초록 ▼

The invention concerns a device comprising a shift cylinder with a cylinder body (17) bearing a first sleeve (54) for guiding a second sleeve (42) enclosing an axially mobile piston (21) with an intervening piston seal between the second sleeve (42) and the piston (21) and a secondary seal (59) betw

The invention concerns a device comprising a shift cylinder with a cylinder body (17) bearing a first sleeve (54) for guiding a second sleeve (42) enclosing an axially mobile piston (21) with an intervening piston seal between the second sleeve (42) and the piston (21) and a secondary seal (59) between the body (17) and the second sleeve (42) penetrating into the hydraulic chamber. The invention is applicable to motor vehicles.

대표청구항 ▼

[ What is claimed is:] [1.]1. A hydraulic control device for a clutch, especially for a motor vehicle, comprising at least one control cylinder having a first skirt (54), a cylinder body (17) having an anterior base (24) and open at the rear for receiving the first skirt (54) fastened thereto, a pis

[ What is claimed is:] [1.]1. A hydraulic control device for a clutch, especially for a motor vehicle, comprising at least one control cylinder having a first skirt (54), a cylinder body (17) having an anterior base (24) and open at the rear for receiving the first skirt (54) fastened thereto, a piston (21) sliding axially in the cylinder body (17), a piston skirt (42) referred to as a second skirt, which is fixed axially with respect to the piston (21) and which slides axially in the first skirt (54), a piston seal (41) carried by the piston (21), a second seal (41) carried by the cylinder body (17) for cooperation with the first skirt (42), a piston rod (33) having an anterior head (40) for cooperating with the piston (21), wherein the cylinder body (17), the first skirt (54) and the piston (21) are of plastics material while the second skirt (42) is of metal, and wherein the piston (21) has a front face (31) defining the hydraulic chamber (20) and a rear face (31) cooperating with the piston rod (33), wherein the piston (21) is so configured as to receive the head (40) of the piston rod (33) and surrounded by the second skirt (42), and wherein the piston seal (41) is interposed operatively between the outer periphery of the piston (21) and the inner periphery of the second skirt (42), which penetrates into the hydraulic chamber (20), wherein the piston (21) has a transverse wall (30) bounded by the front face (31) and rear face (32), and in that the transverse wall (30) is extended forward by a chimney element (34) and the base (24) of the cylinder body (17) carries an axially projecting element (28) adapted to cooperate with the chimney element (34) to limit forward displacement of the piston (21).