FR2653194A1 - ADJUSTING ASSEMBLY FOR CLUTCH STOP, ESPECIALLY FOR A MOTOR VEHICLE, AND ACCOMMODATION PART OF SUCH AN ASSEMBLY. - Google Patents

Abstract

The present invention relates to a docking assembly (12), for traction action of a clutch release bearing (10) on the diaphragm (11) of a clutch, of the type comprising a docking part (16) carrying a ring (20), said part (16) comprising a sleeve (18) having two recesses (22A, 22B) distinct and separated by a bridge (32) for passage of strands (121A, 121B) of the ring (20). According to the invention, the part of the sleeve (18) which includes the recesses (22A, 22B) is deformed, at least in part, radially in the direction opposite to the axis of the assembly along a concave crown (132) towards the axis of the whole. Application to motor vehicles

Description

The present invention relates generally to the coupling of a

  disengagement stop at the diaphragm of the clutch when this stop of

  disengagement must act in traction on this diaphragm.

  It relates more particularly to the case where it is implemented for this purpose a docking assembly as described in the documents FR-A-2 634 935 and FR 88 05 135, and also relates to a part

docking such a set.

  More specifically, as disclosed in the above-mentioned document FR 88 05135 (FIGS. 1 and 2), this docking assembly comprises, on the one hand, a docking piece 16, here in stamped sheet metal, having a flange 17 specific to its bearing on the diaphragm 11, on the opposite side to the abutment 10, with here a bent transverse profile, and in one piece with this collar 17, a sleeve 18 intended to pass through the diaphragm 11 in favor of its central opening 15, between this diaphragm 11 and the driving part 13 of the clutch release bearing 10, and, on the other hand, extending annularly inside said bushing 18, between the latter and the part d 13, a coupling rod, which, elastically deformable radially, is adapted to a coupling of said abutment 10 by simply latching thereof, at least for the axial direction which, from the collar 17 to the rod 20, and as represented by the arrow F of FIG. 1, corresponds to the the exercise of

  pulling this stop 10 on the diaphragm 11.

  The rod 20 is opened by two strands 21A, 21B, which each through the sleeve 18 in favor of a recess 22A, 22B thereof and is carried by said sleeve. The recesses 22A, 22B are in practice circumferentially separated from one another by a bridge 32 and each extend over a distance greater than the diameter of the round wire constituting the coupling rod 20,

  both circumferentially and axially.

  The strands 21A, 21B are allowed to elastically hook one on the other, so that the rod 20 is closed on itself, these strands then bearing on the

bridge 32 (Figure 2).

  The part of the bushing 18, which has said recesses 22A, 22B, is deformed radially in the direction of the axis of the assembly, following a curved convex towards

this one.

  This provision is satisfactory and requires to realize this convex coming back to the press. In some cases it may be desirable to further improve the accuracy and the geometric quality of the internal bore of the bushing, in particular with regard to the generally frustoconical section 124, internally providing a frustoconical bearing, that presents the bushing in its zone

median for support of the ring.

  In general, a precise calibration of the internal bore of the bushing is made difficult by the presence of the re-entrant bridge, which prevents any operation.

subsequent recovery.

  The object of the present invention is to overcome these disadvantages and thus to improve, simply and economically, the geometric quality and the calibration of

  the internal bore of the bushing of the docking piece.

  According to the invention, a docking assembly of the above-mentioned kind is characterized in that the part of the sleeve of the docking piece, which comprises the passage recesses of the strands of the coupling rod, is deformed at least partly radially. opposite direction to the axis of the assembly, following a concave crown

towards the axis of the whole.

  Thanks to the invention the concave crown does not constitute an obstacle to a subsequent operation of recovery such as a turning operation, so that the internal bore of the sleeve can be obtained with a

  very good geometric quality and very good odds.

  In particular, the frustoconical bearing surface can be obtained with very good precision, particularly with regard to its location, and the same is true of the internal surfaces of the cylindrical parts, extending said frustoconical bearing surface on either side.

of it.

