FR3081948A1 - TORQUE TRANSMISSION SYSTEM AND TRANSMISSION INCLUDING SUCH A TORQUE TRANSMISSION SYSTEM - Google Patents

Abstract

Torque transmission system for a motor vehicle comprising: - a clutch mechanism (1) of axis of rotation (O) comprising at least one clutch (E1, E2) and an actuation system (7) arranged to engage or disengage said clutch (E1, E2), and - a fixing support (50) arranged to be fixed on a gearbox housing (30), the clutch mechanism (1) and the fixing support (50) are configured to be fixed integrally by means of a removable connection (40) in which the clutch mechanism (1) and the fixing support (50) are fitted one inside the other, the clutch mechanism (1) comprising a first relief (75) formed on the actuation system (7) adapted to cooperate with a second relief (55) formed on the fixing support (50), the first and second reliefs (75, 55) partially forming the removable connection (40), in which the removable connection (40) comprises deformation means (41) making it possible to fix r the clutch mechanism (1) on the fixing support (50).

Description

Torque transmission system and Transmission comprising such a torque transmission system

The present invention relates to a torque transmission system, and relates more particularly to the assembly of such a torque transmission system on a transmission, in particular for a motor vehicle or for a so-called industrial vehicle, the latter being for example a truck, a public transport vehicle, or an agricultural vehicle.

There are torque transmission systems which can be assembled and disassembled in a modular fashion on a transmission chain. The torque transmission system is formed by a clutch mechanism comprising in particular a clutch and a pre-assembled actuation system so as to form an independent module. This clutch mechanism is attached to a gearbox housing.

In known manner, this assembly on a transmission chain is a difficult step to implement due to the difficulty of access of a device for fixing said module on the gearbox casing.

Patent application US2014182994 A1 describes a device for fixing a module comprising a wet double clutch mechanism on a transmission, using fixing screws oriented axially and located on radial extension arms with a diameter greater than said double clutch mechanism.

This configuration simplifies the fixing step by radially positioning the screws on an outside diameter beyond the clutch mechanism, thus creating an access allowing the passage of a tool for fixing said clutch mechanism. However, this additional space leads to a larger radial size of said torque transmission system; It is also necessary to size the radial extension arms as a support for the fixing screws and requires adapting to the dimensional constraints of the gearbox housing.

To overcome these drawbacks, patent application WO201802930 A1 describes a fixing device using screws oriented axially through the wet double clutch mechanism, in order to collaborate with a threaded bore located on a face opposite the transmission.

This configuration certainly makes it possible not to increase the outside diameter of the fixing support relative to the clutch mechanism and to improve the transmission of the torque of the clutch mechanism; however, the solution requires making axial openings in the various elements of the clutch mechanism (pistons and disc holders), in order to allow the insertion of the fixing screw and the passage of the fixing tool. Subsequently, these openings made in the components of the clutch mechanism cannot be plugged since they ensure the successive passages of the fixing tool to assemble and disassemble the module. These non-plugged holes then generate losses of coolant liquid which are detrimental to the proper functioning of the transmission system. Furthermore, it is necessary to angularly index each element of the clutch mechanism in order to match the different openings before being able to insert the corresponding fixing screw or the fixing tool, which creates additional constraints and sometimes errors. irreversible.

The object of the present invention is to respond at least in large part to the above problems and to lead in addition to other advantages.

Another object of the invention is to propose a new clutch mechanism to solve at least one of these problems.

Another object of the present invention is to simplify the design of such a clutch mechanism.

Another object of the present invention is to facilitate the assembly of such a clutch mechanism on a transmission.

According to a first aspect of the invention, at least one of the abovementioned objectives is achieved with a torque transmission system comprising:

- a rotation axis clutch mechanism O comprising at least one clutch and an actuation system arranged to engage or disengage said clutch, and a fixing support arranged to be fixed on a gearbox housing, the mechanism clutch and the fixing support are configured to be fixed together by means of a removable connection in which the clutch mechanism and the fixing support are nested one inside the other, the clutch mechanism comprising a first relief formed on the actuation system adapted to cooperate with a second relief formed on the fixing support, the first and second reliefs partially forming the removable connection, in which the removable connection comprises deformation means making it possible to fix the clutch mechanism on the mounting bracket.

