Abstract: In an electromagnetically operated valve, the armature of a solenoid is arranged in substantial alignment with a valve seat surrounding a channel. The valve seat has a substantially planar surface. A valve member also having a substantially planar surface is provided to sealingly engage the planar surface of the valve seat. The armature of the solenoid has a spherical end face engaging the annular valve member.

Abstract: A shock absorber comprises a tube with a cavity therein and a piston rod extending through one end of the tube. At this end of the tube there is provided a gasket. Moreover, for guiding the piston rod, there are provided guiding rollers. These guiding rollers are distributed about the axis of the tube and engage the piston rod by a concave circumferential face, the curvature of which substantially corresponds to the curvature of the piston rod.

Abstract: In a double-tube vibration damper the working chamber adjacent the piston rod guide member is connected to the compensation chamber surrounding the cylinder through a by-pass valve. The by-pass valve is mounted in the cylinder or in a structural member stationary with respect to the cylinder. The by-pass valve has a cross-sectional area variable in dependency on a pressure signal or an electric signal. The damping characteristics of the vibration damper can be varied e.g. in dependency on the load charged onto the vehicle of which the vibration damper is a part.

Abstract: In a cylinder piston device having an axis and two end walls, a cavity is defined between the two end walls. A piston rod is axially movable with respect to the cylinder member and passes through one of the end walls. The piston rod is at least partially defined by a piston rod tube. A piston unit is defined by a radially widened portion of the piston rod tube. The piston unit separates the cavity into two working chambers adjacent respective end walls, one of the working chambers being an annular working chamber radially extending between a radially outer surface of the piston rod and a radially inner surface of the cylinder member. Fluid passages extend between the working chambers across the piston unit. The fluid passages includes at least one opening extending through the piston rod tube.

Abstract: In a pressurized fluid device a cavity is defined within a container. A piston rod passes through a piston rod guide and seal unit of the container. The piston rod guide and seal unit has an axially inner and an axially outer sealing element sealingly engaging the piston rod. The axially inner sealing element acts as a check valve permitting flow of fluid towards the cavity and preventing flow of fluid out of the cavity. An intermediate chamber is defined between the axially inner and the axially outer sealing element around the piston rod. A filling passage is provided across the piston rod guide and sealing unit. This filling passage includes an axially outer filling passage section across the axially outer sealing element between the intermediate chamber and the exterior of the pressurized fluid device.

Abstract: A vibration damper including a vibration damper mechanism composed of a piston-and-cylinder construction located within a pipe jacket wherein fitting elements such as a spring retainer and a steering knuckle support are attached on the pipe jacket by a mounting construction in accordance with the invention. The fitting elements are located on the pipe jacket at their corresponding positions and they are deformed in such a way that radially inwardly directed projections of the fitting elements are shaped in conformity with corresponding indentations of the pipe jacket in order to provide a reliable locking connection between the fitting elements and the pipe jacket in a simple and economical manner.

Abstract: A hydropneumatic damping device particularly for spring legs of automotive vehicles comprises an inner cylinder, an outer container, a central cavity within the inner cylinder, an annular cavity between the inner cylinder and the outer container, a piston rod with a piston unit, venting passage means between the central cavity and the annular cavity extending across a cavity-closing unit and check valve means associated to said venting passage means. The check valve means comprises an annular check valve member in frictional sliding engagement with the piston rod for axial movement with the piston rod towards a sealing position during inward movement of the piston rod and towards an opening position during the outward movement of the piston rod. First and second abutment means are provided for defining the sealing and the opening position of the annular check valve member, respectively.

Abstract: In a vibration damper arrangement for vehicles, an axially extending vibration damper of the piston rod-cylinder type is mounted in a receptacle in a vibration damper support. The damper includes an axially extending jacket tube which is removably secured in the receptacle by a fastening device attached to one end of the tube. The fastening device exerts a tension force on the damper causing a stop surface on the jacket tube to be biased against another stop surface on the receptacle. At least one of the stop surfaces extends obliquely of the jacket tube axis.

Abstract: In illustrative embodiments a method has been shown for manufacturing a piston rod unit. The piston rod unit includes a metallic tube shaped piston rod member defining a cavity therein and at least one terminal member having a fastening pin fastened within a respective end portion of the cavity. The fastening pin is provided with an outer diameter which is larger than the initial inner diameter of the piston rod member. This fastening pin is pressed into an end portion of the cavity so as to radially expand the piston rod member along at least a part of the end portion to an expanded outer diameter larger than the initial outer diameter of the tubular piston rod member. Hereupon the piston rod member is radially compressed by hammering within the area of the expanded outer diameter until the initial outer diameter is substantially reestablished.

Abstract: A hydraulic system suitable for supplying fluid under pressure to the brakes and other elements of an automotive vehicle includes a valve casing formed with a first port, normally connected to a pump, a second port normally connected to a fluid storage vessel and the vehicle element to be supplied, and a third port leading to a sump. A valve slide moves in the casing and defines therewith a conduit. The conduit connects the first and third ports in a first slide position and is closed in a second slide position. A spring-loaded check valve connects the first and second ports only when the fluid pressure in the first port is higher than in the second port. A spring permanently biases the valve slide toward the second position while the fluid pressure in the second port tends to move the slide toward the first position. The biasing force of the spring decreases during movement of the valve slide from the second toward the first position.