Vibration damping device

Abstract

A vibration damping device has a restriction hole of a restricting mechanism formed to be long in the circumferential direction. The vibration damping device (1) includes: an input side plate (21), a hub flange (22), a plurality of helical springs (27), and a restricting mechanism (25). The restricting mechanism (25) has a first restriction hole (26a) and a second restriction hole (26b), and a plurality of restriction pins (24). Each of the restriction holes (26a), (26b) is formed to extend in the circumferential direction on both sides in the circumferential direction of a first window hole (22a) of the hub flange (22), one end portion communicating with the first window hole (22a), and the other end portion extending to the radially outer side of a second window hole (22b) of the hub flange (22). The restriction pins (24) are fixed to the input side plate (21), axially penetrate through each of the restriction holes (26a), (26b), and are capable of moving in the circumferential direction within each of the restriction holes (26a), (26b).

Description

Technical Field

[0001] The present invention relates to a vibration damping device. Background Art

[0002] In order to transmit the power generated by an engine to the transmission side and attenuate rotational fluctuations, a power transmission device having a vibration damping device is mounted on a vehicle.

[0003] Such a vibration damping device has an input rotating body, an output rotating body, and a plurality of coil springs. The coil springs are disposed in a window portion of the input rotating body and a window hole of the output rotating body, and elastically connect the input rotating body and the output rotating body in the rotational direction.

[0004] In addition, as shown in Patent Document 1, in order to restrict the relative rotation between the input rotating body and the output rotating body, a limiting mechanism is provided in the vibration damping device. The limiting mechanism has a plurality of limiting pins and notches. The limiting pins are fixed to the input rotating body and pass through notches formed in the output rotating body.

[0005] In Patent Document 1, as the notch constituting the limiting mechanism, a notch that opens toward the outer peripheral side is formed. As another configuration, a configuration is also provided in which a hole for limiting formed in an arc shape is formed and the limiting pin passes through the hole for limiting.

[0006] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2004-197781

[0007] Here, in order to improve the rotational fluctuation performance of the vibration damping device, it is preferable to widen the torsional angle of the output rotating body with respect to the input rotating body (that is, to widen the angle). In order to achieve this widening, it is necessary to ensure a long length of the notch or the hole for limiting in the circumferential direction of the output rotating body.

[0008] However, in the output rotating body, notches including the hole for limiting and window holes are mostly arranged at positions that overlap in the radial direction. Therefore, the hole for limiting cannot be formed to be long. Summary of the Invention

[0009] A technical problem of the present invention is to enable the hole for limiting constituting the limiting mechanism to be formed long in the circumferential direction in the vibration damping device.

[0010] (1) The damping device according to the present invention includes: a first rotating body, a second rotating body, a plurality of elastic members, and a limiting mechanism. The first rotating body has a plurality of first window portions and a plurality of second window portions, and the plurality of first window portions are arranged at positions radially outside the plurality of second window portions. The second rotating body is arranged to be rotatable relative to the first rotating body, and has a plurality of first window holes and a plurality of second window holes, and the plurality of first window holes are arranged at positions radially outside the plurality of second window holes. The plurality of elastic members are accommodated in the first window portions and the first window holes and the second window portions and the second window holes, and elastically connect the first rotating body and the second rotating body in the rotational direction. The limiting mechanism limits the relative rotational angle between the first rotating body and the second rotating body within a specified angular range.

[0011] In addition, the limiting mechanism has a first limiting hole, a second limiting hole, and a plurality of limiting members. The first limiting hole is formed to extend in the circumferential direction on one side of the circumferential direction of the first window hole of the second rotating body. One end portion of the first limiting hole close to the first window hole communicates with the first window hole, and the other end portion of the first limiting hole far from the first window hole extends to the radially outside of the second window hole. The second limiting hole is formed to extend in the circumferential direction on the other side of the circumferential direction of the first window hole of the second rotating body. The plurality of limiting members are fixed to the first rotating body, axially penetrate the first limiting hole and the second limiting hole, and can move in the circumferential direction within the first limiting hole and the second limiting hole.

[0012] In this damping device, one end portion of the first limiting hole communicates with the first window hole, and the other end portion extends to the radially outside of the second window hole. Therefore, the circumferential length of the first limiting hole can be increased. That is, the operating range of the limiting mechanism can be expanded, and the relative rotational angle (torsion angle) of the first rotating body and the second rotating body in one direction with respect to each other can be widened.

[0013] (2) Preferably, one end portion of the second limiting hole close to the first window hole communicates with the first window hole, and the other end portion of the second limiting hole far from the first window hole extends to the radially outside of the second window hole.

