FR2653388A1 - DEVICE FOR CONTROLLING A CLUTCH, IN PARTICULAR FOR A MOTOR VEHICLE. - Google Patents

Abstract

The present invention relates to a device for controlling a clutch, of the type comprising a cable (504) hooked and wound on a rotating member (532) carried by a support (551). According to the invention, the support (551) carries a shoulder (10,161), to support elastic means urging an intermediate sleeve (30) towards a coupling part (40) integral with the cable (504). The sleeve (30) is mounted telescopically with respect to the part (40) with the intervention of disengageable locking means (50) between said parts. The bush (30) is shaped to receive a second section (60) of a wheelhouse. Automotive vehicle application.

Description

The present invention relates to control devices of a

  clutch, in particular for a motor vehicle, of the type comprising, for the operation of a disengaging member intended to act on the disengagement device of a clutch, a cable hooked and wound on a movable member in rotation and adapted to cooperate with a member fixed in rotation through means of complementary ramps provided on said members, and a support of said movable member intended to be

fixed on a fixed part.

  Such a device is described in the documents FR-A-1 587 732 and EP-A-0 322 265, the support being secured to the fixed member in rotation in the document FR-A-1 587 732, whereas the document EP-A-1 587 732 0 322 265 he

is distinct from it.

  A mounting problem arises in this type of construction, because the cable is carried by the control device and must be subsequently mounted on an organ

  operating mechanism, such as a clutch pedal.

  Indeed, particularly in the case of a motor vehicle, it is easier on assembly lines to assemble the wheelhouse, which owns said cable, on the actuator, and then on

  the integral control device of the motor unit

gearbox.

  In addition, it is imperative, given the various manufacturing tolerances, to set the linkage to length, especially when a wear compensator is provided, to prevent the setting to length of the cable, causing a certain variable stroke of one realization to the other, is taken on the race wear rattrap. In addition, it is preferable that the cable is

permanently on.

  The object of the present invention is to create a new cable control device mounted on a movable member in rotation, which meets these requirements and therefore which facilitates easy assembly of the wheelhouse, while at the same time making it easy and economical to set the live length thereof and providing other advantages. According to the invention, a disengaging device of the aforementioned type is characterized in that the support of the movable member carries a shoulder for supporting elastic means urging an intermediate bushing towards a coupling piece secured to the cable, in that the intermediate bushing is mounted telescopically with respect to the coupling part with interlocking locking means intermeshing between said parts and in that the intermediate bushing is shaped to receive a second

section of a wheelhouse.

  Thanks to the invention and in particular the elastic means, the tensioning device under tension of the wheelhouse is integrated with the control devices and can be mounted on the second section already assembled.

  in advance with the actuator.

  This second trunk may comprise a cable and / or

rods.

  Alternatively, it may also include a

hydraulic part.

  In addition, thanks to the locking means

  disengageable a subsequent disassembly is made possible.

  Advantageously, said means present for this

to make some means of prehension.

  According to a feature, said locking means comprise a sleeve adapted to cooperate with balls jammed by frustoconical bearing surfaces or with pawls, said sleeve having an outer surface

grasping shoulder.

  Pulling on the sleeve can thus release the balls or pawls and the coupling part. According to another feature, in the storage position, unassembled linkage, retractable holding means are provided to hold the sleeve. It may be a retractable abutment mounted on the intermediate sleeve and resting on a shoulder of the

support of the control device.

  Alternatively the socket can be retained

indirectly by pinching.

  Thus, during storage, it is possible to keep the elastic means under tension and then, after assembling the sections of the wheelhouse, to retract said means of

maintenance.

  The following description illustrates, as a

  for example, the invention with reference to the accompanying drawings in which: Figure 1 is an axial sectional view identical to Figure 12 of EP-A-0 322 265; - Figure 2 is a sectional view similar to Figure 13 of the aforementioned document; - Figure 3 is a schematic view identical to Figure 14 of the aforementioned document; - Figure 4 is a schematic view of the second section of the wheelhouse according to the invention; Figure 5 is an axial sectional view identical to Figure 2 for the storage position of the control device according to the invention, the second section being assembled; - Figure 6 is a view showing the retractable stopper according to the invention; - Figure 7 is a view similar to Figure 5, after retraction of the retractable stop, the clutch being in the engaged position; - Figure 8 is a view similar to Figure 7, the clutch being in the disengaged position; - Figure 9 is a partial view similar to Figure 8, for a second embodiment; FIG. 10 is a partial view similar to

  Figure 9 for a third embodiment.

