Member for retaining an axial locking ring of a clutch

Abstract

A multi-plate clutch (E1) comprising: - a clutch plate carrier (13), - a first set of plates (10a, 10b) partially supported by the clutch plate carrier (13) and comprising an end plate (10), - a first axial locking ring (15) partially inserted into a first groove (135) formed in the clutch (E1) plate carrier (13), and - a member (60) for retaining the first axial locking ring (15), said end plate (10) comprising a recess (115, 115') in which a portion of the retaining member (60) is housed, the retaining member (60) being partially located between the first axial locking ring (15) and the annular recess (115, 115') in the end plate (10).

Description

Technical Field

[0001] This invention relates to a multi-plate clutch, and also to a clutch mechanism for a vehicle transmission, such as a hybrid type vehicle transmission, wherein a rotary motor is located in the torque transmission line. Background Technology

[0002] In a known manner, each clutch mechanism capable of rotating about an axis includes a torque input device adapted for coupling to a crankshaft, a torque output shaft, at least one wet multi-plate clutch, and at least one actuator including an axially movable piston, which enables the generation of force to configure the respective multi-plate clutch in an engaged or disengaged configuration. Each multi-plate clutch includes a flange rotatably connected to an inner plate bracket (e.g., forming the torque input device) and a friction disc rotatably connected to an outer plate bracket. The inner plate bracket may include an axially extending portion rigidly connected to the torque input device and arranged to receive, for example, the flange on its outer diameter.

[0003] Known practice is that when the friction disc is pressed by a movable piston, a reaction device, for example, integrally formed with the input disc bracket, is used to stop the axial movement of the plate relative to the friction disc, which requires considerable thickness and size. In this case, the actuating rod of the movable piston faces the input disc bracket.

[0004] Sometimes, the actuating rod of the movable piston faces the opposite direction to the input disc bracket. In this case, the reaction device can be a separate locking ring with an open shape. US10520041 describes a clutch in which the end disc is stopped by a locking ring mounted in an axial extension of an inner disc bracket supporting the end disc. The locking ring can be inserted into the disc bracket from a groove in the disc bracket or a recess in the end disc.

[0005] However, this type of locking ring has drawbacks. Under the action of clutch rotation, especially at high speeds, the open locking ring can expand and dislodge from its groove or recess, posing a risk of clutch failure when the clutch is in operation on the vehicle. Summary of the Invention

[0006] The object of this invention is to overcome at least some of the aforementioned problems and to generate other advantages. In particular, this invention aims to improve existing designs in a simple and efficient manner, while ensuring the axial and radial compactness of the clutch.

[0007] Therefore, according to a first aspect, the present invention provides a multi-disc clutch, comprising:

[0008] - Clutch disc bracket

[0009] - The first set of discs, which is partially supported by the clutch disc bracket and includes the end discs,

[0010] - A first axial locking ring, which is partially inserted into a first groove formed in the clutch disc bracket, and

[0011] - A retaining member for retaining the first axial locking ring, the end plate including a recess in which a portion of the retaining member for retaining the first axial locking ring is received.

[0012] The retaining member is partially located between the first axial locking ring and the recess in the end plate.

[0013] By inserting the retaining member into the recess in the end plate, the first axial locking ring is prevented from expanding and disengaging from the groove in the disc bracket under the action of clutch rotation, and the retaining member is then fixed relative to the end plate of the first set.

[0014] According to the invention, the retaining members are arranged to ensure that the first axial locking ring is held within a groove in the disc holder, particularly within a recess in the end disc, at high clutch speeds, for example, exceeding 550 rpm. The assembly and removal of the first locking ring are simplified in an optimized and compact manner.

[0015] According to a specific embodiment of the first aspect, the present invention provides a multi-disc clutch, comprising:

[0016] - Clutch disc bracket

[0017] - A first set of discs, partially supported by a clutch disc bracket and including an end disc, the end disc including an annular recess, a first axial locking ring of the end disc being received within the annular recess, the first axial locking ring being partially inserted into a first groove formed in the clutch disc bracket, and

[0018] - A component for retaining the first axial locking ring is located partially between the first axial locking ring and the annular recess in the end plate.

[0019] By inserting the retaining member into the annular recess that already accommodates the axial locking ring, the first axial locking ring is prevented from expanding and disengaging from the recess in the end plate under the action of clutch rotation, thereby filling the remaining free space after the first locking ring is assembled.

[0020] According to the invention, the retaining members are arranged to ensure that the first axial locking ring remains within a groove in the disc bracket at high clutch speeds, for example, exceeding 550 rpm. The assembly and removal of the first locking ring are simplified in an optimized and compact manner.

[0021] According to another specific embodiment of the first aspect, the present invention provides a multi-disc clutch, comprising:

[0022] - Clutch disc bracket

[0023] - The first set of discs, which is partially supported by the clutch disc bracket and includes the end discs,

[0024] - A first axial locking ring, which is partially inserted into a first groove formed in the clutch disc bracket, and

[0025] - Components used to retain the first axial locking ring,

[0026] The end plate includes a recess in which a component for retaining the first axial locking ring is accommodated, the component covering the first axial locking ring and being partially accommodated in the recess of the end plate.

[0027] The first axial locking ring is prevented from expanding and disengaging from the groove in the disc holder under the action of clutch rotation. This is achieved by inserting the retaining member into a recess in the end disc provided for this purpose. This recess is designed to receive only the retaining member, and the interior of the recess does not contain the axial locking ring. The size of the recess is reduced, and the amount of material removed from the end disc is also reduced.

[0028] According to the invention, the retaining member is arranged to ensure that the first axial locking ring is held within the groove of the disc bracket, particularly within the recess in the end disc, at high clutch speeds, for example, exceeding 550 rpm.

[0029] The assembly and removal of the first locking ring are simplified in an optimized and compact manner.

[0030] According to the first aspect of the invention, such a clutch, also referred to as a "first clutch," may have one or more of the features described below, either coupled to or independent of each other:

[0031] – The recess in the end plate can be circumferentially continuous, especially annular. The recess can also include an open profile, such as appearing radially inward;

[0032] – As a variation, the recess in the endplate can be circumferentially discontinuous, particularly formed by at least one cut or partial material removal. The recess can also include a closed profile, such as circular, rectangular, or curved;

[0033] – The first clutch may be a wet clutch. Within the meaning of this application, a wet clutch is a clutch capable of operating in an oil bath or oil mist;

[0034] – The clutch disc holder (referred to as the disc holder of the first clutch) may include a spline portion arranged to rotate a portion of the first set of discs, with a first groove formed in the outer diameter of the spline portion. Specifically, the first groove may be radially outwardly open;

[0035] – Preferably, the disc bracket of the first clutch can be the inner disc bracket of the first clutch;

[0036] –The disc bracket of the first clutch can be the torque input disc bracket of the first clutch.

[0037] –As a variation, the disc bracket of the first clutch can be a torque output disc bracket;

[0038] – The spline portion of the first clutch may include a specific spline profile defined by alternating peaks and grooves. The peaks or grooves of the spline portion are capable of rotating a portion of the first set of discs. The grooves of the spline portion may form a first recess;

[0039] –The first groove may extend discontinuously circumferentially around axis X;

[0040] – The first axial locking ring can be open in shape, such as an open retaining ring;

[0041] –The component can extend circumferentially continuously or discontinuously around axis X;

[0042] – The retaining member may include an annular edge radially received between the end plate and the first axial locking ring. Thus, this annular edge covers or surrounds the ring to radially retain the first axial locking ring. The annular edge may be located radially outside the axial locking ring;

[0043] -The annular edge of the retaining component can be accommodated within the recess in the end plate;

[0044] – The annular edge may be obtained by forging or machining, or by any other method known to those skilled in the art;

[0045] – The annular edge can be discontinuous. Conversely, the annular edge can be continuous all around the axis X to fill all available free space in the recess of the end plate in 360 degrees;

[0046] Advantageously, the retaining member may include an annular central portion and an annular peripheral portion capable of retaining the first axial locking ring. The retaining member may also include a plurality of connecting arms connecting the annular central portion to the annular peripheral portion.

[0047] –The central part of the ring can be circumferentially discontinuous;

[0048] –The annular periphery can be circumferentially discontinuous;

[0049] –The central part of the ring can be located radially inside the peripheral part of the ring;

[0050] – The annular peripheral portion may partially form the annular edge. As a variation, the annular central portion may partially form the annular edge. Depending on the choice made, the annular peripheral portion or annular central portion of the retaining member is then partially inserted into a first groove formed in the clutch disc bracket. As a result, the radially opposite portion (central portion or peripheral portion) can be axially fixed;

[0051] – The connecting arm may be formed by cutting and bending, or by any other method known to those skilled in the art;

[0052] – The connecting arm can be inserted into a slot formed in the free end of the spline section. The width of the connecting arm can be approximately equal to the width of the corresponding slot in the clutch disc bracket;

[0053] Each connecting arm has two rounded corners, connecting to the annular periphery and the annular center respectively. Specifically, one of the rounded corners of the connecting arm can face the slot in the corresponding spline portion;

[0054] – The retaining member, particularly at least one of the annular periphery and / or central portion, may include retaining lugs. These are adapted to be received within a recess in the end plate. The number of retaining lugs can range from two to forty, preferably ten to thirty.

[0055] –The lug is radially accommodated between the end plate and the first axial locking ring.

[0056] According to the second aspect, another object of the present invention is a clutch according to any of the foregoing features, wherein the retaining member is axially held by the components of the clutch.

[0057] According to the second aspect, the advantage is that it ensures alignment with the first clutch located near the retaining member. This clutch component can be selected, for example, from the clutch disc bracket or the end plate of the first set of discs, thereby limiting the number of parts and ensuring optimal compactness.

