FR3105328A1 - Torque transmission device - Google Patents

Abstract

Disclosed is a torque transmission device (1) for a vehicle comprising: an input element (4), an output element (23), a damping device (5) comprising an input part ( 7) coupled in rotation to the input element and an output part (6) coupled in rotation to the output element, and at least one elastic member disposed between the input part and the output part, a first hysteresis device (9) disposed between the inlet part and the outlet part, a lubrication device (11) of the first hysteresis device comprising a lubrication channel (12) through which a lubricating fluid passes , and a cover (3) delimiting a space (25) containing the damping device, the cover being configured in such a way that it forms the lubrication channel, the lubrication channel being configured to open into the space . Figure to be published: 2

Description

Torque transmission device

The invention relates to a torque transmission device, in particular for a motor vehicle. The invention also relates to a clutch, in particular of the single, double or triple clutch type comprising such a torque transmission device.

Technology background

Torque transmission devices dampen the vibrations generated by the crankshaft of a vehicle engine. In particular, these devices comprise a vibration damping device formed by a torque input part and by a torque output part between which an elastic member is interposed. The oscillation between the torque input part and the torque output part makes it possible to dampen part of the vibrations generated by the motor. Nevertheless, this damping is not sufficient or is not effective if the oscillation at the start of rotation of the crankshaft is not limited.

Hysteresis devices are known formed by a first friction washer and by a second friction washer placed between the torque input part and the torque output part of the damping device. The first washer and the second washer are placed in abutment respectively against the torque input part and against the torque output part respectively and vice versa. This hysteresis device makes it possible to filter the vibrations from the start of the motor start-up. However, in certain circumstances, this amortization is not enough. Such a system generally has a constant hysteresis torque limiting the effectiveness of vibration damping.

Summary

An idea at the basis of the invention consists in proposing a torque transmission device aimed at solving the aforementioned problems by improving the ability to filter the vibrations generated by the engine of a vehicle.
To do this, the invention proposes a torque transmission device for a motor vehicle comprising:
a torque input element adapted to be connected to a crankshaft of an engine shaft,
a torque output element adapted to be connected to a gearbox,
a vibration damping device comprising an input part adapted to be coupled in rotation to the torque input element and a torque output part adapted to be coupled in rotation to the torque output element, and at least one elastic member arranged between the torque input part and the torque output part and around an axis X of rotation of the torque transmission device, acting against the rotation of one input and output parts with respect to each other,
a first hysteresis device arranged between the torque input part and the torque output part,
a device for lubricating the first hysteresis device comprising a lubrication channel through which a lubricating fluid passes, and
a cover defining a space containing the vibration damping device, the cover being configured in such a way that it forms the lubrication channel, the lubrication channel being configured to open into the space.

This hysteresis device according to the invention forms a variable hysteresis device, that is to say that thanks to the invention, it is possible to generate a damping of the vibrations capable of adapting more precisely to the fluctuations of the vibes.

According to other embodiments, the torque transmission device may comprise one or more of the characteristics described below.

According to one embodiment of the invention, the lubrication channel forms at least a first conduit.

According to one embodiment of the invention, the lubrication channel forms at least two first ducts, preferably evenly distributed around the axis X.

According to one embodiment of the invention, the torque transmission device also comprises a device for controlling the first hysteresis device which is formed by a piston and a control fluid supply channel, the piston being capable of come into contact with the first hysteresis device following the displacement of the control fluid present in the supply channel. The piston is able to come into contact with the first hysteresis device directly or indirectly.

The lubrication channel opens in such a way that the emerging fluid follows a path which is oriented in the direction of the hysteresis device. In particular, such a path must be obtained during the centrifugation which occurs when the motor is in operation.

The lubrication channel opens in such a way that the emerging fluid follows a path which can move towards the first hysteresis device during centrifugation. In particular, such a path is obtained during the centrifugation which occurs when the motor is in operation. By the centrifugation effect, the fluid passes through the packings and allows them to cool. Linings means friction discs and/or counter-discs.

The fluid emerges in a place which is in a diameter which is less than another diameter crossed by the first hysteresis device.

In one embodiment, the cover has a thickness E measured along an axis parallel to the axis X, this thickness E being configured in such a way that the lubrication channel can be formed therein.

The lubrication channel extends through the thickness E of the cover in such a way as to emerge radially inward into the space. In one example, the lubrication channel extends substantially radially towards the X axis of rotation.

According to one embodiment of the invention, the cover is configured in such a way that it forms the supply channel, the supply channel and the lubrication channel each forming a circuit independent of one another. other.

