CN115681406A

CN115681406A - Vibration damping device

Info

Publication number: CN115681406A
Application number: CN202110822859.0A
Authority: CN
Inventors: 叶鉴申; 闫少伟
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2021-07-21
Filing date: 2021-07-21
Publication date: 2023-02-03

Abstract

The present invention relates to a vibration damping device. The vibration damping device includes: a flywheel; a flange arranged coaxially with the flywheel and rotatable relative to the flywheel; and the damping spring is abutted between the flywheel and the flange along the rotation direction. Wherein the damper device further comprises a holding plate arranged coaxially with the flywheel and rotatable relative to the flywheel, the holding plate being in frictional contact with the flywheel so as to be able to transmit torque by frictional force. The vibration damping device of the present invention has an improved 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 transmission between the engine and the transmission are the same, i.e., torsional vibrations and rotational non-uniformities should be damped while starting and transmitting 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.

In order to prevent excessive torque from being transmitted to the transmission through the damper device to damage transmission components in the transmission, or to prevent excessive torque from being transmitted in reverse through the damper device to the engine to damage the engine, it is sometimes necessary to integrate a torque limiting mechanism in the damper device. In the known damping devices, the mounting position and the presentation form of the torque damping mechanism differ according to the specific requirements of the drive train. For example, in the vibration damping device disclosed in CN 111795114A, the torque limiter is provided at the side plate assembly of the vibration damping device near the input end, and is connected to the side plate assembly at the radially outer side of the side plate assembly. However, sometimes, depending on the performance requirements of the vehicle driveline, it may be necessary to further advance the mounting position of the torque limiter in the torque transmission path.

Disclosure of Invention

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

The above technical problem is solved by a vibration damping device according to the present invention. The vibration damping device includes: a flywheel; a flange arranged coaxially with the flywheel and rotatable relative to the flywheel; and the damping spring is abutted between the flywheel and the flange along the rotation direction. Wherein the damper device further comprises a holding plate arranged coaxially with the flywheel and rotatable relative to the flywheel, the holding plate being in frictional contact with the flywheel so as to be able to transmit torque by frictional force. In such a damper device, torque can be transmitted by frictional contact between a holding plate provided at the front end of the flywheel in the torque transmission path and the flywheel. Since the maximum torque that can be transmitted by the friction is limited, the maximum torque that can be transmitted by the damping device is also limited, thereby forming a torque limiter to prevent excessive torque from damaging rotating parts in the drive train. The position of such a torque limiter in the torque transmission path is further advanced to the front of the flywheel, so that the demand for the front torque limiter can be satisfied.

According to a preferred embodiment of the present invention, the flywheel may include a main body portion and a counter plate fixedly connected to the main body portion, and the retainer plate may be sandwiched between the main body portion and the counter plate in the axial direction. The retaining plate may provide axial support for frictional contact between the flywheel and the retaining plate.

According to another preferred embodiment of the present invention, the vibration damping device may further include a friction pad and a first diaphragm spring, and one of the main body portion and the counter plate may abut against the holding plate via the friction pad and the other may abut against the holding plate via the first diaphragm spring. The diaphragm spring may provide an axial preload force.

According to another preferred embodiment of the present invention, the pair of plates may be connected to the main body portion on a radially outer side and spaced apart from the main body portion in an axial direction on a radially inner side, and the outer peripheral edge of the retainer plate may extend radially outward between the main body portion and the pair of plates. Thus, the paired plates surround the holding plate from the radially outer side.

According to another preferred embodiment of the present invention, the counter plate may be located radially inward of the damper spring, thereby preventing the damper spring from interfering with the counter plate.

According to another preferred embodiment of the present invention, the pair of plates may be located between the main body portion and the flange in the axial direction. Thus, the counterplate is mounted in the interior space of the vibration damping device.

According to another preferred embodiment of the present invention, the vibration damping device may further include a second friction pad via which the flange abuts the counter plate. Therefore, the paired plates abut between the holding plate and the flange in the axial direction.

According to a further preferred embodiment of the invention, the damping device may further comprise a cover plate which may be fixedly connected to the flywheel on a radially outer side and axially spaced apart from the flywheel on a radially inner side, and the outer periphery of the flange may extend radially outwardly between the flywheel and the cover plate.

According to a further preferred embodiment of the invention, the damping device may further comprise a second diaphragm spring which abuts in the axial direction between the flange and the cover plate. The flange is thus positioned axially between the shroud plate and the counterplate.

According to another preferred embodiment of the present invention, the main body portion, the counter plate, the cover plate and the second diaphragm spring collectively define a lubrication space that encloses the damper spring, so that leakage of grease for lubricating the damper spring can be prevented.