[0014] In this case, similar to the first limiting hole, the circumferential length of the second limiting hole can also be increased, and the torsion angle of the first rotating body and the second rotating body in the other direction with respect to each other can be widened.

[0015] (3) Preferably, the first limiting hole and the second limiting hole are formed in an arc shape with the same pitch radius.

[0016] (4) Another aspect of the present invention relates to a damping device including: a first rotating body, a second rotating body, a plurality of first elastic members, and a limiting mechanism. The first rotating body has a plurality of first window portions. The second rotating body is arranged to be rotatable relative to the first rotating body and has a plurality of first window holes. The plurality of first elastic members are received in the first window portions and the first window holes and elastically connect the first rotating body and the second rotating body in the rotational direction. The limiting mechanism limits the relative rotational angle between the first rotating body and the second rotating body within a specified angular range.

[0017] In addition, the limiting mechanism includes: a first limiting hole, a second limiting hole, and a limiting member. The first limiting hole is separated from the first window hole on one side in the circumferential direction of the first window hole and is formed in an arc shape having a first pitch radius. The second limiting hole is formed in an arc shape having a second pitch radius smaller than the first pitch radius on the other side in the circumferential direction of the first window hole, and an end portion of the second limiting hole closer to the first window hole communicates with the first window hole. The plurality of limiting members are fixed to the first rotating body, axially penetrate through the first limiting hole and the second limiting hole, and are capable of moving in the circumferential direction within the first limiting hole and the second limiting hole.

[0018] Here, the first limiting hole is formed to be separated from the first window hole. That is, the first limiting hole does not communicate with the first window hole. Therefore, compared with a structure in which the first limiting hole communicates with the first window hole, a reduction in strength can be suppressed. In addition, since the first limiting hole is formed in an arc shape having a relatively large first pitch radius, the length in the circumferential direction can be increased. Therefore, the operating range of the limiting mechanism can be expanded, and the relative rotational angle (twisting angle) between the first rotating body and the second rotating body in one direction can be widened.

[0019] On the other hand, one end portion of the second limiting hole communicates with the first window hole. Therefore, the length in the circumferential direction of the second limiting hole can be increased, and the relative rotational angle (twisting angle) between the first rotating body and the second rotating body in the other direction can be widened.

[0020] In addition, by changing the pitch radius of the first limiting hole and the pitch radius of the second limiting hole, the two limiting holes separated by the first window hole can be made to approach each other. That is, for example, in the case where a pair of first limiting holes and a pair of second limiting holes are formed, the angle formed by the rotation axis and the limiting pins separated by the first window hole can be made to approach 90°, and uneven strength of the second rotating body can be suppressed.

[0021] (5) Preferably, the first rotating body has a plurality of second window portions formed at a position radially inward of the plurality of first window portions. Further preferably, the second rotating body has a plurality of second window holes formed at a position radially inward of the plurality of first window holes. In this case, a plurality of second elastic members are further provided, and the plurality of second elastic members are received in the plurality of second window portions and the plurality of second window holes and elastically connect the first rotating body and the second rotating body in the rotational direction. In addition, the end portions of the first limiting hole and the second limiting hole on the side away from the first window hole extend to the radially outer side of the second window hole.

[0022] In this case, the second window portions and the second window holes are arranged offset in the radial direction from the first window portions and the first window holes. In addition, one end portion of the first limiting hole and the second limiting hole extends to the radially outer side of the second window hole, so that the circumferential length of the two limiting holes can be increased.

[0023] (6) Preferably, the first window hole has a pair of pressing surfaces at both end portions in the circumferential direction, and the pressing surface on the side closer to the first limiting hole among the pair of pressing surfaces has a protruding portion protruding in a manner of bulging toward the opposite pressing surface. In this case, the end portion of the first limiting hole on the side closer to the first window hole extends toward the protruding portion.

[0024] Here, one end portion of the first limiting hole can be extended to a degree that reaches deep into the protruding portion of the first window hole. Therefore, the circumferential length of the first limiting hole can be further increased.

[0025] Advantages of the Invention

[0026] With the present invention as described above, in the vibration damping device, the limiting holes constituting the limiting mechanism can be formed to be relatively long in the circumferential direction, and good rotational fluctuation attenuation performance can be obtained. Description of the Drawings

[0027] Figure 1 is a cross-sectional view of a vibration damping device with a torque limiter according to a first embodiment of the present invention.

[0028] Figure 2 is Figure 1 a front view of the vibration damping unit of the vibration damping device.

[0029] Figure 3 is Figure 1 a front view of the flange.

[0030] Figure 4 is a torsional characteristic diagram of the vibration damping device according to the first embodiment.

