A device for volume compensation of damping liquid for a damper includes a hollow cylindrical main body containing the damping fluid. A rod extends through an end of the main body to the interior thereof. The rod is secured to a piston inside the body, which divides a compression chamber from an expansion chamber. A compensation chamber is connected to the compression and expansion chambers via internal channels of the rod and piston. A plurality of orifices in the piston open into the compression chamber and into the expansion chamber. A rigid slider moves freely in translation through, around or inside the piston and/or the rod and closes and opens the orifices to connect the compensation chamber to the expansion chamber (or, respectively, the compression chamber) in the compression (or, respectively, expansion) phases. The device may be used in vehicle wheel suspension assemblies.

A production method for a cylinder device includes a first liquid injection step of injecting a first predetermined amount of working fluid L into the inner cylinder, a first piston rod insertion step of inserting an assembly between the piston rod and the piston into the inner cylinder to dispose the piston at a predetermined position inside the inner cylinder, a second liquid injection step of injecting a second predetermined amount of the working fluid into an upper side of the piston inside the inner cylinder, and a closing step of closing the opening of the outer cylinder with the closing member.

In accordance with one aspect of the present disclosure, a suspension strut for use on a work machine is provided. The suspension strut may have a forged one piece cylindrical inner housing that includes a hollow rod which forms a circumferential piston at an open end and a lower clevis at a closed end of the hollow rod. The suspension strut may further have a forged one piece cylindrical outer housing that includes a hollow barrel having an interior and an exterior surface, a closed end that forms an upper clevis, an open end, and a port on an outside surface of the hollow barrel. Further, the inner and outer housing may be coupled by a disk shaped end cap attached to the open end of the hollow barrel having an inner diameter that is slideably engaged with an outer surface of hollow rod.

The present invention relates to a gas spring comprising a first element, a second element, and a limit, wherein the second element comprises a first chamber and a first opening for accessing the first chamber, the first element is fixable to a reference plane and comprises a second chamber), a second opening for accessing the second chamber, and external walls, and is inserted into the first chamber through the first opening, wherein said first and second elements are movable and reciprocally slide along an axis, wherein the limit comprises a stem and a head adapted to slide through the second opening into the second chamber parallel to the axis so as to limit the maximum travel of the second element to the extension of the external walls of the first element, wherein said first and second chambers communicate through an existing play between said stem and said second opening, and the second element slides through the first opening along the external walls of the first element.

In a liquid sealing bush, in an outer peripheral surface (13os) of an intermediate tube (13), a main seal protrusion portion (23) extending over an entire length in a circumferential direction and pressed against an inner peripheral surface (11is) of an outer tube (11) is separately provided at each position sandwiching a liquid chamber (15) and an orifice passage (16) from both sides in an axial direction, and in the outer peripheral surface (13os) of the intermediate tube (13), an outer seal protrusion portion (22) extending over the entire length in the circumferential direction and pressed against the inner peripheral surface (11is) of the outer tube (11) is separately provided at each position sandwiched between two main seal protrusion portions (23) in the axial direction and sandwiching the liquid chamber (15) and the orifice passage (16) from both sides in the axial direction, in which, in at least one of two outer seal protrusion portions (22), a recessed portion (24) recessed inward in a radial direction and penetrating in the axial direction is formed in a portion separated from the liquid chamber (15) in the circumferential direction.

An adjustable vibration damper for a vehicle may include an outer tube, an intermediate tube, and an inner tube arranged coaxially. A concentric compensation chamber between the outer tube and the intermediate tube may receive a hydraulic fluid and a gas. A piston rod may include a piston disposed movably in the inner tube and dividing an interior of the inner tube into first and second working chambers. The adjustable vibration damper may also include first and second damper valves arranged on an outer wall. The first working chamber may be fluidically connected to the compensation chamber by the first damper valve for adjustment of a pressure stage, and the second working chamber may be fluidically connected to the compensation chamber by the second damper valve for adjustment of a traction stage.

An accumulator for a damper is provided. The accumulator includes a housing defining a longitudinal axis, a fluid connector and a bag. The bag includes a plurality of annular discs disposed adjacent to each other. Each annular disc includes an inner diameter defining a through aperture and an outer diameter. The plurality of annular discs includes a first end disc, a second end disc and one or more intermediate discs. Each intermediate disc is disposed between two adjacent annular discs. The inner diameter of the first end disc is connected to the fluid connector. The inner diameter of each intermediate disc is connected to the inner diameter of one adjacent annular disc. The outer diameter of each intermediate disc is connected to the outer diameter of the other adjacent annular disc. A solid cover disc is connected to the outer diameter of the second end disc.

A production method for a cylinder device includes a first liquid injection step of injecting a first predetermined amount of working fluid into the inner cylinder, a first piston rod insertion step of inserting an assembly of the piston rod and the piston into the inner cylinder to dispose the piston at a predetermined position inside the inner cylinder, a second liquid injection step of injecting a second predetermined amount of the working fluid into an upper side of the piston inside the inner cylinder, and a closing step of closing the opening of the outer cylinder with the closing member.

A system includes a first cylinder. The first cylinder includes a first piston mounted in the first cylinder and a first channel formed in an inner wall of the first cylinder. The first cylinder is configured to hold a pressurized gas. The system further comprises a second cylinder surrounding the first cylinder. The second cylinder comprises a second piston mounted in the second cylinder. The second piston is configured to surround the first cylinder. The second cylinder further comprises a second channel formed in the inner wall of the second cylinder. The second cylinder is configured to hold a pressurized gas. The system further includes one or more seals coupled to the first and second pistons.

A vibration damper may be used in connection with a motor vehicle. The vibration damper may include a hydraulic device for damping vibrations. The vibration damper may also include at least one shut-off valve connected fluidically to the hydraulic device at the vibration damper. The shut-off valve may be capable of being connected fluidically to at least one of a pump or a filling apparatus for filling the vibration damper with hydraulic fluid. The shut-off valve may comprise a valve housing with a first connector for the pump, a second connector for the filling apparatus, and a third connector for the hydraulic device.