Disclosed is a variable damping force shock absorber including a tube cylinder having an inner tube filled with a fluid and an outer tube, a valve housing coupled to a piston rod in the inner tube and having a connection flow path formed therein, a first piston valve coupled to the outside of the valve housing to partition the inner tube into a compression chamber and a rebound chamber, and a second piston valve provided inside the valve housing, wherein the valve housing includes a magnet provided at an upper portion thereof and connected to the piston rod, and a plunger disposed between the magnet and the second piston valve at a lower portion thereof to selectively open and close the connection flow path by a magnetic field of the magnet, and wherein the fluid passes only through the first piston valve when the plunger closes the connection flow path, and the fluid passes through the first piston valve and the second piston valve when the plunger opens the connection flow path.

The present disclosure relates to a shock absorber having a pressure tube which defines a fluid chamber, and a piston assembly. The piston assembly is disposed within the fluid chamber and divides the fluid chamber into upper and lower working chambers. A reserve tube surrounds the pressure tube to define a reservoir chamber between the reserve tube and the pressure tube. The pressure tube is disposed between a rod guide assembly and a lower mount. A structural integrity of the pressure tube is greater than a structural integrity of the reserve tube, and the pressure tube further operates as a principal load bearing component for the shock absorber.

A damping force controlling shock absorber includes: retainers respectively connected to top and bottom surfaces of the piston, a connection passage communicating with a main passage being formed to vertically penetrate the retainers; housings respectively disposed on corresponding opposite surfaces of the retainers to form pilot chambers on mutual corresponding surfaces of the housings, a pilot passage being formed to vertically penetrate the housings so as to communicate the pilot chambers with the outside; pilot valves that are in close contact with the connection passage between the retainers and the housings to generate a main damping force; and a spool guide that penetrate and connects to the retainers, the housings, and the pilot valves and guides the spool in a state of surrounding the outside of the spool.

Solar tracker systems include a torque tube, a column supporting the torque tube, a solar panel connected to the torque tube, and a damper assembly. The damper assembly includes a first end pivotably connected to the torque tube and a second end pivotably connected to the column. The damper assembly further includes an outer shell, a piston within and moveable relative to the outer shell, a first chamber wall and a second chamber wall within the outer shell at least partially defining a chamber, and a valve within the chamber. The valve includes a first axial end defining a slot and is biased to a first position within the chamber in which the first axial end is spaced from the first chamber wall. The valve is moveable within the chamber from the first position to a second position to passively change a flow resistance of the damper assembly.

A flow adjustment and oil path separation structure of a shock absorber includes inner and outer tubes sheathed and linearly contracted and extended with respect to each other and having a base tube module installed in the inner tube and including a first component and a second component sheathed on each other. A primary oil chamber is formed in the first component. A secondary oil chamber is formed between the first and second components. An oil path separation module includes an oil path separator seat with an ON/OFF installing slot, a primary channel, a secondary channel group, a first adjusting hole and a communication channel. A first adjustment module is installed at the first adjusting hole for adjusting the amount of hydraulic oil in the first adjusting hole. An ON/OFF switch module is installed in the ON/OFF installing slot for switching a flow ON/OFF status of the secondary channel group.

An object is to provide a cylinder device which can be used successfully over a long period of time. The cylinder device includes a cylinder, a piston, an external cylinder, a tank and first piping. The piston is slidably inserted into the cylinder. The piston divides an interior of the cylinder into a rod-side chamber and a piston-side chamber. The external cylinder is disposed outside the cylinder and covers the cylinder. The tank is formed in a space between the cylinder and the external cylinder and stores an operating fluid. The first piping constitutes part of a first passage through which passes the operating fluid supplied to and discharged from the rod-side chamber or the piston-side chamber. The first piping has two ends one of which has a larger outer diameter than the other end. The first piping is disposed in the tank.

A damper includes an inner tube. The damper includes a piston slidably disposed within the inner tube. The piston defines a first working chamber and a second working chamber within the inner tube. The damper also includes an outer tube disposed around the inner tube. The outer tube defines an outer chamber between the inner tube and the outer tube. The damper further includes a cover member mounted on an outer surface of the outer tube. The cover member defines a collector chamber between the outer tube and the cover member. The damper includes a first control valve mounted on the cover member. The damper also includes a second control valve mounted on the cover member and spaced apart from the first control valve.

A hydraulic pressure cushioning device includes: a cylinder; a rod movably provided in the cylinder; a first piston valve section that is provided on the rod. The first piston valve section includes: a first piston member and a second piston member that form a channel; and a single first damping valve with which a first flow of the fluid from the first side to the second side in the channel and a second flow of the fluid from the second side to the first side in the channel are controlled; a bypass path which differs from the channel; and a free piston provided on the rod in such a manner that a flow of the fluid is switched between the channel and the bypass path in accordance with a movement position of the rod.

A damping valve for a vibration damper includes a damping valve body with separate passage channels. The outlet orifices of the passage channels for a flow direction are connected to one another via a groove, which is covered by at least one valve disk and is bounded radially by at least one annular web on the radially inner side with respect to the center axis (A) of the damping valve and at least one annular web on the radially outer side with respect to the center axis (A) of the damping valve. The radially outer web has at least one first portion in which the support is configured as area support for the valve disk, and the radially outer web has at least one second portion in which the support is configured as line support for the valve disk.

A damper assembly for a vehicle suspension system includes a primary damper and a secondary damper. The secondary damper includes a housing having a wall that at least partially surrounds at least a portion of the primary damper, the volume between the wall and the primary damper defining a chamber, and the wall defines an aperture. The secondary damper also includes a piston positioned within the chamber, a conduit defining a flow path that includes the aperture, and a valve disposed along the flow path. The primary damper is configured to provide a base damping force and the secondary damper is configured to provide a supplemental damping force that varies based on the position of the piston within the chamber.