Damper device and assembly method thereof

Abstract

To enable easy attachment of elastic members in a damper device having the plurality of elastic members compressed beforehand.SOLUTION: In an assembly method, a first support part of a first rotating body and a first accommodation part of a second rotating body are superposed on each other viewed in the axial direction so as to remove an offset, and a first elastic member is disposed in the first support part and the first accommodation part superposed on each other. By rotating the second rotating body to a first rotating direction side relative to the first rotating body while the first elastic member is compressed, a second support part and a second accommodation part are superposed on each other viewed in the axial direction so as to remove an offset, and a second elastic member is disposed in the second support part and the second accommodation part superposed on each other. While the second elastic member is compressed, the second rotating body is rotated to a second rotating direction side to the first rotating body only by an offset angle.SELECTED DRAWING: Figure 5B

Description

[Technical Field]

[0001] The present invention relates to a damper device and an assembly method thereof. [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] In hybrid vehicles, the motor may be driven to warm up the engine. At this time, a damper device installed between the motor and the engine operates across both positive and negative torsional operating ranges due to engine rotation fluctuations. As a result, the relative rotation direction between the input and output rotors in the damper device alternates, resulting in power transfer between the components constituting these rotors, generating impact noise. Furthermore, if a gear train is installed to change the motor's rotation speed, noise may also be generated by the gear pairs that make up the gear train for the same reason.

[0007] Therefore, the inventors have proposed a damper device that can suppress the noise generated when operating across both positive and negative torsional ranges, and have already filed a patent application (Patent Application No. 2020-134863).

[0008] This damper device has an elastic connecting portion that elastically connects the first rotating body and the second rotating body in the rotational direction. The elastic connecting portion has a first elastic member and a second elastic member that are pre-compressed and arranged in a neutral state where there is no torsion due to relative rotation between the first rotating body and the second rotating body. Here, in the neutral state, torques in opposite directions are applied to each member by the first and second elastic members, so that the generation of abnormal noise can be suppressed in a predetermined torsional range, including when in the neutral state.

[0009] In such a damper device, the first and second elastic members must be compressed in advance before being assembled to the first and second rotating bodies, which requires some ingenuity in the assembly work.

[0010] An object of the present invention is to provide a damper device having a plurality of pre-compressed elastic members that can be easily assembled. [Means for solving the problem]

[0011] (1) A method for assembling a damper device according to the present invention is a method for assembling a damper device including a first rotating body, a second rotating body, a first elastic member, and a second elastic member. The first rotating body has a first support portion and a second support portion. The second rotating body is rotatable relative to the first rotating body and has a first accommodating portion and a second accommodating portion. The first accommodating portion is provided offset in a first rotation direction from the first support portion. The second accommodating portion is provided offset in a second rotation direction from the second support portion. The first elastic member is pre-compressed and arranged in the first support portion and the first accommodating portion. The second elastic member is pre-compressed and arranged in the second support portion and the second accommodating portion.

[0012] The method for assembling this damper device includes the following steps.

[0013] First step: The first support portion of the first rotor and the first housing portion of the second rotor are overlapped when viewed in the axial direction so that there is no offset.

[0014] Second step: A first elastic member is placed on the first support portion and the first housing portion which are overlapped with each other.

[0015] Third step: While compressing the first elastic member, the second rotor is rotated relative to the first rotor in the first rotation direction to overlap the second support portion and the second accommodating portion in the axial direction so that there is no offset between them.

[0016] Fourth step: The second elastic member is placed on the second support portion and the second accommodating portion which are overlapped with each other.

[0017] Fifth step: While compressing the second elastic member, the second rotating body is rotated in the second rotation direction relative to the first rotating body. 2 Support and 2 Rotate it by the offset angle with respect to the storage section.

[0018] (2) Preferably, in each step, the first rotor is fixed to the first jig so as not to be rotatable.

