FR2735194A1 - CONNECTION SYSTEM BETWEEN A PULL-OUT AND ITS MOUNTING PART - Google Patents

Abstract

Pulled clutch bearing comprising a bearing 1 provided with a rotating inner ring 4, a non-rotating outer ring 5 and rolling elements 6 arranged between said rings, a docking piece 14 capable of cooperating with a disengaging and mounted concentrically around a connecting surface 4a of the rotating ring using an elastic securing member 15. The connecting surface of the rotating ring comprises an annular waiting groove 18, an annular groove of retained 19 and a conical portion 17 connecting the holding groove to the connecting groove, the diameter of the bottom of the connecting groove being substantially equal to the diameter of the bottom of the holding groove. The docking part 14 comprises an annular groove 14a with radial side surfaces 14d, 14e and a cylindrical bottom on which at least a portion of the securing member is prestressed.

Description

Connection system between a pulled stop and its docking part.

  The present invention relates to a so-called pulled clutch stop, that is to say acting in traction on the diaphragm of a device.

vehicle disengage.

  The pulled stops work in permanent contact with the rear face of the diaphragm of the declutching device by means of the docking part which provides an axial connection between the bearing of the stop and the diaphragm. A slight axial preload exerted at the level of the stop in the direction of declutching ensures permanent axial contact between the different parts.

  presence between the stop and the diaphragm.

  The stops pulled in general comprise a guide sleeve made of synthetic material which can move axially on a guide tube made integral with the vehicle gearbox, a cover making it possible to transmit the forces of an actuating member, in the form of 'a fork for example, to a bearing mounted on the guide sleeve. The bearing transmits the declutching force exerted by the fork to the diaphragm of the declutching device. The guide sleeve may include an inner tubular part intended to slide on the guide tube and an outer tubular part used for centering the guide sleeve in the cover. The guide sleeve is secured to the cover by appropriate means. The inner and outer tubular parts of the

  sleeve can be joined by a radial flange.

  The cover may include a cylindrical annular part for centering the guide sleeve, a part extending radially inwardly situated at one of its ends and serving as a support for the non-rotating ring, and two radial ears s' extending outward at its other end and serving as support walls for the

actuation range.

  The bearing is in contact with the guide sleeve via its non-rotating outer ring, which receives the axial disengaging force from the fork via the cover and transmits said force to the rotating inner ring, which transmits it in turn to the diaphragm of the declutching device via the docking part mechanically linked to both

  diaphragm and rotating ring.

  There are a number of technical issues to be resolved in order to ensure the proper operation of the clutch pull bearings. In particular, it is necessary to correctly carry out the operation of coupling the stop on the docking part. The success and the ease of the coupling operation depend in particular on the good pre-centering of the mechanical coupling member generally constituted by a split elastic ring, also called a rod, relative to the docking part. It is therefore necessary that the rod is already perfectly centered on the part which supports it, that is to say on the

  rotating inner ring of the thrust bearing.

  French patent application No. 2 708 064 discloses a clutch pulled stop comprising a bearing and a docking part capable of cooperating with a declutching device and mounted concentrically around a connection surface of the ring.

  rotating using an elastic fastening ring.

  The connecting surface of the rotating ring comprises an annular waiting groove, an annular connecting groove and a conical portion connecting the waiting groove to the connecting groove, the diameter of the groove bottom of the connecting groove at the diameter of

  throat bottom of the waiting throat.

  The docking part has an interior annular housing with an adjacent step which extends radially inwards by defining a circular opening whose diameter is slightly greater than the diameter of the connection surface of the rotating ring, and a conical portion interior adjacent to the step and which flares out

moving away from the step.

  The rod is made from a metal wire whose profile in the free state has internal sectors and external sectors, of different curvatures, and distributed in circumferential alternation, the profile being between a circle inscribed in the internal sectors and a circle circumscribed to the external sectors, the circles being concentric with each other, the diameter of the circle inscribed

  being less than or equal to the diameter of the bottom of the holding groove.

