power transmission device

Abstract

Reduces wear on disc springs. [Solution] The power transmission device includes a first rotating member, a second rotating member, a friction member, and a disc spring. The second rotating member is arranged axially at a distance from the first rotating member. The second rotating member is arranged to be rotatable relative to the first rotating member. The friction member is arranged axially between the first rotating member and the second rotating member. The disc spring is arranged axially between the second rotating member and the friction member. The friction member has a protrusion. The protrusion protrudes toward the second rotating member. The protrusion faces the second rotating member.

Description

[Technical Field]

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

[0002] A damper device, which is an example of a power transmission device, includes an input rotary member, an output rotary member, and a plurality of elastic members (see, for example, Patent Document 1). Each elastic member elastically connects the input rotary member to the output rotary member. An input shaft of a transmission or the like is spline-fitted to the output rotary member.

[0003] In addition, to suppress resonance, the damper device has a friction member and a disc spring. The friction member and the disc spring are arranged between the input rotary member and the output rotary member. The disc spring urges the friction member toward the output rotary member. The friction member frictionally engages with the output rotary member, thereby suppressing resonance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2017-227222 Summary of the Invention [Problem to be solved by the invention]

[0005] When the power transmission device configured as described above is installed in a hybrid vehicle, the disc springs may wear out. Therefore, an object of the present invention is to suppress the wear of the disc springs. [Means for solving the problem]

[0006] A power transmission device according to a first aspect includes a first rotating member, a second rotating member, a friction member, and a disc spring. The second rotating member is arranged axially at a distance from the first rotating member. The second rotating member is arranged rotatable relative to the first rotating member. The friction member is arranged axially between the first rotating member and the second rotating member. The disc spring is arranged axially between the second rotating member and the friction member. The friction member has a protrusion. The protrusion protrudes toward the second rotating member. The protrusion faces the second rotating member.

[0007] After extensive research, the inventors discovered that when an axial load toward the second rotating member is applied to the first rotating member, the disc spring is sandwiched between the friction member and the second rotating member, causing wear to the disc spring. In contrast, in the power transmission device according to the first aspect, the friction member has a protruding portion that faces the second rotating member. Therefore, even if an axial load toward the second rotating member is applied to the first rotating member, the protruding portion abuts against the second rotating member, thereby restricting movement of the first rotating member and the friction member. As a result, wear to the disc spring caused by being sandwiched between the friction member and the second rotating member can be suppressed.

[0008] A power transmission device according to a second aspect is the power transmission device according to the first aspect, and is configured as follows: The protrusion is disposed axially at an interval from the second rotating member.

[0009] A power transmission device according to a third aspect is the power transmission device according to the second aspect, and is configured as follows: The distance between the protruding portion and the second rotary member in the axial direction is smaller than the total deflection amount of the disc spring.

[0010] A power transmission device according to a fourth aspect is the power transmission device according to the second or third aspect, and is configured as follows: The distance between the protruding portion and the second rotating member in the axial direction is equal to or greater than the plate thickness of the disc spring.

[0011] A power transmission device according to a fifth aspect is the power transmission device according to any one of the first to fourth aspects, and is configured as follows: The disc spring has a slit extending radially outward from the inner circumferential end, and the protrusion faces the second rotating member via the slit.

[0012] A power transmission device according to a sixth aspect is the power transmission device according to any one of the first to fifth aspects, and is configured as follows: the friction member has a claw portion that engages with the second rotating member, and the protrusion is disposed on the same circumference as the claw portion.

[0013] A seventh aspect of the present invention relates to the power transmission device of any one of the first to sixth aspects, and is configured as follows: the second rotating member has an annular protrusion extending in the circumferential direction. The annular protrusion protrudes toward the friction member. The protrusion faces the annular protrusion.

