Abstract: A hydraulic element, in particular for arranging in a pressure line between a master cylinder and a slave cylinder of a hydraulic clutch actuating arrangement, having a housing which has a master-cylinder-side hydraulic connection and a slave-cylinder-side hydraulic connection and which holds a valve arrangement, a simpler design is obtained in that the valve arrangement has two valve bodies which are mounted in a floating fashion in the housing and which can be moved relative to one another counter to the force of a spring.

Abstract: A hydraulic system, especially for motor vehicles includes a master cylinder, a slave cylinder and a pressure medium line connected thereto. The invention provides a hydraulic system which is simple or economical to produce by virtue of the fact that the hydraulic system includes at least one hydraulic plug-type connection with a plug connector and a socket contact and the plug connector includes an abutment and a sealing element which are made of different materials and which are connected together in a material fit.

Abstract: A hydraulic element, in particular for arranging in a pressure line between a master cylinder and a slave cylinder of a hydraulic clutch actuating arrangement, having a housing which has a master-cylinder-side hydraulic connection and a slave-cylinder-side hydraulic connection and which holds a valve arrangement, a simpler design is obtained in that the valve arrangement has two valve bodies which are mounted in a floating fashion in the housing and which can be moved relative to one another counter to the force of a spring.

Abstract: A pressure-limiting device in the hydraulic path for a clutch including at least one restrictor member having a central restrictor bore for pressure reduction and a cup-shaped retaining ring to which pressure is applied by a spring and the bottom of which has a central bore and, radially spaced therefrom, a plurality of radially spaced openings arranged on a reference circle. At least one of the restrictor member and the central restrictor bore is activatable when a predetermined volumetric flow rate of the fluid is exceeded during clutch engagement and the plurality of radially spaced openings is closable when a predetermined pressure drop is exceeded. The central restrictor bore can be activated independently of temperature because the surface area acting on the retaining ring is smaller in the unshifted state than during shifting, resulting with the temperature-dependent pressure losses caused by leakage between the retaining ring and housing being compensated for.

Abstract: A pressure-limiting device in the hydraulic path for a clutch that includes at least one restrictor member having a central restrictor bore for pressure reduction and a cup-shaped retaining ring to which pressure is applied by a spring and the bottom of which has a central bore and, radially spaced therefrom, a plurality of radially spaced openings arranged on a reference circle. At least one of the restrictor member and the central restrictor bore is activatable when a predetermined volumetric flow rate of the fluid is exceeded during clutch engagement and the plurality of radially spaced openings is closable when a predetermined pressure drop is exceeded.

Abstract: A hydraulic system, especially for motor vehicles includes a master cylinder, a slave cylinder and a pressure medium line connected thereto. The invention provides a hydraulic system which is simple or economical to produce by virtue of the fact that the hydraulic system includes at least one hydraulic plug-type connection with a plug connector and a socket contact and the plug connector includes an abutment and a sealing element which are made of different materials and which are connected together in a material fit.

Abstract: The piston of a master cylinder in the power train of a motor vehicle is made, at least in part, of a thermosetting plastic material and cooperates with one or more annular seals to ensure that a source of hydraulic fluid is communicatively connected with the chamber in the housing of the master cylinder when the piston is moved by one or more springs or otherwise in a sense to increase the volume of the chamber. When a pedal or another actuator causes the piston to expel pressurized fluid from the master cylinder into a slave cylinder, the seal or seals cooperates or cooperate with the housing and/or with the piston of the master cylinder to seal the source from the chamber of the master cylinder. The slave cylinder can actuate the friction clutch between the prime mover and the transmission in the power train of the motor vehicle.

Abstract: An hydraulic system that includes a master cylinder, a slave cylinder, a fluid conduit extending between the cylinders, and a pressure relief valve within the conduit between the cylinders. The pressure relief valve includes at least one port that is closed by an elastic member that overlies the port and that opens when fluid pressure acting through the port exceeds a predetermined level to cause the elastic member to open the port.

Abstract: A liquid reservoir, particularly for use in an hydraulic system. The reservoir includes a container and a cover cap, and it is intended for containing an hydraulic pressure medium. A pressure equalization component is provided within the container for compensating for pressure differences between the interior of the container and the surrounding atmosphere, and a level compensation component is provided for compensating for changes in the volume of the pressure medium. The pressure equalization component is functionally separate from the level compensation component.