DE3243678A1 - Device for disengaging a clutch, particularly in motor vehicles, with improved installation characteristics - Google Patents

Abstract

The invention relates, in particular, to a device for disengaging a clutch, in particular in motor vehicles, with improved installation characteristics. A shaft of a fork (26) is accommodated in a housing (17) in a manner which allows both longitudinal movements and rotation. A sleeve (24) has a cylindrical positioning bearing (34) which is arranged next to a collar flange (33) and the diameter of which corresponds to the spacing of the fork branches (27). This cylindrical support (34) is extended into a tapered centring supporting surface (35). It is thus possible for the arrangement to be installed blind if the housing (17) is completely closed. The area of use is in clutches in particular for motor vehicles, e.g. for agricultural tractors. <IMAGE>

Description

Patent Attorneys Oc. Fincke ■ Bahr ■ Staeger · Mullersir. 31 SOOO Munich 5

64 avenue de la Grande Army

75017 Paris

"Device for disengaging a clutch , especially in motor vehicles, with improved installation properties"

The invention relates to a clutch release device, in particular for motor vehicles, which with Means for uncoupling is equipped. The device acts, for example, in particular by pulling on a part, as Designated thrust bearing, which is adapted to be attached to the means for uncoupling and which of one on a guide which is coaxial with the longitudinal axis of the coupling and fastened to a fixed housing Sleeve is worn. The device also has a two-legged fork which is attached to one on the housing arranged cross shaft is attached, with the ends of the legs of the Gabc? l against a collar flange of the sleeve Press to disengage the clutch.

For the assembly one approaches on the one hand from the gearbox with its housing carrying the above mentioned guide and with its first shaft, which forms the driven shaft of the coupling, existing block and on the other hand one from the motor and the clutch with its friction disk and the shaft referred to above to each other. The friction disc is placed on the input shaft of the gearbox

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and in the same way the sleeve on the guide, up to the required longitudinal position. For this it is necessary that the fork does not form an obstacle, since in the end position of the assembly the collar flange of the sleeve assumes a position that is on the other side of the fork in order to take it up against the side, which corresponds to a pulling disengagement movement. Various arrangements have been proposed to date to get the fork out of the way to make this one Insertion of the sleeve on the guide does not hinder, but these arrangements require besides a complicated construction generally manual intervention through an opening formed in the housing. However, in numerous areas of application, Especially in vehicles such as agricultural tractors, the housing is completely closed and such manual intervention is not possible.

The present invention is based on the object of creating a device of the type mentioned, in particular for motor vehicles that is free from the various above listed disadvantages, and a blind assembly of the sleeve on the guide with simultaneous correct insertion of the fork allowed.

According to the invention, the object is achieved with a release device a coupling of the type mentioned, in particular for motor vehicles solved in that the shaft of the fork in both Movable in the longitudinal direction as well as rotatably mounted in the housing, while the sleeve has a cylindrical positioning support surface has, which is provided next to the collar flange, and whose diameter corresponds to the distance between the fork legs, and that a concentric centering surface adjoins the support surface.

Thanks to this arrangement, it is sufficient to actuate the shaft of the fork from outside the housing, said first fork at the time of assembly is turned back. -

and thus enables the sleeve to reach its end position

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slide along the guide, after which the fork is rotated in the opposite direction to bring it into the actuation position to bring, which happens automatically, even if the fork is not exactly opposite the sleeve. this is made possible by the extent of the longitudinal displacement of the Fork shaft. If the fork is not exactly centered with respect to the sleeve, it will first meet the conical centering area that allows you to bring yourself exactly in a position in which it includes the cylindrical bearing surface of the sleeve. if If the fork is placed astride the cylindrical support in this way, its position is exactly defined and it is thus in the correct actuation position »

If the assembly is effected in this way, one connects the fork shaft with a clutch linkage that leads to the clutch pedal.

