Damper Device

Abstract

To provide a damper device capable of attaining suitable torsion characteristics in a positive side and a negative side in accordance with a specification of a vehicle.SOLUTION: This device includes an input side plate 30, a hub flange 40, and an elastic connection part 50. The elastic connection part 50 has a first torsion characteristic T1, a second torsion characteristic T2, and a third torsion characteristic T3. The first torsion characteristic T1 has first rigidity in a first operational area in which a torsional angle range in a positive side is wider than in a negative side. The second torsion characteristic T2 has second rigidity higher than the first rigidity in a second operational area exceeding the positive side in the first operational area. The third torsion characteristic T3 has third rigidity higher than the first rigidity and lower than the second rigidity in a third operational area exceeding the negative side in the first operational area.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

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

[0003] The damper device of Patent Document 1 has a damper section that includes a pair of plates and multiple torsion springs, and a torque limiter is provided on the outer periphery of the damper section. The torque limiter and the damper section are connected by rivets. The plates of the torque limiter are then fixed to the flywheel by bolts.

[0004] Here, the torque limiter limits the torque transmitted between the damper portion and the flywheel, preventing excessive torque from being transmitted between them. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-226572 Summary of the Invention [Problem to be solved by the invention]

[0006] A damper device in a hybrid vehicle operates mainly in a positive torsion angle range (hereinafter sometimes simply referred to as the "positive side") in terms of torsional characteristics when the engine is running, such as during driving, and operates mainly in a negative torsion angle range (hereinafter sometimes simply referred to as the "negative side") when the engine is started. Therefore, the required torsional characteristics may differ between the positive side and the negative side.

[0007] For example, on the positive side, in the region where the torsion angle is small, low rigidity and wide-angle torsional characteristics are required. Also, in the region where the torsion angle is large, for example, in case a large torque is input from the tire side, high rigidity torsional characteristics are required. On the other hand, on the negative side, in order to efficiently absorb vibrations during engine startup, it is necessary to reduce the difference in rigidity between the first stage torsional characteristics and the subsequent second stage torsional characteristics. Therefore, in the region where the torsion angle is large on the negative side, torsional characteristics with lower rigidity are required than in the region where the torsion angle is large on the positive side.

[0008] An object of the present invention is to obtain appropriate torsional characteristics on the positive and negative sides in a damper device according to the specifications of a vehicle. [Means for solving the problem]

[0009] (1) A damper device according to the present invention includes a first rotating body, a second rotating body, and an elastic connecting portion. The second rotating body is rotatable relative to the first rotating body. The elastic connecting portion elastically connects the first rotating body and the second rotating body in the rotational direction. The elastic connecting portion has a first torsional characteristic, a second torsional characteristic, and a third torsional characteristic. The first torsional characteristic has a first stiffness in a first operational range of torsional angles spanning both the positive and negative sides, and the first operational range has a different torsional angle range between the positive and negative sides. The second torsional characteristic has a second stiffness higher than the first stiffness in a second operational range of torsional angles, and the second operational range is an operational range beyond the positive side of the first operational range. The third torsional characteristic has a third stiffness that is higher than the first stiffness and different from the second stiffness in a third operating range of the torsion angle, the third operating range being an operating range beyond the negative side of the first operating range.

[0010] In this device, the positive and negative sides of the first operational region having the first torsional characteristic are different. For example, widening the positive operational region can improve vibration absorption performance during engine operation, depending on the specifications. On the positive and negative sides beyond the first operational region, the device has second and third torsional characteristics with higher rigidity than the first torsional characteristic. The rigidity of the second torsional characteristic is different from the rigidity of the third torsional characteristic. Therefore, for example, by increasing the rigidity of the second torsional characteristic on the positive side, torque from the tire can be effectively absorbed. Furthermore, by increasing the rigidity of the third torsional characteristic on the negative side so that it is close to the rigidity of the first torsional characteristic, vibration absorption performance during engine start-up in hybrid vehicles can be improved.

[0011] (2) Preferably, the first operating range is wider on the positive side than on the negative side, which improves vibration absorption performance when the vehicle is running on the engine.

