Abstract: A bicycle suspension assembly including a damper body and having a valve, including a moveable inertia mass, movable between first and second positions to selectively alter the compression damping rate of the bicycle suspension assembly is described. The valve and especially the inertia mass can be substantially isolated from the effects of the rebound and compression fluid flows.

Abstract: A damper, in particular for motor vehicle, includes a cylinder containing a hydraulic fluid, a main piston (1) actuated by a rod (3) defining in the cylinder a first chamber (2a) and a second chamber (2), the second chamber containing the rod, a hydraulic fluid reservoir (6) and a valve (10) placed in the hydraulic fluid flow between the first chamber and the second chamber, the valve including a mobile check valve (28) co-operating with a seat (30) and elements designed to press the check valve on its seat. The damper further includes filtering elements mounted (16) in parallel with the valve (10), adapted to generate a filtering control pressure acting on the check valve, the control pressure depending on the pressure differential at the inlet and the outlet of the valve.

Abstract: Shock absorber components, such as a radial bypass damper, an anti-cavitation valve (ACV) and an incremental flow metering valve IFMV. The damper is of a continuous, unitary construction with a main hole and auxiliary holes interconnected by passageways. The ACV has openings that angle obliquely relative to entry surfaces of valving shims and extend at an incline continuously through the valving shims. The metering valve linearly regulates flow, substantially independent of piston displacement.

Abstract: Vibration damper includes a cylinder filled with a damping medium in which a piston rod with a piston is guided in an axially movable manner, wherein the piston divides the cylinder into a work space on the piston rod side and a work space remote of the piston rod. A bypass connects at least one of the two work spaces with a first work chamber in a housing in which an axially movable separating piston separates the first work chamber from a second work chamber, the bypass being controlled by a switchable valve.

Abstract: A damper includes housing bounding a chamber. A barrier is movably disposed within the chamber so as to divide at least a portion of the chamber into a pressure compartment and a control compartment each having a volume, the volume of the pressure compartment and the control compartment each being adjustable based on movement of the barrier. A first compressible gas is disposed within the pressure compartment while a first hydraulic fluid is disposed within the control compartment A piston shaft has a first end slidably disposed within the control compartment. A temperature compensator disposed within the chamber automatically adjusts the combined volume of the pressure compartment and the control compartment based on the temperature of the first hydraulic fluid within the control compartment so as to regulate the pressure within the control compartment.

Abstract: A piston is guided with freedom of axial movement in a damping medium-filled pressure tube, the piston dividing the pressure tube into a working space on the piston rod side of the piston and a working space on the side away from the piston rod. The medium can flow in either direction through a fluid connection between the two working spaces of the pressure tube, in which connection an adjustable damping valve for the incoming flow is provided for when the piston rod is traveling inward. The outgoing flow side of the valve is connected at least to the working space on the piston rod side of the piston and a compensating space. The adjustable damping valve can be controlled by way of a sidestream inside the fluid connection between the working space on the side away from the piston rod and the working space on the piston rod side of the piston, the adjustable damping valve having a sidestream channel leading to the compensating space.

Abstract: A suspension damper includes a housing bounding a main chamber. A piston rod is slideably disposed within the main chamber of the housing. A main piston is mounted on the first end of the piston rod within the main chamber of the housing so as to slideably engage against the housing in sealed engagement, the main piston having a first side and an opposing second side with a compression port extending therebetween. A control valve assembly is disposed within the main chamber and bounds a sealed valve compartment. The control valve assembly is movable between a first position wherein the valve compartment is compressed to a first volume and a second position wherein the valve compartment is expanded to an enlarged second volume, the control valve assembly being movable under pressure so as to provide variable compression damping properties.