[0019] (3) Preferably, the assembly method further includes the step of preparing a second jig. The second jig includes a second rotating body It can rotate around the center of rotation of the second body is rotated in the first rotation direction in the third step, and is rotated in the second rotation direction in the fifth step.

[0020] (4) Preferably, the first jig has a fixing portion, and the second jig has a pressing portion. The fixing portion prevents rotation of an end face of the first elastic member on the first rotation direction side. The pressing portion can abut against an end face of the first elastic member on the second rotation direction side, thereby compressing the first elastic member.

[0021] (5) Preferably, the damper device further includes a first sheet member and a second sheet member. The first sheet member supports an end face of the first elastic member on the first rotation direction side. The second sheet member supports an end face of the first elastic member on the second rotation direction side. In this case, the fixing portion of the first jig and the pressing portion of the second jig are removably attached to the first sheet member and the second sheet member. Then, in the third and fifth steps, the fixing portion attached to the first sheet member is brought into contact with the end face of the first elastic member to restrict movement of the end face of the first elastic member on the first rotation direction side, and the pressing portion attached to the second sheet member is brought into contact with the end face of the first elastic member to restrict movement of the end face of the first elastic member on the first rotation direction side. End face on the second direction side The first elastic member is brought into contact with the first elastic member to operate the first elastic member.

[0022] (6) Preferably, the distance between the first sheet member and the second sheet member is the same as the free length of the first elastic member.

[0023] (7) 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.

[0024] (8) A damper device according to the present invention includes a first rotating body, a second rotating body, a first elastic member, a second elastic member, and a pair of sheet members. The first rotating body has a first support portion and a second support portion. The second rotating body is rotatable relative to the first rotating body and has a first accommodating portion and a second accommodating portion. The first accommodating portion is provided offset in a first rotation direction from the first support portion. The second accommodating portion is provided offset in a second rotation direction from the second support portion. The first elastic member is pre-compressed and disposed 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 disposed 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. The pair of sheet members support both end surfaces of the first elastic member and have assembly holes. A jig for controlling the operation of the first elastic member when assembling the first elastic member and the second elastic member can be removably attached to the assembly hole.

[0025] Here, a jig can be attached to the assembly hole provided in the sheet member. Then, when assembling the elastic member, this jig can be used to rotate the first rotating body and the second rotating body relative to each other so that the offset between the support parts and the housing parts is eliminated. Therefore, in a device in which the support parts and the housing parts are offset, when assembling a pre-compressed elastic member to this part, the elastic member can be easily assembled.

[0026] (9) Preferably, the assembly hole of the sheet member is formed so that the attached jig can come into contact with the end face of the first elastic member and press the first elastic member.

[0027] In this case, the jig is directly applied to the end face of the first elastic member, and the first and second rotating bodies can be rotated relative to each other via the first elastic member. In other words, the pressing force of the jig does not act on the sheet member. Therefore, there is no need to increase the strength of the sheet member. [Effects of the Invention]

[0028] According to the present invention as described above, in a damper device having a plurality of pre-compressed elastic members, the elastic members can be easily assembled. [Brief explanation of the drawings]

[0029] [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 4] FIG. [Figure 5A] FIG. [Figure 5B] FIG. [Figure 5C] FIG. [Figure 5D] FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. [Figure 10A] FIG. 4 is a diagram showing the torsional characteristics of the damper unit. [Figure 10B] FIG. 4 is a diagram showing the torsional characteristics of the damper unit. [Figure 10C] FIG. 4 is a diagram showing the torsional characteristics of the damper unit. DETAILED DESCRIPTION OF THE INVENTION

[0030] [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.

[0031] 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.

[0032] 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.

[0033] [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.

[0034] [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.

[0035] <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.

[0036] 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.

[0037] As shown in FIG. 2 and FIG. 3, which illustrates 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 includes a hole penetrating in the axial direction and raised edges at the inner and outer circumferential edges of the hole. Each support portion 301, 302 has recesses 301a, 302a formed on both circumferential end surfaces thereof that bulge outward in the circumferential direction.

