Abstract: The invention relates to a system for the hydraulic control (10) of a clutch (12), e.g. a motor vehicle clutch, comprising an upstream master cylinder (14) which is connected to a down-stream slave cylinder (18) by means of a conduit (16). The invention is characterized in that the system comprises a servo cylinder (30) which is disposed in the conduit (16) between the master cylinder (14) and the slave cylinder (18), said servo cylinder comprising at least one servo piston which can be subjected to an assist force produced by a servo device.

Abstract: In a vibration filter for a transmission with automatic gear changing for a motor vehicle, including a torsion damper disposed between an input or driving element arranged to be driven in rotation by the crankshaft of the motor vehicle engine, and an output or driven shaft arranged to be coupled to an input shaft or driven shaft of the transmission, the torsion damper includes elastic means: the stiffness of the damper is variable and is obtained by virtue of the said elastic means, which are in the form of helical springs oriented substantially radially; the input element is a primary flywheel (10) which has at its radially inner periphery an axial flange (12) for supporting a bearing (13) which centers and guides in rotation a secondary inertial flywheel (20) constituting the output element.

Abstract: The invention relates to a system for the hydraulic control (10) of a clutch (12), e.g. a motor vehicle clutch, comprising an upstream master cylinder (14) which is connected to a down-stream slave cylinder (18) by means of a conduit (16). The invention is characterized in that the system comprises a servo cylinder (30) which is disposed in the conduit (16) between the master cylinder (14) and the slave cylinder (18), said servo cylinder comprising at least one servo piston which can be subjected to an assist force produced by a servo device.

Abstract: In a vibration filter for a transmission with automatic gear changing for a motor vehicle, including a torsion damper disposed between an input or driving element arranged to be driven in rotation by the crankshaft of the motor vehicle engine, and an output or driven shaft arranged to be coupled to an input shaft or driven shaft of the transmission, the torsion damper includes elastic means: the stiffness of the damper is variable and is obtained by virtue of the said elastic means, which are in the form of helical springs oriented substantially radially; the input element is a primary flywheel (10) which has at its radially inner periphery an axial flange (12) for supporting a bearing (13) which centres and guides in rotation a secondary inertial flywheel (20) constituting the output element.

Abstract: In a vibration filter for a transmission with automatic gear changing for a motor vehicle, including a torsion damper disposed between an input or driving element arranged to be driven in rotation by the crankshaft of the motor vehicle engine, and an output or driven shaft arranged to be coupled to an input shaft or driven shaft of the transmission, the torsion damper includes elastic means: the stiffness of the damper is variable and is obtained by virtue of the said elastic means, which are in the form of helical springs oriented substantially radially; the input element is a primary flywheel (10) which has at its radially inner periphery an axial flange (12) for supporting a bearing (13) which centres and guides in rotation a secondary inertial flywheel (20) constituting the output element.

Abstract: The invention concerns an arrangement (10) for fixing a tubular shift cylinder (12), between two mounting and locking positions in a motor vehicle body, comprising means for blocking the cylinder (12) in axial translation including, from the front rearwards, a transverse surface of the cylinder (12), axial elastic means, a body wall (20), pierced with an orifice (18), and a transverse eye mounting (34) of the cylinder (12) passing through a cutout (40) of the orifice (18) and enabling to immobilise the cylinder (12) axially when a rotation of the cylinder (12) locks it by squeezing the wall (20) between the support surface, the axial elastic means and the eye mounting (34).

Abstract: A torsional pre-damping device for damping the impact between a hub and a hub disc. A crown insert (20) made of absorbent material is arranged between the engaging teeth (18) and the engaged teeth (19) of the loose meshing portions (16) defined between the disc and the hub.

Abstract: A liner support disc having tripod like blades (572), each with a central support zone (221A) and two peripheral support zones (522B). A tangential bent portion (380) joins the central zone (221A) to the central zone (161, 162) of the disc, while oblique bent portions join the central zone (221A) to the peripheral zones (522B). A friction liner is bonded to the central zone (221A).

Abstract: A hydraulic clutch having a device for indicating wear in the friction liners of the clutch. A wear indicating member (44) is coupled to the actuating piston (26, 34) for axial straight line movement. The wear indicating member (44) projects outside the clutch casing (10) to mechanically transmit information relating to the displacement of the actuating piston (26).

Abstract: A clutch mechanism including a cover, a diaphragm, a pressure plate and studs for mounting the diaphragm on the cover. The studs have a guide portion with flats for cooperating with lateral edges of orifices formed in the diaphragm. Such an arrangement reduces wear on the guide portions.

Abstract: A clutch module having tongues interposed between a pressure plate and a cover plate. Associated with a diaphragm are resilient grippers which permanently bias the diaphragm toward engagement with the cover plate. The resilient grippers are divided into sectors which are fixed, at each of their circumferential ends, both circumferentially and axially to the cover plate to define an integral tongue.

