FR3025265A1 - CLUTCH-CLUTCH OR SUSPENSION FASTENING, SYSTEM EQUIPPED WITH SUCH A ROCKET AND METHOD OF MANUFACTURING SUCH A FASTENING - Google Patents

Abstract

The present invention relates to an abutment (10) for clutch-disengagement or suspension of a motor vehicle, this abutment (10) comprising: a bearing (20) including a non-rotating ring (21) and a rotating ring (22) centered on a central axis, as well as rolling elements (23) positioned in a rolling chamber (28) defined between the rings (21, 22), the rotating ring (22) including a radial outer collar (70); and a sealing device (40) mounted on the non-rotating ring (21) to protect the rolling chamber (28) and the rolling elements (23) from infiltrations of liquid or polluting particles. The stop (10) is characterized in that the sealing device (40) comprises both: a first lip (47) disposed in contact with the rotating ring (22), and a second lip (48) which extends in the direction of the radial outer collar (70), without contact with this radial outer collar (70) when the stop (10) is in a rest configuration. The invention also relates to an automobile system equipped with such a stop (10) and a method of manufacturing such a stop (10).

Description

The present invention relates to a clutch-clutch or suspension stopper used in a motor vehicle, for transmitting a clutch-clutch release or suspension used in a motor vehicle, for transmitting a clutch-clutch release or suspension used in a motor vehicle, for transmitting a clutch-clutch release or suspension used in a motor vehicle, for transmitting a clutch axial force between a non-rotating part, such as an actuating piston, and a rotating part, such as a gear box diaphragm. The invention also relates to an automotive system equipped with such a stop and a method of manufacturing such a stop. In the automotive field, it is known to use a clutch-clutch release to actuate the rotating diaphragm of a gearbox. To do this, the stop comprises a bearing including a rotating ring intended to be in contact with the beaks of the diaphragm and a non-rotating ring intended to be in contact with an operating member, for example a piston. US Pat. No. 8,348,512 describes an example of such a stop, comprising a ball bearing and two sealing devices. The bearing comprises a non-rotating outer ring and a rotating inner ring, between which is defined a bearing chamber for the balls. The sealing devices are fixed to the outer ring and positioned on either side of the rolling chamber. The inner ring has an axial bearing and a radial outer collar. The sealing device located on the side of this flange comprises a first lip positioned in contact with the axial bearing, and a second lip which extends in the direction of the axial bearing, without contact between them. However, the impurities can penetrate between this sealing device and the flange, then accumulate at the lips. The object of the present invention is to provide an improved stop.

For this purpose, the subject of the invention is a clutch-disengagement stop or suspension of a motor vehicle, this stop comprising: a bearing including a non-rotating ring and a rotating ring centered on a central axis, as well as rolling elements positioned in a rolling chamber defined between the rings, the rotating ring including a radial outer flange; and a sealing device mounted on the non-rotating ring, for protecting the rolling chamber and the rolling elements from infiltration of liquid or polluting particles. This stop is characterized in that the sealing device comprises both: a first lip arranged in contact with the rotating ring, and a second lip which extends in the direction of the radial outer collar, without contact with this outer collar radial when the stop is in a rest configuration.

