FR3130336A1 - Retaining means for an axial stop ring for a clutch, comprising at least one retaining member - Google Patents

Abstract

Retaining means for an axial locking ring for a clutch, comprising at least one retaining member The invention relates to a clutch (E1) of the multi-disc type for a clutch module (M), comprising: - a clutch plate carrier (13), - a first group of disks (10a, 10b) partly supported by the clutch plate carrier (13) and comprising an end disk (10), the end disc (10) being retained by a first axial stop ring (15), the axial stop ring (15) being inserted in part into a first groove (135) formed in the disc carrier ( 13) clutch, and - retaining means (50) of the axial stop ring, formed either of at least one retaining member (51, 52) additional which, housed at least partly in the axial stop ring (15), is integrally connected to the end disc (10), or at least two retaining members (60, 60') stacked radially closer to the outside diameter (D15) of the ring stop (15) axial. Figure for abstract: FIGURE 1-1

Description

Retaining means for an axial stop ring for a clutch, comprising at least one retaining member

The present invention relates to a clutch of the multi-disc type, a method of assembling such a clutch as well as a clutch module for a vehicle transmission, for example of the hybrid type for which a rotating electrical machine is arranged in the chain. torque transmission.

Each clutch module equipping a transmission chain is rotatable around an axis, and comprises torque input and output means, as well as at least: a multi-disc clutch and an actuator. The actuator further comprises an axially movable piston to exert, selectively depending on its engaged or disengaged configuration, a force on the multi-disc clutch.

Each multi-disc clutch comprises friction discs linked in rotation to a torque output disc carrier, and flanges linked in rotation to a torque input disc carrier. A splined axial portion of the input disc carrier receives the flanges, for example on its outside diameter. This so-called inner disc carrier is also attached to a torque input hub. It is known to stop the axial displacement of the flanges with respect to the friction discs, when they are pressed by the movable piston, thanks in particular to reaction means. Such reaction means, resulting from material with the input disc carrier, nevertheless require substantial dimensions, large thicknesses for the disc carrier. In this case, the actuating axis of the mobile piston is directed towards the inlet disc holder.

But sometimes the actuating axis of the movable piston is directed in the opposite direction to the input disc carrier. In this case, the reaction means can be an added stop ring, of open shape, as illustrated in the document US10520041: the end flange is then stopped by a stop ring mounted on the splined axial portion (already supporting the end flange). From then on, the stop ring is inserted on the inner disc carrier from a housing in the end plate.

But such a snap ring has drawbacks. Under the effect of the rotation of the clutch, in particular at high speeds, the open-shaped locking ring may expand and come out of its housing, with a risk of failure of the clutch during its vehicle operation. The housing of the end plate also requires substantial dimensions, high thicknesses or even significant shrinkage of material to be made within the end plate.

The object of the invention is to respond at least in part to the above problems and also to lead to other advantages, in particular, to improve and guarantee the axial and radial compactness of this solution.

For this purpose, the invention first of all proposes a clutch of the multi-disc type for a clutch module, of axis X and comprising:
- a clutch plate holder,
- a first group of discs supported in part by the clutch disc carrier and comprising an end disc, the end disc being retained by a first axial stop ring, the axial stop ring being inserted partly in a first groove formed in the clutch plate carrier, and
- means for retaining the axial stop ring, formed
either at least one additional retaining member which is at least partly housed in the axial stop ring and is firmly fixed to the end disc,
or at least two retainers stacked radially closer to the outside diameter of the axial stop ring.

The invention proposes, according to a first aspect, a clutch of the multi-disc type for a clutch module, of axis X and comprising:
- a clutch plate holder,
- a first group of discs supported in part by the clutch disc carrier and comprising an end disc, the end disc being retained by a first axial stop ring, the axial stop ring being inserted partly in a first groove formed in the clutch plate carrier, and
- Means for retaining the axial stop ring, formed of at least one additional retaining member which is at least partly housed in the axial stop ring and is fixed integrally to the end disc.

The axial stop ring is prevented, via such retaining means, from expanding and escaping out of the groove of the disc carrier, under the effect of the rotation of the clutch. The anti-rotation of the axial stop ring is ensured by at least one retainer which, inserted into the axial stop ring adapted for this purpose, is then integrally linked to the end disc. The retaining means are thus made simply and as close as possible to the stop ring. Any operation of withdrawals or losses is limited, with a significant economic gain.

Space-saving, stable or close restraints are produced from said ring. The axial retaining ring is held inside the groove for any clutch rotation speed, going for example above 550 rpm. Finally, the assembly and disassembly of such a retaining ring is simplified, in an optimized and compact manner. The stop ring can be reused. The parts to be replaced are limited to the retaining means defined, here to the retaining members linked to the single disc located at the end of the clutch.

According to a characteristic of the first aspect, the retaining means of the axial stop ring can be formed of at least two retaining members spaced angularly from each other, preferably only two retaining members. The angular spacing between two retaining members can be up to sixty degrees, preferably between ten and thirty degrees to bring the two members sufficiently close to each other;

According to an alternative, the means for retaining the axial stop ring can be formed solely of a single member for retaining the axial stop ring. This single retaining member is configured in such a way as to secure the axial stop ring at least in rotation and radially with respect to the end disc.

The invention proposes, according to a second aspect, a clutch of the multi-disc type for a clutch module, of axis X and comprising:
- a clutch plate holder,
- a first group of discs supported in part by the clutch disc carrier and comprising an end disc, the end disc being retained by a first axial stop ring, the axial stop ring being inserted partly in a first groove formed in the clutch plate carrier, and
- Retaining means of the axial stop ring, formed of at least two retainers stacked radially in approximation of the outer diameter of the axial stop ring.

The axial stop ring is prevented, via such retaining means, from expanding and escaping out of the groove of the disc carrier, under the effect of the rotation of the clutch, via a stack of bodies which together contain the axial stop ring from its outside diameter. Any operation of withdrawals, loss of material or parts is limited, with a significant economic gain.

Space-saving, stable or close restraints are produced from outside said ring. The retention of the axial stop ring is ensured inside the groove of the disc carrier, for any speed of rotation of the clutch, going for example beyond 550 rpm. Finally, the assembly and disassembly of such a retaining ring is simplified, in an optimized and compact manner. The stop ring can be reused. The parts are limited to the retaining means defined, in particular here to the retaining members stacked together and located at the end of the clutch discs.

According to a feature of the second aspect, at least one first retainer can be held fixed to the end disc. In particular, the at least one retaining member can rest or abut on a splined portion of the clutch plate carrier, for example on a free end of the splined portion. In addition or alternatively, at least one second member can be held fixed to another component of the clutch, for example to the clutch plate carrier.

According to another characteristic of the second aspect, at least one second retaining member can surround the first axial stop ring, in such a way as to limit its centrifugation, by retaining it radially. The first retainer is then located partly between the axial stop ring and the second retainer.

According to another characteristic of the second aspect, the retaining means can be formed of only two retaining members, ie a first retaining member and a second member retaining member.