This torque transmission system, according to the invention, has the advantage of facilitating assembly of the clutch on the gearbox casing by fitting the clutch onto the fixing support previously fixed on said casing. .

The attachment of the clutch to the housing is facilitated by the deformation of the removable link.

Advantageously, the removable connection is inscribed radially inside the periphery of the clutch mechanism. The removable connection according to the invention has the advantage of reducing the radial size of the torque transmission system.

Advantageously, the deformation means are configured to allow axial locking of the clutch mechanism relative to the fixing support by deformation of the removable connection. The means of deformation of the removable link, according to the invention, have the advantage of simplifying the operations of fixing the clutch mechanism to the casing and of reducing assembly faults on the transmission chain.

Advantageously, these deformation means are dimensioned to generate a level of deformation lying in the elastic or plastic range of the material constituting the removable connection.

Advantageously, the first and second reliefs forming part of the removable link are configured to allow the clutch mechanism to rotate in rotation relative to the fixing support. The complementarity of the reliefs has the advantage of facilitating the assembly of the clutch on the gearbox housing and the angular indexing between the clutch mechanism and the fixing support.

The invention may have one or other of the characteristics described below, combined together or taken independently of one another:

- the clutch mechanism can be configured to come to bear on a flange formed in the fixing support to allow additional axial locking;

- the clutch mechanism can be configured to bear on a face provided in the gearbox casing to allow additional axial locking;

- According to a first variant, the first relief of the clutch mechanism can comprise at least one teeth projecting from a surface of the clutch mechanism and the second relief of the fixing support can comprise at least one groove formed on a surface of the support fixing, the teeth being able to be received in the groove;

- The first relief can be an external groove formed on a cylindrical surface of the clutch mechanism and the second relief can be an internal groove formed on a bore of the fixing support. The splines have the advantage of transmitting a high level of torque so that the clutch mechanism cannot rotate relative to the fixing support;

- According to a second variant, the second relief of the fixing support can comprise at least one toothing projecting from a surface of the fixing support and the first relief of the clutch mechanism can comprise at least one groove formed on a surface of the fixing mechanism 'clutch, the toothing being adapted to be received in the groove;

- The first relief can be an internal groove formed on a bore of the clutch mechanism and the second relief is an external groove formed on a cylindrical surface of the fixing support. The splines have the advantage of transmitting a high level of torque so that the clutch mechanism cannot rotate relative to the fixing support;

Advantageously, according to the first or the second variant, the external or internal groove can comprise a series of teeth distributed angularly around the axis O.

- the distribution of the teeth can be uniform or asymmetrical with respect to the axis O;

- The actuation system may include a housing housing at least one actuator arranged to engage or disengage said clutch, in which the first relief is formed on the outer periphery of the housing of the actuation system;

the removable link can to be a flange split formed sure the clutch mechanism; the removable link can to be a flange split formed sure the mounting bracket ; advantageously, the means of deformation | can

comprise a clamping device capable of deforming the split flange. The clamping device according to the invention has the advantage of simplifying the fixing of the clutch mechanism on the fixing support;

- the split flange may have two arms, each of the arms extending circumferentially around the axis O at an angle between 5 and 180 degrees;

- Advantageously, each of the arms can include a free end and another end embedded in the clutch mechanism or the fixing support;

- Advantageously, the free ends of the two arms can form the slot of the split flange;

- At least one of the two arms can be radially flexible, said flexible arm extending circumferentially from the embedding at an angle between 60 and 180 degrees;

- The flexible arm may include the first relief, for example the toothing.

- The flexible arm may include the second relief, for example the toothing.

- The deformation means may include a nut formed on one of the two arms and a clamping screw attached to the other arm, the clamping screw being capable of achieving axial locking by screwing into the nut. The assembly and disassembly operations of the clutch mechanism on the fixing support are thus facilitated.

Advantageously, the axis of the clamping screw can be contained in a plane orthogonal to the axis of rotation of the clutch mechanism.

Advantageously, the axis of the clamping screw can be orthoradial to the axis of rotation of the clutch mechanism. The radial size of the torque transmission system is thus reduced.

- The mounting bracket may include at least one bore capable of allowing the passage of an oil supply connector arranged on the gearbox casing. The fixing support according to the invention makes it possible to guarantee the sealing of the supply of hydraulic fluid to the actuation system.