[0058] The second aspect of the invention may have one or more of the features described below, either in combination with or independently of each other:

[0059] -Advantageously, the annular periphery or annular center of the retaining member is axially held by the components of the first clutch;

[0060] – The retaining member can elastically deform to maintain axial hold relative to the component of the first clutch. Its rigidity and stiffness provide clamping force on the component of the first clutch, which retains the retaining member by elastic release after its elastic deformation is applied to the assembly. For this purpose, the retaining member can be elastically expanded during assembly using an assembly tool (e.g., pliers).

[0061] – In a first case, the end plate of the first group may include an annular cavity in which the annular periphery of the retaining member is received. The annular cavity is positioned radially beyond an annular recess, which partially includes a first axial locking ring and an annular central portion of the retaining member. The advantage of this annular periphery is that it is axially held by the end plate.

[0062] – In this particular case, the width of the annular cavity can be adjusted to accommodate the width of the annular periphery;

[0063] – In the second case, the axial support of the retaining member can be located on either side of the end plate of the first group. The annular periphery and center of the retaining member can be supported on the end plate and positioned to be axially supported on either side of the end plate;

[0064] – For example, the annular periphery of the retaining member may be partially located within an annular recess in the end plate. Consequently, the annular center portion may be supported on a lateral surface of the end plate opposite the annular recess. In this way, the annular periphery and center portion are supported on either side of the end plate, thereby keeping the retaining member fixed relative to the first set of end plates;

[0065] –In particular, the retaining member can extend radially below the end plate, passing through the free end of the spline portion via a slot;

[0066] – In the third case, the annular center portion of the retaining member can be supported on or against the spline portion of the clutch disc bracket, for example, at the free end of the spline portion.

[0067] According to a third aspect, another object of the present invention is a clutch mechanism comprising a first clutch and a second multi-plate clutch according to a first aspect, wherein the second clutch comprises:

[0068] - Clutch disc bracket

[0069] - The second set of discs, which is partially supported by the clutch disc bracket and includes end discs, and

[0070] - The second axial locking ring of the end plate is partially inserted into a second groove formed in the clutch disc bracket, wherein the retaining member of the first axial locking ring is axially held by the second axial locking ring.

[0071] According to the present invention, the advantage of this construction is that it ensures that the retaining member is easily kept aligned with the second clutch by the second axial locking ring under rotation.

[0072] According to the third aspect, the second axial locking ring is assembled in an optimized and compact manner to axially stop the retaining member, thereby preventing it from disengaging from the recess in the end plate.

[0073] Advantageously, the member for retaining the first axial locking ring is inserted between the end plates of the second axial locking ring and the second set of discs, such that it is axially held between the second axial locking ring and the end plates of the second set of discs. As a result, axial supports are formed on both sides of the retaining member, aligned with the second clutch.

[0074] The third aspect of the invention may have one or more of the features described below, either in combination with each other or independently of each other:

[0075] -Advantageously, the clutch mechanism can be a triple clutch or a wet clutch type, for example, suitable for installation on vehicles with semi-automatic gearboxes;

[0076] – The first clutch can be positioned radially above the second clutch. The disc brackets for the first and second clutches can be positioned radially above each other;

[0077] – Preferably, the disc bracket of the second clutch can be the outer disc bracket of the second clutch. As a variation, the disc bracket of the second clutch can be the inner disc bracket of the second clutch;

[0078] –The disc bracket for the second clutch can be the torque input disc bracket for the second clutch.

[0079] As a variation, the disc bracket of the second clutch can be a torque output disc bracket;

[0080] –The retaining member can extend radially between the first clutch and the second clutch;

[0081] – Preferably, the annular center portion can be positioned to align with the first clutch;

[0082] –In addition, the annular peripheral portion can be aligned with the second clutch;

[0083] – The connecting arm can extend axially between the disc brackets of the first and second clutches;

[0084] –The disc bracket of the second clutch may include a spline portion arranged to rotate part of the second set of discs, and a second groove is formed in the spline portion;

[0085] – Preferably, the second groove can be formed on the inner diameter of the spline portion;

[0086] – The second groove can open radially inward. The advantage is that, under the centrifugal force of the clutch, the second axial locking ring remains fixedly accommodated in the second groove, without needing to be held in place;

[0087] –In particular, the disc bracket of the second clutch can be an outer disc bracket;

[0088] –As a variation, a second groove may be formed on the outer diameter of the spline portion;

[0089] –The second groove can open radially outward;

[0090] –In particular, the disc bracket of the second clutch can be an inner disc bracket;

[0091] –The disc bracket for the second clutch can be a torque input disc bracket;

[0092] As a variation, the disc bracket of the second clutch can be a torque output disc bracket;

[0093] – The disc brackets of the first clutch and the disc brackets of the second clutch can form a common torque input disc bracket that is attached to each other, for example, by welding them together;

[0094] –As a variant, the disc bracket of the first clutch and the disc bracket of the second clutch can be formed into a common torque input disc bracket that is manufactured as a single piece.

[0095] -Advantageously, the spline portion of the first clutch may include a profile complementary to the spline portion of the second clutch;

[0096] –The end plate of the second set of discs may include an annular recess, in which the retaining member is partially accommodated, so as to further limit the axial space occupied by the second clutch;

[0097] – The second axial locking ring can have an open shape, such as a second open retaining ring;

[0098] – The spline portion may include a specific spline profile defined by alternating peaks and grooves. The peaks of the spline portion enable a portion of the second set of disks to rotate;

[0099] – The second groove may extend discontinuously circumferentially around the axis X. Specifically, the groove in the spline portion may form the second groove;

[0100] – The second clutch can be a wet clutch.

[0101] According to the fourth aspect, another object of the present invention is a method for assembling a first clutch, the first clutch having all or some of the foregoing features, comprising at least the following steps:

[0102] a) Provide for the first clutch:

[0103] - A first tray, having a rotation axis X and including a first groove.

[0104] - The first set of disks, whose end disks include annular or discontinuous recesses.

[0105] - First axial locking ring and retaining member;

[0106] b) Alternately stack the first set of trays, which are partially supported by the first tray bracket, ending with the end trays supported by the first tray bracket;

[0107] c)d) Before partially receiving the first axial locking ring in the first groove in the first disc bracket, insert it into the recess in the end disc of the first set; then insert a portion of the retaining member into the remaining free space in the recess in the end disc of the first set;

[0108] or

[0109] c')d') The first axial locking ring is partially received in the first groove in the first disc bracket; then a portion of the retaining member is inserted into the recess in the end disc of the first set.

[0110] According to a specific embodiment of the fourth aspect, the present invention particularly relates to a method for assembling a first clutch, which may have all or some of the foregoing features, comprising at least the following steps:

[0111] a) Provide for the first clutch:

[0112] - A first tray, having a rotation axis X and including a first groove.

[0113] - The first set of disks, whose end disks include annular recesses.

[0114] - First axial locking ring and retaining member;

[0115] b) Alternately stack the first group of trays, which are partially supported by the first tray bracket, ending with the end tray supported by the first tray bracket;

[0116] c) Insert the first axial locking ring into the annular recess in the end disc of the first set before partially receiving the first axial locking ring in the first recess in the first disc bracket;

[0117] d) Insert a portion of the retaining member into the remaining free space within the annular recess in the end plate of the first group.

[0118] According to this method, the assembly of the clutch simply ensures the retention of the axial locking ring. The assembling of the retaining member fills the space that remains empty after the first axial locking ring is assembled into the annular recess. Removal is simple and feasible by pulling the retaining member out of the annular recess.

[0119] Here, the annular recess in the end plate is positioned facing the groove in the plate holder. The axial locking ring is then accessed through the inlet of the annular recess into the groove in the plate holder for assembly and removal. According to steps b) and c), the axial locking ring is jointly positioned in the groove and the annular recess.

[0120] In another specific embodiment of the fourth aspect, the invention particularly relates to a method for assembling a first clutch having all or some of the foregoing features, comprising at least the following steps:

[0121] a) Provide for the first clutch:

[0122] - A first tray, having a rotation axis X and including a first groove.

[0123] - The first set of discs, whose end discs include recesses.

[0124] - First axial locking ring and retaining member;

[0125] b) Alternately stack the first group of trays, which are partially supported by the first tray bracket, ending with the end tray supported by the first tray bracket;

[0126] c') Insert the first axial locking ring into the first groove in the first disc bracket;

[0127] d') Insert a portion of the retaining member into the recess in the end plate of the first group.

[0128] According to this method, the assembly of the clutch simply ensures the retention of the axial locking ring. The first axial locking ring is fitted into a groove and then held by a retaining member, which itself is fitted and held in a recess in an end plate provided for this purpose. Removal is simple and feasible by pulling the retaining member out of the recess.

[0129] Here, the recess in the end plate is axially offset from the groove in the plate holder. For the assembly and removal of the axial locking ring, access to the groove in the plate holder is achieved independently of the annular recess. According to these steps, the axial locking ring is assembled in the groove, and the annular recess receives only the retaining member.

[0130] According to a fifth aspect, another object of the present invention is a method for assembling a clutch mechanism, the method comprising the aforementioned four steps for assembling a first clutch E1, and further comprising the following steps:

[0131] e) Provide for the second clutch:

[0132] - A second tray, having a rotation axis X and including a second groove.

[0133] -Including the second set of trays at the end;

[0134] f) For the second clutch, the second set of discs, which are partially supported by the second disc bracket, are alternately stacked, ending with the end disc supported by the second disc bracket;

[0135] g) Place another part of the retaining member so that it is axially supported on the end plate of the second group;

[0136] h) Place the second axial locking ring such that it is axially supported on the end plate of the second set, and then partially accommodate the second axial locking ring in the second groove in the second plate bracket.

[0137] According to this method, the step of assembling the second clutch simply ensures that the retaining member for holding the first axial locking member is maintained. After step g) of placing the retaining member to support it, assembling the second axial locking ring ensures that the retaining member is axially aligned with the second clutch.