The clutch, hereinafter called "first clutch", can be of the wet type. Within the meaning of the present application, a wet clutch is suitable for operating in an oil bath or oil mist;

The clutch plate carrier, subsequently called the first clutch plate carrier, may comprise a splined portion arranged to drive part of the first group of disks in rotation. The first groove is formed on the outer diameter of the splined portion, and can be opened radially outwards.

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

– The first groove, and in particular the axial stop ring, can extend circumferentially in a discontinuous manner around the axis X. The first groove, and in particular the axial stop ring, can be offset axially from the end disc. The end disc here does not cover said groove. The axial stop ring is no longer housed in the end disc, the latter being exempt from housing. We can then simply make the end disc, without over-dimensioning or excessive shrinkage of material.

– The splined portion of the clutch plate carrier may include a particular spline profile defined by an alternation of crest and trough. The recesses of the fluted portion can form the first groove;

– The clutch plate carrier may be an inner plate carrier of the first clutch. The crests or vertices of the fluted portion are adapted to rotate part of the first group of discs.

– The clutch plate carrier may be a torque output plate carrier of the first clutch. The recesses of the fluted portion are adapted to rotate part of the first group of discs;

– The retainer(s) can be of discontinuous shape(s), preferably made
- in the form of rod(s), pawn(s), or any other form of reduced dimension or rotational symmetry, or
- In the form of a staple, or any other segmented form of reduced size.
The latter ensure simple and localized restraints of the axial stop ring;

– According to an alternative, the retaining member(s) can be of circumferentially continuous shape(s), in particular annular, extending in particular over 360 degrees, to surround the ring of axial stop;

– The at least one retainer can be housed in at least one material recess, of the open or closed type, of the axial stop ring;

– Advantageously the retaining means of the axial stop ring can be formed
- a single retainer, preferably housed between two free ends of the axial stop ring, or
- Two angularly spaced retainers, preferably housed in one and the other of the free ends of the axial stop ring; Their number is limited, in order to simply and quickly adjust the production parameters on which depend the operations of fixing the said retainer(s);

– According to an alternative comprising at least two retainers, one of the retainers can be arranged diametrically opposite the other retainer. Said at least two members are then arranged radially on either side of said axial stop ring;

– According to another alternative, the number of retainers can be between three and ten. Thus a third retainer may be arranged diametrically opposite the opening of the axial stop ring, and in particular diametrically opposed to the other two retainers;

– Advantageously the retainers can be of identical shapes. This simplifies their standardization. The retainers may be housed together in a single material recess, or alternatively in a series of material recesses, preferably two in number, spaced apart;

– In an exemplary embodiment, the at least one recess may be of open shape, having an open contour, which opens onto the outside of the axial stop ring. The retainer(s) open(s) onto the outside of the axial stop ring, the latter are housed as close as possible to the outer diameter of the axial stop ring. The advantage is to better absorb the centrifugation force of the axial stop ring;

– As a variant, the at least one recess may be of closed shape, having a closed contour, in the form of a through hole which is made in the axial stop ring. The retainer(s) is (are) integrally nested through said axial stop ring. Any risk of escape or rotation is avoided;

– Advantageously, the axial stop ring can be opened between two free ends, in particular of the split type, from which the at least one retainer is housed. The retaining member is configured in such a way as to make the free ends of the axial stop ring integral with the end disc, at least in rotation. This ring opening ensures that it is fitted in the groove of the clutch plate carrier; The stop ring is prevented from opening and slipping out of the throat of the disc holder, by keeping its ends free;

– The at least one retainer can be accommodated in an opening of the axial stop ring. A single retaining member can bear jointly on the free ends of the axial stop ring, which performs a multitude of functions, including anti-rotation and centering of said ring.
Advantageously, the at least one retaining member, and in particular a single retaining member, may be of a shape complementary to the opening of the axial stop ring;

– According to an exemplary embodiment, a retainer may be housed between the two free ends of the axial stop ring, in particular in the opening of the axial stop ring;

– Alternatively, a retainer may be housed in one of the two free ends of the axial stop ring, in particular in a recess of the axial stop ring;

– The at least one retaining member can be welded to the end disc, preferably by welding carried out by capacitor discharge or by arc or cold. Welding can be done by arc, or cold, or by capacitor discharge. Any other known welding process is possible;

– In addition or alternatively, the at least one retaining member can be housed in the end disc, preferably through a housing of the end disc, in particular by fitting in force, in particular by interlocking or fitting ;

– Advantageously retaining means may also be formed of at least one cavity of the end disc extending at least partly circumferentially, inside which is (are) partly received the organ or organs (s) retainer. Such a configuration makes it possible to make the member(s), and subsequently the axial stop ring, integral at least in rotation with the end disc. In particular, these parts are made integral both in rotation and radially;

– The cavity of the end disc can be of the blind or through type;

– The cavity of the end disc can be of circumferentially discontinuous shape, or alternatively, of annular shape. A discontinuous cavity can form an orifice or any other release of material. The annular cavity of the end disc may extend continuously around the X axis, preferably 360 degrees to accommodate the axial snap ring. The assembly and retention of said ring are improved;

– The cavity of the end disc can be delimited between teeth of the end disc which are adapted to cooperate with the clutch disc carrier;

– According to an exemplary embodiment, the cavity of the end disc can partly house the at least one retainer. The cavity of the end disc can be of the blind or through type;

– Advantageously retaining means may also be formed of at least one splined portion of the clutch plate carrier, on which is (are) partially received the retaining member(s). Such a configuration makes it possible to make the member or members, and subsequently the axial stop ring, integral at least in rotation with respect to the clutch plate carrier to the clutch plate carrier. In particular, these parts are made integral both in rotation and radially;

– Advantageously, retaining means may also be formed of at least one notch in the clutch plate holder, through which is (are) partly received the retaining member(s). Such a configuration makes it possible to make the retaining member(s), and subsequently the axial stop ring, integral at least in rotation with the clutch plate carrier. In particular, these parts are made integral both in rotation and radially;

– Advantageously retaining means can also be formed by the axial stop ring, in particular by being made from the material of the axial stop ring. The latter carries out part of the retaining means himself. The size and the number of organs are limited. According to an exemplary embodiment, retaining means can be formed by a free end of the hook-shaped axial stop ring. This hook can be of a shape adapted to make the axial stop ring integral at least in rotation:
- with the clutch plate carrier, in particular with a tooth, in particular with a hollow or a ridge, or
- With another free end of said axial stop ring, in particular of complementary shapes;

– Advantageously, the at least one retaining member may comprise a pre-centering portion, which is adapted to be received in the end disc, preferably in a cavity of the end disc;

– This pre-centering portion can be produced in the form of a projection, in particular extending in the direction of the end disc, in particular produced by deformation of material, in particular by axial offset of material;

– This pre-centering portion can be made in the form of a recess in the material or a protuberance;

– This pre-centering portion can form a suitable shoulder in the end disc. Any other shape of the retainer is also possible as long as it is adapted to remain inside the cavity of the end disc;

– Advantageously, at least some of the retaining means, and in particular the retaining member or members, can extend from the median diameter of the axial stop ring, or alternatively beyond a median diameter of the axial stop ring. Thus the retainer(s) can extend radially outwards. By median diameter is meant a diameter located substantially in the middle of the axial stop ring, in other words equidistant between the inside and outside diameters of the axial stop ring;

