阅读说明：本技术 阻尼装置 (Damping device ) 是由 冨田雄亮 冈町悠介 于 2020-03-13 设计创作，主要内容包括：一种阻尼装置,在除了输入侧旋转体及输出侧旋转体之外还具备用于使多个弹性体串联动作的中间旋转体的阻尼装置中,以简单的结构产生迟滞扭矩。该阻尼装置(3)具备输入侧旋转体(20)、输出侧旋转体(21)、多个扭簧(22)、中间旋转体(23)及迟滞产生机构(24)。输入侧旋转体(20)与输出侧旋转体(21)能够相对旋转。扭簧(22)将输入侧旋转体(20)与输出侧旋转体(21)在圆周方向上弹性连接。中间旋转体(23)能够与输入侧旋转体(20)及输出侧旋转体(21)相对旋转,使至少两个扭簧串联动作。迟滞产生机构(24)具有能够与输入侧旋转体(20)、输出侧旋转体(21)及中间旋转体(23)滑动接触的摩擦部件,并产生迟滞扭矩。(A damper device, which is provided with an intermediate rotating body for serially operating a plurality of elastic bodies in addition to an input-side rotating body and an output-side rotating body, generates a hysteresis torque with a simple structure. The damping device (3) is provided with an input-side rotating body (20), an output-side rotating body (21), a plurality of torsion springs (22), an intermediate rotating body (23), and a hysteresis generating mechanism (24). The input-side rotating body (20) and the output-side rotating body (21) are capable of rotating relative to each other. The torsion spring (22) elastically connects the input-side rotating body (20) and the output-side rotating body (21) in the circumferential direction. The intermediate rotating body (23) can rotate relative to the input side rotating body (20) and the output side rotating body (21), and at least two torsion springs are operated in series. The hysteresis generating mechanism (24) has a friction member that can be in sliding contact with the input-side rotating body (20), the output-side rotating body (21), and the intermediate rotating body (23), and generates hysteresis torque.)

1. A damping device for transmitting power from a power source to an output-side member,

the damping device is provided with:

an input-side rotating body configured to be rotatable and to which power from a power source is input;

an output-side rotating body that is rotatable relative to the input-side rotating body;

a plurality of elastic members elastically connecting the input-side rotating body and the output-side rotating body in a circumferential direction;

an intermediate rotating body that is rotatable relative to the input-side rotating body and the output-side rotating body and that is configured to operate at least two of the plurality of elastic members in series; and

and a hysteresis generating mechanism having a friction member capable of sliding in contact with the input-side rotating body, the output-side rotating body, and the intermediate rotating body, and generating a hysteresis torque when the elastic member is elastically deformed.

2. Damping device according to claim 1,

the friction member of the hysteresis generating mechanism has:

a ring plate abutting against side surfaces of the output-side rotating body and the intermediate rotating body; and

a friction plate abutting against the annular plate and a side surface of the input-side rotating body,

the hysteresis generating mechanism further includes a biasing member that presses the annular plate against the side surfaces of the output-side rotating body and the intermediate rotating body, and presses the friction plate against the side surface of the annular plate.

3. Damping device according to claim 2,

the ring plate is fixed to the output-side rolling body,

the friction plate is fixed to the input-side rotating body.

4. A damping device according to one of the claims 1 to 3,

the output-side rotating body includes:

a hub connected to the output-side member; and

a plurality of flanges provided to extend radially outward from the hub and arranged at predetermined intervals in a circumferential direction,

the intermediate rotating body includes:

an annular portion; and

an intermediate flange provided to extend radially outward from the annular portion and arranged at least at one location between the plurality of flanges of the output-side rotating body in the circumferential direction so as to serially operate at least two of the plurality of elastic members,

the friction member abuts against side surfaces of the plurality of flanges and the intermediate flange.

5. Damping device according to claim 4,

the hysteresis generating mechanism is disposed between the hub of the output-side rotating body and the elastic member in the radial direction.