[0138] The retention is further optimized by inserting the retaining member between the end plate of the second set and the second axial locking ring. The first axial locking ring can also be easily removed by sequentially pulling out the second axial locking ring from the annular recess and then pulling out the retaining member.

[0139] According to a sixth aspect, the present invention also provides a multi-disc clutch, comprising:

[0140] - Clutch disc bracket, and

[0141] - A first set of discs, partially supported by a clutch disc bracket and including an end disc, the end disc including an annular recess, wherein the outer periphery of the recess is defined by a radially variable outer diameter, and a first axial locking ring of the end disc is received within the recess, the first axial locking ring being partially inserted into a first groove formed in the clutch disc bracket.

[0142] The first axial locking ring includes a retaining device formed on the end of the ring, which interacts with the recess portion according to the change ΔD of the outer diameter of the outer periphery.

[0143] According to the sixth aspect, the retaining device interacts with the radially variable outer periphery of the annular recess. This prevents the first axial locking ring from expanding at high clutch speeds, for example, exceeding 550 rpm. The axial locking ring is held within the annular recess in the end plate. The annular recess has a non-circular profile obtained through machining, and its outer diameter is variable.

[0144] After assembly, the available free space between the first axial locking ring and the annular recess is reduced to a minimum. The retaining device interacts with the minimum outer diameter of the recess; in other words, it interacts with the minimum outer diameter region of the annular recess.

[0145] The sixth aspect of the invention may have one or more of the following features, either in combination with each other or independently of each other:

[0146] – The annular recess may be defined by a radially variable outer diameter, the annular recess comprising a maximum diameter region Da and a minimum diameter region Db. Depending on the variation ΔD, the outer diameter of the annular recess may extend radially between a maximum diameter, referred to as the “maximum diameter Da” of the annular recess, and a minimum diameter, referred to as the “minimum diameter Db” of the annular recess;

[0147] -Advantageously, the shape of the minimum diameter region Db is complementary to the shape of the first axial locking ring, and more specifically, to the shape of the retaining device;

[0148] – The first axial locking ring may include a retaining device that interacts with the recess portion according to the change in the outer diameter ΔD of the outer periphery. Preferably, the retaining device may interact with the minimum diameter region Db of the annular recess;

[0149] –The retaining device can protrude radially to the outside of the first axial locking ring;

[0150] – For example, the first axial locking ring may have an open shape. As a result, at least one of these ends may include a locking lug that forms a retaining device for the first axial locking ring. The first axial locking ring may include two locking lugs forming the retaining device of the first axial locking ring;

[0151] – Alternatively, the retaining device may be formed by the circumferential wave of the first axial locking ring, uniformly spaced at an angle, and they interact with the outer diameter of the annular recess. Alternatively, the retaining device may be a curved branch of the first axial locking ring;

[0152] - Each locking protrusion can protrude radially toward the outer diameter of the annular recess;

[0153] Each locking lug may include a hole in which the end of an assembly tool (e.g., pliers) can be received. This facilitates the elastic separation of the two ends of the first axial locking ring before it is released to receive it in the first groove of the first disc holder when the first axial locking ring is assembled into the recess.

[0154] According to the seventh aspect, the present invention also provides a method for assembling a first clutch according to the sixth aspect, comprising at least the following steps:

[0155] a) Provide:

[0156] -Including the first disc bracket with the first recess.

[0157] - The first set of disks, the end disks of which include annular recesses defined by radially variable outer diameters, the annular recesses including a maximum diameter region and a minimum diameter region.

[0158] - First axial locking ring

[0159] b) Insert the first set of trays into the first tray holder, ending with an end tray rotatably connected to the first tray holder.

[0160] c) Elastically expand the first axial locking ring and then insert it into the annular recess in the maximum diameter region.

[0161] d) The first axial locking ring is elastically released so that it is received in a first groove in the first disc bracket, and

[0162] e) Pivot the first axial locking ring to position it in the minimum diameter area of ​​the annular recess.

[0163] According to the seventh aspect, by rotating the first locking ring, the assembly process simply ensures its retention at high clutch speeds, such as above 550 rpm. This reduces and simplifies assembly and removal steps. Rotating the axial locking ring allows the retaining device to interact with the minimum diameter area of ​​the annular recess.

[0164] According to steps c) and d), the axial locking ring is received in a groove in the disc holder. An assembly tool, such as pliers, is used to separate the locking ring, which is received in a hole in the locking cam. Attached Figure Description

[0165] The invention will be better understood from the following description of specific embodiments thereof, with reference to the accompanying drawings, and further objects, details, features and advantages thereof will become clearer. The following description is given by way of non-limiting illustration only:

[0166] Figure 1 This is an axial sectional view of the clutch mechanism according to the first embodiment of the present invention;

[0167] Figure 2 It is based on Figure 1 An exploded perspective view of the clutch mechanism of the first embodiment shown;

[0168] Figure 3 It is based on Figure 1 Another exploded perspective view of the clutch mechanism of the first embodiment shown;

[0169] Figure 4 It is based on Figure 1 Another detailed perspective view of the clutch mechanism of the first embodiment shown;

[0170] Figure 5 This is an axial sectional view of the first clutch according to a second embodiment of the present invention;

[0171] Figure 6 This is an axial sectional view of the first clutch according to the third embodiment of the present invention;

[0172] Figure 7This is another axial sectional view of the first clutch according to the fourth embodiment of the present invention;

[0173] Figure 8 This is an axial sectional view of the clutch mechanism according to the fifth embodiment of the present invention;

[0174] Figure 9 This is an axial sectional view of the clutch mechanism according to the sixth embodiment of the present invention;

[0175] Figure 10 It is based on Figure 9 Detailed view of the clutch mechanism of the sixth embodiment shown;

[0176] Figure 11 It is based on Figure 9 Detailed view of the retaining member of the sixth embodiment shown;

[0177] Figure 12 It is based on Figure 9 A perspective view of the retaining member of the sixth embodiment shown. Detailed Implementation

[0178] "Vehicle" means motor vehicles, including not only passenger vehicles but also industrial vehicles, especially heavy-duty trucks, public transport vehicles and agricultural vehicles, as well as any transport unit capable of transporting living things and / or objects between locations.

[0179] In the following description and claims, by way of non-limiting example and for ease of understanding, the terms “front” or “rear” will be used according to the direction of the axial orientation determined by the rotational main axis X of the motor vehicle transmission, and the terms “inner” or “outer” will be used relative to the axis X and according to a radial orientation orthogonal to the axial orientation.

[0180] Unless otherwise stated,

[0181] "Axial axis" refers to "the axis of rotation X parallel to the balance cover or the dual clutch";

[0182] "Radial" refers to "the transverse axis that intersects the rotation axis of the wet dual clutch";

[0183] "Angled" or "circumferential" refers to "around the rotation axis X of the clutch mechanism".

[0184] Here, the thickness is measured along the axis of rotation X. Unless otherwise stated, the verbs “including,” “having,” or “containing” must be interpreted broadly, i.e., non-restrictively.

[0185] Figures 1 to 4A first embodiment of the clutch mechanism 1 is shown, which has a dual clutch for a vehicle transmission. This dual clutch is shown within the torque transmission line of a motor vehicle via a gearbox housing with two driven torque output shafts A1 and A2. In a variant not shown, the clutch mechanism 1 may be a single clutch.

[0186] Mechanism 1 includes a first clutch E1 and a second clutch E2, both of which are multi-disc type. They are controlled to selectively connect the internal combustion engine and the rotary electric motor M to the first driven shaft A1 and the second driven shaft A2. Then, the torque from the internal combustion engine and the electric motor can be transmitted to the coaxial gearbox shafts A1 and A2 depending on the engagement of one or the other of the first clutch E1 and the second clutch E2.

[0187] When the first clutch E1 is engaged, the first driven shaft A1 rotates; when the second clutch E2 is engaged, the second driven shaft A2 rotates. The first and second clutches E1 and E2 are positioned radially, one above the other.

[0188] In the example shown, the first clutch E1 is radially positioned above the second clutch E2. As a variant not shown, the first clutch E1 may be axially positioned next to the second clutch E2.

[0189] Mechanism 1 includes at least one torque input element 2 about its axis of rotation X, which is rotatably connected to a drive shaft (not shown). Input element 2 is located at the front of dual-clutch mechanism 1. The generally L-shaped input element 2 includes a radially oriented portion formed by a torque input web 3 and an axially oriented portion formed by a torque input hub 4.

[0190] The web 3 and hub 4 are rigidly connected to each other and fastened together by welding. The torque input hub 4 is rotatably guided within the housing 200, which is fixed relative to the torque transmission line.

[0191] Mechanism 1 can be a hybrid clutch, suitable for installation on automatic, semi-automatic, hybrid, and / or electric transmissions in motor vehicles. For example... Figure 2 and 8 As shown in the example in section 9, mechanism 1 can be a triple clutch E1, E2, and E3, and also includes a third clutch E3, which is rotatably connected to the input web 3 and clutches E1 and E2. The torque input hub 4 is rotatably connected, for example, by a spline formed at the output of a damping device (such as a dual-mass flywheel), the input of which is connected to a drive shaft formed by a crankshaft, particularly via an engine flywheel, the crankshaft being rotated by an internal combustion engine provided in the vehicle.

[0192] The clutch mechanism 1 is wet and can operate in an oil bath and / or oil mist. Mechanism 1 is hydraulically controlled by pressurized fluid (usually oil).

[0193] To selectively control the state changes of the first clutch E1 and the second clutch E2, the control unit of mechanism 1 manages the supply of pressurized oil in a separate control chamber. The control unit is typically integrated into the gearbox housing.

[0194] The control unit is supported and connected to the central hub 50. The central hub 50 is adapted to transmit torque from two independent sources (i.e., combustion and electricity).

[0195] like Figure 1 As shown, the center hub 50 includes pressurized oil supply channels 54a and 54c, so that the center hub 50 can supply oil to the first clutch E1 and the second clutch E2.