[0012] (3) Preferably, the second rigidity of the second torsional characteristic of the elastic connecting portion is higher than the third rigidity of the third torsional characteristic. This allows torque from the tire to be sufficiently absorbed. Furthermore, when this damper device is installed in a hybrid vehicle, it can effectively absorb vibrations during engine start-up.

[0013] (4) Preferably, the elastic connecting portion has a first elastic portion and a second elastic portion arranged side by side in the circumferential direction and operating in parallel. The first elastic portion has a fourth torsional characteristic and a fifth torsional characteristic. The second elastic portion has a sixth torsional characteristic and a seventh torsional characteristic.

[0014] The fourth torsional characteristic has a fourth stiffness in a fourth operating range of the torsional angle, spanning both the positive and negative sides. The fourth operating range is different between the positive and negative sides. The fifth torsional characteristic has a fifth stiffness higher than the fourth stiffness in a fifth operating range of the torsional angle. The fifth operating range is an operating range beyond the positive side of the fourth operating range and an operating range beyond the negative side of the fourth operating range. The sixth torsional characteristic has a sixth stiffness in a sixth operating range of the torsional angle, spanning both the positive and negative sides, and is offset from the fourth torsional characteristic in the torsional angle direction and the input torque direction. The seventh torsional characteristic has a seventh stiffness higher than the sixth stiffness and different from the fifth stiffness in a seventh operating range of the torsional angle, and the seventh operating range is an operating range beyond the positive side of the sixth operating range and an operating range beyond the negative side of the sixth operating range.

[0015] (5) Preferably, the first rotating body has a first support portion and a second support portion. The second rotating body has a first accommodating portion and a second accommodating portion. The first accommodating portion is provided offset in the first rotation direction relative to the first support portion. The second accommodating portion is provided offset in the second rotation direction relative to the second support portion. The elastic connecting portion has a first elastic member and a second elastic member. The first elastic member is pre-compressed and arranged in the first support portion and the first accommodating portion, and elastically connects the first rotating body and the second rotating body in the rotation direction. The second elastic member is pre-compressed and arranged in the second support portion and the second accommodating portion, and elastically connects the first rotating body and the second rotating body in the rotation direction.

[0016] (6) Preferably, the offset angle between the first support portion and the first housing portion is the same as the offset angle between the second support portion and the second housing portion. Also, the first elastic member and the second elastic member have the same rigidity.

[0017] (7) Preferably, the first elastic member has a first coil spring and a first elastic body. The first elastic body is disposed inside the first coil spring and is shorter in length than the first coil spring. The second elastic member has a second coil spring and a second elastic body. The second elastic body is disposed inside the second coil spring and is shorter in length than the second coil spring and different in length from the first elastic body.

[0018] (8) Preferably, the first elastic body and the second elastic body are made of resin. [Effects of the Invention]

[0019] According to the present invention as described above, it is possible to obtain appropriate torsional characteristics in both the positive and negative operating ranges of the damper device in accordance with the vehicle specifications. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a cross-sectional view of a damper device according to an embodiment of the present invention; [Figure 2] FIG. 2 is a front view of the damper device of FIG. 1. [Figure 3] FIG. 4 is a diagram showing the positional relationship between the input side plate and the hub flange. [Figure 4A] FIG. [Figure 4B] FIG. 10 is a diagram illustrating a state in which compression of the first resin member begins. [Figure 4C] FIG. 10 is a diagram illustrating a state in which compression of the second resin member begins. [Figure 5] FIG. 4 is a diagram showing the torsional characteristics of the damper unit. [Figure 6] FIG. 4 is a schematic diagram illustrating the operation of the first window portion. [Figure 7] 5A and 5B are schematic diagrams for explaining the operation of the second window portion. [Figure 8] FIG. 10 is a diagram showing the torsional characteristics of a damper unit according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0021] [Overall configuration] Fig. 1 is a cross-sectional view of a damper device 1 with a torque limiter (hereinafter simply referred to as "damper device") according to one embodiment of the present invention. Fig. 2 is a front view of the damper device 1, with some of its constituent members removed. In Fig. 1, an engine (not shown) is disposed on the left side of the damper device 1, and a drive unit (not shown) including an electric motor, a transmission, etc. is disposed on the right side.

