A vehicle height adjustment device includes a rear suspension, an electromagnetic valve control unit, and a weight estimation unit. The rear suspension includes a support member. The electromagnetic valve control unit determines a target movement based on an interrelation between the target movement and a weight applied to a vehicle, under which the target movement is set to an upper limit when the weight is larger than a predetermined weight, so that an actual movement of the support member reaches the target movement. The electromagnetic valve control unit determines the target movement based on a temporary weight. The weight estimation unit increases the temporary weight, even when the actual movement reached the target movement. The electromagnetic valve control unit decreases the target length, even when the temporary weight increased. The weight estimation unit estimates as the weight the temporary weight when the actual length has finally reached the target length.

A hydraulic shock absorber includes a control valve. The control valve includes a valve seat formed with a closing face, a valve body configured to come into contact with the closing face, and a valve shaft configured to transmit an operation force applied from a driving unit to the valve body. The control valve is defined with an upstream side flow channel extending from an inlet coupled to the upper end opening, via a space in which the valve body moves, to the closing face, and a downstream side flow channel extending from the closing face to an outlet. The control valve is disposed above the cylinder so that a central axis of the valve shaft is inclined relative to a central axis of the vehicle body side tube and the wheel side tube.

A hydraulic shock absorber includes a control valve. The control valve includes a valve seat formed with a closing face, a valve body configured to come into contact with the closing face, and a valve shaft configured to transmit an operation force applied from a driving unit to the valve body. The control valve is defined with an upstream side flow channel extending from an inlet coupled to the upper end opening, via a space in which the valve body moves, to the closing face, and a downstream side flow channel extending from the closing face to an outlet. The control valve is disposed above the cylinder so that a central axis of the valve shaft is inclined relative to a central axis of the vehicle body side tube and the wheel side tube.

In one embodiment, a gas spring having a travel control includes positive and negative chambers and a valve mechanism that controls the fluid communication between the chambers. The valve mechanism includes a valve bore that while only moving a small amount, allows for large changes in gas spring travel length.

According to the present invention, there is disclosed a torque impact mitigator including a hydraulic cylinder having a compression end and a rebound end. A piston rod mounted to the piston and extends out from the hydraulic cylinder through the first end cap. A compression spring is compressed when the piston rod is moved out of the hydraulic cylinder and in a relaxed state when the piston rod is moved towards a second end cap. Bores through the piston allow the passage of hydraulic fluid from the rebound end to the compression end of the cylinder. A relief valve is secured to the piston within the rebound end to momentarily reduce the pressure of the hydraulic fluid caused by an instantaneous hydraulic pressure increase due to the initial movement of the piston from the rebound end to the compression end.

A damping device with a fixing structure includes a housing and a valve stem which extends through the housing. The inner housing plate is disposed in the housing, and the inner housing plate separates a space in the housing to be a first housing chamber and a second housing chamber which are independent and communicated with each other. An end of the valve stem is in sliding and sealing fit with the first housing chamber, and the valve stem separates the first housing chamber to be two independent sub-chambers with variable volumes. A plunger rod is directly or indirectly slidably sealed on the plug hole. The powerhead assembly is configured to drive the plunger rod to move. The housing is separated to be two chambers The plunger rod is moved to communicate or block the damping liquid, which realizes two functions of damping and supporting.

A pneumatically operable adjusting device (1) is provided for acting on a spring device (5) of a spring damper device (3) having a tubular body (2), with a tubular piece-shaped housing (4) which is designed to surround the tubular body (2) and has a passage (6) passing through a peripheral wall of the housing (4), and the adjusting device (1) has an adjusting nut (9) with an internal thread (10) which is attached to an external thread (11) of a tubular body (2), 37) of the spring damper device (3) can be brought into screw engagement, the housing (4) being designed for releasable abutment against the adjusting nut (9) and having an inner recess (7) for forming a pressure chamber (8) which is in fluid connection with the passage (6) and the inner recess (7) forming a pressure wall (24), the fluid admission of which causes a force acting on the housing (4) in the axial longitudinal direction and the housing (4) has an abutment surface (54) designed for spring force admission by the spring device.

A flow path control device includes: an on-off valve for opening or closing a flow path through which fluid flows from a first chamber to a second chamber; a control valve which controls the opening and closing of the on-off valve by transiting between a first state and a second state; and a push rod which includes a rod-shaped portion of which one end is pressed and moved to the other side and the other end causes the control valve to transition from the first state to the second state and a protruding portion which protrudes radially outward of the rod-shaped portion from an outer peripheral surface of the rod-shaped portion so as to receive pressure of fluid flowing from the first chamber to the second chamber.

A flow path control device includes: an on-off valve for opening or closing a flow path through which fluid flows from a first chamber to a second chamber; a control valve which controls the opening and closing of the on-off valve by transiting between a first state and a second state; and a push rod which includes a rod-shaped portion of which one end is pressed and moved to the other side and the other end causes the control valve to transition from the first state to the second state and a protruding portion which protrudes radially outward of the rod-shaped portion from an outer peripheral surface of the rod-shaped portion so as to receive pressure of fluid flowing from the first chamber to the second chamber.

A vehicle suspension system comprising a hydropneumatic strut comprising a fluid interface, where supply of hydraulic fluid to the strut via the fluid interface causes the overall length of the strut to increase, and withdrawal of hydraulic fluid via the fluid interface causes the overall length of the strut to decrease, a first displacement system in fluid communication with the fluid interface, capable of supplying and withdrawing fluid to and from the strut as well as measuring the volume of fluid supplied or withdrawn from the strut, a second displacement system in fluid communication with the fluid interface, and a hydraulic fluid source for selectively supplying or withdrawing hydraulic fluid from the hydropneumatic strut via either of the first or second displacement systems.