Thus, the invention improves the sealing of the stop on its front side where the diaphragm is positioned against the flange. The second lip forms a labyrinth with the inner ring, so as to stop the impurities before they penetrate between the flange, the axial scope and the first lip. The second lip is not positioned in contact with the flange, thus avoiding an increase in the friction torque and a deformation of this second lip in use. Both lips effectively protect the bearing, while maintaining the lubricant in the bearing chamber. According to other advantageous features of the invention, taken separately or in combination: The radial outer flange has a convex surface on a front side and a concave surface on a rear side which is directed towards the rolling chamber. - The rotating ring has an axial bearing against which the first lip is disposed in contact. 15 - A contact between the second lip and the radial outer collar is possible when the stop is in use. - The second lip is disposed in a central portion of the sealing device, between the first lip and the non-rotating ring. The second lip is more elongated than the first lip in a direction parallel to the central axis. In a cutting plane including the central axis, the second lip extends parallel to the central axis. In a cutting plane including the central axis, the second lip is inclined with respect to the central axis. The second lip extends back from the radial outer flange, an axial gap being provided between the second lip and the radial outer flange in the rest configuration. The second lip extends beyond the radial outer flange, a radial gap being provided between the second lip and the radial outer flange in the rest configuration. The invention also relates to a clutch-disengaging or suspension system of a motor vehicle, equipped with a stop as mentioned above. The invention also relates to a method of manufacturing a stop as mentioned above. This method is characterized in that it comprises at least the following steps: a) manufacturing the non-rotating ring, the rotating ring and the rolling elements of the bearing; b) manufacturing the sealing device, including the first lip and the second lip; c) mounting the sealing device on the non-rotating ring of the bearing, with the first lip which is disposed in contact with the rotating ring and the second lip which extends in the direction of the radial outer collar, without contact with this radial outer collar. The invention will be better understood on reading the description which follows, given solely by way of nonlimiting example and with reference to the appended drawings in which: FIG. 1 is a partial section of a clutch system -brake according to the invention, comprising a stop also in accordance with the invention; Figure 2 is an enlarged view of detail II in Figure 1; Figures 3, 4 and 5 are views similar to Figure 2, showing a second, a third and a fourth embodiment of the invention. Figures 1 and 2 is partially shown a clutch-clutch system 1 according to the invention. The system 1 is intended to equip a motor vehicle and comprises a clutch release clutch 10 also in accordance with the invention. The abutment 10 has a central axis X1. Thereafter, define an axial direction which extends parallel to the axis X1 and a radial direction which extends radially to the axis X1. Also, a front side C1 and a rear side C2 of the abutment 10 are defined. As shown partially and schematically in FIG. 1, the system 1 comprises a guide sleeve 2, a rear plate 3, a protective cap 4, a metallic wire 5, a corrugated spring 6, a diaphragm 7 and the stop 10. The sleeve 2 is made of synthetic material and forms an inner shaft. The sleeve 2, the plate 3 and the cover 4 can be assembled by overmolding. The spring 6 and the abutment 10 are positioned in a space delimited by the sleeve 2 and the cover 4. The cover 4 and the spring 6 form means of self-alignment of the constituent elements of the abutment 10. The diaphragm 7 30 is partially represented by one of its beaks, positioned in abutment against the abutment 10 of the front side C1. The abutment 10 comprises a bearing 20 and two sealing devices 30 and 40, positioned on either side of the bearing 20, respectively on the rear side C2 and on the front side C1 of the abutment 10.

The bearing 20 comprises a non-rotating outer ring 21 and a rotating inner ring 22, between which is defined a bearing chamber 28. The bearing 20 also comprises rolling elements 23, in this case balls, positioned in the Bearing chamber 28. Each of the rings 21 and 22 is formed by stamping a metal sheet or by any other means suitable for the present application. The central axis X1 forms the relative axis of rotation of the rings 21 and 22 relative to each other. The ring 22 has an axial bearing 50, a curved portion 60 and a radial outer flange 70. The axial bearing 50 is cylindrical and centered on the axis X1. The axial span 50 has an outer surface 51. The curved portion 60 extends from the rearward side C2 of the axial bearing surface 50 and forms a raceway for the balls 23. The curved portion 60 has a running surface 61. flange 70 extends in a generally radial direction to the axis X1, the front side C1 of the axial span 50. The flange 70 has a convex surface 71 of the front side C1 and a concave surface 72 of the rear side C2. The flange 70 is provided to receive the diaphragm 7 in support of the front side C1, against the surface 71. The flange 70 further comprises an axial surface 73 15 connecting the surfaces 71 and 72. This surface 73 has an edge 74 located towards the inside the stop 10, the rear side C2 of the surface 73. The cover 4 and the edge 74 define a space 8 connecting the inside and the outside of the abutment 10. The sealing devices 30 and 40 are designed to isolate the chamber 28 and the balls 23, on the one hand to protect them from infiltrations of liquid or polluting particles 20 may come from outside the bearing 20, on the other hand to maintain the lubricant in the chamber 28. The sealing device 30 is located on the rear side C2 of the chamber 28. The device 30 comprises an insert 31 of metal and a seal 32 of elastomer. The insert 31 is fixed on the ring 21. The seal 32 comprises two sealing lips, one lip 25 disposed in contact with the ring 22. The sealing device 40 is located on the front side Cl of the chamber 28. The device 40 is provided to protect the chamber 28 against impurities that may enter the space 8. The device 40 comprises an insert 41 of metal and a seal 42 of elastomer. The insert 41 has an axial portion 43, a radial portion 44 and a frustoconical portion 45 interconnected. The seal 42 completely covers the insert 41 on the front side C1 and partially on the rear side C2. The seal 42 comprises a fastening portion 46, located at the axial portion 43 and adapted to be received in an internal groove 24 of the ring 21. The seal 42 also comprises two sealing lips 47 and 48, integral With the fixing portion 46. Alternatively, the device 40 may comprise two separate seals, each of which includes one of the lips 47 and 48.