[0031] Figure 5 is equivalent to that of a second embodiment of the present invention Figure 2 a view.

[0032] Figure 6 is Figure 5 the front view of the flange.

[0033] Figure 7 is equivalent to that of the third embodiment of the present invention Figure 2 figure.

[0034] Figure 8 is Figure 7 the front view of the flange.

[0035] Figure 9 is the side view of the spring seat of the third embodiment.

[0036] Figure 10 is Figure 9 the sectional view taken along the line X-X of.

[0037] Explanation of reference numerals

[0038] 1: Vibration damping device; 21: Input side plate (first rotating body); 21a: First window portion; 21b: Second window portion; 22: Hub flange (second rotating body); 222, 40, 50: Flange; 22a, 41a, 51a: First window hole; 22b, 41b, 51b: Second window hole; 24: Stop pin; 25: Stop mechanism; 26a, 26b, 42a, 42b, 52a, 52b: Stop holes; 27: Helical spring (elastic member); 28: Resin member (elastic member); 51e: Protrusion. Detailed description of the embodiments

[0039] - First embodiment

[0040] [Overall configuration]

[0041] Figure 1 is a sectional view of a vibration damping device 1 with a torque limiter (hereinafter simply referred to as "vibration damping device") according to an embodiment of the present invention. In addition, Figure 2 is the front view of the vibration damping device 1, which is shown in a manner of removing a part of the components or deleting a part of the components. In Figure 1 , the line O-O is the rotation axis. In Figure 1 , an engine is arranged on the left side of the vibration damping device 1, and a drive unit including a motor, a speed change device, etc. is arranged on the right side.

[0042] It should be noted that in the following description, the axial direction is the direction in which the rotation axis O of the vibration damping device 1 extends. In addition, 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. It should be noted that the circumferential direction does not need to be completely consistent with the circumferential direction of the circle centered on the rotation axis O. For example, it also includes Figure 2The concept of the left - right direction based on the window portion and the window hole shown in the upper part of. In addition, the radial direction does not need to be exactly the same as the diameter direction of the circle centered on the rotation axis O. For example, it also includes Figure 2 The concept of the up - down direction based on the window portion and the window hole shown in the upper part of.

[0043] The vibration damping device 1 is provided between a flywheel (not shown) and the input shaft of the drive unit, and is a device for restricting the torque transmitted between the engine and the drive unit and attenuating rotational fluctuations. The vibration damping device 1 has a torque limiting unit 10 and a vibration damping unit 20.

[0044] [Torque Limiting Unit 10]

[0045] The torque limiting unit 10 is arranged on the outer peripheral side of the vibration damping unit 20. The torque limiting unit 10 restricts the torque transmitted between the flywheel and the vibration damping unit 20. The torque limiting unit 10 has a first side plate 11, a second side plate 12, a friction disk 13, a pressure plate 14, and a conical spring 15.

[0046] The first side plate 11 and the second side plate 12 are fixed to each other by a plurality of rivets. The friction disk 13 has a core plate 131 and a pair of friction members 132. The pressure plate 14 and the conical spring 15 are arranged between the first side plate 11 and the friction disk 13. The conical spring 15 presses the friction disk 13 against the second side plate 12 via the pressure plate 14.

[0047] [Vibration Damping Unit 20]

[0048] The vibration damping unit 20 includes an input side plate 21 (an example of a first rotating body), a hub flange 22 (an example of a second rotating body), and a vibration damping portion 23 arranged between the input side plate 21 and the hub flange 22.

[0049] <Input Side Plate 21>

[0050] The input side plate 21 has a first plate 211 and a second plate 212 (hereinafter, the first plate 211 and the second plate 212 may also be collectively referred to as "input side plate 21"). Both the first plate 211 and the second plate 212 are annular members having a central hole. As Figure 2 shown, the first plate 211 and the second plate 212 are fixed to each other by four stop pins 24 with a predetermined interval in the axial direction. Therefore, the first plate 211 and the second plate 212 cannot move relative to each other in the axial direction and the rotational direction. In addition, on the first plate 211, the inner peripheral portion of the core plate 131 of the friction disk 13 is fixed by the stop pin 24.

[0051] A pair of first window portions 21a and a pair of second window portions 21b are respectively formed on the first plate 211 and the second plate 212. The pair of first window portions 21a are arranged opposite to each other across the rotation axis O. In Figure 2In it, a first window portion 21a and a second window portion 21b of the second plate 212 are shown, and the first window portion and the second window portion of the first plate 211 have the same configuration.

