CN112032252A

CN112032252A - Vibration damping device

Info

Publication number: CN112032252A
Application number: CN202010994534.6A
Authority: CN
Inventors: 包顺程
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2020-09-21
Filing date: 2020-09-21
Publication date: 2020-12-04

Abstract

The present invention relates to a vibration damping device. The vibration damping device includes a plurality of rotating members arranged coaxially to transmit torque. The vibration damping device further comprises an elastic piece, the plurality of rotating components comprise a first rotating component and a second rotating component, at least one part of the second rotating component is located between the first rotating component and the elastic piece in the axial direction, and the elastic piece presses the second rotating component on the first rotating component in the axial direction, so that torque can be transmitted between the first rotating component and the second rotating component through friction. The vibration damping device of the present invention has a torque limiting function.

Description

Vibration damping device

Technical Field

The invention relates to the technical field of vehicles. In particular, the invention relates to a vibration damping device for a drive train of a motor vehicle.

Background

Internal combustion engine drives are still used in the foreseeable future of motor vehicles. Regardless of the type of transmission chosen, the basic requirements for torque transfer between the engine and the transmission are the same, i.e., torsional vibrations and rotational non-uniformities should be reduced while starting and transferring the average torque. Therefore, a vibration damping device is generally provided between the engine and the transmission in order to absorb and damp vibration of torque output from the engine.

Fig. 1 shows a schematic representation of a low-cost damping device for a dual clutch transmission. As shown in fig. 1, the damper device includes a holding plate 1, a first flange 2, a second flange 3, a centrifugal pendulum mass 4, a damper spring 5, and an output hub 6. The holding plate 1 serves as an input end of the vibration damping device, into which a torque is input. The first flange 2 and the second flange 3 are axially spaced apart and fixed to each other by rivets or bolts. The retainer plate 1 is clamped between the first flange 2 and the second flange 3 in the axial direction. The plurality of damper springs 5 are in contact with the holding plate 1 and the first and

second flanges

2 and 3 in the rotational direction. The holding plate 1 transmits torque to the first flange 2 and the second flange 3 by the damper springs 5, and the damper springs 5 can absorb torque vibration by elastic deformation. A plurality of centrifugal pendulum masses 4 are mounted on the second flange 3 and can be pivoted relative to the second flange 3 in a plane perpendicular to the axis of rotation. The first flange 2 and the second flange 3 are each connected to the output hub 6 in a rotationally fixed manner, so that a torque is output via the output hub 6.

The damping device is not provided with a flywheel mechanism, so that the damping device has the advantage of low cost compared with a dual-mass flywheel type damping device. However, such a damper device has no function of limiting the torque from the engine, and may transmit excessive torque to the transmission, thereby causing shock or even damage to the transmission.

Disclosure of Invention

Therefore, the technical problem to be solved by the present invention is to provide a vibration damping device having a torque limiting function.

The above-mentioned technical problem is solved by a vibration damping device according to the present invention. The vibration damping device includes a plurality of rotating members arranged coaxially to transmit torque. The vibration damping device further comprises an elastic piece, the plurality of rotating components comprise a first rotating component and a second rotating component, at least one part of the second rotating component is located between the first rotating component and the elastic piece in the axial direction, and the elastic piece presses the second rotating component on the first rotating component in the axial direction, so that torque can be transmitted between the first rotating component and the second rotating component through friction. The elastic piece fixed on the first rotating component provides axial pretightening force for the second rotating component through the elastic force of the elastic piece, so that the first rotating component and the second rotating component can be tightly abutted together along the axial direction. Therefore, when one of the two rotating parts rotates, the other rotating part can be driven to rotate together by the friction force on the contact surface between the two rotating parts, so that the torque is transmitted between the two rotating parts. Since the torque transmission is achieved by friction, and the torque which can be transmitted by friction is limited, when the torque transmitted from the input end of the two rotating components exceeds a certain value, the excessive torque cannot be transmitted to the output end of the two rotating components through the friction contact surface, so that other torque transmitting components in the vibration damping device are protected, and particularly, large impact can be isolated. The elastic element used here can be, for example, a diaphragm spring, or also other suitable elements that can provide an axial pretension, for example, a disk spring, a wave spring, etc.

