Patent ID: 6382082
Filing Date: 2002-05-07
Classification: F16D

Abstract:
Apparatus for hydraulic control of braking or of a clutch in a motor vehicle, comprising at least one control cylinder (10), wherein the cylinder (10) includes a substantially tubular cylinder body (17), having an internal bore (42, 52) in which there slides axially a piston (20) having a front face (30) which delimits a hydraulic chamber (16), wherein a port (14) for connection of a duct is open into the hydraulic chamber (16), wherein the cylinder body (17) is stepped and comprises a front portion (24) which delimits the hydraulic chamber (16) and in which there is formed at least one front portion (42) of the internal bore in which the piston (20) slides, and a rear portion (26) of enlarged diameter, the two portions (24, 26) being delimited by an annular transverse wall (92) of the cylinder body (17), against which there bears axially an intermediate element (91) received in the rear portion (26) for axially positioning at least one internal sealing member (94) which cooperates with the lateral wall (31) of the piston (20, 36), and wherein the said intermediate element (91) is held axially in the rear portion (26, 56, 113) by means of an annular cylindrical rear sleeve (50) mounted in the rear portion (26, 56) and fixed sealingly in the latter by adhesive bonding or welding, especially by ultrasonic welding, characterised in that the intermediate element (91) is a tubular element constituting a seal carrier (94, 96, 120), having a peripheral internal wall (93) in which at least one internal seal seating (100, 106) is formed which is open radially inwards towards the side wall (37) of the piston (20, 36).