Power transmission device

Abstract

To provide a power transmission device which can achieve low costs.SOLUTION: A power transmission device 100 includes a flywheel 10, a torque limiter unit 5, and a damper unit 2. The torque limiter unit 5 has: first and second side plates 51, 52; and a friction plate 56. The first side plate 51 is attached to the flywheel 10. The first side plate 51 is disposed at a first side in an axial direction relative to the flywheel 10. The friction plate 56 is disposed between the first side plate 51 and the second side plate 52 in the axial direction. The damper unit 2 has: input rotary bodies 21, 22; an output plate 232; and an elastic member 24. The output plate 232 is disposed between the first side plate 51 and the flywheel 10 in the axial direction.SELECTED DRAWING: Figure 2

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, a torque limiter unit, and a damper unit (for example, Patent Document 1). The damper unit is attached to the flywheel via the torque limiter unit. The torque limiter unit is configured to regulate the transmission of torque of a predetermined value or more between the flywheel and the damper unit.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Cost reduction of the power transmission device configured as described above is desired. Therefore, an object of the present invention is to provide a power transmission device capable of cost reduction.

Means for Solving the Problems

[0005] The power transmission device according to the first embodiment comprises a flywheel, a torque limiter unit, and a damper unit. The torque limiter unit is attached to the flywheel. The damper unit is attached to the torque limiter unit. The torque limiter unit has a first side plate, a second side plate, and a friction plate. The first side plate is attached to the flywheel. The first side plate is positioned on the first axial side relative to the flywheel. The second side plate is configured to rotate integrally with the first side plate. The second side plate is positioned on the second axial side relative to the first side plate. The friction plate is positioned between the first side plate and the second side plate in the axial direction. The damper unit comprises an input rotor, an output plate, and an elastic member. The input rotor is configured to rotate integrally with the friction plate. The output plate is positioned to rotate relative to the input rotor. The output plate is positioned between the first side plate and the flywheel in the axial direction. The elastic member elastically connects the input rotor and the output plate.

[0006] According to the configuration described above, the output plate is positioned between the first side plate and the flywheel. Therefore, the first side plate and the flywheel do not interfere with each other when they rotate relative to one another. Consequently, if the first side plate and the output plate are made from a single component, the process of machining the outer surface of the output plate can be omitted, resulting in lower costs.

[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 side plate has an outer circumference and an inner circumference. The inner circumference is positioned on the first axial side with respect to the outer circumference.

[0008] The power transmission device according to the third embodiment is configured as follows in the power transmission device according to the first or second embodiment: The flywheel has a main body and a mounting portion. The mounting portion is positioned radially outward from the main body and protrudes from the main body in the first axial direction. The first side plate is attached to the mounting portion. The output plate is positioned between the first side plate and the main body.

[0009] The power transmission device according to the fourth embodiment is configured as follows in the power transmission device according to the third embodiment: The flywheel has a projection. The projection is positioned radially outward from the mounting portion. The projection protrudes axially to the first side from the mounting portion.

[0010] The power transmission device according to the fifth embodiment is configured as follows in the power transmission device according to any of the first to fourth embodiments: The input rotating body has a first input plate and a second input plate. A friction plate is attached to the first input plate. The second input plate is positioned on the second axial side with respect to the first input plate. The second input plate is configured to rotate integrally with the first input plate.

[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 outer diameter of the output plate is the same as the inner diameter of the first side plate.

[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 friction plate is a separate component from the first input plate.

[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 first side plate is positioned so that its inner circumferential surface does not face the outer circumferential surface of the output plate. [Effects of the Invention]

[0014] According to the present invention, a power transmission device that can be manufactured at a lower cost can be provided. [Brief explanation of the drawing]

[0015] [Figure 1] Cross-sectional view of a power transmission device. [Figure 2] Cross-sectional view along line II-II in Figure 1. [Figure 3] Enlarged cross-sectional view of the torque limiter unit. [Figure 4] Front view of the flange plate. [Figure 5] Front view of a single plate on which a flange plate and a first side plate are formed. [Figure 6] Enlarged cross-sectional view of a modified flywheel. [Modes for carrying out the invention]

[0016] [Overall structure] Figure 1 is a front view of the power transmission device 100 according to this embodiment, and Figure 2 is a cross-sectional view taken along line II-II in Figure 1. In Figure 2, line OO is the rotating shaft of the power transmission device 100. In Figure 2, an engine (not shown) is located on the left side of the power transmission device 100, and a drive unit (not shown) including an electric motor and a transmission is located on the right side.

