CN218817862U

CN218817862U - Torque transmission device and drive device

Info

Publication number: CN218817862U
Application number: CN202221482926.5U
Authority: CN
Inventors: 克里斯托夫·拉贝尔
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2021-06-16
Filing date: 2022-06-14
Publication date: 2023-04-07
Anticipated expiration: 2032-06-14
Also published as: DE202022102269U1

Abstract

The present invention relates to a torque transmission device (1) comprising at least a damping device (2) for damping torsional vibrations and a torque limiting device (3) coupled with the damping device (2) for limiting a torque transmitted via the torque transmission device (1), having a common axis of rotation (4); wherein the damping device (2) has a first input side (5) and a first output side (6) which are rotatable relative to one another in a circumferential direction (8) over a limited angular range (9) via at least one first spring (7); the torque limiting device (3) has a second input side coupled to the first output side and a second output side connected to the second input side via a friction clutch, wherein the friction clutch is prestressed via at least one second spring, wherein a torque introduced into the torque transmission device via the first input side can be transmitted to the second output side and can be limited to a first limit torque.

Description

Torque transmission device and drive device

Technical Field

The utility model relates to a moment of torsion transmission device and drive arrangement.

Background

From the prior art, various drives are known which have a torque transmission device.

In the known drive device, it is required: in particular, the electrical components of the drive are protected against excessive torques and sudden torque changes. Such torque overshoot and/or sudden torque changes occur in particular in the following cases: in other words, motor vehicles equipped with a drive device are driven, for example, on uneven ground, wherein the individual wheels of the motor vehicle sometimes lose their frictionally engaged contact with the ground or slip or accelerate to a great extent.

Known torque transmission devices in the drive are correspondingly combined with torque limiting devices in order to meet the object of preventing excessive torque. In addition, the torque transmission device usually comprises a torsional vibration damper for protecting the connected components against occurring torsional vibrations, for example, which occur during operation of the connected internal combustion engine.

Friction-fit torque limiting devices are known. In this solution, a friction pair consisting of an organic lining is typically pressed onto a steel mating friction disc. The required pressing force is typically generated via a (disk) spring. In principle, an automatically actuated/torque actuated friction clutch or a slip clutch.

WO 2019/052603 A1, WO 2019/052602 A1, DE 10 2019 119 826 A1 and later published DE 10 2019 135 036.0, respectively, describe an apparatus for absorbing torque fluctuations, comprising a torque limiting device and a torsional vibration damper, wherein the torque limiting device is configured as a slip clutch.

According to DE 10 2019 135 036.0, the output of the drive assembly is coupled to the input side of the torsional vibration damper. The first output side of the torsional vibration damper is coupled to the second input side of the torsional vibration limiting device. The second output side of the torque limiting device is coupled to a hub via which a possibly limited torque can be transmitted to at least one wheel or the transmission. The torsional vibration damper and the torque limiting device are thus connected in series.

The torque limiting device is designed such that its second input side and second output side are connected to one another in a friction-fitting manner in order to transmit torque in a defined torque range. When the torque range is exceeded, i.e. when the switching threshold or the limit torque is reached, the frictional connection between the second sides is released and the torque transmission path between the second input side and the second output side of the torque limiting device is disconnected.

Maintaining the torque range must currently be achieved with great effort and is generally not maintained over the entire service life.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention is based on the object of providing a torque transmission device and a drive device provided therewith, by means of which fluctuations in the switching threshold value or the limiting torque can be kept as small as possible.

The object is achieved by means of a torque transmission device according to the invention. Further advantageous embodiments of the invention are given below. The features listed individually below can be combined with one another in a technically meaningful manner and can define further embodiments of the invention. The features specified in the claims are furthermore specified and explained in the description, in which further advantageous embodiments of the invention are shown.