More precisely, the fork shaft is rotatably inserted in the housing for the purpose of mounting the operation, and indeed not only over a first angular range, which corresponds to the disengagement travel of the clutch, but over a second angular range, which precedes the first, around the legs allowing the fork to fold out of the way to thereby to clear a passage for the collar flange of the socket.

It can happen that the socket tends to be damaged by the Clutch, always in the same sense of being displaced rotation. This rotation is undesirable for a number of reasons, including noise. Advantageously Means are provided to hold the sleeve in an angle-locked manner.

According to a further feature of the invention, these means have Projections, which are each arranged and designed on the collar flange of the sleeve and on the fork, in the transverse direction to come to the system against each other ο *

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Thus, when the sleeve tends to be rotated by the coupling, it is rotated, but only until the projections come to rest against one another, since from that point on the socket is subject to a further rotation is prevented.

In any case, the projections of the collar flange of the sleeve and the fork can interfere with the assembly if they accidentally collide at the moment of this assembly, which can happen during the insertion of the sleeve on the guide or after such an insertion, which took place without hindrance, while turning the fork out of its folded-down position Position in their actuation position.

According to a further feature of the invention, the projections are equipped with slide ramps that make it possible in the Case of a coincidental encounter during assembly twist the sleeve slightly to bring the protrusions side by side.

The ramp means of the projections are oriented so that they interact with one another, be it during the insertion of the sleeve on the guide, be it during the turning up of the fork, be it in such a way that they indiscriminately in the one or the other of these two possibilities.

It should be noted that the space requirement is significantly reduced. This reduction in space requirements can be further increased due to flats formed on the hub of the fork are.

According to a further characteristic, one of the two projections has, with respect to the other, a circumferential length which is sufficient is large, so that the pressing of the two projections against each other is ensured during the entire disengagement process, and this advantageously, how great the wear on the clutch, especially the friction disc, may be.

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The following is an example of an embodiment of the invention explained in more detail with reference to the drawings. Show it

Figure 1 is a general schematic view of a longitudinal section a clutch with a release device according to the invention, shown in engaged State,

Fig. 2 is a view similar to that in Fig. Λ, but in the disengaged state,

3 is a view analogous to FIG. 1, but the coupling and the fork are shown in a position before the sleeve is inserted on the guide _?

Fig '4 is a view of the sleeve and the fork in the cross section along the dashed line IV-IV in Figure "1"

Fig. 5 is a perspective view of the sleeve ,

FIG. 6 is a partial view in an enlarged representation of FIG Sleeve and fork in which the projections of these parts are shown lying against one another during assembly are and

Fig. 7

and 8 corresponding views of the lines VII-VII and VIII-VIII in Fig. 6 "

In the embodiment shown in Figures 1 to 8; which as a non-limiting the invention Embodiment of use of the invention in a motor vehicle such as an agricultural one The tractor shows, the clutch (Fig. 1) has a counter-pressure plate 10, which is supported by a flywheel of the vehicle engine is formed with a ring gear 11.

The clutch also has one attached to the flywheel, for example by means of screws (not shown) Lid 12 and a rotatably connected to the arrangement 10, 12 Pressure plate 13, which is axially displaceable with respect to this arrangement, this for example by means of tangential, between the thrust washer 13 and the cover 12 provided connecting leaf springs (not shown) happens.

Between the plates 10 and 13, a friction disk 14 is provided and with the interposition of keyways 15 on one placed driven shaft 16, which is formed by the input shaft of the vehicle transmission, the fixed housing with the reference number 17 is identified. The shaft 16 is centered in the flywheel 10 by means of a bearing R.

The plates 10 and 13, the disc 14 and the shaft 16 are arranged coaxially to the longitudinal axis A of the coupling.

The pressure plate 13 is pressed against the disc 14, which is in turn pressed against the plate 10 by means of a plate spring 18. The plate spring is supported at 19 on the cover 12 and at 20 on the pressure plate 13.

This plate spring 18 has fingers which are radially spaced apart and which extend towards the axis A and a decoupling means form.