  Certain problems may arise when mounting the stopper on the docking part. In fact, in the assembly process generally used in automobile manufacturers, the clutch stop is coupled to the docking part integral with the diaphragm after the gearbox has been fixed on the engine block. The abutment is coupled to the docking part, by operating the abutment axially towards the docking part and then in the opposite direction using the control member of the abutment. During the assembly operation, the rod passes the step and gradually descends into the groove. As the coupling operation is done "blind" (the stop and the docking part are inside a casing), nothing indicates that

  the operator that the rod, has taken its correct position in the groove.

  On the other hand, after the coupling operation, the engine / gearbox subassembly thus formed is transferred to the vehicles to be mounted there. During this transport operation, the fork may be accidentally moved. This is how the rod can descend into the waiting throat if it has been badly engaged in the throat and has remained

blocked, for example, on the step.

  The rod can also, under the action of an untimely operation of the fork, be made to slide axially in the cylindrical bore extending the groove of the docking part and

  then partially expands in the rounding of the docking part.

  The rod, thus accidentally positioned outside the area intended to receive it, can also go awry and have difficulty returning to its correct positioning during

axial operation of the stop.

  The object of the present invention is to remedy the drawbacks of existing solutions by proposing an effective means of pre-centering the rod on the rotating ring of the bearing without adding additional parts and which allows, after the coupling operation of the stop on the part d docking, to use the entire periphery of the rod to transmit the axial disengagement force between the

stop and docking piece.

  The invention also relates to a clutch pulled stop comprising means for pre-centering the part.

  on the rotating inner ring of the bearing.

  The subject of the invention is also a clutch pulled stopper comprising means of connection between the docking part and the rotating ring of the stopper making it possible to ensure a good rotational connection of these two parts even under low load.

axial.

  The subject of the invention is also a clutch pulled bearing, the positioning of the ring of which is carried out without risk of malfunction and the positioning of which is insensitive to a

possible untimely maneuver.

  According to the invention, the clutch bearing comprises a bearing provided with a rotating inner ring, an outer non-rotating ring and rolling elements arranged between the rings, and a docking part capable of cooperating with a device. clutch and concentrically mounted around a connecting surface of the rotating ring using an elastic fastening member. The connecting surface of the rotating ring comprises an annular holding groove, an annular retaining groove

  and a conical portion connecting the waiting groove to the connecting groove.

  The diameter of the bottom of the connecting groove is greater than the diameter of the bottom of the holding groove. The docking piece comprises an annular groove with radial lateral surfaces and a cylindrical bottom on which at least a portion of the fastening member is prestressed. Thanks to the invention, the passage of the rod in the retaining groove of the docking piece is made in a frank and perceptible manner

  by the operator who realizes the correct assembly of the rod.

  In one embodiment of the invention, the fastening member is a wire of circular section, and the cylindrical annular groove of the docking piece comprises a first radial surface known as a coupling of depth substantially equal to the radius of the wire constituting the securing member and a second radial surface known as a retaining depth less than the depth of the

  first radial coupling surface.

  The retaining groove of the rotating ring advantageously comprises radial lateral surfaces and a cylindrical bottom on which at least a portion of the securing member is prestressed. With such a clutch stop, the operator who proceeds to assemble the assembly clearly perceives the passage of the rod in the retaining groove of the docking part and then in the retaining groove of the rotating ring. After the two "clicks" due to the passage of the rod in the two grooves, the operator is assured of the correct assembly of the rod. The retaining groove of the rotating ring may comprise a first radial surface known as a coupling depth of substantially equal to the radius of the wire constituting the fastening member and a second radial surface known as retaining depth less than the depth of the first surface radial coupling. In one embodiment of the invention, in the coupling position, the grooves of the rotating ring and of the docking part being opposite one another, the coupling surface of a groove is opposite the surface of restraint of the other throat. Preferably, each lateral retaining surface of a groove is connected to a span

  adjacent cylindrical outside the groove.

