FR3093149A1 - CASING ASSEMBLY FOR HYDRAULIC ACTUATOR AND HYDRAULIC ACTUATOR INCLUDING THIS CASING ASSEMBLY - Google Patents

Abstract

The invention relates to an assembled housing (50) for a hydraulic actuator, comprising: an actuating body (60) of cylindrical shape comprising at least a first annular chamber (61) of average implantation diameter (A) capable of receiving a first actuating piston (41) and pressurized fluid, a fluid distribution plate (70) in axial bearing on the actuating body (60) comprising at least a first fluid distribution channel (71) communicating with the first annular chamber (61), a closure plate (80) bearing axially on the fluid distribution plate (70), said closure plate (80) comprising at least a first fluid inlet port (81), and the first fluid distribution channel (71) extending substantially radially and communicating the first annular chamber (61) with the first inlet port (81) of flu ide. Figure for the abstract: Figure 1

Description

CASING ASSEMBLY FOR HYDRAULIC ACTUATOR AND HYDRAULIC ACTUATOR INCLUDING THIS CASING ASSEMBLY

The present invention relates to an assembled casing for a clutch mechanism hydraulic actuator and a hydraulic clutch mechanism actuator comprising this assembled casing. The clutch mechanism can be a hybrid transmission cut-off clutch or a dual-clutch mechanism operating in a dry or wet environment.

Such a hydraulic actuator is intended to form part of a torque transmission system, in particular for a motor vehicle or for a so-called industrial vehicle, the latter being for example a heavy goods vehicle, a public transport vehicle, or a vehicle agricultural.

Patent application WO2011/063796A1 discloses a hydraulic clutch mechanism actuator for a motor vehicle and a double wet clutch mechanism comprising torque input means intended to be coupled to a crankshaft. The double wet clutch mechanism cooperates with a first torque output shaft and a second torque output shaft of the gearbox. For this, said mechanism comprises a first clutch capable of coupling or decoupling the torque input means and the first torque output shaft, a second clutch capable of coupling or decoupling the torque input means and the second torque output. The first and second clutches, respectively of the multi-disc type, are arranged radially one above the other. Each of the multi-disc clutches comprises flanges connected in rotation to an input disk carrier forming the torque input means and friction disks connected in rotation to output disk carriers. When changing gear ratios, the multi-plate clutches are actuated separately using hydraulically controlled actuation pistons within the hydraulic actuator. This hydraulic actuator comprises in particular a casing formed from a single piece in which are formed the chambers of the actuating pistons as well as the pressurized fluid supply pipes, for example oil, opening into said chambers.

The hydraulic actuator housing is a component grouping together a large number of functions, such as the guiding of the actuating pistons, the pressurized fluid supply or the centering of the actuator on the gearbox housing. Some of these features are considered critical in terms of reliability for the proper functioning of the clutch mechanism. Therefore, this type of hydraulic actuator casing is obtained by molding then machining in the mass of the various functional surfaces: for example, the pressurized fluid supply pipes are obtained by drilling. This type of operation is complex and increases the manufacturing time. These machining operations lead to additional manufacturing costs.

The hydraulic actuator housing is formed from a single piece and fits exclusively the adaptation of the gearbox for which it is specifically designed. Such a hydraulic actuator housing cannot be standardized for other different gearbox applications.

The object of the invention is in particular to provide a simple, effective and economical solution to this problem.

The object of the present invention is in particular to propose an assembled casing for a hydraulic actuator making it possible to solve at least some of certain drawbacks of the prior art.

For this purpose, the invention proposes, according to a first of its aspects, an assembled casing for a hydraulic actuator of a clutch mechanism, comprising:
- actuation body of generally cylindrical shape with an axis of revolution O comprising a central bore and at least one first annular chamber of average implantation diameter A capable of receiving a first actuation piston and pressurized fluid;
- a fluid distribution plate bearing axially on the actuator body comprising at least one first fluid distribution channel communicating with the first annular chamber and a central bore;
- a closure plate bearing axially on the fluid distribution plate, comprising a central bore;
said closure plate comprising at least a first fluid inlet orifice oriented along the axis O implanted on an implantation diameter C greater than the implantation diameter A, and the first fluid distribution channel of the distribution plate of fluid extending substantially radially and communicating the first annular chamber with the first fluid inlet orifice.

