CN218094058U

CN218094058U - Torque transmission device

Info

Publication number: CN218094058U
Application number: CN202090000828.6U
Authority: CN
Inventors: B.德利格尼尔斯
Original assignee: Valeo Embrayages SAS
Current assignee: Valeo Embrayages SAS
Priority date: 2019-08-30
Filing date: 2020-08-27
Publication date: 2022-12-20
Anticipated expiration: 2030-08-27
Also published as: FR3100297B1; JP2022545824A; JP7412539B2; FR3100297A1; DE112020004101T5; WO2021038005A1

Abstract

The present invention relates to a torque transmission device (1) for a motor vehicle, comprising a torque input element (2, 3, 4), a torque output element (6, 7, 8), an elastic member (91, 92) mounted between the torque input and output elements, and phasing members (10, 11, 12), the elastic members being arranged in series by the phasing members, the torque input element, the torque output element and/or the phasing members each comprising at least one abutment means (30, 26, 27, 37) for limiting the compression of the elastic member, each of the abutment means of the torque input element, the torque output element and the phasing members being configured such that, in case of excessive torque, torque is transmitted radially from a driving shaft to a driven shaft by the device below said elastic members.

Description

Torque transmission device

Technical Field

The present invention relates to the field of torque transfer devices for motor vehicles, such as Dual Mass Flywheels (DMF).

Background

Such devices typically include a torque input element, a torque output element, and a resilient member mounted between the torque input element and the torque output element and resisting rotation of one of the elements relative to the other.

When the torque transmitting device is of the LTD (Long Travel Damper) type, it comprises a plurality of sets of elastic members, wherein the elastic members of the same set are arranged in series by means of a phasing member, so that the elastic members of each set deform in phase with each other.

Patent application FR2995953 discloses a torque transmission device comprising a damper of the LTD type. In this type of damper, the elastic members are distributed in pairs of elastic members. A first elastic member of a given pair of elastic members is arranged between the torque input element and the phasing member, and then a second elastic member of the same pair of elastic members is arranged between the phasing member and the torque output element. The torque transmitting device is configured such that torque is transmitted from the torque input element to the torque output element by passing through the first elastic member, then the phasing member, and then the second elastic member.

The torque input element, the torque output element and the phasing member each have arms extending radially and supporting ends of the resilient member. Each elastic member is housed between two arms circumferentially consecutive to each other.

In order to improve the filtering performance, measures are taken to reduce the cross section of these same arms as much as possible, so as to be able to increase the size of the elastic member housed between the two arms.

In the case of excessive torque, that is to say when the engine torque reaches 6000 to 10000Nm, the torque short-circuits the elastic member, that is to say the torque is transmitted directly from the torque input element to the phasing member and then from the phasing member to the torque output element, while passing directly through the arms of reduced cross section.

However, due to the reduced size of the arms, a breaking point associated with such excessive torque is possible.

Thus, to avoid these fractures, the arms are made with a cross section wide enough to avoid any fracture, especially in the case of excessive torque. However, the larger the size of the arm, the more the size of the spring has to be reduced, which in turn reduces the performance of the torque transmission device, in particular with respect to damping.

SUMMERY OF THE UTILITY MODEL

An aspect of the present invention starts from the idea of solving the drawbacks of the prior art by proposing a torque-transmitting device that preserves a reduced cross-sectional area, allowing the insertion of an elastic member of the largest possible size.

In particular, the present invention allows to transmit torque radially under the elastic member in case of excessive torque. Therefore, in the case where the torque is excessively large, the torque is no longer transmitted horizontally through the weak region of the transmission device, but is transmitted through a region incapable of supporting the elastic member. To this end, the present invention provides an abutment device that is realized to allow a torque to be transmitted radially under the elastic member in case the torque is too large.

