radially outward from the main body, and a first projection positioned radially outward from the mounting portion and projecting axially to the first side relative to the mounting portion, A damper device is positioned on the first axial side with respect to the main body and attached to the mounting portion, Equipped with, The damper device is A damper unit configured to absorb torque fluctuations, A torque limiter unit configured to restrict the transmission of torque exceeding a predetermined value, It has, The torque limiter unit is positioned radially outward from the damper unit and is attached to the mounting portion. The damper unit is, First input plate and A second input plate is positioned on the second axial side of the first input plate and rotates integrally with the first input plate, A first fastening portion that fastens the first input plate and the second input plate, Output plate and, An elastic member that elastically connects the output plate and the first and second input plates, It has, The first fastening portion overlaps with the torque limiter unit in an axial view. Power transmission device.

2. The first projection is an annular shape extending in the circumferential direction. The power transmission device according to claim 1.

3. The first projection has an outer diameter that decreases toward the first axial direction. The power transmission device according to claim 2.

4. The first protrusion becomes thinner toward the first axial direction. The power transmission device according to claim 1.

5. The first protrusion is, The first inner surface and, A second inner surface is positioned on the second axial side with respect to the first inner surface, and has a smaller inner diameter than the first inner surface. Having, The power transmission device according to claim 2.

6. The mounting portion protrudes axially in the first direction relative to the main body. The power transmission device according to claim 1.

7. The aforementioned mounting portion is A mounting surface facing the first side in the axial direction, A groove is formed at the outer peripheral end of the mounting surface and extends in the circumferential direction, Having, The power transmission device according to claim 1.

8. The aforementioned flywheel is A second projection is positioned radially outward from the mounting portion and protrudes axially to the second side relative to the mounting portion. Having, The power transmission device according to claim 1.

9. The torque limiter unit is, Friction plate and A second fastening portion that fastens the friction plate and the first input plate or the second input plate, It has, The second fastening portion is positioned radially inward relative to the first fastening portion. The power transmission device according to claim 1.

10. The torque limiter unit is, The annular first side plate, An annular second side plate positioned on the second axial side relative to the first side plate, A friction plate that rotates integrally with the first and second input plates, A first friction material is disposed between the friction plate and the first side plate, It has, The tip surface of the first projection is located on the first axial side with respect to the first side plate. The power transmission device according to claim 1.

11. The outer peripheral end of the first input plate is positioned on the first axial side relative to the inner peripheral end of the first side plate. The outer diameter of the first input plate is larger than the inner diameter of the first side plate. The first fastening portion is positioned on the first axial side with respect to the first side plate. The power transmission device according to claim 10.

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