[0022] In the following description, the axial direction refers to the direction in which the rotation axis O of the damper device 1 extends. The circumferential direction refers to the circumferential direction of a circle centered on the rotation axis O, and the radial direction refers to the radial direction of the circle centered on the rotation axis O. The circumferential direction does not have to perfectly coincide with the circumferential direction of the circle centered on the rotation axis O. The radial direction does not have to perfectly coincide with the diameter direction of the circle centered on the rotation axis O.

[0023] The damper device 1 is provided between a flywheel (not shown) and the input shaft of a drive unit, and serves to limit the torque transmitted between the engine and the drive unit and to damp rotational fluctuations. The damper device 1 includes a torque limiter unit 10 and a damper unit 20.

[0024] [Torque limiter unit 10] The torque limiter unit 10 is disposed on the outer periphery of the damper unit 20. The torque limiter unit 10 limits the torque transmitted between the flywheel and the damper unit 20. The torque limiter unit 10 includes a cover plate 11, a support plate 12, a friction disc 13, a pressure plate 14, and a cone spring 15.

[0025] [Damper unit 20] The damper unit 20 has an input side plate 30 (an example of a first rotating body), a hub flange 40 (an example of a second rotating body), an elastic connecting portion 50, and a hysteresis generating mechanism 60.

[0026] <Input side plate 30> The input side plate 30 includes a first plate 31 and a second plate 32. The first plate 31 and the second plate 32 are formed in a circular disk shape with a hole in the center and are spaced apart from each other in the axial direction. The first plate 31 includes four stopper portions 31a and four fixing portions 31b on the outer periphery. The first plate 31 and the second plate 32 include a pair of first support portions 301 and a pair of second support portions 302, respectively. The first support portions 301 and the second support portions 302 are formed in the same positions on the first plate 31 and the second plate 32. The first plate 31 includes a hole 31c for a rivet 17, and the second plate 32 includes an assembly hole 32a at a position corresponding to the hole 31c. The inner periphery of the friction disc 13 of the torque limiter unit 10 is fixed to the first plate 31 by the rivet 17 passing through the assembly hole 32a.

[0027] The stopper portion 31a is formed by bending the outer periphery of the first plate 31 toward the second plate 32 and extends in the axial direction. The fixing portion 31b is formed by bending the tip of the stopper portion 31a radially outward. This fixing portion 31b is fixed to the outer periphery of the second plate 32 with a plurality of rivets 33. Therefore, the first plate 31 and the second plate 32 cannot rotate relative to each other and cannot move axially relative to each other.

[0028] As shown in FIG. 2 and FIG. 3 illustrating the first plate 31, the pair of first support portions 301 are disposed opposite each other across the rotation axis O. The pair of second support portions 302 are disposed opposite each other across the rotation axis O, with a 90° gap between them. Each support portion 301, 302 has the same shape and has a hole penetrating in the axial direction and raised edges on the inner and outer circumferential edges of the hole.

[0029] <Hub flange 40> As shown in FIGS. 1 and 2, the hub flange 40 has a hub 41 and a flange 42. The hub flange 40 is rotatable relative to the input plate 30 within a predetermined angular range. The hub 41 is formed in a cylindrical shape and has a spline hole 41a formed in its center. The hub 41 also passes through central holes in the first plate 31 and the second plate 32. The flange 42 is formed in a disk shape and extends radially outward from the outer circumferential surface of the hub 41. The flange 42 is disposed axially between the first plate 31 and the second plate 32.

[0030] The flange 42 has four stopper projections 42 b, a pair of first and second receiving portions 401 and 402 , and four notches 403 .

[0031] The four stopper projections 42b are formed to protrude radially outward from the outer peripheral surface of the flange 42. Each stopper projection 42b is formed radially outward from the circumferential center of each accommodation portion 401, 402. When the input side plate 30 and the hub flange 40 rotate relative to each other, the stopper projections 42b come into contact with the stopper portion 31a of the first plate 31, thereby prohibiting relative rotation between the input side plate 30 and the hub flange 40.

