Damper device

Abstract

To suppress positional deviation in a radial direction of a damper unit with respect to a torque limiter unit of a damper device.SOLUTION: A damper device of this invention includes a torque limiter unit 10, a damper unit 20, and a positioning structure. The torque limiter unit 10 has a damper cover 11 fixed to a first side surface in an axial direction of a flywheel 2. The damper unit 20 has an outer peripheral end arranged closer to a second side in the axial direction than an inner peripheral end of the damper cover 11, and power is transmitted between the flywheel 2 and the damper unit 20 through the torque limiter unit 10. The positioning structure positions the damper unit 20 in a radial direction with respect to the torque limiter unit 10 by allowing an outer peripheral surface of a core plate 16 of a friction disk 13 to abut on an inner surface of the damper cover 11 of the torque limiter unit.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a damper device, particularly a damper device that can be attached to a member on the power source side.

Background Art

[0002] For example, in a hybrid vehicle equipped with an engine and an electric motor, in order to prevent excessive torque from being transmitted from the output side to the engine side when starting the engine, a damper device having a torque limiter function as shown in Patent Document 1 is used.

[0003] The damper device of Patent Document 1 has a damper unit having a pair of plates and a plurality of torsion springs, and a torque limiter unit is provided on the outer peripheral side of this damper unit.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the damper device of Patent Document 1, the torque limiter unit is fixed to the flywheel, and the damper unit is often attached to the input shaft of a transmission or the like. In such a situation, particularly when the flywheel is fixed to a member on the engine side via a flexible plate, the pressing force of the cone spring against the friction disk may become uneven during rotation in the torque limiter unit. When such a phenomenon occurs, since the friction disk is fixed to the damper unit, a problem occurs in that the radial position of the damper unit with respect to the torque limiter unit is displaced.

[0006] The object of the present invention is to suppress radial displacement of the damper unit relative to the torque limiter unit during operation of the damper device. [Means for solving the problem]

[0007] (1) A damper device according to the first aspect of the present invention can be mounted on a member on the power source side. This damper device comprises a torque limiter unit, a damper unit, and a positioning structure. The torque limiter unit has an annular cover plate fixed to the first axial side surface of the member on the power source side. The damper unit has its outer peripheral end positioned on the second axial side of the inner peripheral end of the cover plate and transmits power to the power source via the torque limiter unit. The positioning structure radially positions the damper unit with respect to the torque limiter unit.

[0008] In this damper device, even if the outer peripheral end of the damper unit is positioned on the second axial side of the inner peripheral end of the cover plate, the positioning structure allows the damper unit to be radially positioned relative to the torque limiter unit.

[0009] (2) Preferably, the cover plate has a disc-shaped friction portion and a mounting portion provided radially outward from the friction portion and attached to a member on the power source side. The torque limiter unit further has a friction disc positioned on the second axial side of the friction portion of the cover plate and pressed against the friction portion. In this case, preferably, the damper unit has a disc-shaped input rotating body, the input rotating body is positioned such that its outer peripheral end is located on the second axial side of the friction portion of the cover plate, and the inner circumference of the friction disc is fixed to the first axial side surface of the outer peripheral end. The positioning structure positions the damper unit radially relative to the torque limiter unit by making the outer peripheral end surface of the friction disc contact the cover plate of the torque limiter unit.

[0010] In this device, even when the outer peripheral end of the damper unit is positioned on the second axial side of the inner peripheral end of the cover plate, the damper unit can be radially positioned relative to the torque limiter unit by allowing the outer peripheral end surface of the friction disk fixed to the first axial side of the input rotating body to contact the cover plate of the torque limiter unit.

[0011] (3) Preferably, the friction portion of the cover plate is offset to the first axial side with respect to the mounting portion. The cover plate also has a connecting portion that extends axially and connects the friction portion and the mounting portion. The outer peripheral end face of the friction disc can contact the inner surface of the connecting portion.

[0012] (4) Preferably, the friction disc comprises a core plate and a pair of friction members fixed to both sides of the core plate. In this case, the outer peripheral end face of the core plate protrudes radially outward from the outer peripheral end faces of the pair of friction members and can contact the inner surface of the connecting portion of the cover plate.

