An adjustable vibration damper includes at least one adjustable damping valve, with 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. The cylinder is at least partially enclosed by an intermediate tube that forms a fluid connection between one of the work chambers and the adjustable damping valve. A hydraulic apparatus is connected to the fluid connection of the one work chamber via a first line and to the other work chamber via a second line.

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.

The present invention generally relates to vehicle and machinery in agriculture, construction, forestry, mining and powersport. It further generally relates to track systems and traction assemblies used with such vehicles. The track system comprises a drive wheel and a plurality of idler wheels mounted on a support frame. At least one of the plurality of wheels is operatively mounted on the support frame via a damping system adapted to provide a damping value dynamically varying as a function of the load applied. Track systems do not benefit from the damping provided by the layer of air within the tires. The disclosed damping system has the objective to overcome one this drawback by providing a smooth ride for tracked vehicles. The damping system comprises a cylinder fluidly connected to a reservoir. Damping ratio is varied by varying a flow circulating area between the cylinder and the reservoir.

A shock absorber system can includes a shock tube and a piston slidably mated to an end of the shock tube. The system can include a heat sink reservoir. The heat sink reservoir can be connected to the shock tube via a valved fluid connection. The valved fluid connection can limit or permit fluid flow from the shock tube to the heat sink reservoir depending on fluid velocity and/or pressure.

A shock absorber including: a first passage (101) allowing working fluid to flow out from one chamber (19) as a result of movement of a piston (18); a second passage (181) provided in parallel with the first passage; a damping force generating mechanism (41) provided in the first passage, and configured to generate a damping force; a tubular case member (140) including at least a part of the second passage formed therein; an annular disc (134) supported on an inner peripheral side or an outer peripheral side in the case member. An annular seal member (156) configured to seal a gap to the case member is provided on a non-supported side of the annular disc. The shock absorber further includes two chambers (171, 172) in the case member, which are defined and provided by the disc. The disc is configured to block flow to the second passage.

The hydraulic damper 1 includes: a cylinder 11 storing oil; a piston unit connected to a rod moving in an axial direction and configured to move within the cylinder 11; an outer cylinder body 12 outside of the cylinder 11 and forming a communication path L through which oil flows along with movement of the piston unit; a damper case 13 outside of the cylinder 11 and forming a reservoir chamber R to retain oil; a damping force changer 52 external to the cylinder 11 and configured to generate a damping force by throttling flow of oil along with movement of the piston unit and configured to change magnitude of the damping force; and a joint piece 61 forming a channel 61R of oil from the communication path L to the damping force changer 52 and including an external valve to control flow of oil flowing through the channel 61R.

A control apparatus for a suspension apparatus, includes: a vehicle speed acquiring section which acquires a vehicle speed as a speed of a vehicle; an acquisition section which acquires a stroke velocity of the suspension apparatus; a contribution ratio determining section which determines a contribution ratio between a first parameter and a second parameter based on the vehicle speed, the first parameter serving for controlling a damping force in a first speed region of the vehicle, the second parameter serving for controlling the damping force in a second speed region which is a speed region higher in speed than the first speed region; a change amount restricting section which restricts a change amount of the contribution ratio; and a damping force controlling section which controls the damping force of the suspension apparatus based on the restricted contribution ratio and the stroke velocity.

A position-sensitive shock absorber 1 comprising an internal fluid space 3, a piston 5 and fluid system 7. The piston divides the internal fluid space into a compression side 3a and a rebound side 3b. The fluid system fluidly connects the compression side to the rebound side. The fluid system comprises a chain 9 of three or more external fluid spaces 9a, 9b, 9c, 9d external to the internal fluid space, space flow-control-arrangements 27i, 27ii, 27iii, and passage arrangements 25a, 25b, 25c, 25d mutually spaced along the internal fluid space. Each of the space flow-control-arrangements is configured to mutually fluidly connect a respective adjacent two of the external fluid spaces. Each of the external fluid spaces has a respective one of the passage arrangements. Each of the passage arrangements comprises one or more passages opening to the internal fluid space. The piston is movable along the internal fluid space to at least one of pass (at least one of the passages) and at least restrict flow through at least one of the passages.

A vibration damper for a motor vehicle with a hydraulic unit and at least one valve for controlling the volume flow to the hydraulic unit, wherein the at least one valve and the hydraulic unit are arranged outside of the tube elements of the vibration damper and a motor vehicle including such vibration damper.

It is an object of the present invention to suitably estimate a state of a vehicle. A vehicle state estimation section (1200) includes: a main computation section (1210) configured to carry out linear computation with respect to a state amount related to a state of a vehicle; and a tire model computation section (1240) configured to carry out nonlinear computation with direct or indirect reference to at least part of a result of the linear computation carried out by the main computation section (1210).