According to one embodiment, the present invention provides a torque transmitting device for a motor vehicle, comprising:

a torque input member connected to the drive shaft,

a torque output element connected to the driven shaft,

at least two resilient members mounted between the torque input element and the torque output element and resisting rotation of one of the torque input element and the torque output element, an

Phasing members via which the elastic members are arranged in series, such that the elastic members are deformed in phase with each other,

the torque input element, the torque output element and/or the phasing member each comprise at least one abutment means designed to limit the compression of the elastic member,

each of the abutting means of the torque input element, of the torque output element and of the phasing member is configured such that in the event of excessive torque, the torque is transmitted radially from the drive shaft to the driven shaft through the device under the elastic member.

In an embodiment, the abutment means of the phasing member comprise an upstream abutment element, which is able to cooperate with the torque input element, and a downstream abutment element, which is able to cooperate with the torque output element.

In an embodiment, the phasing member comprises an insert forming an abutment means of said phasing member.

In one embodiment, the insert is a symmetrical part. Thus, the first abutting element and the second abutting element are symmetrical.

In an embodiment, the insert is formed by a central part extending circumferentially radially inwards in two opposite directions to form the upstream and downstream abutment means.

In one embodiment, the insert is made of a sintered material.

In an embodiment, the density of the material adjacent the device is greater than the density of the material present in the remainder of the insert.

In particular, at one location where torque can be transmitted, the construction of the insert may be different compared to another location where no torque is received, as may the rest of the insert.

In an embodiment, the first elastic member is mounted between the torque input element and the phasing member, the second elastic member is mounted between the phasing member and the torque output element, the insert also forming a support part for one of the ends of the first elastic member and for one of the ends of the second elastic member.

Advantageously, the reduced portion of the phasing member can be easily modified without having to modify the phasing member as a whole.

In particular, the insert also forms an element that can be easily manufactured to take into account the various roles it will have to play. The insert acts as a seat but may also act as a means of retaining the resilient member. Thus, the composition of the insert may be different in a first position intended to form the seat with respect to another position intended to retain the relative elastic member.

In an embodiment, the phasing member is formed by two washers rotationally connected to each other, the torque output element being mounted between the two washers and forming at least one protrusion capable of cooperating with an abutting means of the phasing member.

In a preferred example, the two washers are identical.

In one embodiment, each washer forms a first radial arm from the outer radial periphery, the torque output element forms a disc having a second radial arm extending at the outer radial periphery of the disc, the second resilient member is mounted between the first and second arms, and the protrusion is formed on the outer radial periphery of the disc.

In an embodiment, the torque input element forms at least one plate having at least one window able to receive the elastic member, said window having an inner peripheral edge radially between the elastic member and the axis X, having a projection able to bear against the abutment means of the phasing member, and a lateral surface able to support one end of the elastic member.

In an embodiment, the torque input element is formed by two plates connected in rotation and arranged on either side of the phasing member.

In an embodiment, the phasing member is formed by two washers which are rotationally connected, the first abutment element and the second abutment element each forming a strip which extends axially beyond the two washers of the phasing member, so that in case of excessive torque at least one of the two strips can be brought into contact with the abutment means of the torque input element.

According to an embodiment of the invention, each washer has a circular planar surface with an outer radial periphery from which a first radial arm extends, a cavity being formed from the outer radial periphery in the vicinity of the first arm, the cavity being configured to receive the strip such that an upper surface of the strip is aligned with or slightly higher than the outer radial periphery of the respective washer.

According to an embodiment of the invention, the elastic member is a coil spring.

Drawings

The invention will be better understood and other objects, details, characteristics and advantages thereof will become more apparent from the following description of several particular embodiments of the invention, given by way of non-limiting illustration only, with reference to the accompanying drawings.

Figure 1 is an exploded perspective view of a torque transmitting device according to an embodiment of the present invention,

FIG. 2 is a front view of the torque transmitting device according to FIG. 1, an

Fig. 3 is a perspective view of an insert of the torque transmitting device according to fig. 1.