  The control device described here by way of example, is similar to that described in EP-A-0 322 265, considered incorporated herein.

description.

  For the record (FIGS. 1 to 3), it will be recalled that the driving part comprises a part 531 provided with means of ramps, here helical, for cooperation with means of complementary ramps carried by a part

  conducted 532 with the interposition of beads 570.

  The part 531 is free to rotate a part 600. This part is associated with a flange 533 carrying a toothed pawl 601 passing through an opening 602 to

  meshing with teeth, presented in Exhibit 531.

  A spring 603 rests on the parts 600-533.

  The flange 533 is mounted to articulation on the

piece 600 hollowed for this purpose.

  A spring 604 is interposed axially between the part 600 and a shoulder 605 of the driven part, to allow a constant support of the release member 1 (in the form of stop) against the diaphragm 500, pivotally mounted on the cover 610 clutch

legs 611 from it.

  This diaphragm 500 belonging to the disengagement device of the clutch bears on a pressure plate 612 for clamping a friction disc (not shown) between said plate 612 and a reaction plate (not shown) integral with the shaft. engine of the

motor vehicle.

  The friction disk is rotationally fixed

  the input shaft of the gearbox 615.

  Reference 616 indicates an intermediate piece fixed to the gearbox and on which the flange 552 is engaged by centering by means of bosses 617. The flange 552 of the support means 551 has an axial return 620 on which engagement is made. the inner ring of an angular contact ball bearing whose outer ring is constituted by the driving part itself. Elastic means 512 assemble the abutment 1 to a flange 520 of the driven member 532 and here consist of a corrugated washer resting on the flange 520 and provided with axial tabs through the central opening of the flanges 520, 51, each of they have at its end a hook coming to bear on the flange 511, as described in Figure 8 of the document

FR-A 2,337,231.

  The support means 551 hereinafter referred to as the support of the control device, adapted to be fixed on the gearbox 615, comprise a cover 554 and a bottom with a wall 553 and the flange 552, and one sees in 630 means of clips in the form of hooks and teeth provided between the cover 554 and the wall 553, all

  both advantageously plastic.

  Referring to Figure 3 we see that in the clutch engaged position, the pawl 601 is not in contact with the teeth of the driving part 531, because it bears on a stop 631, wedge-shaped

  inclined wall 553, under the action of the spring 604.

  It is therefore the abutment 631 which allows the lifting

flange 533 or ratchet.

  In the disengaging position, the action of the cable 504, reinforced by that of the spring 603 having a central lug covering the groove of the pivoting flange 533 and two lateral lugs resting on said flange on either side of the groove 535 for the passage of the cable

  504, allows a tilting of the pawl 601.

  Note that the spring 603 has an opening for passage of the attachment head 505 of the

cable 504 secured thereto.

  As can be seen in FIG. 2, the flange 533 has a groove 535 for the passage and winding of the cable 504 and the head 505 naturally rests on

  the shoulder formed at the end of the groove 535.

  At the exit of said groove 535 the cable 504

  extends globally tangentially.

  The 603 spring has a wing overall

  radial cooperating with a groove of the workpiece 600.

  For its pivoting flange 533 is provided on either side of its groove 535, with circular lugs 632 cooperating with the outer periphery of the part 600 provided with a recessed flat portion, connected by a ramp to the main part of the outer periphery of

said piece 600.

  Thus the clutch control device, for the operation of the disengagement member 1 intended to act on the disengagement device 500 of the clutch, comprises a support 551 of said disengaging member, intended to be fixed on a fixed support in translation, control means carried by the support and comprising a member movable in rotation 531 and here fixed in translation, intended to be subjected to actuating means, here comprising the cable 504 wound and hooked by its

  head on the flange 533 of the movable member.