Technical Field

The present invention relates to a damper device, and more particularly to a damper device for transmitting power from a power source to an output-side member.

Background

Various devices are mounted in a drive system of a vehicle in order to transmit power generated by an engine to a transmission. As such a device, for example, a damping device, a flywheel assembly, etc. are considered. In these devices, a damping mechanism as shown in patent document 1 is used for the purpose of damping rotational vibration.

The damper device of patent document 1 includes an input plate, an output plate, a plurality of springs, and an intermediate plate. The output plate is configured to be rotatable relative to the input plate. In addition, the middle plate is clamped on the low-rigidity spring and the high-rigidity spring, and the low-rigidity spring and the high-rigidity spring are connected in series.

Further, patent document 2 discloses a damper device of a type in which an output shaft hub connected to an output side rotating body is separated from an intermediate plate. In the device of patent document 2, friction members for generating a hysteresis torque are disposed between the input-side rotating body and the output shaft hub, and between the input-side rotating body and the intermediate plate, respectively.

Disclosure of Invention

Technical problem to be solved by the invention

In the damper device, in order to obtain good vibration damping performance, it is necessary to generate an appropriate hysteresis torque between the input plate and the output plate or between these plates and the intermediate plate. However, as shown in patent document 2, if a mechanism for generating a hysteresis torque is provided between the plates that rotate relative to each other, the structure becomes complicated, and this hinders the miniaturization of the device.

The present invention is directed to generating a hysteresis torque with a simple configuration in a damper device including an intermediate rotating body for operating a plurality of elastic bodies in series in addition to an input-side rotating body and an output-side rotating body.

Means for solving the technical problem

(1) The present invention relates to a damper device for transmitting power from a power source to an output-side member. The damper device includes an input-side rotating body, an output-side rotating body, a plurality of elastic members, an intermediate rotating body, and a hysteresis generating mechanism. The input-side rotating body is arranged to be rotatable and to which power from a power source is input. The output-side rotating body is rotatable relative to the input-side rotating body. The plurality of elastic members elastically connect the input-side rotating body and the output-side rotating body in the circumferential direction. The intermediate rotating body is capable of rotating relative to the input-side rotating body and the output-side rotating body, and at least two of the plurality of elastic members are operated in series. The hysteresis generating mechanism has a friction member that can be brought into sliding contact with the input-side rotating body, the output-side rotating body, and the intermediate rotating body, and generates hysteresis torque when the elastic member is elastically deformed.

In this device, when power is input to the input-side rotating body, the power is transmitted from the input-side rotating body to the output-side rotating body via the elastic member. When relative rotation occurs between the input-side rotating body, the output-side rotating body, and the intermediate rotating body during operation, a hysteresis torque is generated by the hysteresis generating mechanism. By this hysteresis torque generating mechanism, vibration caused by rotational fluctuation is damped.

Here, the friction member of the hysteresis generating mechanism is in sliding contact with the input-side rotating body, the output-side rotating body, and the intermediate rotating body, thereby generating a hysteresis torque between the rotating bodies. That is, it is easy to obtain an appropriate hysteresis torque by a simple mechanism.

(2) Preferably, the friction member of the hysteresis generating mechanism has a circular ring plate and a friction plate. The annular plate abuts against side surfaces of the output-side rotating body and the intermediate rotating body. The friction plate abuts against the annular plate and a side surface of the input-side rotating body. Preferably, the hysteresis generating mechanism further includes a biasing member that presses the annular plate against the side surfaces of the output-side rotating body and the intermediate rotating body and presses the friction plate against the side surface of the annular plate.

Here, since the annular plate is pressed against the side surfaces of the output-side rolling element and the intermediate rolling element, a hysteresis torque is generated between the annular plate and the output-side rolling element or the intermediate rolling element. Further, since the friction plate is pressed against the side surfaces of the ring plate and the input-side rotor, a hysteresis torque is generated between the friction plate and the ring plate or the input-side rotor.