Detailed Description

Unless otherwise specified, "axial" means "parallel to the axis of rotation X of the device"; "radial" means "along a transverse axis that intersects the axis of rotation of the device"; "angularly" or "circumferentially" means "about the axis of rotation of the device".

Fig. 1 shows an overall perspective view of a torque transmission device 1 according to an embodiment of the present invention. More specifically, such a torque transfer device 1 forms a dual mass flywheel or DMF. Such a torque transmitting device 1 includes a torque input member 2 connectable to a crankshaft (not shown). The torque input element 2 forms a primary flywheel comprising two plates 3 and 4 which are rotationally connected to each other by connecting means (not shown), such as rivets. The first plate 3 near the engine side is connected to the starter ring gear 5. The second plate 4 is placed opposite the first plate 3.

The torque transmitting device 1 further comprises a torque output element 6, the torque output element 6 being formed by a disc 7 (or web) and a secondary flywheel 8 which are rotationally connected to each other. The torque output member is connectable to a gearbox input shaft (not shown).

Such as 9 ₁ 、9 ₂ Is positioned between the torque input element 2 and the torque output element 6.

These elastic members 9 ₁ 、9 ₂ Are the same here but may differ from each other in another example. Where they form a helical spring.

The transfer device 1 further comprises a pad comprising two padsPhasing members 10 of the

rings

11 and 12. In this non-limiting example, the two

washers

11 and 12 are identical and are connected rotationally with respect to each other by connecting means, for example a rivet 13. The phasing member 10 is mounted in a floating manner. In particular, it is arranged to be inserted between two elastic members 9 ₁ 、9 ₂ While being rotationally movable relative to the torque input member 2 and relative to the torque output member 6.

Each elastic member 9 ₁ 、9 ₂ Intended to be in contact with the phasing member 10. In particular, each

washer

11 and 12 comprises at least one arm 14 forming an extension of material radially extending in a direction opposite to the rotation axis X. In the example of fig. 1, each

washer

11 and 12 comprises three arms, such as 14, which are regularly distributed at an angle. The

washers

11 and 12 are arranged with their respective arms overlapping each other.

Elastic member 9 ₁ 、9 ₂ Organized into pairs of upstream and downstream elastic members. In particular, the upstream elastic member 9 ₁ And a downstream elastic member 9 ₂ Arranged on either side of each arm 14 of the phasing member 10. The upstream elastic member refers to an elastic member that can be placed in contact with the torque input element. The downstream elastic member refers to an elastic member that can be placed in contact with the torque output element.

Each upstream elastic member 9 ₁ Having a first end 15 and a second end 17. The first end 15 is intended to be in contact with the arm 14 of the phasing washer 10. The second end 17 is intended to be in contact with the torque input element 2.

Each downstream elastic member 9 ₂ Having a third end 16 and a fourth end 18. The third end 16 is intended to be in contact with the arm 14 of each of the

washers

11 and 12 of the phasing member 10. The fourth end 18 is intended to be in contact with the torque output element 6, in particular here via the disk 7.

The phasing member 10 comprises an insert 19 arranged on at least one arm 14 of one of the

washers

11, 12. According to this embodiment, the insert 19 is formed in one piece, but may be formed from multiple pieces or made in one piece with the arm 14. In this embodiment, the insert 19 is arranged axially between the two

washers

11 and 12. More precisely, the insert 19 is positioned rotationally fixed between the two arms 14.

The insert 19 forms a central part 23 delimiting an upstream 20 and a downstream 21 lateral support surface, said upstream 20 and downstream 21 lateral support surfaces being able to receive the upstream elastic member 9, respectively ₁ First end portion 15 and downstream elastic member 9 ₂ And a third end 16. Each of these lateral support surfaces 20 and 21 has a guide post, such as 22, around which the end of the respective elastic member is inserted. These lateral bearing surfaces 20 and 21 each extend in a plane inclined with respect to a plane perpendicularly intersecting the rotation axis X and perpendicularly intersecting the plane in which the arm 14 extends. These lateral bearing surfaces 20 and 21 extend while covering the cross section formed by the two

washers

11 and 12.