[0052] A pair of first window portions 21a are formed by cutting and erecting the respective plates 211 and 212, have pressing surfaces 21c on both end surfaces in the circumferential direction, and have support portions on the outer periphery and the inner periphery respectively. In addition, a pair of second window portions 21b are spaced apart from the first window portions by 90° and are disposed opposite to each other across the rotation axis O. The pair of second window portions 21b are rectangular openings penetrating in the axial direction and have pressing surfaces 21d on both end surfaces in the circumferential direction.

[0053] <Hub flange 22>

[0054] The hub flange 22 is a component of a device for transmitting torque from the input side plate 21 to the output side. The hub flange 22 has a hub 221 and a flange 222. As Figure 2 shown, the hub 221 and the flange 222 are integrated by a plurality of teeth and a plurality of recesses that engage with the teeth.

[0055] The hub 221 is a cylindrical component disposed in the central holes of the first plate 211 and the second plate 212. A spline hole is formed in the inner peripheral portion of the hub 221, and a component on the output side can be spline-fitted with the spline hole.

[0056] As Figure 2 and Figure 3 shown, the flange 222 is formed in a disc shape and is disposed between the first plate 211 and the second plate 212 in the axial direction. The flange 222 has a central hole, a pair of first window holes 22a and a pair of second window holes 22b, and a pair of first limiting holes 26a and a pair of second limiting holes 26b.

[0057] The first window holes 22a are disposed opposite to each other across the rotation axis O and are formed at positions corresponding to the first window portions 21a of the first plate 211 and the second plate 212. The first window holes 22a have pressing surfaces 22d on both end surfaces in the circumferential direction. Each pressing surface 22d is formed only on the inner side and the outer side in the radial direction, and the middle portion in the radial direction communicates with the ends of the first limiting holes 26a and the second limiting holes 26b.

[0058] The second window hole 22b is spaced from the first window hole 22a by an interval of 90°, and is disposed opposite across the rotation axis O. That is, the second window hole 22b is formed at a position corresponding to the second window portion 21b of the first plate 211 and the second plate 212. The second window hole 22b is formed in an arc shape, and the pitch radius of the second window hole 22b (the radius at the central position of the radial width of the hole) is located more radially inward than the radial center position of the first window hole 22a. The second window hole 22b has pressing surfaces 22f at both end faces in the circumferential direction, and the distance between the two pressing surfaces 22f is set to be longer than the distance between the two pressing surfaces 21d of the second window portion 21b of the input side plate 21.

[0059] A pair of first limiting holes 26a are long holes extending in an arc shape on the R1 side (refer to Figure 2 and Figure 3 , hereinafter referred to as the "R1 side") in the circumferential direction of the first window hole 22a. The end on the R1 side of the first limiting hole 26a extends to the radially outer side of the second window hole 22b. In addition, the end on the R2 side (that is, the side of the first window hole 22a) of the first limiting hole 26a communicates with the radial middle portion of the first window hole 22a.

[0060] In addition, a pair of second limiting holes 26b are long holes extending in an arc shape on the R2 side (refer to Figure 2 and Figure 3 , hereinafter referred to as the "R2 side") in the circumferential direction of the first window hole 22a. The end on the R2 side of the second limiting hole 26b extends to the radially outer side of the second window hole 22b. In addition, the end on the R1 side (that is, the side of the first window hole 22a) of the second limiting hole 26b communicates with the radial middle portion of the first window hole 22a.

[0061] In such a structure, compared with the case where the respective limiting holes 26a and 26b are not communicated with the first window hole 22a, the ends on the first window hole 22a side of the respective limiting holes 26a and 26b can be extended longer to form. As a result, the operation range of the limiting mechanism 25 described later can be expanded. In addition, the angle formed by the rotation axis O and the pair of limiting pins 24 across the first window hole 22a can be made close to 90°, and the strength of the input side plate 21 and the flange 222 can be prevented from becoming uneven.

[0062] The limiting pins 24 respectively penetrate through the first limiting holes 26a and the second limiting holes 26b in the axial direction. Therefore, the input side plate 21 and the hub flange 22 can rotate relative to each other within the range where the limiting pins 24 can move within the respective limiting holes 26a and 26b. In other words, the limiting mechanism 25 is constituted by the limiting pins 24 and the respective limiting holes 26a and 26b, and the relative rotation between the input side plate 21 and the hub flange 22 is prohibited by the limiting pins 24 abutting against one end face of the respective limiting holes 26a and 26b.

[0063] <Vibration damping section 23>

[0064] The vibration damping section 23 is a mechanism for elastically connecting the input side plate 21 and the hub flange 22 in the rotational direction. As shown in Figure 1 and Figure 2 , it has two helical springs 27, two resin members 28, a pair of spring seats 30 for supporting the end faces of the helical springs 27, and a hysteresis generating mechanism 31 (see Figure 1 ).