[0014] The power transmission device according to an eighth aspect is the power transmission device according to any one of the first to seventh aspects, and is configured as follows: The friction member has an opening in the center. The friction member has a recess that is recessed radially outward from the inner circumferential surface. The recess is arranged on an imaginary line connecting the center of the protrusion and the rotation axis when viewed in the axial direction. [Effects of the Invention]

[0015] According to the present invention, wear of the disc spring can be suppressed. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. [Figure 2] Cross-sectional view of line II-II in Figure 1. [Figure 3] FIG. [Figure 4] FIG. 3 is a front view of the damper device with the first plate removed. [Figure 5] FIG. 4 is an enlarged cross-sectional view of the damper device showing a state before activation. [Figure 6] FIG. 4 is an enlarged cross-sectional view of the damper device showing a state after activation. DETAILED DESCRIPTION OF THE INVENTION

[0017] A damper device 100 (an example of a power transmission device) according to this embodiment will be described below with reference to the drawings. In the following description, the axial direction refers to the direction in which the rotation axis O of the damper 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. In the following description, the first axial side refers to the side where the output side device is disposed (the right side in FIG. 2), and the second axial side refers to the side where the internal combustion engine is disposed (the left side in FIG. 2).

[0018] FIG. 1 is a front view of the damper device 100, and FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1. As shown in FIGS. 1 and 2, the damper device 100 is provided between an internal combustion engine (not shown) and an output side device (not shown). The output side device is, for example, a transmission or an electric motor. In this embodiment, the damper device 100 is configured to be mounted on a hybrid vehicle. The damper device 100 is disposed between the internal combustion engine and the electric motor.

[0019] The damper device 100 is attached to a flywheel (not shown). The damper device 100 may be attached to the flywheel via a torque limiter. In FIG. 2, the internal combustion engine is disposed on the left side of the damper device 100, and the output side device is disposed on the right side of the damper device 100. The damper device 100 is configured to damp torque fluctuations between the internal combustion engine and the output side device.

[0020] The damper device 100 includes an output rotary member 2 (an example of a first rotary member), an input rotary member 3 (an example of a second rotary member), a plurality of elastic members 4, a friction member 5, and a disc spring 6.

[0021] <Output rotating member> The output rotary member 2 is configured to transmit torque from the input rotary member 3 to an output side device. The output rotary member 2 is disposed rotatably about a rotation axis O.

[0022] The output rotary member 2 has a flange plate 21 and a hub 22. The flange plate 21 and the hub 22 are configured to rotate integrally.

[0023] The flange plate 21 has an opening 211 in the center. That is, the flange plate 21 is annular. The flange plate 21 also has a plurality of accommodating holes 212. The accommodating holes 212 are arranged at intervals in the circumferential direction. Each accommodating hole 212 is configured to accommodate an elastic member 4.

[0024] The hub 22 is cylindrical. The hub 22 extends in the axial direction. The hub 22 axially penetrates openings of a first plate 31 and a second plate 32, which will be described later. The hub 22 has a spline hole 221 extending in the axial direction. A shaft (not shown) is spline-fitted into this spline hole 221. The shaft extends from the hub 22 to the first side in the axial direction. Torque is transmitted between the damper device 100 and the output-side device via this shaft.

[0025] The hub 22 is press-fitted into the opening 211 of the flange plate 21. Therefore, the hub 22 rotates integrally with the flange plate 21. Note that the hub 22 may be formed integrally with the flange plate 21 by a single member.

[0026] <Input rotating member> The input rotary member 3 is arranged to be rotatable relative to the output rotary member 2. The input rotary member 3 is arranged axially spaced apart from the output rotary member 2. The input rotary member 3 has a first plate 31 and a second plate 32. The first plate 31 and the second plate 32 are both annular members having an opening in their centers. The hub 22 of the output rotary member 2 extends through the openings of the first plate 31 and the second plate 32.

[0027] The first plate 31 and the second plate 32 rotate integrally with each other. The first plate 31 and the second plate 32 are immovable relative to each other in the axial direction. Specifically, the first plate 31 and the second plate 32 are fixed to each other by a plurality of rivets 34.

