Torsional vibration damper

Abstract

The present application relates to a torsional vibration damper. The torsional vibration damper is provided with a mass damper that reduces pulsation of a torque by a moment of inertia of an inertial body, and a spring damper that reduces pulsation of a torque transmitted between an input-side rotating member and an output-side rotating member by compression of an elastic body, which are arranged side by side in a prescribed axial direction, wherein the torsional vibration damper is provided with a bolt that is inserted from the input-side rotating member side to fix the inertial body and the input-side rotating member in the prescribed axial direction, and the input-side rotating member is provided with a housing portion that is recessed toward the mass damper side to house at least a portion of the height direction of a bolt head.

Description

Technical Field

[0001] The present invention relates to a torsional vibration damping device comprising: a mass damper for reducing torque pulsation by means of the moment of inertia of an inertial body; and a spring damper for reducing torque pulsation by means of connecting two plates in the rotational direction via an elastic body. Background Technology

[0002] Japanese Patent Application Publication No. 2009-292477 discloses a torsional vibration damping device comprising a mass damper and a spring damper. In this torsional vibration damping device, a spring damper is connected to a first annular rotating member connected to an engine via a torque limiter, and an annular inertial body functioning as a mass damper is connected to a second rotating member, which is the output side of the spring damper. The torque limiter consists of a plate that rotates integrally with the first rotating member, an intermediate member that rubs against one side of the plate, a disc spring that presses the plate towards the intermediate member, and an annular plate disposed on the opposite side of the plate and bolted to the first rotating member, separated from the plate by the disc spring. Furthermore, the first and second rotating members are arranged side-by-side in the axial direction, and an inertial body is bolted to the side of the second rotating member facing the opposite side of the first rotating member.

[0003] Japanese Patent Application Publication No. 7-224892 or 7-224897 discloses a vibration damping device comprising a flexible plate connected to an engine, a ring member abutting against the side of the flexible plate, a hub flange rotating integrally with the output shaft, a damping section elastically connecting the ring member and the hub flange in the circumferential direction and damping torsional vibration between the two components, and an inertial member integrated with the hub flange. The flexible plate, damping section, and inertial member are arranged side-by-side in the axial direction. An arc-shaped inertial member is fixed to the side of the flexible plate facing the opposite side to the damping section by rivets. Furthermore, the flexible plate and the ring member are fixed by bolts inserted from the side of the flexible plate, and a notch corresponding to the bolt head is formed in the inertial member. It should be noted that the inertial member integrated with the hub flange described in Japanese Patent Application Publication No. 7-224896 functions as an input member of a clutch mechanism.

[0004] In the vibration damping device described in Japanese Patent Application Publication No. 2009-292477, a first rotating member, a spring damper, and an inertial body are arranged side-by-side in the direction of the rotation center axis. Furthermore, a second rotating member, which is the rotating member on the output side of the spring damper, and the inertial body are fixed by bolts inserted from the inertial body side, with the bolt heads protruding from the inertial body. That is, the length of the vibration damping device in the axial direction is a length corresponding to the thickness of the first rotating member, the spring damper, the inertial body, and the amount of bolt head protrusion, allowing for improvement in shortening this axial length.

[0005] Furthermore, the axial length of the vibration damping device described in Japanese Patent Application Publication No. 7-224892 or 7-224897 is a length corresponding to the thickness of the inertial body, flexible plate, damping section, and inertial member integrated with the hub flange. That is, an inertial body is provided to increase the moment of inertia on the input side of the damping section, thereby lengthening the axial length of the vibration damping device, allowing for improvement in shortening the axial length of the vibration damping device. Summary of the Invention

[0006] The present invention was made in view of the above-mentioned technical problems, and its purpose is to provide a vibration damping device that can shorten the length in the axial direction.