(3) Preferably, the annular plate is fixed to the output-side rotating body, and the friction plate is fixed to the input-side rotating body.

In this case, a hysteresis torque is generated between the annular plate and the intermediate rotating body, and a hysteresis torque is generated between the friction plate and the annular plate.

(4) Preferably, the output-side rolling body has a hub and a plurality of flanges. The hub is connected to the output side member. The plurality of flanges are provided to extend radially outward from the hub and are arranged at predetermined intervals in the circumferential direction. Preferably, the intermediate rotating body has an annular portion and an intermediate flange. The intermediate flange is provided to extend radially outward from the annular portion. The intermediate flange is disposed at least at one position between the plurality of flanges of the output-side rotating body in the circumferential direction, and at least two of the plurality of elastic members are operated in series. Further, it is preferable that the friction member abuts against side surfaces of the plurality of flanges and the intermediate flange.

(5) Preferably, the hysteresis generating mechanism is disposed between the hub of the output-side rotating body and the elastic member in the radial direction.

ADVANTAGEOUS EFFECTS OF INVENTION

In the above-described aspect of the invention, in the damper device including the intermediate rotating body for operating the plurality of elastic bodies in series in addition to the input-side rotating body and the output-side rotating body, the hysteresis torque can be generated between the respective rotating bodies with a simple configuration.

Drawings

Fig. 1 is a sectional view of a power transmission device including a damper device according to an embodiment of the present invention.

Fig. 2 is a diagram extracted and shown from the torque limiting device of fig. 1.

Fig. 3 is a diagram of the damper device of fig. 1 extracted and shown.

Fig. 4 is a diagram showing the hysteresis generating mechanism of fig. 1.

Fig. 5 is a front view showing a part of the damper device of fig. 1 removed.

Fig. 6 is an external view of the hysteresis generating mechanism.

Fig. 7 is a diagram showing the magnitude of vibration caused by resonance of the intermediate rotating body and the magnitude of vibration in the present embodiment.

Detailed Description

Fig. 1 is a sectional view of a power transmission device 1 including a damper device according to an embodiment of the present invention, and fig. 2 is a front view of the power transmission device with a part of the power transmission device removed. The power transmission device 1 is mounted on, for example, a hybrid vehicle. The power transmission device 1 includes a torque limiter device 2 and a damper device 3 to which power from the engine is input through the torque limiter device 2. The engine is disposed on the right side of fig. 1, and the motor, the transmission, and the like are disposed on the left side. The line O-O of FIG. 1 is the axis of rotation.

[ Torque-limiting device 2]

The torque limiter apparatus 2 is connected to a flywheel 4 to which power is input from the engine. Further, for example, when an excessive torque is input from the output side, the transmitted torque is limited to a predetermined value or less so as not to be transmitted to the engine side. The torque limiting device 2 has a cover 10, a damping plate 11, a friction disc 12, a pressure plate 13, and a conical spring 14. The friction disk 12, the pressure plate 13, and the conical spring 14 are housed inside the cover 10.

Fig. 2 shows the torque limiting device 2 in an enlarged manner. The lid 10 includes a connecting portion 10a, a cylindrical portion 10b, and a support portion 10 c. The connecting portion 10a, the cylindrical portion 10b, and the supporting portion 10c are integrally formed by press forming. Therefore, the cylindrical portion 10b has a gradient formed by drawing, and is inclined toward the inner peripheral side as it is separated from the flywheel 4. Further, a curved portion 10d is formed between the cylindrical portion 10b and the support portion 10 c.

The connecting portion 10a is formed in a ring shape, and is connected to the flywheel 4 via the damper plate 11 by a bolt 15. The cylindrical portion 10b extends from the inner peripheral end of the connecting portion 10a to the output side (the side away from the flywheel 4). The support portion 10c is annular and extends from the front end of the cylindrical portion 10b to the inner circumferential side with a predetermined width. An annular support protrusion 10e protruding toward the flywheel 4 is formed at a radially intermediate portion of the support portion 10 c.