A torque transmission device is proposed, which comprises at least a damping device for damping torsional vibrations and a torque limiting device coupled to the damping device for limiting a torque transmitted via the torque transmission device, the damping device and the torque limiting device having a common rotational axis. The vibration damping device has a first input side and a first output side which are rotatable relative to one another in a circumferential direction over a limited angular range via at least one first spring. The torque limiting device has a second input side coupled to the first input side and a second output side connected to the second input side via a friction clutch. The friction clutch is prestressed by means of at least one second spring. The torque introduced into the torque transmission device via the first input side can be transmitted toward the second output side and can be limited to a first limit torque. The first input side and the second input side are connected via a circumferential ramp system such that, when the first side is rotated relative to one another by a first angle value, a first ramp connected to the first input side can be rotated away from an initial position relative to a second ramp connected to the second input side. Due to the relative rotation of the ramps, the at least one second spring is operable such that the pretension of the friction clutch can be reduced.

The individual components of the damping device and the torque limiting device and their relative arrangement in the torque transmission device are known in principle. In the known torque transmission device, when a predefined limit torque is reached, the clutch begins to slip, i.e. the torque introduced into the torque transmission device is no longer or no longer completely transmitted to the second output side. The limit torque at which a slip of the torque limiting device or the friction clutch occurs is determined by a plurality of influencing variables. The sliding moment is, for example, proportionally related to the coefficient of friction in the frictional contact and the pressing force exerted by the second spring. The pressing force varies in particular as a function of the tolerances of the second spring and the adjoining component. The friction coefficient changes, for example, with respect to temperature and with respect to service life. These and other influences cause a significant change in the slip torque of the torque limiting device and thus a change in the limit torque.

The damping devices used in torque transmission devices generally have a defined characteristic curve relating to the torque with respect to the angle of rotation. The characteristic curve is relatively robust and only suffers from small fluctuations.

In this context, the situation is utilized. The torque applied at the torque transmission device can be inferred from the angle of rotation of the vibration damping device. The damping device is used herein as a torque sensor. When a defined angle of rotation, i.e. a first angle value and thus a defined torque, is reached, the frictional contact of the torque limiting device is mechanically broken or the contact pressure of the second spring and thus the pretensioning force of the friction clutch is reduced. In this case, it can therefore be provided that the second spring is not actuated until the first angle value is reached, so that the pretensioning force is not reduced.

Mechanically operating the friction clutch enables slipping of the friction pairs of the friction clutch so as to limit the torque transmittable by the torque transmission device to a predefined limit torque.

In this context, it is therefore proposed that a preloaded clutch is not expected to slip as a result of exceeding a limit torque. For this purpose, a ramp system is proposed, which is operated in connection with a relative rotation of the first sides relative to one another. The frictional contact of the torque limiting device is mechanically broken due to the operation of the ramp system.

The operation of the ramp system is in particular only carried out when the relative rotation of the first side exceeds a first angle value. No operation of the ramp system has previously been performed. The sensitivity of the ramp device can be set, for example, via the ramp slope and/or the second spring. Rotation beyond the first angle value causes a reduction in the pretension of the friction clutch.

The friction clutch is in particular designed such that it can transmit the torque introduced into the torque transmission device in any case in the pretensioned state. The limit of the transmittable torque is set in particular only via the damping device (and via a ramp system operated in connection therewith). The friction clutch is preferably therefore designed as a slip clutch which can be disengaged from the damping device in a torque-dependent manner (and which can also be engaged again, preferably again if the set torque is again lower).

The ramp system has, in particular, a plurality of first ramps and a plurality of second ramps. Between each pair of ramps, i.e. one first ramp and one second ramp, in particular a ball is arranged. The first ramp and the second ramp are arranged in particular distributed uniformly in the circumferential direction.

In particular, the ramp system has at least a first ramp, a second ramp and a ball arranged therebetween, wherein at least one ramp is movable along an axis of rotation via a relative rotation of the ramps in the circumferential direction. Relative rotation of the first side, when a first angle value is reached, causes relative rotation of the ramps with respect to the circumferential direction and thus movement of one of the ramps along the axis of rotation.

In particular, the first ramp is movable along the axis of rotation relative to the sides (i.e. in particular relative to the first input side, the first output side, the second input side and the second output side, which are all arranged substantially positionally fixed relative to the axis of rotation).