For disengagement, a pulling force is applied to the ends of the radial fingers 31 to the right in Figure 1, i.e. from the Flywheel 10 continues, which makes it possible to terminate the resilient clamping effect of the plate spring 18 on the pressure plate 13 and as a result of this, to unclamp the disc 14.

For this reason, a clutch release device is provided which pulls on a part 22, a thrust bearing. The thrust bearing 22 is designed at 22A-23-23A at the end

coupling means 21 to be set. It is supported by a sleeve 24 with the interposition of the outer ring 22B, which can be moved along a fixed guide 25 * This guide 25 runs coaxially to the longitudinal axis of the coupling and is fixed to the fixed housing 17.

This clutch release device also has a fork 26 with two legs 27, the ends of which are identified by 28 are. The fork 26 comprises a hub 29 which is fixedly seated on a shaft 3O, the axis B of which is transverse with respect to the axis A The shaft 30 (Fig. 4) is on the housing 17 in with holes provided projections 31 used. It is connected to a lever 3OB via a pin 3OA, which is attached to the outside of the Housing 17 is provided and has an opening 3OC} um to be able to be connected in a detachable manner to a clutch lever (not shown) of the tractor. The lever 3OB has a clearance J to the housing 17 in order to reduce the eventueP * = len longitudinal displacements of the shaft 30 not to hinder its Usefulness emerges from the further description.

The ends 28 of the legs 27 of the fork 26 (Fig. 1 to 4) act at 32 in an abutting manner against a collar flange 33 of the Sleeve 24 to disengage the clutch.

In Fig. 1 it can be seen that in the assembly position, the legs 27 of the fork 26 are located to the left of the collar flange 33 of the sleeve 24, in such a way that when the ends 28 this leg 27 to the right (Fig. 1), the sleeve moves to the right (from the position in Fig. Ί in that of Fig. 2) in such a way that a train on the decoupling center1 21 is exercised and the clutch is disengaged.

But this necessary position of the legs 27 of the fork 26 in relation to the collar flange 33 requires during assembly the sleeve 24 on the guide 25 precautionary measures "because the The collar flange 33 has to be moved from the left to the right by the fork 26 without the legs 27 becoming an obstacle; form. * · ■ · »'/.:. · ,;

According to the invention, the shaft 30 of the fork is inserted at 31 in the housing 17 so as to be both movable and rotatable in the longitudinal direction.

In particular, this shaft 30 of the fork is not only rotatable in a first angular range S1 on the housing 17 (FIGS. 2 and 3), which angular range corresponds to the release travel of the clutch, but in the same way in a second angular range S2, which precedes the former because of the need to insert the sleeve 24 on the guide 25, thereby making the Legs 27 of the fork 26 is allowed to release a free transfer passage ■ for the collar flange of the sleeve 24.

Furthermore, the sleeve 24 (Figs. 1 and 4) according to the invention a cylindrical positioning support surface 34, which located next to the collar flange 33 and whose diameter D corresponds to the distance E of the legs 27 of the fork 26. This cylindrical Support surface goes into a conical centering support surface 35 over.

Such an arrangement allows a blind assembly of the clutch on the housing 17 of the transmission, even if the housing 17 is without any opening that would allow manual action.

For assembly, you first release the lever 30C of the clutch linkage at 30c, which controls the actuation movement of the clutch pedal transmits to shaft 30. In this way, the shaft 30 is free and can be freely rotated and displaced as described above will.

The shaft 3o is rotated from outside the housing 17 in such a way that the legs 27 of the fork 26 are folded back into the reclined position, as shown in Fig. 3, in which the fork is on the bottom 17A of the housing 17.

The sleeve 2 4 is moved to the right in Figure 3. The socket thanks to a bevel 24A can easily be attached to the end 25A of the

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9 - » a

Slide on guide 25 and then on this guide slide along.

This movement is carried out without the collar flange 33 of the Sleeve 24 is in danger of being affected by the fork 26, since this has kicked back on the floor 17A.

