Damper Device

Abstract

To suppress the collision noise between outer teeth of a power transmission shaft and inner teeth of a hub flange.SOLUTION: A damper device comprises a hub flange 3, an input rotating body, an elastic member and contact auxiliary mechanisms 51 and 52. The hub flange 3 has inner teeth 311 which are engaged with outer teeth 103 of a power transmission shaft 102. The input rotating body is arranged at the hub flange 3 so as to be rotatable relatively therewith. The elastic member elastically connects the input rotating body and the hub flange 3. The contact auxiliary mechanisms 51 and 52 are constituted so as to make the inner teeth 311 of the hub flange 3 and the outer teeth 103 of the power transmission shaft 102 contact with each other.SELECTED DRAWING: Figure 5

Description

[Technical field]

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

[0002] In vehicles equipped with an engine, a damper device is installed in the power transmission path to suppress engine rotation fluctuations (Patent Document 1). In addition, Patent Document 1 uses a damper device with a torque limiter function to prevent excessive torque from being transmitted from the output side to the engine side when starting the engine, etc.

[0003] The damper device is attached to the flywheel. A power transmission shaft (e.g., an input shaft of a transmission) is spline-fitted into a spline hole formed in the center of the damper device. In detail, the internal teeth of a hub flange of the damper device mesh with the external teeth of the power transmission shaft, thereby spline-fitting the power transmission shaft into the damper device. In this way, power from the damper device is transmitted to the power transmission shaft. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2011-226572 A Summary of the Invention [Problem to be solved by the invention]

[0005] The above-mentioned damper device has a problem in that, when there is no load, fluctuations in engine rotation cause the external teeth of the power transmission shaft to collide with the internal teeth of the hub flange, generating a collision noise.

[0006] Therefore, an object of the present invention is to suppress the above-mentioned collision noise. [Means for solving the problem]

[0007] A damper device according to one aspect of the present invention is configured to be attached to a power transmission shaft having external teeth. The damper device includes a hub flange, an input rotor, an elastic member, and a contact assist mechanism. The hub flange has internal teeth that mesh with the external teeth of the power transmission shaft. The input rotor is arranged to be rotatable relative to the hub flange. The elastic member elastically connects the input rotor and the hub flange. The contact assist mechanism is configured to bring the internal teeth of the hub flange into contact with the external teeth of the power transmission shaft.

[0008] With this configuration, the contact assist mechanism brings the internal teeth of the hub flange and the external teeth of the power transmission shaft into contact with each other, so that even if there is a fluctuation in engine speed when there is no load, the contact state between the internal teeth and the external teeth is maintained, and the generation of collision noise between the internal teeth and the external teeth can be suppressed.

[0009] Preferably, the contact assist mechanism is a biasing means for biasing the hub flange to incline the rotation axis of the hub flange relative to the rotation axis of the power transmission shaft.

[0010] Preferably, the biasing means has a first biasing member and a second biasing member. The first biasing member biases the hub flange toward the first axial side. The second biasing member is disposed at a distance from the first biasing member in the circumferential direction. The second biasing member biases the hub flange toward the second axial side.

[0011] Preferably, the elastic member has a first elastic member and a second elastic member. The first elastic member is arranged in a compressed state so as to bias the input rotating body in the first rotation direction. The second elastic member is arranged in a compressed state so as to bias the input rotating body in the second rotation direction. The second elastic member has a rigidity smaller than that of the first elastic member. The contact assist mechanism is constituted by the first and second elastic members.

[0012] Preferably, the damper device further includes a weight member attached to a portion of an outer circumferential end of the hub flange. The contact assist mechanism is constituted by the weight member. Effect of the Invention

[0013] According to the present invention, it is possible to suppress the generation of collision noise between the internal teeth of the hub flange and the external teeth of the power transmission shaft. [Brief description of the drawings]

[0014] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] Schematic diagram showing the positional relationship between the input rotor and the hub flange [Figure 4] Front view of the hub flange. [Diagram 5] FIG. [Figure 6] FIG. 4 is a diagram showing a contact state between the internal teeth and the external teeth on a first axial side. [Figure 7] 13 is a diagram showing a contact state between the internal teeth and the external teeth on a second axial side. FIG. [Figure 8] FIG. 11 is a front view of a hub flange according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The damper device according to this embodiment will be described below with reference to the drawings. In the following description, the axial direction is the direction in which the rotation axis of the damper device extends. The circumferential direction is the circumferential direction of a circle centered on the rotation axis, and the radial direction is the radial direction of a circle centered on the rotation axis.

