damping device

Abstract

The present application provides a damping device, inhibits the size in the radial direction, realizes the miniaturization of the device. The damping device (1) has a damping unit (10) and a torque limiter unit (20). The damping unit (20) has: the first and second plates (11, 12) with window parts (11d, 12d); the hub flange (13) with window holes (18a); and the stop mechanism (40). The first plate (11) has the engaging part (11b) and the first fixed part (11c) fixed to the second plate radially outward of the window part (11d), the hub flange (13) has the protrusion (18c) radially outward between the circumferential direction of adjacent window holes (8a). The stop mechanism (40) is constituted by the protrusion (18c) and the engaging part (11b) abutting, the rivet (29) fixing the first plate (11) and the torque limiter unit (20) is arranged between the circumferential direction of adjacent window parts (11d, 12d) when viewed from the direction along the rotation axis.

Description

TECHNICAL FIELD

[0001] The present application relates to a damper device, particularly a damper device provided between a component on a power source side and a component on an output side. BACKGROUND

[0002] For example, in a hybrid vehicle equipped with an engine and a motor, in order to prevent excessive torque from being transmitted from the output side to the engine side at the time of engine start and the like, a damper device shown in Patent Document 1 is used.

[0003] The damper device of Patent Document 1 has a damper portion provided with a pair of plates and a plurality of torsion springs, and a torque limiter is provided on the outer peripheral side of the damper portion. The torque limiter and the damper portion are linked by a rivet. Further, the plate of the torque limiter is fixed to the plate by the rivet.

[0004] Here, the torque transmitted between the damper portion and the flywheel is limited by the torque limiter, and excessive torque is prevented from being transmitted therebetween.

[0005] Patent Document 1: Japanese Patent Application Publication No. 2014-214818 SUMMARY

[0006] The damper device of Patent Document 1 is provided with the torque limiter on the outer peripheral side of the damper portion. More specifically, the damper portion has a pair of first and second circular plate-shaped plates as a rotating body on the input side, and the torque limiter has a connecting plate on which a friction material is fixed on both sides. Further, the inner peripheral portion of the connecting plate is fixed to the outer peripheral portion of the first plate by a rivet.

[0007] In such a conventional damper device, in the case where the torque limiter is provided, the radial dimension becomes large, and the downsizing of the device is hindered.

[0008] The technical problem of the present application is to suppress the radial dimension and achieve the downsizing of the device in a damper device having a torque limiter function.

[0009] (1) The damping device according to the present application is provided between a component on the power source side and a component on the output side. The damping device includes a damping unit and a torque limiter unit. The damping unit is coupled to the component on the output side. The torque limiter unit limits the torque transmitted between the component on the power source side and the damping unit. The damping unit includes a first plate and a second plate, a hub flange, a plurality of elastic members, and a stopper mechanism. The first plate and the second plate are arranged in opposition to each other in the axial direction. The first plate and the second plate each have a plurality of window portions arranged in the circumferential direction. The hub flange is rotatable relative to the first plate and the second plate. The hub flange has a flange portion. The flange portion is arranged between the first plate and the second plate in the axial direction and has a window hole at a position corresponding to the plurality of window portions. The plurality of elastic members elastically couple the first plate and the second plate and the hub flange in the rotational direction. The plurality of elastic members are housed in the plurality of window portions and the window hole. The stopper mechanism limits the relative rotation of the first plate and the second plate and the hub flange to a prescribed angular range. The torque limiter unit includes an annular plate having an inner peripheral portion fixed to an outer peripheral portion of the first plate by a fixing member. The first plate has an engagement portion and a fixing portion. The engagement portion extends toward the second plate side outward in the radial direction of the window portion. The fixing portion extends outward in the radial direction from a leading end of the engagement portion and is fixed to the second plate. The hub flange has a protrusion outward in the radial direction between the circumferential directions of adjacent window holes. The stopper mechanism is configured by the protrusion and the engagement portion abutting each other when the first plate and the second plate are rotated at a prescribed angle relative to the hub flange. The fixing member is arranged between the circumferential directions of adjacent window portions when viewed in the direction along the rotational axis.

[0010] In the device, the torque transmitted between the damping unit and the component on the power source side is limited by the torque limiter unit. Therefore, in the case where the device is mounted on, for example, a hybrid vehicle, it is possible to prevent excessive torque from being transmitted from the output side to the engine side at the time of engine start and the like.