The damper plate 11 is formed in a ring shape and has a plurality of holes 11a in an outer peripheral portion thereof. The damper plate 11 is fixed to the side surface of the flywheel 4 together with the cover 10 by bolts 15 penetrating the holes 11 a. The damping plate 11 has an outer diameter equal to that of the flywheel 4 and an inner diameter smaller than that of a friction material (described later) of the friction disk 12.

The friction disc 12 has a core plate 17 and a pair of friction materials 18. The core plate 17 is formed in a ring shape and has a plurality of fixing portions 17a extending further radially inward from an inner peripheral end. The core plate 17 is connected to the damper device 3 through the fixing portion 17 a. The pair of friction members 18 are formed in a ring shape and fixed to both side surfaces of the core plate 17.

The pressure plate 13 is formed in an annular shape and is disposed to face the damping plate 11 through the friction disk 12. That is, the friction disk 12 is sandwiched between the damping plate 11 and the pressure plate 13. The inner diameter of the pressure plate 13 is smaller than the inner diameter of the friction material 18 of the friction disc 12.

The conical spring 14 is disposed in a compressed state between the pressure plate 13 and the support portion 10c of the lid portion 10. The outer peripheral portion of the conical spring 14 is supported by the supporting projection 10e of the supporting portion 10c, and the inner peripheral end abuts against the pressure plate 13, thereby pressing the pressure plate 13 against the flywheel 4 side.

With such a torque limiter device 2, when the torque transmitted between the engine side and the damper device 3 exceeds the torque transmission capacity set by the torque limiter device 2, a slip occurs at a portion of the friction disk 12, and the transmitted torque is limited.

In the torque limiter device 2, the cylindrical portion 10b of the lid portion 10 has a gradient on the inner peripheral side as it is separated from the flywheel 4. Therefore, the diameter of the inner circumferential surface of the output-side end of the cylindrical portion 10b is smaller than that of the flywheel 4-side end. In addition, a curved surface portion 10d is formed at an end portion of the cylindrical portion 10 b. Therefore, if the friction disk 12 is disposed on the support portion 10c side, a large diameter of the friction disk 12 cannot be secured.

However, in the present embodiment, since the friction disk 12 is disposed on the flywheel 4 side inside the cover portion 10, the diameter of the friction disk 12 can be made larger without being affected by the gradient of the cylindrical portion 10 b. Conversely, the diameter of the torque limiter device 2 having the same torque transmission capacity can be made small.

In the present embodiment, the friction disk 12 is arranged so as to be pressed against the flywheel 4 via the damping plate 11. In contrast to the present embodiment, if the friction disk 12 is disposed on the support portion 10c side of the cover 10 and the conical spring 14 is disposed on the flywheel 4 side, the inner peripheral side of the support portion 10c of the cover 10 is elastically deformed so as to open outward. In this way, the friction material 18 of the friction disk 12 may not be uniformly in contact with the support portion 10c, and a desired torque capacity may not be obtained or the friction material 18 may be abnormally worn. In order to avoid such a disadvantage, the plate member constituting the lid 10 needs to be thick.

However, in this embodiment, since the friction disk 12 is disposed on the flywheel 4 side and the conical spring 14 is disposed on the support portion 10c side of the cover portion 10, the surface (the side surface of the damper plate 11) in contact with the friction disk 12 is less likely to be deformed. Therefore, the entire friction material 18 of the friction disk 12 uniformly contacts the damping plate 11, and a stable torque capacity can be obtained. In addition, abnormal wear of the friction material 18 of the friction disk 12 can be suppressed.