– According to one embodiment, the retainer(s) can be arranged as close as possible to the outer diameter of the axial stop ring, in other words housed from the outer part of the ring. axial stop, which makes it possible to better take up the forces both in rotation and in centrifugation of the stop ring;

– According to an embodiment of the first aspect of the invention, at least some of the retaining means, and in particular the retaining member or members, can be distributed along a center implantation circle on the X axis. Such retaining means are thus located at the same radial distance relative to the axis X. Hence a uniform retention of the axial stop ring;

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

– The first retainer may comprise an annular rim housed radially between the end disc and the axial stop ring, called the first axial stop ring. The annular flange can be arranged radially outside the axial stop ring. This annular rim caps or surrounds the stop ring, in order to retain it radially;

– The annular flange can be obtained by forging and machining, or any other process known to date. The annular rim may be discontinuous. Conversely, the annular flange can be continuous all around the X axis, so as to fill all the available free space of the end disc housing over 360 degrees;

– The first retaining member may comprise an annular central part and an annular peripheral part adapted to retain the first axial stop ring. The annular peripheral part or the annular central part of the retainer is held axially by a clutch component chosen from the end disc or the clutch disc carrier.

– The annular peripheral part may be circumferentially discontinuous. The annular central part may be circumferentially discontinuous; Said first retaining member may further comprise a plurality of connecting arms connecting the annular central part to the annular peripheral part. The link arms can be formed by cutting and folding, or by any other method known to those skilled in the art.

– The link arms can be inserted into notches formed on the free end of the splined portion. The width of the link arms may be substantially equal to the width of the corresponding notches in the clutch plate carrier. Each of the connecting arms has two connection fillets respectively connected to the annular peripheral part and the annular central part.

– In particular, one of the connection fillets of a connecting arm may face the notch of the corresponding splined portion;

– The annular central part can be arranged radially inside the annular peripheral part;

– The annular peripheral part can partly form said annular rim. As a variant, the annular central part may partly form said annular rim. Depending on the case chosen, the annular peripheral part or the central annular part of said retaining member is then inserted partly into the first groove formed in the clutch plate carrier. The other part which is radially opposite (central part or peripheral part) can be fixed axially;

– The at least one retaining member can be elastically deformed to be held axially relative to said component of the first clutch. Its rigidity and its stiffness provide a clamping force on the component of the first clutch which, after its elastic deformation imposed on assembly, maintains the retainer by elastic release. To do this, the retaining member can be elastically widened, during its assembly, using assembly tools, for example pliers;

The subject of the invention, according to another aspect, is a clutch module, comprising: a first clutch which can take up all or part of the characteristics mentioned above, and a second clutch of the multi-disc type, said second clutch comprising:
- a clutch plate holder,
- a second group of discs supported in part by the clutch disc carrier and comprising an end disc, and
- a second axial stop ring of the end disc, partially inserted into a second groove formed in the clutch disc carrier

Such a clutch module may have one or other of the characteristics described below combined with each other or taken independently of each other:

– The clutch module can be of the triple clutch or hybrid clutch type, intended for example to equip vehicles with automated gearboxes. The second clutch can thus be of the wet type;

– The first clutch can be arranged radially beyond the second clutch. The disc carriers of the first clutch and of the second clutch can be arranged radially one above the other;

– The plate carrier of the second clutch can be an outer plate carrier, or alternatively an inner plate carrier, of the second clutch. The second clutch plate carrier may be a second clutch torque input plate carrier. Alternatively, the second clutch disc carrier may be a torque output disc carrier. The second clutch disc carrier may comprise a splined portion arranged to rotate part of the second group of discs, the second groove being formed on the splined portion;

– The disc carrier of the first clutch and the disc carrier of the second clutch can form a common torque input disc carrier, attached one on the other, connected together for example by a weld. Alternatively, the first clutch plate carrier and the second clutch plate carrier may form a common torque input plate carrier, made in one piece. The splined portion of the first clutch may comprise a complementary profile with the splined portion of the second clutch;

– The second axial stop ring can be of open shape, for example of the split type. The second groove may extend circumferentially in a discontinuous manner around the axis X. In particular, the recesses of said splined portion may form the second groove;

– The second groove can be formed on the inside diameter, or alternatively on the outside diameter, of said splined portion. The second groove can be opened radially inwards. The advantage is for the second axial stop ring to remain fixedly housed in the second groove, under the centrifugal effect of the clutch, without the need for restraint. The second groove can be opened radially outwards;

– By way of example, the first retaining member of the first axial stop ring can be retained axially by the disc carrier of the first clutch and/or of the second clutch. Said end disc of the second group of discs may comprise an annular housing inside which the retaining member is partly housed, in order to further limit the axial size of the second clutch;

– By way of example, the first retainer of the axial retaining ring of the first clutch can be retained axially by the axial retaining ring of the second clutch. The retainer may extend radially between the first clutch and the second clutch. Such a configuration offers simple retention of the retaining member at the level of the second clutch, by the second axial stop ring. The mounting of the second axial stop ring comes to axially stop the retainer, so as to prevent it from escaping out of the housing of the end disc, in an optimized and compact manner.
In such a situation, the retaining member of the first axial stop ring is interposed between the second axial stop ring and the end disc of the second group of discs, so as to be maintained axially between the second ring of axial stop and the end disc of the second group. Consequently, the axial supports are formed, at the level of the second clutch, on either side of the retaining member;

– For example, the annular central part can be located at the level of the first clutch. In addition, the annular peripheral part can be located at the level of the second clutch. The link arms may extend axially between the disc carriers of the first and second clutches;

The subject of the invention, according to another aspect, is a method for assembling a clutch, which may take up all or part of the characteristics mentioned above, comprising at least the following steps:
to provide :
- a clutch plate carrier comprising a groove made in a splined portion,
- a group of discs including an end disc,
- an open axial stop ring between two free ends, and
- At least one retaining member of the axial stop ring;
b) inserting the first group of discs on the clutch disc carrier, ending with an end disc connected in rotation with the clutch disc carrier, in particular the end disc then being offset from said groove;
c) insert the axial stop ring in the groove of the clutch plate carrier, in particular
- by tightening the open axial stop ring after having inserted it into the groove of the clutch plate holder, so that it closes at the bottom of the groove, or
- by elastically widening the open axial stop ring before positioning it facing the groove of the clutch plate carrier, then then by elastically releasing the open axial stop ring so that it is housed in said throat ;
d) position the at least one retainer by housing it in the axial stop ring, before binding it fixedly to the end disc or to the clutch disc carrier,
by welding, or by fitting in particular by interlocking or fitting.

According to this method, the assembly steps of the clutch ensure a simple retention of the axial stop ring. The anti-rotation of the axial stop ring is ensured by at least one retaining member which, inserted in the axial stop ring adapted for this purpose, is then fixedly connected in rotation to the end disc or to the clutch plate carrier. Various fixing means are possible, depending on the needs, tool and space available. The retaining means are thus made simply and as close as possible to the stop ring. Any operation of withdrawals or losses is limited, with a significant economic gain.