[0011] Here, the annular plate constituting the torque limiter unit is fixed to the first plate of the damping unit between the circumferential directions of adjacent window portions by the fixing member. That is, the inner peripheral portion of the torque limiter unit and the outer peripheral portion of the damping unit are coupled in overlap when viewed in the direction along the rotational axis. Therefore, in the device, it is possible to suppress the radial dimension compared to the conventional damping device.

[0012] (2) Preferably, the second plate and the flange have an assembly hole through which the fixing member can pass in the axial direction.

[0013] (3) Preferably, the torque limiter unit has a first clamping plate and a second clamping plate and a force applying member. The first clamping plate and the second clamping plate are arranged so as to sandwich the annular plate. The first clamping plate and the second clamping plate are fixed so as not to be axially movable relative to each other. The force applying member is arranged so as to be sandwiched between the first clamping plate and the second clamping plate together with the annular plate. The force applying member applies a force to the friction plate.

[0014] (4) Preferably, the first clamping plate and the second clamping plate partially overlap the fixing portion as viewed in the direction of the rotation axis.

[0015] In the above-described damping device according to the present application, the radial dimension can be suppressed, and the device can be downsized. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a cross-sectional view of a damping device according to an embodiment of the present application.

[0017] Figure 2 is a front view of the damping device of Figure 1

[0018] Figure 3 is a drawing showing a torque limiter unit of the damping device of Figure 1

[0019] Figure 4 is a partial front view of the torque limiter unit.

[0020] REFERENCE NUMERALS

[0021] 1: damping device; 10: damping unit; 11: first plate; 11b: engaging portion; 11c: first fixing portion; 11d: first window portion; 12: second plate; 12c: second fixing portion; 12b: assembly hole; 12d: second window portion; 13: hub flange; 14: torsion spring (example of elastic member); 18: flange; 18a: window hole; 21: first clamping plate; 22: second clamping plate; 23: friction disc; 24: pressure plate; 25: conical spring (example of force applying member); 27b: fifth fixing portion; 40: stopper mechanism. DETAILED DESCRIPTION

[0022] [Overall Configuration]

[0023] Figure 1 is a cross-sectional view of a damping device 1 according to an embodiment of the present application (hereinafter, there are cases where only "damping device 1" is described). In addition, Figure 2 is a front view of the damping device 1, a part of which is shown with components constituting the damping device 1 removed. In Figure 1 in the damping device 1, an engine is disposed on the left side, and a drive unit including a motor, a transmission device, and the like is disposed on the right side.

[0024] The damping device 1 is a device provided between a flywheel and an input shaft of the drive unit (neither of which is shown) and used to limit the torque transmitted between the engine and the drive unit while attenuating rotational fluctuations. The damping device 1 has a damping unit 10 and a torque limiter unit 20. ​​

[0025] [Damping Unit 10]

[0026] like Figure 1 As shown, the damping unit 10 has a first plate 11 and a second plate 12, a hub flange 13, a plurality of torsion springs 14 (an example of an elastic component), a stop mechanism 40, and a hysteresis generating mechanism 15.

[0027] <First Board 11>

[0028] As described later, the first plate 11 is connected to components constituting the torque limiter unit 20. The first plate 11 has a main body 11a formed in the shape of a circular plate, multiple engaging portions 11b, and a first fixing portion 11c. On the outer periphery of the main body 11a, multiple first windows 11d are arranged circumferentially. Each first window 11d has an axially penetrating hole and retaining portions formed on the outer and inner periphery of the hole. The engaging portions 11b are formed by protruding a portion of the outer periphery of the first plate 11 radially outward and then bending that portion toward the second plate 12. The first fixing portion 11c is formed by further bending the front end of the engaging portion 11b radially outward. Additionally, multiple rivet holes 11e for mounting the torque limiter unit 20 are formed on the outer periphery of the first plate 11.

[0029] <Second Board 12>

[0030] The second plate 12 is axially spaced from the first plate 11 and arranged opposite to it. The second plate 12 is formed as a circular plate with a straight portion on a part of its outer peripheral surface. Furthermore, the outermost diameter of the second plate 12 is the same as the outer diameter of the first plate 11. On the outer periphery of the second plate 12, a plurality of second windows 12d are formed opposite to the first window 11d of the first plate 11. Each second window 12d has an axially penetrating hole and retaining portions formed on the outer and inner periphery edges of the hole. In the second plate 12, a second fixing portion 12c is formed on the outer periphery between the second windows 12d in the circumferential direction. The first fixing portion 11c of the first plate 11 and the second fixing portion 12c of the second plate 12 are fixed together by rivets 16. Therefore, the first plate 11 and the second plate 12 cannot move relative to each other in the axial and rotational directions.