Abstract: A friction clutch assembly, especially for a motor vehicle, of the pull to release type comprising a clutch casing (10), within which there is arranged a device (20) for controlling declutching, which comprises a clutch release bearing and a hydraulic actuating device (26, 34) comprising at least one actuating piston (34), which is arranged to urge the clutch release bearing axially in a first direction (F1) so as to cause the clutch to be disengaged when the hydraulic actuating device is supplied with fluid under pressure. The casing (10) has a window (54) to enable a removable tool (58) to be introduced for mechanical actuation of the release bearing (20), so as to urge the latter axially in a second direction (F2) opposite to the first direction (F1). The end portion (60) of the removable tool (58) lying within the casing (10) cooperates with a complementary portion (62) of the actuating piston (26, 34).

Abstract: The clutch mechanism includes a cover (1), a diaphragm (2), a pressure plate (3) coupled to the cover (1) by tongues (8) and return hooks (5) coupling the diaphragm (2) to the pressure plate (3). At least some of the hooks (5) are extended outwards in order to form a stop (7) suitable for coming into abutment against a counter-stop (6) formed by one of the edges of a mounting hole (9) in the cover (1).

Abstract: A friction clutch of the pull to release type, includes a clutch casing (10) within which there is arranged a declutching control device (20), which comprises a clutch release bearing and a hydraulic actuating device (26, 34) that comprises at least one actuating piston (34), which is arranged to urge the clutch release bearing (20) axially in a first direction (F1) so as to disengage the clutch when the hydraulic actuating device is supplied with fluid under pressure, together with a lever (44) having a body (46), a first end portion (50) and a second end portion (60). The body (46) of the lever (44 extends through an oblong aperture formed in the wall of the casing (10), while the second end portion of the lever (44) projects outside the casing (10) so as to enable the clutch release bearing (20) to be urged, through the piston (26, 34), axially in a second direction (F2) opposite to the first direction (F1).

Abstract: A liner support disc for supporting friction liners, adapted to constitute a clutch friction wheel, especially for a motor vehicle, of the kind comprising a central portion and a peripheral portion divided into radial blades for receiving the friction liners, with each of the blades being joined integrally to the central portion through a foot, and comprising at least one support zone which is generally parallel to the mean plane of the central portion, for contact with at least one of the friction liners and for fastening of the latter. In a clutch friction wheel, the liners lie on either side of the peripheral portion.

Abstract: In the liner support disc adapted to constitute a clutch friction wheel, especially for a motor vehicle, of the kind comprising a central portion (16) and a peripheral portion divided into radial blades (672) alternating in the circumferential direction with a series of radial tongues (671) in the same plane as the central portion (16) of the liner support disc, in which the blades (672) have, joined by bent portions (421), a central support zone (423) and two peripheral support zones (422) on either side of the zone (423), the peripheral zones (422) being offset axially with respect to the central zone (423), at least some of the tongues (671) have at least one support zone (622) offset axially towards the central zone of the blades (672) by virtue of a connecting bent portion (621).

Abstract: A piston for an hydraulic brake is of the kind comprising an insulating core member and a cup member, joined together by fastening means arranged between the core and cup members.This fastening means is constituted as follows. The base portion of the cup member has a central projection, while the core member has a central cavity which is open at the level of the outer projecting surface of the cup member and which is closed by an end wall forming the base of the cavity, with the projection from the cup member base portion extending through a hole in this base wall. An axially acting resilient means is engaged on the free end of the projection within the cavity and engages against that face of the wall which is directed away from the base portion of the cup member. The invention is particularly applicable to the control of hydraulic brakes, in particular for automotive vehicles.

Abstract: The invention is concerned with an automatic control system for a clutch for coupling two rotatable shafts. The system comprises a piston for controlling a clutch mounted between two shafts. Control of the piston is obtained through a pressurized fluid which acts according to the position of a slide member which is movable in relative rotation controlled by a coupling device sensitive to a speed difference between the shafts. The invention is applicable to an automotive vehicle so as to put it temporarily into four wheel drive.

Abstract: The present invention is concerned with a carrier disc for clutch friction pads comprising a central portion and radial blades. Each blade is joined individually to the central portion by a generally radial blade foot, and is cantilevered asymmetrically from either side of this foot. Each blade is divided into zones by transverse shoulders. For a given diameter, the terminal zone of that portion of the blade that is cantilevered to the greatest extent with respect to the blade foot, and which is intersected by the endmost shoulder, is joined to the central zone by a second foot.

Abstract: An improvement to clutch release bearings which comprise an operating element and a drive element retained together and controlled by axially-acting elastic members formed by a limited number of separate elastic clamps. The elastic clamps are operable to apply a radial flange of the drive element against a radial flange of the operating element. Each elastic clamp comprises an axial part and a radial part. The axial part extends across the flange of the operating element through an opening in the flange. Two axial channels are provided in association with this opening to hold this elastic clamp radially in place. The invention is particularly applicable to self-centering clutch release bearings for automobiles wherein the bearings are capable of permanent self-centering.