[0065] The helical springs 27 are accommodated in the first window holes 22a of the flange 222, and the resin members 28 are accommodated in the second window holes 22b of the flange 222. Further, the helical springs 27 and the resin members 28 are supported axially and radially by the respective window portions 21a, 21b of the first plate 211 and the second plate 212.

[0066] It should be noted that the resin members 28 are arranged in the second window portions 21b of the input side plate 21 without clearance in the circumferential direction. On the other hand, the resin members 28 are shorter than the circumferential width of the second window holes 22b of the flange 222. That is, when the input side plate 21 and the hub flange 22 are not relatively rotated (the torsional angle is "0") and in the neutral state, a clearance is formed between the end portions of the resin members 28 and the pressing surfaces 22f of the second window holes 22b of the flange 222 (the details of the clearance will be described later).

[0067] The spring seats 30 are arranged at both circumferential ends of the first window holes 22a of the flange 222. The spring seats 30 support the end faces of the helical springs 27 and also support a part of the outer circumferential portions (both circumferential ends) of the helical springs 27. Therefore, the helical springs 27 are accommodated in the first window portions 21a of the first plate 211 and the second plate 212 and the first window holes 22a of the flange 222 without clearance in the circumferential direction through the spring seats 30.

[0068] The hysteresis generating mechanism 31 is arranged axially between the first plate 211 and the second plate 212 and the hub flange 22. As shown in Figure 1 , the hysteresis generating mechanism 31 has a first bushing 41, a second bushing 42, a third bushing 43, and a conical spring 44.

[0069] The first bushing 41 and the second bushing 42 are arranged axially between the inner circumferential end of the first plate 211 and the flange 222 on the outer circumferential surface of the hub 221. The second bushing 42 is engaged with the hub 221 in a non-rotatable manner and is in frictional contact with the first bushing 41. The third bushing 43 is arranged axially between the inner circumferential end of the second plate 212 and the flange 222. The third bushing 43 is engaged with the second plate 212 in a non-rotatable manner and is in frictional contact with the flange 222. The conical spring 44 is arranged in a compressed state between the third bushing 43 and the second plate 212.

[0070] With the above configuration, when the first plate 211 and the second plate 212 rotate relative to the hub flange 22, a hysteresis torque is generated.

[0071] [Operation]

[0072] The torque transmitted from the engine to the flywheel is input to the vibration damping unit 20 via the torque limiting unit 10. In the vibration damping unit 20, the torque is input to the input side plate 21 of the friction disk 13 to which the torque limiting unit 10 is fixed, and this torque is transmitted to the hub flange 22 via the spiral spring 27 and the resin member 28. Then, the power is transmitted from the hub flange 22 to the output side motor, generator, transmission, etc.

[0073] In addition, for example, when starting the engine, due to the large inertia on the output side, sometimes an excessive torque is transmitted from the output side to the engine. In such a case, the torque transmitted to the engine side is limited to a predetermined value or less by the torque limiting unit 10.

[0074] <Positive side torsional characteristics>

[0075] The torsional characteristics on the positive side in the vibration damping unit 20, that is, the characteristics when torque is input from the engine (input of positive side torque), will be described.

[0076] When positive side torque is input, in Figure 2 , the input side plate 21 rotates in the R1 direction. Therefore, the two spiral springs 27 are compressed between the spring seats 30 supported by the pressing surface 21c on the R2 side of the first window portion 21a of the input side plate 21 and the spring seats 30 supported by the pressing surface 22d on the R1 side of the first window hole 22a of the flange 222.

[0077] It should be noted that the resin member 28 is supported without clearance by the second window portion 21b of the input side plate 21 at neutral, but in the second window hole 22b of the flange 222, there are circumferential clearances of θ1 on the R1 side and the R2 side respectively. In addition, there is a circumferential clearance of θ2 on the R1 side or the R2 side between the limit pin 24 and each limiting hole 26a, 26b. Here, the relationship of each circumferential clearance (hereinafter simply referred to as "clearance") is set as follows.

[0078] θ1 < θ2

[0079] By setting the clearances as above, before the torsional angle between the input side plate 21 and the hub flange 22 (hereinafter, when referred to as "torsional angle", it is the torsional angle between the input side plate and the hub flange) reaches θ1, the resin member 28 is not compressed. Then, if the torsional angle exceeds θ1, the resin member 28 is also compressed. Therefore, as Figure 4As shown, before the torsional angle reaches θ1, the torsional characteristic on the positive side is characteristic C1. If the torsional angle exceeds θ1, the torsional characteristic on the positive side becomes characteristic C2.