[0007] To achieve the above objectives, the present invention provides a torsional vibration damping device in which a mass damper and a spring damper are arranged side-by-side in a predetermined axial direction. The mass damper is configured to reduce torque pulsation by means of the moment of inertia of the inertial body. The spring damper includes an elastic body that is compressed by relative rotation of an input-side rotating member and an output-side rotating member, and the spring damper is configured to reduce torque pulsation transmitted between the input-side rotating member and the output-side rotating member by means of compression of the elastic body. The torsional vibration damping device includes a bolt inserted from the input-side rotating member side to fix the inertial body and the input-side rotating member in the predetermined axial direction. The input-side rotating member has a receiving portion that is recessed toward the mass damper side to receive at least a portion of the bolt head in the height direction.

[0008] Furthermore, in this invention, the depth of the receiving portion may be formed to be less than or equal to the height of the bolt head.

[0009] Furthermore, in this invention, the torsional vibration damping device may be configured such that the end of the spring damper is located closer to the mass damper side than the top of the bolt head in the predetermined axial direction, and the end of the spring damper is located closer to the mass damper side than the end of the receiving portion in the predetermined axial direction.

[0010] Furthermore, in this invention, the torsional vibration damping device may also include a torque limiter that limits the torque transmitted between the mass damper and the spring damper. The torque limiter includes two plates stacked and integrated in a predetermined axial direction. The two plates are stacked on the mass damper in the predetermined axial direction. The input-side rotating member includes an outer plate on the opposite side of the mass damper, which is stacked on the inner plate that contacts the mass damper. The receiving portion includes a through hole penetrating the outer plate.

[0011] Furthermore, in this invention, the input-side rotating member may be formed such that the portion having the receiving portion has a thicker plate than the other portions.

[0012] Furthermore, in this invention, the input-side rotating member may also include: a drive-side rotating member that transmits torque to the spring damper; and an inertial member that is integrated with the drive-side rotating member in the predetermined axial direction, with the receiving portion formed in the inertial member.

[0013] According to the present invention, a mass damper and a spring damper are arranged side by side in a predetermined axial direction, and a bolt is inserted from the input-side rotating member side of the spring damper to fix the inertial body and the input-side rotating member. Therefore, it is possible to prevent the bolt head from protruding from the inertial body side. That is, it is possible to prevent the axial length of the torsional vibration damping device from increasing due to the bolt head protruding from the inertial body. Furthermore, a receiving portion is formed in the input-side rotating member, which is recessed towards the mass damper side to receive at least a portion of the bolt head. Therefore, it is possible to reduce the amount of bolt head protruding from the input-side rotating member, and to prevent the axial length of the torsional vibration damping device from increasing. Attached Figure Description

[0014] Hereinafter, with reference to the accompanying drawings, the features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described, wherein the same reference numerals denote the same elements, wherein:

[0015] Figure 1 This is a front view of the torsional vibration damping device according to an embodiment of the present invention.

[0016] Figure 2 It is along Figure 1 A sectional view along line II-II in the diagram.

[0017] Figure 3 yes Figure 2 An enlarged view of section III.

[0018] Figure 4 This is a cross-sectional view showing an example of a cover plate having a through hole for inserting a bolt head. Detailed Implementation

[0019] exist Figure 1 The diagram shows a front view illustrating an example of a torsional vibration damping device according to an embodiment of the present invention. Figure 2 The middle shows along Figure 1 The sectional view along line II-II, and in Figure 3 The middle shows Figure 2 An enlarged view of section III.

[0020] like Figure 1 and Figure 2 As shown, the torsional vibration damping device 1 consists of a mass damper 2 that reduces torque pulsation (torsional vibration) through the moment of inertia of an inertial body and a spring damper 3 that reduces torque pulsation (torsional vibration) through the compression of an elastic body. The mass damper 2 and the spring damper 3 are arranged side by side in the direction of the rotation center axis C of the crankshaft 5, which will be described later.