This assembled casing, according to the invention, has the advantage of being able to standardize the actuator body. For each gearbox application, a fluid distribution plate and a closing plate, specifically dedicated to this gearbox, are attached to the actuator body. By increasing the production volume of the actuator body, it is possible to reduce manufacturing costs.

The first fluid inlet orifice formed on the closure plate is offset radially with respect to the average implantation diameter of the first annular chamber. The hydraulic actuator can be supplied with pressurized fluid regardless of the architecture of the gearbox and regardless of the position of the pressurized fluid supply lines using a fluid distribution plate having simple shapes. Advantageously, it is possible to adapt to any gearbox adaptation without increasing the cost of the assembled housing.

Preferably, the actuating body may comprise a second annular chamber of average implantation diameter B capable of receiving a second actuating piston and pressurized fluid, the diameter B being greater than the diameter A,
and the closure plate may include a second fluid inlet orifice oriented along the axis O implanted on an implantation diameter D greater than the implantation diameter A,
and the oil distribution plate may comprise a second fluid distribution channel extending substantially radially and communicating the second annular chamber with the second fluid inlet orifice. This assembled housing architecture can be proposed for a double clutch mechanism without increasing the cost of the hydraulic actuator.

Advantageously, the first fluid distribution channel and the second fluid distribution channel are distinct and separated by a sealed wall.

The closure plate may include an additional cooling fluid inlet orifice oriented along the axis O located on an installation diameter E greater than the installation diameter A and intended to receive cooling fluid, and the fluid distribution may include an additional fluid distribution channel extending substantially radially, opening into the central bore and communicating with the additional cooling fluid inlet orifice. The assembled housing can thus collect the cooling fluid from the gearbox housing and direct it towards the clutch mechanism independently of the actuator body. Thanks to the standardization of the actuating body, it is possible to reduce manufacturing costs.

Advantageously, the additional fluid distribution channel is distinct from the first fluid distribution channel and from the second fluid distribution channel and separated by a sealed wall.

The invention may have one or other of the characteristics described below combined with each other or taken independently of each other:

the fluid distribution plate may comprise a flat face bearing on the closure plate, at least one of the fluid distribution channels extending parallel to this flat face;

the first fluid distribution channel can extend parallel to this flat face;

the second fluid distribution channel can extend parallel to this flat face;

the additional fluid distribution channel can extend parallel to this flat face;

at least one of the fluid distribution channels can open out continuously along this flat face;

the first fluid distribution channel of the fluid distribution plate can communicate with the first actuation chamber via a first fluid passage orifice oriented along the axis (O) and located on the mean diameter location A;

the second fluid distribution channel of the fluid distribution plate can communicate with the second actuation chamber via a second fluid passage orifice oriented along the axis (O) and located on the mean diameter location B;

the actuating body may comprise fluid passage orifices oriented along the axis (O) communicating with the chambers of the actuating pistons and opening out onto the face resting on the fluid distribution plate at the level of holes provided in the fluid distribution plate;

the fluid distribution plate may include a groove arranged to receive a seal and formed on the flat face, said groove extending along at least one of the fluid distribution channels;

the groove can surround the fluid distribution channels continuously;

the fluid distribution plate can be made by molding and/or machining;

the groove can be made by molding;

the groove can be made by machining;

the passage section of the first and second fluid inlet orifices of the closure plate may be greater than the passage section of the additional cooling fluid inlet orifice;

the assembled casing may include a seal disposed axially between the fluid distribution plate and the closure plate;

the seal may be a flat seal bearing against the flat face of the fluid distribution plate;

the seal may be a molded seal, applied in the groove formed on the fluid distribution plate;

at least one of the components among the actuation body, the fluid distribution plate, the closing plate can be made of a material of the steel, or aluminum or plastic type;

the actuating body, the fluid distribution plate and the closing plate can be assembled by screwing, or riveting, or welding;

According to a variant of the first aspect of the invention, the assembled casing may comprise a tubular support concentric with the axis O, said tubular support jointly penetrating the actuator body, the oil distribution plate and the closing plate in their central bores.

Preferably, the tubular support can be arranged to support a clutch mechanism associated with the hydraulic actuator.

This assembled casing, according to this variant of the first aspect of the invention, has the advantage of reinforcing the structure of the hydraulic actuator. The actuating body, the oil distribution plate and the closing plate are held in position using the tubular support.