[0013] In this device, if the damper unit is displaced radially, the outer peripheral end face of the core plate of the friction disc fixed to the damper unit comes into contact with the inner surface of the connecting portion of the cover plate. This suppresses radial displacement of the damper unit relative to the torque limiter unit.

[0014] Here, the core plate is a flat plate, and its outer diameter can be precisely controlled. Therefore, the gap between the outer peripheral end face of the core plate and the inner surface of the connecting part of the cover plate can be precisely controlled, further reducing the radial positional displacement of the damper unit.

[0015] (5) Preferably, the input rotating body of the damper unit has a first plate and a second plate. The inner circumferential end of the core plate is fixed to the first axial side of the outer circumferential end of the first plate. The second plate is positioned on the second axial side of the first plate, facing the first plate, and is fixed to the first plate so as not to rotate relative to it.

[0016] (6) Preferably, the power source components are fixed to the power source via a flexible plate.

[0017] (7) The damper device according to the second aspect of the present invention can be mounted on a member on the power source side. This damper device includes a torque limiter unit attached to a member on the power source side, a damper unit that transmits power to and from the power source via the torque limiter unit, and a positioning structure for radially positioning the damper unit with respect to the torque limiter unit, It is equipped with.

[0018] The torque limiter unit comprises an annular cover plate and a friction disc. The cover plate has a disc-shaped friction portion and a mounting portion positioned radially outward from the friction portion and offset axially from the friction portion. The friction disc is pressed against the friction portion of the cover plate, and its outer peripheral end face can contact the inner surface of the cover plate. The positioning structure then positions the damper unit radially relative to the torque limiter unit by bringing the outer peripheral end face of the friction disc into contact with the inner surface of the cover plate.

[0019] (8) Preferably, the damper unit has an input-side rotating body to which the inner circumference of the friction disc is fixed. The inner circumference end of the cover plate and the outer circumference end of the input-side rotating body of the damper unit are offset in the axial direction.

[0020] (9) Preferably, the cover plate further has a connecting portion that extends axially and connects the friction portion and the mounting portion. The friction disc has a core plate and a pair of friction members fixed to both sides of the core plate. The outer peripheral end face of the core plate protrudes radially outward from the outer peripheral end faces of the pair of friction members and is capable of contacting the inner surface of the connecting portion of the cover plate. [Effects of the Invention]

[0021] In the present invention as described above, it is possible to suppress the radial displacement of the damper unit with respect to the torque limiter unit.

Brief Description of the Drawings

[0022] [Figure 1] Cross-sectional view of a power transmission device having a damper device according to an embodiment of the present invention. [Figure 2] Partial front view of the damper device of FIG. 1. [Figure 3] Enlarged partial view of FIG. 1.

Mode for Carrying Out the Invention

[0023] [Overall Configuration] FIG. 1 is a cross-sectional view of a power transmission device 1 having a damper device according to an embodiment of the present invention. This power transmission device 1 includes a flywheel 2 and a damper device 3. Further, FIG. 2 is a front partial view of the power transmission device 1 with some components removed. In FIG. 1, an engine is arranged on the left side of the power transmission device 1, and a drive unit including an electric motor, a transmission, etc. is arranged on the right side.

[0024] In the following description, the axial direction is the direction in which the rotation axis O of the damper device 3 extends. 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 exactly coincide with the circumferential direction of a circle centered on the rotation axis O, and the radial direction does not have to exactly coincide with the diameter direction of a circle centered on the rotation axis O.

[0025] [Flywheel 2] The flywheel 2 is fixed to a member on the engine side (not shown) via a flexible plate 5. As shown in FIG. 1, the flywheel 2 is a disc-shaped member and has an annular portion 2a and a housing portion 2b.

[0026] The annular portion 2a is provided on the outermost circumference of the flywheel 2. Multiple screw holes are formed on the surface of the annular portion 2a on the drive unit side (the first axial side, the right side in Figure 1), and a knock pin is fixed thereto. The housing portion 2b is formed radially inward of the annular portion 2a. The housing portion 2b has a predetermined depth from the mounting surface of the annular portion 2a toward the engine.

[0027] [Damper device 3] The damper device 3 is fixed to the first axial side of the annular portion 2a of the flywheel 2 and is a device for limiting the torque transmitted between the engine and the drive unit and for damping rotational fluctuations. The damper device 3 includes a torque limiter unit 10 and a damper unit 20.