  The invention will be better understood on studying the description

  detailed of an embodiment taken by way of non-limiting example and illustrated by the appended drawings in which: FIG. 1 is a view in axial section of a clutch pulled bearing according to the invention, FIG. 2 is a view of detail of figure 1, and

  Figure 3 is an axial view of the connecting rod.

  In the example illustrated in the figures, the clutch pulled stop according to the invention comprises a bearing 1, a cover 2 and a guide sleeve 3. The bearing 1 comprises a rotating inner ring 4 which is extended axially by a bearing 4a, a non-rotating outer ring 5 cooperating with an end portion of the inner ring 4, opposite the connecting surface 4a, by means of a row of balls 6 held with

  regular circumferential spacings by an annular cage 7.

  An annular flange 8, crimped onto the outer surface of the non-rotating outer ring 5, seals between the ends of the inner 4 and outer 5 rings. A seal of deformable material is interposed between the end of the outer ring 5 and the annular flange 8. The second end of the outer ring 5 is bent radially inward and can come into axial contact with a

  inner radial side 2a of the cover 2.

  The annular cover 2 also has a tubular part 2b and two diametrically opposite ears 2c extending radially inwards and located opposite the radial flank 2a. At the ears 2c, the cover 2 is protected by staples 9 made of metal sheet which provides support surfaces for an actuating fork 9a. Via the ears 2c coated with clips 9, the fork 9a

axially actuates the cover 2.

  The guide sleeve 3 can be made in a single piece of molded plastic which includes an inner tubular part 10 capable of sliding axially on a guide tube O10a, made integral with the gearbox of the vehicle not shown. The sleeve 3 further comprises an external tubular part 11 which is made integral with the internal surface of the tubular part 2b of the cover 2. A radial flange 12 of the sleeve 3 joins the internal tubular parts 10 and external 11. The radial flange 12 comprises, in the vicinity of the external tubular part 11, several internal elastic fingers 13 extending axially so as to be in contact with the external surface of the non-rotating ring 5 which is

  protected by the annular sealing flange 8.

  The rotating inner ring 4 of the bearing 1 is mechanically coupled to a docking part 14 by means of an elastic securing ring 15, according to a technique described below. The docking piece 14 is angularly and axially linked to a diaphragm 16 produced in the form of a disk with radial blades

for example.

  The pulled stop is subjected, in operation, to a slight axial preload permanently (from left to right of FIG. 1) by the fork 9a on the staples 9. During the declutching operation, the fork 9a exerts a force declutching on the eyelets 2c of the cover 2 so as to move the stop axially along the guide tube 10a by sliding the guide sleeve 3 on the guide tube 10a. The declutching force is transmitted via the cover 2 to the non-rotating outer ring 5 of the bearing 1 which, in turn via the rotating inner ring 4, the retaining ring 15 and the part d docking 14, transmits the declutching force to the diaphragm 16. Thanks to the radial flexibility of the elastic fingers 13 of the guide sleeve 3 which are in contact with the outer surface of the non-rotating ring 5, the bearing 1 can move radially and focus

  automatically with respect to the axis of rotation of the diaphragm 16.

  The connecting surface 4a of the rotating inner ring 4 has a waiting groove 18 intended to receive the rod 15 in the waiting position until the coupling operation, and a connecting groove 19 intended to receive the rod 15 during the coupling operation and to achieve with the latter the connection between the rotating inner ring 4

and the docking part 14.