In particular, via the first ramp, the pressure plate of the friction clutch can be moved along the axis of rotation toward the at least one second spring, which generates the pretension. The platen is a component movable along an axis of rotation. The friction lining connected in a rotationally fixed manner to the output side of the friction clutch can be pressed between a pressure plate connected in a rotationally fixed manner to the input side of the friction clutch and movable along the axis of rotation and a counter-pressure plate connected in a rotationally fixed manner to the input side and fixed in position relative to the axis of rotation.

In particular, the friction clutch is a multiplate clutch having a plurality of outer friction plates connected to an outer friction plate carrier and a plurality of inner friction plates connected to an inner friction plate carrier, wherein a second ramp is provided at a second input side which is designed as an outer friction plate carrier. The friction linings can be pressed against one another via a pressure plate which is movable along the axis of rotation. The friction clutch is preferably designed as a multi-disk slip clutch, which can be disengaged by the damping device in terms of torque (and can also preferably be closed again if the set torque is again lower).

In particular, the first ramp is arranged at a ring element, which is connected to the first input side via a positive fit acting in the circumferential direction. The form fit is applied or engaged only after the first angle value is reached. Before the form fit is reached, the ring element and the first input side are thus substantially freely rotatable relative to each other.

The annular element is arranged in particular on the outer circumferential surface of the outer disk carrier.

In particular, below a second limit torque, the first ramp can be pivoted back toward the starting position by means of at least one second spring. In particular, the ramp system therefore does not act in a self-locking manner, but rather automatically pivots back into the starting position below a second limit torque, which is in particular smaller than the first limit torque.

In particular, the at least one second spring is a disk spring.

In particular, the pretensioning force of the friction clutch can be reduced by the relative rotation of the ramps not only during the traction mode of the torque transmission device but also during freewheeling. The torque transmission device should therefore act in particular in both circumferential directions with respect to the rotation of the first side. In this case, the set limit torque and/or the first angle value and/or the ramp slope can be set completely differently.

Furthermore, a drive device is proposed, comprising a drive assembly and the described torque transmission device. An output of the drive assembly, for example a crankshaft, is coupled to a first input side of a damping device of the torque transmission device in order to transmit the torque of the drive assembly to the torque transmission device.

The second output side comprises, in particular, a hub part, which is connected in a rotationally fixed manner, for example, to the transmission input.

Furthermore, a motor vehicle is proposed, comprising at least the described drive device having a transmission input shaft and a transmission, wherein the second output side comprises in particular a hub part, which is connected to the transmission input shaft in a rotationally fixed manner.

The use of the indefinite articles "a" and "an" in particular in the claims and in the specification reciting such claims is intended to be understood as indefinite articles such as, for example, and not as a word of art. It is therefore to be understood that, in accordance with the terms or components introduced thereby, they are present at least once and in particular, but also several times.

It is to be noted prophylactically that the terms "first", "second" and "first" are used herein in particular (only) to distinguish a plurality of similar objects, sizes or processes, i.e. the relevance and/or order of the objects, sizes or processes is not in particular mandatory. If dependencies and/or sequences are required, this is explicitly given here or will be obvious to the person skilled in the art when studying the specifically described design. As long as a member can appear multiple times ("at least one"), the description of one of the members may equally apply to all or a portion or a plurality of the members, but this is not mandatory.

Drawings

The invention and the technical field are explained in detail below with reference to the attached 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 and combine sub-aspects of the facts set forth in the drawings with other components and knowledge in the present specification, as long as they are not explicitly shown otherwise. It should be noted in particular that the figures and the particularly shown size relationships are merely schematic. The figures show:

FIG. 1 illustrates a side view in cross-section of a known torque transmitting device;

FIG. 2 illustrates a first perspective view of a cross-section of the torque transmitting device;

FIG. 3 illustrates a second perspective view of a cross-section of the torque transmitting device according to FIG. 2;

FIG. 4 shows a side view in cross-section of a portion of the torque transmitting device according to FIGS. 2 and 3;

FIG. 5 shows a first perspective view in section of a portion of the torque transmitting device according to FIG. 4;

fig. 6 shows a second perspective view of a section through a part of the torque transmission device according to fig. 4 and 5.