[0196] As is known in the operation of wet clutches E1 and E2, balance chambers 31 and 41 are associated with each control chamber 32 and 42. Typically, the balance chambers are axially positioned next to the annular cavity that serves as the control chamber.

[0197] In the illustrated example, the central oil supply hub 50 includes:

[0198] - Cylindrical portion 55 with axis X,

[0199] -Flange 53 extending radially from cylindrical portion 55

[0200] - A first annular cavity 51, located on the same side as the flange, is arranged to receive the first actuating piston 14 of the first clutch E1.

[0201] - The second annular cavity 52, located on the same flange side as the first annular cavity, is arranged to receive the second actuating piston 24 of the second clutch E2.

[0202] Oil supply passages 54a, 54b and 54c pass through cylindrical portion 55 and flange 53 and enter annular cavity, particularly within balance chamber 31 of first clutch E1.

[0203] An oil supply passage 54a machined in the center hub 50 is associated with the control chamber of the second clutch E2. The oil supply passage 54a is formed by drilling continuous axial and radial conduits within the center hub 50. The conduits enter each other and are arranged to supply pressurized fluid to the control chamber of the second clutch E2. An oil supply passage 54b enters a second annular cavity 52 formed directly in the center hub 50. The annular cavities 51 and 52 of clutches E1 and E2 are oriented in the same direction, in this example towards the drive shaft and towards the internal combustion engine of the torque transmission line.

[0204] The first chamber 51 and the second chamber 52 are radially nested one on top of the other. The first balance chamber 31 of the first clutch is axially positioned next to the first chamber 51. The second balance chamber 41 of the second clutch is axially positioned next to the second chamber 52. The multi-disc assembly of the second clutch E2 is radially positioned between the first and second chambers. Therefore, the available internal space inside the wet dual clutch can be used, thereby reducing the axial space occupied.

[0205] The first clutch E1 is actuated by a first actuating piston 14, the movement of which is controlled by a control chamber 32, with a balance chamber 31 associated with the control chamber 32. The actuating piston 14 of the first clutch E1 is axially movable between a disengaged position and an engaged position, corresponding to the disengaged and engaged states of the first clutch E1, respectively, in that direction from rear to front. The multi-disc assembly of the first clutch E1 is directly actuated by the first actuating piston 14. The movement of the first actuating piston 14 is controlled by the control chamber 32, defined by a first chamber 51. Similarly, the movement of the second actuating piston 24 is controlled by a control chamber 42, defined by a second chamber 52. Therefore, the control chambers 32 and 42 of the first clutch E1 and the second clutch E2 are positioned as close as possible to the central oil supply hub to reduce leakage within the wet dual clutch.

[0206] The second clutch E2 is actuated by a second actuating piston 24, the movement of which is controlled by a control chamber 42, with a balance chamber 41 associated with the control chamber 42. The actuating piston 24 of the second clutch E2 can move axially between a disengaged position and an engaged position, corresponding to the disengaged and engaged states of the second clutch E2, respectively, in this case, from back to front.

[0207] The multi-disc assembly of the second clutch E2 is directly actuated by a second actuating piston 24 made of a pressed metal plate. The second actuating piston 24 is axially movable relative to the second annular cavity 52 of the central hub 50. Similarly, the free end of the second actuating piston 24 of the second clutch E2, supported on the multi-disc assembly, is radially positioned between a first cavity 51 and a second cavity 52, oriented towards the drive shaft. The cylindrical portion 55 of the central hub extends axially away from the drive shaft. The balance chambers 31 and 41 are supplied with coolant.

[0208] The cylindrical portion includes oil supply channels 54a, 54b, and 54c for the first cavity 51, the second cavity 52, and the balance chambers 31 and 41. Coolant is supplied via an oil supply channel 54b, separate from the other oil supply channels 54a and 54c. This oil supply channel 54b is also formed in the central oil supply hub 50. The oil supply channels 54a, 54b, and 54c are angled around the cylindrical portion 55. Preferably, the central hub 50 collectively supports the first and second clutches, for example, on the cylindrical portion 55 or the flange 53. Each oil supply channel 54a, 54b, and 54c includes generally radial and axial perforations oriented toward the control chambers of the first and second clutches E1 and E2, and toward the balance chambers 31 and 32 of the first and second clutches E1 and E2. The oil supply channels 54a, 54b, and 54c of the first cavity 51, the second cavity 52, and the first balance chamber 31 are angled around the axis of rotation X and radially pass through the flange 53.

[0209] For example, an oil supply passage 54c, axially located at the rear end of the center hub 50, is associated with the control chamber 42 of the first clutch E1. The oil supply passage 54c is formed by drilling continuous axial and radial conduits within the center hub 50. The conduits intersect each other and are arranged to supply pressurized fluid to the control chamber 32 of the first clutch E1. Each Figure 1 , 9 An oil supply passage 54b, machined in the center hub 50 and associated with the balance chamber of the first clutch E1, is shown. In this example, the oil supply passage 54b is shared with the oil supply passage of the balance chamber 31 of the second clutch E2. The oil supply passage 54b is formed by drilling continuous axial and radial channels within the center hub 50.

[0210] The first balance chamber 31 is partially defined by the balance cover 70 (preferably an annular or cylindrical component) of the first clutch E1 to form a closed chamber into which the passage 54b enters. The balance cover 70 is radially located between the first actuating piston 14 and the second actuating piston 24. The balance cover 70 of the first clutch E1 and the first actuating piston 14 together form the balance chamber 31 of the first clutch. The balance cover is specifically arranged to interact with the first actuating piston 14 by sliding. The balance cover 70 is radially located above the multi-disc assembly of the second clutch E2.

[0211] exist Figure 1 and 9 In the middle, the balance cover 70 also includes an annular or cylindrical skirt 76, which partially defines the balance chamber 31 of the first clutch E1.

[0212] The resilient return element 40 (e.g., a spring washer or resilient return device) of the first actuating piston 14 is supported on or formed together with the balance cover 70, and its function is to automatically return the first actuating piston 14 to the disengaged position corresponding to the clutch disengagement state. The resilient return element 40 includes a series of helical springs 41, which are supported on the first actuating piston 14 by a first annular support plate and are axially inserted between the front wall of the first actuating piston 14 and the annular surface of the balance chamber.

[0213] Therefore, the first support plate supports a series of springs 41 and pushes the first piston 14 back by applying an axial compressive force. Conversely, the balance cover 70 supports the helical springs 41 of the first piston 14, here via a second plate, which itself is supported on the balance cover 70, and the balance cover 70 is pressed by the springs 41. To ensure optimal operation, the balance chamber 31 is sealed by a seal, including a seal 90 on the balance cover 70, which rubs against the cylindrical portion of the first piston 14. The skirt 76 of the balance cover 70 includes a seal 90 on its outer periphery 74, which is here overmolded.

[0214] The two clutches E1 and E2 include a first torque input disc bracket 13, referred to as the first clutch E1, and a second torque input disc bracket 23, referred to as the second clutch E2. They are kinematically connected to the internal combustion engine and rotatably connected to the input web 3. Here, the rotatable connection with the input web 3 is achieved by welding, but it can also be achieved by interlocking splines.

[0215] The first torque input disc bracket 13 is arranged to partially receive the multi-disc assembly of the first clutch E1, referred to as the first set of discs 10a, 10b. The first disc bracket 13 includes a spline portion 130 that partially engages with the first set of discs 10a, 10b, having a specific spline profile.

[0216] The profile of the spline portion 130 is defined by alternating peaks 131 and grooves 132. In the example shown, the peaks 131 cause the plates 10a of the first set 10a, 10b to rotate.

[0217] The first set of discs 10a, 10b includes a plate 10a rotatably connected to a first disc holder 13, and a friction disc 10b rotatably connected to an output disc holder 16. The friction disc 10b is axially inserted individually between two consecutive plates 10a.

[0218] The output disc bracket 16 of the first clutch E1 is rotatably connected by meshing with the friction disc 10b and by a spline connection with the first driven shaft A1. The output disc bracket 16 is generally L-shaped, with its inner diameter rigidly connected to the splined output hub at its end.

[0219] The second disc bracket 23 is arranged to partially receive the multi-disc assembly of the second clutch E2, referred to as the second set of discs 20a, 20b. In this case, the second disc bracket 23 is cylindrical. The second disc bracket 23 includes a spline portion 230 that partially engages with the second set of discs 20a, 20b, having a specific spline profile. The profile of the spline portion 230 is defined by alternating peaks 231 and grooves 232. In particular, the peaks 231 of the spline portion 230 enable rotation of the plate 20a of the second set of discs 20a, 20b. Figure 1 and 9 In the middle, the spline portions 130 and 230 are radially positioned above the annular edge 17.

[0220] The second set of discs 20a, 20b includes a plate 20a rotatably connected to a second disc holder 23, and a friction disc 20b rotatably connected to an output disc holder 26. The friction disc 20b is axially inserted individually between two consecutive plates 20a.

[0221] The output disc bracket 26 of the second clutch E2 is rotatably connected by meshing with the friction disc 20b and by a spline connection with the second driven shaft A2. The output disc bracket 26 is generally L-shaped, with its inner diameter rigidly connected to the splined output hub at its end.

[0222] Advantageously, the disc bracket 13 of the first clutch E1 and the disc bracket 23 of the second clutch E2 are formed into a common torque input disc bracket. As a result, the spline portion 130 of the first disc bracket 13 includes a profile complementary to the spline portion 230 of the second disc bracket 23.

[0223] In this configuration, spline portions 130 and 230 are shared and complementary to reduce the radial space occupied by mechanism 1. The peaks 131 of spline portion 130 form the grooves 232 of spline portion 230 in a complementary manner. The grooves 132 of spline portion 130 form the peaks 231 of spline portion 230 in a complementary manner, such as... Figures 1 to 4 As shown in 9 to 10.

