CN218294322U

CN218294322U - Vibration damper unit for a motor vehicle

Info

Publication number: CN218294322U
Application number: CN202090000899.6U
Authority: CN
Inventors: A·鲁施; F·吕贝尔; L·索瑞特
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2019-12-18
Filing date: 2020-10-20
Publication date: 2023-01-13
Anticipated expiration: 2030-10-20
Also published as: WO2021121465A1; DE102019134866A1

Abstract

A shock absorber unit for a motor vehicle comprising at least a shock absorber and a torque limiter, said shock absorber and torque limiter having a common axis of rotation extending in an axial direction; wherein the vibration damper has a primary part and a secondary part and at least one first spring element, wherein the torque limiter has at least one first pressure plate having at least one friction surface section and a support section which are arranged at a distance from one another in the axial direction and in the radial direction, wherein the first pressure plate is connected in a rotationally fixed manner via the friction surface section to a friction partner which is part of the vibration damper, until a limit value of the transmitted torque is reached, wherein the pressing force required for this purpose is provided by a second spring element which is supported on the one hand at a further component of the torque limiter and on the other hand at the support section.

Description

Vibration damper unit for a motor vehicle

Technical Field

The present invention relates to a damper unit for a motor vehicle, in particular for a motor vehicle, for example a hybrid vehicle, having at least one electric machine as at least one drive unit. The damper unit includes at least one damper and a torque limiter. In particular, the damper unit additionally comprises a centrifugal force pendulum.

Background

The vibration damper (also referred to as a torsional vibration damper) includes a torsional flexibility which is deliberately introduced into the drive train excited by periodic disturbances. The damper has a primary part and a secondary part, which are rotatable in a limited manner in the circumferential direction relative to one another against the spring force of a first spring element when torque is transmitted, and at least one first spring element. The aim in this case is to shift the disturbing resonance occurring in different operating situations into a rotational speed range which is as low as possible below the operating rotational speed. The resonance remaining in the rotational speed range is damped by external or integrated friction means, the friction torque of which must lie within defined limits. The friction device can be designed in particular independently of the torsional flexibility.

Torque limiters are used in particular to protect the drive train. The torque limiter prevents transmission of torque exceeding a limit value. The construction of the torque limiter comprises, inter alia: a plurality of friction linings, preferably two friction linings, which are each connected in a friction-fit, form-fit or material-fit manner to the side plates or the support plate (also referred to as pressure plate); and a friction plate (friction partner for the pressure plate). The friction plates are located between friction linings, which transmit the torque via friction to the friction plates and are applied in particular on the flywheel side. The pressing force is generated by one or more disk springs (second spring elements).

Centrifugal force pendulums are used in particular to reduce torsional oscillations in drive trains. The centrifugal force pendulum is used in particular in a motor vehicle, preferably in a drive train of the motor vehicle. The centrifugal force pendulum is provided in particular for reducing engine-induced torsional oscillations. The centrifugal force pendulum comprises at least one flange (as a flywheel mass) and a plurality of pendulum masses, which are arranged movably on the flange. By means of the pendulum mass, a restoring moment directed against rotational irregularities can be generated during operation of the centrifugal pendulum.

From earlier, unpublished DE 10 2019 120.5, a damper unit with a damper, a torque limiter and a centrifugal force pendulum is known. The damper comprises a spring damper having a primary part and a secondary part which is spring-supported in a rotational direction about a central rotational axis relative to the primary part. The torque limiter comprises two friction partners which are permanently connected to one another in a rotationally fixed manner during operation up to a defined torque threshold. The torque limiter and the centrifugal force pendulum are operatively connected to the secondary part. The first friction partner of the torque limiter is connected to the secondary part and the second friction partner of the torque limiter is connected to a side plate of a housing of the centrifugal force pendulum which accommodates a plurality of pendulum masses, wherein the torque limiter is arranged relative to the centrifugal force pendulum in such a way that the pendulum masses are radially inside the contact point formed between the friction partners and at least partially axially at the same height as the first friction partner.