  These control means also comprise a driven member 532 movable in translation and fixed in rotation

  via a tangential tongue 563.

  It is this piece that carries the stop 1.

  Additional ramp means are provided on said parts with balls 570, for driving the member driven by the driving member and axial displacement of the driven member relative to the support 551. The driving member and the member conducted are hollow by being mounted coaxially, the driving member 531 carrying at its outer periphery engagement means,

for engagement with the 504 cable.

  The driven member is mounted in the axial extension of the driving member, being connected in rotation to the

  support 551 by means of rotating connection.

  In FIG. 1 these means consist of a tangential tongue 563 fixed to a transverse portion 562 of the driven piece 532 as well as to

support 551.

  The driven member 531 carries at its inner periphery

  a support portion 520 for coupling the abutment 1.

  Thus a rotation of the drive member causes an axial displacement of the driven member in particular thanks to

means of ramps and balls 537.

  According to the invention the support 551 of the movable member 531,600,533 carries a shoulder 10 for support of elastic means 20 urging an intermediate bushing 30 towards a coupling part

integral with the cable 504.

  The intermediate bushing 30 is mounted telescopically with respect to the coupling part 40 with the intervention of the disengageable locking means.

between said pieces.

  The bushing 30 is shaped to receive a second section 60 of the wheelhouse, the first of which

  section is constituted by the cable 504.

  More precisely, referring to FIG. 4, it can be seen that the second section 60 is intended to be connected to a clutch pedal 61 at the disposal of the user, said pedal constituting the operating member

of the clutch. -

  This section here comprises a cable 63 sliding inside a guide sheath 64, interposed between two fixed points, while the cable 63 presents to its

  end a shouldered stem 65 having an opening 66.

  Thus on a chain, this second section 60 is assembled in advance to the pedal 61, while the control device is fixed by its support 551 on

the fixed gearbox.

  Note that a retractable stop 70 is engaged in a groove 71 of the sleeve 30, said stop

bearing on the shoulder 10.

  Thus, this stop 70 makes it possible to keep the elastic means 20 in storage (unassembled wheelhouse) compressed, here in the form of a coil spring, resting on the shoulder 10, more precisely on the face thereof turned in direction of the coupling piece 40, and opposed to the outer face on

which supports the stop 70.

  As shown in Figure 6, this stop consists of an elastic pin generally shaped like a bishop's stick. Alternatively one could provide a pin or

a circlip.

  The shoulder head 65 is mounted on the sleeve 30 also with a stop 67 similar to the stop 70, the difference being that this stop engages in the hole 66. The coupling piece 40 consists of a rod

  smooth shoulder 42 and secured to the cable 504.

  This rod is supported in engaged clutch position and storage as described below on a shoulder 41 that has the support 551 in the form of housing. This support is provided with a chimney 2 in alignment with the rod 40 and acting as a guide for the spring 20, which bears on a shoulder 31 that

  presents the socket at its lower end.

  The chimney 2, also visible in Figure 1, is closed in part by the cover 554 (Figure 1) of the housing. It will be appreciated that, thanks to said cover, easy assembly, in particular of the bushing 30 and the spring

, is possible.

  This sleeve 30, forming a traction sleeve, is provided in the vicinity of this lower end with housings 32 having a frustoconical bearing surface for receiving balls 33, adapted to cooperate with the rod.

smooth 40.

  More specifically, the housings 32 are in the form of grooves with a frustoconical bearing, inclined in the direction of the axis of the assembly and directed towards the head, said frustoconical bearing being connected to a spherical portion adapted to the dimension of the associated ball 33,

  said portion being connected to a vertical portion.

  The ball 33 is mounted with clearance, with respect to said spherical portion and is adapted to be stuck

by the frustoconical portion.

  A sleeve 51, housed inside the sleeve being centered and guided by it, serves as a cage

to the balls 33.

  This sleeve, at its end opposite the balls 33, has a shoulder 52 protruding from the sleeve 30 by bearing on the end of said sleeve, said sleeve 51 constituting a sleeve

extraction.