[0028] The first plate 31 and the second plate 32 are arranged at an interval in the axial direction. The flange plate 21 is arranged between the first plate 31 and the second plate 32 in the axial direction. The first plate 31 and the second plate 32 are arranged to be rotatable relative to the flange plate 21.

[0029] The first plate 31 is disposed on a first axial side relative to the flange plate 21. The first plate 31 is disposed axially apart from the flange plate 21. The second plate 32 is disposed axially on a second axial side relative to the flange plate 21. The second plate 32 is disposed axially apart from the flange plate 21.

[0030] The first plate 31 and the second plate 32 each have a plurality of window portions 311, 321. The window portions 311, 321 are arranged at intervals from each other in the circumferential direction. Each window portion 311, 321 is configured to accommodate an elastic member 4. Each window portion 311, 321 is arranged at a position overlapping with each accommodation hole 212 when viewed in the axial direction.

[0031] The input rotary member 3 has a plurality of engaged portions 33. More specifically, the first plate 31 has a plurality of engaged portions 33. Each engaged portion 33 penetrates the first plate 31 in the axial direction. That is, each engaged portion 33 is a through hole. Each engaged portion 33 is arranged at intervals from one another in the circumferential direction. Each engaged portion 33 is formed on the inner peripheral end portion of the first plate 31.

[0032] The input rotary member 3 has an annular protrusion 312. More specifically, the first plate 31 has the annular protrusion 312. The annular protrusion 312 extends in the circumferential direction. The annular protrusion 312 protrudes toward the second axial side. That is, the annular protrusion 312 protrudes toward the friction member 5.

[0033] <Elastic material> The elastic member 4 is configured to elastically connect the input rotary member 3 and the output rotary member 2 in the rotational direction. That is, the elastic member 4 elastically connects the flange plate 21 and the first and second plates 31, 32 in the rotational direction. The elastic member 4 is, for example, a coil spring.

[0034] The elastic member 4 is housed in the housing hole 212 of the flange plate 21. The elastic member 4 is housed in the window portion 311 of the first plate 31 and also in the window portion 321 of the second plate 32.

[0035] <Friction materials> The friction member 5 is disposed axially between the output rotary member 2 and the input rotary member 3. More specifically, the friction member 5 is disposed axially between the flange plate 21 and the first plate 31. The friction member 5 is disposed between the flange plate 21 and the first plate 31 so as to be movable in the axial direction.

[0036] The friction member 5 is annular and extends in the circumferential direction. The friction member 5 is configured to rotate integrally with the input rotation member 3. More specifically, the friction member 5 is configured to rotate integrally with the first plate 31. The friction member 5 may rotate relative to the input rotation member 3 within a predetermined range.

[0037] The friction member 5 is arranged to be rotatable relative to the output rotation member 2. More specifically, the friction member 5 is arranged to be rotatable relative to the flange plate 21. The friction member 5 rotates relative to the flange plate 21 while in contact with the flange plate 21, thereby generating a friction force.

[0038] FIG. 3 is a front view of the friction member 5. As shown in FIGS. 2 and 3, the friction member 5 has an opening 50 in the center. The friction member 5 has a friction portion 51, a plurality of claw portions 52, a plurality of protrusions 53, and a plurality of recesses 54. The friction portion 51 is in axial contact with the output rotation member 2. More specifically, the friction portion 51 is in contact with the flange plate 21. The friction portion 51 has an annular shape extending in the circumferential direction. The friction portion 51 has a friction material 511 attached to the surface facing the flange plate 21. Note that the friction portion 51 does not necessarily have to have the friction material 511.

[0039] The claw portions 52 are arranged at intervals from one another in the circumferential direction. Each claw portion 52 extends in the axial direction from the friction portion 51. Each claw portion 52 extends from the friction portion 51 toward the input rotation member 3. More specifically, each claw portion 52 extends toward the first plate 31. That is, each claw portion 52 extends toward a first side in the axial direction. Each claw portion 52 engages with a corresponding engaged portion 33 so that the friction member 5 rotates integrally with the input rotation member 3.