[0031] In addition, a plurality of assembly holes 12b are formed in the outer periphery of the second plate 12 at positions corresponding to the rivet holes 11e of the first plate 11.

[0032] <Hub flange 13>

[0033] The hub flange 13 has a cylindrical hub 17 formed at the center portion, and a flange 18 extending radially outward from the outer peripheral surface of the hub 17. A spline hole 17a is formed on the inner peripheral surface of the hub 17, and an input shaft of a drive unit can be spline-fitted to the spline hole 17a. The flange 18 is formed in a circular plate shape, and is disposed between the axial directions of the first plate 11 and the second plate 12. The flange 18 has a plurality of window holes 18a. Each window hole 18a is formed at a position corresponding to the first window portion 11d of the first plate 11 and the second window portion 12d of the second plate 12.

[0034] A plurality of protrusions 18c protruding radially outward are formed on the outer peripheral surface of the flange 18. The protrusions 18c are disposed radially outward between the circumferential directions of adjacent window holes 18a. The circumferential direction end surface of the engagement portion 11b of the first plate 11 can abut against the circumferential direction end surface of the protrusions 18c.

[0035] In addition, a plurality of assembly work holes 13b are formed in the outer peripheral portion of the hub flange 13 at positions corresponding to the rivet holes 11e of the first plate 11.

[0036] < torsion spring 14 >

[0037] A plurality of torsion springs 14 are housed in the window holes 18a of the hub flange 13, and are held in the axial and radial directions by the first window portion 11d of the first plate 11 and the second window portion 12d of the second plate 12. In addition, the circumferential direction end surfaces of the torsion springs 14 can abut against the circumferential direction end surfaces of the first window portion 11d, the second window portion 12d, and the window holes 18a, respectively.

[0038] < stop mechanism >

[0039] The stop mechanism 40 limits the relative rotation of the first plate 11 and the second plate 12 with respect to the hub flange 13 to a prescribed angular range. The stop mechanism 40 is constituted by the engagement portion 11b of the first plate 11 and the protrusions 18c of the flange 18. In detail, the stop mechanism 40 is constituted by the circumferential direction end surfaces of the protrusions 18c of the hub flange 13 and the engagement portion 11b abutting against each other when the first plate 11 and the second plate 12 are rotated at a prescribed angle with respect to the hub flange 13. The protrusions 18c are disposed radially outward between the circumferential directions of adjacent window holes 18a, and thus the strength of the components is higher than when the protrusions 18c are disposed radially outward of the window holes 18a.

[0040] < hysteresis generation mechanism 15 >

[0041] The hysteresis generation mechanism 15 has a first bush 31, a second bush 32, and a conical spring 33.

[0042] The first bushing 31 is disposed axially between the inner periphery of the first plate 11 and the inner periphery of the flange 18 of the hub flange 13. The first bushing 31 has a plurality of engaging protrusions 31a protruding axially, which engage with holes 11f formed in the first plate 11. Therefore, the first bushing 31 cannot rotate relative to the first plate 11.

[0043] The second bushing 32 is disposed axially between the inner periphery of the second plate 12 and the inner periphery of the flange 18 of the hub flange 13. The second bushing 32 has a plurality of engaging protrusions 32a protruding axially, which engage with holes 12e formed in the second plate 12. Therefore, the second bushing 32 cannot rotate relative to the second plate 12.

[0044] A conical spring 33 is disposed axially between the first plate 11 and the first bushing 31. The conical spring 33 presses the first bushing 31 against the flange 18, and presses the second bushing 32 against the flange 18 via the second plate 12 fixed to the first plate 11 and the first plate 11.

[0045] In such a hysteresis generating mechanism 15, when the first and second plates 11, 12 and the hub flange 13 rotate relative to each other, frictional resistance (hysteresis torque) is generated between the first bushing 31 and the flange 18, and frictional resistance is also generated between the second bushing 32 and the flange 18.