[0028] [Torque limiter unit 10] The torque limiter unit 10 limits the torque transmitted between the flywheel 2 and the damper unit 20. As shown in an enlarged view in Figure 3, the torque limiter unit 10 includes a damper cover 11 (an example of a cover plate), a pressure plate 12, a friction disc 13, a cone spring 14, and a support plate 15.

[0029] The damper cover 11 is a plate and has a friction portion 11a, a mounting portion 11b, and a connecting portion 11c.

[0030] The friction portion 11a is disc-shaped and formed on the inner circumference of the damper cover 11. The mounting portion 11b is formed radially outward from the friction portion 11a and is fixed to the annular portion 2a of the flywheel 2 via bolts. The friction portion 11a is formed offset to the first axial side relative to the mounting portion 11b. The connecting portion 11c is formed in a cylindrical shape extending in the axial direction and connects the outer circumference of the friction portion 11a and the inner circumference of the mounting portion 11b.

[0031] The pressure plate 12 is annular in shape and is positioned on the second axial side of the damper cover 11, opposite the friction portion 11a, with a predetermined distance between them.

[0032] The friction disc 13 is positioned axially between the friction portion 11a of the damper cover 11 and the pressure plate 12. The friction disc 13 has a core plate 16 and a pair of friction members 17 fixed to both sides of the core plate 16 by rivets. One friction member 17 abuts against the friction portion 11a of the damper cover 11, and the other friction member 17 abuts against the pressure plate 12.

[0033] As shown in Figure 2, the core plate 16 is formed in an annular shape and has a plurality of radial slits that open radially outward. The core plate 16 also has a plurality of protrusions 16a that project radially inward from its inner circumferential surface. The outer circumferential end face of the core plate 16 is formed to protrude from the outer circumferential end face of the pair of friction members 17. That is, the outer diameter of the core plate 16 is formed to be larger than the outer diameter of the pair of friction members 17. The outer circumferential end face of the core plate 16 is radially opposite to the inner circumferential surface of the connecting portion 11c of the damper cover 11 with a predetermined gap (for example, 0.5 to 1 mm) between them.

[0034] The cone spring 14 is positioned on the second axial side of the pressure plate 12, and the support plate 15 is positioned further on the second axial side of the cone spring 14. That is, the cone spring 14 is positioned between the pressure plate 12 and the support plate 15, and presses the friction disc 13 against the friction portion 11a of the damper cover 11 via the pressure plate 12.

[0035] The support plate 15 has a support portion 15a and a mounting portion 15b. The support portion 15a is annular and is formed on the inner circumference of the support plate 15. The support portion 15a faces the pressure plate 12 in the axial direction, and the cone spring 14 is sandwiched between this support portion 15a and the pressure plate 12.

[0036] The mounting portion 15b has multiple fixing holes, and the support plate 15 is fixed to the annular portion 2a of the flywheel 2 together with the damper cover 11 by bolts that pass through the fixing holes.

[0037] [Damper Unit 20] As shown in Figure 1, the damper unit 20 includes a clutch plate 21 (an example of a first plate) and a retaining plate 22 (an example of a second plate), a hub flange 23, a plurality of torsion springs 24, and a hiss generation mechanism 25.

[0038] Here, the outer peripheral ends of the clutch plate 21 and the retaining plate 22 are positioned on the second axial side with respect to the friction portion 11a of the damper cover 11 (i.e., the inner peripheral end of the damper cover 11).

[0039] On the outer circumference of the clutch plate 21, the protruding portion 16a of the core plate 16 of the friction disc 13 is fixed to the first axial side surface by rivets 26. The clutch plate 21 is formed in a disc shape and has a plurality of windows. The retrieval plate 22 is positioned on the second axial side of the clutch plate 21 and is positioned opposite the clutch plate 21 with an axial gap between them. The retrieval plate 22 is formed in a disc shape and has a plurality of windows at positions opposite to the windows of the clutch plate 21. The clutch plate 21 and the retrieval plate 22 are fixed to each other by rivets 27 and are immovable relative to each other in the axial and rotational directions.

