FR3082572A1 - AXIAL STOPPING DEVICE BETWEEN TWO PARTS - Google Patents

Abstract

The invention relates to an axial stop device (1) between a first part (126) and a second part (130) surrounding the first part (126), the axial stop device (1) extending along an axis. main (O) and comprising at least one axial stop member (10) and a centering element (20) of the axial stop member (10), the axial stop member (10) being at least partly housed in the centering element (20). The invention also relates to a clutch module (70) comprising such an axial stop device (1). Application to motor vehicles.

Description

Axial stop device between two parts

The field of the present invention is that of clutch modules for motor vehicles. The invention relates to a particular axial stop device. The invention also relates to a clutch module comprising such an axial stop device.

In the state of the art, clutch modules are known comprising a clutch mechanism, movable in rotation about an axis of rotation, and an actuation system. The clutch mechanism of known clutch modules includes an input disc holder and at least one clutch. The input disc holder is coupled in rotation to a first shaft, called the drive shaft, in order to provide engine torque to at least one clutch. The at least one clutch is configured to be able to selectively couple or decoupled in rotation the motor shaft to a second shaft, called the transmission shaft. The actuation system controls the clutch mechanism. To this end, the actuation system is arranged to generate at least one force making it possible to configure the at least one clutch of the clutch mechanism in a engaged configuration or in a disengaged configuration. The force generated by the actuation system is transmitted to the at least clutch via a force transmission member which displaces the first friction elements of the at least one clutch relative to the second elements friction of the at least one clutch in order to configure said at least clutch in one or the other of the engaged or disengaged configurations.

In known manner, a clutch module comprises a first part, formed for example by a bearing surface of the actuation system or of the transmission shaft, extending along the axis of rotation of the clutch mechanism, on which are mounted the various components of the clutch module during the assembly of said clutch module. A known clutch module thus comprises an axial stop member, making it possible to axially stop a second part of the clutch module with respect to the first part, for example during assembly of the module. 'clutch. In addition, the axial stop member also makes it possible to ensure the axial stop of the second part with respect to the first part, for example when the actuation system generates an axial force in order to configure the at least one clutch in a engaged or disengaged configuration, the axial stop member thus allowing the second part to remain axially fixed relative to the actuation system despite the axial force generated by the actuation system, the second part being by example a support web configured to support the radial forces of the clutch module.

In order to facilitate the assembly of the components of a known clutch module, the first part includes a first end which has a smaller outside diameter than the outside diameter of the rest of the first part. In other words, the first end has a general cone shape. This configuration makes it easier to assemble the various components of the clutch module, such as the support web or the axial stop member, on the first part.

These known clutch modules are not entirely satisfactory and have drawbacks. In fact, during assembly of the clutch module, the axial stop member may not be centered radially with respect to the first part on which it must be mounted in order to ensure the axial stop of the mechanism. clutch with respect to the actuation system. In addition, given the space constraints within the clutch module, it is not generally not possible to sufficiently lengthen the cone of the first end of the first part, in order to reduce the outside diameter of the first end, with the aim that the outside diameter of the first end can be narrow enough to always be radially aligned with the inside diameter of the axial stop member. This therefore requires ensuring, during the assembly of a known clutch module, that the axial stop member is correctly centered radially with respect to the first part of the clutch module, so that the first the end of the first part can be accommodated in the internal diameter of the axial stop member.

The object of the present invention is to propose a new particular clutch module making it possible to respond at least in part to the drawbacks set out above and also to lead to other advantages.

Another object of the invention is to facilitate the assembly of such a clutch module on a transmission chain of a motor vehicle, and therefore to reduce the manufacturing costs of such a motor vehicle.

The invention achieves this, according to a first aspect, thanks to an axial stop device between a first tubular piece and a second tubular piece which surrounds the first tubular piece, the axial stop device extending along a main axis and comprising at least one axial stop member and a member for centering the axial stop member, characterized in that the axial stop member is housed at least partly in the centering member.

This configuration according to the first aspect of the invention thus makes it possible to ensure centering, by the centering element, of the axial stop member with respect to the first tubular part. In addition, the axial stop member ensures the axial stop of the second part with respect to the first tubular part.