  Proper calibration of the internal bore of the

socket can be so realized.

  This geometric quality is favorable to

assembly of the docking assembly.

  Preferably it is the bridge which is deformed, partly radially, which then has a shape

curved.

  Thanks to this arrangement, the prepositioning of the coupling rod, before snapping of the stop, is favored. According to an important characteristic, the crown affects the end cylindrical part, forming the free end of the sleeve, as well as part of the

  frustoconical section of it and the bridge.

  According to a very important characteristic, the fingers of the diaphragm have a clearance opposite

passing recesses.

  With this arrangement, the mounting of the ring is favored. As will be understood the arrangement according to the invention was not obvious, because one could expect an obstacle when assembling the stop, the fact that the rod usually has a portion of orientation axial running outside the sleeve. Thanks to the clearance, the diaphragm can come closer to the socket, without the mounting of the stop is impeded, and the bulge allows the prepositioning of the ring, while having a support of the ring on the axial bottom of the recesses, au- beyond the connecting radius of curvature

  the running part of the ring at its axial portion.

  The mounting of the ring inside the sleeve being more precise, according to another feature there is provided a provision for improving the elasticity of the ring and therefore to reduce the effort of

clipping of the ring.

  For this, for example, the strands of the ring each incorporate at least one loop of the traction spring type.

  The attached description illustrates, as a

  for example, the invention with reference to the accompanying drawings in which: Figure 1 is an axial sectional view of a docking assembly, identical to Figure 1 of FR 88 05135 shown in place between the diaphragm of a clutch and the clutch release for acting thereon; FIG. 2 is a partial view in circumferential section identical to FIG. 3 of the document

FR 88 05135;

  - Figure 3 is an end view of the docking piece according to the invention; - Figure 4 is an axial sectional view of a docking piece according to the invention mounted on the diaphragm and equipped with its coupling rod; FIG. 5 is a partial view according to

arrow F1 in FIG.

  For simplicity, the same references will be assigned to the elements common to the present invention and

to those of the prior art.

  For the record, it will be recalled that the release stop 10 comprises, for its intervention, a driving piece 13, formed here by the extension of the inner ring of a ball bearing, presenting, transversely, at its outer periphery a shoulder

  14, forming driving range.

  This shoulder delimits a groove inside which is housed, after assembly by clipping of the stop, the ring 20 carried by the docking piece 16. Regarding the diaphragm 11 it will be noted that its central portion is formed of fingers radial 8 separated by slots (Figure 5) and that axially it

  has a central opening 15.

  In Figures 3 to 5 for maintaining the docking assembly 12, implemented for the action in traction of a clutch release bearing 10 on the diaphragm 11 of a clutch, the flange 17 of the part of 16, from place to place at its outer periphery, fingers 25 which project axially in the same direction as the bushing 18 of the docking piece pass through the diaphragm 11, in favor, each of them respectively with a slot separating the fingers 8 thereof and which, each circumferentially door cantilevered to the right of the support collar 17ó and generally parallel thereto, retaining fingers 40 adapted to ensure, in cooperation with this collar 17, the axial retention of the assembly on the diaphragm as described in FIG.

  aforementioned document FR-A-2 624 935.

  The radially resilient coupling rod 20 extends in a plane substantially perpendicular to the axis of the assembly and is made of round wire. It is open and has two strands 121A, 121B, each of which passes through the bushing 18 through two recesses 22A, 22B

  distinct from this one, due to a strand recess.

  According to the invention, the portion of the bushing 18, which comprises the passage recesses 22A, 22B of the strands 121A, 121B, is deformed radially at least in part, in the direction opposite to the axis of the assembly, according to a

  concave curved 132 towards the axis of the assembly.

  Although it is possible to deform all of the recesses 22A, 22B, in FIGS. 3 to 5 it is the bridge 32 which is locally deformed radially in the direction opposite to the axis of the assembly, said bridge having in part a curved shape, as best seen in

Figures 3 and 5.

