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.

A method for operating a controllable shock absorber may involve damping movement of a valve body by loading the valve body with a back pressure on an outflow side. Further, the controllable shock absorber may include a cylinder tube, a piston within the cylinder tube that divides the cylinder tube into two working spaces and includes a couple fluid leadthroughs connecting the working spaces, and first and second valve assemblies for damping piston movement in first and second actuating directions that are disposed on the leadthroughs. Each valve assembly may have a pilot control chamber and a valve plate that is either seated on or spaced apart from a valve seat in closed and open valve positions. Each valve plate can be prestressed closed by pressure loading the pilot control chamber. The pressures of the pilot control chambers can be set by a pilot control valve that comprises a movable valve body. As a result, an outflow cross section between the pilot control chambers and the working spaces can be set. The valve body may be loaded on an outflow side with a back pressure, as a result of which movement of the valve body is damped.”

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 damping valve includes a valve seat member that includes a port and a first valve seat, a shaft member disposed on the valve seat member, an annular main valve element that is mounted on the shaft member, seats on and separates from the first valve seat, and includes a second valve seat on an opposite side of the valve seat member, a sub valve element that is mounted on the shaft member, and seats on and separates from the second valve seat, a valve-element-between chamber that is disposed between the main valve element and the sub valve element, and on an inner peripheral side of the second valve seat, a restrictive passage that causes the port to be communicated with the valve-element-between chamber to provide a resistance to a flow of a passing fluid, a main valve element biasing part biasing the main valve element to the valve seat member side, and a sub valve element biasing part biasing the sub valve element to the main valve element side. The restrictive passage is formed of a ring-shaped gap between the main valve element and the shaft member.

Provided is a method for the production of a nozzle piston for arrangement in a damping space of a damper, which contains a damping fluid, wherein the piston divides the damping space into a first fluid chamber and a second fluid chamber. Also provided is a production method with the method according to the invention for a damper. Also provided is a nozzle piston for arrangement in a damping space of a damper, which contains a damping fluid, wherein the nozzle piston can be obtained by means of ultra-short pulse lasering of the recess from a piston blank. Also provided is a damper having a nozzle piston according to the invention. Also provided is a production plant for the production of a damper having at least one ultra-short pulse laser station for machining a piston blank for the damper by ultra-short pulse lasering.

A vibration damper valve assembly may include a valve main body, first and second main stage flow paths, first and second disc valve packs, and first and second main stage bypass flow paths. The first disc valve pack may include a first outer disc valve pack, a first flow path bypass disc, a first loading element, and a first covering element, with the first loading element being arranged on one side of the first covering element such that a loading force is formed on the first covering element. The second disc valve pack may include a second outer disc valve pack, a second flow path bypass disc, a second loading element, and a second covering element, with the second loading element being arranged on one side of the second covering element such that a loading force is formed on the second covering element.

A variable stiffness vibration damping device includes a first support member, a second support member, a pair of main elastic members, a partition elastic member, a communication passage, a coil, a yoke, and a magnetic fluid. The second support member includes an axial portion and a pair of outer flanges. The communication passage is provided in one of the first support member and the axial portion such that a first liquid chamber and a second liquid chamber communicate with each other via the communication passage. The communication passage includes a circumferential passage. The coil is wound coaxially with the one of the first support member and the axial portion. The yoke is included in the one of the first support member and the axial portion and forms a magnetic gap overlapping at least partially with the circumferential passage.

A variable stiffness vibration damping device includes a first support member, a second support member, a pair of main elastic members, a partition elastic member, a first communication passage, a pair of first radial walls, a second communication passage, a coil, a yoke, and a magnetic fluid. The second support member includes an axial portion. The first communication passage is provided in one of the first support member and the axial portion such that a first liquid chamber and a second liquid chamber communicate via the first communication passage. The pair of first radial walls partition one of the first liquid chamber and the second liquid chamber into a pair of third liquid chambers. The second communication passage is provided in the one of the first support member and the axial portion such that the pair of third liquid chambers communicate via the second communication passage.

A vehicle suspension damper including: a cylinder; a piston assembly; and an adjuster, wherein the piston assembly compresses fluid as it moves within the cylinder and the adjuster obstructs fluid flow from a first side of a damping piston of the piston assembly to a second side of the damping piston.

A shock absorber includes a first passage through which a working fluid flows from one chamber in a cylinder due to movement of a piston, a second passage which is provided in parallel with the first passage, a disk which is provided in the first passage and generates a damping force, a spool member, having a tubular shape, which is capable of changing a biasing force against the disk by moving in an axial direction, a pilot chamber which is provided in the second passage, located on an inner peripheral side of the spool member, and generates a biasing force against the disk in the spool member, and a closing member which blocks a flow of the working fluid from the pilot chamber to the other chamber and is provided to be movable with respect to the spool member.