Space-saving, stable or close restraints are produced from said ring. The axial retaining ring is held inside the groove for any clutch rotation speed, going for example above 550 rpm. Finally, it is possible to simplify the assembly and disassembly of such a stop ring, in an optimized and compact manner. The stop ring can be reused. The parts to be replaced are limited to the retaining means defined, in particular for retainers fitted in force or welded to the single disc located at the end of the clutch.

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

– According to step c), the axial retaining ring can be rigidly tightened using assembly tools, for example pliers. The rigidity and stiffness of the stop ring then provide a tightening force, imposed on assembly, which will then be retained by the retaining weld or by the additional retaining member;

– As a variant according to step c), the axial stop ring can be elastically widened, using assembly tools, for example pliers. The elastic widening, imposed on assembly, then tightens the stop ring inside the groove, by elastic release, in addition to a retaining weld or retaining member;

– According to step d), the at least one retaining member can be solidly linked, being
- welded to the end disc, by a weld without adding material; Or
- firmly mounted in a notch in the clutch plate carrier; and or
- Force-fitted, in particular fitted or housed, in the end disc; and or
- Mounted forcefully together in a space delimited between the end disc and the clutch disc carrier, formed in particular in part by a cavity of the end disc.

– According to step d), the welding can be carried out by friction and then comprises at least the following steps:
- Rotation of the first axial stop ring relative to the end disk or of the end disk relative to the first axial stop ring;
- Bearing and holding under axial pressure of the first axial stop ring on the end disc;
- Relief of pressure support and cooling.

The invention will be better understood, and other aims, details, characteristics and advantages thereof will appear more clearly during the following description of a particular embodiment of the invention, given solely by way of illustration and not limiting, with reference to the appended figures:
– is an exploded perspective of a clutch module comprising a clutch, according to a first embodiment of the invention;
– is a view in axial section of the clutch module, according to the first embodiment illustrated in ;
– is a view in radial section of the clutch module, according to the first embodiment illustrated in ;
– is a variant in radial section of the clutch, according to the first mode illustrated in ;
– is a view in axial section of the clutch module, according to a second embodiment;
– is a view in radial section of the clutch module, according to the second mode illustrated in ;
– is an exploded perspective of the clutch module, according to a third embodiment;
– is a variant in axial section of the clutch module, of the third mode illustrated in ;
– is a view in axial section of the clutch module, according to a fourth embodiment;
– is an axial section of the clutch module, according to a fifth embodiment of the invention;
– is a radial section of the clutch module, according to the fifth mode illustrated in ;
– is an axial section of the clutch module, according to the fifth mode illustrated in ;
– is a variant in axial section of the clutch module, of the fifth embodiment;
– is another variant in axial section of the clutch module, of the fifth embodiment;
– is a radial section of the clutch module, according to a sixth embodiment of the invention;
– is a variant in radial section of the clutch module, of the sixth embodiment;
– is an axial section of the clutch module, according to a seventh embodiment of the invention in which a single retaining member is illustrated;
– is another axial section of the clutch module, similar to the seventh embodiment, in which two retainers are illustrated;
– is another axial section of the clutch module, similar to the seventh embodiment;
– is a perspective of the two retainers, according to the seventh mode illustrated in the ;

By "mobility machine", we mean all motor vehicles, passengers, but also industrial vehicles, in particular heavy goods vehicles, public transport vehicles or agricultural vehicles, or even any transport machine making it possible to pass from one point to other a living being and/or an object. The latter may include a hybrid motorization, an electric motorization and/or low mobility.

Unless otherwise stated, “axially” means parallel to the longitudinal axis X of the clutch; "radially" means along a transverse axis intersecting the longitudinal axis X of the clutch; “angularly” or “circumferentially” means around the longitudinal axis X of the clutch.

In the rest of the description and the claims, certain elements can be indexed, such as: the first ring and the second ring. This is a simple indexing to differentiate and name close but not identical elements. Indexing does not imply a priority of one element over another and one can easily interchange such denominations without departing from the scope of the description.

There is illustrated in Figures 1-1 to 1-4 a first embodiment of the invention. In relation to the , there is such a clutch module M for torque transmission, comprising:
- a torque input element 3 in rotation about an axis X, capable of being coupled in rotation to a crankshaft of a heat engine (not shown but located at the front front of the torque clutch module M );
- A first torque output element 6, adapted to be coupled in rotation to a first torque output shaft A1, in other words the input of a gearbox located at the rear rear of the transmission module M;
- A second torque output element 7, adapted to be coupled in rotation to a second torque output shaft A2, in other words the input of a gearbox located at the rear rear of the clutch module M; And
- A fluid supply hub 80, in particular oil, said main hub.

The module M is formed by a triple clutch, which can be used in the context of the present invention and comprising an input clutch E0, a first output clutch E1 and a second output clutch E2. The first output element 6 is arranged in parallel with the second output element 7 in the direction of torque transmission. Each of these elements rotates around an axis X of rotation of the module M.

The oil supply hub 80 is selectively connected to the torque input element 3 by an input clutch E0, to the first torque output element 6 by a first output clutch E1 and to the second torque output 7 by a second output clutch E2.

Furthermore, the first and second output elements 6, 7 respectively comprise a first and a second web integral in rotation with a first and second hub. The first and second hubs include output interfaces whose inner periphery is splined and capable of cooperating, respectively with a first and a second gearbox shaft.

In addition, the clutch module may include a torsion damper device (not shown) that can be positioned between the heat engine crankshaft and the torque input element 3.

The supply hub 80 further comprises an oil supply channel (not shown) passing through the cylindrical portion 81 and opening into one of the annular cavities. This oil supply channel can be made by drilling successive pipes within the oil supply hub, said pipes being open into each other and arranged to supply pressurized fluid to the clutch control chamber . The fluid can be oil, for example gearbox oil.

Furthermore, the supply hub 80 is coupled in rotation to the torque input element 3, itself coupled to a driving shaft A0 driven in rotation by the crankshaft of an engine, as described above, and that the E0 input clutch is closed, then the main hub 80 is driven by a rotational movement similar to that of the motor shaft. The clutches E0, E1, E2 are each controlled by an actuation system arranged to be able to configure the clutches in any configuration between the engaged configuration and the disengaged configuration.

To selectively control the change of state of the clutches, the control device manages the oil supply. Such a control device is connected to the oil supply hub 80 which includes the fluid passage network 86. Each clutch E0, E1, E2 is associated with an actuation system. Each actuation system also includes:
- a pressure chamber arranged to receive a pressurized fluid;
- a piston 840, 840A, 840B axially movable inside the pressure chamber; And
- A balancing chamber located opposite the pressure chamber relative to the piston 840, 840A, 840B.

Each actuation system is associated with an elastic return element 845, 845A, 845B arranged to generate an axial force opposing the movement of the corresponding piston 840, 840A, 840B to engage the corresponding clutch E0, E1, E2. The elastic return element is a Belleville washer or composed of helical springs, such as the . This makes it possible to automatically return the piston to the disengaged position, corresponding to an open state of the clutch.