[0021] like Figure 2 As shown, the mass damper 2 is composed of a flywheel 4 formed in a ring shape. That is, the flywheel 4 functions as an inertial body.

[0022] A crankshaft 5 (not shown) of an engine abuts against the inner circumference of the flywheel 4. The crankshaft 5 and the flywheel 4 are integrated by bolts 6 inserted from the side opposite to the engine. Furthermore, the outer circumference of the flywheel 4 is thicker than the inner circumference and protrudes towards the side opposite to the engine. By increasing the thickness of the outer circumference of the flywheel 4, the mass of the flywheel 4 increases, and the moment of inertia of the flywheel 4 also increases. That is, the torsional vibration reduction effect of the mass damper 2 is improved.

[0023] The flywheel 4 is provided with a torque limiter 7 for limiting the torque transmitted between the flywheel 4 and the spring damper 3. The torque limiter 7 can be constructed in the same way as conventional torque limiters, consisting of a friction engagement mechanism that limits the transmitted torque by the relative rotation of the input-side rotating member and the output-side rotating member when a torque exceeding a predetermined specified torque is applied.

[0024] like Figure 2 and Figure 3 As shown, the torque limiter 7 consists of a support plate 8 and a cover plate 9 integrated with the flywheel 4, a pressure plate 10 disposed opposite to the cover plate 9, a disc spring 11 that presses the pressure plate 10 toward the cover plate 9, and a drive-side rotating member 12 disposed between the pressure plate 10 and the cover plate 9. The support plate 8 and the cover plate 9 are equivalent to the "two plates" in the embodiment of the present invention, and the cover plate 9 is equivalent to the "outer plate" in the embodiment of the present invention.

[0025] The aforementioned support plate 8 is formed by pressure processing, etc., and its outer peripheral side contacts the outer peripheral end face of the flywheel 4. The portion of the support plate 8 that is closer to the inner peripheral side than the portion that contacts the flywheel 4 is formed to be bent toward the flywheel 4. That is, the support plate 8 is formed by bending such that the edge of the inner peripheral side of the support plate 8 is located inside the outer peripheral portion of the flywheel 4.

[0026] The cover plate 9 corresponds to the "input-side rotating member" in the embodiment of the present invention, and is disposed on the side opposite to the flywheel 4, separated by the support plate 8. That is, the cover plate 9 and the support plate 8 are stacked in the direction of the rotation center axis C of the crankshaft 5, and these cover plates 9 and support plates 8 are stacked on the flywheel 4, which functions as a mass damper 2.

[0027] The cover plate 9 can also be formed by pressure processing in the same way as the support plate 8, with its outer peripheral side being thicker than its inner peripheral side. Specifically, the side opposite to the flywheel 4 is formed as a smooth surface, and the outer peripheral side of the cover plate 9 is made thicker, so that the outer peripheral portion of the side on the flywheel 4 side protrudes towards the flywheel 4 side more than the inner peripheral portion. In other words, the outer peripheral portion bends towards the flywheel 4 side, and through this bending, the outer peripheral portion is recessed towards the flywheel 4 side compared to the inner peripheral portion, and a wall thickness portion is formed in this recessed portion to accommodate the bolt head 13a and increase the plate thickness. It should be noted that the inner diameter of the cover plate 9 is formed to be smaller than the inner diameter of the support plate 8.

[0028] The outer peripheral portion is fixed to the flywheel 4 from the cover plate 9 by bolts 13. For example... Figure 3 As shown, a recess 14 is formed on the outer periphery of the cover plate 9 to accommodate at least a portion of the bolt head 13a. That is, the recess 14 is formed with an opening diameter larger than the diameter of the bolt head 13a. In other words, the plate thickness other than the recess 14 accommodating the bolt head 13a is made thicker according to the height of the bolt head 13a. The depth of the recess 14 is preferably greater than the height of the bolt head 13a, but... Figure 3 As shown, it is sufficient to accommodate at least a portion of the bolt head 13a. This recess 14 corresponds to the "accommodating portion" in the embodiment of the present invention.