Advantageously, the tubular support may comprise two ends, one of the ends is inserted into the closure plate and the other end is free and extends axially beyond the actuator body.

Preferably, the tubular support may comprise a cooling fluid conduit extending in part axially which communicates with the additional fluid distribution channel, the connection being made at the level of the central bore of the fluid distribution plate. This assembled casing, according to this variant of the first aspect of the invention, has the advantage of directing the cooling fluid in the direction of the clutch mechanism.

Preferably, the cooling fluid pipe can lead to the free end of the tubular support. The coolant conduit may be at least partially machined into the tubular support.

Advantageously, the tubular support can be made in two parts of substantially cylindrical shape, a first outer part bearing on the central bore of the actuator body and a second inner part fitted into the first outer part. The cooling fluid pipe can be formed in a free space located between the first external part and the second internal part.

The invention also relates, according to a second aspect, to a hydraulic actuator for a clutch mechanism comprising an assembled casing incorporating all or part of the characteristics mentioned above and at least one first actuating piston sliding axially in said at least first chamber annular.

This hydraulic actuator has the advantage of using standardized components and being economical to manufacture.

The hydraulic actuator may include a second actuating piston sliding axially in the second annular chamber.

The hydraulic actuator can be supplied with fluid under pressure and/or with cooling fluid, the fluid being for example oil.

All or some of the characteristics mentioned above also apply to this other aspect of the invention.

The invention also relates, according to a third aspect, to a torque transmission system comprising:
- a gearbox housing,
- a clutch mechanism, and
- a hydraulic actuator incorporating all or part of the characteristics mentioned above,
the hydraulic actuator being fixed to the gearbox casing by means of the closing plate of the assembled casing.

Advantageously, the hydraulic actuator can be assembled on the gearbox casing by means of fixing screws which pass jointly through the actuator body, the fluid distribution plate and the closure plate. The fixing screws have the advantage of assembling together the components of the assembled casing and fixing the hydraulic actuator at the same time on the gearbox.

Preferably, the hydraulic actuator can support the clutch mechanism via a guide bearing arranged on the tubular support of the assembled housing.

Preferably, the clutch mechanism may include:
- a torque entry disc holder,
- at least one multi-disc clutch comprising flanges linked in rotation to the torque input disc holder and friction discs linked in rotation to a torque output disc holder, and
- a guide bearing arranged radially between the torque input disc holder and the tubular support of the hydraulic actuator.

The invention will be better understood on reading the following description, given solely by way of example and made with reference to the appended drawings in which:
- the figure is a view in axial section of a torque transmission system comprising a hydraulic actuator with a casing assembled according to a first mode of implementation of the invention;
- the figure is an exploded isometric view of the hydraulic actuator according to the first mode of implementation of the invention of FIG. 1;
- the figure is a front view of the casing assembled according to the first mode of implementation of the invention of FIG. 1;
- the figure is another view in axial section of the torque transmission system according to the first mode of implementation of the invention of FIG. 1;
- the figure is a view in axial section of a torque transmission system comprising a hydraulic actuator with a casing assembled according to a second embodiment of the invention;
- the figure is an isometric and exploded view of the hydraulic actuator according to the second embodiment of the invention of Figure 5.

In the remainder of the description and the claims, the terms “front” or “rear” will be used, without limitation and in order to facilitate understanding, depending on the direction with respect to an axial orientation determined by the main axis O of rotation of the transmission of the motor vehicle and the terms "inner/internal" or "outer/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 mode of implementation of an assembled housing 50 for a hydraulic actuator. Figure 1 shows a torque transmission system 1 comprising a gearbox housing 2, a clutch mechanism and a hydraulic actuator 40 arranged to control the clutch mechanism. The hydraulic actuator 40 is assembled on the gearbox housing 2 by means of fixing screws 3. The hydraulic actuator is supplied with fluid under pressure and with cooling fluid by supply lines formed in the housing 2 gearbox.

In the example illustrated in Figure 1, the clutch mechanism is a double wet clutch mechanism 10 having a main axis of rotation O.

The double wet clutch mechanism 10 comprises around the axis O at least one torque input disc carrier 11 which is connected in rotation to a drive shaft (not shown). The torque input disc carrier 11 is located at the rear of the dual wet clutch mechanism 10.