Here, in the present embodiment, the support portion 10c of the cover portion 10 is also elastically deformed, but this elastic deformation acts as a force that presses the friction disk 12 together with the biasing force of the conical spring 14. Therefore, the thickness of the plate member constituting the lid portion 10 can be reduced. Therefore, the torque limiter device 2 can be downsized in the axial direction.

In addition, in the torque limiter apparatus 2 having the above-described configuration, the torque limiter apparatus 2 can be easily mounted even to a general-purpose flywheel, that is, a flywheel having no special shape for mounting a torque limiter.

[ damping device 3]

The damper device 3 transmits the power from the torque limiter device 2 to the output side, and damps vibration during power transmission. The damping device 3 is extracted and shown in fig. 3. The damper device 3 includes an input-side rotating body 20, an output-side rotating body 21, a plurality of torsion springs 22, an intermediate rotating body 23, and a hysteresis generating mechanism 24.

< input-side rotating body 20 >

The input-side rotating body 20 is rotatable about a rotation axis and includes a first plate 31 and a second plate 32.

The first plate 31 has a circular plate portion 31a, a plurality of first window portions 31b for holding the torsion springs 22, a plurality of bent portions 31c, and a plurality of fixing portions 31d (see fig. 4). Fig. 4 shows a cross section at a different circumferential position from fig. 1 of the damping device 3. The first plate 31 is positioned in the radial direction by the inner peripheral surface of the circular plate portion 31a and the outer peripheral surface of a cylindrical hub (described later) of the output-side rotator 21.

The first window 31b is formed in the outer peripheral portion of the disc portion 31 a. The first window portion 31b has a long hole in the circumferential direction that penetrates in the axial direction, and a holding portion that is formed on the inner and outer peripheries of the hole and holds the torsion spring 22. An end surface of the hole in the circumferential direction can abut against an end surface of the torsion spring 22.

The bent portion 31c has an L-shaped cross section and is formed by bending the outer peripheral end of the circular plate portion 31a toward the flywheel 4. The rotation strength of the first plate 31 is improved by bending the outer peripheral end of the circular plate portion 31a into an L-shaped cross section.

As shown in fig. 4 and 5, the fixing portion 31d is formed by further bending the distal end of the bent portion 31c radially inward at the center portion of the bent portion 31c in the circumferential direction. Further, fig. 5 is a front view showing a part of the dismounting device. The fixing portion 31d is formed with a hole 31e for rivet fixing. Further, a hole 31f for rivet fastening is formed at the same position as the hole 31e for rivet fixing of the disk portion 31 a.

The second plate 32 is disposed opposite to the first plate 31 in the axial direction on the flywheel 4 side of the first plate 31. The second plate 32 is formed in a disc shape and has a plurality of second windows 32 b. The second plate 32 is positioned in the radial direction by its inner peripheral surface and an outer peripheral surface of a cylindrical hub (described later) of the output-side rotating body 21.

The second window portion 32b is formed at a position corresponding to the first window portion 31b of the first plate 31. The second window portion 32b has a long hole in the circumferential direction that penetrates in the axial direction, and a holding portion that is formed on the inner and outer peripheries of the hole and holds the torsion spring 22. The end surface of the hole in the circumferential direction can abut against the end surface of the torsion spring. The torsion spring 22 is held by the second window portion 32b and the first window portion 31b of the first plate 31.

The second plate 32 has a hole 32e for rivet fixing at the same position as the hole 31e for rivet fixing of the first plate 31. The first plate 31 and the second plate 32 are fixed so as not to move in the axial direction and the circumferential direction by the rivet 33 passing through the rivet fixing holes 31e and 32e of the plates 31 and 32. Further, the fixing portion 17a of the core plate 17 of the friction disk 12 is inserted between the fixing portion 31d of the first plate 31 and the second plate 32, whereby the first plate 31 and the second plate 32 are fixed to the friction disk 12.