[0016] [Overall configuration] 1 and 2 are cross-sectional views of a damper device 100 with a torque limiter according to this embodiment (hereinafter simply referred to as a "damper device"). In Fig. 1 and Fig. 2, an engine (not shown) is disposed on the left side of the damper device 100, and a drive unit (not shown) including an electric motor, a transmission, etc. is disposed on the right side.

[0017] This damper device 100 is provided between a flywheel 101 and an input shaft 102 (an example of a power transmission shaft) of a drive unit, and is a device for limiting the torque transmitted between the engine and the drive unit and for damping rotational fluctuations.

[0018] The flywheel 101 has an inertia ring 1011 and a flexible plate 1012. The damper device 100 is fixed to the inertia ring 1011 by bolts or the like.

[0019] The damper device 100 includes a torque limiter unit 10 and a damper unit 20 .

[0020] [Torque limiter unit 10] The torque limiter unit 10 is disposed radially outward from the damper unit 20. The torque limiter unit 10 limits the torque transmitted between the flywheel 101 and the damper unit 20. The torque limiter unit 10 has a support plate 11, a friction disc 13, a pressure plate 14, and a cone spring 15.

[0021] The support plate 11 is fixed at its outer periphery to the flywheel 101. In detail, the support plate 11 is fixed to an inertia ring 1011 of the flywheel 101 by a plurality of bolts 16.

[0022] The friction disc 13, the pressure plate 14, and the cone spring 15 are disposed axially between the support plate 11 and the annular protrusion 1013 of the flywheel 101. The annular protrusion 1013 protrudes radially inward from the inner circumferential surface of the inertia ring 1011. The annular protrusion 1013 is annular and extends in the circumferential direction.

[0023] The friction disc 13 has a core plate and a pair of friction members fixed to both side surfaces of the core plate. The inner periphery of the friction disc 13 is fixed to the damper unit 20 by a plurality of rivets 17. The pressure plate 14 and the cone spring 15 are disposed between the friction disc 13 and the annular projection 1013.

[0024] The pressure plate 14 is annular. The pressure plate 14 is disposed on the annular protrusion 1013 side with respect to the friction disc 13.

[0025] The cone spring 15 is disposed between the pressure plate 14 and the annular protrusion 1013. The cone spring 15 presses the friction disc 13 against the support plate 11 via the pressure plate 14.

[0026] [Damper unit 20] The damper unit 20 has an input rotor 2, a hub flange 3, a plurality of elastic members 4, a contact assist mechanism 5, and a hysteresis generating mechanism 6.

[0027] <Input rotor 2> The input rotor 2 is disposed rotatably about a rotation axis O. The input rotor 2 has a first input plate 21 and a second input plate 22. The first input plate 21 and the second input plate 22 are formed in a disk shape having a hole in the center, and are disposed at a distance from each other in the axial direction. The first input plate 21 and the second input plate 22 cannot rotate relative to each other, and cannot move axially relative to each other.

[0028] Fig. 3 is a schematic diagram showing the positional relationship between the input rotor 2 and the hub flange 3. As shown in Fig. 3, the first input plate 21 and the second input plate 22 each have a pair of first support portions 23 and a pair of second support portions 24. The first support portions 23 of the first input plate 21 and the first support portions 23 of the second input plate 22 are formed at the same position and have the same shape. Similarly, the second support portions 24 of the first input plate 21 and the second support portions 24 of the second input plate 22 are formed at the same position and have the same shape.

[0029] The pair of first support parts 23 are disposed on opposite sides of each other around the rotation axis O. That is, the pair of first support parts 23 are disposed at a pitch of 180 degrees from each other around the rotation axis O. The pair of second support parts 24 are disposed at a pitch of 180 degrees from each other around the rotation axis O. The first support part 23 and the second support part 24 are disposed at a pitch of 90 degrees from each other around the rotation axis O. Each support part 23, 24 has a hole penetrating in the axial direction and edges cut and raised on the inner and outer circumferential edges of the hole.