In this position, the piston axially releases the corresponding multi-disc assembly which then no longer transmits torque towards the first driven shaft A1 or the second driven shaft A2 of a gearbox (also called input shafts of a gearbox of speed).

Furthermore, the pressure chambers of the actuation systems are arranged to receive a certain volume of pressurized hydraulic fluid in order to generate an axial force on a piston and thus to configure the corresponding clutch in one of the configurations described previously. The actuating piston 840, 840A, 840B of each clutch can be controlled by an internal position sensor coming to control the clutch or by measuring the hydraulic pressure during the closing of the clutch or by measuring the volume of fluid injected or by measuring a quantity of displacement during the closing of the clutch. Each piston is arranged axially between a pressure chamber and a balancing chamber.

Furthermore, the supply hub 80 supplies oil to the input clutch E0, the first output clutch E1 and the second output clutch E2. The Power Hub 80 additionally includes:
- a cylindrical portion, a flange 82 extending radially from the cylindrical portion,
- a closure support extending radially from the flange 82 in the direction of the input element 3. The closure support 83 comprises an electrical connection zone connected to a rotating electrical machine so that the axis of rotation of the electrical machine is offset from the X axis of the M module.
- a first annular cavity arranged on the side of the flange and arranged to receive an actuating piston of the first output clutch E1,
- A second annular cavity disposed on the same side of the flange as the first annular cavity and arranged to receive an actuating piston of the second output clutch E2; And
- A third annular cavity disposed radially beyond the other two annular cavities and arranged to receive an actuating piston of the input clutch E0.

The electrical machine may be a permanent magnet synchronous machine. The electric machine is thus selectively connected to the torque input element 3 by the input clutch E0, to the first torque output element 6 by the first clutch E1 and to the second torque output element 7 by the second clutch E2. In the examples considered, the input clutch E0, the first output clutch E1 and/or the second output clutch E2 are stacked and radially aligned, i.e. there is a fictitious axis orthogonal to the axis of rotation X which passes through the three clutches.

The input clutch E0 is on the outside of the two output clutches E1, E2. The second output clutch E2 is arranged inside with respect to the first output clutch E1. In a variant not shown, the first clutch E1 can be arranged axially next to the second clutch E2. In particular, the input clutch E0, the first clutch E1 and the second output clutch E2 (hereinafter "the clutches") are in the open state called "normally open", selectively actuated in operation by a control (not shown) to go from the open state to the closed state.

Furthermore, the clutches E0, E1, E2 are of the wet type and have between two and seven friction discs. Such multi-disc clutches make it possible to limit the radial height to limit the axial extent.

In particular, the output clutches E1, E2 can be arranged so as not to be simultaneously in the same engaged configuration. On the other hand, they can simultaneously be configured in their disengaged position.

The E0 input clutch, also called "E0 cut-off clutch", further comprises:
- a torque input disc carrier integral in rotation with the first torque input element 3,
- a torque output disc carrier integral in rotation with the supply hub 80, and
- a multi-disc set comprising:
- several friction discs 10b', here two, integral in rotation with a cylindrical edge of the input disc carrier, and
- several plates 10a' respectively arranged on either side of each friction disc 10b', integral in rotation with a cylindrical edge of the output disc holder and friction linings arranged between the plates 10a' and a disc 10b 'Friction, fixed on each side of the friction discs 10b'. The input clutch E0 describes a disengaged position and an engaged position in which said plates and the friction disc pinch the friction linings so as to transmit a torque between the input and output disc carriers.

Similarly, the first output clutch E1 and the second output clutch E2 comprise:
- An input disc carrier 13, 23 integral in rotation with the supply hub 80;
- An output disc carrier 16, 26 integral in rotation with the first output element 6 (for the output clutch E1) or else integral in rotation with the second output element 7 (for the output clutch E2); And
- a multi-disc set comprising:
- several friction discs 10a, 20a, here five discs 10a (for the clutch E1) and four discs 20a (for the clutch E2) integral in rotation with the output disc carrier 20A, 20B,
- several plates 10, 10b, 20, 20b respectively arranged on either side of each friction disc 10a, 20a, integral in rotation with the input disc carrier 13,23 and friction linings arranged between the plates and a friction disc, fixed on each side of the friction discs.

Similarly, the output clutches E1 and E2 describe a disengaged position and an engaged position in which said plates and the friction disc pinch the friction linings so as to transmit a torque between the input disc carrier and the carrier. - corresponding output disc. Commonly to the three clutches E0, E1 and E2, the linings can be fixed on the friction discs, in particular by gluing, riveting or overmoulding. Alternatively, the fittings are attached to the trays.

Each disc holder 13, 23 can synchronize in rotation all of the friction discs 10a, 20a or all of the plates 10, 10b, 20, 20b. Thus each input disc carrier 13, 23 is cylindrical in shape and it comprises a grooved portion 130, 230, having a particular profile of groove, delimited by an alternation of crests and hollows, in order to engage part of the group of the clutch disc E1, E2 respectively, and in particular their teeth 100. Advantageously, the first and second disc carriers 23 form a subassembly of assembled parts, further comprising said supply hub 80 further comprising an annular flange 17, on which the input disc holders 13, 23 are attached.

Advantageously, the input disc holders 13, 23 here form one and the same one-piece piece, made in one piece, as illustrated in the .

The fluted portion 130 of the disc carrier 13 then comprises a profile complementary to that of the fluted portion 230 of the disc carrier 23, reducing the radial bulk. The crests of the splined portion 130 thus form in a complementary manner the hollows of the splined portion 230, and vice versa. In a variant not shown, the disc carriers 13, 23 of the output clutches can be attached one on the other, firmly connected by welding or by interlocking splines. Furthermore, the plates 10, 10b, 20, 20b can be fixed in rotation to the input disc holder 13, 23 and the friction discs 10a, 20a can be fixed to the output disc holder 16, 26. Alternatively not shown, the friction discs can then be integral in rotation with the input disc carrier.

Furthermore, the actuation of the piston 14, 24 causes the axial displacement of the plates 10a, 20a with respect to the friction discs 20a, 20b, for each respective clutch E1, E2, E1, E2, following an engaged configuration. In the examples illustrated, the reaction means of the input clutch E0 is formed on the closure cover 50, here at its radially outer end. These form a single, one-piece piece, extending circumferentially continuously around the X axis.

Furthermore, the reaction means of the output clutches E1, E2 are formed by axial stop rings 15, 25. Each axial stop ring 15, 25 is inserted into a groove 135, 235 which is formed in the splined portion 130, 230 of the disc carrier 13, 23 of the respective clutch E1, E2. The bottom of the grooves 135, 135 is circumferentially discontinuous around the axis X, to receive respectively a first and a second stop ring 15, 25 axially.

Each axial stop ring 15, 25 is annular in shape and open, generally split, in order to be mounted partly in the bottom of said groove 135, 235. The axial stop ring 15 or 25 thus comprises two ends 156 or 256 free, between which are delimited an opening 150 or 250, made in the form of a slot.