[0224] As a variant not shown, the second disc bracket 23 can be attached to the first disc bracket 13. The disc brackets of the first clutch E1 and the second clutch E2 can be attached to each other and rigidly connected by welding or interlocking splines to form a common torque input disc bracket.

[0225] Advantageously, the first and second disc brackets 23 form part of a sub-assembly of the assembly, which also includes the central hub 50. As a result, an annular edge 17 is formed by the flange 53 of the central hub 50, obtained by forging and machining, and receives the first and second disc brackets 13, 23. The disc brackets 13, 23 are attached to the annular edge 17, for example, by welding. Here, the annular edge 17 is circumferentially continuous. The annular edge 17 is integrally formed with the flange 53. As a variation not shown, the annular edge 17 may be radially positioned above the disc brackets 13, 23.

[0226] exist Figure 1 and 9 The free space formed between the annular edge 17 and the remainder of the flange 53 allows the end of the balance cover 70 to be received and held. As a variation not shown, the annular edge 17 can support the balance cover 70, particularly on the radially inner edge 73, to center the balance cover 70 on the annular edge 17. The flange 53 is rigidly connected to the input web 3 via a drive cover 80 for rotation therewith. The drive cover 80 is attached to the outer periphery of the flange 53 of the center hub 50. The function of the center hub 50 is to transmit torque within the wet dual clutch 1. For this purpose, the drive cover 80 is rigidly connected to the center hub 50 by press-fitting onto the flange 53 for rotation therewith.

[0227] As a variant not shown, the drive cover 80 can be welded to the flange of the center hub.

[0228] The drive cover 80 includes external teeth kinematically connected to the rotary motor M, the teeth being integrally formed with or attached to the drive cover. The external teeth have a helical profile whose shape is complementary to the shape of the pinion gear of the rotary motor M. Alternatively, the teeth may have a straight profile whose shape is complementary to the chain or belt used to connect the rotary motor M. As a variation not shown, the drive cover 80 may include a ring gear axially offset relative to the flange 53 of the central hub 50.

[0229] The drive cover 80 includes an inner cylindrical surface 81 for supporting a first actuating piston 14 of the first clutch E1, which partially forms a first annular cavity 51. An oil supply passage 54c enters the first annular cavity 51, which is partially formed by an axial extension directly originating from the flange 53 and partially by the drive cover 80. The drive cover 80 surrounds the outer periphery of the flange 53. In another possible configuration, the oil supply passage may be closed by the inner cylindrical surface of the drive cover.

[0230] The first set of discs 10a and 10b also includes an end disc 10 axially located at the front end AV of the set 10a and 10b. Here, the end disc 10 is a plate 10a rotatably connected to the first disc bracket 13 and having a thickness Ep. The thickness Ep of the end disc 10 is defined between its two lateral faces 101 and 102, oriented toward the front AV and rear AR of the clutch E1, respectively. The thickness Ep of the end disc 10 is greater than the thickness of the other discs 10a and 10b in the first set of discs.

[0231] Discs 20a and 20b include end discs 20 axially located at the front end AV of the second set of discs 20a and 20b. End disc 20 is a plate 20a rotatably connected to the second disc bracket 23 and also has a greater thickness than the other discs 20a and 20b. As a variation not shown, end discs 10 and 20 may be friction discs rotatably connected to the corresponding output disc brackets of clutches E1 and E2.

[0232] In a known manner, each end plate 10, 20 includes a central area with an axis X through which other elements of the clutch mechanism pass, such as shafts A1, A2 and torque input disc brackets 13, 23.

[0233] For each of the respective clutches E1, E2, E1, E2 in the engaged configuration, actuation of pistons 14, 24 causes plates 10a, 20a to move axially relative to the friction disc. Plates 10a, 10b and 20a, 20b are stopped by corresponding axial locking rings 15, 25.

[0234] Axial locking rings 15, 25 are typically open retaining rings, meaning they are open between the two ends 151, 151' or 251, 251' to partially fit into the bottom of recesses 135, 235. The second recess 235 of clutch E2 is axially offset relative to the first recess 135 of clutch E1. The ends 151, 151' and 251, 251' of the first and second axial locking rings 15, 25 respectively define openings of the rings between them. The outer periphery of the axial locking ring 15 defines an outer diameter D3 along the axis X.

[0235] Each axial locking ring 15, 25 is inserted into a groove 135, 235, which is formed in the splined portion 130, 230 of the disc bracket of the corresponding clutch E1, E2. For example... Figure 3 and 8 As shown, each end includes a hole 19 into which the end of an assembly tool, such as pliers, can be received. During assembly, the first axial locking ring 15 elastically expands or separates from the hole 19 in the ends 151, 151', and is then released to accommodate in a first groove in the first disc holder. Figures 1 to 7 In cases 9 and 10, the annular shape of the first axial locking ring 15 has a constant diameter D3 without any change.

[0236] Preferably, the spline portion 130 defines an outer diameter D1 along the axis X. A first groove 135 is formed from the outer diameter D1 toward the axis X. The groove 135 is formed by a slot 132 in the spline portion 130.

[0237] In other words, the first groove 135 opens radially outward. For example... Figures 1 to 8 As shown, the bottom of the first groove 135 is discontinuous circumferentially around the axis X, and it is capable of receiving the first axial locking ring 15. In this case, the spline portion 130 is an external spline, i.e., oriented outward along the axis X.

[0238] Advantageously, the spline portion 230 defines an inner diameter D2 along the axis X. A second groove 235 is formed from the inner diameter D2 toward the axis X. In other words, the second groove 235 opens radially inward, which prevents the second locking ring 25 from axially disengaging from the second groove under the centrifugal force of the clutch E2. As a variation not shown, the spline portion 230 may be internal, wherein the groove 235 opens radially inward.

[0239] In this case, the spline portion 230 is therefore located internally, i.e., oriented towards the interior of mechanism 1. Figures 1 to 5 In section 8, the second groove 135 is formed by the groove 232 of the spline portion 230 and is radially open inward. The bottom of the second groove 235 is discontinuous around the axis X in the circumferential direction and is capable of receiving the second axial locking ring 25.

[0240] Notably, end plate 10 includes, preferably, annular recesses 115, 115'. Figures 1 to 8 In one embodiment, the first axial locking ring 15 is partially received within the recess 115.

[0241] The "annular" recess 115 refers to a space that is continuously open about axis X, receiving, for example, an axial locking ring 15. The shape of the annular recess 115 exhibits rotational symmetry, for example, obtained through machining, and its outer periphery 116 defines an outer diameter D. The diameter D of the annular recess 115 is sized such that the first axial locking ring 15 can be inserted into it before being partially received in the first groove 135.

[0242] exist Figures 1 to 8 In one embodiment, the recess 115 radially enters the central region of the end plate 10.

[0243] Furthermore, recesses 115 and 115' extend axially into the ground from the remaining discs of the first group 10a and 10b in opposite directions toward the front AV portion of the clutch E1. Figures 1 to 7In the annular recess 115, the space is substantially constant and uniform. Its outer periphery 116 is circular and defines a space uniformly separated from the axis of rotation X, having a constant outer diameter D. As a variation not shown, the end plate 20 of the second group may include an annular recess in which the second axial locking ring is partially accommodated.

[0244] During assembly, the first axial locking ring 15 is partially inserted into the first groove 135 formed in the first disc bracket 13, specifically through the channel in the annular recess 115. This ensures axial stop of the first set of 10a, 10b. In particular... Figures 1 to 8 In the middle, the annular recess 115 is positioned facing the first groove 135 in the first tray bracket 13.

[0245] When the first axial locking ring 15 is assembled, a portion of the first axial locking ring 15 is accommodated within the recess 115, which is the radially outer portion of the first axial locking ring 15, such as... Figures 1 to 8 As shown. Consequently, the first groove 135 receives the interior of the first axial locking ring 15, and the annular recess 115 receives the remaining exterior of the first axial locking ring 15. The interior and exterior of the axial locking ring 15 are defined relative to the outer diameter D1.

[0246] However, after the axial locking ring 15 has been assembled, an empty space, referred to as "free space," exists in the annular recess 115. This free space in the annular recess 115 is radially defined between the outer diameter D3 of the axial locking ring 15 and the outer diameter D of the outer periphery 116 of the annular recess 115. For a radially outwardly open recess, the axial locking ring 15 tends to disengage from the free space in the recess 115 under the action of rotation of the mechanism 1.

[0247] With the necessary modifications, the problem applies to any radially inwardly open groove that receives, for example, an axial locking ring for a second clutch E2. The embodiments disclosed below resolve this problem.

[0248] exist Figures 1 to 7 In embodiments 9 and 10, the end plate 10 includes recesses 115, 115', within which a portion of the retaining member 60 is accommodated, here being the radially outer end of the retaining member.

[0249] In addition, the retaining member 60 is partially fitted into the recesses 115, 115':

[0250] -Or it may be accommodated after the first axial locking ring 15 has already been present in the recess 115 (see...) Figures 1 to 7 );

[0251] -or may be housed separately in recess 115' (see Figure 9 and10 ).

[0252] exist Figures 1 to 7 In one embodiment, after the first axial locking ring 15, the retaining member 60 is partially inserted into the annular recess 115. The retaining member 60 is partially located between the first axial locking ring 15 and the annular recess 115, thus filling the remaining free space in the annular recess 115 and retaining the first axial locking ring 15 by preventing it from leaving the annular recess 115.

[0253] The retaining member 60 is preferably made as a single piece and is rigid. It can expand elastically and is made of plastic, elastomer, or composite material. The retaining member 60 is, for example, a steel locking washer.