[0032] As shown in Figure 2 and Figure 3, which shows the hub flange 40, the pair of first accommodating portions 401 are arranged opposite each other with the rotation axis O in between. The pair of second accommodating portions 402 are arranged circumferentially between the first accommodating portions 401, opposite each other with the rotation axis O in between. The accommodating portions 401, 402 have the same shape and are approximately rectangular holes with arc-shaped outer peripheries.

[0033] The four notches 403 are formed at a predetermined depth radially inward from the outer circumferential surface of the flange 42 between adjacent accommodating portions 401, 402 in the circumferential direction. The position at which each notch 403 is formed corresponds to the position of the rivet 17 that connects the friction disc 13 of the torque limiter unit 10 to the first plate 31. Therefore, the torque limiter unit 10 and the damper unit 20, which are assembled in separate processes, can be fixed together with the rivet 17 using the assembly holes 32a of the second plate 32 and the notches 403 of the flange 42.

[0034] <Arrangement of support and storage parts> FIG. 3 shows the positional relationship of the hub flange 40 with respect to the input plate 30 (here, the first plate 31) in a neutral state. In FIG. 3, a line C1 is a line that passes through the centers of the pair of first support portions 301 and the rotation axis O. Furthermore, a line C2 is a line that passes through the centers of the pair of second support portions 302 and the rotation axis O. In an assembled state, the input plate 30 and the hub flange 40 are assembled so that they overlap each other while maintaining the positional relationship shown in FIG. 3. Here, the "neutral state" refers to a state in which the relative rotation angle between the input plate 30 and the hub flange 40 is 0° (a torsional angle of 0°, in which they are not twisted).

[0035] The pair of first housing portions 401 are disposed at positions corresponding to the pair of first support portions 301. The pair of second housing portions 402 are disposed at positions corresponding to the pair of second support portions 302. More specifically, the pair of first housing portions 401 are disposed so as to partially overlap with the first support portions 301 when viewed in the axial direction and are offset by an angle θ0 toward the first rotation direction side (hereinafter simply referred to as the "R1 side"). That is, the first housing portions 401 are disposed so as to be offset by an angle θ0 toward the R1 side with respect to the line C1. The second housing portion 402 is disposed so as to partially overlap with the second support portions 302 when viewed in the axial direction and are offset by an angle θ0 toward the second rotation direction side (hereinafter simply referred to as the "R2 side"). That is, the second housing portion 402 is disposed so as to be offset by an angle θ0 toward the R2 side with respect to the line C2.

[0036] <Spring seat 34> A pair of spring seats 34 are attached to the first support portion 301 and the first accommodating portion 401 (hereinafter, these may be collectively referred to as the "first window portion w1") and the second support portion 302 and the second accommodating portion 402 (hereinafter, these may be collectively referred to as the "second window portion w2") so as to face each other (see Figure 2).

[0037] Here, when a spring seat 34 is disposed in each window portion w1, w2 and the entire first support portion 301 of the input side plate 30 and the entire first accommodating portion 401 of the hub flange 40 overlap when viewed in the axial direction (i.e., the offset angle is "0"), the distance between the opposing spring seats 34 (more precisely, the abutment surfaces of the opposing spring seats 34 that abut against the end faces of the coil springs) is set to L. Similarly, when the entire second support portion 302 and the entire second accommodating portion 402 overlap when viewed in the axial direction, the distance between the opposing spring seats 34 is set to L.

[0038] <Elastic connecting portion 50> The elastic connecting portion 50 has a first elastic portion 501 and a second elastic portion 502 arranged side by side in the circumferential direction. The first elastic portion 501 and the second elastic portion 502 operate in parallel. The first elastic portion 501 has two coil springs 51 and two first resin members 521 (an example of a first elastic body). The second elastic portion 502 has two coil springs 51 and two second resin members 522 (an example of a second elastic body).

[0039] Each coil spring 51 has the same stiffness k0 and includes an outer spring and an inner spring disposed inside the outer spring. The four coil springs 51 are housed in the housing portions 401, 402 of the flange 42 and are supported in the radial and axial directions by the support portions 301, 302 of the input side plate 30. These coil springs 51 operate in parallel. All four coil springs 51 have the same free length Sf. The free length Sf of each coil spring 51 is the same as the distance L between the opposing spring seats 34 attached to the windows w1, w2 (more precisely, between the abutment surfaces where the end faces of the coil springs 51 of the spring seats 34 abut) when the offset angle is "0."