Abstract: A magnetorheological damper system comprising a reservoir in communication with a damper. The damper comprises a damper cylinder defining a damper chamber, wherein the damper chamber contains a magnetorheological fluid and a movable damper piston. The damper piston comprises at least two coil windings on the outer surface of the damper piston, wherein the damper piston is capable of generating a magnetic field between the damper piston and a wall of the damper cylinder. The reservoir comprises a reservoir cylinder defining a passageway, wherein the reservoir includes a magnetorheological electromagnet capable of generating a magnetic field between the magnetorheological piston and a wall of the passageway. The combination of the an MR reservoir and MR damper leads to a damping system capable of damping a wide range of extreme forces.

Abstract: A damper assembly includes a reservoir chamber for supplying hydraulic fluid to a main damper chamber. The reservoir chamber is in fluid communication with damper chamber through an internal fluid passage formed by openings in the damper housing and the reservoir housing. Mating features align the reservoir and damper housing relative to each other.

Abstract: A flow regulator for a gas shock absorber is connected between the primary cylinder and the secondary cylinder. The flow regulator allows a user to adjust the rate of flow of fluid from the primary cylinder to the secondary cylinder thereby varying the damping properties of the shock absorber. The adjustment is effected by rotating one of a plurality of orifices of different sizes into the fluid flow path.

Abstract: A suspension damper comprises a cylinder tube and a control partition. The cylinder tube is disposed within a reservoir tube to define a fluid reservoir, and has at least one first hole. The control partition is disposed in the fluid reservoir, and communicates with the at least one hole.

Abstract: A shock absorber comprises first and second axially aligned cylinders (11, 21) each having a liquid filled piston chamber (12, 22), an axially displaceable piston (13, 23) received in the piston chamber (12,22), and means (14, 24) for dampening axial displacement of the piston (13,23) through the liquid in the piston chamber (12, 22). A piston rod (1) axially extends between and into the first and second cylinder piston chambers (12, 22). The first and second axial ends (1a , 1b) of the piston rod (1) are connected to the first and second cylinder pistons (13, 23) respectively.

Abstract: A shock absorber includes a gas compartment within its reservoir compartment. The gas compartment contains gas at a pressure beyond atmospheric pressure. The gas compartment may be defined by an elastomeric bladder which separates the fluid and gas in the shock from one another, and prevents the fluid from becoming aerated during operation of the shock. Because the shock absorber is pressurized beyond atmospheric pressure, the shock absorber provides a “spring assist” to the main suspension spring. The bladder acts as diaphragm and pressure in the bladder is directly transmitted to the fluid. As the main chamber of the shock absorber is replenished with fluid from the reservoir chamber, the gap in the reservoir chamber is taken up by the ever-expanding bladder, and no cavitation occurs in another embodiment, the bladder is replaced by a member mounted for reciprocal sealing movement within the reservoir compartment.

Abstract: A damper assembly includes a damper chamber and a remote reservoir chamber. The remote reservoir chamber includes a floating piston. The floating piston moves within a reservoir cavity to accommodate the additional fluid volume from a shaft during the compression strokes. The floating piston separates a fluid chamber which receives a hydraulic fluid from the damping chamber and a compressible fluid chamber which contains a compressible fluid. The compressible fluid provides a much higher compression ratio than conventional gas chambers and thereby operates as a bias to compress the fluid chamber and operate as a spring.

Abstract: A traction/compression buffer for coupling devices on rail and wheel-mounted vehicles comprises a housing (1) and a piston element (3), which projects out of said housing on one side and which can be moved out of a zero position in two directions against the resistance of a spring device and a damping device. A hydraulic damping device is provided for damping the return movement of the piston element (3) out of the position in which it is drawn out of the housing (1) in the direction of the zero position. Said hydraulic damping device comprises a ring-shaped hydraulic working chamber (32) that surrounds the piston element (3) and that is connected to an overflow chamber (29) by at least one overflow channel (31).