[0254] Preferably, the retaining member 60 includes an annular central portion 61 and an annular peripheral portion 62 located radially outward of the annular central portion 61. The retaining member 60 may be generally S-shaped, C-shaped, or L-shaped. The annular central portion 61 and the annular peripheral portion 62 are axially offset from each other. The annular central portion 61 and the annular peripheral portion 62 are circumferentially continuous about axis X. As a variation not shown, one or both of them may be discontinuous.

[0255] In the first embodiment, the annular peripheral portion 62 retains the first axial locking ring 15.

[0256] Advantageously, the retaining member 60 includes alternating openings 66 and connecting arms 63 located between the annular central portion 61 and the annular peripheral portion 62 in order to reduce the axial space occupied.

[0257] A connecting arm 63 is defined between two adjacent openings 66. The connecting arm 63 is formed, for example, by stamping and cutting, and it connects the annular central portion 61 to the annular peripheral portion 62. The number of connecting arms 63 is typically between 2 and 20, preferably between 4 and 12. Especially... Figure 3 In the middle, the retaining member 60 includes an even number of arms, here the six connecting arms 63 of the retaining member 60, which are evenly distributed at an angle around the axis X.

[0258] As a variation not shown, retaining member 60 may include an odd number of connecting arms.

[0259] Each connecting arm 63 also includes two fillets 64. Each fillet 64 is an arc that connects the extension of the arm 63 to either the annular central portion 61 or the annular peripheral portion 62, so as to form a given tilt angle β, β'. As a result, the connecting arm 63 extends in the radial direction at tilt angles β, β', which are strictly greater than 15 degrees.

[0260] exist Figures 1 to 4In the middle, the dimensions of each connecting arm 63 are set at an angle of approximately 90 degrees β, β' along the length of peak 131.

[0261] Advantageously, the connecting arm 63 passes through the first and second disc brackets 13, 23. Each opening 66 in the retaining member 60 receives the free end section of the spline portion 130, 230 of the first and / or second disc bracket, which is referred to as the free end lug.

[0262] The joint of the free end lugs of spline portions 130 and 230 includes a fillet radius. The fillet radius defines a slot 136 between the two lugs. A "slot" refers to an opening with a circular open profile, for example, made by removing material.

[0263] Preferably, the dimensions of the slot 136 are defined along the length of at least one peak 131 or 231 and at an angle between two adjacent peaks 232 or 131. To reduce the axial space occupied, the connecting arm 63 is inserted into the slot 136 formed in the first disc bracket 13 and the second disc bracket 23 between diameters D1 and D2.

[0264] Each slot 136 receives at least one connecting arm 63 of the retaining member 60. The slots 136 are formed in the free ends of the spline portions 130 and / or 230 and are circumferentially spaced around the axis X.

[0265] In the example shown, each slot 136 is formed along the peak 131 of the first disc bracket. Here, the slot 136 is spaced apart by four adjacent peaks 131 of the spline portion 130. The fillet 64 connecting the annular peripheral portion 62 can be positioned facing the corresponding slot 136. As a variation not shown, the size of the slot 136 can be determined along the peak 231 of the spline portion 230.

[0266] The connecting arm 63 bends from notches 64' formed in the annular central portion 61 and the annular peripheral portion 62, respectively. The paired notches 64' are positioned around the axis X. The connecting arm 63 is derived from the shape of the notches 64'. A "notch" refers to a longitudinal (referred to as radial) material removal portion made in the two portions 61, 62 by cutting and / or removing material during the manufacturing process of the retaining member 60.

[0267] Furthermore, the retaining member 60 includes an annular edge 67, which is specifically arranged to cover the first locking ring 15. Advantageously, the annular edge 67 can be received within the recess 115. Therefore, the dimension of the annular edge 67 is determined based on the remaining free space in the annular recess 115 after the first axial locking ring 15 has been assembled. The annular edge 67 is radially received between the end plate 10 and the first axial locking ring 15 to fill the remaining free space in the recess 115 and cover the axial locking ring 15.

[0268] Preferably, the annular peripheral portion 62 partially forms an annular edge 67 and is positioned radially outward of the first axial locking ring 15. In the example shown, the annular edge 67 may form the radially outer end of the retaining member 60. The retaining member 60 also includes a radially inner end 65, which may also form an annular edge.

[0269] In the first embodiment, the annular edge 67 is circumferentially continuous around axis X so as to fill the free space in the annular recess 115 over 360 degrees. The annular edge 67 is obtained, for example, by forging and machining the retaining member 60.

[0270] In the sixth embodiment, the annular edge 67 is circumferentially discontinuous, formed by a plurality of portions 670 angularly distributed (particularly uniformly distributed) around the axis X. In this case, each portion 670 of the annular edge 67 is defined between two adjacent connecting arms 63. Similarly, portions 670 of the annular edge 67 may at least partially cover the first locking ring 15.

[0271] In the first embodiment, the retaining member 60 extends radially between the first clutch E1 and the second clutch E2. Figures 1 to 4 In this configuration, the annular peripheral portion 62 is positioned radially aligned with the clutch E1. The annular central portion 61 is positioned aligned with the second clutch E2. The axial retention of the annular peripheral portion 62 is fixed to the outside of the first clutch E1 from the annular central portion 61.

[0272] The retaining member 60 is axially held by at least one component of the second clutch E2, here by a second axial locking ring 25. As a result, the annular central portion 61 of the retaining member 60 is axially stopped by the second axial locking ring 25 so as to accommodate the annular peripheral portion 62 in the annular recess 115. Preferably, the connecting arm 63 extends toward the second clutch E2 and is inclined in the axial direction at a given tilt angle β, β'.

[0273] Advantageously, the annular center portion 61 is inserted between the second axial locking ring 25 and the end plates 20 of the second set 20a, 20b. Figures 1 to 4 In the middle, the second axial locking ring 25 and the end plate 20 axially hold the annular center 61 of the retaining member 60 on both sides.

[0274] As a variation not shown, the end discs 20 of the second set of discs 20a and 20b may include an annular recess, in which the annular center portion 61 of the retaining member is accommodated, further limiting the space occupied.

[0275] If the first clutch E1 is radially located below the second clutch E2, this configuration can be applied to the annular periphery 62 with necessary modifications. In this case, which is not shown, the annular center portion 61 of the retaining member, positioned aligned with the first clutch E1, will retain the first axial locking ring 15, and the annular periphery 62 will be positioned aligned with the second clutch E2.

[0276] Now will describe as follows Figures 1 to 4 The method of assembling mechanism 1 shown in the first embodiment. Among other things, the assembly includes the following steps:

[0277] – Based on the first step, for the first clutch E1, the following is provided:

[0278] - A first tray 13, having a rotation axis X and including a first groove 135.

[0279] - The first set of disks 10a and 10b, with end disk 10 including an annular recess 115.

[0280] - First axial locking ring 15 and retaining member 60.

[0281] –According to the second step, the first set of trays 10a and 10b are stacked alternately, partially supported by the first tray bracket 13, and end with the end tray 10 supported by the first tray bracket 13.

[0282] –According to the third step, before the first axial locking ring 15 is partially received in the first groove 135 of the first disc bracket 13, the first axial locking ring 15 is inserted into the annular recess 115 in the end disc 10 of the first set 10a, 10b.

[0283] –According to the fourth step, a portion of the retaining member 60, such as the annular peripheral portion 62, is inserted into the remaining free space within the annular recess 115 in the end plate 10.

[0284] The first axial locking ring 15 can be easily removed by pulling the retaining member 60 out of the recess 115. The annular recess 115 and the first groove 135 preferably face each other, such that the first axial locking ring 15 is received together in the groove 135 and the annular recess 115.

[0285] –According to the additional fifth step, the following is provided for the second clutch E2:

[0286] - A second tray 23, having a rotation axis X and including a second groove 235.

[0287] -Including the second tray group 20a, 20b of the end tray 20.

[0288] –According to the additional sixth step, another part of the retaining member 60, such as the annular central portion 61, is positioned such that it is axially supported on the end plate 20 of the second set of discs 20a, 20b.

[0289] –According to the additional seventh step, the second axial locking ring 25 is positioned such that it is axially supported on the end plate 20 of the second set of discs 20a, 20b, and then the second axial locking ring 25 is partially received in the second groove 235 in the second disc bracket 23.

[0290] The second axial locking ring 25 is assembled only after the retaining member 60 has been assembled, that is, after the annular center 61 has been positioned such that it is axially supported on the end plates 20 of the second set 20a, 20b.

[0291] Therefore, during the assembly of clutches E1 and E2, retaining member 60 is fixedly assembled. The first axial locking ring 15 can be removed by successively pulling out the second axial locking ring 25 from the second groove 235 aligned with the second clutch E2, and then pulling out the retaining member 60 from the annular recess 115 aligned with the first clutch E1.

[0292] In another embodiment, not shown, the retaining member can be rigidly fastened to the end plate by welding, deformation with a press, or by any other fastening or interference-fitting device. This avoids any risk of the retaining member detaching from the recess in the end plate. In this case, the recess in the end plate can, for example, receive a welded portion formed, for example, between the annular periphery and the radial outer wall of the recess.

[0293] Figure 5 and 6 The second and third embodiments of the present invention are shown respectively, which are substantially similar to the first embodiment, except that the retaining member 60 of the first axial locking ring 15 is axially held by the locking members 10, 13 belonging to the first clutch E1.

[0294] In the second and third embodiments, the retaining member 60 is elastically deformed such that it is axially held relative to the components 10, 13 of the first clutch E1, here the end plate 10. The retaining member 60 is axially fixed to the end plate 10 of the first set 10a, 10b, which has a thickness of Ep.

[0295] In the second and third embodiments, the end plate 10 is the plate 10a that forms the locking component of the first clutch E1. The end plate 10 receives the two ends 151, 151' of the retaining member 60. The annular central portion 61 and the annular peripheral portion 62 of the retaining member 60 are positioned aligned with the end plate 10.