[0080] In addition, when the torsional angle reaches θ2, the limiting pin 24 abuts against the end face on the R1 side of the first limiting hole 26a, and the relative rotation between the input side plate 21 and the hub flange 22 is prohibited.

[0081] <Negative side torsional characteristic>

[0082] The torsional characteristic on the negative side in the damping unit 20, that is, the characteristic when torque is input in the reverse direction from the drive unit side (input of negative side torque), will be described.

[0083] When negative side torque is input, in Figure 2 the hub flange 22 rotates relative to the input side plate 21 in the R1 direction. Therefore, the two helical springs 27 are compressed between the spring seats 30 on the R2 side pressing surface 22d of the first window hole 22a of the hub flange 22 and the spring seats 30 on the R1 side pressing surface 21c of the first window portion 21a of the input side plate 21.

[0084] Regarding the operation of the resin member 28, it is the same as the case when positive side torque is input. That is, it is not compressed before the torsional angle reaches -θ1, and when the torsional angle is below -θ1, as Figure 4 shown, it becomes a low-rigidity torsional characteristic C1. In addition, when the torsional angle reaches -θ1, the resin member 28 starts to be compressed between the R2 side pressing surface 22f of the second window hole 22b of the hub flange 22 and the R1 side pressing surface 21d of the second window portion 21b of the input side plate 21. Therefore, if the torsional angle exceeds -θ1, as Figure 4 shown, it becomes a high-rigidity torsional characteristic C2.

[0085] When the torsional angle reaches -θ2, the limiting pin 24 abuts against the end face on the R2 side of the limiting hole 26b, and the relative rotation between the input side plate 21 and the hub flange 22 is prohibited.

[0086] In such an embodiment, the ends of the first limiting hole 26a and the second limiting hole 26b on the side of the first window hole 22a communicate with the first window hole 22a. In addition, the ends of the first limiting hole 26a and the second limiting hole 26b on the side far from the first window hole 22a are formed to extend to the radial outside of the second window hole 22b. Therefore, the circumferential length of each limiting hole 26a, 26b can be increased, and the torsional angle between the input side plate 21 and the hub flange 22 can be increased (that is, wide-angle).

[0087] In addition, for the same reason, the restriction holes 26a and 26b on both sides of the first window hole 22a of the flange 222 can be made to approach each other. As a result, the angle formed by the rotation axis O and the restriction pins 24 on both sides of the first window hole 22a can be made close to 90 degrees, and the non-uniformity of the strength of the input side plate 21 and the hub flange 22 can be suppressed.

[0088] -Second Embodiment-

[0089] Figure 5 and Figure 6 The vibration damping unit 20' and the flange 40 according to the second embodiment of the present invention are shown. In the second embodiment, the structure except for the flange 40 is the same as that of the first embodiment. In addition, in the flange 40, except for the structure of the first window hole and the restriction holes, it is the same as the flange 222 of the first embodiment.

[0090] The flange 40 has: a center hole, a pair of first window holes 41a and a pair of second window holes 41b, and a pair of first restriction holes 42a and a pair of second restriction holes 42b. The arrangement of the window holes 41a and 41b is the same as that of the first embodiment.

[0091] The pair of first restriction holes 42a are long holes extending in an arc shape on the R1 side in the circumferential direction of the first window hole 41a. The first restriction holes 42a are formed separately from the first window hole 41a. That is, different from the first embodiment, the end on the R2 side of the first restriction hole 42a does not communicate with the first window hole 41a. In addition, the end on the R1 side of the first restriction hole 42a extends to the radially outer side of the second window hole 41b.

[0092] In addition, the pair of second restriction holes 42b are long holes extending in an arc shape on the R2 side in the circumferential direction of the first window hole 41a. The end on the R2 side of the second restriction hole 42b extends to the radially outer side of the second window hole 41b, and the end on the R1 side of the second restriction hole 42b communicates with the radial middle part of the first window hole 41a.

[0093] The torsional characteristics of the second embodiment are the same as those of the first embodiment. In such a second embodiment, the same effects as those of the first embodiment can also be obtained.

[0094] Here, in the second embodiment, the radial positions of the pair of first window holes 41a are the same, but the pitch radius P1 (the radius of the radial center part of the first restriction hole 42a) of the first restriction hole 42a is larger than the pitch radius P2 of the second restriction hole 42b. That is, the first restriction hole 42a and the second restriction hole 42b are formed at radially offset positions.