  The connecting groove 19 is axially offset towards the free end of the rotating ring 4 relative to the waiting groove 18. The two grooves 18 and 19 are annular and connected together by a conical portion 17. The connecting groove 19 comprises a cylindrical bottom limited by a first radial surface 19b which is connected to a cylindrical seat 19a adjacent to the conical portion 17. The difference in radius between the cylindrical seat 19a and the bottom of the connecting groove 19, which corresponds to the depth of the connection groove 19 on the side of the radial surface 19b is less than the radius of the wire constituting the rod 15. Opposite the radial surface 19b, the bottom of the connection groove is limited by a second surface radial 19c which is connected to a cylindrical bearing surface 20 outside the connecting groove 19. The depth of the connecting groove 19 is, on this side,

  substantially equal to the radius of the rod 15.

  The docking piece 14 has an annular internal groove 14a composed of a cylindrical surface connecting by a first radial surface 14d to an adjacent cylindrical surface 14b. The cylindrical surface 14b projects radially inwardly relative to the inner groove 14a and delimits a circular opening whose diameter is slightly greater than the outside diameter of the connecting surface 4a of the rotating ring 4 of the stop. The docking piece 14 has, a conical inner surface 14c adjacent to the cylindrical surface 14b and which flares away from the cylindrical surface 14b and opposite the radial surface 14d, a second radial surface 14e which limits the internal groove 14a forming a cylindrical groove. The radial surface 14e is connected to a cylindrical surface 14f outside the internal groove 14a. The difference in radius between the bottom of the groove 14a and the cylindrical surface 14b, in other words the depth of the groove 14a on the side of the radial surface 14d is substantially equal to the radius of the wire constituting the rod 15. In contrast, the throat depth 14a of

  side of the radial surface 14e is less than the previous value.

  The rod 15 is made, for example, from a spring steel wire of circular section. The rod 15 has a profile with external sectors 15a and internal sectors 15b. The external sectors 15a and internal 15b are arranged alternately along the profile of the rod 15 and comprised between two concentric circles: a circle inscribed 20 in the internal sectors 15b and a circumscribed circle 21 in the external sectors 15a. The external sectors 15a have an arcuate profile. The internal sectors 15b may have a substantially flat or slightly curved profile with a radius of curvature greater than the radius of curvature of the external sectors 15a. The spring steel rod 15 has two non-contiguous ends. Preferably, the internal sectors 15b have dimensions

  lower circumferential compared to external sectors 15a.

  The concentric circles inscribed 20 and circumscribed 21 have a difference in radius which must be greater than the diameter of the wire making up the rod 15. The internal sectors 15b tangent to the inscribed circle 20 and the external sectors 15a tangent to the circumscribed circle 21. The internal diameter of the waiting groove 18 and the adjacent external diameter of the axial bearing 4a of the rotating ring 4 are such that the rod 15 comes to center on the bottom of the waiting groove 18 with zero radial clearance or a slight radial prestress , and that the external sectors 15a of the rod 15 are radially projecting relative to the external diameter of the axial bearing 4a of the ring

rotating 4.

  During the coupling operation of the docking piece 14 on the connecting surface 4a of the rotating inner ring 4 of the stop, an axial pushing force is exerted on the rotating inner ring 4, using the fork 9a on the radial tongues 9b of the clips 9. The connecting surface 4a of the rotating inner ring 4 moves axially towards the docking part 14 passing through the interior of the circular opening delimited by the cylindrical surface 14b of the docking piece 14. The rod 15, locked axially in the waiting groove 18, is constricted radially by the conical inner surface 14c of the docking part 14 and the external sectors of the rod 15 are radially erased in the waiting groove 18 to allow the passage of the cylindrical surface 14b whose diameter is slightly greater than the diameter of the connecting surface 4a of the rotating ring 4. After the passage of the cylindrical surface 14b of the part d docking 14, the rod 15 suddenly expands perceptibly by an operator and the external sectors 15a are in the groove

  interior 14a of the docking part 14.