[0040] The protrusions 53 are spaced apart from one another in the circumferential direction. The protrusions 53 and the claws 52 are alternately arranged in the circumferential direction. The protrusions 53 and the claws 52 are arranged on the same circumference with the rotation axis O as the center.

[0041] Each protrusion 53 protrudes from the friction portion 51 toward the input rotation member 3. Specifically, each protrusion 53 protrudes from the friction portion 51 toward the first plate 31. That is, each protrusion 53 protrudes from the friction portion 51 toward a first side in the axial direction. Each protrusion 53 faces the first plate 31. Specifically, each protrusion 53 faces the annular protrusion 312 in the axial direction.

[0042] Each protrusion 53 is disposed axially at a distance from the annular protrusion 312 of the first plate 31. The distance between each protrusion 53 and the annular protrusion 312 is smaller than the total deflection of the disc spring 6. That is, each protrusion 53 comes into contact with the annular protrusion 312 before the disc spring 6 reaches its full deflection. Therefore, the disc spring 6 does not reach its full deflection. In addition, the distance between each protrusion 53 and the annular protrusion 312 is preferably equal to or greater than the plate thickness of the disc spring 6.

[0043] Each recess 54 is recessed radially outward from the inner circumferential surface of the friction member 5. That is, each recess 54 opens radially inward. When viewed in the axial direction, each recess 54 is disposed on an imaginary line L connecting the center of the corresponding protrusion 53 and the rotation axis O.

[0044] <Disc spring> 2, the disc spring 6 is disposed axially between the input rotation member 3 and the friction member 5. In detail, the disc spring 6 is disposed axially between the first plate 31 and the friction portion 51.

[0045] The disc spring 6 axially biases the friction member 5 toward the output rotation member 2. More specifically, the disc spring 6 biases the friction member 5 toward the flange plate 21. As a result, when the friction member 5 rotates relative to the flange plate 21, a friction force is generated.

[0046] The coned disc spring 6 abuts against the first plate 31 at its inner circumferential end, and against the friction member 5 at its outer circumferential end. The inner circumferential end of the coned disc spring 6 abuts against the annular protrusion 312 of the first plate 31. The inner circumferential end of the coned disc spring 6 does not abut against the annular protrusion 312. In other words, a portion of the inner circumferential end of the coned disc spring 6 that is radially outward from the inner circumferential end abuts against the annular protrusion 312.

[0047] Fig. 4 is a front view of the damper device 100 with the first plate 31 removed. As shown in Fig. 4, the disc spring 6 has a plurality of slits 61. Each slit 61 extends radially outward from the inner circumferential end of the disc spring 6. The slits 61 are arranged at intervals from one another in the circumferential direction.

[0048] Each protrusion 53 of the friction member 5 extends in the axial direction within each corresponding slit 61. Each protrusion 53 faces the first plate 31 via each corresponding slit 61. Furthermore, each claw 52 of the friction member 5 extends in the axial direction via each corresponding slit 61. In this manner, each claw 52 and each protrusion 53 engages with each slit 61, causing the disc spring 6 to rotate integrally with the input rotating member 3 and the friction member 5.

[0049] <Activation> Figure 5 is an enlarged cross-sectional view of the damper device 100 when no axial load is applied to the output rotating member 2, and Figure 6 is an enlarged cross-sectional view of the damper device 100 when a load is applied to the output rotating member 2 toward the first axial side.

[0050] 5, when no axial load is applied to the output rotation member 2, the protrusions 53 of the friction member 5 do not abut against the first plate 31. That is, the protrusions 53 are disposed at intervals from the first plate 31. Although not particularly limited, the interval between the protrusions 53 and the annular protrusion 312 of the first plate 31 is, for example, about 0.1 to 0.5 mm.