Abstract: A shock absorber includes a pressure tube with a piston slidably disposed therein. A separate valve includes a fluid circuit for fluid low in rebound and a fluid circuit for fluid flow in compression. Each fluid circuit includes a variable orifice which allows selection between a firm rebound with a soft compression, a soft rebound with a soft compression, and a soft rebound with a firm compression. Each variable orifice is in communication with a blowoff valve in such a manner that they provide a variable blowoff feature to the blowoff valves.

Abstract: A piston is guided with freedom of axial movement in a damping medium-filled pressure tube, the piston dividing the pressure tube into a working space on the piston rod side of the piston and a working space on the side away from the piston rod. The medium can flow in either direction through a fluid connection between the two working spaces of the pressure tube, in which connection an adjustable damping valve for the incoming flow is provided for when the piston rod is traveling inward. The outgoing flow side of the valve is connected at least to the working space on the piston rod side of the piston and a compensating space. The adjustable damping valve can be controlled by way of a sidestream inside the fluid connection between the working space on the side away from the piston rod and the working space on the piston rod side of the piston, the adjustable damping valve having a sidestream channel leading to the compensating space.

Abstract: In a combined spring and shock absorber system for a wheel suspension of a vehicle comprising tubular rolling bellows arranged between a wheel-support structure and a vehicle body the bellows includes a space filled with a fluid in communication with a hydraulic accumulator. The bellows space is also in communication with at least one additional hydraulic accumulator via a throttle passage and via at least one pre-set differential pressure-control valve ensuring that threshold values for the internal pressure in the tubular rolling bellows are not exceeded in the event of high spring-extension and/or spring-compression speeds.

Abstract: Rotation damper (1), for a vehicle that runs on rails, having piston (9) and cylinder parts (2) moving with respect to one another. This damper has a friction characteristics, that is to say the fluid connection over the piston is not a permanently open hole but exclusively comprises spring-loaded valves (11). In order to facilitate the installation of such dampers, it is proposed to make a separate connection between the working cylinder and the reservoir in which a valve that can be manually operated is arranged, which valve, on operation, opens a connection as a result of which the piston and cylinder can be moved relative to one another under manual force.

Abstract: A shock strut for supporting and dampening a load with a two-phase dampening characteristic. The shock strut includes an inner cylinder slidably mounted within an outer cylinder, each of the cylinders having slidably mounted therein a piston. A first one of the pistons in the outer cylinder defines a first gas chamber, a second one of the pistons in the inner cylinder defines a second gas chamber. Between the cylinders is a metering device that defines a third and fourth fluid chambers. At full extension of the shock strut, a first stage of dampening is provided as the first gas chamber is compressed by fluid flowing through the metering device into the third chamber from the fourth chamber. As the shock strut is compressed, a second stage of dampening is provided by fluid flowing through the metering device into the fourth chamber and compressing the second gas chamber.

Abstract: Impact damper as a connecting member between a bumper and a chassis of a motor vehicle for the purpose of damping the shock loading during a collision between this motor vehicle and an obstacle, predominantly through gas-spring forces and deformation work. This impact damper includes an inner tube and an outer tube, which can be displaced telescopically one inside the other, thereby changing the volume of pressurized first and second gas spaces, at least one of the gas spaces being connected to an accumulator by a pneumatic feed line. An electrically controllable control valve, by means of which the air pressure in the gas spaces can be changed, can be arranged in the pneumatic feed line. The pressure in the gas spaces can be varied by a detection sensor system in the motor vehicle, which controls a control valve and adapts the pressure to the expected momentum of the collision. It is possible for a deformation element to be displaced as well to absorb a high impact energy by deformation work.

Abstract: The gas-hydraulic shock absorber assembly comprises a sleeve member and a ram member movable relative to the sleeve member. In the interior of the ram member, a gas chamber is provided that is pressurized by means of a gas. In the interior of the sleeve member, an oil chamber is provided that is filled with a hydraulic medium and which decreases in volume the more the ram member is moved relative to the sleeve member. Between the two chambers, a gas-hydraulic control assembly is provided. Upstream of the control assembly, there is a bleeding assembly, comprising a transfer channel opening into a portion of the oil chamber remote from the control assembly. Further provided is a bleeding channel, opening into an upper portion of the oil chamber and connecting the transfer channel to the control assembly when the shock absorber assembly is at rest. The bleeding assembly comprises several channels connecting the oil chamber to the control assembly and comprising each a V-shaped valve flap to close the channels.

