Power transmission device
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- EXEDY CORP
- Filing Date
- 2025-01-24
- Publication Date
- 2026-08-05
Smart Images
Figure 2026126822000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a power transmission device.
Background Art
[0002] A damper device, which is an example of a power transmission device, includes an input rotating member, an output rotating member, and a plurality of elastic members (see, for example, Patent Document 1). The input rotating member and the output rotating member are arranged to be relatively rotatable. The input rotating member has a first and a second plate. The output rotating member has a hub and a flange plate. The flange plate is disposed between the first plate and the second plate. An input shaft of a transmission or the like is spline-fitted to the hub.
[0003] Also, in order to suppress resonance, the damper device has a pair of friction members and a disc spring. One of the friction members is disposed between the first plate and the flange plate, and the other friction member is disposed between the second plate and the flange plate. The disc spring is disposed between the first plate and the friction member.
Prior Art Documents
Patent Documents
[0004]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0005] In the power transmission device configured as described above, a problem occurs in that the second plate is deformed. Therefore, an object of the present invention is to suppress the deformation of the second plate.
Means for Solving the Problems
[0006] The power transmission device according to the first embodiment comprises a first rotating member, a second rotating member, a first friction member, a second friction member, a first disc spring, and a second disc spring. The first rotating member has a first plate and a second plate. The first plate and the second plate are spaced apart from each other in the axial direction. The second rotating member is arranged to be rotatable relative to the first rotating member. The second rotating member has a hub and a flange plate. The hub extends in the axial direction. The flange plate is arranged between the first plate and the second plate in the axial direction. The first friction member is arranged between the first plate and the flange plate in the axial direction. The second friction member is arranged between the second plate and the flange plate in the axial direction. The first disc spring is arranged between the first plate and the flange plate in the axial direction. The first disc spring biases the first friction member in the axial direction. The second disc spring is arranged between the second plate and the flange plate in the axial direction. The second disc spring biases the second friction member in the axial direction.
[0007] As a result of diligent research, the inventors have discovered that loads are applied to the flange plate toward the first and second plates via an input shaft that fits into the hub, and that while the load toward the first plate is absorbed by the disc spring, the load toward the second plate is not absorbed by the disc spring and acts upon the second plate, causing deformation of the second plate. Therefore, the inventors have not only placed the first disc spring between the first plate and the flange plate, as in the power transmission device according to the first embodiment described above, but have also placed the second disc spring between the second plate and the flange plate. As a result, the load toward the first plate is absorbed by the first disc spring, and the load toward the second plate is absorbed by the second disc spring, and as a result, deformation of the second plate can be suppressed.
[0008] The power transmission device according to the second embodiment is configured as follows in the power transmission device according to the first embodiment: A first disc spring is placed between a first plate and a first friction member. A second disc spring is placed between a second plate and a second friction member.
[0009] The power transmission device according to the third embodiment is configured as follows in the power transmission device according to the second embodiment: The first disc spring abuts against the first plate at its inner end and against the first friction member at its outer end. The second disc spring abuts against the second plate at its inner end and against the second friction member at its outer end.
[0010] 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 friction member is configured to rotate integrally with the first plate and to abut against the flange plate. The second friction member is configured to rotate integrally with the second plate and to abut against the flange plate.
[0011] 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 first friction member and the second friction member are symmetrical in shape with respect to the flange plate.
[0012] 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 first disc spring and the second disc spring are symmetrical in shape with respect to the flange plate.
[0013] 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 first disc spring is configured to rotate integrally with the first friction member. The second disc spring is configured to rotate integrally with the second friction member.
[0014] 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: Only the first friction member is arranged in the axial direction between the first disc spring and the flange plate. Only the second friction member is arranged in the axial direction between the second disc spring and the flange plate. [Effects of the Invention]
[0015] According to the present invention, deformation of the second plate can be suppressed. [Brief explanation of the drawing]
[0016] [Figure 1] Front view of the damper device. [Figure 2] Cross-sectional view along line II-II in Figure 1. [Figure 3] Enlarged cross-sectional view of the damper device. [Modes for carrying out the invention]
[0017] The 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 device is located (right side in Figure 2), and the second axial side refers to the side where the internal combustion engine is located (left side in Figure 2).
[0018] Figure 1 is a front view of the damper device 100, and Figure 2 is a cross-sectional view taken along line II-II in Figure 1. As shown in Figures 1 and 2, the damper device 100 is installed 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 installed in a hybrid vehicle. The damper device 100 is positioned between the internal combustion engine and the electric motor.