The sleeve 24 is then brought into the assembly position, in which the collar flange 33 has exceeded the fork 26 and is located on the right side thereof. During this assembly the friction disc 14 is on the splines 15 on the Shaft 16 pushed on, which at the same time in a centering Engagement in the bearing R of the flywheel 10 device.

When the sleeve 24 is in its intended position on the guide 25, the shaft 30 is rotated clockwise, As shown in Figures 1 to 3, the legs 27 of the fork 26 at 32 in contact with the collar flange 33 of the Bring sleeve 24 (Fig. 1).

In the course of this actuation it is possible that the legs of the fork 26 are initially not exactly in relation to the sleeve 24 are centered or are in the vicinity of such a centering.

When the legs 27 of the fork 26 are folded up in order to slip past the sleeve 24 on this side, they hit the conical centering surface 35 and are, if necessary, laterally displaced in a manner in which they one perfectly Assume the correct position in which they are correctly seated on the cylindrical support 34 of the sleeve 24 «

In this way, the fork 26 is correctly aligned with respect to the sleeve 24.

From now on it is no longer necessary that the shaft 30 γ is freely movable and it is sufficient that it can be rotated,

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so that it can ensure the path to disengaging the clutch (from the position in FIG. 1 to that of FIG. 2). One can thus reconnect the lever 3OB at 3OC to the clutch linkage and thus to the clutch pedal. The assembly is finished.

It goes without saying that the expansion conditions are just as advantageous as those of the assembly, since the procedure is reversed is sufficient to release the lever 3OB at 3OC from the coupling linkage, the legs 27 of the fork 26 from the vertical Position (Fig. 1 or 2) to fold down into a horizontal position until it hits the floor 17A to then pulling the assembly of the clutch away from the clutch housing.

The sleeve 24 may have a tendency to be driven by the plate spring 18 which rotates simultaneously with the entire assembly 10, 12 and 13. Such a rotation of the sleeve 24 is undesirable because it causes noise, wear and, in the case of a self-centering thrust bearing, a disturbance of the self-centering, and it is advisable to prevent this.

Means are provided to the sleeve 24 with respect to the To fix the leg position, (Fig. 4 to 8), which two projections 40 and 41, which are provided on the collar flange 33 of the sleeve 24 and the hub 29 of the fork 26, respectively. These Projections 40 and 41 are designed to be pressed against each other in the transverse direction at 42 (Fig. 4).

At least one of the two projections 40 and 41, for example the projection 41 in FIG the disengagement S1, and this is also the degree of wear of the clutch and in particular of the friction disc 14 may be as large as well.

As can be seen in particular from FIG. 3, the

Projections 40 and 41 be a hindrance during assembly, if the fork 27 is knocked back onto the bottom 17A of the housing 17 is. The protrusion 41 occupies a level which is above the lowest level that the protrusion 40 can occupy, which is the case in FIG.

In these conditions, the projections 40 and 41 can during the insertion of the sleeve 24 on the guide 25 randomly come to rest against each other.

There are means for easily rotating the sleeve 24 and bringing it closer of the projections 40 and 41 provided side by side / if such a coincidence should come to light. These funds exist of ramp means located at 43 and 44 on protrusion 40 and are worked out at 45 on the projection 41 »

The ramp 43 consists of beveled flanks of the projection 40, while the ramp 44 consists of a front spur of this projection. The ramps 45 consist of beveled flanks of the Protrusion 41.

In the event of an accidental collision between the projections 40 and 41 during the insertion of the sleeve 24 on the guide 25 the front spur 44 and then the flanks 43 of the projection 40 slides on the flanks 45 of the projection 41, which the sleeve 24 rotates and brings the projections 40 and 41 each in the correct position one next to the other.

While the fork 27 is folded down on the floor 17, the Projection 41 are brought into a plane which is below the lowest level that the projection 40 can occupy, which may be the case in Fig. 3 if the bottom 17A is lower Would cherish.