The first friction partner here comprises a connecting plate which extends from the secondary part in the radial direction outwards and is connected there to a further plate via a rivet connection, from which the further plate extends between the friction linings. Due to the connecting plate, a large axial installation space is required. The installation space is thereby limited for the provision of the damper and its spring element. The torque limiter with the friction lining is located radially outside the centrifugal force pendulum, so that a large plate (large diameter) is required for the pressure plate carrying the friction lining, which leads to a high moment of inertia.

SUMMERY OF THE UTILITY MODEL

Starting from this, the invention is based on the object of at least partially alleviating the problems mentioned at the outset. In particular, a damper unit should be proposed which is of compact design and in this case has a low moment of inertia for the torque limiter.

This object is achieved by means of a shock absorber unit according to the present invention.

A shock absorber unit for a motor vehicle is proposed. The damper unit comprises at least one damper and a torque limiter, which have a common axis of rotation extending in an axial direction. The damper has a primary part and a secondary part, which are rotatable in a limited manner in the circumferential direction relative to one another against the spring force of a first spring element when torque is transmitted, and at least one first spring element. The torque limiter has at least one first pressure plate with at least one friction surface section and a support section, which are arranged spaced apart from one another in the axial direction and in the radial direction. The first pressure plate is connected in a rotationally fixed manner via a friction surface section to a friction partner which is part of the vibration damper until a limit value of the transmitted torque is reached. The pressing force required for this (i.e. for the rotationally fixed connection) is provided by a second spring element which is supported on the one hand at the other component of the torque limiter and on the other hand at the support section.

A friction lining is provided in particular between the friction surface section and the friction partner. In the region of the friction surface section, the friction partner is contacted in order to form a rotationally fixed connection. If the torque exceeds the limit value, the friction partners slip relative to one another in the circumferential direction.

The second spring element is in particular a disk spring, which extends annularly around the axis of rotation.

In particular, the secondary part is a friction partner. The secondary part extends in particular at least in the radial direction towards the friction surface section. The secondary part and the friction surface section are arranged overlapping one another in the radial direction and form a friction pairing in the overlapping region.

In particular, the torque limiter has a second pressure plate, wherein the friction partner is arranged in the axial direction between a friction surface section of the first pressure plate and a (friction surface section) of the second pressure plate. The friction surface section and the support section are disposed on different sides of the second pressure plate with respect to the axial direction.

In particular, the first pressure plate extends from the friction surface section and the first side of the second pressure plate through the at least one opening of the second pressure plate in the region between the friction surface section and the support section towards the second side of the second pressure plate. In particular, the second pressure plate has a plurality of openings which are distributed in the circumferential direction. In particular, the region of the first platen extends through each of the openings.

In particular, the second spring element is arranged in the axial direction between the support region of the first pressure plate and the second side of the second pressure plate. In particular, the second spring element is thus supported at the second side of the second pressure plate. The second pressure plate then forms the other component of the torque limiter, at which the second spring element is supported.

The friction surface section of the first pressure plate is pressed against the first side of the second pressure plate by means of the second spring element, so that the rotationally fixed connection is thereby achieved up to a limit value.

In particular, one of the pressure plates (preferably the first pressure plate) has a threaded bore into which a mating threaded element can be screwed for actuating the other (second) pressure plate, so that the rotationally fixed connection to the friction partner can be released.

The second pressure plate can be spaced further apart from the first pressure plate via a mating threaded element (e.g. a screw) so that the friction-fit connection between the pressure plate and the friction counterpart, e.g. the secondary part, can be released.

In particular, the second spring element is arranged in the radial direction within the friction surface section, i.e. in particular between the friction surface section and the axis of rotation.

In particular, the first spring element is arranged outside the friction surface section in the radial direction.