[0019] The damper device 100 is attached to the flywheel (not shown). Alternatively, the damper device 100 may be attached to the flywheel via a torque limiter. In Figure 2, the internal combustion engine is located to the left of the damper device 100, and the output device is located to the right of the damper device 100. The damper device 100 is configured to dampen torque fluctuations between the internal combustion engine and the output device.
[0020] The damper device 100 has a first rotating member 2, a second rotating member 3, a plurality of elastic members 4, a first friction member 5a, a second friction member 5b, a first dish spring 6a, and a second dish spring 6b.
[0021] <First rotating member> The first rotating member 2 is configured to receive torque from an internal combustion engine. Specifically, the first rotating member 2 is configured to be attached to a flywheel (not shown). Note that the first rotating member 2 may be attached to the flywheel via a torque limiter (not shown).
[0022] The first rotating member 2 is arranged to be rotatable. The first rotating member 2 has a first plate 21 and a second plate 22. Both the first plate 21 and the second plate 22 are annular members having an opening at the center.
[0023] The first plate 21 and the second plate 22 rotate integrally with each other. Also, the first plate 21 and the second plate 22 are relatively immovable in the axial direction. Specifically, the first plate 21 and the second plate 22 are fixed to each other by a plurality of rivets 23. The first plate 21 and the second plate 22 are arranged at intervals in the axial direction.
[0024] The first plate 21 and the second plate 22 each have a plurality of window portions 211, 221. The respective window portions 211, 221 are arranged at intervals in the circumferential direction. The respective window portions 211, 221 are configured to accommodate the elastic members 4. The respective window portions 211, 221 are arranged at positions overlapping with respective accommodation holes 321, which will be described later, in an axial view.
[0025] The first plate 21 and the second plate 22 each have a plurality of engaging portions 212, 222. Each engaging portion 212, 222 penetrates the first plate 21 and the second plate 22 in the axial direction. That is, each engaging portion 212, 222 is a through hole. Each engaging portion 212, 222 is spaced apart from each other in the circumferential direction. Each engaging portion 212, 222 is formed at the inner circumferential end of the first plate 21 and the second plate 22.
[0026] The inner circumferential end of the first plate 21 is curved outwards in the first axial direction so as not to come into contact with the inner circumferential edge of the first disc spring 6a. For this reason, the first plate 21 has a stepped portion 213. The inner circumferential end of the first plate 21 is positioned at an axial distance from the inner circumferential edge of the first disc spring 6a.
[0027] The inner circumferential end of the second plate 22 is curved outwards in the second axial direction so as not to come into contact with the inner circumferential edge of the second disc spring 6b. For this reason, the second plate 22 has a stepped portion 223. The inner circumferential end of the second plate 22 is positioned at an axial distance from the inner circumferential edge of the second disc spring 6b.
[0028] <Second rotating member> The second rotating member 3 is positioned to be rotatable relative to the first rotating member 2. The second rotating member 3 is configured to transmit torque from the first rotating member 2 to the output device. The second rotating member 3 is positioned to be rotatable about the rotation axis O.
[0029] The second rotating member 3 has a hub 31 and a flange plate 32. The hub 31 and the flange plate 32 are configured to rotate integrally.
[0030] The hub 31 is cylindrical. The hub 31 extends axially. The hub 31 penetrates axially through the openings of the first plate 21 and the second plate 22. The hub 31 has a spline hole 311 that extends axially. The input shaft (not shown) of the output-side device is spline-fitted into this spline hole 311. The input shaft extends axially in the first direction from the hub 31. Torque is transmitted between the damper device 100 and the output-side device via this input shaft.
[0031] The flange plate 32 extends radially outward from the hub 31. In this embodiment, the flange plate 32 is integrally formed with the hub 31 from a single component, but the flange plate 32 may be made from a separate component from the hub 31. The flange plate 32 moves axially integrally with the hub 31.
[0032] The flange plate 32 is annular in shape. The flange plate 32 also has a plurality of accommodating holes 321. Each accommodating hole 321 is spaced apart from the others in the circumferential direction. Each accommodating hole 321 is configured to accommodate an elastic member 4.
[0033] The flange plate 32 is arranged to be rotatable relative to the first plate 21 and the second plate 22. The first plate 21 is positioned on the first axial side relative to the flange plate 32. The first plate 21 is positioned at an axial distance from the flange plate 32. The second plate 22 is positioned on the second axial side relative to the flange plate 32. The second plate 22 is positioned at an axial distance from the flange plate 32. The flange plate 32 is positioned between the first plate 21 and the second plate 22 in the axial direction.
