The damper and spring unit comprises a damper, a spring member extending coaxially to the damper, a bottom spring plate and a vehicle height adjustment device for adjusting the height of the vehicle from the ground. A first damper element is connected to a wheel carrier of the suspension and a second damper element is slidable relative to the first damper element along the longitudinal axis (z). The adjustment device is interposed between the first damper element and the spring member to change the linear position of the bottom spring plate, and a bottom end of the spring member, relative to the first damper element. A hydraulic linear actuator comprising a cylinder is secured to the first damper element and a piston drivingly connected for translation with the bottom spring plate along the longitudinal axis (z) of the damper between a bottom end-of-travel position and a top end-of-travel position.

A damper with a cylinder and a rod, a spring arranged around the damper and a linear actuator arranged to change in a controlled manner the axial position of a bottom end of the spring relative to the cylinder of the damper. The actuator comprises an inner cylindrical element arranged to be mounted around the cylinder of the damper, an outer cylindrical element, which is mounted so as to be axially slidable relative to the inner cylindrical element and is arranged to support the bottom end of the spring, and a working chamber arranged to be filled with a fluid under pressure to adjust the axial position of the outer cylindrical element relative to the inner cylindrical element. The working chamber is delimited, both radially and axially, only by the inner cylindrical element and by the outer cylindrical element. The outer cylindrical element is provided with a support flange arranged to support the bottom end of the spring.

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 vehicle lowering system having a cargo surface with an adjacent pivoting arm is connected to a vehicle at a pivot point. The pivoting arm moves between a raised and a lowered position by an actuator that is affixed to a frame and the pivoting arm. The frame has an upper portion and a lower portion that provides structure for the portion of the frame that is beyond the pivot point and actuator. The pivot arm has a spindle that holds and allows a wheel to rotate. The spindle has an axis that is always located above the cargo surface. The actuator is movable between an extended position and a retracted position. When the actuator moves between the extended and retracted position, the pivoting arm moves the vehicle between a raised and a lowered position.

A hydraulic level-adjustment device has a reservoir, a reversible hydraulic unit with a hydraulic pump, and a single-acting hydraulic linear actuator. To lift a vehicle chassis, the working space of the linear actuator can be pressurized by the hydraulic pump operated in its first pumping direction via its first pump connection and a fill line with a fill-check valve arranged therein. To lower the chassis, via its second pump connection, the hydraulic pump, operated in the reverse pumping direction, pumps hydraulic fluid into the reservoir via an outflow line with a throttle unit arranged therein. The pressure present upstream of the throttle unit acts on the control connection of a lockable, drainage-check valve via a control line and opens same, so that, under the weight of the motor vehicle, hydraulic fluid is forced out of the working space of the hydraulic linear actuator into the reservoir via the drainage line.

Disclosed embodiments are related to suspension systems including dampers and suspension actuators and related methods of control for mitigating the effects of potholes and other road surface discontinuities.

A bearing spring/damper system of a vehicle wheel has a hydraulic vibration damper consisting of a damper cylinder and a damper piston guided therein, the piston rod of which hydraulic vibration damper is fastened to the vehicle body, whilst the damper cylinder is supported to a wheel guiding element. A pretension spring is clamped functionally between the damper piston and a pretension piston which can be displaced hydraulically in the longitudinal direction of the piston rod. The pretension piston is supported hydraulically with respect to the damper cylinder by a support chamber filled with the hydraulic medium of the vibration damper, and can be displaced by a conveying device, which conveys hydraulic medium into or out of the support chamber. The pretension spring is parallel-connected in every possible position of the pretension piston of a bearing spring ultimately clamped between the vehicle body and the wheel for force transmission.

The fluid supply device comprises a screw, which has a male thread formed thereon and rotates, and a nut, which has a female thread formed therein that meshes with the male threading and which, by the screw rotating in a first direction, i.e., the circumferential direction, moves towards a first end in the rotation axis direction, and which, by moving with said movement a piston that forms a reservoir chamber, discharges a fluid stored in the reservoir chamber, wherein, if the fluid is discharged and if the screw is not rotating, first surfaces which form the threading of the male screw and second surfaces which form the threading of the female screw are in contact with each other, and second surfaces which form the threading of the male screw and first surfaces which form the threading of the female screw are not in contact with each other.

ThE load weight derivation device comprises a calculation unit that calculates a contraction amount of a spring in a suspension positioned between a vehicle body and a vehicle wheel, and a derivation unit that derives the weight loaded on the vehicle body using the contraction amount calculated by the calculation unit.

A shock assembly is disclosed. The assembly includes a damper chamber having an outer wall with a first inner diameter (ID). A secondary chamber within the damper chamber, the secondary chamber comprising an exterior wall with an external diameter (ED) less than the ID of the outer wall to form an annular region therebetween. A damping piston coupled to a piston rod, the damping piston disposed in the secondary chamber and axially movable relative to the secondary chamber, the damping piston to bifurcate the secondary chamber into a compression side and a rebound side. A valve to control a flow of a working fluid between the annular region and the secondary chamber.