[0017] In the following explanation, the axial direction refers to the direction in which the rotation axis O of the power transmission device 100 extends. The circumferential direction refers to the circumferential direction of a circle centered on the rotation axis O, and the radial direction refers to the radial direction of a circle centered on the rotation axis O. The circumferential direction does not need to perfectly coincide with the circumferential direction of a circle centered on the rotation axis O, and the radial direction does not need to perfectly coincide with the diametrical direction of a circle centered on the rotation axis O.

[0018] As shown in FIGS. 1 and 2, the power transmission device 100 is provided between the engine and the input shaft 111 of the drive unit. The power transmission device 100 is configured to limit the torque transmitted between the engine and the drive unit and to attenuate rotational fluctuations. The power transmission device 100 includes a flywheel 10, a torque limiter unit 5, and a damper unit 2.

[0019] [Flywheel] The flywheel 10 is arranged to be rotatable about the rotation axis O. The flywheel 10 has a main body portion 11 and a mounting portion 12. The main body portion 11 and the mounting portion 12 are integrally formed with each other as one member. Note that the main body portion 11 may be configured as a separate member from the mounting portion 12. In this case, the main body portion 11 can be a flexible plate.

[0020] The main body portion 11 is disc-shaped. The mounting portion 12 is arranged radially outside the main body portion 11. The mounting portion 12 is annular and extends in the circumferential direction. The mounting portion 12 protrudes toward the first axial side with respect to the main body portion 11.

[0021] The mounting portion 12 has a mounting surface 121. The mounting surface 121 is a surface facing the first axial side. In the 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. Further, the mounting portion 12 has a plurality of knock pins (not shown). The plurality of knock pins are arranged in the circumferential direction. The knock pins protrude toward the first axial side from the mounting surface 121. By inserting this knock pin into the knock pin hole formed in the outer peripheral portion of the torque limiter unit 5, the torque limiter unit 5 is positioned with respect to the flywheel 10.

[0022] [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.

[0023] 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.

[0024] As shown in Figure 3, 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, and a friction plate 56.

[0025] <First side plate> The first side plate 51 is annular. The first side plate 51 is attached to the flywheel 10. More specifically, the first side plate 51 is attached to the mounting portion 12 of the flywheel 10. The first side plate 51 is positioned on the first axial side relative to the flywheel 10.

[0026] The first side plate 51 has an outer circumference 511 and an inner circumference 512. The inner circumference 512 of the first side plate 51 is subjected to a biasing force by a cone spring 54.

[0027] The outer periphery 511 of the first side plate 51 is configured to be attached to the flywheel 10. More specifically, the outer periphery 511 has a through hole 513 for passing a bolt (not shown) that is screwed into a screw hole 122.

[0028] The inner circumference 512 of the first side plate is positioned on the first axial side relative to the outer circumference 511. The inner circumference 512 is connected to the outer circumference 511 via a connecting portion 514 that extends in the axial direction.

[0029] <Second side plate> The second side plate 52 is configured to rotate integrally with the first side plate 51. Specifically, the second side plate 52 is fixed to the flywheel 10 together with the first side plate 51 by bolts (not shown) that are screwed into screw holes 122. The second side plate 52 is positioned on the second axial side relative to the first side plate 51.

[0030] The second side plate 52 is annular. The outer diameter of the second side plate 52 is approximately the same as the outer diameter of the first side plate 51. The inner diameter of the second side plate 52 is larger than the inner diameter of the first side plate 51.

[0031] The second side plate 52 has an outer circumference 521 and an inner circumference 522. The outer circumference 521 of the second side plate 52 is configured to be attached to the flywheel 10. In detail, the outer circumference 521 has a through hole 523 for passing a bolt (not shown) that is screwed into a screw hole 122.

[0032] The outer circumference 521 of the second side plate 52 is in contact with the outer circumference 511 of the first side plate 51. On the other hand, the inner circumference 522 of the second side plate 52 is spaced apart from the first side plate 51 in the axial direction. The thickness of the second side plate 52 is thinner than the thickness of the first side plate 51.

[0033] <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, which will be described later. In detail, the friction plate 56 is attached to the first input plate 21. The friction plate 56 is positioned on the first axial side of the first input plate 21. The friction plate 56 is thinner than the first input plate 21. In the axial direction, the friction plate 56 is positioned between the first side plate 51 and the second side plate 52.

[0034] <Second fastening part> As shown in Figure 2, 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 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.

[0035] <Friction material> As shown in Figure 3, 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.

[0036] 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.

[0037] <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.

[0038] <Cornspring> The cone spring 54 is positioned axially between the second side plate 52 and the pressure plate 53. The cone spring 54 is in contact with the inner circumference 522 of the second side plate 52. The cone spring 54 biases the pressure plate 53 toward the first side in the axial direction. 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.