[0040] The hub flange 23 has a cylindrical hub 31 formed in its center and a flange 32 extending radially outward from the outer circumferential surface of the hub 31. The hub flange 23 is rotatable relative to the clutch plate 21 and the retaining plate 22. The hub 31 and the flange 32 are connected so as not to rotate relative to each other. A spline hole 31a is formed on the inner circumferential surface of the hub 31, and the input shaft of the drive unit can be spline-engaged into this spline hole 31a. The flange 32 is formed in a disc shape and is positioned axially between the clutch plate 21 and the retaining plate 22. The flange 32 has a plurality of accommodating sections. Each accommodating section is formed at a position corresponding to the window section of the clutch plate 21 and the window section of the retaining plate 22.

[0041] Multiple torsion springs 24 are flanged 32 The torsion spring 24 is housed in the housing section and held in the axial and radial directions by the window section of the clutch plate 21 and the window section of the retaining plate 22. In addition, both circumferential end faces of the torsion spring 24 can contact the respective window section and the circumferential end face of the housing section.

[0042] The hysteresis generation mechanism 25 has multiple bushings, cone springs, etc. This hysteresis generation mechanism 25 generates frictional resistance (hysteresis torque) when the clutch plate 21 and retaining plate 22 and the hub flange 23 rotate relative to each other.

[0043] [Positioning structure] In this embodiment, the outer peripheral end of the damper unit 20 (specifically, the outer peripheral ends of the clutch plate and retaining plates 21 and 22) and the inner peripheral end of the damper cover 11 (specifically, the inner peripheral end of the friction portion 11a) are offset in the axial direction. diameter They do not overlap with each other in any direction. Therefore, for example, the radial movement of the damper unit 20 cannot be restricted by bringing the outer periphery of the components constituting the damper unit 20 into contact with the damper cover 11 of the torque limiter unit 10.

[0044] Therefore, in this embodiment, as described above, the outer diameter of the core plate 16 is made larger than the outer diameter of the friction member 17, so that the outer peripheral end face of the core plate 16 faces the inner peripheral surface of the connecting portion 11c of the damper cover 11 radially with a predetermined gap (for example, 0.5 to 1 mm) between them.

[0045] Therefore, if the damper unit 20 shifts radially during rotation, the outer peripheral end surface of the core plate 16 fixed to the damper unit 20 comes into contact with the inner surface of the connecting portion 11c of the damper cover 11, thereby restricting the shift. In other words, the contact between the outer peripheral end surface of the core plate 16 and the inner peripheral surface of the connecting portion 11c positions the damper unit 20 radially relative to the torque limiter unit 10.

[0046] In particular, since the core plate 16 is flat and not bent, the radial dimensions of the outer end face can be easily and accurately controlled. Therefore, by machining the inner surface of the mating connecting portion 11c, the gap between the core plate 16 and the inner surface of the connecting portion 11c can be strictly controlled. As a result, the radial displacement of the damper unit 20 relative to the torque limiter unit 10 can be kept to a minimum.

[0047] [Operation] The power transmitted from the engine to the flywheel 2 is input to the damper unit 20 via the torque limiter unit 10. In the damper unit 20, power is input to the clutch plate 21 and retaining plate 22 to which the friction disc 13 of the torque limiter unit 10 is fixed, and this power is transmitted to the hub flange 23 via the torsion spring 24. From the hub flange 23, power is further transmitted to the output side electric motor, generator, transmission, etc.

[0048] 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 10 limits the torque transmitted to the engine side to a predetermined value or less.

[0049] [Other embodiments] 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.

[0050] (a) The gap between the outer peripheral end face of the core plate 16 and the inner peripheral surface of the connecting portion of the damper cover 11 is an example and is not limited thereto.

[0051] (b) In the above embodiment, the outer peripheral end face of the core plate 16 of the friction disc 13 is made to contact the inner peripheral surface of the damper cover 11, but other parts of the friction disc 13, for example, the outer peripheral end face of the friction member 17, may also be made to contact.

[0052] (c) In the above embodiment, the present invention was applied to a device in which the flywheel 2 is connected to an engine-side component via a flexible plate 5, but the application of the present invention is not limited to such a device.