[0040] As shown in FIG. 4A, the first resin member 521 is disposed inside the coil spring 51 at the first window w1. The second resin member 522 is disposed inside the coil spring 51 at the second window w2. The first resin member 521 is cylindrical, with a length d1 and a rigidity k1. The second resin member 522 is generally cylindrical, with large diameter portions at both ends and a small diameter portion in the center, with a length d2 and a rigidity k2. The relationship between the length and rigidity of the coil spring 51 and both resin members 521 and 522 is as follows: d1 <d2<Sf k1>k2>k0 is set to.

[0041] <Stored state of the coil spring 51> Here, the accommodation state of the coil springs 51 in the windows w1 and w2 in the neutral state will be described in detail below.

[0042] As described above, in the neutral state, the pair of first housing portions 401 are offset by angle θ0 toward the R1 side relative to the corresponding first support portion 301. Meanwhile, the pair of second housing portions 402 are offset by angle θ0 toward the R2 side relative to the second support portion 302. Coil springs 51 are mounted in a compressed state in openings (holes passing through in the axial direction) at the axially overlapping portions of each support portion 301, 302 and the corresponding housing portions 401, 402.

[0043] [Torsion characteristics] Figure 5 is a torsional characteristic diagram (hysteresis torque is omitted), with the horizontal axis representing the torsional angle and the vertical axis representing the torque. In Figure 5, the dashed line represents the torsional characteristic of the first window portion w1, the dashed line represents the torsional characteristic of the second window portion w2, and the solid line represents the torsional characteristic of the damper unit 20, which is a combination of the torsional characteristics of the first window portion w1 and the second window portion w2.

[0044] As is clear from the torsional characteristics indicated by the solid line in FIG. 5 , the damper unit 20 of this embodiment has a first torsional characteristic T1 with low stiffness, a second torsional characteristic T2 with high stiffness on the positive side, and a third torsional characteristic T3 with high stiffness on the negative side. The first torsional characteristic T1 has a first stiffness KL in a first operational range of torsional angles spanning both the positive and negative sides. The positive side region Ap of the first operational range is wider than the negative side region An. The second torsional characteristic T2 has a second stiffness KHp that is higher than the first stiffness KL in a second operational range beyond the positive side of the first operational range. The third torsional characteristic T3 has a third stiffness KHn that is higher than the first stiffness KL but lower than the second stiffness KHp in a third operational range beyond the negative side of the first operational range. The relationship between operational ranges and stiffness is shown below.

[0045] Ap>An KL <KHn<KHp

[0046] [Operation] The operation of each window portion w1, w2 will be described in detail, but hysteresis torque will be omitted. Figure 6 is a schematic diagram for explaining the operation of the first window portion w1, and Figure 7 is a schematic diagram for explaining the operation of the second window portion w2.

[0047] <First window portion w1> 4A and 6(a) show a neutral state in which the input plate 30 and the hub flange 40 are not rotating relative to each other. 4B and 6(b) show a state in which the hub flange 40 twists from this neutral state toward R1 relative to the input plate 30, causing compression of the first resin member 521. Conversely, FIG. 6(c) shows a state in which the hub flange 40 twists from the neutral state toward R2 relative to the input plate 30, causing compression of the first resin member 521. In the following description, the torsional angle of the hub flange 40 relative to the input plate 30 may be simply referred to as the "torsion angle."

[0048] First, in the neutral state, the first support portion 301 and the first accommodation portion 401 are arranged offset from each other in the first window portion w1. First window w1 5, the distance between the opposing spring seats 34 is shorter than the free length Sf of the coil spring 51. Therefore, in this neutral state, a torsional torque +t is generated by the compressed coil spring 51, as shown by the dashed line in FIG.

[0049] The coil springs 51 are constantly compressed when the torsion angle on the R1 side is between 0° and the torsion angle θ1 at which compression of the first resin member 521 begins. Therefore, when the torsion angle is in the range of 0 to θ1, a torsion characteristic T4 (an example of a fourth torsion characteristic) with a relatively low rigidity is obtained due to the rigidity k4 (an example of a fourth rigidity) of the two coil springs 51.