Detailed Description

Fig. 1 shows a sectional side view of a known torque transmission device 1. The torque transmission device 1 comprises a damping device 2 for damping torsional vibrations and a torque limiting device 3 coupled to the damping device 2 for limiting a torque transmittable via the torque transmission device 1, the damping device and the torque limiting device having a common rotational axis 4. The vibration damping device 2 has a first input side 5 and a first output side 6, which are rotatable relative to one another in a circumferential direction 8 over a limited angular range 9 via at least one first spring 7. The torque limiting device 3 has a second input side 10 coupled to the first output side 6 and a second output side 12 connected to the second input side 10 via a friction clutch 11. The friction clutch 11 is prestressed by a second spring 13. The torque introduced into the torque transmission device 1 via the first input side 5 can be transmitted toward the second output side 12 and can be limited to a first limit torque.

The arrangement of the torque transmission device 1 in the drive device 26 is shown. The drive device 26 comprises a drive assembly 27 and the torque transmission device 1. The output 28 of the drive assembly 27 is coupled to the first input side 5 of the vibration damping device 2 of the torque transmission device 1 in order to transmit the torque of the drive assembly 27 to the torque transmission device 1. The second output side 12 comprises a hub portion 29.

In the known torque transmission device 1, when a predefined limit torque is reached, the friction clutch 11 begins to slip, i.e. the torque introduced into the torque transmission device 1 is no longer transmitted or is no longer completely transmitted to the second output side 12. The limit torque at which the torque limiting device 3 or the friction clutch 11 slips is determined from a plurality of influencing variables. The sliding moment is, for example, proportionally related to the coefficient of friction in the frictional contact and the pressing force exerted by the second spring 13. The pressing force varies in particular as a function of the tolerances of the second spring 13 and the adjoining components. The friction coefficient changes, for example, with respect to temperature and with respect to service life. These and other influences cause a significant change in the slip moment of the torque limiting device 3 and thus a change in the limit torque.

Fig. 2 shows a first perspective view of a section through the torque transmission device 1. Fig. 3 shows a second perspective view of the torque transmission device 1 according to fig. 2 in section. Fig. 4 shows a side view in section of a part of the torque transmission device 1 according to fig. 2 and 3. Fig. 5 shows a first perspective view of a section through the torque transmission device 1 according to fig. 4. Fig. 6 shows a second perspective view of a section through a part of the torque transmission device 1 according to fig. 4 and 5. Fig. 2 to 6 are collectively described hereinafter. Reference is made to the embodiment of fig. 1.

The torque transmission device 1 comprises a damping device 2 for damping torsional vibrations and a torque limiting device 3 coupled to the damping device 2 for limiting the torque transmitted via the torque transmission device 1, the damping device and the torque limiting device having a common rotational axis 4. The vibration damping device 2 has a first input side 5 and a first output side 6, which are rotatable relative to one another in a circumferential direction 8 over a limited angular range 9 via at least one first spring 7. The torque limiting device 3 has a second input side 10 coupled to the first output side 6 and a second output side 12 connected to the second input side 10 via a friction clutch 11. The friction clutch 11 is prestressed by a second spring 13. The torque introduced into the torque transmission device 1 via the first input side 5 can be transmitted toward the second output side 12 and can be limited to a first limit torque. The first input side 5 is connected to the second input side 10 via a ramp system 14 which is rotatable in the circumferential direction 8, such that a first ramp 16 connected to the first input side 5 can be rotated out of an initial position 17 relative to a second ramp 18 connected to the second input side 10 when the

first sides

5,6 are rotated relative to one another by a first angle value 15. Due to the relative rotation of the

ramps

16, 18, the at least one second spring 13 is actuated so that the preload of the friction clutch 11 is reduced.