Abstract: A bushing having a variable and controllable hardness, and a method of restricting movement comprising using such bushing.

Abstract: An automatic shoe clearance adjustment apparatus having a ratchet wheel 124b and a driving member 127 comprising a pawl section 127f making a ratchet engagement with the ratchet wheel 124b and an arcuate leaf spring section 127e developing a resilient force for adjusting the automatic shoe clearance adjustment apparatus. The leaf spring section 127e is made of bi-metal. When the temperature of the leaf spring section 127e exceeds the predetermined degree, the arcuate leaf spring section 127e thermo-deflects so as to weaken the resilient force, thereby the automatic shoe clearance adjusting operation is suspended.

Abstract: An adjustable shock absorber is provided that includes a body having a fluid passageway with first and second passages in fluid communication with one another. A valve assembly is arranged between the passages and includes a plunger that is adjustable between a plurality of positions corresponding to a plurality of fluid flow positions. The valve assembly includes a metering valve having a orifice in a disc, and the plunger includes a needle with a portion disposed in said orifice to provide flow area. The flow area is changed when the plunger moves. The valve assembly also includes a blow-off valve in which the disc is biased to a closed position by a spring arranged between the plunger and the disc. Movement of the plunger changes the loading on the spring. An adjustment knob has a cammed surface that cooperates with the plunger so that as the adjustment knob is rotated the cammed surface moves the plunger.

Abstract: A shock-isolation structure for supporting a relatively light load on a supporting surface and having a plurality of spring units operable in both tension and compression oriented in a truss configuration with first ends of said spring units connected to the supporting surface for universal movement and with second ends of said spring units connected to the load for universal movement, with each of the spring units including a coil spring, an end cap, and a rod which extends outwardly through the end cap with a clearance fit in a nonextended position, a clevis body on the end of each of the rods, a groove in each of the end caps, and a ridge on each of the clevis bodies for mating engagement when the rod is in the nonextended position to thereby center each of the rods in each of the end caps.

Abstract: A vibration control system for a structure having a first structural member and a second structural member. The vibration control system having a liquid spring operably interposed between the first structural member and the second structural member. The liquid spring uses a compressible liquid to generate spring forces in response to relative displacement between the first structural member and the second structural member. A second volume of compressible liquid in a second chamber is removably connected to the liquid spring by a fluid passage. A valve is coupled to the fluid passage. The valve is selectively operable to place the second volume in communication with the liquid spring. A controller is electrically coupled to the valve. The controller emits a control signal to control the valve. The control signal is determined by a combination of at least a first component to alter the stiffness of the liquid spring and a second component to alter the damping of the liquid spring.

Abstract: A pressure medium cylinder with a piston rod (1) extending out on one side has a cylinder floor (3), which closes off the cylinder tube (2) on the piston side with a fastening element (4), and a function block (5), placed upon the former, with function elements (6 to 9). In order to improve the connection between cylinder floor (3) and function block (5), the cylinder floor (3) has at least one cylindrical outer connection area (17) into which the pressure medium lines (19, 20) that lead to the work chambers (11, 18) open to the outside and onto which the function block (5) is placed and attached with a sealed through-hole (21), into which the pressure medium lines of the function elements (5 to 9) open.

Abstract: In an air-type shock absorber, a piston is sealing situated in a cylinder chamber. A vacuum state occurs in a piston bearing side of the cylinder chamber when a piston is pushed. Also, an air reservoir is provided at a side opposite to the piston bearing to have a sealed structure, so that a force of absorbing a shock can be increased to have the same effect as in an oil-type shock absorber. The shock absorber can be used not only at a place requiring cleanness but also in adverse environment in which the shock absorber is exposed to water or coolant, and durability of the shock absorber is also improved.