[0095] In such a structure, the first restricting hole 42a that does not communicate with the first window hole 41a can be formed on the more outer peripheral side, and the operating angle of the restricting mechanism can be enlarged. On the other hand, the second restricting hole 42b can communicate with the substantially central portion in the radial direction of the first window hole 41a.

[0096] -Third Embodiment-

[0097] Figures 7 to 10 The third embodiment of the present invention is shown. In the third embodiment, the structure except for the flange 50 and one spring seat 55 is the same as that of the second embodiment. In addition, in the flange 50, the structure except for the structure of the first window hole and the restricting hole is the same as that of the flange 40 of the second embodiment.

[0098] The flange 50 has: a central hole, a pair of first window holes 51a and a pair of second window holes 51b, and a pair of first restricting holes 52a and a pair of second restricting holes 52b. The arrangement of each window hole 51a, 51b is the same as that of the first embodiment.

[0099] The first window hole 51a has a protrusion 51e on the pressing surface 51d on the R1 side. The protrusion 51e protrudes in a manner of bulging toward the R2 side at the central portion in the radial direction of the pressing surface 51d. The second window hole 51b is the same as that of the first embodiment and the second embodiment.

[0100] The pair of first restricting holes 52a are long holes that extend in an arc shape on the R1 side in the circumferential direction of the first window hole 51a. The first restricting hole 52a is formed separately from the first window hole 51a. That is, different from the first embodiment, the end portion on the R2 side of the first restricting hole 52a does not communicate with the first window hole 51a. In addition, the end portion on the R1 side of the first restricting hole 52a extends to the outside in the radial direction of the second window hole 51b.

[0101] Then, the end portion on the R2 side of the first restricting hole 52a extends toward the protrusion 51e of the first window hole 51a. Specifically, the end portion on the R2 side of the first restricting hole 52a reaches the straight line L. Here, the straight line L is a straight line connecting the pressing surface on the outer peripheral side and the pressing surface on the inner peripheral side of the first window hole 51a where the protrusion 51e is not formed.

[0102] In such a structure, compared with the case where the protrusion 51e is not formed in the first window hole 51a, the end portion on the R2 side of the first restricting hole 52a can be formed to be longer. In addition, since the second restricting hole 52b communicates with the first window hole 51a, the angle formed by the rotation axis O and the pair of restricting pins 24 with the first window hole 51a interposed therebetween can be made close to 90°.

[0103] In addition, since one end portion of the first window hole 51a is not communicated with the first restraining hole 52a, a reduction in the strength of the flange 50 can be suppressed.

[0104] In addition, in this third embodiment, similarly to the second embodiment, the pitch radius P1 (the radius of the radially central portion of the first restraining hole 52a) of the first restraining hole 52a is larger than the pitch radius P2 of the second restraining hole 52b. That is, the first restraining hole 52a and the second restraining hole 52b are formed at positions offset in the radial direction.

[0105] Therefore, the end portion on the R2 side of the first restraining hole 52a can be extended toward the radially central portion (i.e., the protruding portion 51e) of the first window hole 51a. In addition, the end portion on the R1 side of the second restraining hole 52b can be communicated with the radially central portion of the first window hole 51a.

[0106] Figure 9 and Figure 10 Fig. shows the spring seat 55 used in the third embodiment. The spring seat 55 is disposed at the end portion on the R1 side of the first window hole 51a of the flange 50. The spring seat 55 supports the end face of the coil spring 27 and also supports a part (one end portion in the circumferential direction) of the outer peripheral portion of the coil spring 27.

[0107] As Figure 9 and Figure 10 shown, the spring seat 55 has an end face support portion 551 and an outer peripheral support portion 552. It should be noted that Figure 9 is a side view of the spring seat 55 (a view observed from one side in the circumferential direction), Figure 10 is Figure 9 a cross-sectional view taken along the line X-X of

[0108] The end face support portion 551 supports the end face of the coil spring 27, and the end face support portion 551 is supported by the pressing surface 21c of the first window portion 21a of the input side plate 21 and the pressing surface 51d of the first window hole 51a of the flange 50. As Figure 10 shown, a concave portion 551a that is recessed in an arc shape is formed on the surface of the end face support portion 551 that is supported by the pressing surface 51d of the first window hole 51a. In addition, a hole 551b that penetrates in the circumferential direction is provided at the central portion of the concave portion 551a, that is, at the radially central portion and the axially central portion. Then, the protruding portion 51e of the first window hole 51a of the flange 50 is fitted into the concave portion 551a.