[0038] <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.

[0039] The flange 42 has four stopper projections 42 b, a pair of first and second receiving portions 401 and 402 , and four notches 403 .

[0040] 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.

[0041] As shown in FIG. 2 and FIG. 3, which shows the hub flange 40, the pair of first housing portions 401 are disposed opposite each other across the rotation axis O. The pair of second housing portions 402 are disposed circumferentially between the two first housing portions 401, facing each other across the rotation axis O. The housing portions 401, 402 have the same shape and are substantially rectangular holes with arc-shaped outer peripheries. Recesses 401a, 402a that bulge outward in the circumferential direction are formed on both circumferential end surfaces of each housing portion 401, 402.

[0042] 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.

[0043] <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).

[0044] 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 θ1 toward the first rotation direction side (hereinafter simply referred to as the "R1 side"). That is, the first housing portion 401 is disposed so as to be offset by an angle θ1 toward the R1 side with respect to a 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 is offset by an angle θ1 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 θ1 toward the R2 side with respect to a line C2.

[0045] <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"), respectively, so as to face each other.

[0046] As shown in FIG. 4, the spring seat 34 has a disk-shaped support surface 34a, an outer support portion 34b, an inner support portion 34c, a protrusion 34d, and a pin insertion portion 34e. The outer support portion 34b extends circumferentially from the radially outer end of the support surface 34a and has an arc-like shape that bulges radially outward. The inner support portion 34c extends circumferentially from the radially inner end of the support surface 34a and has an arc-like shape that bulges radially inward. The protrusion 34d is cylindrical and protrudes circumferentially from the center of the support surface 34a. The pin insertion portion 34e bulges from the support surface 34a toward the opposite side to the protrusion 34d and extends axially. An axially extending through groove 34f is formed in the pin insertion portion 34e. The through groove 34f has a substantially semicircular cross section and is open in the direction in which the protrusion 34d protrudes.

[0047] An end face of a coil spring 51 (described later) abuts against the support surface 34a of the spring seat 34. The outer and inner peripheral portions of the coil spring 51 are supported by the outer peripheral support portion 34b and the inner peripheral support portion 34c. The protrusion 34d extends into the coil spring 51. A pin of a jig (described later) is inserted into the through groove 34f of the pin insertion portion 34e when assembling the coil spring 51. The pin inserted into the through groove 34f can directly press against the end face of the coil spring 51.

[0048] 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 support surfaces 34a of the opposing spring seats 34 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 support surfaces 34a of the opposing spring seats 34 is set to L.

[0049] <Elastic connecting portion 50> The elastic connecting portion 50 has four coil springs 51 (an example of the first elastic member and the second elastic member) and four resin members 52. Each coil spring 51 has an outer spring and an inner 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.

[0050] All four coil springs 51 have the same free length Sf, which is the same as the distance L between the support surfaces 34a of the opposing spring seats 34 attached to the windows w1 and w2 when the offset angle is "0."

[0051] <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.

[0052] As described above, in the neutral state, the pair of first housing portions 401 are offset by angle θ1 toward the R1 side relative to the corresponding first support portion 301. Meanwhile, the pair of second housing portions 402 are offset by angle θ1 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 each corresponding housing portion 401, 402.

[0053] [Assembly method] A method for assembling the damper unit 20 of the damper device 1 described above will be explained using the drawings from Fig. 5 onwards. Figs. 5A to 5D schematically show the hub flange 40, the spring seat 34, and the coil spring 51. Note that in the following explanation, the assembly of the members that make up the hysteresis generating mechanism 60 will be omitted.

[0054] <Preparing the jig> First, a first jig 71 and a second jig 72 are prepared as shown in Fig. 6. The first jig 71 is disk-shaped and has an opening 71a in the center. The opening 71a has a circular hole formed in the center and a pair of elongated holes extending radially outward from the hole in opposite directions. The pair of elongated holes are arranged offset in the circumferential direction.