Drawings

The invention is further described below with reference to the accompanying drawings. In the figures, elements having the same function are denoted by the same reference numerals. Wherein:

FIG. 1 shows a cross-sectional view according to an exemplary embodiment of the present invention; and

fig. 2 shows a cross-sectional view of another exemplary embodiment according to 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 for a driveline of a motor vehicle is provided. The vibration damping device may be a disc damper mounted between the engine crankshaft and the transmission for absorbing torque vibrations.

Fig. 1 shows an exemplary embodiment of a vibration damping device according to the invention. As shown in fig. 1, the damper device includes a retainer plate 3, a flywheel 4, a damper spring 10, and a flange 11. The retainer plate 3 is formed in a substantially disc-shaped configuration and extends substantially in a radial plane perpendicular to the axis of rotation of the vibration damping device. The holding plate 3 is connected in a rotationally fixed manner on the radial inside to, for example, a crankshaft 1 of the engine. For example, the holding plate 3 may be fixedly connected to the crankshaft 1 by bolts 2.

The flywheel 4 is a disc-shaped member having a large moment of inertia, and can damp torque vibration by its own moment of inertia. The flywheel 4 is rotatable relative to the holding plate 3 about the axis of rotation of the damper device. As shown in fig. 1, the flywheel 4 may be directly supported on the crankshaft 1 rotatably on the radially inner side. Alternatively, as shown in another exemplary embodiment of fig. 2, the flywheel 4 may also be rotatably supported on the crankshaft 1 by means of a bearing 17. Preferably, the flywheel 4 may be located on the side close to the engine with respect to the retainer plate 3 in the axial direction.

The retainer plate 3 and the flywheel 4 abut against each other in the axial direction, so that a frictional contact area is formed therebetween. Torque can be transmitted between the holding plate 3 and the flywheel 4 by the frictional force generated in the frictional contact area. The amount of friction that can be generated in the friction contact area and therefore the torque that can be transmitted is limited. Thus, the frictional contact area may form a torque limiter between the holding plate 3 and the flywheel 4.

The outer diameter of the flywheel 4 may be larger than the outer diameter of the retainer plate 3. The frictional contact area may be located near the radially outer edge of the retainer plate 3 so that a greater torque can be provided. A first friction lining 5 may be provided in the friction contact area, so that the holding plate 3 and the flywheel 4 may be indirectly in friction contact via the first friction lining 5. The first friction pad 5 can be fixedly connected to one of the holding plate 3 and the flywheel 4, or the first friction pad 5 can be fixedly connected to neither the holding plate 3 nor the flywheel 4, whereby a slip friction can be generated between the first friction pad 5 and the holding plate 3 and/or between the first friction pad 5 and the flywheel 4.

In order to ensure the axial compression force required to generate the frictional force, the flywheel 4 may have a body portion and a counterplate 6 fixedly connected thereto. The holding plate 3 may abut in the axial direction between the main body portion and the opposing plate 6. In particular, the body portion is a disc-shaped portion extending substantially in a radial plane perpendicular to the axis of rotation of the vibration damping device. The counterplate 6 may be fixedly connected to the main body part on the radially outer side (e.g. via screws 8) and axially spaced apart from the main body part on the radially inner side, so that an annular space is formed between the main body part and the counterplate 6, which is open towards the radially inner side. The outer peripheral edge of the retainer plate 3 extends radially outwardly between the main body portion and the counter plate 6. In this case, the holding plate 3 may abut one of the main body portion and the counter plate 6 (the main body portion in the drawing) in the axial direction via the first friction pad 5 on one axial side, and abut the other (the counter plate 6 in the drawing) via the first diaphragm spring 7 on the other axial side. The first diaphragm spring 7 is elastically supported between the holding plate 3 and the opposing plate 6, thereby applying an axial pressing force so that the holding plate 3 stably abuts against the main body portion. Alternatively, the first diaphragm spring 7 may be omitted, and the counterplate 6 may be elastically pressed against the holding plate 3 with a preload.

The flange 11 is located axially on the side of the retaining plate 3 and the flywheel 4 facing away from the engine. The flange 11 is formed as a disc-shaped structure extending substantially in a radial plane perpendicular to the axis of rotation. The flange 11 can rotate relative to the flywheel 4 about the axis of rotation of the damping device.

The damper spring 10 is in contact in the rotational direction between the flywheel 4 and the flange 11, so that torque can be transmitted therebetween. The damper spring 10 can absorb and damp the torque vibration by its elastic deformation. The damping device may include a plurality of damping springs 10 arranged at intervals in the circumferential direction.

When the paired plate 6 is located between the flywheel 4 and the flange 11 in the axial direction, the paired plate 6 may be located radially inside the damper spring 10, thereby avoiding interference of the paired plate 6 with the damper spring 10.