The torque input disc carrier 11 is for example connected in rotation via spline 12 to the output of a damping device (such as a double damped flywheel, etc.) whose input is connected to a crankshaft which rotates an engine fitted to the motor vehicle.

The double wet clutch mechanism 10 is controlled to selectively couple said driving shaft to a first driven shaft A1 and to a second driven shaft A2 connected to a gearbox fitted to the motor vehicle.

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 driven in rotation when said second clutch E2 is closed.

The double wet clutch mechanism 10 comprises a first clutch E1 and a second clutch E2, which are respectively of the multi-disc type, as well as a hydraulic actuator 40 arranged to engage or disengage said first and second clutches E1, E2.

The double wet clutch mechanism 10 is hydraulically controlled by means of a pressurized fluid, generally oil. The Hydraulic Actuator 40 includes:
- a first actuating piston 41 arranged to configure the second clutch E2 in a configuration between the engaged configuration and the disengaged configuration,
- a second actuating piston 42 arranged to configure the first clutch E1 in a configuration between the engaged configuration and the disengaged configuration,
- an assembled casing 50 in which are housed at least (in part) the first and the second actuating piston 41, 42.

As illustrated in Figure 1, the first clutch E1 is arranged radially above the second clutch E2.

The multi-disc assembly of the first clutch E1 comprises flanges connected in rotation to the input disk carrier 11 and friction disks connected in rotation to an output disk carrier 30.

The output disc carrier 30 is connected in rotation with said first driven shaft A1 by a splined connection.

The multi-disc assembly of the second clutch E2 comprises flanges connected in rotation to the input disk carrier 11 and friction disks connected in rotation to an output disk carrier 40.

The output disc carrier 40 is connected in rotation with said second driven shaft A2 by a splined connection.

The input disc carrier 11 is for example common to the first and to the second clutch E1 and E2.

Will now be described with reference to Figure 2 and Figure 3, an assembled housing 50 according to the first embodiment of the invention. The assembled casing 50 comprises in particular an actuation body 60 of generally cylindrical shape with an axis of revolution O comprising a central bore 63. The actuation body 60 is preferably made of molded plastic material.

The actuating body 60 comprises a first annular chamber 61 of average installation diameter A capable of receiving the first actuating piston of the hydraulic actuator 50.

The actuating body 60 also comprises a second annular chamber 62 of mean implantation diameter B capable of receiving the second actuating piston of the hydraulic actuator 50. The mean implantation diameter B is greater than the mean diameter of implantation a.

The pressurized fluid enters the first annular chamber 61 with the aid of a first fluid passage orifice 64 oriented along the axis O. The fluid passage orifice 64 is located on a diameter close to the mean diameter d implantation A.

The pressurized fluid enters the second annular chamber 62 with the aid of a second fluid passage orifice 65 oriented along the axis O. The fluid passage orifice 65 is located on a diameter close to the mean diameter d implantation B.

The first and second annular chambers receive pressurized fluid in order to be able to alternately actuate the actuating pistons 41 and 42 and act on the clutches E1 and E2. When starting the vehicle, pressurized fluid is sent into the second annular chamber 62 in order to engage the first clutch E1 and to transmit the engine torque in the direction of the driven shaft A1. At this stage of starting, the first annular chamber 61 is not supplied with pressurized fluid. Then, the pressurized fluid is sent into the first annular chamber 61 in order to engage the second clutch E2 and to transmit the engine torque in the direction of the driven shaft A2. The second annular chamber 62 is then no longer supplied with pressurized fluid. These alternative actions are repeated until the vehicle reaches a stabilized speed.

The assembled casing 50 comprises, among other things, a fluid distribution plate 70 bearing axially on the actuator body 60 comprising a first fluid distribution channel 71 communicating with the first annular chamber 61, a second fluid distribution channel 72 communicating with the second annular chamber 62 and a central bore 73. The fluid distribution plate 70 has a small thickness compared to its other dimensions. The fluid distribution plate 70 is preferably made of aluminum by casting.

The first orifice and the second fluid passage orifice 64, 65 of the actuator body open onto a face 66 bearing on the fluid distribution plate 70 at the level of holes 71a, 72a arranged in the fluid distribution plate. . These holes 71a, 72a communicate with the two channels 71 and 72.