In order to protect further components in the damping device, such a torque limiting structure may preferably be provided at a position at the front end of the torque transmission path, for example the first rotational member may be a flywheel and the second rotational member may correspondingly be a retaining plate. This arrangement protects more of the torque transmitting components of the damper device, since the flywheel is the component of the damper device that first receives the torque output from the engine.

According to a preferred embodiment of the present invention, the vibration damping device may further include a cover plate fixed to the first rotating member, and at least a portion of the second rotating member is located between the cover plate and the first rotating member in the axial direction. Thus, the second rotating member may be sandwiched between the first rotating member and the cover plate in the axial direction.

According to another preferred embodiment of the invention, the elastic member may abut in the axial direction between the hood plate and the second rotating member. The shroud thus provides a base for mounting and support for the elastomeric member.

According to another preferred embodiment of the present invention, the damping device may further include a support washer fixed to the elastic member, and the elastic member presses the second rotating member through the support washer. The support washer may provide a larger area, more stable contact surface for friction between the elastic member and the second rotating member, thereby obtaining more stable frictional force for transmitting torque.

According to a further preferred embodiment of the invention, the second rotational member may have a body portion and a friction material portion which are rotationally fixedly connected to each other, the second rotational member being pressed against each other in a force-acting manner by the friction material portion with the first rotational member and the elastic member, respectively. Alternatively, the second rotary member may have a main body portion and a friction material portion that are relatively rotatable at least within a certain angle, the second rotary member being pressed against each other by the friction material portion in a force-acting manner with the first rotary member and the elastic member, respectively. The friction material may have better friction characteristics than the material (e.g., metal) of the main body portion of the second rotating member, thereby achieving higher, more stable friction, and may also have better wear resistance.

According to another preferred embodiment of the present invention, friction material portions may be provided on both axial side surfaces of the body portion, respectively. Thus, at least a part of the main body portion is located axially between the first rotating member and the shroud plate, and one side thereof abuts against the first rotating member through the friction material portion, and the other side abuts against the shroud plate through the friction material and the elastic member.

According to alternative embodiments of the invention, the friction material portion may also be located radially outward or radially inward of the body portion. In this case, the friction material portion may be non-rotatably connected to the body portion by means of splines or the like, or may be fixed to the body portion by other means. At this time, the main body portion does not need to extend between the first rotating member and the cover plate, but may be directly abutted between the first rotating member and the elastic member by a single friction material portion.

According to another alternative embodiment of the invention, the cover plate may be located axially between the second rotational member and an elastic member that presses the second rotational member through the cover plate. In this case, the second rotating member may have a main body portion connected to each other in a rotationally fixed manner and friction material portions fixed to both axial side surfaces of the main body portion, respectively, by which the second rotating member is pressed against the first rotating member and the cover plate, respectively, in a force-acting manner. Alternatively, the second rotary member may have a main body portion and a friction material portion that are relatively rotatable at least within a certain angle, the second rotary member being pressed against each other by the friction material portion in a force-acting manner with the first rotary member and the elastic member, respectively.

Drawings

The invention is further described below with reference to the accompanying drawings. Identical reference numbers in the figures denote functionally identical elements. Wherein:

fig. 1 shows a schematic view of a damping device according to the prior art;

fig. 2 shows a schematic view of a vibration damping device according to a first embodiment of the present invention;

fig. 3 shows a schematic view of a vibration damping device according to a second embodiment of the present invention; and

fig. 4 shows a schematic view of a vibration damping device according to a third embodiment of the present invention.

Detailed Description

Hereinafter, specific embodiments of the vibration damping device according to the present invention will be described with reference to the accompanying drawings. The following detailed description and drawings are included to illustrate the principles of the invention, which is not to be limited to the preferred embodiments described, but is to be defined by the appended claims.

According to an embodiment of the present invention, a vibration damping device, in particular a disc vibration damper, is provided. Such a vibration damping device may be applied in a drive train of a motor vehicle, which is generally disposed between an engine and a transmission, for absorbing and damping vibrations and shocks in torque from the engine.