The damping device may further comprise a cover plate 9, the cover plate 9 being fixedly connected to the flywheel 4 on the radially outer side and being axially spaced apart from the flywheel 4 on the radially inner side so as to form an annular space which is open to the radially inner side. The outer periphery of the flange 11 extends radially outwardly between the flywheel 4 and the shroud 9.

The flange 11 may axially abut the counterplate 6 via an annular second friction washer 12 on one axial side, while it may also axially abut the cover plate 9 via a second diaphragm spring 13 and a third friction washer 16 on the other axial side. This allows the flange 11 to be positioned axially relative to the flywheel 4. At the same time, a certain frictional damping can be provided between the flange 11 and the flywheel 4 when the flange 11 is relatively rotated with respect to the flywheel 4 via the damper spring 10. At the outer periphery of the flange 11, a closed annular space is defined by the main body portion of the flywheel 4, the counter plate 6, the cover plate 9 and the second diaphragm spring 13 together. The damper spring 10 may be enclosed in this annular space, and grease is injected therein, so that the space is formed as a lubrication space for the damper spring 10.

In addition, the vibration damping device may also include an output hub 14. The output hub 14 is located radially inside the flange 11 and may be fixedly connected to the flange 11, for example, via rivets 15. The torque of the damper device can be input into, for example, a transmission via the output hub 14. Although not shown, the damper device may also include another flywheel connected to the output hub 14, thereby forming a dual mass flywheel damper.

Fig. 2 shows a vibration damping device according to another exemplary embodiment of the present invention. The damping device of fig. 2 differs from the embodiment of fig. 1 only in the addition of the bearing 17. As described above, the bearing 17 is provided between the flywheel 4 and the crankshaft 1 so as to reduce friction therebetween.

The vibration damping device according to the present invention is provided with the torque limiter, and thus has a better effect of preventing torque shock for the hybrid dedicated transmission. The vibration damping device has simple structure, easy manufacture and low cost. In addition, the damping device requires a relatively small axial space, which is advantageous for a compact structural configuration.

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. Crankshaft

2. Bolt

3. Retaining plate

4. Flywheel wheel

5. First friction lining

6. Matching board

7. First diaphragm spring

8. Screw nail

9. Cover plate

10. Damping spring

11. Flange

12. Second friction liner

13. Second diaphragm spring

14. Output hub

15. Rivet

16. Third friction lining

17. Bearing assembly

Claims

1. A vibration damping device comprising:

a flywheel (4);

a flange (11) arranged coaxially with the flywheel (4) and rotatable with respect to the flywheel (4);

a damper spring (10) that is in contact with the flywheel (4) and the flange (11) in the rotational direction;

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

the vibration damping device further comprises a retaining plate (3), wherein the retaining plate (3) is arranged coaxially with the flywheel (4) and can rotate relative to the flywheel (4), and the retaining plate (3) is in friction contact with the flywheel (4) so as to be capable of transmitting torque through friction force.

2. Damping device according to claim 1, characterized in that the flywheel (4) comprises a main body part and a counterplate (6) fixedly connected to the main body part, the retaining plate (3) being clamped in axial direction between the main body part and the counterplate (6).

3. The vibration damping device according to claim 2, characterized in that it further comprises a friction pad (5) and a first diaphragm spring (7), one of the main body portion and the counter plate (6) abutting the holding plate (3) via the friction pad (5) and the other abutting the holding plate (3) via the first diaphragm spring (7).

4. The vibration damping device according to claim 2, characterized in that the counter plate (6) is connected to the main body portion on a radially outer side and is axially spaced from the main body portion on a radially inner side, and an outer peripheral edge of the retainer plate (3) extends radially outward between the main body portion and the counter plate (6).

5. Damping device according to claim 4, characterized in that the counterplate (6) is located radially inside the damping spring (10).

6. Damping device according to claim 5, characterized in that the counterplate (6) is located axially between the body part and the flange (11).

7. Damping device according to claim 6, characterized in that it further comprises a second friction pad (12), via which second friction pad (12) the flange (11) abuts against the counterplate (6).

8. The vibration damping device according to claim 6, characterized in that the vibration damping device further comprises a cover plate (9), the cover plate (9) being fixedly connected to the flywheel (4) on a radially outer side and being axially spaced apart from the flywheel (4) on a radially inner side, an outer peripheral edge of the flange (11) extending radially outwardly between the flywheel (4) and the cover plate (9).

9. Damping device according to claim 8, characterized in that it further comprises a second diaphragm spring (13), said second diaphragm spring (13) being axially abutted between said flange (11) and said cover plate (9).

10. Damping device according to claim 9, characterized in that the main body part, the counter plate (6), the cover plate (9) and the second diaphragm spring (13) together define a lubrication space enclosing the damping spring (10).