  More precisely, the sleeve 18 comprises, in addition to the frustoconical section 124, two cylindrical parts

  , 131 extending on either side of said section 124.

  The portion 130 has a larger diameter and is connected by an elbow to the collar 17, while the portion 131 forms the free end of the sleeve 18,

  being chamfered and smaller in diameter.

  As best seen in Figure 4, the local bulge 132 partially affects the bridge 32, as well as the entire

  of the portion 131 in the axial alignment of the bridge 32.

  The rod 20 comprises at least one lug 23 which, radially extending, is itself engaged with a

  recess 24 of the sleeve 18 wider axially.

  Here two radial tabs 23, in the form of half-wave deformation, and two recesses 24 are provided, each generally 120 relative to the recesses 22A, 22B; said tabs 23 only being in contact with one of the lateral edges of the recesses 24, to promote the expansion of the rod 20 during

latching the stopper 10.

  To improve the elasticity of the open ring, the two strands 121A, 121B are each provided with a loop 122A, 122B. After mounting the loops extend

above the stop.

  Said loops reduce the rigidity of the ring, which facilitates assembly by

clipping, as well as gripping.

  Outside the bushing 18, the strands 121A, 121B have, below the loops 122A, 122B, two elbows, which result that, offset axially with respect to the rod 20, their ends extend jointly in a plane parallel to said rod between the

stop 10 and the diaphragm 11.

  The end of the strand 121B obliquely forms a hook 30 specific to its elastic hooking on the

  current portion of strand 121A beyond the loops.

  More specifically (FIGS. 4 and 5), each of the strands 121A, 121B after passing through the recesses 22A, 22B, has an axial orientation portion 125 in contact, before mounting the abutment, of the outer surface of the sleeve 18, and more precisely of the portion 131, said portion 125 extending by a first radial portion 126, then by a second inclined radial portion 127 in the plane of Figure 4 and including the

loop 122A, 122B.

  The portions 126 are closer than the portions 127, which favor the tilting of the diaphragm 11. An S-shaped fold 128 connects said portions 126, 127, which are parallel to one another from a strand 121A to

the other strand 121B.

  The portion 127 comprises two radial portions axially offset and parallel to each other, said portions being connected by an inclined portion 129 of a

loop 122A, 122B.

  This portion 129 generally forms a coil of a helical spring and said loops constitute a

  spring-type spring "clothespin".

  According to an important characteristic of the invention, the diaphragm has a clearance 200 in

view of the recesses 22A, 22B.

  For reasons of symmetry, two others

  clearances 200 are provided at the legs 23.

  As best seen in FIG. 5, for constitution of said clearance 200, the two fingers 8 concerned of the diaphragm are trimmed at their periphery.

  internal and thus have a larger diameter.

  Thanks to this arrangement the assembly of the rod 20 is made easily possible, despite the presence of the bulge 132, according to the invention, serving advantageously to

  preposition the portion 125 before mounting the stop.

  Indeed, the internal diameter of the portion 125 may be equal to the outer diameter of the portion 130, of larger diameter by an appropriate choice of the

dimension of the bulge 132.

  Thanks to this it is certain that during the mounting of the abutment 10, the rod 20 bearing against the axial bottom of the recesses 22A, 22B (Figures 2 and 4), that the support on said bottom 50 is outside the radius of curvature of the rod 20 connecting the portion 125 to the current portion thereof. The clearance 200 then allows the passage of the portion 125, the expansion of the ring 20 is satisfactorily done by pressing on said bottom 50, the bulge according to

  the invention allowing the prepositioning of the ring.

  For the record, it will be pointed out that the free configuration of the ring 20 strands 121A, 121B deviates one from

  the other, while the diameter of the ring increases.

  After mounting the abutment 10 by snapping on the rod 20 and hooking strands 121A, 121B, said strands are allowed to wear circumferentially on the

bridge 32.