< output side rotary body 21 >

The output-side rotating body 21 is disposed between the first plate 31 and the second plate 32 in the axial direction. The output-side rotary body 21 is rotatable about the rotation axis and is rotatable relative to the first plate 31 and the second plate 32. The output-side rolling body 21 has a hub 35 and three flanges 36.

The hub 35 is disposed in the center of the output side rotor 21 and has a cylindrical shape. The inner peripheral portion is formed with a spline hole 35a, and the spline hole 35a is spline-connected to a shaft (not shown) formed on the output side. As described above, the first and second plates 31 and 32 are positioned radially with respect to the hub 35 by the outer peripheral surface of the hub 35 and the inner peripheral surfaces of the first and second plates 31 and 32.

Three flanges 36 are formed to radially extend from the outer peripheral surface of the hub 35. The three flanges 36 are arranged at equal angular intervals in the circumferential direction. The flange 36 has a hysteresis mechanism mounting portion 36a, a first support portion 36b, and a second support portion 36 c. The hysteresis mechanism mounting portion 36a is a flat surface and is formed on the outer peripheral side of the hub 35. The first support portion 36b extends radially outward from the hysteresis mechanism mounting portion 36a, and has a smaller width in the circumferential direction than the hysteresis mechanism mounting portion 36 a. The spring seats 38 abut against both end surfaces in the circumferential direction of the first support portion 36 b. The second support portion 36c is formed by extending both end portions of the outer peripheral end of the first support portion 36b in the circumferential direction. The inner peripheral surface of the second support portion 36c abuts against the spring seat 38.

The second support portion 36c is disposed at the same position in the radial direction as the fixing portion 31d of the first plate 31. The second support portion 36c is formed with a hole 36d penetrating in the axial direction. The first plate 31 and the second plate 32 are riveted through the hole 36d and the rivet hole 31f of the first plate 31.

< torsion spring 22 >

The torsion spring 22 is accommodated between the plurality of flanges 36 of the output side rotating body 21 in the circumferential direction, and is held by the first window portion 31b and the second window portion 32b of the first plate 31 and the second plate 32. Two torsion springs 22 are disposed between the adjacent flanges 36, and spring seats 38 are disposed on both end surfaces of each torsion spring 22.

< intermediate rotating body 23 >

The intermediate rotating body 23 is rotatable about the rotation axis and is rotatable relative to the first plate 31, the second plate 32, and the output-side rotating body 21. The intermediate rotating body 23 is a member for operating the two torsion springs 22 arranged between the adjacent flanges 36 in series. The intermediate rotating body 23 has an annular portion 40 and three intermediate flanges 41.

The inner peripheral portion of the annular portion 40 is inserted into the outer periphery of the hub 35 of the output side rotating body 21. That is, the intermediate rotating body 23 is positioned in the radial direction with respect to the output side rotating body 21 by being in contact with the inner peripheral surface of the annular portion 40 and the outer peripheral surface of the hub 35. The annular portion 40 is arranged axially parallel to the flange 36 on the flywheel 4 side of the hub 35 of the output-side rotating body 21.

The three intermediate flanges 41 have an offset portion 41a, a friction portion 41b, a first support portion 41c, a second support portion 41d, and a stopper portion 41 e.

As shown in fig. 3 and 5, the offset portion 41a is a portion connecting the annular portion 40 and the friction portion 41 b. Here, both side surfaces of the friction portion 41b are at the same axial direction positions as both side surfaces of the flange 36 of the output side rotator 21. That is, the friction portion 41b and the side surface of the flange 36 of the output-side rotator 21 on the flywheel 4 side are located on one plane. In addition, the friction portion 41b and the output-side surface of the flange 36 of the output-side rotator 21 are located on one plane. The offset portion 41a is connected to the annular portion 40 and the friction portion 41b at different positions in the axial direction.