Each axial stop ring 15, 25 extends radially between the outer 153 and inner 154 peripheries. Each axial stop ring 15, 25 defines, on the inner periphery here 154, an inside diameter which is housed in the 13, 23 of clutch E1, E2.

Each axial stop ring 15, 25 defines, at the outer periphery here 153, an outer diameter D15, D25 along the X axis. Each axial stop ring 15, 25 can be of constant diameter D15, D25, without variation diameter. The first axial stop ring 15 extends axially between its two side faces 151 and 152, respectively oriented towards the front AV and the rear AR. The thickness E1 is defined between the side faces 151 and 152.

The first group 10a, 10b of discs is stopped, at the level of an end disc 10, by a first axial stop ring 15, which is housed in a first groove 135 of the disc carrier 13. The side face 152 of the axial stop ring 15 is adapted to come into abutment on the side face 101 of the end disc 10.

The second group 20a, 20b of discs is stopped, at an end disc 20, by a second axial stop ring 25, which is housed in a second groove 235 of the disc carrier 23. In particular, the groove 235 of the clutch E2 can be offset axially from the groove 135 of the clutch E1.

Each end disc 10, 20 further comprises a central bore, with an axis center X, for the passage of the elements of the module M including in particular the shafts A1, A2. By way of example, the end discs 10, 20 can be plates 10a, 20a, each linked in rotation to the input disc carrier 13 or 23.

In an embodiment not illustrated, the end discs 10, 20 can be friction discs, which are then linked in rotation to a clutch output disc carrier.

In addition, each end disc 10, 20 may include a thickness Ep which is greater than that of the other clutch discs. The thickness Ep of an end disc 10, 20 is defined between its two side faces 101, 201 and 102, 202 respectively oriented towards the front AV and the rear AR.

Groove 235 is open radially inward, and is formed from inside diameter D23. The second stop ring 25 cannot escape from the second groove, under the centrifugal effect of the clutch E2.

Groove 135 is open radially to the outside, and is formed from outer diameter D13. The groove 135 therefore receives the inner part of the stop ring 15, while the outer part of the axial stop ring 15 remains free. The stop ring 15 then tends to escape, under the centrifugal effect of the clutch E1.

This problem can apply mutatis mutandis to any clutch whose groove, open radially outwards, receives an axial stop ring. To overcome this drawback, retaining means 50 retain the axial stop ring 15 of the first clutch E1, being mounted during or after the latter, to prevent it from escaping from the groove 135.

Advantageously, the retaining means 50 are configured to link the axial stop ring 15 at least in part to the end disc 10, and in particular in certain cases to the clutch disc carrier 13.

Furthermore, the retaining means 50 are formed of at least one retaining member 51, 52, 60, 60', at least in part: housed through the axial stop ring 15, and fixed to the disc of end 10, as shown in Figures 1-1 through 7-3. The retainer(s) 51, 52, 60, 60', here limited to the number of one or two, can extend axially and pass right through the stop ring 15. A retainer 51, 52 has an axial extension strictly greater than the thickness Ep of the stop ring 15.

In the examples illustrated, a retainer 51, 52, 60, 60' is a one-piece, rigid part. Retainer 51, 52 may be discontinuous in shape as shown in Figures 1-1 through 1-6. In particular the retaining member 51, 52 of cylindrical shape, for example in the form of a rod or a pin in fig.1-1 to 1-4.

In the first embodiment, the retaining means 50 are formed solely of a single retaining member 51 which is housed in the axial stop ring 15, in particular through the opening 150, extending axially . In Figures 2-1 to 7-3, the axial stop ring 15 is retained by two retainers 51.

In a variant not shown, the number of retainers can be between three and ten.

In the first embodiment, the end disc 10 is exempt from any shrinkage of material or cavity. Therefore, the stop ring 15 and the first groove 135 are axially offset from the end disc 10.

In the first embodiment, the retainer 51 secures the stop ring 15 to the end disc 10, both in rotation and radially. To do this, the retaining member 51 is of complementary shape to that of the opening 150 of the axial stop ring 15. In other words, the shape of the retainer 51 is adapted to bear jointly on the two free ends 156 of the axial stop ring 15. The retaining member 51 maintains the free ends 156 in an angular position, in other words, by preventing them from moving apart, or alternatively from coming together angularly.

As alternatively illustrated in [Fig. 1-5], the retainer 51 may be of complementary shape to that of the free ends 156. In this situation, the retainer 51 can be segmented, for example in the form of a clip or a hook. Furthermore, the retaining member 51 can be of symmetrical shape, for example having two retaining arms 157 configured in abutment on one and the other of the free ends 156.

In addition, the retainer 51 can be housed in the clutch disc carrier 13, for example in a notch 137 of the disc carrier 13, as illustrated alternatively in [Fig. 1-5]. The retaining member may be of a shape complementary to that of the disc carrier, for example to that of the notch 137.

Furthermore, the retainer(s) 51, 52, 60 may be welded, by a weld 100B which is in particular made from an axial end of said retainer member in contact with the end disc 10.

The 100B weld can be made by capacitor discharge, or in variants, by friction, by arc or cold welding, or by laser welding. This weld 100, 100B can be made end to end jointly, and in particular at the outer diameter D15 of the first axial stop ring 15. In particular, the at least one retainer 51, 52 may comprise an axial end which, resting on the end disc 10, may be coated with a weldable material. For example, a copper coating partially carrying out the welding, in particular by capacitor discharge. Any other coating that partially performs the weld is possible.

Alternatively, the retaining means 50 are formed of only two retaining members 51, 52, as illustrated in the embodiments of Figures 2-1 to 5-4. The retainers 51, 52 are of identical and discontinuous shapes, here pins or pegs.

The retaining members 51, 52 are housed in the stop ring 15, and extend axially through two recesses 155 of material in the stop ring 15. By material recess is meant an additional shape produced by tooling, in particular by drilling, in particular produced throughout the thickness Ep of the axial stop ring. Each recess 155 of material is made in the form of a through hole, through which a retaining member 51, 52 extends in the direction of the end disc 10, in order to then bind them fixedly.

The recesses 155 of material are identical, made in particular from the same tool, and located at the same radial distance relative to the axis X. Each recess 155 receives a retaining member 51 or 52. According to one embodiment not shown, the same recess can receive two retainers.

Advantageously, the recesses 155 of material are each made on one or the other of the free ends 156. The retainers 51, 52 are housed through the free ends 156 of the stop ring.

The recesses 155 of material are spaced apart angularly, according to an angular spacing G, in particular variable, here equal to about twenty degrees. Therefore the retainers 51, 52 are sufficiently close to each other. The recesses 155 of material are distributed at the same radial distance with respect to the axis X. Therefore the retainers 51, 52 are distributed along an implantation circle C1, centered on the axis X.

In the second embodiment illustrated in Figures 2-1 to 2-2, each recess 155 of material is of the open type, having an open contour, here semi-circular, which opens onto the outside of the stop ring 15. The retainers 51, 52 are arranged on the outside diameter D15 of the axial stop ring 15.

By way of example, the implantation circle C1 can be confused with the external diameter D15, or alternatively in the second mode, radially outside the external diameter D15, of the stop ring 15.