  This shoulder also serves as support for the stem

shouldered 65.

  As will be understood, this sleeve 51 and the balls 33 mounted in their housing 32 belong to

  with the disengageable locking means 50.

  The device operates as follows.

  In a first step, the support 551 being fixed on the gearbox and the section 60 being mounted on the pedal 61, the head 65 is assembled to the bushing 30, thanks to the stop 67 engaged in the hole 66 and passing through the sleeve 51 from one side to the other,

  which has for this purpose openings passage.

  Note that previously the cable 504 with its rod was telescopically mounted on the sleeve 30, said rod 40 being able to penetrate inside the sleeve 30 and the sleeve 51. In this configuration the balls 33 are not jammed . The sleeve 30 being

immobilized by the stop 70.

  It will also be noted that the part 600 bears against a shoulder 631 'under the action of the preloading spring 604, and that the flange 533 is lifted by means of a spring 700, here a blade, secured to the piece 600 and

  bearing on flange 533, at the end of it

next to the ratchet 601.

  It will be noted that the spring 603 'of configuration similar to the spring 603 but devoid of central branch, serves only for the rotary connection of the

flange 533 with piece 600.

  In the storage position, the sleeve 30 is generally in the position it occupies in position

  maximum clutch (clutch disengaged).

  After assembly of the portion 60, the abutment 70 is removed, which allows a relaxation of the spring 20 and a jamming of the balls 33, with certainty later after the first clutching operation (FIG. 8), between the rod 40 and the bearings frustoconical of their associated housing 32 with relative axial movement of the sleeve 30 relative to the rod 40 allowed

by dwelling 32.

  In this position the flange 533 is still

raised.

  Thus, considering FIGS. 5 and 7, it can be seen that the part 30 has come down from the distance A, which allows the section 60 to be lengthened, this section 60 being preferably under slight tension, the pedal 61 then bearing on a fixed stop 68. It will be noted that the cable 504 is dimensioned as a function of the circumferential distance separating the shoulder 41 from the abutment 631 ', the length of the cable being such that in this position the pawl 601 is raised by the spring 700, while the piece 40 bears against the shoulder 41 and the piece 600 against the

stop 631 'of the support 551.

  It will be appreciated that the abutment 631 'is a simple shoulder and that the abutment 631' and the shoulder 41 advantageously replace the wedge-shaped abutment 631 of FIG. 1. The distance, taking into account the presence of the flange 533, between said stop 631 'and said shoulder 41 is easily calculable, the cable 504 being

  slightly stretched for the configuration of Figure 7.

  When disengaged, pulling on the cables 63, 504 and moving the pulling sleeve 30, as shown in FIG. 8, the pawl 601 engaging with the driving member 531, the workpiece 600 moving and

leaving its stop 631 '.

  To disassemble simply pull on the extraction sleeve 51 and more precisely to act on the shoulder 52 forming gripping means, to shoot the balls 33, loosen and thus unlock the assembly. Note that it is possible to disassemble the head 65 by removing the stop 67 before or after firing

the shoulder 52.

  Then the traction action on the sleeve 51 is continued over a distance such that it can allow the resetting of the abutment 70 and then afterwards it becomes possible easily to detach the

section 60.

  Thus, thanks to the invention, the control device of the clutch abutment 1 is easily mountable and dismountable relative to the second section 60 of the wheelhouse. Furthermore, thanks to the elastic means 20, the tensioning length of this second section can be easily achieved and the disengageable locking means 50

  allow for easy disassembly later.

  Of course the present invention is not

  limited to the embodiments described.

  In particular FIG. 9, the sleeve referenced at 151 can be centered by the chimney 2 and surround with play.

the socket 30.

  This sleeve 151 has at its internal periphery a transverse return 152, then an axial return 153 to bypass the end of the sleeve 30, said return 153

serving as cage for the balls 33.

  This sleeve 151 is provided with oblong openings 154 each traversed by screws 160 carrying a ring

  161, said screws also passing through the chimney 2.

  As will have been understood, the ring 161 constitutes the shoulder 10 of FIG. 5 and is therefore reported by

the screws 160 on the support 551.