[0034] <Elastic material> The elastic member 4 is configured to elastically connect the first rotating member 2 and the second rotating member 3 in the rotational direction. That is, the elastic member 4 elastically connects the first and second plates 21 and 22 and the flange plate 32 in the rotational direction. The elastic member 4 is, for example, a coil spring.
[0035] The elastic member 4 is housed in the housing hole 321 of the flange plate 32. The elastic member 4 is also housed in the window portion 211 of the first plate 21 and in the window portion 221 of the second plate 22.
[0036] <First and second friction members> The first friction member 5a is positioned in the axial direction between the first plate 21 and the flange plate 32. The first friction member 5a is positioned to be movable in the axial direction between the flange plate 32 and the first plate 21.
[0037] The first friction member 5a is annular and extends in the circumferential direction. The first friction member 5a is configured to rotate integrally with the first plate 21. The first friction member 5a may also rotate relative to the first plate 21 within a predetermined range. The first friction member 5a is arranged to be rotatable relative to the flange plate 32.
[0038] The first friction member 5a has an opening 50a in its central part. The first friction member 5a has a friction portion 51a and a plurality of claw portions 52a. The friction portion 51a is in contact with the flange plate 32 in the axial direction. The friction portion 51a is annular in shape and extends in the circumferential direction. The friction portion 51a is in contact with the flange plate 32 on the annular surface facing the flange plate 32. The friction portion 51a has a friction material, and this friction material may be in contact with the flange plate 32.
[0039] Each claw portion 52a is spaced apart from one another in the circumferential direction. Each claw portion 52a extends axially from the friction portion 51a toward the first plate 21. That is, each claw portion 52a extends toward the first axial direction. Each claw portion 52a engages with the corresponding engaged portion 212 such that the first friction member 5a rotates integrally with the first plate 21.
[0040] The second friction member 5b is positioned axially between the second plate 22 and the flange plate 32. The second friction member 5b has the same shape as the first friction member 5a. That is, the second friction member 5b has an opening 50b, a friction portion 51b, and a plurality of claw portions 52b. The second friction member 5b is also the same size as the first friction member 5a. The first friction member 5a and the second friction member 5b are symmetrical in shape with respect to the flange plate 32.
[0041] The second friction member 5b is configured to rotate integrally with the second plate 22. That is, each claw portion 52b of the second friction member 5b engages with the corresponding engaged portion 222. The friction portion 51b of the second friction member 5b is in contact with the flange plate 32.
[0042] <First and second disc springs> The first disc spring 6a is positioned axially between the first plate 21 and the flange plate 32. More specifically, the first disc spring 6a is positioned between the first plate 21 and the friction portion 51a of the first friction member 5a.
[0043] The first disc spring 6a biases the first friction member 5a toward the flange plate 32 in the axial direction. That is, the first disc spring 6a biases the first friction member 5a toward the second axial direction. As a result, frictional force is generated when the first friction member 5a rotates relative to the flange plate 32. Note that the first disc spring 6a biases only the first friction member 5a. In other words, only the first friction member 5a is positioned between the first disc spring 6a and the flange plate 32 in the axial direction, and no other friction members are positioned there.
[0044] The first disc spring 6a is in contact with the first plate 21 at its inner circumference and with the first friction member 5a at its outer circumference. The inner circumference of the first disc spring 6a is in contact with the stepped portion 213 of the first plate 21. The inner circumference edge of the first disc spring 6a is not in contact with the first plate 21. In other words, the first disc spring 6a is in contact with the first plate 21 at the portion of its inner circumference that is radially outward from the inner circumference edge.
[0045] Figure 3 is an enlarged cross-sectional view of the damper device 100. As shown in Figure 3, the first disc spring 6a has a plurality of slits 61a. Each slit 61a extends radially outward from the inner circumferential end of the first disc spring 6a. The slits 61a are spaced apart from each other in the circumferential direction.
[0046] Each claw portion 52a of the first friction member 5a extends axially through the corresponding slit 61a. In this way, the engagement of each claw portion 52a with each slit 61a causes the first disc spring 6a to rotate integrally with the first plate 21 and the first friction member 5a.
[0047] As shown in Figures 2 and 3, the second disc spring 6b is positioned axially between the second plate 22 and the flange plate 32. More specifically, the second disc spring 6b is positioned between the second plate 22 and the friction portion 51b of the second friction member 5b.
[0048] The second disc spring 6b biases the second friction member 5b toward the flange plate 32 in the axial direction. That is, the second disc spring 6b biases the second friction member 5b toward the first axial direction. As a result, frictional force is generated when the second friction member 5b rotates relative to the flange plate 32. Note that the second disc spring 6b biases only the second friction member 5b. In other words, only the second friction member 5b is positioned between the second disc spring 6b and the flange plate 32 in the axial direction, and no other friction members are positioned there.