In particular, a centrifugal pendulum having a plurality of pendulum masses is connected to the damper unit in a rotationally fixed manner, wherein the pendulum masses and the friction surface sections are arranged at least partially overlapping in relation to the radial direction.

In particular, the centrifugal force pendulum has a flange, to which a pendulum mass is movably fastened. In particular, the flange is connected to the torque limiter in a rotationally fixed manner. In particular, the flange is connected to the second pressure plate in a rotationally fixed manner. In particular, the flange is connected to the torque limiter via at least one rivet connection.

In particular, the first spring element of the vibration damper is arranged outside the friction surface section and outside the pendulum mass in the radial direction.

In particular, a large installation space for the vibration damper can be provided by the proposed design. In particular, the pressure plate can be designed to be smaller, since the friction surface section is arranged on a small diameter.

In particular, the centrifugal force pendulum has at least one window, through which the threaded bore is accessible. In particular, the centrifugal force pendulum has a window through which the centrifugal force pendulum can be joined to the damper unit, for example, via a rivet.

In particular, the centrifugal force pendulum has a burst protection, so that, for example, the pendulum mass cannot escape from the centrifugal force pendulum even in the event of a structural failure of the centrifugal force pendulum.

In particular, the damper unit has a hub part for connection to a shaft (e.g. a transmission input shaft), wherein the hub part has ribs extending in the radial direction and in the circumferential direction. The rib is arranged between two components of the damper unit via a clamping connection.

The two components include, in particular, a component of a torque limiter (e.g., a pressure plate) and a component of a centrifugal force pendulum (e.g., a flange). In particular, one component is the second pressure plate and the other component is the flange.

In particular, the damper unit is connected to the hub part via a toothing (for example at the second pressure plate) in a form-fitting manner in relation to the circumferential direction.

In particular, the second pressure plate extends in the radial direction as far as the toothing and contacts the rib by means of the flank. In particular, the flange extends in the radial direction and contacts the rib by means of a lateral surface, wherein the second pressure plate and the flange are arranged on different sides of the rib. The rib is arranged between the second pressure plate and the flange and is connected to the component, in particular via a press connection. Thereby, no connection between the damper unit and the hub, for example via screws or rivets, is required.

In particular, the hub portion comprises a sintered material. The sintered material comprises a powdered starting material, so that it is shaped by pressing (green body). The green body can subsequently be subjected to a heat treatment in which the powder particle materials are connected to one another in a matched manner (sintered part).

In particular, a torque can be introduced into the damper unit, for example, from the internal combustion engine via the primary part. In particular, the torque is transmitted to the torque limiter via the damper and the secondary part. The torque is drawn off from the torque limiter and, if necessary, is transferred via the hub part from the damper unit or to a shaft, for example a transmission input shaft.

The damper unit can be used in particular in a motor vehicle, preferably in a drive train of the motor vehicle.

The use of the indefinite articles "a" and "an" in particular in the claims and in the specification reciting said claims is to be understood as meaning the indefinite articles themselves, and not as meaning the words "a" or "an". Correspondingly, terms or components introduced thereby are therefore to be understood as meaning their presence at least once and in particular also a plurality of times.

It is to be noted preventively that the terms "first", "second" and "first" are used here primarily (exclusively) to distinguish a plurality of similar objects, variables or processes, so that the relevance and/or the order of the objects, variables or processes to one another is not to be predetermined in particular. If correlations and/or sequences are required, this is explicitly stated herein or will be apparent to one of ordinary skill in the art upon learning the specifically described design. As long as a component can be present multiple times ("at least one"), the description of one of the components can apply equally to all or a part of the plurality of components, but this is not mandatory.