In the third embodiment illustrated in Figures 3-1 to 3-2, each recess 155 is of the closed type, having a closed outline preferably oval or circular in shape. Each recess 155 is arranged below the outer diameter D15, in particular closer to the median diameter D3 of the axial stop ring 15.

In this third mode, the retainers 51, 52 are distributed here in the middle of said stop ring 15, in particular along an implantation circle C1 strictly less than the outer diameter D15. The median diameter D3 of said stop ring 15 defines the implantation circle C1.

On the , the recesses 155 are formed as close as possible to the opening 150, on one and the other of the free ends 156. Alternatively on the , the recesses 155 are formed away from the opening 150. The retaining members 51, 52 are then housed outside the two free ends 156. Hence a larger angular spacing G between two retaining members 51, 52, up to sixty degrees.

We will now describe the assembly method, as illustrated for example in the first or the second embodiment. Such an assembly includes, among other things, the following steps:
- According to a first step (a), we provide:
- a clutch plate carrier 13 comprising a groove 135 made in a splined portion 130,
- a group 10a, 10b of discs including an end disc 10,
- an axial stop ring 15 open between two free ends 156, and
- One or two retainers 51, 52 of the axial stop ring;
- According to a second step (b), the group 10a, 10b of discs are stacked on the clutch disc carrier 13, ending with an end disc 10 connected in rotation with the clutch disc carrier 13, in particular the end disc then being offset from said groove 135;
- According to a third step (c), the axial stop ring 15 is housed in the groove 135 of the clutch plate carrier 13, in particular
- by tightening the open axial stop ring 15 after having inserted it into the groove 135 of the clutch plate carrier 13, so that it closes at the bottom of the first groove 135, or
- by elastically widening the open axial stop ring 15 before positioning it facing the first groove 135 of the clutch plate carrier 13, then then elastically releasing the open axial stop ring 15 so that it is housed in said groove 135;
- According to a fourth step (d), the at least one retaining member 51, 52 is positioned before it is fixedly attached to the end disc 10 or to the clutch disc carrier 13 by welding 500B, in particular by housing it in the axial stop ring 15.

In the fourth embodiment illustrated in , the at least one retainer 51, 52 is:
- housed together in the stop ring 15 and the end disc 10,
- housed in at least one cavity 501 of the closed type of the end disc 10,
- mounted in force in the end disc 10, for example nested or fitted in the end disc,

On the , each recess 155 is arranged below the outside diameter D15, in particular near the median diameter D3 of the axial stop ring 15 . The at least one recess 155 and one cavity 501 are arranged axially opposite each other, in particular they are coaxial.

In this fourth mode, the cavity 501 can be made in at least one of the following forms:
- in discontinuous form, inside which is housed a part of the at least one retaining member 51, 52,
- in oval or circular form, in particular in the form of a through hole, inside which a single retaining member 51, 52 can be mounted.

In the fifth embodiment of Figures 5-1 to 5-5, the at least one retainer 51, 52 is:
- housed in at least one cavity 502 of the open type of the end disc 10,
- housed together in the stop ring 15, the end disc 10 and the clutch disc holder 13,
- Force-fitted in the end disc 10, in particular force-fitted together in a space delimited between the end disc 10 and the clutch disc carrier 13.

In this fifth mode, the cavity 502 of the open type has an open contour, which opens onto the inside of the end disk 10. The cavity 502 is at least partly circumferentially discontinuous.

In FIGS. 5-2 to 5-3, the cavity 502 is circumferentially discontinuous, and is formed in part on two immediately adjacent teeth 100 of the end disc 10, and it can receive at least one crest, here only one, of the fluted portion 130. The two retainers 51, 52 are arranged angularly on either side of said ridge. Furthermore, the end disk 10 can comprise a single cavity 501.

In a variant not shown, the cavity 502 can be formed partly on a single tooth of the end disc.

Each retaining member 51, 52 is then force fitted between an edge of the cavity 501 and a portion of said crest. The retainers 51, 52 are arranged in proximity to the disc carrier 13. In addition, the cavity 502 is arranged axially opposite the free ends 156 of the stop ring 15.

Alternatively on the , the end disc 10 further comprises an additional cavity 503, here annular adapted to house the axial stop ring 15 and in particular part of a retaining member 51, 52. In particular, the additional cavity 503 is arranged opposite the groove 135 of the disc carrier 13.

Thus the additional cavity 503 is circumferentially continuous, substantially constant and uniform, obtained by machining, and whose outer wall is dimensioned so that the stop ring 15 can be inserted therein before being partly housed in the groove 135 Its outer wall is circular.

Each cavity 501, 502, 503 opens radially into the central bore of said end disc 10.

Alternatively on the , the at least one retaining member 51, 52 comprises a pre-centering portion, in the form of a projection 15B, which is received in the end disc, preferably in a cavity 502 of the open type. This projection 15B is offset axially from the rest of the retaining member 51, 52, being produced by deformation, in particular here by a depression of material from said retaining member. In particular, the projection 15B forms a shoulder. The discontinuous shape of the cavity 502 is complementary to that of the projection 15B.

In Figure 5-5, recess 155 may extend radially over more than half of retaining ring 15.

In the sixth embodiment illustrated in Figures 6-1 to 6-2, the retaining means 50 are further formed by the stop ring 15 itself. In other words, retaining means 50 are made from the material of the axial stop ring 15, forming a locking means, for example in the form of a hook 157.

In addition, the retaining means 50 are formed of a single recess 155, 158 of material, in particular of closed contour, inside which the retaining member 51 is housed.

On the alternative of , the two free ends 156 of the stop ring 15 are formed of hooks 157 cooperating together, so as to be fixed together, both in rotation and radially. Such hooks 157 are here of complementary shapes.

On the alternative of , the axial stop ring 15 comprises only one free end 156 in the form of a hook 157. Such a hook 157 is here integral in rotation with the disk carrier 13, in particular with a hollow of said disk carrier 13. In other words , with a crest of the disc carrier 23 of the second.

In the seventh embodiment illustrated in FIGS. 7 to 7-3, the means for retaining the axial stop ring are formed of at least one retaining member called the first retaining member 60 which extends radially between the first and second clutches E1, E2;

Advantageously, the first retainer 60:
- crosses at least partly in the disc carriers 13, 23, and/or
- surrounds the first axial stop ring 15, and in particular it can retain the axial stop rings 15, 25, by being mounted after the latter, to prevent them from escaping from their groove 135, 235.

Advantageously, the first retaining member 60 can
- be made in one piece, in particular rigid and/or made of plastic, elastomer or composite material.
- Comprising an annular central part 61 and an annular peripheral part 62, in the form of connecting arms arranged radially outside the annular central part 61, to retain the stop ring 15 axially.

The end disc 10 may be exempt from any material shrinkage or cavity. Solutions then make it possible to keep the first retainer 60 in centrifugation, relative to the end disc 10.