[0055] The first jig 71 also has four fixing pins 71b and two movement restricting pins 71c. The fixing pins 71b and the movement restricting pins 71c are formed to protrude upward from the surface of the first jig 71. The fixing pins 71b can be inserted into the rivet holes 31c of the first plate 31. The movement restricting pins 71c can be inserted into the through grooves 34f of the spring seat 34.

[0056] The second jig 72 is disposed within the opening 71a of the first jig 71 and includes a disk portion 72a and a pair of arms 72b. The disk portion 72a is circular and has a spline hole 72c formed in the center for rotating the second jig 72. The pair of arms 72b extend radially outward in opposite directions from the outer periphery of the disk portion 72a. A pressing pin 72d is provided at the radially outer end of each of the pair of arms 72b and protrudes upward.

[0057] The first jig 71 as described above is fixed on a table (not shown). A rotatable spline shaft (not shown) is provided on the table. The second jig 72 is then inserted into the opening 71a of the first jig 71, and the spline shaft is inserted into the spline hole 72c. This allows the spline shaft to be rotated, and the second jig 72 can be rotated by a predetermined angle within the opening 71a of the first jig 71.

[0058] <Set of 31 first plates> As shown in Fig. 7, the first plate 31 is set in the first jig 71. Specifically, the fixing pins 71b of the first jig 71 are inserted into the rivet holes 31c of the first plate 31, and the first plate 31 is fixed to the first jig 71 so that it cannot rotate. In this state, the movement restricting pin 71c of the first jig 71 and the pressing pin 72d of the second jig 72 are both located inside the first support part 301. Thereafter, the first bushing (omitted in Fig. 7) is assembled.

[0059] <Set of 40 hub flanges> 5A and 8, the hub flange 40 is set. Specifically, the hub flange 40 is set so that the entire first support portion 301 of the first plate 31 and the entire first housing portion 401 of the hub flange 40 overlap when viewed in the axial direction. In other words, the hub flange 40 is rotated by an angle θ1 from the neutral position toward the R2 side, and set so that the offset angle is "0".

[0060] <Set of spring seat 34 and coil spring 51 in first window portion w1> 5A and 9, the spring seats 34 are set in the first window w1 and the second window w2. At this time, the spring seats 34 are set so that the movement restricting pin 71c passes through the through groove 34f of the spring seat 34 (an example of a first seat member) on the R1 side in the first window w1, and the pressing pin 72d passes through the through groove 34f of the spring seat 34 (an example of a second seat member) on the R2 side. Therefore, the rotation of the spring seat 34 on the R1 side of the first window w1 is restricted, but the spring seat 34 on the R2 side can rotate together with the second jig 72.

[0061] In this state, the coil spring 51 and the resin member 52 are set in the first window portion w1. Here, as shown in Fig. 5A, the entire first support portion 301 of the first window portion w1 and the entire first accommodating portion 401 are overlapped when viewed in the axial direction, and the distance L between the support surfaces 34a of the opposing spring seats 34 is the same as the free length Sf of the coil spring 51. Therefore, the coil spring 51 can be easily assembled into the first window portion w1 without being compressed.

[0062] <Setting the coil spring 51 into the second window portion w2> Next, as shown in Figure 5B, the second jig 72 is rotated toward R1 by an angle of 2·θ1. That is, the pressing pin 72d of the second jig 72 directly presses the end face of the coil spring 51 in the first window portion w1, compressing the coil spring 51 while rotating the hub flange 40 toward R1. This causes the entire second support portion 302 of the second window portion w2 and the entire second accommodating portion 402 to overlap when viewed in the axial direction.