In the following description and in the claims, the terms “internal / internal” or “external / external” with respect to the main axis of the device will be used without limitation and in order to facilitate understanding thereof. axial stop and in a radial orientation, orthogonal to said axial orientation, "inside" designating a proximal part of the main axis and "outside" designating a distal part of the main axis.

It is understood that such an axial stop device in accordance with the first aspect of the invention is not limited to the field of clutch modules for a motor vehicle, and can thus be integrated into any mechanical system comprising a member for axial stop ensuring an axial stop between a first part and a second part.

The axial stop device according to the first aspect of the invention advantageously comprises at least one of the improvements below, the technical characteristics forming these improvements can be taken alone or in combination:

- At least a portion of the inner diameter of the centering element is in contact with at least a portion of the outer diameter of the axial stop member;

- the centering of the axial stop member by the centering element is done in a radial direction relative to the main axis of the axial stop device;

- The first tubular part and the second tubular part are coaxial. Advantageously, the first part and the second part are coaxial along an axis of rotation of the second part, the axis of rotation then being the main axis of the axial stop device;

- the axial stop device is configured to be integrated into a component of a motor vehicle. More particularly, the motor vehicle can be a car or a heavy vehicle. Thus, the axial stop device can be configured to be integrated, for example, in a turbocharger system, for example an electric turbocharger. The axial stop device can also be integrated at a wheel axle;

- The axial stop device is configured to be integrated into a clutch module of a motor vehicle;

- the centering element includes circumferential waves. Circumferential waves are variations of the inside diameter of the centering element. More particularly, a circumferential wave corresponds to a reduction in the internal diameter of the centering element. The circumferential waves allow the centering element to ensure the radial centering of the axial stop member relative to the first part, while generating a low radial stiffness of the centering element, the radial stiffness of the centering element opposing the mounting force of the axial stop member. In addition, the circumferential waves make it possible to recover the radial distance which separates the axial stop device from the second part;

- the centering element is housed in a circumferential groove made in the second tubular part. Advantageously, the groove is formed on an inner radial face of the second part, said groove having a diameter at least equal to the outer diameter of the centering element. More particularly, the outer diameter of the centering element is in radial abutment against the inner radial face of the groove of the second part.

This configuration ensures the axial stop of the centering element by the second tubular part;

advantageously, the radial distance between the main axis of the axial stop device and a first circumferential wave of the centering element is identical to the radial distance between the main axis of the axial stop device and a second circumferential wave of the centering element, the radial distance being measured between the main axis of the axial stop device and the point where the circumferential wave defines an inner diameter of the smallest centering element. This configuration allows each circumferential wave of the centering element to bear radially against the axial stop member, the centering element thus ensuring the radial centering of the axial stop member; This configuration also makes it possible to guarantee the centering of the axial stop member with respect to the main axis of the axial stop device.

- the centering element comprises at least three circumferential waves, for example between three and ten circumferential waves. Each circumferential wave allows the formation of a contact point between the centering element and the axial stop member;

- the circumferential waves of the centering element are angularly regularly spaced. Advantageously, when the centering element comprises three circumferential waves, each circumferential wave is angularly distant by an angle between ioo ° and 140 °, or even between no ° and 130 °, in particular by an angle of 120 °, by relative to the adjacent circumferential wave. In a variant, the circumferential waves are angularly irregularly spaced;

- The centering element extends circumferentially around the main axis of the axial stop device according to an angular sector strictly less than 360 °, in particular less than or equal to 270 °, for example included in 200 ⁰ and 250 °. This configuration makes it possible to maintain the axial stop member housed at least partially in the centering element, while allowing a certain circumferential flexibility in the centering element. In addition, this configuration makes it possible to reduce the outside diameter of the centering element, in particular for accommodating it in the groove of the second part;

- the axial stop member comprises an elastic ring;

-the axial stop member is configured to be inserted into a groove formed circumferentially in the first part. Advantageously, the groove is formed on an inner radial face of the first part;

- a width of the centering element is greater than a thickness of the axial stop member. The width of the centering element and the thickness of the axial stop member are both measured along the main axis of the axial stop device;

- the axial stop member and the centering element are coaxial. Advantageously, the axial stop member and the centering element are coaxial along the main axis of the axial stop device;

- the axial stop member and / or the centering element comprises steel, plastic or any other elastically deformable material;

-the centering element is made of plastic, elastomeric material or composite material.