[0046] [Torque Limiter Unit 20]

[0047] A torque limiter unit 20 is disposed on the outer periphery of the damping unit 10. The torque limiter unit 20 limits the torque transmitted between the flywheel and the damping unit 10. Figure 3 As shown, the torque limiter unit 20 includes a first clamping plate 21 and a second clamping plate 22, a friction disc 23, a pressure plate 24, and a conical spring 25 (an example of a force-applying component). Furthermore, Figure 3 It is to extract Figure 1 The figure shows a portion of the torque limiter unit 20.

[0048] <First clamping plate 21 and second clamping plate 22>

[0049] The first clamping plate 21 has an annular friction portion 21a and a third fixing portion 21b. The outer periphery of the friction portion 21a is offset towards the second clamping plate 22 and axially to form the third fixing portion 21b. The second clamping plate 22 has an annular support portion 22a and a fourth fixing portion 22b. The outer periphery of the support portion 22a is offset towards the first clamping plate 21 and axially to form the fourth fixing portion 22b. Furthermore, the third fixing portion 21b of the first clamping plate 21 and the fourth fixing portion 22b of the second clamping plate 22 are connected by a plurality of rivets 26 (see reference). Figure 1) are fixed to each other. The first clamping plate 21 and the second clamping plate 22 partially overlap the first fixing portion 11c as viewed in the direction of the rotation axis. The first clamping plate 21 and the second clamping plate 22 are fixed so as not to be axially movable with respect to each other.

[0050] Further, in the third fixing portion 21b and the fourth fixing portion 22b of the first clamping plate 21 and the second clamping plate 22, a plurality of holes 21c, 22c (refer to Figure 1 ) for fixing the torque limiter unit 20 to the flywheel are formed.

[0051] <Friction plate 23>

[0052] As shown in Figure 3 , the friction plate 23 has a ring-shaped plate 27 and a pair of friction members 28 fixed to both side surfaces of the ring-shaped plate 27 by rivets. As shown in Figure 3 and Figure 4 , the ring-shaped plate 27 has a main body portion 27a formed in a substantially ring shape and a plurality of fifth fixing portions 27b. Figure 4 is a front view of the main body portion 27a of the torque limiter unit 20. The fifth fixing portions 27b protrude from the inner peripheral end of the main body portion 27a toward the radially inner side and are formed at equal angles in the circumferential direction. A linking hole 27c is formed in the fifth fixing portion 27b. The ring-shaped plate 27 is fixed to the outer peripheral portion of the first plate 11 by a rivet 29 (an example of a fixing member; refer to Figure 1 ) passing through the linking hole 27c and the rivet hole 11e of the first plate 11. The flywheel-side friction member of the pair of friction members 28 abuts against the friction portion 21a of the first clamping plate 21.

[0053] <Press plate 24 and conical spring 25>

[0054] The press plate 24 and the conical spring 25 are disposed between the friction plate 23 and the support portion 22a of the second clamping plate 22.

[0055] The press plate 24 is formed in a ring shape and sandwiches the friction members 28 of the friction plate 23 between the friction portion 21a of the first clamping plate 21. As shown in Figure 1 , a plurality of claws 24a are formed in the outer peripheral portion of the press plate 24, and the claws 24a are engaged with the plurality of engagement holes 22d formed in the second clamping plate 22.

[0056] The conical spring 25 is disposed between the press plate 24 and the support portion 22a of the second clamping plate 22. The conical spring 25 presses the friction plate 23 to the friction portion 21a of the first clamping plate 21 via the press plate 24.

[0057] <Positional relationship between the damper unit 10 and the torque limiter unit 20>

[0058] As shown in Figure 1 andFigure 2 As shown in FIG. 1, the fifth fixed portion 27b of the friction plate 23 is located radially inward of the first fixed portion 11c and the second fixed portion 12c of the first and second plates 11, 12. In addition, the fifth fixed portion 27b is arranged, as viewed from the front, between adjacent first window portions 11d in the circumferential direction. Furthermore, a portion of the fifth fixed portion 27b coincides in the radial direction with the first window portion 11d. In addition, the inner diameter of the torque limiter unit 20 (the inner diameter of the first clamping plate 21) is smaller than the outer diameter of the first and second plates 11, 12 of the damper unit 10. That is, the damper unit 10 and the torque limiter unit 20 are arranged in a state of overlapping in the radial direction as viewed in the direction of the rotation axis. The rivet 29 that fixes the annular plate 27 to the outer peripheral portion of the first plate 11 is arranged, as viewed in the direction of the rotation axis, between adjacent first window portions 11d and second window portions 12d in the circumferential direction.