The central part 23 extends circumferentially radially outwards in two opposite directions to form a first extension 24 and a second extension 25. The first extension 24 and the second extension 25 extend radially above the arm 14. The first extension 24 is for holding the upstream elastic member 9 ₁ The second extension 25 is used for holding the downstream elastic member 9 ₂ And a third end portion 16. In this example, the first and

second extensions

24 and 25 extend beyond the radial outer periphery of each

washer

11 and 12.

The central part 23 also extends circumferentially radially inwards in two opposite directions to form an upstream abutment means 26 and a downstream abutment means 27. The upstream abutment means 26 and the downstream abutment means 27 also extend to cover the other cross section of the two

gaskets

11 and 12. The upstream abutment means 26 is designed to be able to come into contact with the torque input element 2 in the event of excessive torque. Thus, more precisely, the upstream abutment means 26 extends axially at least beyond the cross section of the washer intended to be closest to the torque input element. In this example, since the torque input element is formed by the first plate 3 and the second plate 4, it is sufficient that the upstream abutment means 26 extends beyond the cross section of the first plate 3 or of the respective second plate 4.

In the preferred example, the insert 19 is a symmetrical part, which means that the upstream abutment means 26 and the downstream abutment means 27 extend in the same way with respect to the central axis of symmetry Y in fig. 3. A cross-section refers to a section taken along a plane that intersects a component along a plane that is perpendicular to the plane in which the component extends.

In the example of the invention, the upstream abutment means 26 and the downstream abutment means 27 extend axially, covering both

gaskets

11 and 12.

In this example, the two

gaskets

11 and 12 have a local recess 36 to receive the upstream abutment device 26. The recess 36 is made radially inward so that the upstream abutment means 26 is flush with the outer periphery 38 of the gasket. Therefore, the mounting diameter of the elastic member is not affected, and can be optimized to reduce the size of such a device.

Each plate 3 and 4 forms a window 28, each of which accommodates an upstream elastic member 9 ₁ And a downstream elastic member 9 ₂ . In this example, each plate forms three windows such as 28, which are regularly angularly distributed.

Each window 28 forms a radially inner edge 29 delimiting a fourth abutment means 30 against which the upstream abutment means 26 can come into contact. The fourth abutment means 30 forms a shoulder. Each window 28 also defines an upstream lateral bearing surface 31 and a downstream lateral bearing surface 32. The upstream lateral surface 31 serves as the upstream elastic member 9 ₁ The support portion of (1).

Shoulder 30 and upstream abutment means 26 of phasing member 10 are separated by a distance d (not shown) measured circumferentially between shoulder 30 and upstream abutment means 26, which distance lies in correspondence of upstream elastic member 9 ₁ And a distance d1 (not shown) corresponding to an excessive torque or maximum allowable torque condition before the device abuts. According to the present invention, in such an excessive torque state or maximum allowable torque state, the upstream elastic member 9 ₁ With discontinuous turns.

The web 7 has a structure similar to the

washers

11 and 12. In particular, the web has three radial extensions 33 regularly distributed at an angle, each having an upstream lateral bearing surface 34 and a downstream lateral bearing surface 35. The downstream lateral bearing surface 35 serving as a lower partElastic component 9 ₂ The support portion of (1).

The web 7 forms a flat disc having an outer radial periphery 36 extending in a first circle centred on X, from which three radial extensions 33 extend. At least one protrusion, such as 37, is formed from the outer radial periphery 36, particularly proximate the location where one of the radial extensions 33 is formed. According to the example shown, three projections such as 37 are formed, each close to a respective radial extension 33.

