FR2486604A1 - SLIDING SLEEVE OF RELEASE DEVICE - Google Patents

Abstract

THE SLIDING SLEEVE ACCORDING TO THE INVENTION IS MADE OF SHEET SHEET AND RECEIVES A SMOOTH PLASTIC COATING ON ITS INNER SURFACE 15, ON SURFACE 16 OF PUSH RING 5 FACING RELEASE STOP 1 AND ON SURFACE 17 SUPPORT OF THE CLUTCH LEVER. THIS COATING IS PREFERABLY MADE FROM A SELF-LUBRICATING MATERIAL.

Description

Sliding sleeve for a declutching device

  The present invention relates to a sliding sleeve

  health, made of sheet steel or similar, for a dis-

  positive disengagement, in particular a motor vehicle clutch, provided with a thrust collar and with a device intended to receive the clutch lever, and on or in which a disengagement clutch is disposed,

radially movable.

  Sliding sleeves of this kind are already

  known, in different embodiments.

  In the current state of the art, there are

  for example sliding sleeves made of metal.

  However, these sleeves must be lubricated during use. It is also not new to realize

  sliding metal sleeves, including the. external surface

  rieure receives a plastic coating. However

  these sliding sleeves do not provide good

  damping of noise and vibrations because, in function

  the clutch release bearing and the clutch lever

  are in contact with metal parts.

  Nor is it new to perform

  sliding sleeves, entirely made of plastic.

  But these known arrangements are not suitable for

heavy loads.

  The object of the invention is therefore to improve

  sliding sleeves known so as to give them

  rer good damping characteristics and

  dry running, as well as allowing them to sup-

carry heavier loads.

  According to the invention, this result is obtained thanks

  a sliding sleeve, at least the inner surface of which

  eue, la. front surface of the push flange

  facing the. clutch release bearing and contact surfaces

  then the clutch lever are provided with a coating

  smooth with good functional properties

  dry. In the case where the sliding sleeve has

  a cage of which the above-mentioned surfaces form part

  born to receive the clutch stop and the clutch lever

  clutch, the entire surface receives a smooth coating.

  This smooth coating can be made of plastic, for example polyamide 11 or polytetrafluoroethylene, or a self-lubricating material with a plastic binder. This arrangement of a smooth coating on a

  metal sleeve allows for a sliding sleeve

  solid, low friction, allowing trans-

  train existing realizations without com-

  additional and without new tools.

  Other features and advantages of the

  vention will appear during the description which goes

  follow from an exemplary embodiment and with reference to the attached drawing in which: Figure 1 is a sectional view of a device

  declutching device comprising a sliding sleeve according to the

  vention, and Figure 2 shows the sleeve separately

slide of Figure 1.

  Figure 1 therefore represents a device for

  clutch in which a clutch stopper 1 is disposed with a radial clearance on a sliding sleeve 2. The outer ring 3 rests by a flange 4 directed radially inwards on a thrust flange 5 directed radially outwards a cage 6 threaded on the outer surface 7 of the sliding sleeve 2 and held

  mechanically by a pressed part 8 of this sleeve.

  The outer ring 3 has several parts in sail-

  lie 9 directed axially, engaged in corresponding housings of the collar 5 directed radially outwards, so that the outer ring 3 is

  maintained against any rotational movement in the di-

  circumferential rection. A damping ring 11 is arranged in the bore of the outer ring 3, of which elastic tongues 12 are engaged in the bore 14 of the cage 10, and which absorbs the greatest movements in the radial direction of the stop d 'clutch 1. Preferably, the inner surface 15 of the sliding sleeve 2, the front surface 16 of the cage 6 fixed on this sleeve, facing the outer ring 3 of the clutch bearing 1, as well as the surface of support 17 of the clutch lever (not shown) receive a smooth or slippery coating. This allows good damping of noise between surfaces 15, 16, 17 and the parts in contact, and thanks to the use of a self-lubricating material, long-term lubrication of the elements which slide on each other. the

  other. To obtain good protection against cor-

  corrosion, the sliding sleeve should also be

  2 made of sheet metal and the cage 6 after they have been cleaned

  appear mechanically to be entirely coated with a plastic material, this coating possibly being formed by

  example using a suspended powder. The rev-! Te-

  plastic material consists for example of poly-

  amide 11, polytetrafluoroethylene, or a material

  self-lubricating with a plastic binder.

  The invention is not limited to the mode of realization

  reading shown. Many variants of realization

  tion are possible. For example, the sliding sleeve can be made in a single piece on which a thrust collar is formed for the support of the clutch bearing.

Claims (3)

  1 - Sliding sleeve, made of sheet steel or the like, for a declutching device, in particular   motor vehicle clutch, provided with a collar-   thrust and with a device intended to receive the clutch lever and on which is disposed a disengaging stop movable radially, sleeve characterized in that at least the inner surface (15), the front surface (16) of the thrust collar (5) facing the clutch release bearing (1) and the bearing surfaces (17) of the clutch lever are provided with a smooth coating having   good dry running properties.   2 - Sliding sleeve according to claim 1, comprising a cage disposed on the outer surface or in the bore and of which the above-mentioned surfaces are intended to receive the clutch release bearing and the clutch lever, sleeve characterized in that all of the area   is covered by a coating. smooth.   3 - Sliding sleeve according to claim 1   or 2, characterized in that the smooth coating is made of   2o plastic, for example polyamide 11, or poly-   tetrafluoroethylene, or a self-lubricating plastic   fiante with a plastic binder.