[0059] [Operation]

[0060] The power transmitted from the engine to the flywheel is input to the damper unit 10 via the torque limiter unit 20. In the damper unit 10, the power is input to the first and second plates 11, 12 of the friction plate 23 on which the torque limiter unit 20 is fixed, and the power is transmitted to the hub flange 13 via the torsion spring 14. Furthermore, the power is transmitted from the hub flange 13 to the output-side motor, generator, transmission, and the like.

[0061] In addition, for example, at the time of engine start, the inertia amount of the output side is large, and thus there is a case where excessive torque is transmitted from the output side to the engine. In such a case, the torque transmitted to the engine side by the torque limiter unit 20 is limited to a prescribed value or less.

[0062] In the damper unit 10, when the power is transmitted from the first and second plates 11, 12 to the torsion spring 14, the torsion spring 14 is compressed. In addition, the torsion spring 14 is repeatedly stretched and compressed by torque variation. When the torsion spring 14 is stretched and compressed, a twist is generated between the first and second plates 11, 12 and the hub flange 13. By this twist, the hysteresis generation mechanism 15 operates, and a hysteresis torque is generated. Thus, the torque variation is attenuated.

[0063] When the torque variation is large and the relative rotation angle of the first and second plates 11, 12 and the hub flange 13 is large, the circumferential direction end surface of the engagement portion 11b of the first plate 11 and the protrusion 18c of the flange 18 approach and abut against each other. Thus, the relative rotation of the first and second plates 11, 12 and the hub flange 13 is prohibited.

[0064] [Combination]

[0065] In the torque limiter unit 20, the friction plate 23, the pressure plate 24, and the coned disc spring 25 are sandwiched between the first and second sandwiching plates 21, 22, and can be subunitized. Also, the damping unit 10 can likewise be preassembled in other processes.

[0066] Also, in the case of mounting the torque limiter unit 20 to the damping unit 10, the linking hole 27c of the fifth fixed portion 27b of the friction plate 23 and the rivet hole 11e of the first plate 11 can be positionally aligned, and the both can be fixed by riveting through the assembly work hole 12b of the second plate 12.

[0067] [Other Embodiments]

[0068] The present application is not limited to the above-described embodiments, and various modifications or changes can be made without departing from the scope of the present application.

[0069] (a) The specific configurations of the damping unit 10 and the torque limiter unit 20 are not limited to the above-described embodiments.

[0070] (b) The protrusion 18c can also be disposed on the diameter between the circumferential directions of the adjacent window holes 18a.

Claims

1. A damping device provided between a member on a power source side and a member on an output side, wherein, The damping device includes: a damping unit coupled to the output-side member; and a torque limiter unit that limits torque transmitted between the power source-side member and the damping unit, the damping unit includes: a first plate and a second plate disposed opposite each other in an axial direction and each having a plurality of window portions arranged in a circumferential direction; a hub flange rotatable relative to the first plate and the second plate and having a flange disposed between the first plate and the second plate in the axial direction and having a window hole at a position corresponding to the plurality of window portions; a plurality of elastic members elastically coupling the first plate and the second plate and the hub flange in a rotational direction and accommodated in the plurality of window portions and the window hole; and a stop mechanism that limits relative rotation of the first plate and the second plate and the hub flange to a predetermined angular range, the torque limiter unit includes an annular plate in which an inner peripheral portion is fixed to an outer peripheral portion of the first plate by a fixing member, the first plate includes: an engagement portion extending toward the second plate side radially outward of the window portion; and a fixing portion extending radially outward from a tip end of the engagement portion extending toward the second plate side and fixed to the second plate, the hub flange has a protrusion radially outward between the circumferential directions of adjacent window holes, the stop mechanism is configured by the protrusion and the engagement portion abutting each other when the first plate and the second plate are rotated relative to the hub flange by a predetermined angle, the fixing member is disposed between the circumferential directions of adjacent window portions when viewed in a direction along an axis of rotation, the torque limiter unit includes: a first clamping plate and a second clamping plate disposed so as to sandwich the annular plate and fixed so as to be unable to move axially relative to each other; and a biasing member disposed so as to be sandwiched between the first clamping plate and the second clamping plate together with the annular plate and biasing the friction plate, the first clamping plate and the second clamping plate partially coincide with the fixing portion when viewed in a direction along an axis of rotation.

2. The damping device according to claim 1, wherein the second plate and the flange have an assembly hole through which the fixing member is able to pass in the axial direction. ​

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