  For disassembly it is sufficient to unhook the strands 121A, 121B of the rod 20, the latter then passing from its position of constraint (closed position) to its free position. For more details, please refer to

aforesaid document 88 05135.

  As is evident from the

  description and drawings, although socket 18 is

  performed with the press, the internal bore of said sleeve 18 can be obtained with a good geometric precision, its internal median frustoconical reach of the section 124 can be easily obtained by turning with a very good accuracy and very good odds, as well as with a very good location. The same geometric precision can be obtained in the same way with regard to the surfaces

  internal parts cylindrical 130,131.

  In all cases the bridge 32 protruding towards

  the outside of the socket is not an obstacle.

  It will be noted that in operation the rod is supported on the one hand on this scope 124, and on the other hand,

against the shoulder 14.

  Naturally, the present invention is not limited to the embodiments described, in particular the coupling of the clutch release stop to the diaphragm can be achieved using a washer

  Belleville 26, as shown in Figure 1.

  The rod 20 may be provided with only one lug 23 extending partly axially as described in the document FR-A-2624935 Alternatively several loops 122A, 122B may

  be provided for each strand 121A, 121B.

  The strands may be identical to the strands 21A, 21B of the document FR 88 05135 and in this case the additional elasticity of the rod 20 may be obtained

by slimming down his legs 23.

  Finally instead of loops, one can provide an elongation of the strands, for example, by forming a

  zigzag, to improve the elasticity of the strands.

Claims (7)

  1) A docking assembly of the kind comprising, for the traction action of a clutch release stop (10) on the diaphragm (11) of a clutch, on the one hand, a docking piece (16) comprising a flange (17), adapted to bear on a diaphragm (11), and in one piece with said flange (17), a sleeve (18) for passing through said diaphragm (11) in favor of the central opening (15) thereof, and, on the other hand, extending annularly within said bushing (18), a coupling rod (20), which, elastically deformable radially, is suitable for a hitch the clutch abutment (10) by simply snapping it, at least for the axial direction from the flange (17) to said rod (20), said sleeve (18) having two recesses (22A, 22B) distinct, for each passage of a strand (121A, 121B) of a coupling rod (20), separated from each other by a bridge (32), characterized in that the part of the sleeve (18) which has the s recesses (22A, 22B) passage of the strands (121A, 121B) of said rod (20) is deformed, at least in part, radially in the direction opposite to the axis of the assembly following a concave convex (132) to the axis of all.   2) docking assembly according to claim 1, characterized in that the bridge (32) is deformed, at least   in part, radially and has a curved shape.   3) docking assembly according to claim 2, wherein the docking piece (16) has a frustoconical section (124) and two cylindrical portions (130, 131) disposed on either side of said frustoconical section (124), one (131) of said parts, said terminal, being of smaller diameter than the other and forming the free end of the sleeve (18), characterized in that said end portion (131) is also deformed at the same time as the bridge (32).   4) docking assembly according to claim 3, characterized in that the diaphragm (11) has a recess (200) facing the recesses (22A, 22B). ) Docking assembly according to any one   Claims 1 to 4, wherein the coupling rod   (20) has an axial portion (125) at the outer periphery of the sleeve (18), characterized in that said bulge (132) of the sleeve (18) is a means of   prepositioning for said axial portion (125).   6) Docking assembly according to any one   Claims 1 to 5, characterized in that the strands   (121A, 121B) each incorporate a loop (122A, 122B).   7) Docking assembly according to any one   Claims 1 to 6, wherein the rod (20)   has at least one lug (23) extending radially and penetrating into a recess (24) provided by the bushing (18) for this purpose, characterized in that said leg (23) is thinned.   8) Berthing piece for docking set   according to any one of claims 1 to 7,   characterized in that it comprises two recesses (22A, 22B) separated by a partially deformed bridge (32)   radially in the direction opposite to the axis of the assembly.