[0029] It should be noted that, as Figure 1 As shown, the support plate 8 and the cover plate 9 are fixed by rivets 15 at predetermined intervals in the circumferential direction. In order to perform engine inspection at the factory, through holes 16 are formed at predetermined intervals in the circumferential direction, which pass through the cover plate 9, the support plate 8 and the flywheel 4.

[0030] As described above, the inner circumferential portion of the support plate 8 is bent toward the flywheel 4, and the outer circumferential portion of the cover plate 9 is made thicker by protruding toward the flywheel 4. In other words, the outer circumferential portion of the side of the cover plate 9 facing the support plate 8 is formed to be bent toward the support plate 8. Therefore, the inner circumferential portions of the support plate 8 and the cover plate 9 are separated in the direction of the rotation center axis C.

[0031] A pressure plate 10 is disposed opposite to the inner circumferential side of the cover plate 9. A disc spring 11 is disposed between the support plate 8 and the pressure plate 10 to press the pressure plate 10. That is, the disc spring 11 presses the pressure plate 10 toward the cover plate 9. A drive-side rotating member 12 for transmitting torque to the spring damper 3 is sandwiched between the pressure plate 10 and the cover plate 9. It should be noted that friction members 17 for increasing the friction with the pressure plate 10 and the cover plate 9 are assembled on both sides of the drive-side rotating member 12.

[0032] Therefore, by pressing the pressure plate 10 with the disc spring 11, the driving side rotating member 12 is clamped between the pressure plate 10 and the cover plate 9, generating a frictional force corresponding to the clamping force and the coefficient of friction between the pressure plate 10, the cover plate 9 and the driving side rotating member 12 (specifically the friction member 17), and transmitting torque between the cover plate 9 and the driving side rotating member 12 with the torque based on the frictional force as the upper limit.

[0033] A spring damper 3 is connected to the aforementioned drive-side rotating member 12. This spring damper 3, like conventional spring dampers, is configured to attenuate and output the pulsation (torsional vibration) of the input torque. Figure 2 The spring damper 3 shown includes: a driving-side rotating member 12; and a driven-side rotating member 18, which is arranged on a concentric circle with the driving-side rotating member 12 and can rotate relative to it.

[0034] A pair of annular drive plates 19 are connected to both sides of the drive-side rotating member 12 by rivets 20. Each drive plate 19 has a window opening 21 of a predetermined length in the circumferential direction, and a helical spring 22, which is telescopically arranged in the circumferential direction, is accommodated in the window opening 21. This helical spring 22 corresponds to the "elastic body" in embodiments of the present invention. It should be noted that the pair of drive plates 19 are formed to be separated from each other from the outer peripheral side toward the window opening 21, with the edges of the window opening 21 being separated from each other by a distance approximately the same as the outer diameter of the helical spring 22.

[0035] Furthermore, the driven-side rotating member 18 is composed of a hollow shaft 24 that spline-engages with the drive shaft 23, which serves as the output member of the torsional vibration damping device 1, and a flange 25 that protrudes outward from the outer periphery of the hollow shaft 24 toward the annular gap formed between the aforementioned pair of drive plates 19. This flange 25 is configured to compress a helical spring 22 between the wall surfaces in the circumferential direction of the window opening 21 when the driven-side rotating member 12 and the driven-side rotating member 18 rotate relative to each other.

[0036] Therefore, it is configured such that the helical spring 22 is compressed by the relative rotation of the driving-side rotating member 12 and the driven-side rotating member 18, and the compression amount is used to absorb and attenuate the torque pulsation transmitted between the driving-side rotating member 12 and the driven-side rotating member 18. It should be noted that a friction engagement device 26 is provided in the gap between the inner periphery of the pair of driving plates 19 and the inner periphery of the flange portion 25 in the direction of the rotation center axis C, which transmits torque by stacking and clamping multiple plates and friction elements.