[0030] The first support portion 23 has an R1 support surface 231 at an end portion on the first rotation direction side (hereinafter simply referred to as the "R1 side"), and an R2 support surface 232 at an end portion on the second rotation direction side (hereinafter simply referred to as the "R2 side"). The second support portion 24 has an R1 support surface 241 at an end portion on the first rotation direction side, and an R2 support surface 242 at an end portion on the second rotation direction side.

[0031] The length of each of the support portions 23, 24 in the circumferential direction (the distance between the R1 support surface and the R2 support surface) is L. Furthermore, with each of the support surfaces 231, 232, 241, 242, an end face of an elastic member 4, which will be described later, can abut.

[0032] In FIG. 3, the first support portion 23 and the second support portion 24 are indicated by solid lines, and a first receiving portion 33 and a second receiving portion 34 of the hub flange 3, which will be described later, are indicated by dashed lines.

[0033] <Hub flange 3> As shown in Figures 1 and 2, the hub flange 3 has a hub 31 and a flange 32. The hub flange 3 is disposed rotatably about a rotation axis O. The hub flange 3 is rotatable within a predetermined angular range relative to the input rotor 2. Note that a stopper mechanism prevents the hub flange 3 from rotating relative to the input rotor 2 beyond the predetermined angular range.

[0034] The hub 31 is formed in a cylindrical shape and has a spline hole formed in the center. That is, the hub 31 has internal teeth 311 on its inner peripheral surface. The input shaft 102 is spline-fitted into the spline hole of the hub 31. That is, the input shaft 102 has external teeth 103 on its outer peripheral surface. The internal teeth 311 of the hub 31 mesh with the external teeth 103 of the input shaft 102. The input shaft 102 is cylindrical and made of a solid material.

[0035] The hub 31 passes through holes in the centers of the first input plate 21 and the second input plate 22 .

[0036] The flange 32 has a disk shape and is disposed between the first input plate 21 and the second input plate 22 in the axial direction.

[0037] The flange 32 extends radially outward from the outer circumferential surface of the hub 31. The flange 32 is formed integrally with the hub 31. That is, the flange 32 and the hub 31 are configured as a single member. Therefore, the hub 31 and the flange 32 rotate integrally. Note that in this embodiment, the hub 31 and the flange 32 are configured as a single member, but they may each be configured as separate members.

[0038] Fig. 4 is a front view of the hub flange. As shown in Fig. 4, the hub flange 3 has a pair of first receiving portions 33 and a pair of second receiving portions 34. The hub flange 3 also has a plurality of notches 35.

[0039] As shown in Fig. 3, the pair of first housing portions 33 are disposed at positions corresponding to the pair of first support portions 23. The pair of second housing portions 34 are disposed at positions corresponding to the pair of second support portions 24. More specifically, in a neutral state (torsion angle 0°) in which the relative rotation angle between the input rotor 2 and the hub flange 3 is 0° and they are not twisted, the pair of first housing portions 33 are disposed so as to overlap with the first support portions 23 as viewed in the axial direction and offset by an angle θ1 to the R1 side. The second housing portion 34 is disposed so as to overlap with the second support portions 24 as viewed in the axial direction and offset by an angle θ1 to the R2 side.

[0040] Each of the housing sections 33, 34 is a substantially rectangular hole with an arc-shaped outer periphery. As shown in Fig. 3, the first housing section 33 has an R1 housing surface 331 at the end on the R1 side, and an R2 housing surface 332 at the end on the R2 side. The second housing section 34 has an R1 housing surface 341 at the end on the R1 side, and an R2 housing surface 342 at the end on the R2 side.

[0041] The length of the hole of each of the accommodating portions 33, 34 in the circumferential direction (the distance between the R1 accommodating surface 331, 341 and the R2 accommodating surface 332, 342) is set to L, which is the same as the length of the hole of each of the support portions 23, 24. An end face of the elastic member 4, which will be described later, can abut against each of the accommodating surfaces 331, 332, 341, 342.

[0042] As shown in Fig. 4, the notch 35 is disposed between the accommodating portions 33, 34 adjacent to each other in the circumferential direction. The notch 35 is formed at a predetermined depth radially inward from the outer circumferential surface of the flange 32. The positions at which each notch 35 is formed correspond to the positions of the rivets 17 for connecting the friction disc 13 and the first input plate 21. Therefore, the torque limiter unit 10 and the damper unit 20, which are assembled in separate processes, can be fixed with the rivets 17 by using the assembly holes 221 of the second input plate 22 and the notches 35 of the flange 32.