The assembled casing 50 also includes a closure plate 80 bearing axially on the fluid distribution plate 70. The closure plate comprises a central bore 83 in which the driven shafts A1 and A2 are housed. The closure plate 80 comprises a centering surface 85 extending axially and arranged to be housed in a bore of the housing 2 of the gearbox. The closure plate 80 is preferably made of steel by stamping and/or machining.

The processes for manufacturing the fluid distribution plate 70 and the closure plate 80 are rather suited to small series production, while the manufacturing process by plastic injection of the actuator body 60 is rather suited to mass production. large series.

The closure plate 80 has a first fluid inlet orifice 81 oriented along the axis O implanted on an implantation diameter C greater than the implantation diameter A.

The first fluid distribution channel 71 of the fluid distribution plate 70 extends substantially radially and communicates the first annular chamber 61 with the first fluid inlet orifice 81. In the example of the first mode of implementation of the invention, the first fluid inlet orifice 81 formed on the closure plate 80 is offset radially with respect to the average implantation diameter A of the first annular chamber 61 The hydraulic actuator can thus be supplied with pressurized fluid regardless of the architecture of the gearbox and regardless of the position of the pressurized fluid supply lines.

The closure plate 80 has a second fluid inlet orifice 82 oriented along the axis O implanted on an implantation diameter D greater than the implantation diameter A.

The second fluid distribution channel 72 of the fluid distribution plate 70 extends substantially radially and communicates the second annular chamber 62 with the second fluid inlet orifice 82. The second fluid inlet orifice 82 formed on the closure plate 80 is offset radially with respect to the average implantation diameter B of the second annular chamber 62.

As illustrated in Figure 2 and Figure 3, the first fluid distribution channel 71 and the second fluid distribution channel 72 are separate and separated by a sealed wall. A portion of a seal 51 is in particular placed between the two channels 71 and 72.

In the example of the first mode of implementation of the invention, the closure plate 80 comprises an additional orifice 84 for inlet of cooling fluid oriented along the axis O implanted on an implantation diameter E greater than the diameter location A. This additional orifice 84 is intended to receive the cooling fluid coming from the housing 2 of the gearbox.

As illustrated in FIG. 4, the fluid distribution plate 70 also comprises an additional fluid distribution channel 74 extending substantially radially, opening into the central bore 73 and communicating with the additional fluid inlet orifice 84 cooling. The assembled casing 50 thus collects the cooling fluid coming from the casing 2 of the gearbox. The coolant is directed toward the clutch mechanism independently of the actuator body 60. The coolant then flows into a space formed between the central bore of the hydraulic actuator 40 and the outer surface of the actuator. driven shaft A2, then disperses within the double wet clutch mechanism 10.

The passage section of the first and second fluid inlet orifices 81, 82 of the closure plate 80 is greater than the passage section of the additional orifice 84 of the cooling fluid inlet.

As illustrated in FIG. 2 and FIG. 3, the additional fluid distribution channel 74 is distinct from the first fluid distribution channel 71 and from the second fluid distribution channel 72 and separated by a sealed wall. A portion of the seal 51 is also placed between the additional fluid distribution channel and the two channels 71 and 72.

The fluid distribution plate 70 comprises a flat face 75 bearing on the closure plate 80. This flat face 75 contributes to the sealing of the hydraulic actuator 40.

The first and second fluid distribution channels 71 and 72 extend parallel to this flat face, as does the additional fluid distribution channel 74. The fluid distribution channels 71, 72 and 74 open out continuously along this flat face. This geometry has the advantage of being easily obtained by molding or machining.

The sealing of the hydraulic actuator 40 is ensured by seals arranged between the actuator body, the oil distribution plate and the closing plate.

More specifically, the fluid distribution plate 70 comprises a groove 76 arranged to receive a seal 51 and formed on the flat face 75. The groove 76 extends along the fluid distribution channels 71, 72 and 74 and surrounds said channels continuously. The groove 76 is obtained for example by machining. The continuity of the groove 76 guarantees tightness of the assembled casing 50. The seal 51 is inserted in the groove 76. The seal 51 can be obtained by molding.

In a variant not shown, the flat face 75 may comprise a plurality of grooves surrounding each of the channels in which separate seals are arranged.