According to one embodiment of the invention, the fluid supply channel forms at least a second conduit.

According to one embodiment of the invention, the fluid supply channel forms at least two second ducts, preferably evenly distributed around the X axis.

According to one embodiment of the invention, the lubrication channel and the supply channel respectively have a first lubricating fluid outlet and a second supply fluid outlet, the first outlet emerging radially between the second outlet and the axis of rotation X of the transmission device.

According to one embodiment of the invention, the first ducts and the second ducts are arranged one after the other alternately circumferentially.

According to one embodiment of the invention, the first ducts are arranged axially offset from the second ducts.

According to one embodiment of the invention, the first ducts and the second ducts overlap with respect to each other.

According to one embodiment of the invention, the first hysteresis device comprises counter-discs connected to the torque input part or the torque output part of the damping device and friction discs (20) connected to the torque output part or to the torque input part respectively of the damping device, the counter-discs and the friction discs being capable of cooperating with each other.

According to one embodiment of the invention, the counter-discs are mounted on a first support and the friction discs are mounted on a second support, the first support and the second support being mounted fixed in rotation respectively on the part of input, or on the torque output part, and on the torque output part, or on the input part, of the damping device.

According to one embodiment of the invention, the counter-discs are mounted on a third support and the friction discs are mounted on a fourth support, the third support and the fourth support being formed respectively by the input part, or by the torque output part, and by the torque output part, or by the input part, of the damping device.

According to one embodiment of the invention, the torque transmission device comprises a second hysteresis device formed by a first friction washer and by a second friction washer pressing against each other, the first washer being placed in abutment against the torque input part and the second friction washer being placed in abutment against the torque output part of the damping device. This second hysteresis device provides friction which is not adjustable during operation of the torque transmission device, unlike that generated by the first hysteresis device according to the invention.

According to one embodiment of the invention, the torque transmission device also comprises a pendular device mounted fixed in rotation on the torque output element or on the torque input element.

The invention also relates to single clutches, double or triple clutches.
The invention also relates to a clutch of a motor vehicle comprising a torque transmission device as previously described.

Brief description of figures

. The invention will be better understood, and other aims, details, characteristics and advantages thereof will appear more clearly during the following description of several particular embodiments of the invention, given solely by way of illustration and not limitation. , with reference to the accompanying drawings.

Figure 1 or is a sectional view of a torque transmission device, according to one embodiment of the invention.

Figure 2 or is a sectional view of the torque transmission device from another angle seen from [Fig. 1].

In the description and the claims, the “axial” and “radial” orientations will be used to designate, according to the definitions given in the description, elements of the torque transmission device. By convention, the "radial" orientation is directed orthogonally to an axis X of rotation of the torque transmission device determining the "axial" orientation and, from the inside outward away from said axis, the "circumferential" orientation is directed orthogonally to the axis of the torque transmission device and orthogonal to the radial direction. The terms "external" and "internal" are used to define the relative position of one element with respect to another, with reference to the X axis of rotation of the torque transmission device, an element close to the axis is thus qualified as internal as opposed to an external element located radially on the periphery.

In relation to the and/or [fig.2], a clutch 30 of a motor vehicle is described below comprising a torque transmission device 1. This torque transmission device 1 comprises a torque input element 4 capable of being directly or indirectly connected to a crankshaft of an engine shaft (not shown) and a torque output element 23 adapted to be connected to a gearbox shaft (not shown). A vibration damping device 5 is positioned between the cutting input element 4 and the torque output element 23. The vibration damping device 5 comprises a torque input part 7 capable of being coupled in rotation to the torque input element 4 and a torque output part 6 adapted to be coupled in rotation to the torque output element 23. At least one elastic member (not shown) is disposed between the torque input part 7 and the torque output part 6, around an axis X of rotation of the torque transmission device 1. The elastic member acts against the rotation of one of the parts torque input 7 and torque output 6 with respect to each other.

A first hysteresis device 9 is also arranged between the torque input part 7 and the torque output part 6. In this example, this first hysteresis device 9 comprises counter-disks 19 connected to the torque output 6 of the damping device 5 and friction discs 20 connected to the torque input part 7 of the damping device 5. The counter-discs 19 and the friction discs 20 are arranged alternately one between the other .