Drawings

The invention and the technical field are explained in detail below with reference to the drawings. It is to be noted that the present invention should not be limited by the detailed embodiments. In particular, it is also possible to extract sub-aspects of the facts illustrated in the drawings and combine them with other components and knowledge in the present specification, unless otherwise specified in detail. It is to be noted in particular that the figures and the particularly illustrated size relationships are merely suitable. The figures show:

FIG. 1 illustrates a side view in cross-section of a known shock absorber unit;

figure 2 shows a side view in section of a part of the shock absorber unit according to figure 1;

FIG. 3 shows detail III of FIG. 2; and is

Fig. 4 shows a sectional side view of the damper unit.

Detailed Description

Fig. 1 shows a sectional side view of a known damper unit 1. Fig. 2 shows a sectional side view of a part of the damper unit 1 according to fig. 1. Fig. 3 shows a detail III of fig. 2. Fig. 1 to 3 are collectively described hereinafter.

The damper unit 1 includes a damper 2, a torque limiter 3, and a centrifugal force pendulum 24. The damper 2 comprises a primary part 6 and a secondary part 7 which is supported in the rotational direction about the central rotational axis 5 relative to the primary part 6 by means of a first spring element 8. The torque limiter 3 comprises two friction partners which are permanently connected to one another in a rotationally fixed manner during operation up to a defined torque threshold. The torque limiter 3 and the centrifugal force pendulum 24 are operatively connected to the secondary part 7. The first friction partner of the torque limiter 3 is connected to the secondary part 7, and the second friction partner of the torque limiter 3 is connected to a side plate of a housing of a centrifugal force pendulum 24, which accommodates a plurality of pendulum weights 23, wherein the torque limiter 3 is arranged relative to the centrifugal force pendulum 24 such that the pendulum weights 23 are radially inside the contact points formed between the friction partners and at least partially axially at the same height as the first friction partner.

The first friction partner 14 here comprises a web 30 which extends from the secondary part 7 in the radial direction 13 to the outside and is connected there via a rivet connection to a further plate which extends from there between the friction linings and extends through the friction surface section 11. The torque limiter 3 comprises a second spring element 15, by means of which the friction linings are connected to one another in a rotationally fixed manner.

Due to the connecting plate 30, a large axial installation space is required. The installation space is thereby limited for the arrangement of the vibration damper 2 and its first spring element 8. The torque limiter 3 with the friction lining is located radially outside the centrifugal force pendulum 24, so that large plate elements (large diameters) are required for the

pressure plates

10, 16 carrying the friction lining, which results in a high moment of inertia.

Fig. 4 shows a sectional side view of the damper unit 1. Reference is made to the embodiments of figures 1 to 3.

The damper unit 1 comprises at least one damper 2 and a torque limiter 3, which have a common axis of rotation 5 extending in an axial direction 4. The vibration damper 2 has a primary part 6 and a secondary part 7 and a first spring element 8, wherein the primary part 6 and the secondary part 7 are rotatable in a limited manner in relation to one another in the circumferential direction 9 against the spring force of the first spring element 8 when torque is transmitted. The torque limiter 3 has a first pressure plate 10 with a friction surface section 11 and a support section 12, which are arranged spaced apart from one another in the axial direction 4 and in the radial direction 13. The first pressure plate 10 is connected in a rotationally fixed manner via a friction surface section 11 to a friction partner 14, which is part of the vibration damper 2, until a limit value of the transmitted torque is reached. The pressing force required for this (i.e. for the rotationally fixed connection) is provided by a second spring element 15 which is supported on the one hand at a further component of the torque limiter 3 and on the other hand at the support section 12.

A friction lining is arranged between the friction surface section 11 and the friction partner 14. In the region of the friction surface section 11, a friction partner is contacted for forming a rotationally fixed connection. If the torque exceeds the limit value, the friction partners slip relative to one another in the circumferential direction 9.

The second spring element 15 is a disk spring, which extends annularly about the axis of rotation 5.

The secondary part 7 is a friction partner 14. The secondary portion 7 extends at least in the radial direction 13 towards the friction surface section 11. The secondary part 7 and the friction surface section 11 are arranged overlapping one another in the radial direction 13 and form a friction pair in the overlapping region.

