A damper system for a vehicle is provided that includes a pressure tube and a piston assembly separating the pressure tube into first and second working chambers. A frequency dependent damper assembly, coupled to a piston rod at a position below the piston assembly, includes a plunger sleeve that is longitudinally moveable to transmit an adaptive force to a first valve assembly mounted to the piston assembly. The frequency dependent damper assembly includes first and second accumulation chambers that are separated by a floating piston. A second valve assembly, carried on the floating piston, controls fluid flow between the second accumulation chamber and the second working chamber. A bleed channel in the floating piston allows fluid flow between the first and second accumulation chambers, which reduces the adaptive force the plunger sleeve applies to the first valve assembly during high frequency, low velocity rebound inputs.

A damper system for a vehicle is provided that includes a pressure tube and a piston assembly separating the pressure tube into first and second working chambers. A frequency dependent damper assembly, coupled to a piston rod at a position below the piston assembly, includes a plunger sleeve that is longitudinally moveable to transmit an adaptive force to a first valve assembly mounted to the piston assembly. The frequency dependent damper assembly includes first and second accumulation chambers that are separated by a floating piston. A second valve assembly, carried on the floating piston, controls fluid flow between the second accumulation chamber and the second working chamber. A bleed channel in the floating piston allows fluid flow between the first and second accumulation chambers, which reduces the adaptive force the plunger sleeve applies to the first valve assembly during high frequency, low velocity rebound inputs.

A center biased actuator having an outer cylinder, a slave cylinder linearly transposed within the outer cylinder, a rod assembly with a piston linearly transposed within the slave cylinder and a rod extending from the outer cylinder, one or more first dynamic seals arranged to act on a sidewall of the rod to inhibit hydraulic fluid leaking from the outer cylinder, one or more second dynamic seals arranged to act on a sidewall of the slave cylinder or an inner surface of the outer cylinder to inhibit hydraulic fluid leaking from the outer cylinder, and a gas chamber comprising a sealed expandable chamber containing gas. The expandable chamber is arranged to act on hydraulic fluid within the center biased actuator to bias the center biased actuator to assume an intermediate condition which lies between a compressed condition and an extended condition.

A damper includes a cylinder, an annular rod guide, a rod, an annular oil seal, and an annular seal holder. The cylinder internally forms an action chamber. The rod guide is secured to one side opening of the cylinder. The rod is inserted through an inner peripheral side of the rod guide so as to be axially movable. The oil seal is installed to the action chamber side of the rod guide to be slidably in contact with an outer peripheral surface of the rod. The seal holder supports the oil seal from the action chamber side. The rod guide includes a holding portion to hold the seal holder.

A pneumatic spring strut assembly comprises a cylinder comprising a working end and a boosting chamber. The working end includes a first volume of gas and the boosting chamber includes a second volume of gas. A temperature control valve assembly is disposed in the interior volume separating the working end from the boosting chamber and includes an over-pressure valve configured to release the second volume of gas into the working end when the pressure within the boosting chamber increases above the normal pressure range of operation. A valve is disposed in the wall of the cylinder, in the working end thereof, and is configured to yield, to thereby vent the first volume of gas to atmosphere, when the pressure within the interior volume of the working end increases above the normal pressure range of operation.

A gas pressure spring is provided including an expanding wax as a compensating medium for reducing a temperature dependency of a spring force of the gas pressure spring in an operating temperature range of the gas pressure spring spanning a minimum temperature of 40 C. to +10 C. up to a maximum temperature of +40 C. to +100 C. The expanding wax includes at least one liquid phase and at least one solid phase in the entire operating temperature range, the expanding wax comprising a number of primary alcohols. Also provided is a drive system for a flap including a gas pressure spring for supporting the flap, and an electromechanical drive for driving the flap.

A pneumatic spring strut assembly comprises a cylinder wall defining an interior volume having a working end and a boosting chamber adjacent to the working end, the working end including a first volume of gas and the boosting chamber including a second volume of gas, a piston assembly disposed for reciprocation in the working end of the interior volume, a piston rod having a proximal end secured to the piston and a distal end projecting out of the interior volume, a temperature control valve assembly disposed in the interior volume separating the working end from the boosting chamber and including an engineered portion that is configured to prevent fluid flow between the working end and the boosting chamber while the first volume of gas is present in the working end and to permit fluid flow between the working end and the boosting chamber should the working end be evacuated of the first volume of gas.

A temperature compensating valve assembly is provided that includes a bimetallic spring that deforms from a closed position to an open position in response to temperature, and a single-piece valve body having an aperture therethrough and having an open end for receiving the bimetallic spring. The single-piece valve body includes integral retainers for retaining the bimetallic spring in the open end in a location such that the aperture is blocked by the bimetallic spring when in the closed position and is not blocked by the bimetallic spring when in the open position.

A damper includes a cylinder, an annular rod guide, a rod, an annular oil seal, and an annular seal holder. The cylinder internally forms an action chamber. The rod guide is secured to one side opening of the cylinder. The rod is inserted through an inner peripheral side of the rod guide so as to be axially movable. The oil seal is installed to the action chamber side of the rod guide to be slidably in contact with an outer peripheral surface of the rod. The seal holder supports the oil seal from the action chamber side. The rod guide includes a holding portion to hold the seal holder.

The invention relates to a gas pressure spring (50) comprising a working piston (2) which is guided displaceably in a working cylinder (1) along a stroke axis (H), a compensating cylinder (12) which encloses the working cylinder (1), and a compensating piston (10) which is of hollow-cylindrical shape and is guided displaceably in the compensating cylinder (12) along the stroke axis (H). The working cylinder (1) has an open end (1b), at which the compensating cylinder (12) forms a projection (15) beyond the working cylinder (1) with a closed end (15b). The compensating piston (10) separates a working chamber (1a) which is arranged in the working cylinder (1), a compensation chamber (12a) which is arranged between the working cylinder (1) and the compensating cylinder (12), and a restoring chamber (15a) arranged in the projection (15) from one another and is open at an upper side (10a) of the balancing piston (10) facing the working chamber (1a). The gas spring (50) comprises a seal (8) arranged on the upper side (10a) of the balance piston (10) which seals the balance piston (10) to the working cylinder (1) and to the balance cylinder (12).