In a variant not shown, the seal may be a flat seal bearing against the flat face of the fluid distribution plate.

The assembled casing also includes a seal arranged axially between the actuator body 60 and the fluid distribution plate 70. This seal, not shown, may for example be a flat seal. Other sealing devices can be arranged between these two components.

The assembly of the hydraulic actuator 40 is ensured by the fixing screws 3 which jointly pass through the actuator body, the oil distribution plate and the closing plate before penetrating into the casing 2 of the gearboxes.

Alternatively, the actuator body, the fluid distribution plate and the closing plate can be assembled by riveting or welding.

Will now be described with reference to Figure 5 and Figure 6, an assembled housing 50 according to the second mode of implementation of the invention substantially similar to the first mode of implementation with the exception of the fact that the assembled housing 50 comprises a tubular support 90 concentric with the axis O jointly penetrating the actuator body, the oil distribution plate and the closure plate in their central bores.

The tubular support 90 passes through the central bore 63 of the actuator body 60, the central bore 73 of the oil distribution plate 70 and the central bore 83 of the closure plate 80. The insertion of this support tubular 90 has the effect of reinforcing the mechanical structure of the hydraulic actuator 40. The tubular support 90 comprises two ends 93 and 95, one of the ends 93 is inserted into the closure plate 80 and the other end 95 is free and extends axially beyond the actuator body 60 towards the clutch mechanism.

Figure 5 shows the torque transmission system 1 comprising a gearbox housing 2, the double wet clutch mechanism 10 and the hydraulic actuator 40 according to the second mode of implementation of an assembled housing 50.

The hydraulic actuator comprises the tubular support 90 integrated in the assembled housing 50 and extending axially in the direction of the torque input disc holder 11. The tubular support 90 is rotationally coupled with the assembled housing 50. The tubular support 90 is in particular arranged to support the double wet clutch mechanism 10. In the example of the second embodiment of the invention, the hydraulic actuator supports the double wet clutch mechanism 10 via a bearing guide 15 arranged on the tubular support 90.

In this example, the clutch mechanism comprises a torque input disc carrier 11, clutches E1, E2 of the multidisc type and the guide bearing 15 arranged radially between the torque input disc carrier 11 and the tubular support 90 of the hydraulic actuator 40.

The guide bearing 15 is a ball bearing which guides the first and second clutches E1, E2 in rotation with respect to the hydraulic actuator 40. The ball bearing 15 bears axially and radially on the input disc holder. torque 11.

Alternatively, the guide bearing may be a needle bearing.

The hydraulic actuator 40 is assembled on the gearbox housing 2 by means of fixing screws. The actuator is supplied with pressurized fluid and coolant via supply lines. Similarly to the first embodiment of the invention, the fluid distribution plate 70 comprises an additional fluid distribution channel 74 extending substantially radially, opening into the central bore 73 and communicating with the orifice additional 84 cooling fluid inlet. The assembled casing 50 thus collects the cooling fluid coming from the casing 2 of the gearbox. The cooling fluid is directed towards the clutch mechanism via the tubular support 90. The tubular support is made in two parts 91, 92 of substantially cylindrical shape, a first outer part 91 bearing on the bore 63 of the actuator body 60 and a second internal part 92 fitted into the first external part 91. A cooling fluid conduit 94 is formed in the free space located between the parts 91, 92.

The cooling fluid pipe 94 therefore extends in part axially and communicates with the additional fluid distribution channel 74, the connection being made at the level of the central bore 73 of the fluid distribution plate 70. Advantageously, the cooling fluid pipe 94 opens on the free end of the tubular support 90 at the level of an oil distribution ring 16. The cooling of the clutch mechanism is thus improved.

Certain parts of the cooling fluid pipe 94 are for example machined in the tubular support 90.

The invention is not limited to the embodiments which have just been described. The casing assembled according to the invention can also be suitable for a hydraulic actuator associated with a cut-off clutch mechanism, of the K0 type used in hybrid transmissions to couple the heat engine to the electric motor after the vehicle start-up phase, or to single or double dry friction clutch mechanisms using, for example, organic friction linings.