[0063] In this state, the spring seat 34, coil spring 51, and resin member 52 are set in the second window w2 as shown in Fig. 5C. Here, as described above, the distance L between the support surfaces 34a of the opposing spring seats 34 is the same as the free length Sf of the coil spring 51, so similarly to the above, the coil spring 51 can be easily assembled into the second window w2 without being compressed.

[0064] <Set to neutral> 5D, the second jig 72 is rotated by an angle θ1 toward the R2 side, whereby the first plate 31 and the hub flange 40 are placed in a neutral position as shown in FIG.

[0065] [Operation] It should be noted that hysteresis torque is omitted in the following description of the operation and in the torsional characteristics shown in FIG.

[0066] <First window portion w1> In a neutral state where the input side plate 30 and the hub flange 40 are not rotating relative to each other, the first support portion 301 and the first accommodating portion 401 are offset from each other in the first window portion w1. First window w1 10B, 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 in FIG.

[0067] When torque fluctuation is input to the damper unit 20 and the input plate 30 twists relative to the hub flange 40 from the neutral state toward the R1 side (i.e., the hub flange 40 twists toward the R2 side) by an offset angle θ1, 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 in FIG. 10B.

[0068] Furthermore, when the input plate 30 twists toward the R1 side relative to the hub flange 40 beyond the offset angle θ1, the distance between the opposing spring seats 34 again becomes smaller than the free length Sf of the coil spring 51. Therefore, when the torsional angle of the input plate 30 relative to the hub flange 40 exceeds the offset angle θ1, the coil spring 51 is compressed from the free length Sf, and the torsional torque gradually increases.

[0069] On the other hand, when the input plate 30 twists from the neutral state toward the R2 side relative to the hub flange 40, the coil spring 51 is always compressed between the opposing spring seats 34. That is, as shown in Fig. 10B, in the negative torsion region, the torsional torque increases toward the negative side as the torsion angle increases.

[0070] <Second window portion w2> 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 w2 In this neutral state, the distance between the opposing spring seats 34 is shorter than the free length Sf of the coil spring. Therefore, in this neutral state, a torsional torque +t is generated by the compressed coil spring 51, as shown in Fig. 10C.

[0071] When the input plate 30 twists from the neutral state toward the R1 side relative to the hub flange 40, the coil spring 51 is always compressed between the opposing spring seats 34. That is, as shown in FIG. 10C, in the positive torsion region, the torsional torque increases as the torsion angle increases.

[0072] On the other hand, when the input plate 30 is twisted by an offset angle θ1 from the neutral state toward the R2 side relative to the hub flange 40, 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, when the torsional angle between the input plate 30 and the hub flange 40 is −θ1, the torsional torque becomes "0," as shown in FIG. 10C.

[0073] Furthermore, when the input plate 30 is twisted toward the R2 side beyond the offset angle θ1 relative to the hub flange 40, the distance between the opposing spring seats 34 again becomes narrower than the free length Sf of the coil spring 51. Therefore, when the torsion angle exceeds −θ1, the coil spring 51 is compressed from the free length Sf, and as shown in FIG. 10C, the torsional torque gradually increases on the negative side.

[0074] <Composite torsional characteristics> The damper unit as a whole combines the characteristics shown in Fig. 10B and the characteristics shown in Fig. 10C to produce the torsional characteristics shown in Fig. 10A. That is, in the neutral state, the torsional torque is "0", and as the torsional angle increases toward the positive and negative sides, the torsional torque also increases toward the positive and negative sides.

[0075] 10A, when the torsion angle becomes ±θ2, the resin member 52 in each window portion w1, w2 is compressed. Therefore, the overall torsion characteristic becomes a two-stage characteristic. When the torsion angle becomes ±θ3, the stopper protrusion 42b of the flange 42 abuts against the stopper portion 31a of the first plate 31, and relative rotation between the input side plate 30 and the hub flange 40 is prohibited.

[0076] [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.