[0109] The outer peripheral support portion 552 is formed to extend in the circumferential direction from the outer peripheral end portion of the end face support portion 301. The outer peripheral support portion 552 is disposed between the outer peripheral portion of one end portion of the coil spring 27 and the inner peripheral surfaces of the first window portion 21a and the first window hole 51a. Therefore, even if the coil spring 27 moves outward due to centrifugal force or in a compressed state, contact between the coil spring 27 and the first window portion 21a and the first window hole 51a can be avoided.

[0110] It should be noted that the spring seat 30 disposed on the pressing surface on the R2 side of the first window hole 51a is a well-known spring seat as in the first and second embodiments, so its description is omitted.

[0111] [Other Embodiments]

[0112] The present invention is not limited to the above-described embodiments, and various deformations or modifications can be made without departing from the scope of the present invention.

[0113] (a) In each of the above-described embodiments, the spring seat is disposed in the first window hole of the hub flange, but this spring seat is not essential. That is, the end face of the coil spring may be in direct contact with the pressing surfaces of the input side plate and the flange.

[0114] (b) In the second and third embodiments described above, the pitch radii of the first limiting hole and the second limiting hole are changed, but the pitch radii of these holes may also be the same.

[0115] (c) In each of the above-described embodiments, resin members are installed in the second window portion and the second window hole, but a coil spring may also be installed.

Claims

1. A vibration damping device, comprising: A first rotating body having a plurality of first window portions and a plurality of second window portions, wherein the plurality of first window portions are arranged at positions radially outside the plurality of second window portions; A second rotating body configured to be rotatable relative to the first rotating body and having a plurality of first window holes and a plurality of second window holes, wherein the plurality of first window holes are arranged at positions radially outside the plurality of second window holes; A plurality of elastic members accommodated in the first window portions and the first window holes and the second window portions and the second window holes, and elastically connecting the first rotating body and the second rotating body in the rotational direction; And A limiting mechanism for limiting the relative rotational angle between the first rotating body and the second rotating body within a specified angular range, The limiting mechanism having: A first limiting hole formed to extend in the circumferential direction on one side in the circumferential direction of the first window hole of the second rotating body, an end portion of the first limiting hole closer to the first window hole communicating with the first window hole, and an end portion of the first limiting hole farther from the first window hole extending radially outside the second window hole; A second limiting hole formed to extend in the circumferential direction on the other side in the circumferential direction of the first window hole of the second rotating body; And A plurality of limiting members fixed to the first rotating body, axially penetrating the first limiting hole and the second limiting hole, and capable of moving in the circumferential direction within the first limiting hole and the second limiting hole.

2. The vibration damping device according to claim 1, wherein An end portion of the second limiting hole closer to the first window hole communicates with the first window hole, and an end portion of the second limiting hole farther from the first window hole extends radially outside the second window hole.

3. The vibration damping device according to claim 2, wherein The first limiting hole and the second limiting hole are formed in an arc shape having the same pitch radius.

4. A vibration damping device, comprising: A first rotating body having a plurality of first window portions; A second rotating body configured to be rotatable relative to the first rotating body and having a plurality of first window holes; A plurality of first elastic members, the first elastic members being accommodated in the first window portions and the first window holes and elastically connecting the first rotating body and the second rotating body in the rotational direction; And A limiting mechanism for limiting the relative rotational angle between the first rotating body and the second rotating body within a specified angular range, The limiting mechanism having: A first limiting hole separated from the first window hole on one side in the circumferential direction of the first window hole and formed in an arc shape having a first pitch radius; A second limiting hole formed in an arc shape having a second pitch radius smaller than the first pitch radius on the other side in the circumferential direction of the first window hole, an end portion of the second limiting hole closer to the first window hole communicating with the first window hole; And A plurality of limiting members fixed to the first rotating body, axially penetrating the first limiting hole and the second limiting hole, and capable of moving in the circumferential direction within the first limiting hole and the second limiting hole.

5. The vibration damping device according to claim 4, wherein, the first rotating body has a plurality of second window portions formed at positions radially inward of the plurality of first window portions, the second rotating body has a plurality of second window holes formed at positions radially inward of the plurality of first window holes, the vibration damping device further includes a plurality of second elastic members accommodated in the plurality of second window portions and the plurality of second window holes and elastically connecting the first rotating body and the second rotating body in the rotational direction, end portions of the first limiting use hole and the second limiting use hole on a side away from the first window hole extend radially outside the second window hole.

6. The vibration damping device according to claim 4 or 5, wherein, the first window hole has a pair of pressing surfaces at both circumferential ends, and a pressing surface of the pair of pressing surfaces closer to the first limiting use hole has a protruding portion protruding in a manner of bulging toward the opposite pressing surface, an end portion of the first limiting use hole closer to the first window hole extends toward the protruding portion.

Images