According to an example of the invention, the first tubular part is an axial extension range of an actuation system of a clutch module and the second tubular part is a support for the clutch module.

According to a second aspect, the invention also relates to a clutch module comprising an axial stop device as described in this document, where the first part is a component of the clutch module, while the second part is a component of the clutch module. The axial stop device according to the first aspect of the invention is thus configured to allow the radial centering of the component of the clutch module.

This configuration according to the second aspect of the invention makes it easier to assemble, in original equipment, for example by an automobile manufacturer, or in the after-sales network, for example by a motor vehicle dealer or by a company carrying out the maintenance of a motor vehicle. The assembly of such a clutch module is facilitated in particular by the radial centering of the axial stop member relative to the first part by means of the axial stop device.

In the following description, the terms "front" or "rear" depending on the direction relative to an axial orientation determined by the main axis of rotation of the mechanism will be used without limitation and in order to facilitate understanding. clutch, "the rear" designating the part of the clutch module on the side of a transmission, and "the front" designating the part of the clutch module on the side of an engine.

The clutch module according to the second aspect of the invention advantageously comprises at least one of the improvements below, the technical characteristics forming these improvements can be taken alone or in combination:

- The first part is an axial extension of an actuation system and the second part is a clutch support;

- the clutch module can be sold as original equipment, that is to say intended for motor vehicle manufacturers to equip the vehicle during its construction. The clutch module can also be sold in the after-sales network, as a spare part, in particular from dealers or auto parts sales companies;

- the clutch module includes a single clutch;

- the clutch module includes two clutches. The two clutches are arranged relative to each other in an axial configuration, one being located in front of the other. Alternatively, the two clutches can be arranged relative to each other in a radial configuration, one being located radially on the outside relative to the other;

-the clutch module contains three clutches. The three clutches can be arranged relative to each other in an axial configuration, or in a radial configuration or finally in a combination of the axial and radial configurations;

- Advantageously, the clutch module is of the wet type, thus allowing the cooling and lubrication of its components. Alternatively, the clutch module is of the dry type.

Other characteristics, details and advantages of the invention will emerge more clearly on reading the description which follows on the one hand, and several examples of embodiment given by way of non-limiting indication with reference to the schematic drawings annexed to the other share, on which:

- Figure i is a perspective view of an exemplary embodiment of an axial stop device according to the first aspect of the invention;

- Figure 2 is a front view of the axial stop device illustrated in Figure i;

- Figure 3 is a front view of an exemplary embodiment of a centering element of an axial stop device according to the first aspect of the invention;

- Figure 4 is a partial axial sectional view of an exemplary embodiment of a clutch module according to the second aspect of the invention;

- Figure 5 is a perspective view of an axial section of the clutch module illustrated in Figure 4, Figure 5 being focused on the axial stop device;

- Figure 6 is a front view from the front of the clutch module illustrated in Figure 4.

The characteristics, variants and different embodiments of the invention can be combined with one another, in various combinations, insofar as they are not incompatible or mutually exclusive of each other. One can in particular imagine variants of the invention comprising only a selection of characteristics described below in isolation from the other characteristics described, if this selection of characteristics is sufficient to confer a technical advantage or to differentiate the invention from in the prior art.

In particular, all the variants and all the embodiments described can be combined with one another if nothing is technically opposed to this combination.

Figure i illustrates a perspective view of an exemplary embodiment of an axial stop device i according to the first aspect of the invention. The axial stop device i comprises an axial stop member 10 and a centering element 20. The axial stop member 10 and the centering element 20 extend along a main axis O of the stop device axial 1. More particularly, the axial stop member 10 and the centering element 20 extend circumferentially around the main axis O in a generally circular shape. The axial stop member 10 is housed partly in the centering element 20. In other words, the axial stop member 10 is located, partially, radially inside with respect to the centering element 20.