The torque limiter 3 has a second pressure plate 16, wherein a friction partner 14 is arranged in the axial direction 4 between the friction surface section 11 of the first pressure plate 10 and the friction surface section of the second pressure plate 16. The friction surface section 11 and the support section 12 are arranged on different sides 17, 18 of the second pressure plate 16 with respect to the axial direction 4.

The first pressure plate 10 extends from the friction surface section 11 and the first side 17 of the second pressure plate 16 through an opening 20 of the second pressure plate 16 in a region 19 between the friction surface section 11 and the support section 12 towards the second side 18 of the second pressure plate 16.

The second spring elements 16 are arranged along the axial direction 4 between the support region 12 of the first pressure plate 10 and the second side 18 of the second pressure plate 16. The second spring element 15 is supported at a second side 18 of the second pressure plate 16. The second pressure plate 16 forms a further component of the torque limiter 3, at which the second spring element 15 is supported.

The friction surface section 11 of the first pressure plate 10 is pressed via the second spring element 15 against the first side 17 of the second pressure plate 16, so that a rotationally fixed connection is thereby achieved up to a limit value.

The first pressure plate 10 has threaded holes 21 into which mating threaded elements 22 can be screwed for actuating the second pressure plate 16 in such a way that a rotationally fixed connection to the friction partner 14 can be released.

Via the mating thread element 22, the second pressure plate 16 can be spaced further apart from the first pressure plate 10, so that the friction-fit connection between the

pressure plates

10, 16 and the friction fit 14 at this secondary part 7 can be released.

The second spring element 15 is arranged in the radial direction 9 within the friction surface section 11, i.e. between the friction surface section 11 and the axis of rotation 5.

The first spring element 8 is arranged outside the friction surface section 11 in the radial direction 13.

A centrifugal pendulum 24 having a plurality of pendulum masses 23 is connected to the damper unit 1 in a rotationally fixed manner, wherein the pendulum masses 23 and the friction surface section 11 are arranged at least partially overlapping in relation to the radial direction 13.

The centrifugal force pendulum 24 has a flange 33, to which the pendulum mass 23 is movably fastened. The flange 33 is connected to the torque limiter 3 in a rotationally fixed manner. The flange 33 is connected in a rotationally fixed manner to the second pressure plate 16 via a rivet connection.

The first spring element 8 of the vibration damper 2 is arranged in the radial direction 13 outside the friction surface section 11 and outside the pendulum mass 23.

The centrifugal force pendulum 24 has at least one window (not shown) through which at least the threaded bore 21 is accessible. In particular, the centrifugal force pendulum 24 has a window (not shown), through which the centrifugal force pendulum 24 can be joined to the damper unit 1, in this case to the second pressure plate 16, via a rivet.

The damper unit 1 has a hub part 25 for connection to a shaft 26 (e.g. a transmission input shaft), wherein the hub part 25 has a rib 27 extending in the radial direction 13 and in the circumferential direction 9. The rib 27 is arranged between the two components, in this case between the flange 33 and the second pressure plate 16 of the damper unit 1, via the clamping connection 28.

The damper unit 1 is connected to the hub part 25 via the toothing 32 on the second pressure plate 16 in a form-fitting manner with respect to the circumferential direction 9.

The second pressure plate 16 extends in the radial direction 13 up to the toothing 32 and contacts the rib 27 by means of the flank. The flange 33 extends in the radial direction 13 and contacts the rib 27 via a lateral surface, wherein the second pressure plate 16 and the flange 33 are arranged on different sides of the rib 27.

From an internal combustion engine (not shown, only screws 29 are shown) via which the primary part 6 is connected, for example, to a flywheel, torque is introduced into the damper unit 1 via the primary part 6. The torque is transmitted to the torque limiter 3 via the damper 2 and the secondary part 7. The torque is drawn off from the torque limiter 3 and is transferred from the damper unit 1 via the hub section 25 or to a shaft 26, for example to a transmission input shaft.