- A seal can be placed between the mounting bracket and the gearbox housing.

Advantageously, the clutch mechanism and the fixing support may each comprise bores coming opposite one another and forming mutually an oil supply duct,

- The fixing support may include fixing lugs arranged to come to bear on the gearbox casing.

- the mounting bracket can be attached to the gearbox housing using a series of mounting screws.

The invention also relates, according to one of its aspects, to a transmission comprising a gearbox housing, and a torque transmission system as defined above, in which the clutch mechanism is fixedly attached to the support. fixing by deformation of the removable link.

The gearbox housing may include a hole for access to the clamping screw.

The access hole for the clamping screw may be orthoradial to the axis of rotation of the clutch mechanism.

The invention will be better understood on reading the description which follows, given solely by way of example and made with reference to the appended drawings in which:

- Figure 1 illustrates an axial sectional view of a wet double clutch mechanism comprising a transmission system according to a first embodiment of the invention;

- Figure 2 illustrates a perspective view of the clutch mechanism intended to be assembled with a fixing support illustrated in Figure 1 according to the first embodiment of the invention;

- Figure 3 illustrates an axial sectional view of the fixing support according to the first embodiment of the invention illustrated in Figure 1;

- Figure 4 illustrates a view in radial section of the clutch mechanism and the mounting bracket assembled according to the first embodiment of the invention;

- Figure 5 describes a radial sectional view of the clutch mechanism and the mounting bracket assembled according to a second embodiment of the invention.

In the following description and claims, the terms "front" or "rear" depending on the direction relative to an axial orientation determined by the main axis O will be used without limitation and in order to facilitate understanding thereof. of rotation of the transmission of the motor vehicle and the terms "interior / internal" or "exterior / external" with respect to the axis O and in a radial orientation, orthogonal to said axial orientation.

There is shown in Figures 1 to 4 a first embodiment of a wet double clutch mechanism 1 for the torque transmission system. The wet double clutch mechanism 1 has a main axis O of rotation.

The wet double clutch mechanism 1 comprises around the axis O at least one input element 2 which is linked in rotation to a driving shaft (not shown). The input element 2 is located at the rear of the wet double clutch mechanism 1. The input element 2 generally having an “L” shape has a radial orientation part formed by a web 3 of inlet and an axial orientation part formed by a hub 4. The inlet web 3 and the inlet hub 4 are integral, preferably fixed together by welding and / or by riveting.

The hub 4 is arranged radially inside with respect to the entry web 3. The input hub 4 is for example linked in rotation via the grooves 5 to the output of a damping device or damper 6 (such as a double damping flywheel, etc.) whose input is linked , in particular by means of a flywheel, to the drive shaft formed by a crankshaft which is driven in rotation by an engine fitted to the motor vehicle.

On the side of its external / upper radial end with axial orientation, the entry web 3 is linked in rotation to a first clutch E1 by means of an entry disc holder 14, the disc holder inlet 14 being linked in rotation to the inlet web 3, preferably by cooperation of shapes, for example by grooves. The entry veil 3 comprises for example, at its external radial end of axial orientation, teeth 9 which extend radially outwards and which are supported on the entry disc port 14.

As illustrated in FIG. 1, the wet double clutch mechanism 1 for the torque transmission system comprises a first clutch E1 and a second clutch E2, which are respectively of the multi-disc type, as well as an actuation system ίο 7 arranged for engage or disengage said first and second clutches E1, E2.

As illustrated in FIG. 1, the first clutch E1 is arranged radially above the second clutch E2. In a variant not shown, the first and second clutches E1, E2 can be arranged axially one next to the other.

The wet double clutch mechanism 1 is controlled to selectively couple said shaft leading to a first driven shaft A1 and to a second driven shaft A2.

Preferably, the first driven shaft A1 and the second driven shaft A2 are coaxial.

The first driven shaft A1 is driven in rotation when said first clutch E1 is closed and the second driven shaft A2 is rotated when said second clutch E2 is closed, said first and second driven shafts A1, A2 being respectively connected to a gearbox gears fitted to the motor vehicle.