[0043] <Elastic member 4> As shown in Fig. 1, the elastic member 4 is configured to elastically connect the input rotor 2 and the hub flange 3. The elastic member 4 is, for example, a coil spring. As shown in Fig. 4, the elastic member 4 is accommodated in each of the accommodation portions 33, 34 of the flange 32, and is supported in the radial and axial directions by each of the support portions 23, 24 of the input rotor 2. Both ends of the elastic member 4 are supported by spring seats 41.

[0044] Of the elastic members 4, the one housed in the first housing portion 33 is referred to as a first elastic member 4a, and the one housed in the second housing portion 34 is referred to as a second elastic member 4b. These elastic members 4 operate in parallel.

[0045] Moreover, all of the elastic members 4 have the same free length Sf. The free length Sf of the elastic members 4 is the same as the length L of each of the support portions 23, 24 and each of the housing portions 33, 34. Moreover, each of the elastic members 4 has the same rigidity.

[0046] <Accommodated state of elastic member 4> Hereinafter, the arrangement of the support parts 23, 24 and the housing parts 33, 34 in the neutral state, and the housing state of each elastic member 4 will be described in detail. In the following description, the first support part 23 and the first housing part 33 may be referred to as the "first window set w1," and the second support part 24 and the second housing part 34 may be referred to as the "second window set w2."

[0047] 3, in the neutral state, the pair of first housing portions 33 are offset by angle θ1 toward the R1 side with respect to the corresponding first support portion 23. Meanwhile, the pair of second housing portions 34 are offset by angle θ1 toward the R2 side with respect to the second support portion 24. The elastic member 4 is mounted in a compressed state in openings (holes penetrating in the axial direction) of the portions where the support portions 23, 24 and the corresponding housing portions 33, 34 overlap in the axial direction.

[0048] 3, in the neutral state, in the pair of first window sets w1, the R1 side end face of the first elastic member 4a abuts against the R1 support surface 231, and the R2 side end face abuts against the R2 housing surface 332. In other words, the first elastic member 4a biases the input rotor 2 against the hub flange 3 in the first rotational direction R1.

[0049] On the other hand, in the pair of second window sets w2, the second elastic member 4 b The R1 side end face of the second elastic member 4b abuts against the R1 housing surface 341, and the R2 side end face of the second elastic member 4b abuts against the R2 support surface 242. That is, the second elastic member 4b biases the input rotor 2 against the hub flange 3 in the second rotational direction R2.

[0050] <Hiss Generation Mechanism 6> As shown in FIG. 2, the hysteresis generating mechanism 6 has a first bush 61, a second bush 62, a contact plate 63, and a cone spring 64.

[0051] The first bush 61 is disposed axially between the first input plate 21 and the flange 32. A friction member is fixed to a friction surface of the first bush 61 which comes into contact with the first input plate 21.

[0052] The second bush 62 and the abutment plate 63 are disposed between the second input plate 22 and the flange 32 in the axial direction. The abutment plate 63 is disposed between the second bush 62 and the flange 32. The abutment plate 63 is disk-shaped and has an opening in the center. A friction member is fixed to the friction surface of the abutment plate 63 that comes into contact with the flange 32.

[0053] A plurality of engagement protrusions 621 protruding in the axial direction are formed on the surface of the second bush 62 facing the second input plate 22 (see FIG. 1), and these engagement protrusions 621 engage with engagement holes of the second input plate 22. The cone spring 64 is disposed in a compressed state between the second bush 62 and the second input plate 22 in the axial direction.

[0054] With the above configuration, the first bushing 61 is pressed against the first input plate 21, and the contact plate 63 is pressed against the flange 32. Therefore, when relative rotation occurs between the input rotor 2 and the hub flange 3, a hysteresis torque is generated between them.

[0055] <Contact assist mechanism> Fig. 5 is an enlarged cross-sectional view for explaining the contact assist mechanism. In Fig. 5, the first axial side means the left side of Fig. 5, and the second axial side means the right side of Fig. 5. As shown in Fig. 5, the contact assist mechanism 5 is configured to bring the internal teeth 311 of the hub flange 3 into contact with the external teeth 103 of the input shaft 102.