[0077] (a) The shapes of the jigs used when assembling the coil spring are not limited to those described in the above embodiment. For example, a protrusion may be provided on the outer periphery of the hub flange, and the protrusion may be pressed by a jig to compress the hub flange and the coil spring.

[0078] (b) The numbers of the housing portions, support portions, and coil springs are merely examples and are not limited to those in the above-described embodiment. [Explanation of symbols]

[0079] 1 Damper device 30 Input side plate (first rotating body) 301 1st support part 302 Second support part 40 Hub flange (second rotating body) 401 First Storage Unit 402 Second Storage Unit 51 Coil spring (first elastic member, second elastic member) 71 First jig 71b Fixing pin (fixing part) 71c Movement restriction pin 72 Second jig 72d Pressing pin ( Pressing part )

Claims

1. a first rotating body having a first support portion and a second support portion; a second rotor that is rotatable relative to the first rotor and has a first housing portion that is offset in a first rotation direction from the first support portion and a second housing portion that is offset in a second rotation direction from the second support portion; a first elastic member pre-compressed and disposed in the first support portion and the first accommodation portion; a second elastic member pre-compressed and disposed in the second support portion and the second accommodation portion; A method for assembling a damper device comprising: a first step of overlapping a first support portion of the first rotating body and a first accommodation portion of the second rotating body in an axial view so as to eliminate the offset; a second step of arranging the first elastic member in the first support portion and the first accommodating portion that are overlapped with each other; a third step of rotating the second rotor relative to the first rotor in a first rotation direction while compressing the first elastic member, thereby overlapping the second support portion and the second accommodating portion in an axial view so that the offset is eliminated; a fourth step of arranging the second elastic member in the second support portion and the second accommodating portion that are overlapped with each other; a fifth step of rotating the second rotating body relative to the first rotating body in a second rotation direction by an offset angle between the second support portion and the second accommodating portion while compressing the second elastic member; Including, In each of the steps, the first rotating body is fixed to a first jig so as not to be rotatable, the method further includes a step of preparing a second jig that is rotatable around a rotation center of the second rotating body, for rotating the second rotating body in a first rotation direction in the third step and for rotating the second rotating body in a second rotation direction in the fifth step; the first jig has a fixing portion for making an end surface of the first elastic member on a first rotation direction side non-rotatable, the second jig has a pressing portion that is in contact with an end surface of the first elastic member on the second rotation direction side and is capable of compressing the first elastic member, the damper device further includes a first seat member supporting an end face of the first elastic member on a first rotation direction side, and a second seat member supporting an end face of the first elastic member on a second rotation direction side, the fixing portion of the first jig and the pressing portion of the second jig are detachably attachable to the first sheet member and the second sheet member, In the third step and the fifth step, the fixing portion attached to the first sheet member is brought into contact with an end surface of the first elastic member, thereby restricting movement of the end surface of the first elastic member on the first rotation direction side; the pressing portion attached to the second sheet member is brought into contact with an end surface of the first elastic member on the second direction side, thereby actuating the first elastic member. A method for assembling a damper device.

2. The distance between the first sheet member and the second sheet member is the same as the free length of the first elastic member. A method for assembling the damper device according to claim 1.

3. 3. The method for assembling a damper device according to claim 1, wherein an offset angle between the first support portion and the first housing portion is the same as an offset angle between the second support portion and the second housing portion.

4. a first rotating body having a first support portion and a second support portion; a second rotor that is rotatable relative to the first rotor and has a first housing portion that is offset in a first rotation direction from the first support portion and a second housing portion that is offset in a second rotation direction from the second support portion; 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; a pair of sheet members that support both end surfaces of the first elastic member and have assembly holes, into which a jig for controlling the operation of the first elastic member when assembling the first elastic member and the second elastic member can be removably attached; A damper device comprising:

5. 5. The damper device according to claim 4, wherein the assembly hole of the sheet member is formed so that an attached jig can abut against an end face of the first elastic member and press the first elastic member.

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