[0049] The second disc spring 6b is in contact with the second plate 22 at its inner circumference and with the second friction member 5b at its outer circumference. The inner circumference of the second disc spring 6b is in contact with the stepped portion 223 of the second plate 22. The inner circumference edge of the second disc spring 6b is not in contact with the second plate 22. In other words, the second disc spring 6b is in contact with the second plate 22 at the portion of its inner circumference that is radially outward from the inner circumference edge.
[0050] The second disc spring 6b has the same shape as the first disc spring 6a. That is, the second disc spring 6b has multiple slits 61b. Also, the second disc spring 6b is the same size as the first disc spring 6a. For this reason, the biasing force of the second disc spring 6b is the same as that of the first disc spring 6a. The first disc spring 6a and the second disc spring 6b are symmetrical in shape with respect to the flange plate 32.
[0051] The second disc spring 6b is configured to rotate integrally with the second friction member 5b. Specifically, each claw portion 52b of the second friction member 5b extends axially through the corresponding slits 61b. In this way, the engagement of each claw portion 52b with each slit 61b causes the second disc spring 6b to rotate integrally with the second plate 22 and the second friction member 5b.
[0052] [Differentiation] Although embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications are possible without departing from the spirit of the invention. Furthermore, the following modifications can basically be applied simultaneously.
[0053] (a) In the above embodiment, the first disc spring 6a is positioned between the first friction member 5a and the first plate 21, but the configuration of the damper device 100 is not limited thereto. For example, the first disc spring 6a may be positioned between the first friction member 5a and the flange plate 32. In this case, the first friction member 5a is configured to rotate integrally with the flange plate 32, rotate relative to the first plate 21, and generate a frictional force between it and the first plate 21. Similarly, the second disc spring 6b may be positioned between the second friction member 5b and the flange plate 32. The second friction member 5b is configured to rotate integrally with the flange plate 32, rotate relative to the second plate 22, and generate a frictional force between it and the second plate 22.
[0054] (b) In the above embodiment, the first disc spring 6a is in contact with the first friction member 5a at its outer circumference and with the first plate 21 at its inner circumference, but the configuration of the first disc spring 6a is not limited to this. For example, the first disc spring 6a may be in contact with the first friction member 5a at its inner circumference and with the first plate 21 at its outer circumference. In this case, it is preferable that the second disc spring 6b is in contact with the second friction member 5b at its inner circumference and with the second plate 22 at its outer circumference. [Explanation of symbols]
[0055] 2: First rotating member 21: First Plate 22: Second Plate 3: Second rotating member 31: Hub 32: Flange plate 5a: First friction member 5b: Second friction member 6a: First disc spring 6b: Second disc spring 100: Damper device
Claims
1. A first rotating member having a first plate and a second plate arranged at a distance from each other in the axial direction, A hub extending in the axial direction, and a flange plate positioned between the first plate and the second plate in the axial direction, a second rotating member positioned to be rotatable relative to the first rotating member, A first friction member is positioned between the first plate and the flange plate in the axial direction, A second friction member is positioned between the second plate and the flange plate in the axial direction, A first disc spring is positioned between the first plate and the flange plate in the axial direction and biases the first friction member in the axial direction. A second disc spring is positioned between the second plate and the flange plate in the axial direction and biases the second friction member in the axial direction. A power transmission device equipped with the following features.
2. The first disc spring is positioned between the first plate and the first friction member. The second disc spring is positioned between the second plate and the second friction member. The power transmission device according to claim 1.
3. The first disc spring abuts the first plate at its inner circumferential end and abuts the first friction member at its outer circumferential end. The second disc spring contacts the second plate at its inner end and the second friction member at its outer end. The power transmission device according to claim 2.
4. The first friction member is configured to rotate integrally with the first plate and to contact the flange plate, The second friction member is configured to rotate integrally with the second plate and to contact the flange plate. The power transmission device according to claim 1.
5. The first friction member and the second friction member are symmetrical in shape with respect to the flange plate. The power transmission device according to claim 1.
6. The first disc spring and the second disc spring are symmetrical in shape with respect to the flange plate. The power transmission device according to claim 1.
7. The first disc spring is configured to rotate integrally with the first friction member, The second disc spring is configured to rotate integrally with the second friction member. The power transmission device according to claim 1.
8. Only the first friction member is positioned between the first disc spring and the flange plate in the axial direction. Only the second friction member is positioned between the second disc spring and the flange plate in the axial direction. The power transmission device according to claim 1.