The torque applied at the torque transmission device 1 can be inferred from the angle of rotation of the vibration damping device 2. The damping device 2 serves here as a torque sensor. When a defined angle of rotation, i.e. a first angle value 15 and thus a defined torque, is reached, the frictional contact of the torque limiting device 13 is mechanically broken or the contact pressure of the second spring 13 is reduced and the pretensioning force of the friction clutch 11 is reduced. The mechanical operation of the friction clutch 11 enables slipping of the friction pairs (friction plates 22, 24) of the friction clutch 11 so that the torque transmittable by the torque transmission device 1 is limited to a predefined limit torque.

It is therefore proposed in this context that the preloaded friction clutch 11 is not expected to slip as a result of exceeding the limit torque. For this purpose, a ramp system 14 is proposed, which is operated in connection with the relative rotation of the

first sides

5,6 with respect to each other. The frictional contact of the torque limiting device 3 is mechanically broken due to the operation of the ramp system 14.

The operation of the ramp system 14 is only performed when the relative rotation of the

first sides

5,6 exceeds a first angle value 15. No operation of the ramp system 14 has previously been performed. The sensitivity of the ramp system 14 can be set, for example, via the ramp slope and/or the second spring 13. A rotation beyond the first angle value 15 causes a reduction in the pretensioning force of the friction clutch 11.

The ramp system 14 has a plurality of primary ramps 16 and a plurality of secondary ramps 18. A ball 19 is arranged between each pair of

ramps

16, 18, i.e. one first ramp 16 and one second ramp 18 each. The first ramps 16 and the second ramps 18 are each arranged uniformly distributed along the circumferential direction 8.

The first ramp 16 is movable along the axis of rotation 4 via relative rotation of the

ramps

16, 18 in the circumferential direction 8. The relative rotation of the

first sides

5,6, when the first angle value 15 is reached, causes a relative rotation of the

ramps

16, 18 with respect to the circumferential direction 8 and thus a displacement of the

first ramps

16, 18 along the axis of rotation 4.

The first ramp 16 is movable along the axis of rotation 4 relative to the

sides

5,6, 10, 12.

Via the first ramp 16, the pressure plate 20 of the friction clutch 11 can be moved along the axis of rotation 4 toward the at least one second spring 13, which generates the preload force. The platen 20 is a member movable along the rotation axis 4. Between a pressure plate 20, which is connected to the input side (second input side 10) of the friction clutch 11 in a rotationally fixed manner and is movable along the axis of rotation 4, and a counter-pressure plate 30, which is connected to the input side (second input side 10) in a rotationally fixed manner and is fixed in position relative to the axis of rotation 4, a friction lining (inner friction plate 24), which is connected to the output side (second output side 12) of the friction clutch 11 in a rotationally fixed manner, can be pressed.

The friction clutch 11 is a multiplate clutch having a plurality of outer friction plates 22 connected to an outer friction plate carrier 21 and a plurality of inner friction plates 24 connected to an inner friction plate carrier 23, wherein a second ramp 18 is provided on the second input side 10, which is formed as the outer friction plate carrier 21. The friction linings 22, 24 are pressed between a pressure plate 20 which is movable along the axis of rotation 4 and a counter-pressure plate 30. The inner disk carrier 23 is designed as a hub 29.

The first ramp 16 is arranged at a ring element 31, which is connected to the first input side 5 via a positive fit 25 acting in the circumferential direction 8. The form fit 25 is applied or engaged only after the first angle value 15 has been reached. Before reaching the form-fitting 25, the ring element 31 and the first input side 5 can therefore essentially rotate freely relative to one another.

The annular element 31 is arranged at an outer circumferential surface 32 of the outer friction plate carrier 21.

Below the second limit torque, the first ramp 16 can be rotated back toward the starting position 17 by means of the at least one second spring 13. The ramp system 14 should therefore not act in a self-locking manner, but rather automatically rotate back into the starting position 17 below a second limit torque, which is in particular smaller than the first limit torque.

The at least one second spring 13 comprises two disc springs.