  The screws 160 serve to hold the sleeve 30 by pinching the sleeve 151 between the chimney 2 and

the ring 161.

  In fact, in the storage position (unassembled linkage), the compressed spring 20 is maintained by

pinching the sleeve 151.

  After assembly of the portion 60, it deserves therefore

the screws 160.

  To disassemble simply pull on the collar 157 of the sleeve 151, then lock

  again by pinching said sleeve 151.

  Thus, as in FIG. 5, it consists of retractable holding means holding the bushing 30 in the storage position, said means possibly comprising the retractable stop 70 or alternatively comprising the screws 160 for indirectly holding the bushing 30 by

pinching the sleeve 151.

  In variant 10, the locking means may comprise pawls, in this case the rod 40 has a toothed end 201 with which is adapted to cooperate pawls 202 rotatably mounted on the

socket 30.

  The sleeve 251 is traversed by said pawls

  and serves to disengage them.

  In a variant instead of balls 33, it is possible to provide a washer of the "Belleville" type that is wedged by

  bracing and that one decoince with the help of a sleeve.

  Naturally, the invention is applicable to the devices described in the aforementioned document FR-A-1 587 732, the ramp means may not

have balls.

  Similarly, the presence of the pawl is not essential, the rotatable member being able to be in one piece, as in FIGS. 4 and 9 of FIG.

EP-A-0 322 265.

  The elastic means may comprise a stack of washers "Belleville", instead of a spring

in pudding.

  The gripping means associated with the extraction sleeve may comprise holes for attachment

an extraction tool.

  The stop 67 may consist as the stop 70 in

a pin, screw or the like.

  Finally it is possible to reverse the role of the sleeve 30 and the coupling piece 40, said sleeve 30 may have a penetrating nose

  telescopically inside the room 40.

Claims (6)

  1) Device for controlling a clutch, in particular for a motor vehicle, of the type comprising, for the operation of a disengaging member (1) intended to act on the disengagement device (500) of a clutch, a cable (504 ) hooked and wound on a rotatable member (531) and adapted to cooperate with a fixed member in rotation (532) through means of complementary ramps provided on said members, and a support (551) of said movable member ( 531) intended to be fixed on a fixed part, characterized in that said support (551) carries a shoulder (10, 161) for support of elastic means (20) urging an intermediate bushing (30) towards a coupling part (40) integral with the cable (504), in that said intermediate bushing (30) is mounted telescopically with respect to the coupling part (40) by means of disengageable locking means (50) between said parts and in that the intermediate socket area (30) is shaped to receive a second section (60) of a wheelhouse. 2) Device according to claim 1, characterized in that the locking means (50)   have gripping means (52).   3) Device according to claim 1 or 2, characterized in that the locking means (50) comprise a sleeve (51,151) coaxial with said socket   (30) and provided with a shoulder (52) for gripping.   4) Device according to any one of   preceding claims, characterized in that the   locking means (50) comprise balls (33) each mounted in a housing (32) having a frustoconical surface carried by the sleeve (30) and adapted to cooperate with a smooth part presented by the piece coupling (40).   ) Device according to any one of   Claims 1 to 3, characterized in that the means of   lock (50) comprise pawls (202) hingedly supported by the sleeve (30) and adapted to cooperate with a toothed portion (201) of the coupling piece (40). 6) Device according to claim 4 or 5, characterized in that the sleeve (51) that has the locking means forms a cage for said balls (33) or pawls.   7) Device according to any one of   preceding claims, characterized in that the   support (551) of said movable member (531) has, on the one hand, a shoulder (41) for supporting the coupling piece (40), and, on the other hand, a shoulder (631 ') for a piece (600) belonging to the movable member (531), and in that the length of the cable (504) is set according to the distance separating said shoulders (41,631 ').   8) Device according to any one of   preceding claims, characterized in that, in   storage position, unassembled wheelhouse, retractable holding means (70-160-161) are provided for   maintain said sleeve (30) in this position.   9) Device according to claim 8, characterized in that a retractable stop (70) is mounted on the intermediate sleeve (30) and is supported   on a shoulder (10) of the support (51).