The flange 31 at the flange 33 forms a burst protection for the centrifugal force pendulum 24. The other flange 31 is arranged in the radial direction 13 within the pendulum mass 23 and forms a burst protection there.

Description of the reference numerals

1 damper unit 2 damper 3 torque limiter 4 axial direction 5 rotation axis 6 primary part 7 secondary part 8 first spring element 9 circumferential direction 10 first presser plate 11 friction surface section 12 support radial direction 13 friction counterpart 15 second spring element 16 second presser plate 17 first side 18 second side 19 area 20 threaded hole 22 cooperating threaded element 23 pendulum block 24 centrifugal force pendulum 25 hub part 26 shaft 27 rib 28 clamp connection 29 screw 30 web 31 flange 32 tooth 33 flange.

Claims

1. A shock absorber unit (1) for a motor vehicle, comprising at least a shock absorber (2) and a torque limiter (3), characterized in that said shock absorber and torque limiter have a common axis of rotation (5) extending in an axial direction (4); wherein the damper (2) has a primary part (6) and a secondary part (7) and at least one first spring element (8), wherein the primary part (6) and the secondary part (7) are limitedly rotatable relative to each other in the circumferential direction (9) against the spring force of the first spring element (8) when transmitting torque, wherein the torque limiter (3) has at least one first pressure plate (10), the first pressure plate has at least one friction surface section (11) and a support section (12), the friction surface section and the support section are arranged spaced apart from each other in the axial direction (4) and in the radial direction (13), wherein the first pressure plate (10) is connected in a rotationally fixed manner via the friction surface section (11) to a friction partner (14) which is part of the vibration damper (2) until a limit value of the transmitted torque is reached, wherein the pressing force required for this is provided by a second spring element (15) which is supported on the one hand at a further component of the torque limiter (3) and on the other hand at the support section (12), wherein a centrifugal force pendulum (24) having a plurality of pendulum masses (23) is connected to the damper unit (1) in a rotationally fixed manner, wherein the pendulum mass (23) and the friction surface section (11) are arranged at least partially overlapping with respect to the radial direction (13).

2. Damper unit (1) according to claim 1, characterized in that the secondary part (7) is the friction counterpart (14).

3. Damper unit (1) according to claim 1, characterized in that the torque limiter (3) has a second pressure plate (16), wherein the friction counterpart (14) is arranged between the friction surface section (11) of the first pressure plate (10) and the second pressure plate (16) along the axial direction (4), wherein the friction surface section (11) and the support section (12) are arranged on different sides (17, 18) of the second pressure plate (16) with respect to the axial direction (4).

4. Damper unit (1) according to claim 3, characterized in that the first pressure plate (10) extends from the friction surface section (11) and the first side (17) of the second pressure plate (16) through at least one opening (20) of the second pressure plate (16) in a region (19) between the friction surface section (11) and the support section (12) towards the second side (18) of the second pressure plate (16).

5. Damper unit (1) according to claim 4, characterized in that one of the pressure plates (10, 16) has a threaded hole (21) into which a mating threaded element (22) can be screwed for operating the other pressure plate (16, 10) such that the rotationally fixed connection to the friction counterpart (14) is releasable.

6. A damper unit (1) according to claim 1, characterized in that the second spring element (15) is arranged inside the friction surface section (11) in the radial direction (13).

7. A damper unit (1) according to claim 1, characterized in that the first spring element (8) is arranged outside the friction surface section (11) in the radial direction (13).

8. Damper unit (1) according to one of claims 1 to 7, characterized in that the damper unit (1) has a hub portion (25) for connection with a shaft (26), wherein the hub portion (25) has a rib (27) extending in the radial direction (13) and in the circumferential direction (9), wherein the rib (27) is arranged between two components of the damper unit (1) via a clamping connection (28).

9. A damper unit (1) as claimed in claim 8, wherein the hub portion comprises a sintered material.