[0053] (d) The positioning structure of the present invention is not limited to the above-described embodiment. For example, the outer peripheral end of the retaining plate 22 of the damper unit 20 may be brought into contact with the components of the torque limiter unit 10.

[0054] (e) In the above embodiment, the present invention was applied to a device in which the outer peripheral end of the damper unit 20 is located on the second axial side of the inner peripheral end of the damper cover 11. However, when a positioning structure is configured by bringing the outer peripheral end surface of the friction disc into contact with the inner surface of the damper cover 11, the positional relationship between the outer peripheral end of the damper unit 20 and the inner peripheral end of the damper cover 11 is not limited to the above embodiment. [Explanation of symbols]

[0055] 2. Flywheel (component on the power source side) 3. Damper device 5 Flexible Plate 10 Torque Limiter Unit 11. Damper cover (cover plate) 13 Friction Discs 16 core plates 17 Friction Members 20 Damper Units 21 Plate 1 22 Second Plate

Claims

1. A damper device that can be attached to a component on the power source side, A torque limiter unit having an annular cover plate fixed to the first axial side surface of the power source side member, A damper unit whose outer peripheral end is positioned on the second axial side of the inner peripheral end of the cover plate, and which transmits power to the power source via the torque limiter unit, A positioning structure for radially positioning the damper unit with respect to the torque limiter unit, Prepare, The cover plate has a disc-shaped friction portion and a mounting portion provided radially outward from the friction portion and attached to the power source side member. The torque limiter unit is, A friction disc is positioned on the second axial side of the friction portion of the cover plate and is pressed against the friction portion, It further possesses, The damper unit has a disc-shaped input rotating body, the input rotating body is positioned such that its outer peripheral end is located on the second axial side of the friction portion of the cover plate, and the inner peripheral portion of the friction disk is fixed to the first axial side of the outer peripheral end. The positioning structure allows the outer peripheral end surface of the friction disk to contact the cover plate of the torque limiter unit, thereby positioning the damper unit radially with respect to the torque limiter unit. The friction portion of the cover plate is offset to the first axial side with respect to the mounting portion. The cover plate further has a connecting portion that extends in the axial direction and connects the friction portion and the mounting portion, The outer peripheral end surface of the friction disk is capable of contacting the inner surface of the connecting portion. Damper device.

2. The friction disc comprises a core plate and a pair of friction members fixed to both sides of the core plate. The outer peripheral end face of the core plate protrudes radially outward from the outer peripheral end face of the pair of friction members and is capable of contacting the inner surface of the connecting portion of the cover plate. The damper device according to claim 1.

3. The input rotating body of the damper unit is A first plate, to which the inner circumferential end of the core plate is fixed to the first axial side surface of the outer circumferential end, A second plate is positioned on the second axial side of the first plate, facing the first plate, and fixed to the first plate so as not to rotate relative to it, It has, The damper device according to claim 2.

4. The damper device according to any one of claims 1 to 3, wherein the power source side member is fixed to the power source via a flexible plate.

5. A damper device that can be attached to a component on the power source side, A torque limiter unit attached to the power source side component, A damper unit that transmits power to the power source via the torque limiter unit, A positioning structure for radially positioning the damper unit with respect to the torque limiter unit, Equipped with, The torque limiter unit is, An annular cover plate having a disc-shaped friction portion, a mounting portion positioned radially outward from the friction portion and offset axially from the friction portion, and a connecting portion extending axially and connecting the friction portion and the mounting portion, A friction disc is pressed against the friction portion of the cover plate, and its outer peripheral end surface is capable of contacting the inner surface of the connecting portion, It has, The positioning structure positions the damper unit radially relative to the torque limiter unit by bringing the outer peripheral end surface of the friction disk into contact with the inner surface of the connecting portion. Damper device.

6. The damper unit has an input-side rotating body to which the inner circumference of the friction disk is fixed. The inner circumferential end of the cover plate and the outer circumferential end of the input side rotating body of the damper unit, The damper device according to claim 5, wherein the elements are arranged with an axial offset.

7. The friction disc comprises a core plate and a pair of friction members fixed to both sides of the core plate. The outer peripheral end face of the core plate protrudes radially outward from the outer peripheral end face of the pair of friction members and is capable of contacting the inner surface of the connecting portion of the cover plate. The damper device according to claim 5 or 6.

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