As illustrated in FIG. 1, the multi-disc assembly of the first clutch E1 includes flanges 11 linked in rotation to the input disc holder 14 and friction discs 12 linked in rotation to an output disc holder 13. The discs 12 of friction are, unitarily, axially interposed between two successive flanges 11.

The output disc holder 13 of the first clutch E1 is linked in rotation by meshing with the friction discs 12 and by a splined connection with said first driven shaft A1.

The output disc holder 13 comprises a hub 131 of cylindrical shape with axis of rotation O and a disc support 130 of shape of revolution around the axis O, the disc support 130 being in axial support on the hub 131 The outlet disc holder 13 generally has an “L” shape, the inner radial end of which is secured to the grooved outlet hub 131.

The multi-disc assembly of the second clutch E2 comprises flanges 21 linked in rotation to the input disc holder 14 and friction discs 22 linked in rotation to an output disc holder 23. The input disc holder 14 is common to the first and second clutch E1, E2.

The output disc holder 23 of the second clutch E2 is linked in rotation by engagement with the friction discs 22 and by a splined connection with said second driven shaft A2.

As illustrated in FIG. 1, the first and second clutches E1 and E2 are controlled by an actuation system 7 comprising:

- A first actuator 71 arranged to configure the first clutch E1 in a configuration between the engaged configuration and the disengaged configuration;

- A second actuator 72 arranged to configure the second clutch E2 in a configuration between the engaged configuration and the disengaged configuration;

a housing 73 in which are housed at least (in part) the first or second actuator 71, 72.

The housing 73 of the actuation system is preferably made in one piece. Optionally, it can be achieved by assembling several parts. For example, the actuation system may include a clutch support 74 integrated in the casing and extending axially in the direction of the inlet hub 3. The clutch support 74 of the actuation system 7 is coupled in rotation with the casing 73.

The first actuator 71 is linked to the first clutch E1 via on the one hand a first decoupling bearing 711 and on the other hand a first force transmission member 712. The first decoupling bearing 711 is arranged for transmitting axial forces generated by the first actuator 71 to the first force transmission member 712.

The first force transmission member 712 takes the form of a corrugated sheet metal which is curved axially forwards at its outer radial end. The first force transmission member 712 is arranged to transmit an axial force to the first clutch E1 via an external elongation 710, said external elongation 710 extending axially forwards so as to be able to spread or press the flanges 11 against the discs 12 d on the one hand, and against an external reaction means 8 of the entry web 3 on the other hand.

The second actuator 72 is linked to the second clutch E2 via on the one hand a second decoupling bearing 721 and on the other hand a second force transmission member 722. The second decoupling bearing 721 is arranged for transmitting axial forces generated by the second actuator 72 to the second force transmission member 722.

In the first embodiment illustrated in FIGS. 1 to 4, the torque transmission system comprises a clutch mechanism and a fixing support 50 fixed to a gearbox casing 30.

In the example of Figure 1, the clutch mechanism is a wet double clutch mechanism 1.

The wet double clutch mechanism 1 and the fixing support 50 are fixed together by means of a removable connection 40 in which the wet double clutch mechanism 1 and the fixing support 50 are fitted one inside the other .

The fixing support 50 has a substantially annular shape.

The fixing of the fixing support 50 to the gearbox casing 30 is here formed using a series of fixing screws 51.

In a variant not shown, the fixing support 50 can be formed directly in the gearbox casing.

The fixing support 50 comprises fixing lugs 52 which come to bear on the gearbox casing 30. The fixing lugs 52 are three in number and angularly distributed around the axis O. The distribution of said fixing lugs 52 is uniform with respect to the axis O.

The removable link 40 comprises deformation means 41 making it possible to fix the wet double clutch mechanism 1 on the fixing support 50.

The deformation means 41 are here configured to allow axial locking of the wet double clutch mechanism 1 relative to the fixing support 50 by deformation of the removable connection 40.

Advantageously, the removable link 40 is inscribed radially inside the periphery of the wet double clutch mechanism 1.

In the first embodiment, a first external relief 75 and a second internal relief 55 partly form the removable connection 40. The wet double clutch mechanism 1 comprises the first external relief 75 which is formed on the actuation system 7. The fixing support 50 comprises the second internal relief 55 which is adapted to cooperate with the first external relief 75.