[0039] [Damper Unit 2] As shown in Figure 2, the damper unit 2 is attached to the torque limiter unit 5. The damper unit 2 is configured to dampen rotational fluctuations. The damper unit 2 has a first input plate 21, a second input plate 22, a hub flange 23, and a plurality of elastic members 24. The damper unit 2 also has a hiss generation mechanism 25. The first input plate 21 and the second input plate 22 correspond to the input rotating body of the present invention.

[0040] <First and Second Input Plates> 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 relatively immovable in the axial direction. The first input plate 21 and the second input plate 22 are configured to rotate integrally with the friction plate 56. Specifically, the friction plate 56 is attached to the first input plate 21. Although the friction plate 56 is a separate component from the first input plate 21, it may also be integrally constructed with the first input plate 21 as a single component. Both the first input plate 21 and the second input plate 22 are annular components having a central hole.

[0041] 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 axial side relative to the first input plate 21. The second input plate 22 is positioned on the second axial side relative to the second side plate 52.

[0042] 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.

[0043] 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.

[0044] <1st fastening part> The first fastening portion 26 fastens the first input plate 21 and the second input plate 22. The first fastening portion 26 is, for example, a rivet. The first fastening portion 26 is positioned on the second axial side of the second side plate 52. Furthermore, the first fastening portion 26 is positioned so as to overlap with the first side plate 51 in an axial view.

[0045] <Hub flange 23> The hub flange 23 is configured to transmit torque from the first and second input plates 21 and 22 to the output device. The hub flange 23 has a hub 231 and a flange plate 232 (an example of an output plate). The hub 231 and the flange plate 232 are integrated by a plurality of teeth and a plurality of recesses into which these teeth mesh.

[0046] The hub 231 is cylindrical and is positioned within the central holes of the first input plate 21 and the second input plate 22. A splined hole extending in the axial direction is formed on the inner circumference of the hub 231. The input shaft 111, which is the output component, can be spline-engaged into this splined hole.

[0047] The flange plate 232 extends radially from the outer circumferential surface of the hub 231. The flange plate 232 is formed in an annular shape. The flange plate 232 is rotatably positioned relative to the first input plate 21 and the second input plate 22.

[0048] The flange plate 232 is positioned axially between the first input plate 21 and the second input plate 22. Furthermore, the flange plate 232 is positioned axially between the first side plate 51 and the flywheel 10. More specifically, the flange plate 232 is positioned axially between the first side plate 51 and the main body 11. That is, from the first side in the axial direction, the components are arranged in the order of the first side plate 51, the flange plate 232, and the main body 11 of the flywheel 10.

[0049] The flange plate 232 is positioned so that its outer circumferential surface does not face the inner circumferential surface of the first side plate 51. Specifically, the outer circumferential surface of the flange plate 232 is positioned on the second axial side relative to the inner circumferential surface of the first side plate 51. Therefore, the first side plate 51 and the flange plate 232 do not interfere with each other. Note that the inner circumferential surface is the surface facing inward in the radial direction, and the outer circumferential surface is the surface facing outward in the radial direction.

[0050] Figure 4 is a front view of the flange plate 232. As shown in Figure 4, the flange plate 232 is formed in a disc shape. The flange plate 232 has a central hole 235 and a plurality of accommodating holes 233. In this embodiment, the flange plate 232 has 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.

[0051] The hub 231 extends into the central hole 235 of the flange plate 232. Multiple teeth formed on the outer circumferential surface of the hub 231 engage with multiple recesses formed on the inner wall surface that define the central hole 235. As a result, the hub 231 and the flange plate 232 rotate as a single unit.

[0052] The flange plate 232 has a plurality of stopper portions 234. In this embodiment, the flange plate 232 has four stopper portions 234. The stopper portions 234 are portions that protrude radially outward. The extension portion 223 (see Figure 2) of the second input plate 22 comes into contact with these stopper portions 234, thereby restricting the relative rotation of the first and second input plates 21 and 22 with respect to the flange plate 232.

[0053] As shown in Figure 5, the outer diameter of the flange plate 232 is the same as the inner diameter of the first side plate 51. In this embodiment, the outer diameter of the flange plate 232 is the dimension from the tip of one stopper portion 234 to the tip of the other stopper portion 234 located on the opposite side. The thickness of the first side plate 51 is the same as the thickness of the flange plate 232. Therefore, the first side plate 51 and the flange plate 232 can be removed from a single plate. Furthermore, since the inner circumferential surface of the first side plate 51 and the outer circumferential surface of the flange plate 232 are positioned so as not to face each other, interference between the inner circumferential surface of the first side plate 51 and the outer circumferential surface of the flange plate 232 can be prevented without machining the outer circumferential portion of the flange plate 232. In other words, in this embodiment, the tip surface of the stopper portion 234 of the flange plate 232 does not interfere with the inner circumferential surface of the first side plate 51, even without machining the tip of the stopper portion 234 of the flange plate 232. Therefore, the process of machining the tip of the stopper portion 234 can be omitted, resulting in lower costs.

