Abstract: The invention relates to a machining device (D) such as a device associating a machine-tool (100) with a workpiece holding device (200) having an axis about which the workpiece is rotated transversally (A) in relation to the downward axis (Z), the workpiece to be machined (300) being a long workpiece such as a workpiece comprising surfaces to be machined that are concentrated at the two ends thereof. Said machining device is characterised in that the workpiece holding device (200) consists of a frame (210) supporting two guiding bearings (210 and 230) for rotatably guiding the workpiece according to the transversal rotation axis (A), the structure formed by the frame (210) and the two bearings (220 and 230) being closed by the workpiece to be machined (300) by fixing the ends of the workpiece to the bearings (310 and 220). The invention also relates to a method for machining long workpieces.

Abstract: A device having a rigid rod mobile in a translational and/or rotational movement, whereof one end penetrates inside a recess of a piston and is fixed by a swivel to the recess of the piston directly or via an insert. The insert is mounted inside the recess of the piston, with a mechanism for axially locking the rod or the insert relative to the piston. The locking mechanism includes a stop borne by the piston to provide axial locking along a direction corresponding to the mounting direction of the rod in the piston, and a washer borne by the insert or the rod. The washer has peripheral fins elastically deformable in the radial direction and is pressed against the inner wall of the recess of the piston by being deformed to lock the insert or the rod in the opposite direction.

Abstract: The invention concerns a device (1) comprising a rigid rod (50) mobile in a translational and/or rotational movement, whereof one end penetrates inside a recess (30b) of a piston (30) and is fixed (60) by a swivel to the recess (30b) of the piston directly or via an insert (60), said insert being then mounted inside the recess (30b) of the piston (30), and means (70) for axially locking the rod (50) or the insert (60) relative to the piston (30). The invention is characterised in that said locking means (70) comprise a stop (32) borne by the piston (30) to provide axial locking along a direction corresponding to the mounting direction of the rod in the piston, and a washer (72) borne by the insert (60) or the rod (50), said washer (72) having peripheral fins (76) elastically deformable in the radial direction being pressed against the inner wall of the recess (30b) of the piston (30) by being deformed to lock the insert or the rod in the opposite direction.

Abstract: The invention relates to a piston for a hydraulic control device for a clutch, especially the clutch of an automobile, having a tubular metal sleeve with an internal transversal wall which is integral with the tubular body of the sleeve. A hydraulic chamber is defined towards the front of the sleeve where the piston is mounted so as to slide axially.

Abstract: A hydraulic control device for a motor vehicle clutch, comprising at least a control cylinder (10) wherein the cylinder (10) comprises a substantially tubular cylinder body (17) wherein a piston (20) slides axially defining a cylindrical hydraulic chamber (16), wherein the cylinder body (17) comprises a main body (18) and a rear tube (50) guiding the piston (22). The rear tube (50) and the main body (18) co-operate through matching cylindrical surfaces to enable the rear tube (50) and the main body (18) to be assembled by axial nesting and laser welding.

Abstract: The invention relates to a device (10) comprising a cylinder body (17) in an inner bore hole (22) in which a piston (21, 42) is mounted in such a way that it can slide axially, whereby the cylinder body (17) comprises at least one part in the front of the blind hole (17a) and one center part bearing a sealing joint, whereby both parts are fitted axially and consecutively from front to back and are interfixed in a sealed manner. Said inner bore hole comprises two front and rear sections which are substantially coaxial and concentric and are used to guide the piston (21,42) in an axially sliding manner. The invention is characterized in that both front (62) and rear (60) sections which are used to guide the piston (21,42) in a sliding manner belong to the center part (17B,64) of the cylinder body.

Abstract: A device wherein the cylinder (10) comprises a cylinder body (17) wherein a piston (20) slides, and comprising an intermediate element (91) housed in the cylinder body rear part (26), for axial positioning of at least an inner sealing joint (94) co-operating with the side wall (37) of the piston (20, 36), and which is axially maintained in the rear part (26) by a cylindrical annular rear sleeve (50) mounted in the rear part (26, 56) and sealingly fixed therein by bonding or welding, in particular ultrasonic welding. The intermediate element (91) is a tubular element forming joint-holder(s) (94, 96, 120) in the inner peripheral wall (93) of which is formed at least an inner joint housing (100, 106) open radially inwards towards the side wall (37) of the piston (20, 36).

Abstract: A clutch control device (10) comprising a cylinder body (17) and a piston (21, 42) axially sliding in an inner bore (22) of the cylinder body (17) and at least a dynamic seal (59A, 59C) borne by the cylinder body (17, 17B). The cylinder body (17) comprises, axially arranged successively from the front rearwards, a blind front component (17A) comprising a base (24), a central component (17B) and a rear component (17C) open rearwards made of plastic material and assembled together sealed by welding (58A, 58C) with indirect heat input, and the inner bore (22) comprises a front portion (22A) and a rear portion (22C), and the dynamic seal (59A, 59C) is housed in the central component (17b) of the cylinder body (17).