As shown on the , a retainer weld 500B secures the first retainer 60 to the end disc 10. This retainer weld 500B can be made:
- with added material;
- on the outside of the axial stop ring 15;
- Close to the outer diameter D15 of said axial stop ring 15;
- On the side axially opposite that of the end disc 10;

In the alternative of Figures 7-1 to 7-3, the clutch E1 further comprises a second retaining member 60' which surrounds the first retaining member 60. Said at least two retaining members 60, 60' are of continuous, annular, sheet steel lock washer type shapes. Thus the retaining means 50 of the axial stop ring are formed of at least two retaining members 60, 60', here two in number, which are stacked radially one on the other, in approximation of the outer diameter D15 of the axial stop ring 15.

Therefore the retaining weld 500B fixes the two retaining members (60, 60') and it is made close to the end disc 10. The second retaining member 60' is made in the form of a rigid, one-piece ring, and it may be of a shape complementary to that of the first retaining member 60. The second retaining member 60' extends beyond a median diameter D3 of the axial stop ring 15, and preferably being disposed as close as possible to the outside diameter D15 of the axial stop ring.

On the -1, the first retainer 60 is shrunk with the second retainer 60'.

On the alternative of figures 7-2 to 7-3, the first retainer 60 is attached centered and welded to the second member 60'. The second retainer 60' comprises a housing 601 inside which the first retainer 60 is housed.

Advantageously, the second retaining member 60′ may comprise an abutment 602, against which the first retaining member 60 bears. In addition, this stop 602 is configured to receive the outer diameter D15 of the first axial stop ring 15, in order to retain it and prevent it from escaping from its groove 135.

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 dimensions indicated or illustrated may not be to scale and correspond only to a clutch model developed by the applicant. The manufacturing method according to the invention will be adapted as much as necessary to other nominal diameters of the clutch and to other thicknesses or lengths of its retaining members.

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 claim limitation.

Claims (12)

Clutch (E1) of the multi-disc type for a clutch module (M), of axis (X), comprising:
- a clutch disc carrier (13),
- a first group of discs (10a, 10b) supported in part by the clutch disc carrier (13) and comprising an end disc (10), the end disc (10) being retained by a first ring axial stop ring (15), the axial stop ring (15) being partially inserted into a first groove (135) formed in the clutch plate carrier (13), and
- retaining means (50) of the axial stop ring, formed
either at least one retaining member (51, 52) which is at least partly housed in the axial stop ring (15) and fixed integrally to the end disc (10),
or at least two retainers (51, 52) stacked radially close to the outside diameter (D15) of the axial stop ring (15). Clutch (E1) according to Claim 1, in which the retaining member(s) (51, 52) are (are) of discontinuous shape(s), preferably made in the form of a pin( s), peg(s) or staple(s). Clutch (E1) according to Claim 1 or 2, in which the retainer(s) (51, 52) are (are) housed in an opening (150) of the stop ring (15 ) axial or in at least one recess (155, 158, 159) of open or closed type material of the axial stop ring (15), the at least one retaining member (51) preferably being of complementary to the opening of the stop ring (15) axial. Clutch (E1) according to any one of the preceding claims, in which the axial stop ring (15) is open between two free ends (156), from which the at least one retainer (51, 52), the retaining member (51, 52) being configured in such a way as to make the free ends (156) integral with the end disc (10) at least in rotation. Clutch (E1) according to any one of the preceding claims, in which the retaining means (50) of the axial stop ring (15) are formed
- two retaining members (51, 52) spaced apart angularly, preferably housed in one and the other of the free ends (156) of the axial stop ring, or
- A single retainer (51), preferably housed between two free ends (156) of the axial stop ring. Clutch (E1) according to any one of the preceding claims, in which
- the at least one retainer (51, 52) is welded to the end disc (10), preferably by a weld (500B) made by capacitor discharge or by arc or cold, and/or
- the at least one retainer (51, 52) is housed in the end disc (10), preferably by fitting in particular by interlocking or fitting. Clutch (E1) according to any one of the preceding claims, in which retaining means (50) are further formed of at least:
- a cavity (501, 502, 503) of the end disc (10) extending at least in part circumferentially, inside which is (are) partially received the member(s) of retained, in such a way as to make the stop ring (15) axial with respect to the end disc, at least in rotation, and/or
- a splined portion (130) of the clutch plate carrier (13), on which is (are) partly received the retainer(s) (51, 52), in such a way as to make integral at least in rotation with the stop ring (15) axial with respect to the clutch plate carrier, and/or
- a notch (137) of the clutch plate holder (13), through which is (are) partly received the retainer(s) (51, 52) in such a way as to make integral at least in rotation with the stop ring (15) axial with respect to the clutch plate carrier. Clutch (E1) according to any one of the preceding claims, in which
- retaining means are made from the material of the axial stop ring (15), preferably by a free end (156) of the axial stop ring (15) in the form of a hook (157) adapted to make it integral at least in rotation with the clutch plate carrier or with another free end (156) of the axial stop ring, and/or
- the at least one retaining member (51, 52) comprises a pre-centering portion, preferably a recess in the material or a protuberance, which is adapted to be housed in the end disc (10), preferably housed in a cavity (501, 502, 503) of the end disc. Clutch (E1) according to any one of the preceding claims, in which the axial stop ring (15), and in particular the first groove (135), is offset axially from the end disc (10). Clutch (E1) according to any one of the preceding claims, in which at least some of the retaining means, and in particular the retaining member(s) (51, 52, 60'), extend beyond 'a median diameter (D3) of the axial stop ring (15),
preferably by being arranged as close as possible to the outer diameter (D15) of the axial stop ring,
for example by being distributed along an implantation circle (C1) centered on the axis (X). Method of assembling a clutch (E1), comprising at least the following steps:
to provide :
- a clutch plate carrier (13) comprising a groove (135) made in a splined portion (130),
- a group (10a, 10b) of discs including an end disc (10),
- an open axial stop ring (15) between two free ends (156), and
- At least one retainer (51, 52, 60, 70) of the axial stop ring;
b) stacking the group (10a, 10b) of discs on the clutch disc carrier (13) ending with an end disc (10) connected in rotation with the clutch disc carrier (13);
c) housing the axial stop ring (15) in the groove (135) of the clutch plate carrier (13), in particular
- by tightening the open axial stop ring (15) after having inserted it into the groove (135) of the clutch plate carrier (13), so that it closes at the bottom of the first groove (135 ), Or
- by elastically widening the open axial stop ring (15) before positioning it opposite the first groove (135) of the clutch plate carrier (13), then then elastically releasing the stop ring (15) axial open so that it is housed in said groove (135);
d) positioning the at least one retainer (51, 52, 60, 70) by housing it in the axial stop ring (15), before binding it fixedly to the end disc (10) or to the clutch plate carrier (13),
by welding (500B) or by fitting in particular by interlocking or fitting. Method of assembling a clutch (E1) according to the preceding claim, in which the at least one retaining member (51, 52, 60) is integrally connected, being
- Welded to the end disc (10), by a weld (500B) without adding material; Or
- Force-mounted fixedly in a recess (137) of the clutch plate carrier (13); and or
- Force-fitted, in particular fitted or housed, in the end disc (10); and or
- Force-fitted together in a space delimited between the end disc (10) and the clutch disc carrier (13), formed in particular in part of a cavity (502) of the end disc (10).