[0054] <Elastic material> As shown in Figures 1 and 2, the elastic member 24 is configured to elastically connect the first and second input plates 21 and 22 and the flange plate 232 in the rotational direction. The elastic member 24 is, for example, a coil spring.

[0055] The elastic member 24 is housed in the housing hole 233 of the flange plate 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.

[0056] [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 hub flange 23 via the elastic member 24. Power is then transmitted from the hub flange 23 to the output side motor, generator, transmission, etc.

[0057] Furthermore, for example, when starting the engine, the output side has a large amount of inertia, which can result in excessive torque being transmitted from the output side to the engine. In such cases, the torque limiter unit 5 limits the torque transmitted to the engine to a predetermined value or less.

[0058] [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 present invention.

[0059] (a) As shown in Figure 6, the flywheel 10 may have a first projection 13 (an example of a projection). The first projection 13 is positioned radially outward from the mounting portion 12. The first projection 13 is annular and extends in the circumferential direction. The first projection 13 protrudes axially in a first direction relative to the mounting portion 12. That is, the tip surface 130 of the first projection 13 is located axially in a first direction relative to the mounting surface 121 of the mounting portion 12. Note that the tip surface 130 of the first projection 13 faces axially in a first direction.

[0060] 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.

[0061] 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 torque limiter unit 5. The first inner circumferential surface 131 is positioned radially apart from the torque limiter unit 5.

[0062] The flywheel 10 may also have a second projection 14. The second projection 14 is positioned radially outward from the mounting portion 12. The second projection 14 is annular and extends in the circumferential direction. The second projection 14 protrudes axially second from 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 second from the main body portion 11. The tip surface 141 of the second projection 14 faces axially second.

[0063] 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.

[0064] Furthermore, the mounting portion 12 may have 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.

[0065] (b) In the above embodiment, the hub flange 23 is composed of two members, the hub 231 and the flange plate 232, but it may also be composed of one member. [Explanation of symbols]

[0066] 2: Damper Unit 21: First Input Plate 22: Second input plate 232: Flange Plate 24: Elastic member 5: Torque Limiter Unit 51: First side plate 511: Outer perimeter 512: Inner circumference 52: Second side plate 56: Friction Plate 10: Flywheel 11: Main body 12: Mounting part 13:First protrusion 100: Power transmission device

Claims

1. Flywheel and A torque limiter unit attached to the flywheel, A damper unit attached to the torque limiter unit, Equipped with, The torque limiter unit is, A first side plate is attached to the flywheel and positioned axially on the first side relative to the flywheel, A second side plate is configured to rotate integrally with the first side plate and is positioned on the second axial side relative to the first side plate, A friction plate positioned between the first side plate and the second side plate in the axial direction, It has, The damper unit is, An input rotating body configured to rotate integrally with the friction plate, An output plate is arranged to be rotatable relative to the input rotating body and is positioned in the axial direction between the first side plate and the flywheel, An elastic member elastically connects the input rotating body and the output plate, It has, The outer diameter of the output plate is the same as the inner diameter of the first side plate. The outer circumferential surface of the output plate does not face the inner circumferential surface of the first side plate. Power transmission device.

2. The first side plate has an outer circumference and an inner circumference that is positioned axially on the first side with respect to the outer circumference. The power transmission device according to claim 1.

3. The aforementioned flywheel is The main body and A mounting portion is positioned radially outward from the main body and protrudes axially from the main body toward the first side, It has, The first side plate is attached to the mounting portion, The output plate is positioned between the first side plate and the main body. The power transmission device according to claim 1.

4. The aforementioned flywheel is A projection is positioned radially outward from the mounting portion and protrudes axially towards the first side relative to the mounting portion. Having, The power transmission device according to claim 3.

5. The input rotating body is A first input plate to which the friction plate is attached, A second input plate is positioned on the second axial side with respect to the first input plate and is configured to rotate integrally with the first input plate, Having, The power transmission device according to claim 1.

6. The thickness of the output plate is the same as the thickness of the first side plate. The power transmission device according to claim 1.

7. The friction plate is a separate component from the first input plate. The power transmission device according to claim 1.

8. The first side plate is positioned such that its inner circumferential surface does not face the outer circumferential surface of the output plate. The power transmission device according to claim 1.

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