Fig. 2 shows a first embodiment of the vibration damping device according to the invention. The vibration damping device according to the first embodiment includes a flywheel 11, a retainer plate 12, a flange assembly, and an output hub 15, which are coaxially arranged. The flywheel 11 is a substantially disc-shaped member that serves as an input end of the damper device to receive torque from, for example, an engine. The flywheel 11 generally has a large moment of inertia, and thus can damp the vibration of the input torque by its own moment of inertia. The retainer plate 12, flange assembly and output hub 15 are mounted on the side of the flywheel 11 remote from the input.

The flange assembly comprises a first flange 13 and a second flange 13' fixedly connected to each other. The first flange 13 and the second flange 13' are respectively substantially disc-shaped members which are spaced apart from each other in the axial direction and may be connected to each other by means of, for example, rivets or bolts. Wherein the first flange 13 is axially closer to the flywheel 11 than the second flange 13'. One or more centrifugal pendulum masses 16 are mounted on a radially outer part of the second flange 13'. These centrifugal pendulum masses 16 can be pivoted relative to the second flange 13 'along a pendulum track on the second flange 13' in a plane perpendicular to the axis of rotation of the damping device, in order to damp the torque oscillations transmitted to the flange assembly. The centrifugal pendulum mass 16 can preferably be located axially on the side of the second flange 13' facing away from the flywheel 11. The output hub 15 is mounted radially inside the first and second flanges 13, 13' and is non-rotatably connected to the flange assembly, for example by means of splines or crimping.

The holding plate 12 is also a substantially disc-shaped member. A radially inner portion of the retainer plate 12 is mounted axially between the first and second flanges 13, 13'. Spring windows corresponding to each other are formed in the holding plate 12, the first flange 13, and the second flange 13', respectively, for mounting the damper springs 17. The damper spring 17, for example, in the form of a coil spring, is abutted substantially in the rotational direction between the holding plate 12 and the flange assembly, so that torque can be transmitted between the holding plate 12 and the flange assembly, and vibration of the torque is absorbed by elastic deformation of itself.

As shown in fig. 2, the damper device further includes a substantially annular cover plate 18 fixed to the flywheel 11. The radially outer portion of the shroud plate 18 is fixed to the flywheel 11 by, for example, screws or the like, or may be formed integrally with the flywheel 11. While the radially inner portion of the shroud plate 18 is offset relative to the radially outer portion in an axial direction away from the flywheel 11 so as to be axially spaced from the flywheel 11. The radially outer portion of the retainer plate 12 is located axially between the flywheel 11 and the radially inner portion of the shroud plate 18. The damping device further comprises an elastic member 14. The elastic member 14 may be a diaphragm spring, for example, or may be another type of elastic member such as a wave spring. The elastic member 14 is fixed to a radially inner portion of the shroud plate 18 so as to be indirectly fixed to the flywheel 11 via the shroud plate 18. The elastic member 14 axially abuts between the cover plate 18 and the holding plate 12, thereby applying an axial elastic force to the holding plate 12 to press the holding plate 12 against the flywheel 11 in the axial direction. In this case, the flywheel 11 can transmit torque to the holding plate 12 by the frictional force generated on the contact surface. Since the amount of torque that can be transmitted by friction is limited, when the torque on the flywheel 11 exceeds a certain limit value, the torque transmitted to the holding plate 12 by friction does not continue to increase with it, but is limited to within a limit torque.

In order to better transmit torque between the flywheel 11 and the holding plate 12 by friction, the holding plate 12 may preferably have a main body portion and a friction material portion 121. The main body portion of the retainer plate 12 is generally made of, for example, a metal material, and two friction material portions 121 are fixed to the surfaces of the main body portion on both axial sides thereof, respectively. The holding plate 12 abuts on one axial side against the flywheel 11 through the friction material portion 121, while being force-operatively connected to the elastic member 14 on the other axial side through the other friction material portion 121, it being simply provided that this other friction material portion 121 can be brought into direct abutment against the elastic member 14. The friction material portion 121 has stable and good friction performance, and thus contributes to stable torque transmission between the flywheel 11 and the holding plate 12, and effectively reduces or prevents wear of the contact surfaces.