The first lip 47 is disposed in contact with the axial bearing surface 50, more precisely with its outer surface 51. The lip 47 is radial, insofar as it is in radial contact with the ring 22. The lip 47 has a Hook shape curved towards the rolling chamber 28. The lip 47 is located at the portion 45 of the insert 41, at the inner end of the device 40. The second lip 48 extends from the front side C1 towards the flange 70 to one end 49, without contact between the lip 48 and the flange 70 when the stop 10 is in a rest configuration, as shown in Figures 1 and 2. The lip 48 extends axially recessed from the flange 70, with an axial gap formed between the lip 48 and the flange 70, more precisely between the end 49 and the edge 74. The lip 48 is said to be axial, insofar as it extends in a direction generally parallel to the axis X1 in the plane of Figures 1 and 2. Alternatively, the axial lip 48 may be inclined at an angle less than 45 degrees relative to the axis Xl. The lip 48 is disposed in a medial portion of the device 40, between the lip 47 and the ring 21. The lip 48 is more elongated than the lip 47 in a direction parallel to the axis X1. The lip 48 points towards the edge 74 of the flange 70. Thanks to its shape and its arrangement, the lip 48 makes it possible to improve the sealing of the abutment 10 on its front side C1. The lip 48 forms a labyrinth with the flange 70 and the cover 4, so as to stop the impurities that can penetrate through the space 8, 20 before they penetrate between the flange 70, the axial span 50 and the lip 47 In certain operating conditions, contact between the lip 48 and the flange 70 is likely to occur when the stopper 10 is in use. Nevertheless, under most operating conditions, the lip 48 is not in contact with the flange 70, which avoids an increase in the frictional torque and a deformation of this lip 48 in use. Figures 3 to 5 show other embodiments of a stop 10 according to the invention. Some elements are similar to the constituent elements of the first embodiment, described above, and bear the same numerical references. Other elements differ from the first embodiment and have numerical references increased by 100, 200 or 300. FIG. 3 shows the stop 10 provided with a sealing device 140, comprising an insert 41 and a The seal 142 includes a first lip 47 and a second lip 148. The lip 148 extends towards the flange 70 to an end 149, parallel to the axis X1, without contact between the lip 148 and the flange 70 when the abutment 10 is in a rest configuration. The lip 148 extends axially and radially beyond the flange 70, in particular the edge 74. Thus, the lip 148 3025265 6 extends partially through the space 8. A radial gap is provided between the lip 148 and the flange 70, especially between the end 149 and the surface 73. The lip 148 is more elongated than the lip 48 in a direction parallel to the axis X1. The lip 148 points through the space 8.

FIG. 4 shows the abutment 10 provided with a sealing device 240, comprising an insert 41 and a seal 242. The seal 242 comprises a first lip 47 and a second lip 248. The lip 248 is inclined at an angle a2 of the order of 20 degrees relative to the axis X1, away from the axis X1 and the range 50. Alternatively, the angle a2 can be between 0 degrees (inclusive) and 45 degrees (Excluded) so that the lip 248 may be termed an axial lip. The lip 248 extends towards the flange 70 to one end 249, without contact between the lip 248 and the collar 70 when the stop 10 is in a rest configuration. The lip 248 extends radially beyond the flange 70, at the edge 74. Thus, the lip 248 extends partially through the space 8. A radial gap is provided between the lip 248 and the lip 248. flange 70, especially between the end 249 and the edge 74. The lip 248 is longer than the lip 48 but less elongated than the lip 148, in a direction parallel to the axis X1. The lip 248 points through the space 8. FIG. 5 shows the abutment 10 provided with a sealing device 340, comprising an insert 41 and a seal 342. The seal 342 comprises a first lip 47 and a second lip 20 348. The lip 348 is inclined at an angle a3 of the order of 35 degrees with respect to the axis X1, away from the axis X1 and the bearing surface 50. The lip 348 extends in the direction of the flange 70 to one end 349, without contact between the lip 348 and the collar 70 when the stop 10 is in a rest configuration. Lip 348 extends back from flange 70, with an axial gap between lip 348 and flange 70, more precisely between end 349 and edge 74. Lip 348 is less elongated than lips 47 and 48 in a direction parallel to the axis X1. The lip 348 points towards the edge 74 of the flange 70. Moreover, the system 1 and the stop 10 can be shaped differently from FIGS. 1 to 5 without departing from the scope of the invention.