The protrusion 37 and the downstream abutment means 27 of the phasing member 10 are separated from each other by a distance D, measured in the circumferential direction between the protrusion 37 and the downstream abutment means 27, included in correspondence with the downstream elastic member 9 ₂ And a distance D1 corresponding to an excessive torque condition of the device, and a distance D2. The distance D2 is obtained such that the downstream elastic member 9 ₂ Is discontinuous.

In operation, engine torque is transmitted from the plates 3 and 4 to each upstream resilient member 9 ₁ Then through each radial arm 14 of each

washer

11 and 12 and then through each downstream elastic member 9 ₂ And then through the web 7.

In the event of excessive torque, engine torque passes directly through the

mounts

30, 26, 27, 37, shorting the passages through the respective arms of the device. Since the

respective abutments

30, 26, 27, 37 are located in the resilient member 9 ₁ 、 9 ₂ Radially inside, the arms are not stressed and excessive torque does not risk damaging them.

Claims

1. A torque transmission device (1) for a motor vehicle, comprising:

a torque input element (2, 3, 4) connected to the drive shaft,

a torque output element (6, 7, 8) connected to the driven shaft,

at least two elastic members (9) ₁ 、9 ₂ ) Said at least two resilient members being mounted between said torque input element and said torque output element and resisting rotation of one of said torque input element and said torque output element, an

Phasing members (10, 11, 12) via which the elastic members are arranged in series, such that the elastic members are deformed in phase with each other,

said torque input element, said torque output element and/or said phasing member each comprising at least one abutment means (30, 26, 27, 37) designed to limit the compression of an elastic member,

each abutment means of the torque input element, of the torque output element and of the phasing member is configured such that in the event of excessive torque, torque is transmitted radially from the drive shaft to the driven shaft through the device under the elastic member;

wherein the phasing member comprises an insert (19) forming an abutment means (26, 27) of the phasing member.

2. The device according to claim 1, wherein the abutment means of the phasing member comprise an upstream abutment element (26) and a downstream abutment element (27), the upstream abutment element (26) being able to cooperate with the torque input element and the downstream abutment element (27) being able to cooperate with the torque output element.

3. The device of claim 1, wherein the insert is a symmetrical part.

4. A device according to claim 3, wherein the insert is formed by a central part (23) extending circumferentially radially inwards in two opposite directions to form upstream abutment means (26) and downstream abutment means (27).

5. The apparatus of claim 1, wherein the insert is made of a sintered material.

6. The apparatus of claim 5, wherein the density of the material at the abutment device is greater than the density of the material present in the remainder of the insert.

7. The device according to claim 1, wherein the first elastic member (9) ₁ ) A second elastic member (9) mounted between said torque input element and said phasing member ₂ ) Mounted between the phasing member and the torque output element, the insert also forming a support part for one of the ends of the first elastic member and one of the ends of the second elastic member.

8. Device according to claim 1, wherein the phasing member is formed by two washers (11, 12) rotationally connected to each other, the torque output element being mounted between the two washers and forming at least one protrusion (37) able to cooperate with an abutment means of the phasing member.

9. The device of claim 8, wherein each washer forms a first radial arm (14) from an outer radial periphery, the torque output element forms a disc having a second radial arm (33), the second radial arm (33) extending at an outer radial periphery (36) of the disc, the second resilient member being mounted between the first and second arms, the protrusion being formed on the outer radial periphery of the disc.

10. Device according to claim 1, wherein said torque input element forms at least one plate (4, 5) having at least one window (28) able to receive an elastic member, said window having an inner peripheral edge (29) radially between the elastic member and the axis X and a lateral bearing surface (31) able to support one end of the elastic member, the inner peripheral edge having a projection (30) able to bear against abutment means of said phasing member.

11. The device according to claim 1, wherein the torque input element is formed by two plates (4, 5) connected in rotation and arranged on either side of the phasing member.

12. The device of claim 1, wherein the resilient member is a coil spring.