[0056] The contact assist mechanism 5 is constituted by a biasing means. In detail, the contact assist mechanism 5 is constituted by a first biasing member 51 and a second biasing member 52. The first biasing member 51 and the second biasing member 52 bias the hub flange 3 to tilt. By tilting the hub flange 3 by the first biasing member 51 and the second biasing member 52, the rotation axis of the hub flange 3 tilts with respect to the rotation axis of the input shaft 102.

[0057] The first biasing member 51 and the second biasing member 52 are, for example, coil springs. The first biasing member 51 biases the hub flange 3 to a first side in the axial direction. The first biasing member 51 is disposed on a second side in the axial direction with respect to the flange 32 of the hub flange 3.

[0058] The first biasing member 51 is disposed between the flange 32 and the abutment plate 63 in the axial direction. The flange 32 has a first accommodating recess 36 on a surface facing the second axial side. A part of the first biasing member 51 is accommodated in this first accommodating recess 36. In addition, the abutment plate 63 has a second accommodating recess 631 on a surface facing the first axial side. A part of the first biasing member 51 is accommodated in this second accommodating recess 631.

[0059] The second biasing member 52 is disposed at an interval in the circumferential direction from the first biasing member 51. Preferably, the second biasing member 52 is disposed at an interval of approximately 180 degrees from the first biasing member 51 in the circumferential direction.

[0060] The second biasing member 52 biases the hub flange 3 toward the second axial side. That is, the biasing direction of the second biasing member 52 is opposite to the biasing direction of the first biasing member 51. The second biasing member 52 is disposed on the first axial side with respect to the flange 32 of the hub flange 3.

[0061] The second biasing member 52 is disposed between the flange 32 and the first bush 61 in the axial direction. The flange 32 has a third accommodating recess 37 on a surface facing the first axial side. A part of the second biasing member 52 is accommodated in this third accommodating recess 37. The first bush 61 has a fourth accommodating recess 611 on a surface facing the second axial side. A part of the second biasing member 52 is accommodated in this fourth accommodating recess 611.

[0062] By biasing the hub flange 3 with the first biasing member 51 and the second biasing member 52, the hub flange 3 is tilted so that the rotation axis of the hub flange 3 is inclined relative to the rotation axis of the input shaft 102. As a result, the internal teeth 311 and the external teeth 103 come into contact with each other.

[0063] Fig. 6 is an enlarged view showing a contact state between the internal teeth 311 and the external teeth 103 on the first axial side. Note that the scale has been changed in Fig. 6 to make the contact state easier to understand. As shown in Fig. 6, the internal teeth 311 and the external teeth 103 are in contact with each other at a midpoint between the first biasing member 51 and the second biasing member 52 in the circumferential direction.

[0064] In detail, among the tooth surfaces of the internal teeth 311, the tooth surfaces facing the second biasing member 52 side (the lower side in FIG. 6) are in contact with the external teeth 103. In addition, among the tooth surfaces of the external teeth 103, the tooth surfaces facing the first biasing member 51 side (the upper side in FIG. 6) are in contact with the internal teeth 311.

[0065] Fig. 7 is an enlarged view showing a contact state between the internal teeth 311 and the external teeth 103 on the second axial side. Note that the scale has been changed in Fig. 7 to make the contact state easier to understand. As shown in Fig. 7, the internal teeth 311 and the external teeth 103 are in contact with each other at a midpoint between the first biasing member 51 and the second biasing member 52 in the circumferential direction.

[0066] In detail, among the tooth surfaces of the internal teeth 311, the tooth surfaces facing the first biasing member 51 side (upper side in FIG. 7) are in contact with the external teeth 103. In addition, among the tooth surfaces of the external teeth 103, the tooth surfaces facing the second biasing member 52 side (lower side in FIG. 7) are in contact with the internal teeth 311.

[0067] As described above, the hub flange 3 is biased to tilt by the first biasing member 51 and the second biasing member 52, so that the internal teeth 311 and the external teeth 103 are in contact. As a result, even if there is a rotational fluctuation of the engine when there is no load, the contact between the internal teeth 311 and the external teeth 103 is maintained, and it is possible to suppress the generation of collision noise between the internal teeth 311 and the external teeth 103. Note that when there is no load, this means that the torque transmitted by the damper device 100 is zero.

[0068] [Variations] 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.

[0069] (a) In the above embodiment, the contact assist mechanism 5 is configured by the first biasing member 51 and the second biasing member 52, but the configuration of the contact assist mechanism is not limited to this. For example, the contact assist mechanism can be configured by the above-mentioned first elastic member 4a and second elastic member 4b.