List of reference numbers:

1. torque transmission device

2. Vibration damping device

3. Torque limiting device

4. Axis of rotation

5. First input side

6. First output side

7. First spring

8. In the circumferential direction

9. Angular range

10 second input side

11 Friction clutch

12 second output side

13 second spring

14 ramp system

15 first angle value

16 first slope

17 initial position

18 second slope

19 ball

20 pressing plate

21 outer friction lining carrier

22 outer friction plate

23 inner friction lining carrier

24 inner friction plate

25 form fitting part

26 driving device

27 drive assembly

28 output terminal

29 hub portion

30 back pressure plate

31 annular element

32 outer ring circumference.

Claims

1. A torque transmission device (1) comprising at least a damping device (2) for damping torsional vibrations and a torque limiting device (3) coupled with the damping device (2) for limiting a torque transmitted via the torque transmission device (1), the damping device and the torque limiting device having a common axis of rotation (4); characterized in that the damping device (2) has a first input side (5) and a first output side (6) which are rotatable relative to one another in a circumferential direction (8) over a limited angular range (9) by means of at least one first spring (7); wherein the torque limiting device (3) has a second input side (10) coupled to the first output side (6) and a second output side (12) connected to the second input side (10) via a friction clutch (11), wherein the friction clutch (11) is prestressed via at least one second spring (13); wherein a torque introduced into the torque transmission device (1) via the first input side (5) can be transmitted towards the second output side (12) and can be limited to a first limit torque; wherein the first input side (5) is connected to the second input side (10) via a ramp system (14) which is rotatable in the circumferential direction (8) in such a way that, when the first side (5,6) is rotated relative to a first angle value (15), a first ramp (16) which is connected to the first input side (5) can be rotated relative to a second ramp (18) which is connected to the second input side (10) out of an initial position (17), wherein, as a result of the relative rotation of the ramps (16, 18), the at least one second spring (13) is actuated such that the pretension of the friction clutch (11) can be reduced.

2. Torque transmitting device (1) according to claim 1,

wherein the ramp system (14) has at least the first ramp (16), the second ramp (18) and a ball (19) arranged between the first and the second ramp, wherein at least one ramp (16, 18) is movable along the axis of rotation (4) via a relative rotation of the ramps (16, 18) in the circumferential direction (8).

3. Torque transmitting device (1) according to claim 2,

wherein the first ramp (16) is movable along the axis of rotation (4) relative to the side (5,6, 10, 12).

4. Torque transmitting device (1) according to claim 3,

wherein, via the first ramp (16), a pressure plate (20) of the friction clutch (11) can be moved along the rotational axis (4) toward the at least one second spring (13) generating the pretension.

5. Torque transmitting device (1) according to claim 1,

wherein the friction clutch (11) is a multiplate clutch having a plurality of outer friction plates (22) connected to an outer friction plate carrier (21) and a plurality of inner friction plates (24) connected to an inner friction plate carrier (23), wherein the second ramp (18) is arranged on the second input side (10) designed as an outer friction plate carrier (21).

6. Torque transmitting device (1) according to any one of claims 1 to 5,

wherein the first ramp (16) is arranged at a ring element (31) which is connected to the first input side (5) via a form fit (25) acting in the circumferential direction (8), wherein the form fit (25) is active only after the first angle value (15) is reached.

7. Torque transmitting device (1) according to claim 6,

wherein below a second limit torque, the first ramp (16) can be pivoted back toward the starting position (17) by means of the at least one second spring (13).

8. Torque transmitting device (1) according to claim 1,

wherein the at least one second spring (13) is a disk spring.

9. Torque transmitting device (1) according to claim 1,

the preload of the friction clutch (11) can be reduced by relative rotation of the ramps (16, 18) both during traction operation and also during freewheeling of the torque transmission device (1).

10. A drive arrangement (26), characterized in that the drive arrangement (26) comprises a drive assembly (27) and a torque transmission device (1) according to any one of the preceding claims, wherein an output (28) of the drive assembly (27) is coupled with the first input side (5) of the damping device (2) of the torque transmission device (1) for transmitting torque from the drive assembly (27) to the torque transmission device (1).