The centering element 20 comprises three circumferential waves 21. Each circumferential wave 21 corresponds to a reduction in the internal diameter of the centering element 20, so that the centering element 20 is radially in contact with the member. axial stop 10 at each circumferential wave 21. More particularly, an external radial face of the axial stop member 10 is in contact with the internal diameter of the centering element 20. Thus, each circumferential wave 21 allows the formation of a contact zone 15 between the centering element 20 and the axial stop member 10. The circumferential waves 21 of the centering element 20 allow the centering element 20 to ensure the radial centering of the axial stop member 10.

The three circumferential waves 21 of the centering element 20 are angularly regularly spaced from one another. In other words, each circumferential wave 21 is spaced 120 ° from the adjacent circumferential wave 21, the angular distance between two circumferential waves 21 being measured at the level where the inside diameter of the centering element 20 is the smallest, that is to say between two contact zones 15 between the centering element 20 and the axial stop member 10.

The axial stop member 10 comprises a thickness e along the main axis O. Similarly, the centering element 20 comprises a width l along the main axis O. The thickness e of the member axial stop 10 is less than the width l of the centering element 20.

FIG. 2 illustrates a front view of the exemplary embodiment of an axial stop device 1 in accordance with the first aspect of the invention presented in FIG. 1.

The axial stop member 10 extends circumferentially around the main axis O along an angular sector of about 350 °. Thus the axial stop member 10 comprises a first end 11 and a second end 12 located circumferentially opposite the axial stop member 10 with respect to the first end 11, the first end 11 and the second end 12 being separated from each other by a first angular distance oc of approximately io °, making it possible, if necessary, to reduce the outside diameter of the axial stop member 10 by bringing the first end 11 closer to the second end 12, or else to increase the outside diameter of the axial stop member 10 by moving the first end 11 away from the second end 12.

The axial stop member 10 also includes a middle portion 14, located radially opposite the axial stop member 10 with respect to the first end 11 and the second end 12.

The axial stop member 10 comprises a first lateral part 31 situated circumferentially between the first end 11 and the middle part 14. Similarly, the axial stop member 10 comprises a second lateral part 32 located between the middle part 14 and the second end 12. The axial stop member 10 comprises a larger internal diameter at the first lateral part 31 and the second lateral part 32, to be compared with the internal diameter of the axial stop member 10 at the first end 11, the second end 12 or the middle part 14. Thus the smaller internal diameter at the first end 11, the second end 12 and the middle part 14 allows the axial stop member 10 to be housed partly in a circumferential groove of a first part, in order to achieve the axial stop of a second part by comparison ort to the first room.

The first end 11 of the axial stop member 10 comprises a first orifice 13 extending parallel to the main axis O through the first end 11 of the axial stop member 10. Similarly, the second end 12 of the axial stop member 10 comprises a second orifice 16 extends parallel to the main axis O through the second end 12 of the axial stop member 10. The first orifice 13 and the second orifice 16 are configured to allow, using a tool inserted into the first orifice 13 and the second orifice 16, the modification of the external diameter of the axial stop member

10.

FIG. 3 represents the centering element 20 of the axial stop device illustrated in FIGS. 1 and 2.

The centering element 20 comprises an outside diameter 23 and an inside diameter 22, the inside diameter 22 being defined by vertices 15a of circumferential waves 21. The vertices 15a of the centering element 20 have the smallest radial distance by relative to the main axis O. Thus, the vertices 15a form the contact zones 15 with the axial stop member 10 in an axial stop device 1.

Each circumferential wave 21 extends along an angular sector δ of approximately 50 °, the circumferential wave 21 being the portion of the centering element 20 which extends radially from the outside diameter 23 and towards the inside diameter 22 of l centering element 20.

The centering element 20 extends circumferentially around the main axis O along an angular sector β. In other words, the centering element 20 comprises a first termination 24 and a second termination 25 situated circumferentially opposite the centering element 20 relative to the first termination 24, the first termination 24 and the second termination 25 being separated by a second angular distance ε. The sum of the angles β and ε is equal to 360 °. In the example illustrated, the angle β is equal to 270 ° and the angle ε is equal to 90 °. This configuration allows the centering element to ensure the radial stop of the axial stop member 10, while having a certain circumferential flexibility allowing to ensure the radial centering of the axial stop member

10.

