Abstract: Master cylinder assembly (1) for hydraulic control includes a master cylinder body (2) having a longitudinal bore (3). A piston (6) is arranged in the said bore and includes a seal packing (15) separating two chambers (16, 29) adapted to contain a liquid. The piston also includes a recovery conduit (36) connecting the chambers and by-passes the seal packing, and a valve (38). When the piston is in a rest position, an actuator (54) adjusts the position of the valve between an open position opening the recovery conduit and a closed position closing the recovery conduit.

Abstract: This braking force amplifier with dual amplification ratios includes a thrust assembly (71) comprising a reaction rod (82) connected to the master-cylinder of the corresponding brakes and mounted to be axially displaceable under the control of a plunger (22) between a first braking state corresponding to a first ratio of amplification of the braking force, and a second braking state corresponding to a second ratio of amplification of the braking force, and a deformable reaction disc (96) interposed between a piston (70) and the plunger on the one hand, and the reaction rod on the other. The thrust assembly includes means (104) for absorbing the deformations of the reaction disc, the said deformations contributing to determining the braking force for which passage between the first and the second braking states takes place.

Abstract: An apparatus and method for attaching a tube member to a housing of a vacuum brake booster is provided. A tube member includes a body portion, an outer surface, a first end, and a second end. A first collar portion is disposed between the first end and the body portion, and extends outward from the outer surface. A lip portion is disposed at the first end and extends outward from the outer surface. The first collar portion and the lip portion define a recess to receive a first housing member. The tube member may further include a second collar portion spaced apart from the first collar portion and extending outward from the outer surface. The second collar portion may preferably define a contact surface for contacting an inner surface of a second housing member.

Abstract: The present invention relates to a system and a process for assembling a tube in a connecting element, and a housing for a braking assistance servomotor, in a device for controlling braking including such a system. The system for assembling a tube (10) with a female connecting element (11) comprising a longitudinal bore (14) provided with a transversal shoulder (14a), system in which a hollow end portion (18) of the tube is inserted in the said bore in abutment against its shoulder, is characterized by the fact that the longitudinal wall of the said end portion comprises a zone (23) deformed by compression between the said shoulder and the remainder of the tube and deformed transversally within the internal wall of the bore to provide mechanical connection and tightness between the tube and the connecting element.

Abstract: A connecting member and method of attaching the connecting member and a tube member to a housing of a vacuum brake booster is provided. The connecting member includes a cylindrical body portion having a first end and a second end. A rim portion is formed between the first end and the second end, and a stem portion is formed at the second end of the cylindrical body portion. The stem portion includes a tapered end portion to allow the stem portion to flow radially outward when a force is applied to the stem portion. The cylindrical body portion further includes a first opening formed in the cylindrical body portion adjacent to the first end of the cylindrical body portion and a second opening in communication with the first opening. The first opening has a first diameter and the second opening has a second diameter. The second diameter is less than the first diameter. The stem portion is deformed to create a seal between a portion of a housing member and the connecting member.

Abstract: An apparatus and method for attaching a tube member to a housing of a vacuum brake booster is provided. A tube member includes a body portion, an outer surface, a first end, and a second end. A first collar portion is disposed between the first end and the body portion, and extends outward from the outer surface. A lip portion is disposed at the first end and extends outward from the outer surface. The first collar portion and the lip portion define a recess to receive a first housing member. The tube member may further include a second collar portion spaced apart from the first collar portion and extending outward from the outer surface. The second collar portion may preferably define a contact surface for contacting an inner surface of a second housing member.

Abstract: A connecting member and method of attaching the connecting member and a tube member to a housing of a vacuum brake booster is provided. The connecting member includes a cylindrical body portion having a first end and a second end. A rim portion is formed between the first end and the second end, and a stem portion is formed at the second end of the cylindrical body portion. The stem portion includes a tapered end portion to allow the stem portion to flow radially outward when a force is applied to the stem portion. The cylindrical body portion further includes a first opening formed in the cylindrical body portion adjacent to the first end of the cylindrical body portion and a second opening in communication with the first opening. The first opening has a first diameter and the second opening has a second diameter. The second diameter is less than the first diameter. The stem portion is deformed to create a seal between a portion of a housing member and the connecting member.

Abstract: The present invention relates to a system and a process for assembling a tube in a connecting element, and a housing for a braking assistance servomotor, in a device for controlling braking including such a system. The system for assembling a tube (10) with a female connecting element (11) comprising a longitudinal bore (14) provided with a transversal shoulder (14a), system in which a hollow end portion (18) of the tube is inserted in the said bore in abutment against its shoulder, is characterized by the fact that the longitudinal wall of the said end portion comprises a zone (23) deformed by compression between the said shoulder and the remainder of the tube and deformed transversally within the internal wall of the bore to provide mechanical connection and tightness between the tube and the connecting element.

Abstract: This braking force amplifier with dual amplification ratios includes a thrust assembly (71) comprising a reaction rod (82) connected to the master-cylinder of the corresponding brakes and mounted to be axially displaceable under the control of a plunger (22) between a first braking state corresponding to a first ratio of amplification of the braking force, and a second braking state corresponding to a second ratio of amplification of the braking force, and a deformable reaction disc (96) interposed between a piston (70) and the plunger on the one hand, and the reaction rod on the other. The thrust assembly includes means (104) for absorbing the deformations of the reaction disc, the said deformations contributing to determining the braking force for which passage between the first and the second braking states takes place.