  The direction of operation of the stop is then reversed, the rod 15 remains axially blocked in the internal groove 14a of the docking part 14 by its external sectors 15a which have larger circumferential dimensions than the internal sectors 15b and come into abutment on the radial surface 14d connecting to the inner groove 14a. The conical portion 17 connecting the waiting groove 18 to the connecting groove 19 then forces the rod 15 to expand radially inside the docking piece 14 in the area of the internal sectors 1 5b and to be taken gradually a circular shape, the radial surface 14d constituting an axial abutment for the rod 15 during the axial movement of the conical portion 17. The rod 15, after having moved along the cylindrical seat 19a, shrinks sharply perceptibly by a operator finally coming to position in the connecting groove 19 of the inner ring 4 and takes a substantially circular shape by matching the shape of the connecting groove 19 and the complementary shape of the inner groove

14a of the docking part 14.

  The radial surface 19b which is connected to the cylindrical bearing surface 19a prevents the rod 15 from returning to the conical portion 17 of the rotating ring in the event that the stopper is accidentally actuated so that the connecting groove 19 of the rotating ring 4 and the internal groove 14a of the docking piece 14 comes to temporarily move away axially from one another. Similarly, the radial surface 14e connecting to the cylindrical surface 14f prevents the rod 15 from accidentally coming out of the internal groove 14a of the docking part and engages on the surface

cylindrical 14f.

  Thanks to the invention, the passage of the rod, in the retaining groove of the docking part and then in the retaining groove of the rotating ring of the stop is made in a straightforward manner and is accompanied by a click perceptible by the operator who is thus notified of the success of the operation. The radial surfaces delimiting each groove constitute sufficient stops to prevent that, once in place, the rod escapes from the connecting groove, inter alia, under the effect of a shock or untimely operation of the fork. The cylindrical bearing surfaces adjacent to the radial retaining surfaces of the rod reinforce these when they serve as a stop and avoid masting and sagging

of these parts.

Claims (6)

  1. Pulled clutch bearing comprising a bearing (1) provided with a rotating inner ring (4), an outer non-rotating ring (5) and rolling elements (6) disposed between said rings, and a part docking (14) capable of cooperating with a declutching device and mounted concentrically around a connecting surface (4a) of the rotating ring using an elastic securing member (15), the connecting surface of the rotating ring comprising an annular waiting groove (18), an annular retaining groove (19) and a conical portion (17) connecting the waiting groove to the connecting groove, the diameter of the bottom of the connection being greater than the diameter of the bottom of the waiting groove, characterized in that the docking piece (14) comprises an annular groove (14a) with radial lateral surfaces (14d, 14e) and with a cylindrical bottom on which at less a portion of the securing member (15) is prestressing.   2. clutch pulled bearing according to claim 1 wherein the securing member (15) is a wire of circular section, characterized in that the cylindrical annular groove (14a) of the docking part (14) comprises a first radial surface (14d) called a coupling surface of depth substantially equal to the radius of the wire constituting the fastening member, and a second radial surface (14e) called a retaining depth less than the depth of the   first radial coupling surface (14d).   3. clutch pull bearing according to claim 1 or 2, characterized in that the retaining groove (19) of the rotating ring (4) comprises radial lateral surfaces (19b, 19c) and a cylindrical bottom on which at minus a portion of the organ of   joining (15) is prestressed.   4. Pulled clutch bearing according to claim 3, characterized in that the retaining groove (19) of the rotating ring (4) comprises a first radial surface (19b) said coupling hitch of depth substantially equal to the radius of the wire constituting the fastening member (15) and a second radial surface (19c) called retaining depth less than the depth of the first radial coupling surface (19b).   5. Clutch pull bearing according to claim 4, characterized in that, in the coupling position, the grooves of the rotating ring (4) and of the docking part (14) being opposite one another, the surface d of a groove is opposite the surface of restraint of the other throat.   6. clutch pull bearing according to claim 5, characterized in that each lateral retaining surface (14e, 19c) of a groove is connected to an adjacent cylindrical seat (14f, 20) in out of the throat.