[0037] By fixing the cover plate 9 and the flywheel 4 with bolts 13 inserted from the spring damper 3 side as described above, the protrusion of the bolt head 13a towards the flywheel 4 side can be suppressed. That is, the length of the rotation center axis C of the torsional vibration damping device 1 due to the bolt head 13a protruding from the flywheel 4 can be suppressed. Furthermore, by forming a recess 14 for accommodating the bolt head 13a in the cover plate 9, the amount of protrusion of the bolt head 13a can be reduced. More specifically, as... Figure 2 As shown, the rotation center axis C of the torsional vibration damping device 1 is directed towards the output side ( Figure 2 The most prominent component (on the right side) becomes the drive plate 19 or the coil spring 22, which can prevent the bolt head 13a from protruding beyond the drive plate 19 or the coil spring 22 in the direction of the rotation center axis C. In other words, by forming a recess 14 to accommodate the bolt head 13a, the thickness of the cover plate 9 can be made thicker. The cover plate 9 rotates integrally with the flywheel 4 and functions as an inertial body of the mass damper 2. Therefore, by making the cover plate 9 thicker, the mass of the inertial body can be increased, and the moment of inertia can be increased. Moreover, the mass of the outer periphery of the cover plate 9 can be increased, thus further improving the vibration damping effect for the increase in mass.

[0038] It should be noted that, not limited to making the thickness of the outer periphery of the cover plate 9 thicker than that of the inner periphery as described above, the cover plate 9 can also be made with a fixed thickness, and its outer periphery can be bent toward the flywheel 4. Other plates that serve as inertial components can be integrated with the side of the outer periphery by welding, bonding or riveting, thereby adding an inertial body with a recess for accommodating the bolt head 13a.

[0039] In addition, such as Figure 2As shown, the cover plate 9 and the support plate 8 are integrated by rivets 15. This is so that after the torque limiter 7 and the spring damper 3 are modularized, the modularized torque limiter 7 and the spring damper 3 can be assembled onto the flywheel 4. Therefore, it is also possible to simply bolt the support plate 8 to the flywheel 4. Specifically, it is also possible to... Figure 4 As shown, a through hole 27 larger than the outer diameter of the bolt head 13a is formed in the cover plate 9, and the support plate 8 is fixed to the flywheel 4 in such a way that the bolt head 13a contacts the side of the support plate 8.

[0040] By forming a through hole 27 in the cover plate 9, the amount of protrusion of the bolt head 13a can be reduced, and the thickness of the flywheel 4 can be increased accordingly. This can suppress the length of the rotation center axis C of the torsional vibration damping device 1 and improve the vibration damping effect of the mass damper 2.

[0041] It should be noted that, in embodiments of the present invention, the receiving portion only needs to be configured to accommodate at least a portion of the bolt head 13a, and the depth of the receiving portion can be determined with the height of the bolt head 13a as the upper limit. By determining the depth of the receiving portion with the height of the bolt head 13a as the upper limit, for example, a secondary shaft can be arranged parallel to the drive shaft 23, suppressing interference with components such as gears mounted on the secondary shaft that are arranged side by side with the outer periphery of the torsional vibration damping device 1 in the axial direction, thereby shortening the axial length of the entire device including the torsional vibration damping device 1.

[0042] Furthermore, the depth of the receiving portion can also be greater than the height of the bolt head 13a. That is, the position of the opening end of the receiving portion only needs to be more recessed than the end of the most protruding member in the direction of the rotation center axis C of the torsional vibration damping device 1. Specifically, it can be, for example... Figure 2 As shown, when the spring damper 3 protrudes most prominently in the direction of the rotation center axis C, the thickness of the cover plate 9 is increased to the end of the component constituting the spring damper 3 in the direction of the rotation center axis C of the torsional vibration damping device 1, and a receiving portion such as a recess 14 is formed in the cover plate 9.