[0050] Next, when both end faces of the first resin member 521 abut against the abutment surfaces of the opposing spring seats 34 (see Figure 6(b)), from this torsional angle θ1 onwards, a high rigidity torsional characteristic T5 (an example of the fifth torsional characteristic) is obtained due to the rigidity k1 (an example of the fifth rigidity) of the first resin member 521.

[0051] On the other hand, when the hub flange 40 is twisted by an offset angle θ0 from the neutral state toward the R2 side relative to the input plate 30, the distance between the pair of spring seats 34 supporting the coil spring 51 becomes L, which is the same as the free length Sf of the coil spring 51. Therefore, as shown by the dashed line in Figure 5, when the torsional angle between the input plate 30 and the hub flange 40 is -θ0, the torsional torque becomes "0."

[0052] Furthermore, when the hub flange 40 twists toward the R2 side beyond the offset angle θ0, the distance between the pair of spring seats 34 supporting the coil spring 51 again becomes narrower than the free length Sf of the coil spring 51. Therefore, when the torsion angle exceeds −θ0 on the negative side, the coil spring 51 is compressed from the free length Sf, and torsional characteristics similar to those on the positive side are obtained with two coil springs 51.

[0053] Then, as shown in FIG. 6(c), when the torsion angle becomes −θ2, both end surfaces of the first resin member 521 come into contact with the contact surfaces of the opposing spring seats 34, and thereafter, similarly to the above, the high rigidity due to the rigidity k1 (an example of the fifth rigidity) of the first resin member 521 is maintained. Torsional characteristics T5 (An example of the fifth torsional characteristic) is obtained.

[0054] <Second window portion w2> 4A and 7(a) show a neutral state in which the input plate 30 and the hub flange 40 are not rotating relative to each other. FIG. 7(b) shows a state in which the hub flange 40 twists from this neutral state toward the R1 side relative to the input plate 30, causing compression of the second resin member 522. Conversely, FIGS. 4C and 7(c) show a state in which the hub flange 40 twists from the neutral state toward the R2 side relative to the input plate 30, causing compression of the second resin member 522.

[0055] As with the first window portion w1, in the neutral state, the second support portion 302 and the second accommodating portion 402 are arranged offset from each other in the second window portion w2. Second window part w2In this neutral state, the distance between the opposing spring seats 34 is shorter than the free length Sf of the coil spring 51. Therefore, in this neutral state, a torsional torque -t is generated by the compressed coil spring 51, as shown by the dashed line in FIG.

[0056] When torque is input to the damper unit 20 and the hub flange 40 twists relative to the input plate 30 by an offset angle θ0 from the neutral state toward the R1 side, the entire first support portion 301 and the entire first accommodating portion 401 overlap when viewed in the axial direction, and the distance between the opposing spring seats 34 becomes L, which is the same as the free length Sf of the coil spring 51. Therefore, in this state, the torsional torque becomes "0," as shown by the dashed line in FIG. 5.

[0057] Furthermore, when the hub flange 40 is twisted to the R1 side beyond the offset angle θ0, the distance between the pair of spring seats 34 supporting the coil spring 51 again becomes narrower than the free length Sf of the coil spring 51. Therefore, when the twist angle exceeds θ0, the coil spring 51 is compressed from the free length Sf, and the two coil springs 51 Low stiffness due to stiffness k4 (an example of the sixth stiffness) A torsional characteristic T6 (an example of the sixth torsional characteristic) is obtained.

[0058] Next, as shown in Figure 7(b), when the torsion angle becomes θ3 and both end faces of the second resin member 522 abut against the abutment surfaces of the opposing spring seats 34, from this torsion angle θ3 onwards, a high rigidity torsional characteristic T7 (an example of the seventh torsional characteristic) is obtained due to the rigidity k2 (an example of the seventh rigidity) of the second resin member 522.

[0059] On the other hand, when the hub flange 40 twists from the neutral state toward the R2 side, the coil springs 51 are constantly compressed. Therefore, between the torsion angle of 0° on the negative side and the torsion angle −θ4 at which compression of the second resin member 522 begins, the stiffness k4 of the two coil springs 51 provides torsion characteristics with relatively low stiffness, just like on the positive side.