Figure 4 shows an axial sectional view of an exemplary embodiment of a clutch module according to the second aspect of the invention.

The clutch module 70 extends along a main axis O. The clutch module 70 comprises an input disc holder 62, a first clutch 90, a second clutch 100 located radially inside with respect to the first clutch 90. The clutch module 70 also includes an actuation system 120. The input disc holder 62 is coupled in rotation to a motor shaft 60 by means of an input web 61 extending radially outwards from the drive shaft 60 to the input disc holder 62. The input disc holder 62 is coupled in rotation to the input web 61.

The input disc holder 62 comprises a first bearing surface 96 for axial elongation and a second bearing table 97 for axial elongation situated inside the first bearing table 96 for axial extension of the input disc holder 62.

First friction elements 93 of the first clutch 90 extend radially inwards from the first bearing surface 96 of axial extension of the input disc carrier 62. The first friction elements 93 of the first clutch 90 are coupled in rotation with the first bearing surface 96 of axial extension of the input disc holder 62 in order to transmit a torque from the drive shaft 60. Second friction elements 94 of the first clutch 90 are located axially between the first friction elements 93 of the first clutch 90. The second friction elements 94 of the first clutch 90 are coupled in rotation to a first transmission shaft 92 by means of a first outlet web 91, said first outlet web 91 extending radially from the second friction elements 94 from the first clutch 90 to the first transmission shaft 92.

Similarly, first friction elements 103 of the second clutch 100 extend radially inward from the second bearing surface 97 of the input disc carrier 62. The first friction elements 103 of the second clutch 100 are coupled in rotation with the second bearing surface 97 of axial extension of the input disc carrier 62 in order to transmit a torque from the drive shaft 60. Second friction elements 104 of the second clutch 100 are located axially between the first friction elements 103 of the second clutch 100. The second friction elements 104 of the second clutch 100 are coupled in rotation to a second transmission shaft 102 by means of a second outlet web 101, said second outlet web 101 extending radially from the second friction elements 104 from the second clutch 100 to the second transmission shaft 102.

The input disc holder 62 comprises a third axial elongation surface 98 located inside with respect to the second axial elongation surface 97. The third axial elongation surface 98 is in radial support against a radial face outside of a bearing 131, said bearing 131 allowing the clutch mechanism to be movable in rotation relative to the actuation system 120. This configuration also allows the input disc carrier 62 to withstand the radial forces of the module clutch 70.

The actuation system 120 comprises a first force transmission member 121 and a second force transmission member 122. The actuation system 120 also comprises a first actuator 123 and a second actuator 124, configured to exert an axial force on the first force transmission member 121 or the second force transmission member 122, respectively. The first force transmission member 121 and the second force transmission member 122 make it possible to configure the first clutch 90 or the second clutch 100, respectively, in a clutched or disengaged configuration. Thus, the first force transmission member 121 and the second force transmission member 122 are in axial abutment against the first friction elements 93 of the first clutch 90 or the first friction elements 103 of the second clutch 100, respectively. This configuration thus allows the coupling in rotation of the first friction elements 93 and the second friction elements 94 of the first clutch 90 when the first actuator 123 exerts an axial force on the first force transmission member 121. Similarly, this configuration allows the first friction elements 103 and the second friction elements 104 of the second clutch 100 to be coupled in rotation when the second actuator 124 exerts an axial force on the second force transmission member 122.

The actuation system 120 comprises a housing 125 in which are housed the first actuator 123 and the second actuator 124. The housing 125 of the actuation system 120 comprises an axial elongation span 126 extending in the direction of the web of entry 61.

The clutch module 70 comprises a clutch support 130 which is axially rearwardly supported AR against an axial front face of the bearing 131.

