A damper includes a first passage and a second passage in parallel, a first damping force generation mechanism of the first passage, a case member in which a portion of the second passage is formed, an annular disc disposed to face a bottom part in the case member to be able to be bent by a working fluid in the case member, a first chamber communicating with a first cylinder chamber and a second chamber communicating with a second cylinder chamber which are provided by the disc partitioning the inside of the case member, a first through hole provided in the bottom part of the case member to communicate with the second chamber, a bypass passage provided in parallel to the first through hole and configured to allow communication between the first chamber and the second cylinder chamber, and a second damping force generation mechanism provided in the bypass passage.

In a suspension device, a first piston is movable in an axial direction inside of a cylinder, and an inner pipe that extends in the axial direction is provided inside of the cylinder. A first rod is coupled to the first piston and inserted into the inner pipe. A second rod is coupled to the first piston and projects outwardly from the cylinder. A second piston is movable in the axial direction while sealing a space between an outer surface of the inner pipe and an inner surface of the cylinder. A first gas chamber is located between the second piston and a closure to be arranged outside of the inner pipe. A second gas chamber is located inside of the inner pipe. The first rod includes a first inner passage that communicates with the second gas chamber, and the second rod includes a second inner passage that communicates with the first inner passage.

An adjustable vibration damper has at least one adjustable damping valve, a piston at a piston rod that divides a cylinder into a work chamber on the piston rod side and a work chamber on the side remote of the piston rod. A hydraulic device is connected via a first line to the at least one adjustable damping valve connected to one of the work chambers and via a second line at least indirectly to the other working chamber.

A bearing spring/damper system of a vehicle wheel has a hydraulic vibration damper consisting of a damper cylinder and a damper piston guided therein, the piston rod of which hydraulic vibration damper is fastened to the vehicle body, whilst the damper cylinder is supported to a wheel guiding element. A pretension spring is clamped functionally between the damper piston and a pretension piston which can be displaced hydraulically in the longitudinal direction of the piston rod. The pretension piston is supported hydraulically with respect to the damper cylinder by a support chamber filled with the hydraulic medium of the vibration damper, and can be displaced by a conveying device, which conveys hydraulic medium into or out of the support chamber. The pretension spring is parallel-connected in every possible position of the pretension piston of a bearing spring ultimately clamped between the vehicle body and the wheel for force transmission.

The fluid supply device comprises a screw, which has a male thread formed thereon and rotates, and a nut, which has a female thread formed therein that meshes with the male threading and which, by the screw rotating in a first direction, i.e., the circumferential direction, moves towards a first end in the rotation axis direction, and which, by moving with said movement a piston that forms a reservoir chamber, discharges a fluid stored in the reservoir chamber, wherein, if the fluid is discharged and if the screw is not rotating, first surfaces which form the threading of the male screw and second surfaces which form the threading of the female screw are in contact with each other, and second surfaces which form the threading of the male screw and first surfaces which form the threading of the female screw are not in contact with each other.

The fluid supply device comprises a screw, which has a male thread formed thereon and rotates, and a nut, which has a female thread formed therein that meshes with the male threading and which, by the screw rotating in a first direction, i.e., the circumferential direction, moves towards a first end in the rotation axis direction, and which, by moving with said movement a piston that forms a reservoir chamber, discharges a fluid stored in the reservoir chamber, wherein, if the fluid is discharged and if the screw is not rotating, first surfaces which form the threading of the male screw and second surfaces which form the threading of the female screw are in contact with each other, and second surfaces which form the threading of the male screw and first surfaces which form the threading of the female screw are not in contact with each other.

A valve for an air spring includes a housing member having a center axis and a channel. The housing member includes first and second elements connected by a materially engaging connection in a first region and in abutment with each other in a second region or which are provided directly beside each other. A sealing member may be disposed in the channel and can close the channel or reduce an effective opening cross section. The valve may comprise a channel element that at least partially guides or forms the channel. The channel element may be fixed in the housing member in a form-fit and/or force-fit manner, and the channel element may retain the sealing member in a third region or the channel element may be fixed in/on the first element in a form-fit and/or force-fit manner, and the channel element may retain the sealing member in a third region.

A pressure retaining valve including: a first valve body for an opening of an air spring, the first valve body having an access opening; a second valve body connected to the first valve body and having a chamber fluidly communicating with the access opening and having a side outlet opening; and a return member disposed outside the access opening in the chamber for providing a bias toward the access opening; a closure part disposed in the chamber and movable from a closed condition against the bias to an open condition; and an actuator part having a head portion, a shaft section, and a flow channel, the head portion disposed outside the access opening and having a larger diameter than the access opening, wherein the stem portion is movably disposed through the access opening into the chamber, and the actuator member can move the closure member out of the closed condition.

A gas-charging and flanging machine (10) includes a sealed chamber (13a). The gas-charging and flanging machine is used for carrying out, inside the sealed chamber, charging of a gas into a workpiece (20) and flanging of the workpiece (20) by spinning and pressing. The gas-charging and flanging machine charges a gas into a workpiece and flanges the workpiece on the same machine such that production efficiency can be improved.

A gas-charging and flanging machine (10) includes a sealed chamber (13a). The gas-charging and flanging machine is used for carrying out, inside the sealed chamber, charging of a gas into a workpiece (20) and flanging of the workpiece (20) by spinning and pressing. The gas-charging and flanging machine charges a gas into a workpiece and flanges the workpiece on the same machine such that production efficiency can be improved.