In such a case, the projections 40 run, 41 certainly not risk _f that insertion of the sleeve 24 hinder zn to the guide, however, they may accidentally during the

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Turning back the fork against each other come to the plant and thus hinder this turning back. Means are provided / to turn the sleeve 24 slightly and around the projections 40, to bring side by side when such an unfortunate encounter should come about. These means consist of ramp means at 46 on the projection 40 and at are arranged on the projection 41. The ramp 46 consists of a rear spur of the projection 40, while the ramps 47 consist of a front spur of the projection 41.

In the event of an accidental collision of the projections 40 and 41 during the unscrewing of the fork 27 after an unobstructed Inserting the sleeve 24 on the guide 25, the front spur 47 of the projection 41 slides on the rear spur 46 of the projection 40, whereby the sleeve 24 is rotated and the projections 40 and 41 aligned in the correct position next to one another will.

It is to be noted that when the projections 40 and 41 during the insertion of the sleeve 24 on the guide 25 against each other slide, are no longer in danger of colliding with one another while the fork 27 is being unscrewed.

It is therefore sufficient to only place part of the ramps on the projections be provided, be it 43, 44, 45 in the case of a high floor 17A, or 46, 47 in the case of a low floor 17A.

But you can advantageously use the ramp arrangement 4 3 to provide, as is otherwise shown in Figures 5 to 7 and in such a way that the arrangement according to the invention always works satisfactorily, whatever the level of the Bottom 17A may be.

The projection 40 can instead of the illustrated pyramid shape also have a conical shape.

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Claims (6)

smells 1 »y disengaging device of a coupling equipped with means for decoupling, which acts on a part, referred to as a thrust bearing, which is attached to the means for decoupling and which is from a housing coaxial to the longitudinal axis (A) of the coupling and on a fixed housing fixed guide slidably arranged sleeve is supported, and with. a two-leg fork which is arranged on a transverse shaft (B) mounted in said housing, the ends of the legs resting against a collar flange of the sleeve for the purpose of disengaging the coupling, characterized in that the shaft (30) of the Fork (26) is supported both longitudinally and rotatably in the housing (17), while the sleeve (24) has a cylindrical positioning support surface (34) which is provided next to the collar flange (33) and whose diameter (G) corresponds to the distance (E) of the fork legs (27), and that a concentric centering surface (35) adjoins the support surface (34). BATH ORIGINAL 2. Device according to claim 1, characterized in that that the shaft (30) of the fork is not only in a first angular range (S1), which corresponds to the disengagement path of the clutch, is rotatable in the housing, but also over a second angular range (S2), which is used for mounting the sleeve (24) on the Guide (25) is required and precedes the former, allowing the legs (27) of the fork (26) to tilt back and thus to clear a passage for the collar flange (33) of the sleeve (24). 3. Device according to claim 1 or 2, characterized in that that means for maintaining the socket in a fixed angular position comprise two projections (40, 41), which are each worked out on the collar flange (33) of the sleeve (24) or on the fork (26) and designed so that they come to rest against each other in the transverse direction. 4. Apparatus according to claim 3, characterized in that that the two projections (40) ramp means (43, 44, 45, 46, 47) for bringing the two projections closer side by side by means of a small rotation of the sleeve (24) when at the moment of assembly of the sleeve (24) on the Guide (25) push the two projections against each other. 5. Apparatus according to claim 3 or 4, characterized g ekennze ichnet that at least one of the two Projections (40, 41) has a length in the circumferential direction (L) with respect to the other projection which is sufficiently large, so that the two projections are pressed against one another during the entire disengagement path. 6. The device according to at least one of claims 3 to 5, characterized in that at least one of the two projections (40, 41) a length in the circumferential direction (L) with respect to the other projection which is large enough to allow the two projections to be pressed against one another is ensured during the entire disengagement process, whatever the degree of wear on the clutch may be. BATH ORIGINAL