The first support portion 41c extends radially outward from the friction portion 41b, and has a smaller width in the circumferential direction than the friction portion 41 b. The spring seat 38 abuts on both end surfaces in the circumferential direction of the first support portion 41 c. The second support portion 41d is formed by extending both end portions of the outer peripheral end of the first support portion 41c in the circumferential direction. The spring seat 38 abuts against the inner peripheral surface of the second support portion 41 d.

The stopper 41e is formed at the circumferential center of the outer peripheral surface of the first support portion 41c and projects radially outward. The stopper 41e is disposed at the center in the circumferential direction of the adjacent bent portion 31c of the first plate 31. Further, the end surface of the stopper portion 41e in the circumferential direction can abut against the end surface of the bent portion 31c in the circumferential direction.

That is, the relative rotation angle of the input side rotary body 20 and the intermediate rotary body 23 (or even the output side rotary body 21) is restricted within a predetermined angular range by the bent portion 31c of the first plate 31 and the stopper portion 41e of the intermediate rotary body 23.

[ hysteresis generating mechanism 24]

The hysteresis generating mechanism 24 is disposed radially between the hub 35 of the output-side rotator 21 and the torsion spring 22. The flange 36 of the output-side rotating body 21 (specifically, the hysteresis mechanism mounting portion 36a) and the intermediate flange 41 of the intermediate rotating body 23 (specifically, the friction portion 41b) are disposed between the first plate 31 and between the flange 36 of the output-side rotating body 21 and the intermediate flange 41 of the intermediate rotating body 23 and the second plate 32 in the axial direction.

As shown in fig. 4 and 6, the hysteresis generating mechanism 24 has two annular plates 45, two friction plates 46, and a conical spring 47. Since the two annular plates 45 and the two friction plates 46 are different only in size, the respective plates 45, 46 on the first plate 31 side will be described here. Fig. 6 is a diagram showing the output-side rotating body 21, the intermediate rotating body 23, and a hysteresis generating mechanism 24 with parts removed.

The annular plate 45 is formed in an annular shape and abuts against side surfaces of the output-side rotating body 21 and the intermediate rotating body 23. The annular plate 45 is fixed to the hysteresis mechanism mounting portion 36a of the output side rotating body 21. Therefore, the annular plate 45 cannot rotate relative to the output-side rotating body 21, but can rotate relative to the intermediate rotating body 23. Although not described in detail here, the annular plate 45 is fixed to the output-side rotating body 21 by rivets or the like, for example, with a plurality of fixing portions provided so as to protrude toward the inner peripheral side.

The friction plate 46 is formed in a ring shape, and a side surface on the flywheel side abuts against the annular plate 45 while the other surface abuts against the first plate 31. The friction plate 46 has a plurality of engaging projections 46a formed on the surface thereof on the first plate 31 side and projecting in the axial direction. The engaging projection 46a is engaged with a hole 31g formed in the first plate 31. Thus, the friction plate 46 cannot rotate relative to the first plate 31, but can rotate relative to the annular plate 45.

As described above, the annular plate 45 and the friction plate 46 on the second plate 32 side have the same structure. The conical spring 47 is mounted in a compressed state between the friction plate 46 on the second plate 32 side and the second plate 32.

With the above configuration, when the input-side rotor 20 and the output-side rotor 21 rotate relative to each other and the torsion spring 22 expands and contracts, frictional resistance (hysteresis torque) is generated between the friction plate 46 and the annular plate 45. When the torsion spring 22 expands and contracts and the output-side rotator 21 and the intermediate rotator 23 rotate relative to each other, a hysteresis torque is similarly generated. That is, the hysteresis generating mechanism 24 includes a hysteresis generating section 24a (see fig. 4) that generates a hysteresis torque between the input-side rotator 20 and the output-side rotator 21, and a hysteresis generating section 24b (see fig. 3) that applies a hysteresis torque to the intermediate rotator 23.