[0296] In the second embodiment, a portion of the retaining member 60 is axially supported on a lateral surface 101 oriented toward the front AV portion of the clutch E1. More specifically, the end plate 10 also includes an annular cavity 125 formed by its lateral surface 101, within which a portion of the retaining member 60 is received.

[0297] exist Figure 5 In this configuration, the annular cavity 125 is positioned to extend radially beyond the annular recess 115.

[0298] In the second embodiment, the annular peripheral portion 62 is received within the annular cavity 125 by press fitting, interlocking, or any other known assembly method. The annular central portion 64 is then secured in the annular recess 115 to retain the first axial locking ring 15. Preferably, the width of the annular cavity 125 is determined according to the width of the annular peripheral portion 62.

[0299] As a variation not shown, cavity 125 can be formed by a set of spaced cuts evenly distributed at an angle around axis X. As a result, the annular peripheral portion 62 can be discontinuous around axis X.

[0300] In this third embodiment, a portion of the retaining member 60 is axially supported on a lateral surface 102 of the end plate 10, the lateral support surface 102 being oriented toward the rear AR portion of the clutch E1 and opposite to the lateral surface 101. Preferably, the lateral support surface 102 is axially opposite to the annular recess 115.

[0301] More specifically, the annular central portion 61 is axially supported on the lateral support surface 102 to secure the retaining member 60. The annular peripheral portion 62 is then received within the annular recess 115 to retain the first axial locking ring 15. Figure 6 In this configuration, the retaining member 60 is supported on the lateral support surface 102 from the inner periphery of the end plate 10 (in other words, from the central area of ​​the end plate 10). The retaining member 60 may be a basic C-shape or an upward-curving U-shape.

[0302] In this third embodiment, the connecting arm 63 extends radially below the end plate 10 and passes through the first plate bracket 13 via the slot 136. The fillet 64 can deform during the assembly of the retaining member 60, thereby applying a clamping force on the annular center portion 61 to axially and securely retain the retaining member 60.

[0303] exist Figure 6 In this configuration, the end of the annular central portion 61 is located below the friction disc 10b immediately adjacent to the end disc 10. The annular central portion 61 is partially received in the axially defined space between the end disc 10 and the adjacent plate 10a of the first set of discs. As a variation not shown, the end of the annular central portion 61 may be supported on a plate 10a different from that of the end disc 10, such as the plate 10a of the first set of discs immediately adjacent to the end disc 10.

[0304] Figure 7 A fourth embodiment of the invention, substantially similar to the first embodiment, is shown, except that the retaining member 60 of the first axial locking ring 15 is axially held in relation to the components of the first clutch E1 referred to as the "adjacent portion". In this embodiment, the retaining member 60 elastically deforms such that it is axially held relative to the components 10, 13 of the first clutch E1, here the first disc bracket 13 of the first clutch E1. More specifically, here, the rigid retaining member 60 is held axially fixed by being supported on the spline portion 130 of the first disc bracket 13.

[0305] In this fourth embodiment, the spline portion 130 is rotatably connected to the end plate 10, which includes the annular recess 115, and thus forms the adjacent portion of the first clutch E1. Figure 7 In this configuration, the annular central portion 61 is axially supported on the free end of the spline portion 130, for example by press fit, interlocking, or any other known assembly method, to secure the retaining member 60. The annular peripheral portion 62 is then received within the annular recess 115 to retain the first axial locking ring 15. The retaining member 60 may be substantially inverted L-shaped.

[0306] Figure 8 A fifth embodiment of the invention, substantially similar to the first embodiment, is shown, except that the annular recess 115 in the end plate 10 includes an outer periphery 116 defined by a radially variable outer diameter D. As a result, the outer periphery 116 of the annular recess 115 extends radially according to a variation ΔD. Therefore, the shape of the annular recess 115 is not circular, but radially variable according to a variation ΔD, which differs from the other embodiments described above. Mechanism 1 does not include additional retaining members.

[0307] The variation ΔD of the outer diameter D is defined between the maximum outer diameter of the recess (referred to as the "maximum diameter Da") and the minimum outer diameter of the annular recess (referred to as the "minimum diameter Db" of the recess). Therefore, the outer diameter D extends radially between the maximum and minimum diameters Da and Db.

[0308] In this fifth embodiment, the annular recess 115 includes at least one region with a maximum outer diameter Da 116A and at least one region with a minimum outer diameter Db 116B. Regions 116A and 116B extend continuously in the circumferential direction.

[0309] exist Figure 8 In this case, the annular recess 115 thus includes a single region 116A and a single region 116B. As a variation not shown, the variation ΔD can extend continuously circumferentially around the axis X.

[0310] The advantage of this variation ΔD of the outer periphery 116 for the annular recess 115 is that, by receiving the first axial locking ring 15, at least partially forming the retention of the first axial locking ring 15 in the minimum outer diameter Db region 116A. This machining of the annular recess, defined by the variation ΔD of the outer diameter D, minimizes the free space in at least one region 116B of the annular recess.

[0311] In other words, the first axial locking ring 15 is supported on the minimum outer diameter Db of the annular recess 115. The outer periphery 116 is radially closer to the axis X so that the first locking ring can be clamped or secured in the minimum outer diameter Db region 116A by rotating on the annular recess. For example, the outer periphery of the axial locking ring 15 may be supported on the outer periphery 116 of region 116A of the recess 115. The minimum diameter Db is then equal to the outer diameter D3 of the axial locking ring 15.

[0312] Advantageously, the retaining devices 18 are formed by the outer periphery of the first axial locking ring 15, and they project radially outward from the first axial locking ring 15 so as to partially interact with the outer periphery 116 of the annular recess 115. The retaining devices 18 of the first axial locking ring 15 are held or clamped on the minimum outer diameter Db of the annular recess 115 by rotation on the annular recess, in region 116B of the annular recess 115.

[0313] The outer periphery 116 of the maximum diameter Da region 116A can receive the retaining device 18 of the first axial locking ring 15 by rotation (or angular pivot) of the first axial locking ring 15 during the assembly process, and then position them in the minimum diameter Db region 116B.

[0314] Preferably, the retaining device 18 is a locking lobe formed on both ends 151, 151' of the open first axial locking ring 15. These locking lobes 180 of the first axial locking ring 15 project radially toward the outer periphery 116 of the recess 115. Figure 8 As shown, the minimum diameter Db is equal to the outer diameter of the locking convex angle 180 of the first axial locking ring 15.

[0315] As a variation not shown, a retaining device may be formed between the two ends 151, 151' of the axial locking ring 15 to form, for example, a circumferential locking wave of the first axial locking ring 15.

[0316] Specifically, each locking protrusion 180 includes a hole 19 in which the end of an assembly tool, such as pliers, can be received. When the first axial locking ring 15 is fitted into the recess 115, the first axial locking ring 15 elastically expands or separates from the hole 19 in the ends 151, 151' and is then elastically released so that it is received in the first groove 135 in the first disc holder 13.

[0317] exist Figure 8 In this configuration, the shape of the minimum diameter region 116B is determined by the shape of the retaining device 18. Preferably, the shape of the minimum diameter region 116B is complementary to the shape of the retaining device 18 of the first axial locking ring 15, and more specifically, to the shape of the retaining convex angle 180. For example, at least one locking convex angle 180 interacts with the concave circular surface of the outer periphery 116 of region 116B.

[0318] Advantageously, the outer periphery 116 of the minimum diameter Db region 116B also includes at least one anti-rotation edge 117 to stop the first axial locking ring 15. The anti-rotation edge 117 can block the locking protrusions 180, 15 at a specific angular position predefined by the annular recess 115, so as to optimize and simplify the positioning of the first axial locking ring 15 during assembly.

[0319] Now it will be described as follows Figure 8 The fifth embodiment shows a method for assembling the clutch mechanism 1. Among other things, the assembly includes the following steps:

[0320] – Based on the first step, for the first clutch E1, the following is provided:

[0321] -Including the first tray 13 with the first groove 135

[0322] - The first set of disks 10a and 10b, wherein the end disk 10 includes an annular recess 115 defined by a radially variable outer diameter D, the annular recess 115 including a maximum diameter region Da region 116A and a minimum diameter region Db region 116B.

[0323] - First axial locking ring 15.

[0324] –According to the second step, the first set of trays 10a and 10b are inserted into the first tray holder 13 and rotatably connected to the end tray 10 of the first tray holder 13.

[0325] –According to the third step, the first axial locking ring 15 elastically expands and is then inserted into the annular recess 115 in the maximum diameter region 116A, for example by elastic separation defining the opening between the two ends 151, 151' of the first axial locking ring 15, so that it can then be elastically released and positioned in the first groove 135 in the first disc bracket 13.

[0326] –According to the fourth step, the first axial locking ring 15 is elastically released, so that it is received in the first groove 135 in the first disc holder 13. The annular recess 115 and the first groove 135 are positioned facing each other, such that the first axial locking ring 15 is received together in the groove 135 and the recess 115.

[0327] – In step five, the first axial locking ring 15 is pivoted to position it within the minimum diameter region 116B of the annular recess 115. The first axial locking ring 15 can be easily removed by withdrawing the retaining member 60 from the annular recess 115.

[0328] Figures 9 to 12 A sixth embodiment of the present invention is shown, which is substantially similar to the first embodiment, except that:

[0329] – Recess 115' only accommodates retaining member 60;

[0330] – The interior of recess 115' does not contain an axial locking ring;

[0331] – The first axial locking ring 15 and the end plate 10 are axially offset from each other. The recess 115 and groove in the end plate 10 are axially offset from each other. In particular, the first axial locking ring 15 is axially inserted between the retaining member 60 and the end plate 10.

[0332] – The first axial locking ring 15 is axially away from the end plate 10. As a result, in order to keep the retaining member 60 fixed relative to the end plate 10, the retaining member 60 may include a retaining lug 68, particularly arranged to be received within a recess 115', preferably fixedly received.