Claims (15)

Assembled casing (50) for a clutch mechanism hydraulic actuator, comprising:
- an actuating body (60) of generally cylindrical shape with an axis of revolution (O) comprising a central bore (63) and at least one first annular chamber (61) of average implantation diameter (A) capable of receiving a first actuating piston (41) and pressurized fluid,
- a fluid distribution plate (70) bearing axially on the actuating body (60) comprising at least a first fluid distribution channel (71) communicating with the first annular chamber (61) and a central bore (73 ),
- a closure plate (80) bearing axially on the fluid distribution plate (70), comprising a central bore (83),
said closure plate (80) comprising at least one first fluid inlet orifice (81) oriented along the axis (O) implanted on an implantation diameter (C) greater than the implantation diameter (A)
and the first fluid distribution channel (71) of the fluid distribution plate extending substantially radially and communicating the first annular chamber (61) with the first fluid inlet orifice (81). Housing assembly according to claim 1, in which the actuating body (60) comprises a second annular chamber (62) of average implantation diameter (B) capable of receiving a second actuating piston (42) and pressurized fluid , the diameter (B) being greater than the diameter (A),
and the closure plate has a second fluid inlet orifice (82) oriented along the axis (O) implanted on an implantation diameter (D) greater than the implantation diameter (A),
and the oil distribution plate (70) comprises a second fluid distribution channel (72) extending substantially radially and communicating the second annular chamber (62) with the second fluid inlet orifice (82). Housing assembly according to claim 2, in which the first fluid distribution channel (71) and the second fluid distribution channel (72) are distinct and separated by a sealed wall. Crankcase assembled according to one of claims 1 to 3, in which the closing plate (80) comprises an additional orifice (84) for inlet of cooling fluid oriented along the axis (O) implanted on an implantation diameter (E) greater than the implantation diameter (A) and intended to receive cooling fluid, and the fluid distribution plate (70) comprises an additional fluid distribution channel (74) extending substantially radially, opening into the central bore (73) and communicating with the additional cooling fluid inlet orifice (84). Carter assembled according to the preceding claim, in which the additional fluid distribution channel (74) is distinct from the first fluid distribution channel (71) and from the second fluid distribution channel (72) and separated by a sealed wall. Carter assembly according to claim 4, in which the fluid distribution plate (70) comprises a flat face (75) bearing on the closure plate (80), at least one of the fluid distribution channels (71, 72, 74) extending parallel to this flat face. Housing assembled according to the preceding claim, in which at least one fluid distribution channel (71, 72, 74) opens out continuously along this flat face (75). Carter assembled according to one of claims 6 or 7, in which the fluid distribution plate (70) comprises a groove (76) arranged to receive a seal (51) and formed on the flat face (75), said groove (76) extending along at least one of the fluid distribution channels (71, 72, 74). Housing assembly according to the preceding claim, in which the groove (76) surrounds the fluid distribution channels (71, 72, 74) in a continuous manner. Housing assembly according to any one of the preceding claims, comprising a tubular support (90) concentric with the axis (O), said tubular support (90) jointly penetrating the actuator body, the fluid distribution plate and the plate closure in their central bores (63, 73, 83). Housing assembly according to the preceding claim, in which the tubular support (90) comprises two ends (93, 95), one of the ends (93) is inserted in the closure plate (80) and the other end (95) is free and extends axially beyond the actuator body (60). A housing assembly as claimed in claim 10 taken in combination with claim 4, wherein the tubular support (90) includes a partially axially extending coolant conduit (94) which communicates with the additional fluid distribution channel (74 ), the connection being made at the level of the central bore (73) of the fluid distribution plate, the said cooling fluid pipe (94) opening onto the free end of the tubular support. Carter assembled according to the preceding claim, in which the tubular support (90) is made in two parts (91, 92) of substantially cylindrical shape, a first external part (91) coming to bear on the central bore (63) of the body actuator and a second internal part (92) fitted into the first external part and in which the cooling fluid conduit (94) is formed in a free space located between the first external part and the second internal part. Hydraulic actuator (40) for a clutch mechanism comprising an assembled housing (50) according to any one of the preceding claims and at least one first actuating piston (41, 42) sliding axially in the said at least first annular chamber (61 , 62). Torque transmission system (10) comprising a gearbox casing (2), a clutch mechanism (10) and a hydraulic actuator (40) according to the preceding claim, the hydraulic actuator (40) being fixed to the gearbox casing (2) via the closing plate (80) of the assembled casing (50).