[ actions ]

The power transmitted from the engine to the flywheel 4 is input to the damping device 3 through the torque limiting device 2. In the damper device 3, power is input to the first and second plates 31, 32 of the torque limiter device 2 to which the friction disk 12 is fixed, and the power is transmitted to the output side rotating body 21 via the torsion spring 22. Then, the power is further transmitted from the output side rotation body 21 to the output side motor, generator, transmission, and the like.

Further, for example, at the time of engine start, an excessive torque may be transmitted from the output side to the engine because the inertia amount on the output side is large. In this case, the torque transmitted to the engine side through the torque limiting device 2 is limited to a predetermined value or less.

In the damper device 3, when power is transmitted from the first and second plates 31 and 32 to the torsion spring 22, the torsion spring 22 is compressed. In addition, the torsion spring 22 repeatedly expands and contracts due to the fluctuation of the torque. When the torsion spring 22 expands and contracts, torsion occurs between the first and second plates 31 and 32 and the output-side rotating body 21.

The hysteresis generating mechanism 24 is operated by the torsion between the first and second plates 31 and 32 and the output-side rotator 21 to generate a hysteresis torque. Specifically, relative rotation occurs between the friction plate 46 fixed to the first and second plates 31 and 32 and the annular plate 45 fixed to the output-side rotating body 21, and frictional resistance occurs between these members. Thereby, a hysteresis torque is generated between the first and second plates 31 and 32 and the output-side rolling element 21.

Further, torsion is also generated between the output-side rotator 21 and the intermediate rotator 23 due to the extension and contraction of the torsion spring 22. Due to this twisting, relative rotation is generated between the annular plate 45 fixed to the output side rotary body 21 and the friction portion 41b of the intermediate rotary body 23, and frictional resistance is generated between these members. This generates a hysteresis torque between the output-side rotator 21 and the intermediate rotator 23.

There is a large vibration of the intermediate rotating body 23 due to resonance according to the number of revolutions of the engine. However, in this embodiment, the large-amplitude vibration caused by the resonance of the intermediate rotating body 23 can be suppressed by the hysteresis torque between the output side rotating body 21 and the intermediate rotating body 23.

Fig. 7 is a diagram showing the magnitude of the vibration of the intermediate rotating body 23. The broken line M in fig. 7 indicates a case where the hysteresis torque is not applied to the intermediate rotating body 23, and the solid line M in the same figure indicates a case where the hysteresis torque is applied to the intermediate rotating body 23. As is clear from this figure, the magnitude of vibration caused by resonance can be suppressed by applying a hysteresis torque to the intermediate rotating body 23.

When the torsion angles of the first and second plates 31 and 32 with the output-side rotating body 21 and the intermediate rotating body 23 become larger, the end surface of the bent portion 31c of the first plate 31 comes into contact with the end surface of the stopper portion 41e of the intermediate rotating body 23. Therefore, the torsion angles of the first and second plates 31 and 32 with the output-side rotating body 21 and the intermediate rotating body 23 can be suppressed from becoming equal to or larger than a predetermined angle. Therefore, excessive stress can be prevented from being applied to the torsion spring 22.

[ other embodiments ]

The present invention is not limited to the above embodiment, and various modifications and changes can be made without departing from the scope of the present invention.

(a) Although the annular plate 45 and the friction plate 46 are provided in the hysteresis generating mechanism 24 in the above embodiment, the friction plate may be in direct contact with the output-side rotator 21 and the intermediate rotator 23.

(b) Although the annular plate 45 is fixed to the output-side rolling element 21 in the above-described embodiment, it may be fixed to the intermediate rolling element 23 so that a hysteresis torque is generated between the annular plate and the output-side rolling element.

Description of the reference numerals

3 … damping means; 20 … input side rotator; 21 … output side rotating body; 22 … torsion spring; 23 … intermediate rotating body; 24 … hysteresis generation mechanism; 35 … a hub; 36 … flanges; 40 … ring portion; 41 … intermediate flange; 45 … circular ring plates; 46 … friction plates; 47 … conical spring.