FR2744504A1 - CLUTCH OPERATING DEVICE FOR A MOTOR VEHICLE GEARBOX - Google Patents

Abstract

In said device, a jack, imparting axial slides to a clutch bearing (1) surrounding a shaft (2), comprises at least three sub-parts (3) surrounding said shaft (2) with regular spacings in the peripheral direction. Guide means are installed in the spaces between the sub-parts (3), formed by the peripheral spaces.

Description

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D E S C R I P T I O N

DESCRIPTION

  CLUTCH OPERATING DEVICE FOR A GEARBOX

MOTOR VEHICLE SPEEDS

  The present invention relates to a device for

  clutch actuation for a gearbox, including a declutching bearing which encircles a shaft and can be animated by axial sliding by means of a fixed mounting jack, capable of being acted upon by a circulating fluid, means of guide being provided to suppress deflection movements of the declutching bearing, directed in the radial direction. An actuation device of this kind is known

  according to patent TI-A-4,001,607. The jack is then configured

  annular ration and is assigned, on the surface of the tree, in the direct vicinity of the latter. The embodiment is therefore complicated. In addition, it conditions a large bulk in the axial direction insofar as the bearing of

  release, the cylinder and the guide means are provided in suc-

  mutual transfer in the axial direction.

  The subject of the invention is an actuation device

  clutch of the aforementioned type, improved so as to produce

  guer, through a simplified manufacturing possibility, a

  reduced overall dimensions in the axial direction.

  In the clutch actuating device according to the invention, this object is achieved by the fact that the jack comprises at least three sub-parts surrounding the shaft at regular intervals in the peripheral direction; and by the fact that the guide means are installed in the intermediate spaces of the sub-parts, to which the peripheral spaces give rise. In this way, the cylinders integrated in the sub-parts no longer necessarily have to be of annular configuration, which considerably simplifies

  their manufacture. They are located at a radial distance from the ar-

  bre, which makes it possible to provide the guide means and / or the declutching bearing in an area which is at least partially

  overlapped, in the axial direction, by the sub-parts. He re-

  results in a significant reduction in the space required in the

axial direction.

  The sub-parts are grouped in a casing, are mounted fixed and can, consequently, in a simple manner, be stressed by a pressurized fluid in circulation, by

  for example by a hydraulic fluid or by a gas.

  The guide means can be formed by pre-

  better appendages of a structural part encompassing the

  parts, which appendages protrude parallel to the longitudinal direction of the shaft, and surround the bearing

  declutching in the region of an outer delimiting surface

  tion. The clutch release bearing generally consists of a

  ball grooved. Its purpose is to reflect, on the clutch, the actuation forces developed by the sub-parts and directed axially. Its assignment to a zone

  overlapping, in the axial direction, with the first appendices

  these, implies an economy in the axial length of reali-

station.

  The outer delimiting surface can also form an integral part of a support ring providing accommodation

  clutch release bearing. The saving in space which

  sulte corresponds to the economy mentioned above. In addition, the additional advantage is obtained that the declutching bearing can correspond to any standardized embodiment. This is a great advantage

  concerning the acquisition of spare parts.

  The springs or, respectively, the elements of

  snap-on mounting, which are distributed around the

  only in a clutch, do not normally have a completely matching flexibility. This results in a couple of

  tilting acting, in rotation, on the clutch release bearing.

  To prevent that, following this tilting torque, increased frictional forces hamper the axial sliding of the declutching bearing during actuation of the clutch, or even that there occurs an autoblocking, it has proved advantageous that the delimitation surface is at least curved

  in the partial regions with which the first appen-

  dices come in contact. The integrated declutching bearing is thus able to adapt to the flexibility of the springs, which is different in the peripheral direction, and to follow the ends of the springs, yielding flexibly, so as to obtain, in all the zones of the periphery. , a stress of the clutch release bearing balanced in the peripheral direction. This represents a great advantage in obtaining improved durability of said bearing.

  The nutation movement of the clutch release bearing results

  so much of this tilting torque acting in rotation, is related to

  permanent alternation of fluid between the individual cylinders

  vuel, so that the cross sections of connection of a small dimension, between said cylinders, give a strong

  damping of this nutation movement.

  Second support may be provided on the support ring.

  pendants which extend radially outward and engage with the subparts. The diameter of the clutch release bearing can be reduced correspondingly, which reduces the

production costs.