In this example and/or [Fig.2], the counter-discs 19 are mounted on a first support 21 and the friction discs 20 are mounted on a second support 22. The first support 21 forms a part which is connected in rotation to the part torque input 7 and the second support 22 forms another part which is connected in rotation to the torque output part 6 of the damping device 5. Thus, the counter-discs 19 and the friction discs 20 are capable of cooperating with each other in such a way as to approach each other to create friction between the counter-discs 19 and the friction discs 20.

In this example, the first support 21 and the second support 22 each form a separate piece which can be in an L-shaped example. The first support 21 and the second support 22 are mounted fixed in rotation respectively on the input part torque 7 and on the torque output part 6 of the damping device 5.

In a variant not shown, the counter-discs 19 could be mounted on a third support (not shown) and the friction discs 20 could be mounted on a fourth support (not shown). The third support and the fourth support would be formed respectively by the torque input part and by the torque output part of the damping device 5. In other words, a first assembly formed by the input part of torque 7 and the third support on one side, and a second assembly formed by the torque output part 6 and the fourth support on the other side, would each form a single piece.

A lid 3 is also provided. Cover 3 is placed between the motor shaft and the gearbox shaft and forms a part that is fixed in rotation. Cover 3 is mounted free to rotate relative to torque input element 4 via a bearing 24 mounted between cover 3 and torque input element 4. Cover 3 is mounted fixed in rotation on a casing (not shown) of the gearbox. The cover 3 delimits a space 25 containing the vibration damping device 5. The cover 3 has a thickness E measured along an axis parallel to the axis X.

A lubrication device 11 of the first hysteresis device 9 is provided. This lubricating device 11 comprises a lubricating channel 12 through which a lubricating fluid passes.
This thickness E is configured in such a way that the lubrication channel 12 can be formed there. This lubrication channel 12 extends through the thickness E of the cover in such a way as to emerge radially inwards. in the space 25. In the example illustrated, the lubrication channel 12 extends substantially radially towards the axis X of rotation.

The lubrication channel 12 forms at least a first duct. In a preferred example, the lubrication channel 12 forms three first conduits (not visible in Figures 1 and 2). Preferably, the first three ducts are evenly distributed around the X axis. In this example, the first duct extends substantially radially with respect to the X axis.

and/or [Fig.2] The torque transmission device 1 also comprises a control device 10 of the first hysteresis device 9 which is formed by a piston 13 and a control fluid supply channel 14. The piston 13 is able to slide along walls delimited by a pocket 26. The pocket 26 is formed at one of the ends of the control fluid supply channel 14. The pocket 26 and the piston 13 are arranged one with respect to the other in such a way that the piston 13 can come into contact with the first hysteresis device 9 following the displacement of the control fluid present in the supply channel 14.

At one end opposite to pocket 26, piston 13 is fixed to a ring 31 capable of coming into contact with counter discs 19 or friction discs 20. This ring 31 has a first part 32 fixed in rotation to piston 13 and a second part 33 capable of coming directly or indirectly into contact with the counter discs 19 or the fictional discs 20. Between the first part 32 and the second part 33 is arranged a plurality of balls such as 34. Thus, the first part 32 and the second part 33 can rotate relative to each other when the torque input element 4 is set in motion.

The cover 3 is configured in such a way that it forms the supply channel 14. According to one embodiment of the invention, the supply channel 14 and the lubrication channel 12 each form an independent fluid circuit. each other.

The control fluid supply channel 14 forms at least a second conduit. In a preferred example, the control fluid supply channel 14 forms three second ducts (not visible on the and [Fig. 2]). Preferably, the three second ducts are evenly distributed around the X axis. In this example, the second duct extends substantially radially with respect to the X axis.

The lubrication channel 12 and the supply channel 14 respectively have a first outlet 17 for lubricating fluid and a second outlet 18 for supply fluid. According to this embodiment of the invention, the first outlet 17 emerges radially between the second outlet 18 and the axis of rotation X of the transmission device. The second supply fluid outlet 18 is plugged in a sealed manner by the piston 13.

In one example, the first ducts and the second ducts are arranged one after the other alternately circumferentially around the axis X of rotation. In one example, the first conduits are arranged axially offset relative to the second conduits, while overlapping relative to each other.

The lubrication channel 12 opens into the space 25 in such a way that the emerging fluid follows a path which can be oriented in the direction of the first hysteresis device 9 during centrifugation. In particular, such a path is obtained when the engine is in operation. Through the centrifugation effect, the fluid then passes through the friction discs and counter-discs and allows them to cool.

The fluid emerging from the lubrication channel 12 is oriented in a place which is in a diameter which is less than another diameter crossed by the first hysteresis device 9.