The first relief 75 is an external groove formed on a cylindrical surface of the wet double clutch mechanism 1, in particular on the outer periphery of the housing 73 of the actuation system. The second relief 55 is an internal groove formed on a bore of the fixing support 50.

Here we define a groove respectively external and internal as an assembly respectively comprising a series of several teeth and / or several grooves.

The first and second reliefs 75, 55 forming in part the removable connection 40 are configured to allow the rotational locking of the wet double clutch mechanism 1 relative to the fixing support 50.

As illustrated in Figures 1 to 2, the wet double clutch mechanism 1 is configured to come to bear on a face provided in the gearbox casing to allow additional axial locking. In particular, a front face 730 of the casing 73 of the actuation system 7 bears on a rear face 300 of the casing 30 of the gearbox. This additional axial locking makes it possible to precisely position the clutch mechanism relative to the gearbox.

In a variant which is not shown, the front face of the housing of the actuation system can come to bear on a flange formed directly in the fixing support to allow additional axial locking.

In this case, said flange may be annular and disposed in the interior volume formed by the groove of the fixing support.

As illustrated in FIGS. 2 to 4, the removable connection 40 is produced in the form of a split flange 44 formed on the fixing support 50.

The split flange 44 has two arms 45, 46 extending circumferentially around the axis O. Free ends 441 of the two arms 45, 46 form the slot of the split flange 44.

As illustrated in FIG. 4, and according to the first embodiment of the invention, the arms have different lengths.

Generally, the arms 45, 46 extend circumferentially at an angle between 5 and 180 degrees.

Each of the arms 45, 46 comprises a free end 441 and another end embedded 442 in the fixing support 50. Advantageously, at least one of the two arms 45, 46 is radially flexible, said flexible arm extending circumferentially from the embedding at an angle between 60 and 180 degrees.

The flexible arm may include a toothing.

The deformation means 41 of the removable link 40 comprise a clamping device 47 able to deform said split flange 44. The clamping device 47 comprises in particular a clamping screw 48 screwed into one of the arms 45, 46 of the fixing support.

The fixing support 50 comprises a bore 480 formed in the arm 45 for the passage of the clamping screw 48.

The tightening device 47 also comprises a nut 481 formed on the other arm 46. By means of the tightening of the tightening screw 48 in the nut, the axial locking is achieved. The nut is made by drilling and tapping the end of the arm.

Advantageously, the axis 482 of the tightening screw 48 is contained in a plane orthogonal to the axis of rotation O. In addition, the axis 410 of the tightening screw 48 is orthoradial to the axis of rotation O of the split flange 44.

As illustrated in Figure 1, the clutch mechanism is hydraulically controlled by means of a pressurized fluid, usually oil.

Preferably, the first and second actuators 71 and 72 are of the hydraulic cylinder type and each comprise an annular piston. Each annular piston is coaxial with the O axis and develops an axial movement to configure the corresponding clutch. As a result, the actuation system 7 also includes an oil supply connector for each actuator 71, 72.

The mounting support 50 includes a central bore allowing the passage of an oil supply connector coming from the gearbox casing 30. The oil connector is connected to the casing 73 of the actuation system 7.

Advantageously, a seal can be placed between the fixing support 50 and the gearbox casing 30.

As a variant, the wet double clutch mechanism 1 and the fixing support 50 may each include bores facing each other and forming an oil supply pipe mutually.

In a second embodiment illustrated in FIG. 5, the first relief 75 of the wet double clutch mechanism 1 has a toothing 76 projecting from a surface of the wet double clutch mechanism 1 and the second relief 55 of the fixing support 50 comprises at least one groove 56 formed on a surface of the fixing support 50, the toothing 76 being able to be received in the groove 56.

Advantageously, the removable connection can comprise a limited number of teeth, for example a single tooth 76 as illustrated in FIG. 5. The fitting of a single tooth in a groove forms a keying device capable of angularly indexing the mechanism with wet double clutch 1 with respect to the fixing support 50. The positioning of the torque transmission system within the gearbox casing is thus simplified.

A third mode of implementation of the invention not shown differs from the first mode of implementation in that the removable connection is produced in the form of a split flange formed on the clutch mechanism. The wet double clutch mechanism and the fixing support are fixed together by means of a removable connection in which the wet double clutch mechanism 1 fits on the outer periphery of the fixing support.