  An even greater reduction in the production length is obtained when the second appendages are

  provided at the end of the support ring which is turned to the op-

  placed sub-parts, and when the support ring is capped, up to the second appendages, by actuation means

integrated into the subparts.

  The invention will now be described in more detail, by way of nonlimiting example, with reference to the appended drawings in which:

  FIG. 1 illustrates, in longitudinal section, an em-

  clutch in which an example of an acceleration device is integrated

tction; and

  Figure 2 is a front view of the delivery device.

Figure 1.

  The clutch actuation device shown is intended for a gearbox which is an integral part of the drive branch of a motor vehicle. The actuating device includes a declutching bearing 1 which surrounds a shaft 2 and can be driven by axial sliding by means of a fixed-mounting jack, which can be acted upon by

  a fluid in circulation and comprising three sub-parts 3 in

  turning the shaft 2 at regular intervals in the peripheral direction; guide means are then provided in the intermediate spaces of the sub-parts 3, which give rise to the peripheral spaces. Guiding means

  are formed by the first appendages 6 of a structured piece

  including sub-parts 3, which appendages project parallel to the longitudinal direction of the shaft

  2, and surround the bearing 1 in the region of an outer surface

  delimitation border 5. The latter is an integral part

  of a support ring 7 providing a housing for the bearing 1. The surface

  this 5 is a curved embodiment in the region with which the first appendages 6 come into contact. When a movement

  is printed on the clutch, the support ring 7, including

  taken the bearing 1 therein, is thus able to respond, by a nutation movement, to the flexibility of release elements 10 of the clutch, said flexibility being different in the peripheral direction. In this way, also under unfavorable preconditions, a constraint

  fully balanced in the peripheral direction, imposed on the

  link 1, is guaranteed in the axial direction. So,

  by comparison with known embodiments, the di-

  meter of the clutch release bearing can be significantly reduced.

  Second appendices 8, provided on the support ring 7, extend radially outwards and are in engagement with the sub-parts 3. The fact that the second appendages 8 are provided at the end of the ring 7 which is turned away from the sub-parts 3, and that said ring 7 is capped, up to the second appendages, by actuation means 9 integrated in said sub-parts 3, results in a further reduction in the required production length in the axial direction. In the illustrated embodiment, the actuating means 9 of the sub-parts 3 are materialized by pistons. The latter are mounted on pressure springs in the associated cylinders. This results in an automatic compensation for the wear in service of the clutch disc,

  without the need for post-adjustment of the clutch.

  It goes without saying that many modifications can be made to the device described and shown, without going out

of the scope of the invention.

Claims (6)

-R E V E N D I C A T I ONS-   1. Clutch actuation device for a gearbox, including a declutching bearing (1) which surrounds a shaft (2) and can be driven by axial sliding by   via a fixed mounting cylinder, which can be loaded   cited by a circulating fluid, guide means being provided to suppress deflection movements of the bearing   declutching (1), directed in the radial direction, characteristic device   laughed at by the fact that the actuator comprises at least three sub-par-   ties (3) surrounding the tree (2) at regular intervals   in the peripheral direction; and by the fact that the means of guiding   dage are installed in the intermediate spaces of the   parts (3), which give rise to the peri-   spherical. 2. Device according to claim 1, characterized in that the guide means are formed by first   appendages (6) of a structural part including the   parts (3), which appendages project parallel to   the longitudinal direction of the shaft (2), and surround the pa-   release clutch (1) in the region of an outer surface of delimitation (5).   3. Device according to claim 2, characterized by   the fact that the delimitation surface (5) is an integral part   te of a support ring (7) providing housing at the bearing release (1).   4. Device according to any one of the claims   1 to 3, characterized by the fact that the delimiting surface (5) is of convex construction at least in the region with which   the first appendages (6) come into contact.   5. Device according to any one of the claims   1 to 4, characterized in that second appendages (8), provided on the support ring (7), extend radially towards   outside and are in engagement with the sub-parts (3).   6. Device according to claim 5, characterized in that the second appendages (8) are provided at the end   of the support ring (7) which is turned away from the sub-par-   ties (3); and by the fact that the support ring (7) is capped,   to the second appendages (8), by means of action   ment (9) integrated in the sub-parts (3).