[0051] As shown in Figure 6, when an axial load is applied to the output rotation member 2 due to the thrust of the helical gear or the like, the friction member 5 moves toward the first side in the axial direction. Here, before the disc spring 6 is fully deflected, each protrusion 53 abuts against the annular protrusion 312. In this way, the amount of movement of the output rotation member 2 and the friction member 5 toward the first side in the axial direction is restricted, thereby suppressing wear on the disc spring 6.

[0052] [Variations] Although the embodiments of the present invention have been described above, the present invention is not limited to these, and various modifications are possible without departing from the spirit of the present invention. Note that the following modifications can basically be applied simultaneously.

[0053] (a) In the above embodiment, the disc spring 6 biases the friction member 5 toward the output rotating member 2, but the configuration of the damper device 100 is not limited to this. For example, the disc spring 6 may bias the friction member 5 toward the input rotating member 3. That is, the disc spring 6 may bias the friction member 5 toward the first plate 31. In this case, the positions of the disc spring 6 and the friction member 5 are interchanged. Furthermore, each protrusion 53 of the friction member 5 protrudes toward the flange plate 21. That is, in this modified example, the output rotating member 2 is an example of a second rotating member, and the input rotating member 3 is an example of a first rotating member.

[0054] (b) The friction member 5 may rotate integrally with the output rotational member 2 and frictionally engage with the input rotational member 3. For example, the flange plate 21 of the output rotational member 2 has an engaged portion 33. The friction portion 51 of the friction member 5 contacts the input rotational member 3, and each of the claw portions 52 and each of the protrusions 53 extend toward the flange plate 21 and engage with the engaged portion 33. In this case, the output rotational member 2 is an example of a second rotational member, and the input rotational member 3 is an example of a first rotational member.

[0055] (c) In the above embodiment, the friction member 5 and the disc spring 6 were arranged between the first plate 31 and the flange plate 21, but the friction member 5 and the disc spring 6 may also be arranged between the second plate 32 and the flange plate 21.

[0056] (d) In the above embodiment, the protrusion 53 is not in contact with the annular protrusion 312 when the damper device 100 is stopped, but the protrusion 53 may be in contact with the annular protrusion 312 when the damper device 100 is stopped. [Explanation of symbols]

[0057] 2: Output rotating member 3: Input rotating member 312: Annular protrusion 5: Friction material 50: Opening 51:Friction part 52: Claw part 53: Protrusion 54: Recess 6: Disc spring 61: Slit 100: Damper device O: Rotation axis

Claims

1. a first rotating member; a second rotating member that is arranged at an interval from the first rotating member in the axial direction and that is arranged to be rotatable relative to the first rotating member; a friction member disposed between the first rotary member and the second rotary member in the axial direction; a disc spring disposed between the second rotary member and the friction member in the axial direction; Equipped with The friction member has a protruding portion that protrudes toward the second rotary member and faces the second rotary member. Power transmission device.

2. The protrusion is disposed axially apart from the second rotary member. The power transmission device according to claim 1 .

3. a distance between the protrusion and the second rotary member in the axial direction is smaller than a total deflection amount of the disc spring; The power transmission device according to claim 2 .

4. a distance between the protruding portion and the second rotary member in the axial direction is equal to or greater than a plate thickness of the disc spring; The power transmission device according to claim 2 .

5. The disc spring has a slit extending radially outward from an inner peripheral end thereof, the protrusion faces the second rotary member via the slit; The power transmission device according to claim 1 .

6. the friction member has a claw portion that engages with the second rotary member, The protrusion is disposed on the same circumference as the claw. The power transmission device according to claim 1 .

7. the second rotating member has an annular protrusion extending in a circumferential direction, the annular protrusion protrudes toward the friction member, The protrusion faces the annular protrusion. The power transmission device according to claim 1 .

8. The friction member has an opening in the center, The friction member has a recess recessed from an inner circumferential surface to an outer side in the radial direction, The recess is disposed on a virtual line connecting the center of the protrusion and the rotation axis when viewed in the axial direction. The power transmission device according to claim 1 .

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