Preferably, the damping device may further comprise a support washer 19. A support washer 19 is fixed on the elastic member 14, and the elastic member 14 is indirectly abutted to the holding plate 12 through the support washer 19. The presence of the support washer 19 makes the contact area between the elastic member 14 and the holding plate 12 larger, so that it is possible to ensure that a stable frictional force is obtained on the contact surface between the elastic member 14 and the holding plate 12.

Fig. 3 shows a second embodiment of the vibration damping device according to the invention. In the second embodiment, components having a corresponding relationship are denoted by like reference numerals as those of the first embodiment. The flywheel 21, the first flange 23, the second flange 23', the output hub 25, the centrifugal pendulum mass 26, and the damper spring 27 of the second embodiment are the same as those of the first embodiment, and thus are not described again. Only the differences of the second embodiment from the first embodiment will be described below.

As shown in fig. 3, in the vibration damping device according to the second embodiment, the shroud plate 28 is located between the elastic member 24 and the holding plate 22 in the axial direction. The elastic member 24 presses a radially inner portion of the shroud plate 28 toward the flywheel 21, so that the shroud plate 28 directly abuts on the retainer plate 22 in the axial direction, and further presses the retainer plate 22 onto the flywheel 21 in the axial direction. Therefore, the retainer plate 22 is directly pressed between the flywheel 21 and the shroud plate 28 in the axial direction. In this case, since it is the cover plate 28, not the elastic member 24, that directly contacts the holding plate 22, there is no need to provide a support washer. Similar to the first embodiment, friction material portions 221 may also be provided on both axial side surfaces of the main body portion of the retainer plate 22, respectively, for making frictional contact with the flywheel 21 and the shroud plate 28, respectively. Alternatively, in the second embodiment, the shroud plate 28 may not be provided so that the elastic member 24 fixed to the flywheel 21 directly abuts against the holding plate 22.

Fig. 4 shows a third embodiment of the vibration damping device according to the invention. In the third embodiment, components having a corresponding relationship are denoted by like reference numerals as those of the first embodiment. The flywheel 31, the first flange 33, the second flange 33', the output hub 35, the centrifugal pendulum mass 36, and the damper spring 37 of the third embodiment are the same as those of the first embodiment, and thus are not described again. Only the differences of the third embodiment from the first embodiment will be described below.

As shown in fig. 4, in the vibration damping device according to the third embodiment, the friction material portion 321 of the retainer plate 32 may be located radially outside the body portion and connected to the body portion in a torque-proof manner. The friction material portion 321 directly abuts the flywheel 31 on one axial side and abuts the elastic member 34 on the other axial side. The friction material portion 321 may directly abut the elastic member 34, or may indirectly abut the elastic member 34 through the support washer 39. In this case, since only one friction material portion 321 needs to be provided, material and production costs can be saved. The torque-resistant connection of the friction material portion 321 of the holding plate 32 to the body portion can be realized, for example, by splines, or can also be realized by integral formation or in another way. Connecting the friction material portion 321 to the body portion by splines is particularly advantageous as it helps to avoid significant stresses between components formed of two different materials and is easy to assemble.

The vibration damping device can effectively limit excessive torque, and has the advantages of simple structure and easy production. Various modifications of the above-described embodiments are also possible within the scope of the concept according to the invention, in particular with regard to the position of the components forming the friction torque. For example, where the unitary construction permits, the portion of the retaining plate that makes frictional contact with the flywheel may also be a radially inner portion thereof. In addition, two other components of the vibration damping device that can rotate relative to each other may be used to transmit a limited torque by friction.

Although the friction material portion is fixed to the holding plate in the first and second embodiments, other arrangements may be adopted, for example, the friction material portion and the holding plate may be relatively rotatable, that is, a friction torque may be generated between the friction material portion and the holding plate, and more sets of friction pairs may be generated.