[0333] If the recess 115' is only capable of receiving a retaining member, then the recess 115' is made to have a smaller size. This reduces the amount of material removed from the end plate 10 of the first group.

[0334] In this sixth embodiment, the recess 115' in the end plate is circumferentially discontinuous, specifically formed by a series of spaced-apart cuts made by localized material removal. The cuts are angled around axis X, preferably regularly or uniformly distributed, and form the recess 115'. The cuts in the recess 115' comprise closed contours, here circular. Material removal from the end plate is further reduced. The cuts are positioned axially facing the retaining lug 68.

[0335] Preferably, the annular peripheral portion 62 partially forms these retaining lugs 68, and they are positioned radially outward of the first axial locking ring 15. Furthermore, these retaining lugs 68 may also form the radially outer ends of the retaining member. For example, the retaining lugs 68 (here, 48) are distributed at an angle around the axis X, particularly regularly or uniformly.

[0336] In this sixth configuration, each retaining lug 68 extends radially from the annular periphery 62 to form a specific insertion angle β", preferably equal to 90 degrees. In the illustrated example, the retaining lug 68 may extend parallel to the axis X, particularly toward the radially outer periphery of the recess 115'. Specifically, the retaining lug 68 extends toward the cutout in the recess, particularly along its radially outer profile, which is here curved or rounded. In particular, at least some of the retaining lugs 68 are arranged axially opposite to the arm 63, such as... Figure 11 As shown in detail below.

[0337] Alternatively or additionally, the annular central portion 61 may include a retaining lug (not shown) arranged to be received within a recess in the end disc of the second set. In this case, such a retaining lug may also form the radially inner end of the retaining member, aligned with the second clutch. Furthermore, the retaining member 60 includes alternating portions 670 of retaining lugs 68 and annular edge 67. The advantage is that they are evenly distributed around the first locking ring 15, which limits the lack of parallelism between the components.

[0338] Furthermore, the retaining lugs 68 are formed by cutting and bending the annular periphery 62. The retaining lugs 68 extend axially in particular and are formed by material deformation at their ends, thereby creating support regions 680. These support regions 680, preferably formed as bosses of the retaining lugs 68, are capable of interacting with the interior of the recess 115'. Preferably, the support regions 680 support the radially outer periphery 1150 of the recess 115', which improves the retention of the retaining member 60 relative to the end plate 10. These retaining lugs 68 can both cover the first axial locking ring 15 and be received within the recess 115', thus achieving a dual function.

[0339] A method for assembling the first clutch E1 will now be described with reference to the first and sixth embodiments, including at least the following steps:

[0340] – Based on step (a), the following is provided:

[0341] - A first tray 13, having a rotation axis X and including a first groove 135.

[0342] - The first set of disks 10a and 10b, the end disks 10 of which include recesses 115 and 115', said recesses being particularly capable of being continuous or discontinuous, for example annular;

[0343] - First axial locking ring 15 and retaining member 60.

[0344] –According to the second step (b), the first set of trays 10a and 10b are stacked alternately and partially supported by the first tray bracket 13, ending with the end tray 10 supported by the first tray bracket 13.

[0345] –For the first embodiment (see Figures 1 to 4 ):

[0346] –According to the third step (c), the first axial locking ring 15 is inserted into the annular recess 115 in the end plate of the first group, and then partially accommodated in the first groove 135 in the first plate bracket 13.

[0347] –Then, according to the fourth step (d), a portion of the retaining member 60 is inserted into the remaining free space within the annular recess 115 in the end plate 10 of the first group.

[0348] – Alternatively, for the sixth embodiment (see Figure 9 and 10 ):

[0349] –According to the third step (c'), the first axial locking ring 15 is partially inserted into the first groove 135 in the first disc bracket 13.

[0350] Then, according to the fourth step (d'), a portion of the retaining member 60 is inserted into the recess 115' in the end plate (10) of the first group, the recess 115' specifically receiving only the retaining member 60.

[0351] However, the invention is not limited to the devices and configurations described and illustrated herein, but extends to all equivalent devices or configurations and any technically operable combinations thereof.

[0352] The dual wet clutch mechanism 1 according to the invention can be associated, for example, with a K0 disengagement clutch, in which case the K0 disengagement clutch would be located upstream of the torque input element 2. The K0 disengagement clutch can then disconnect the internal combustion engine from the rest of the transmission line.

[0353] For example, the mechanism 1 according to the invention can form part of a triple clutch or a hybrid clutch, suitable for use in automatic, semi-automatic, hybrid, and / or electric transmissions of motor vehicles. The positions of the first and second clutches E1 and E2 can also be reversed.

[0354] In the claims, any reference symbols in parentheses should not be interpreted as limiting the claims.

Claims

1. A multi-plate clutch (E1) for a clutch mechanism (1), comprising: - Clutch disc bracket (13), - The first set of discs (10a, 10b), which are partially supported by the clutch disc bracket (13) and include the end disc (10), - A first axial locking ring (15), which is partially inserted into a first groove (135) formed in the clutch (E1) disc bracket (13), and - A retaining member (60) for retaining the first axial locking ring (15), the end plate (10) including recesses (115, 115'), a portion of the retaining member (60) being received in the recesses, the retaining member (60) being partially located between the first axial locking ring (15) and the annular recesses (115, 115') in the end plate (10).

2. The clutch (E1) according to claim 1, wherein, The first axial locking ring (15) is housed in a recess (115) in the end plate (10), the recess (115) being annular.

3. The clutch (E1) according to claim 1 or 2, wherein, The clutch (E1) disc bracket (13) includes a spline portion (130) arranged to rotate a portion of the first set of discs (10a), and the first groove (135) is formed in the outer diameter (D1) of the spline portion (130).

4. The clutch (E1) according to any one of claims 1 to 3, wherein, The retaining member (60) includes: - An annular edge (67) radially accommodated between the end plate (10) and the first axial locking ring (15), and / or - A retaining lug (68) is radially accommodated between the end plate (10) and the first axial locking ring (15). The annular edge (67) and / or retaining lug (68) are accommodated within the recess (115, 115').

5. The clutch (E1) according to claim 1, wherein, The retaining member (60) includes an annular central portion (61) and an annular peripheral portion (62) capable of retaining the first axial locking ring (15). The retaining member (60) includes a plurality of connecting arms (63) connecting the annular central portion (61) to the annular peripheral portion (62).

6. The clutch (E1) according to claim 1, wherein, The retaining member (60) is axially held by components (10, 13) of the clutch (E1), the components (10, 13) being selected from the clutch (E1) disc bracket (13) or the end discs (10) of the first set of discs (10a, 10b).

7. The clutch (E1) according to claim 6, wherein, The retaining member (60) is elastically deformed so that it is axially retained relative to the components (10, 13).

8. A clutch mechanism (1) comprising a first clutch (E1) for a clutch according to any one of claims 1 to 5, and a second multi-plate clutch (E2), the second multi-plate clutch (E2) comprising: - Clutch (E2) disc bracket (23), - The second set of discs (20a, 20b), which are partially supported by the clutch (E2) disc bracket (23) and include the end disc (20), - The second axial locking ring (25) of the end plate (20) is partially inserted into the second groove (235) formed in the clutch (E2) disc bracket (23), wherein the retaining member (60) of the first axial locking ring (15) is axially held by the second axial locking ring (25).

9. The clutch mechanism (1) according to claim 8, wherein, The retaining member (60) of the first axial locking ring (15) is inserted between the second axial locking ring (25) and the end plate (20) of the second set of discs.

10. The clutch mechanism (1) according to any one of claims 8 and 9, wherein, The retaining member (60) includes an annular central portion (61) and an annular peripheral portion (62) capable of retaining the first axial locking ring (15). The retaining member (60) includes a plurality of connecting arms (63) connecting the annular central portion (61) to the annular peripheral portion (62), wherein the annular peripheral portion (62) is aligned with the first clutch (E1) and the annular central portion (61) is aligned with the second multi-disc clutch (E2).

11. The clutch mechanism (1) according to claim 8, wherein, The clutch (E2) disc bracket (23) includes a spline portion (230) arranged to rotate a portion of the second set of discs (20a), and a second groove (235) formed in the spline portion (230) in the inner diameter (D2) of the spline portion (230).

12. The clutch mechanism (1) according to claim 11, wherein, The spline portion (130) of the first clutch (E1) has a profile that is complementary to the spline portion (230) of the second multi-plate clutch (E2).

13. The clutch mechanism (1) according to claim 8, wherein, The disc bracket (13) of the first clutch (E1) and the disc bracket (23) of the second multi-disc clutch (E2) are formed into a common torque input disc bracket.

14. The clutch mechanism (1) according to claim 8, wherein, The disc bracket (13) of the first clutch (E1) and the second multi-disc The disc bracket (23) of the clutch (E2) forms a common torque input disc bracket that is attached to each other.

15. The clutch mechanism (1) according to claim 14, wherein, The disc bracket (13) of the first clutch (E1) and the disc bracket (23) of the second multi-disc clutch (E2) are connected together by welding.

16. A method for assembling a first clutch (E1), comprising at least the following steps: a) Provide: - A first disc holder (13) including a first groove (135), - The first set of disks (10a, 10b) has an end disk (10) comprising an annular recess (115) defined by a radially variable (ΔD) outer diameter (D), the annular recess (115) comprising a maximum diameter (Da) region (116A) and a minimum diameter (Db) region (116B). - First axial locking ring (15), b) Insert the first set of trays (10a, 10b) into the first tray holder (13) and terminate with the end tray (10) rotatably connected to the first tray holder (13). c) The first axial locking ring (15) is elastically extended and then inserted into the annular recess (115) in the maximum diameter (Da) region (116A). d) The first axial locking ring (15) is elastically released such that it is received in the first groove (135) in the first disc bracket (13), and e) Pivot the first axial locking ring (15) to position it in the minimum diameter (Db) region (116B) of the annular recess (115).

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