The removable link includes a first internal relief formed on the actuation system of the clutch mechanism, as well as a second external relief formed on the fixing support. The second external relief is adapted to cooperate with the first internal relief.

In this third embodiment, not shown, the second external relief of the fixing support comprises at least one toothing projecting from a surface of the fixing support.

In this mode, the first interior relief of the clutch mechanism comprises at least one groove formed on a surface of the clutch mechanism. Said toothing of the second external relief is able to be received in said internal groove.

The invention is not limited to the examples of implementation which have just been described.

Claims (15)

1. Torque transmission system for a motor vehicle comprising: - a clutch mechanism (1) of axis of rotation (O) comprising at least one clutch (E1, E2) and an actuation system (7) arranged to engage or disengage said clutch (E1, E2), and - a fixing support (50) arranged to be fixed on a gearbox casing (30), the clutch mechanism (1) and the fixing support (50) are configured to be fixed integrally using '' a removable link (40) in which the clutch mechanism (1) and the fixing support (50) are nested one inside the other, the clutch mechanism (1) comprising a first relief (75) formed on the actuation system (7) adapted to cooperate with a second relief (55) formed on the fixing support (50), the first and second reliefs (75, 55) partly forming the removable connection (40), wherein the removable link (40) comprises deformation means (41) for fixing the clutch mechanism (1) on the fixing support (50). 2. Torque transmission system according to claim 1, in which the deformation means (41) are configured to allow axial locking of the clutch mechanism (1) relative to the fixing support (50) by deformation of the link. removable (40). 3. Torque transmission system according to one of claims 1 to 2, in which the removable connection (40) is inscribed radially inside the periphery of the clutch mechanism (1). 4. Torque transmission system according to any one of the preceding claims, in which the first and second reliefs (75, 55) forming in part the removable link (40) are configured to allow rotation clutch locking. (1) relative to the fixing support (50). 5. Torque transmission system according to any one of the preceding claims, in which the removable link (40) is a split flange (44) formed on the clutch mechanism (1) or the fixing support (50). 6. Torque transmission system according to the preceding claim, in which the deformation means (41) comprise a clamping device (47) capable of deforming the split flange (44). 7. Torque transmission system according to one of claims 5 to 6, in which the split flange (44) comprises two arms (45, 46), each of the arms (45, 46) extending circumferentially around the axis (O) at an angle between 5 and 180 degrees. 8. Torque transmission system according to the preceding claim, in which at least one of the two arms (45, 46) is radially flexible, said flexible arm (45, 46) extending circumferentially from the embedding (442) according to a angle between 60 and 180 degrees. 9. Torque transmission system according to one of claims 7 to 8, in which the deformation means (41) comprise a nut (481) formed on one of the two arms (45, 46) and a clamping screw (48) attached to the other arm, the clamping screw (48) being capable of achieving axial locking by screwing into the nut (481). 10. Torque transmission system according to the preceding claim, wherein the axis of the clamping screw (48) is orthoradial to the axis of rotation (O) of the flange (44). 11. Torque transmission system according to any one of the preceding claims, in which the first relief (75) of the clutch mechanism (1) comprises at least one toothing (76) projecting from a surface of the clutch mechanism (1) and the second relief (55) of the fixing support (50) comprises at least one groove (56) formed on a surface of the fixing support (50), the toothing (76) being able to be received in the groove (56). 12. Torque transmission system according to the preceding claim, in which the first relief (75) is an external groove formed on a cylindrical surface of the clutch mechanism (1) and the second relief (55) is an internal groove formed on a bore in the fixing support (50). 13. Torque transmission system according to any one of the preceding claims, the actuation system (7) comprising a casing (73) housing at least one actuator (71, 72) arranged to engage or disengage said clutch (E1, E2), in which the first relief is formed on the outer periphery of the casing (73) of the actuation system (7). 14. Torque transmission system according to any one of the preceding claims, in which the fixing support (50) comprises at least one bore capable of allowing the 5 passage of an oil supply connector arranged on the gearbox casing (30). 15. Transmission comprising a gearbox housing (30), 10 and a torque transmission system according to any one of the preceding claims, in which the clutch mechanism (1) is fixed integrally to the fixing support (50) by deformation of the removable link (40).