[0060] Next, as shown in FIG. 4C and FIG. 7(c), when both end surfaces of the second resin member 522 come into contact with the contact surfaces of the opposing spring seats 34, Torsion angle -θ4 From now on, Figure 5 As indicated by the dashed dotted line, a high-rigidity torsional characteristic T7 (an example of the seventh torsional characteristic) is obtained due to the rigidity k2 (an example of the seventh rigidity) of the second resin member 522.

[0061] <Composite torsional characteristics> As described above, the damper unit as a whole provides a torsional characteristic (solid line in FIG. 5) that is a combination of the torsional characteristic of the first window portion w1 (dashed line in FIG. 5) and the torsional characteristic of the second window portion w2 (chain line in FIG. 5). That is, in the neutral state, the torsional torque is "0," and in the first operating range (-θ4 to +θ1), a first torsional characteristic T1 with a relatively low first stiffness KL is provided, in the second operating range (positive side range beyond +θ1), a second torsional characteristic T2 with a second high stiffness KHp is provided, and in the third operating range (negative side range beyond -θ4), a third torsional characteristic T3 with a third high stiffness KHn is provided.

[0062] If the first resin member 521 and the second resin member 522 were to have the same overall length, the absolute values ​​of +θ1 and −θ4 in Fig. 5 would be the same. Therefore, in the combined torsional characteristics, the positive operating region and negative operating region of the low torsional characteristics would be the same.

[0063] However, in this embodiment, because the first resin member 521 and the second resin member 522 have different overall lengths, the angle range of (0 to +θ1) is different from the angle range of (0 to -θ4), as shown in FIG. 5. Therefore, in the combined torsional characteristics, the positive side operating region and the negative side operating region of the low torsional characteristics in the first operating region are different. Specifically, in the first operating region, the positive side operating region is wider than the negative side operating region.

[0064] [Other embodiments] The present invention is not limited to the above-described embodiments, and various modifications and alterations are possible without departing from the scope of the present invention.

[0065] (a) By appropriately setting the lengths of the first resin member and the second resin member, it is possible to change the offset amount in the torsional angle direction between the torsional characteristics of the first window portion w1 and the torsional characteristics of the second window portion w2.

[0066] For example, as shown in Figure 8, on the positive side of the torsional characteristics, the positive side high rigidity portion can be made multi-staged by overlapping part of the high rigidity portion of the torsional characteristics of the first window portion w1 (see dashed line) and the torsional characteristics of the second window portion w2 (see dotted line).

[0067] (b) In the above embodiment, each elastic portion is made up of a coil spring and a resin member, but a highly rigid coil spring may be used instead of the resin member.

[0068] (c) The numbers of the housing portions, support portions, coil springs, and resin members are merely examples and are not limited to those in the above-described embodiment. [Explanation of symbols]

[0069] 1 Damper device 30 Input plate (first rotating body) 301,302 1st support part, 2nd support part 40 Hub flange (second rotating body) 401, 402 First storage section, second storage section 50 Elastic connection part 501, 502 First elastic portion, second elastic portion 51 Coil spring (first elastic member, second elastic member) 521, 522 First resin member, second resin member

Claims

1. A first rotating body; a second rotating body that is rotatable relative to the first rotating body; an elastic coupling portion that elastically couples the first rotating body and the second rotating body in a rotational direction; Equipped with The elastic connecting portion is a first torsional characteristic having a first stiffness in a first operating range of torsional angles across positive and negative sides, the first operating range being different between the positive and negative sides; a second torsional characteristic having a second stiffness higher than the first stiffness in a second operating range of a torsional angle, the second operating range being an operating range beyond the positive side of the first operating range; a third torsional characteristic having a third stiffness that is higher than the first stiffness and different from the second stiffness in a third operating range of a torsional angle, the third operating range being an operating range beyond the negative side of the first operating range; and the first rotating body has a first support portion and a second support portion, the second rotating body has a first housing portion provided offset in a first rotation direction with respect to the first support portion, and a second housing portion provided offset in a second rotation direction with respect to the second support portion, The elastic connecting portion is a first elastic member that is pre-compressed and disposed in the first support portion and the first accommodation portion, and that elastically connects the first rotating body and the second rotating body in a rotational direction; a second elastic member that is pre-compressed and disposed in the second support portion and the second accommodation portion, and that elastically connects the first rotating body and the second rotating body in a rotational direction; having Damper device.