[0043] Furthermore, when the bolt head 13a protrudes most prominently in the direction of the rotation center axis C of the torsional vibration damping device 1, the thickness of the cover plate 9 can be increased to the end of the bolt head 13a, forming a receiving portion such as a recess 14 in the cover plate 9. That is, it can also be configured such that when the end of the spring damper 3 is located closer to the mass damper 2 than the top of the bolt head 13a in the direction of the rotation center axis C of the torsional vibration damping device 1, the end of the spring damper 3 is located closer to the mass damper 2 than the end of the recess 14.

[0044] Alternatively, the outer periphery of the cover plate 9 can be uniformly thickened in the circumferential direction, or it can be partially thickened. Or, when other plates that serve as inertial components are integrated with the cover plate 9 by welding, bonding, or riveting as described above, for example, three arc-shaped plates can be assembled side by side in the circumferential direction, and multiple plates can be assembled onto the cover plate 9.

[0045] Furthermore, the torsional vibration damping device according to the embodiments of the present invention may also be without a torque limiter between the mass damper and the spring damper. In the case of such a torsional vibration damping device without a torque limiter, it is sufficient to simply bolt the drive-side rotating member 12, which serves as the input-side rotating member of the spring damper, to the mass damper, and form a receiving portion such as a recess for accommodating the bolt head on the plate.

Claims

1. A torsional vibration damping device comprising, arranged side-by-side along a predetermined axial direction: a mass damper for reducing torque pulsation by means of the moment of inertia of an inertial body; and a spring damper comprising an elastic body compressed by relative rotation of an input-side rotating member and an output-side rotating member, wherein the compression of the elastic body reduces torque pulsation transmitted between the input-side rotating member and the output-side rotating member, wherein... The torsional vibration damping device includes: Bolts are inserted from the input-side rotating member side to fix the inertial body and the input-side rotating member in the specified axial direction. The input-side rotating member has a receiving portion that is recessed toward the mass damper side to receive at least a portion of the bolt head in the height direction. The torsional vibration damping device also includes a torque limiter, which limits the torque transmitted between the mass damper and the spring damper. The torque limiter comprises two plates stacked and integrated in the specified axial direction. The two plates are stacked on the mass damper in the specified axial direction. The input-side rotating member includes an outer plate, which is stacked on the opposite side of the mass damper, separated from the inner plate that contacts the mass damper. The bolts secure the outer and inner side plates to the inertial body in such a manner that they contact the side of the outer side plate. In the inner plate, the portion closer to the inner periphery than the portion in contact with the mass damper is formed to bend towards the mass damper side. The input-side rotating component includes a drive-side rotating component, on which a pair of annular plate-shaped drive plates are connected to both sides. The pair of drive plates are configured to be separated from each other from the outer peripheral side. The head of the bolt protrudes most prominently in the direction of the rotational center axis of the torsional vibration damping device, and the thickness of the outer plate is increased to the end of the head of the bolt.

2. The torsional vibration damping device according to claim 1, wherein, The depth of the receiving portion is formed to be less than or equal to the height of the bolt head.

3. The torsional vibration damping device according to claim 1, wherein, The torsional vibration damping device is configured as follows: The end of the spring damper is located on the side of the mass damper, closer to the tip of the bolt head than in the specified axial direction. The end of the spring damper is located on the side of the mass damper, closer to the end of the receiving portion than in the specified axial direction.

4. The torsional vibration damping device according to any one of claims 1 to 3, wherein, The input-side rotating member is formed such that the portion having the receiving part is thicker than the other portions.

5. The torsional vibration damping device according to any one of claims 1 to 3, wherein, The input-side rotating component further includes an inertial component, which is integrated with the drive-side rotating component in the specified axial direction. The receiving portion is formed in the inertial member.

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