The elastic element can be arranged in a fixed manner with the cover plate and/or the support washer, i.e. can rotate together with the cover plate and/or the support washer in a relatively fixed manner. It may also be arranged freely rotatably with the cover plate and/or the support washer, i.e. freely rotatable relative to the cover plate and/or the support washer. Alternatively, the resilient member can be arranged to rotate freely relative to the shroud and/or support washer within an angle and to rotate relatively fixedly together beyond that angle.

Although possible embodiments have been described by way of example in the above description, it should be understood that numerous embodiment variations exist, still by way of combination of all technical features and embodiments that are known and that are obvious to a person skilled in the art. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the invention in any way. From the foregoing description, one of ordinary skill in the art will more particularly provide a technical guide to convert at least one exemplary embodiment, wherein various changes may be made, particularly in matters of function and structure of the components described, without departing from the scope of the following claims.

List of reference numerals

1 holding plate

2 first flange

3 second flange

4 centrifugal pendulum mass

5 damping spring

6 output hub

11 flywheel

12 holding plate

121 friction material part

13 first flange

13' second flange

14 elastic member

15 output hub

16 centrifugal pendulum mass

17 damping spring

18 cover plate

19 support washer

21 flywheel

22 holding plate

221 friction material portion

23 first flange

23' second flange

24 elastic member

25 output hub

26 centrifugal pendulum mass

27 damping spring

28 cover plate

31 flywheel

32 holding plate

321 friction material portion

33 first flange

33' second flange

34 elastic member

35 output hub

36 centrifugal pendulum mass

37 damping spring

38 cover plate

39 support washer

Claims

1. A vibration damping device includes a plurality of rotating members coaxially arranged to transmit torque,

it is characterized in that the preparation method is characterized in that,

the vibration damping device includes an elastic member (14, 24, 34), the plurality of rotating members include a first rotating member and a second rotating member, at least a portion of the second rotating member is located between the first rotating member and the elastic member (14, 24, 34) in the axial direction, and the elastic member (14, 24, 34) presses the second rotating member against the first rotating member in the axial direction so that torque can be transmitted between the first rotating member and the second rotating member by friction.

2. The vibration damping device according to claim 1, further comprising a cover plate (18, 38) fixed to the first rotating member, the at least a portion of the second rotating member being located axially between the cover plate (18, 38) and the first rotating member.

3. Damping device according to claim 2, characterized in that the elastic element (14, 34) abuts axially between the cover plate (18, 38) and the second rotational part.

4. Damping device according to claim 3, characterized in that it further comprises a support washer (19, 39) fixed to the elastic member (14, 34), the elastic member (14, 34) pressing the second rotational member through the support washer (19, 39).

5. Damping device according to claim 3 or 4, characterized in that the second rotational member has a body part and a friction material part (121, 321) which are rotationally fixedly connected to each other, the second rotational member being pressed force-wise against each other by the friction material part (121, 321) with the first rotational member and the elastic element (14, 34), respectively; or,

the second rotating part has a body part and a friction material part (121, 321) which are rotatable relative to each other at least within a certain angle, and the second rotating part is pressed against the first rotating part and the elastic part (14, 34) in a force-acting manner by the friction material part (121, 321), respectively.

6. The vibration damping device according to claim 5, wherein the friction material portions (121) are provided on both axial side surfaces of the main body portion, respectively.

7. Damping device according to claim 5, characterized in that the friction material part (321) is located radially outside or radially inside the body part.

8. The vibration damping device according to claim 2, characterized in that the cover plate (28) is located axially between the second rotational member and the elastic member (24), the elastic member (24) pressing the second rotational member through the cover plate (28).

9. The vibration damping device according to claim 8, characterized in that the second rotational member has a main body portion which is connected to each other in a rotationally fixed manner and friction material portions (221) which are fixed to both axial side surfaces of the main body portion, respectively, and the second rotational member is pressed against each other by the friction material portions (221) in a force-acting manner with the first rotational member and the cover plate (28), respectively; or,

10. Damping device according to any one of claims 1 to 9, characterized in that the first rotational component is a flywheel (11, 21, 31) and the second rotational component is a retaining plate (12, 22, 32).