The hydraulic stop member comprises: a cup-shaped body mounted in a compression chamber of the shock-absorber. A piston is mounted at an end of a rod of the shock-absorber so as to slide in the cup-shaped body when the shock-absorber is close to an end-of-travel position of the compression stroke. The cup-shaped body includes a side wall and a bottom wall which define, along with the piston, a working chamber where a damping fluid of the shock-absorber is compressed by the piston. A bypass conduit connects a working chamber with the portion of the compression chamber placed above a seal ring. A pressure relief valve keeps the bypass conduit closed as long as the pressure in the working chamber remains below a given threshold value and to open the bypass conduit, thereby allowing the discharge of the damping fluid from the working chamber to the compression chamber through the bypass conduit, when the pressure in the working chamber exceeds the threshold value.

Disclosed herein is a hydraulic damper comprising a damper body comprising a chamber, a shaft telescopically engaged with the damper body, and a piston slidably disposed with the damper body and coupled to a first end of the shaft, the piston comprising an orifice for fluidly connecting the chamber to an interior of the shaft, wherein the orifice comprises a first flow inlet having a first edge profile and a second flow inlet having a second edge profile such that fluid flowing through the orifice from the first flow inlet toward the second flow inlet exhibits a different pressure drop than fluid flowing through the orifice from the second flow inlet to the first flow inlet.

A shock absorber is provided. The shock absorber of the present invention includes a shock absorber main body, a damping passage, a primary damping force generation component, and a secondary damping force generation component. The shock absorber main body has an outer tube and a rod and is stretchable. The damping passage communicates operating chambers with each other provided in the shock absorber main body. The primary and secondary damping force generation components are provided in series with the damping passage. The secondary damping force generation component includes a secondary valve, an annular facing portion, and a valve stopper. The annular facing portion faces the secondary valve with an annular gap between the annular facing portion and the secondary valve. The valve stopper has elasticity to allow bending, and when the secondary valve bends and comes in contact with the valve stopper, restricts the secondary valve from bending.

A damping system is provided including at least one fluid damper including a damping volume containing a damping fluid, and a fluid reservoir including a reservoir piston partitioning an inner volume of the fluid reservoir into a damping chamber containing the damping fluid and a recoil chamber containing a recoil fluid. The damping volume of the at least one fluid damper is connected to the damping chamber of the fluid reservoir in a fluid-conducting manner. The reservoir piston is movable in a compression direction increasing a volume of the damping chamber and decreasing a volume of the recoil chamber. The reservoir piston is movable in a dilatation direction decreasing the volume of the damping chamber and increasing the volume of the recoil chamber. The reservoir piston includes a damping chamber surface facing the damping chamber and a recoil chamber surface facing the recoil chamber.

Systems and methods for reducing inertial forces of a reciprocating piston internal combustion engine are described. The systems and methods may provide for counterweights in a form of pistons in cylinders that are moved via electromagnets. The counterweights may be moved at a frequency that corresponds to engine speed via an alternating current.

A floating piston for a single-tube shock absorber is arranged slidably inside a tubular sleeve of the shock absorber so as to separate a sliding chamber and a blind chamber. The piston includes an annular support frame formed of a metallic material and having a central hole, a dynamic-lip seal which is radially external to the frame and arranged in sliding contact with the sleeve of the shock absorber so as to define a radial seal external to the frame, and a central flexible membrane arranged to hermetically close the central hole and deformable so as to anticipate the complete movement of the floating piston. The dynamic-lip seal and the flexible membrane are made of two elastomeric materials which are different from each other, the elastomeric material of the membrane being more flexible and elastic than the elastomeric material of the dynamic-lip seal.

A magnetorheological (MR) damper includes: a main tube defining an MR chamber containing an MR fluid having a viscosity that varies in response to application of a magnetic field. A piston rod is disposed at least partially within the main tube. An MR piston is connected to the piston rod and divides the MR chamber into an MR rebound chamber and an MR compression chamber. The MR piston includes an MR rebound valve that regulates a flow of the MR fluid from the MR rebound chamber into the MR compression chamber during a rebound stroke, thereby generating a rebound damping force. A base valve assembly regulates flow of a standard fluid. The rebound damping force is generated substantially entirely by the MR rebound valve of the MR piston. A compression damping force is generated by an MR compression valve of the MR piston together with the base valve assembly.

A damping device includes a cylinder having a damping fluid, and a piston to be actuated via a piston rod and movable through the damping fluid during a damping stroke. A flow channel allows the damping fluid to pass through the piston during the damping stroke. A control piston is mounted in/on the piston to be movable, and a cross section of the flow channel is changeable by a movement of the control piston relative to the piston. A force accumulator can move the control piston relative to the piston with a return force counteracting a flow force exerted by the damping fluid on the control piston during the damping stroke. A control aperture allows a pressure drop proportional to the flow force and the speed of the piston to occur, and a target speed for the piston is dependent on a position of the piston relative to the cylinder.

A kinetic seat assembly includes a primary seat cushion frame, a secondary seat cushion frame movable relative to the primary seat cushion frame, a primary seat back frame, a secondary seat back frame movable relative to the primary seat back frame, a pair of lateral dampers extending between the primary seat back frame and the secondary seat back frame, a pair of vertical dampers extending between the secondary seat back frame and the primary seat cushion frame, a pair of fluid reservoirs for providing a fluid into the pair of lateral dampers and the pair of vertical dampers, and an electronic control unit configured to control the rate at which the fluid is provided to and drawn out of each of the dampers to control a damping effect. In embodiments, an end of the lateral dampers is permitted to move freely relative to the secondary seat back frame.

A vibration damper for a motor vehicle comprises a damper tube and a working piston which is arranged axially movably within the damper tube and divides the interior space of the damper tube into a working space on the piston rod side and a working space remote from the piston rod, wherein the working piston comprises a main piston, a first additional piston and a second additional piston, wherein the additional pistons each comprise an additional valve device, and wherein the additional pistons are connected fluidically to one another via a flow channel.