The torque transmission device 1 also comprises a second hysteresis device 27. This second hysteresis device 27 provides friction which is not adjustable during operation of the torque transmission device 1 unlike the first hysteresis device 9. This second hysteresis device 27 is formed by a friction washer which is placed in abutment against the torque input part 7 of the damping device 5 and against the torque output part 6 of the damping device 5. This friction washer is configured in such a way as to axially hold the torque input part 7 in place.

The torque transmission device 1 may also include a pendular device (not shown) mounted fixed in rotation on the torque input element 4 or on the torque output element 23.

Although the invention has been described in connection with several particular embodiments, it is obvious that it is in no way limited thereto and that it includes all the technical equivalents of the means described as well as their combinations if these fall within the scope of the invention.

The use of the verb "to comprise", "to understand" or "to include" and of its conjugated forms does not exclude the presence of other elements or other steps than those set out in a claim.

In the claims, any reference sign in parentheses cannot be interpreted as a limitation of the claim.

Claims (17)

Torque transmission device (1) for a motor vehicle comprising:
a torque input element (4) adapted to be connected to a crankshaft of an engine shaft,
a torque output element (23) adapted to be connected to a gearbox,
a vibration damping device (5) comprising an input portion (7) rotatably coupled to the torque input member and a torque output portion (6) rotatably coupled to the torque output element, and at least one elastic member disposed between the torque input part and the torque output part and around an axis (X) of rotation of the torque transmission device, acting against the rotation of one of the inlet and outlet parts with respect to the other,
a first hysteresis device (9) arranged between the torque input part and the torque output part,
a lubricating device (11) of the first hysteresis device comprising a lubricating channel (12) through which a lubricating fluid passes, and
a cover (3) delimiting a space (25) containing the vibration damping device, the cover being configured such that it forms the lubrication channel, the lubrication channel being configured to open into the space (25). A torque transmission device according to claim 1, wherein the lubrication channel forms at least a first conduit. Torque transmission device according to Claim 2, in which the lubrication channel forms at least two first ducts, preferably equally distributed around the axis (X). Torque transmission device according to one of Claims 1 to 3, in which it also comprises a control device (10) of the first hysteresis device (9) which is formed by a piston (13) and a control fluid supply (14), the piston being capable of coming into contact with the first hysteresis device following the displacement of the control fluid present in the supply channel. Device according to Claim 4, in which the cover is configured in such a way that it forms the supply channel, the supply channel and the lubrication channel each forming a circuit independent of one another. Torque transmission device according to one of Claims 4 to 5, in which the fluid supply channel forms at least a second conduit. Torque transmission device according to Claim 6, in which the fluid supply channel forms at least two second ducts, preferably equally distributed around the axis (X). Torque transmission device according to one of Claims 1 to 3 and according to one of Claims 4 to 7, in which the lubrication channel and the supply channel respectively have a first lubricating fluid outlet (17) and a second supply fluid outlet (18), the first outlet emerging radially between the second outlet and the axis of rotation (X) of the transmission device. Torque transmission device according to Claim 3 and according to Claim 7, in which the first ducts and the second ducts are arranged one after the other alternately circumferentially. Torque transmission device according to Claim 9, in which the first ducts are arranged offset axially with respect to the second ducts. A torque transmission device according to claim 10, wherein the first ducts and the second ducts overlap each other. Torque transmission device according to one of Claims 1 to 11, in which the first hysteresis device comprises counter-disks (19) connected to the torque input part or the torque output part of the torque transmission device. damping and friction discs (20) connected to the torque output part or to the input part respectively of the damping device, the counter-discs and the friction discs being adapted to cooperate with each other. Torque transmission device according to Claim 12, in which the counter-discs are mounted on a first support (21) and the friction discs are mounted on a second support (22), the first support and the second support being mounted fixed in rotation respectively on the input part, or on the torque output part, and on the torque output part, or on the input part, of the damping device. A torque transmission device according to claim 12, wherein the backing discs are mounted on a third support and the friction discs are mounted on a fourth support, the third support and the fourth support being respectively formed by the input part , or by the torque output part, and by the torque output part, or by the input part, of the damping device. Torque transmission device according to one of the preceding claims, in which it comprises a second hysteresis device (27) formed by a friction washer placed in abutment against the torque input part and against the torque output part. damping device torque. Torque transmission device according to one of the preceding claims, in which it also comprises a pendular device mounted fixed in rotation on the torque output element or on the torque input element. Clutch of a motor vehicle comprising a torque transmission device according to one of the preceding claims.