As a variant not shown, the system 1 has no cover 4 and spring 6. According to another variant not shown, the stop 1 is a swiveling abutment, as described for example in the document WO-A-2010/031756. According to another variant not shown, the stop 1 is a suspension stop adapted to equip a suspension system of a motor vehicle.

According to another variant not shown, the bearing 20 comprises rolling elements 23 other than balls, such as rollers or needles.

According to another variant not shown, the sealing device 30 may have a different configuration, for example comprise a single sealing lip. According to another variant not shown, the sealing device 40 may have a different configuration. For example, the first lip 47 may be an axial lip, disposed in contact with the rotating race 22. According to another example, the second lip 48 may be a radial lip, which extends towards the collar 70. Preferably , the first lip is radial while the second lip is axial, as in Figures 1 to 5.

In addition, the technical characteristics of the various embodiments and variants mentioned above may be, in whole or in part, combined with one another. Thus, the stop 10 can be adapted to the intended application. 15

Claims (12)

REVENDICATIONS1. Clutch release bearing (10) or motor vehicle suspension, this stop (10) comprising: a bearing (20) including a non-rotating ring (21) and a rotating ring (22) centered on a central axis (X1 ), as well as rolling elements (23) positioned in a rolling chamber (28) defined between the rings (21, 22), the rotating ring (22) including a radial outer collar (70); and a sealing device (40) mounted on the non-rotating ring (21), for protecting the rolling chamber (28) and the rolling elements (23) from infiltrations of liquid or polluting particles; characterized in that the sealing device (40) comprises both: a first lip (47) disposed in contact with the rotating ring (22), and a second lip (48; 148; 248; 348) which extends in the direction of the radial outer collar (70), without contact with this radial outer collar (70) when the stop (10) is in a rest configuration. 2. Stopper (10) according to the preceding claim, characterized in that the radial outer flange (70) has a convex surface (71) on a front side (C1) and a concave surface (72) on a rear side (C2) which is directed to the rolling chamber (28). 3. Stopper (10) according to one of the preceding claims, characterized in that the rotating ring (22) comprises an axial bearing surface (50) against which the first lip (47) is disposed in contact. 4. Stopper (10) according to one of the preceding claims, characterized in that a contact between the second lip (48; 148; 248; 348) and the radial outer collar (70) is possible when the stop (10). is in use. Stopper (10) according to one of the preceding claims, characterized in that the second lip (48; 148; 248; 348) is arranged in a central part of the sealing device (40) between the first lip ( 47) and the non-rotating ring (21). 3025265 9 Stopper (10) according to one of the preceding claims, characterized in that the second lip (48; 148; 248) is more elongated than the first lip (47) in a direction parallel to the central axis (X1). . 5 7. Stopper (10) according to one of claims 1 to 6, characterized in that in a cutting plane including the central axis (X1), the second lip (48; 148) extends parallel to the axis central (X1). 8. Stopper (10) according to one of claims 1 to 6, characterized in that in a cutting plane including the central axis (X1), the second lip (248; 348) is inclined relative to the central axis (X1). 9. Stopper (10) according to one of claims 1 to 8, characterized in that the second lip (48; 348) extends back from the radial outer flange (70), an axial gap 15 being formed between the second lip (48; 348) and the radial outer flange (70) in the rest configuration. 10. Stopper (10) according to one of claims 1 to 8, characterized in that the second lip (148; 248) extends beyond the radial outer flange (70), a radial gap 20 being formed between the second lip (148; 248) and the radial outer flange (70) in the rest configuration. 11. System (1) clutch-disengagement or suspension of a motor vehicle, equipped with a stop (10) according to one of claims 1 to 10. 25 12. A method of manufacturing a stop (10) according to one of claims 1 to 8, characterized in that the method comprises at least the following steps: a) manufacture the non-rotating ring (21), the rotating ring ( 22) and the rolling elements (23) of the bearing (20); B) manufacturing the sealing device (40), including the first lip (47) and the second lip (48; 148; 248; 348); c) mounting the sealing device (40) on the non-rotating ring (21) of the bearing (20), with the first lip (47) being arranged in contact with the rotating ring (22) and the second lip (48); 148; 248; 348) extending in the direction of the radial outer flange (70), without contact with said radial outer flange (70).