[0070] In this case, the biasing force of the first elastic member 4a biasing the hub flange 3 in the first rotational direction is made greater than the biasing force of the second elastic member 4b biasing the hub flange 3 in the second rotational direction. In other words, the rigidity of the first elastic member 4a is made greater than the rigidity of the second elastic member 4b. If each of the elastic members 4a, 4b is a coil spring, the spring constant of the first elastic member 4a is made greater than the spring constant of the second elastic member 4b.

[0071] As a result, the hub flange 3 is biased in the first rotational direction, and the internal teeth 311 of the hub flange 3 come into contact with the external teeth 103 of the input shaft 102. As a result, even if there is a rotational fluctuation in the engine when there is no load, the contact between the internal teeth 311 and the external teeth 103 is maintained, and the generation of collision noise between the internal teeth 311 and the external teeth 103 can be suppressed.

[0072] (b) In the above embodiment, the contact assist mechanism 5 is configured by the first biasing member 51 and the second biasing member 52, but the configuration of the contact assist mechanism is not limited to this. For example, as shown in FIG. 8, the contact assist mechanism 5' can be configured by a weight member 53. The weight member 53 is attached to a portion of the outer periphery of the hub flange 3'. In other words, the weight member 53 does not extend around the entire outer periphery of the hub flange 3'.

[0073] In this way, because the weight member 53 is attached only to a portion of the outer periphery of the hub flange 3', the hub flange 3' rotates eccentrically. That is, the rotation axis of the hub flange 3' is offset from the rotation axis of the input shaft 102'. Therefore, when the damper device rotates, the internal teeth of the hub flange 3' come into contact with the external teeth of the input shaft 102' at a position spaced 180 degrees from the position where the weight member 53 is attached. As a result, even if there is a fluctuation in engine rotation when there is no load, the contact between the internal teeth and the external teeth can be maintained, and the generation of collision noise between the internal teeth and the external teeth can be suppressed. [Explanation of symbols]

[0074] 2: Input rotor 3: Hub flange 311: inside teeth 4 : Elastic material 4a: First elastic member 4b: Second elastic member 5: Contact assistance mechanism 51: First biasing member 52: Second biasing member 53: Weight member 100: Damper device 102: Input shaft 103: External teeth

Claims

1. A damper device attached to a power transmission shaft having external teeth, a hub flange having internal teeth that mesh with the external teeth of the power transmission shaft; an input rotor arranged to be rotatable relative to the hub flange; an elastic member that elastically connects the input rotor and the hub flange; a contact assist mechanism configured to bring the internal teeth of the hub flange into contact with the external teeth of the power transmission shaft; Equipped with the contact assist mechanism is a biasing means that biases the hub flange so that the rotation axis of the hub flange is inclined relative to the rotation axis of the power transmission shaft. Damper device.

2. The biasing means is a first biasing member that biases the hub flange toward a first side in the axial direction; a second biasing member disposed at a distance from the first biasing member in the circumferential direction and biasing the hub flange toward a second side in the axial direction; having The damper device according to claim 1 .

3. A damper device attached to a power transmission shaft having external teeth, a hub flange having internal teeth that mesh with the external teeth of the power transmission shaft; an input rotor arranged to be rotatable relative to the hub flange; an elastic member that elastically connects the input rotor and the hub flange; a contact assist mechanism configured to bring the internal teeth of the hub flange into contact with the external teeth of the power transmission shaft; Equipped with The elastic member is a first elastic member disposed in a compressed state so as to bias the input rotor in a first rotational direction; a second elastic member disposed in a compressed state so as to bias the input rotor in a second rotational direction, the second elastic member having a rigidity smaller than that of the first elastic member; having The contact assist mechanism is constituted by the first and second elastic members. Damper device.

4. A damper device attached to a power transmission shaft having external teeth, a hub flange having internal teeth that mesh with the external teeth of the power transmission shaft; an input rotor arranged to be rotatable relative to the hub flange; an elastic member that elastically connects the input rotor and the hub flange; a contact assist mechanism configured to bring the internal teeth of the hub flange into contact with the external teeth of the power transmission shaft; a weight member attached to a portion of an outer peripheral end portion of the hub flange; Equipped with The contact assist mechanism is constituted by the weight member. Damper device.

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