The clutch module 70 includes an axial stop device 1 according to the first aspect of the invention. Thus, the axial stop device 1 comprises an axial stop member 10 ensuring the axial stop of the housing 125 of the actuation system 120, the housing 125 forming the first part, relative to the clutch support 130, forming the second room. The centering element 20 is located radially outside the axial stop member 10, thus allowing the axial stop device 1 to ensure the radial centering of the axial stop member 10 relative to the axial extension range 126 of the housing 125 of the actuation system 120.

A first opening 63 extends through the entry veil 61 along the main axis O. A second opening 64 extends through the first exit veil 91 along the main axis O. Finally a third opening 65 s 'extends through the second outlet sail 101 along the main axis O.

Figure 5 shows a partial axial sectional view of an exemplary embodiment of a clutch module 70 according to the second aspect of the invention, Figure 5 being focused on the axial stop device.

The axial elongation range 126 of the housing 125 of the actuation system 120 comprises a groove 127 formed on an external radial face 128 of the axial elongation range 126. The groove 127 thus makes it possible to accommodate an internal radial face of the axial stop member 10. The axial stop member 10 extends radially from the groove 127 towards the outside, so that the axial stop member 10 extends radially outside the groove 127, thus allowing the axial stop member 10 to exercise the axial stop of the clutch support relative to the axial elongation range 126 of the housing 125 of the actuation system 120.

The axial elongation range 126 of the housing 125 of the actuation system 120 extends axially from the housing 125 of the actuation system 120 to one end 128. The end 128 of the axial elongation range 126 of the housing 125 of the actuation system 125 comprises a general cone-shaped shape. More particularly, the axial elongation range 126 of the housing 125 of the actuation system 120 comprises a smaller external radial diameter at the end 128. This configuration makes it possible to facilitate the axial insertion of the stop member axial 10 in the groove 127 of the axial elongation span 126 of the housing 125 of the actuation system 120.

FIG. 6 represents a front view, from the front AV, along the main axis O, of the clutch module 70 illustrated in FIG. 4.

The clutch module 70 comprises three windows 66, angularly regularly spaced from one another, the three windows 66 being arranged circumferentially with respect to the main axis O. This configuration makes it possible to easily visualize whether the stop member axial 10 is correctly centered, by the centering element 20,

Of course, the invention is not limited to the examples which have just been described and numerous modifications can be made to these examples without departing from the scope of the invention. In particular, the different characteristics, forms, variants and embodiments of the invention can be associated with each other in various combinations insofar as they are not incompatible or mutually exclusive of each other. In particular, all the variants and embodiments described above can be combined with one another.

Claims (11)

1. Axial stop device (i) between a first tubular part (126) and a second tubular part (130) which surrounds the first tubular part (126), the axial stop device (1) extending in a main axis (O) and comprising at least one axial stop member (10) and a centering element (20) of the axial stop member (10), characterized in that the axial stop member ( 10) is housed at least partly in the centering element (20). 2. Axial stop device (1) according to the preceding claim, configured to be integrated into a component of a motor vehicle. 3. Axial stop device (1) according to one of the preceding claims, configured to be integrated in a clutch module (70) of a motor vehicle. 4. Axial stop device (1) according to one of the preceding claims, in which the centering element (20) comprises circumferential waves (21). 5. Axial stop device (1) according to claim 4, wherein the centering element (20) comprises at least three circumferential waves (21). 6. Axial stop device (1) according to one of claims 4 or 5, wherein the circumferential waves (21) of the centering element (20) are angularly regularly spaced. 7. Axial stop device (1) according to one of the preceding claims, in which the centering element (20) extends circumferentially around the main axis (O) along a strictly lower angular sector (β) 360 °, especially less than or equal to 270 °, for example between 200 ° and 250 °. 8. Axial stop device (1) according to one of the preceding claims, in which a width (Z) of the centering element (20) is greater than a thickness (e) of the axial stop (10). 9- Axial stop device (i) according to one of the preceding claims wherein the centering element (20) is made of plastic, elastomeric material or composite material. 10. Clutch module (70) for a motor vehicle, said module 5 clutch (70) comprising an axial stop device (1) according to one of claims 1 to 9. 11. Clutch module (70) according to the preceding claim wherein the first tubular part (126) is an axial elongation of an actuating system (120) and the second tubular part (130) is a 10 clutch support.