2. The damper device according to claim 1 , wherein the first operating region is wider on the positive side than on the negative side.

3. 3. The damper device according to claim 1, wherein the second stiffness of the second torsional characteristic of the elastic connecting portion is higher than the third stiffness of the third torsional characteristic.

4. The elastic connecting portion has a first elastic portion and a second elastic portion that are arranged side by side in the circumferential direction and operate in parallel, The first elastic portion is a fourth torsional characteristic having a fourth stiffness in a fourth operating range of torsional angles across the positive and negative sides, the fourth operating range being different between the positive and negative sides; a fifth torsional characteristic having a fifth stiffness higher than the fourth stiffness in a fifth operating range of a torsional angle, the fifth operating range being an operating range that exceeds the positive side of the fourth operating range and an operating range that exceeds the negative side of the fourth operating range; and The second elastic portion is a sixth torsional characteristic having a sixth stiffness in a sixth operating range of torsional angles across positive and negative sides, the sixth torsional characteristic being offset in the torsional angle direction and the input torque direction relative to the fourth torsional characteristic; a seventh torsional characteristic having a seventh stiffness that is higher than the sixth stiffness and different from the fifth stiffness in a seventh operating range of a torsional angle, the seventh operating range being an operating range that exceeds the positive side of the sixth operating range and an operating range that exceeds the negative side of the sixth operating range; having The damper device according to any one of claims 1 to 3.

5. an offset angle between the first support portion and the first housing portion and an offset angle between the second support portion and the second housing portion are the same; The first elastic member and the second elastic member have the same rigidity. The damper device according to any one of claims 1 to 4.

6. the first elastic member includes a first coil spring and a first elastic body disposed inside the first coil spring and having a length shorter than that of the first coil spring; The second elastic member includes a second coil spring and a second elastic body that is disposed inside the second coil spring and has a length shorter than that of the second coil spring and different from that of the first elastic body. The damper device according to any one of claims 1 to 5.

7. The damper device according to claim 6 , wherein the first elastic body and the second elastic body are made of resin.

8. A first rotating body; a second rotating body that is rotatable relative to the first rotating body; an elastic coupling portion that elastically couples the first rotating body and the second rotating body in a rotational direction; Equipped with The elastic connecting portion is a first torsional characteristic having a first stiffness in a first operating range of torsional angles across positive and negative sides, the first operating range being different between the positive and negative sides; a second torsional characteristic having a second stiffness higher than the first stiffness in a second operating range of a torsional angle, the second operating range being an operating range beyond the positive side of the first operating range; a third torsional characteristic having a third stiffness that is higher than the first stiffness and different from the second stiffness in a third operating range of a torsional angle, the third operating range being an operating range beyond the negative side of the first operating range; and The elastic connecting portion has a first elastic portion and a second elastic portion that are arranged side by side in the circumferential direction and operate in parallel, The first elastic portion is a fourth torsional characteristic having a fourth stiffness in a fourth operating range of torsional angles across the positive and negative sides, the fourth operating range being different between the positive and negative sides; a fifth torsional characteristic having a fifth stiffness higher than the fourth stiffness in a fifth operating range of a torsional angle, the fifth operating range being an operating range that exceeds the positive side of the fourth operating range and an operating range that exceeds the negative side of the fourth operating range; and The second elastic portion is a sixth torsional characteristic having a sixth stiffness in a sixth operating range of torsional angles across positive and negative sides, the sixth torsional characteristic being offset in the torsional angle direction and the input torque direction relative to the fourth torsional characteristic; a seventh torsional characteristic having a seventh stiffness that is higher than the sixth stiffness and different from the fifth stiffness in a seventh operating range of a torsional angle, the seventh operating range being an operating range that exceeds the positive side of the sixth operating range and an operating range that exceeds the negative side of the sixth operating range; having Damper device.

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