Abstract: A hydraulic shock absorber comprises a cylinder (11) with an expandable and contractible piston rod (12), an outer casing (13) disposed on the outside of the cylinder (11), and a reservoir (16) defined between the outer casing and the cylinder. Due to an elastically deformable bladder (14) disposed inside the reservoir, a gas chamber (17) in which gas is sealed is formed between the bladder and the outer casing, and a reservoir chamber (18) communicated with the inside of the cylinder and designed for guiding hydraulic fluid is formed between the bladder and the cylinder. Furthermore, a gas sealing valve (23) for opening and closing a flow conduit (24) communicated with the gas chamber provided to part of the outer casing is provided to a bottom portion (19) of the outer casing, and allowing gas to enter and exit the gas chamber via the gas sealing valve makes it possible to freely adjust the gas pressure in the hydraulic shock absorber from the outside.

Abstract: A force absorption device is proposed which serves for receiving and diverting forces in bridge constructions in particular. Said device includes a housing (2) with at least one hydraulic liquid chamber (5). In said hydraulic liquid chamber (5) a movable hydraulic piston (3) is supported which is guided by a piston rod (4). In this manner forces acting on said hydraulic piston (3) are transmitted to said hydraulic liquid. In addition at least one compensation chamber (11) connected to said hydraulic liquid chamber (5) and filled with hydraulic liquid is provided for, which chamber can be changed in its volume in dependence on the density of said hydraulic liquid. Therein, said piston rod (4) at least partly is build in hollow shape for forming said compensation chamber (11) in the interior of said housing (2) and/or in said piston rod (4).

Abstract: The invention relates to a shock absorber having high dissipating power and comprising a rod-and-piston assembly (12) slidably received in a cylinder (11) and defining on either side of the piston (13) respective working chambers (18; 19) containing hydraulic fluid. In the invention, each working chamber (18, 19) communicates continuously with an associated chamber (20, 21) containing a heterogeneous energy absorption-dissipation structure constituted by a capillo-porous matrix (51, 61) and an associated liquid (52, 62) relative to which the matrix is lyophobic. In addition, each working chamber (18, 19) communicates with a common compensation chamber (30) via an associated valve system (32, 33) including non-return means (40, 41) ensuring that the working chamber concerned closes automatically during compression, and opens during expansion.

Abstract: A shock absorber is made with a bleed function and preferably a non-return valve function associated with the bleed function. The shock absorber has a cylinder (3) and, working in the latter in working medium and arranged on a piston rod (4), a piston arrangement. The latter comprises at least two first and second pistons (5, 6) arranged at a distance from one another on the piston rod. At least one piston (5) can, in connection with an end position, be introduced into a first space so as, depending on its position in or at the space, to bring about a modified or varied damping force relative to when the piston is located outside the space. The piston rod (4) is provided with an inner second space (15) which is arranged so as to contain said bleed and/or non-return valve function. Additionally or alternatively, the piston (6) working outside the first space is provided with a member performing a bleed function and with any associated non-return valve function.

Abstract: A free piston defines a gas chamber in a cylinder, an interior of which is divided into a rod-side chamber and a bottom-side chamber by a piston. An accumulator having a gas chamber is connected to the rod-side chamber by a first oil line, midway of which is provided a damping-force generating unit. Also, the bottom-side chamber and the first oil line are communicated to each other by a communication line, midway of which is provided a spring-constant switchover valve for communication and shut-off of the communication line. Accordingly, when the spring-constant switchover valve puts the communication line in communication, the two gas chambers are compressed to make a spring constant small, thereby making comfort in a vehicle favorable. Meanwhile, the spring-constant switchover valve shuts off the communication line, only one of the gas chambers is compressed to make the spring constant large, thereby limiting a contracting displacement of a piston rod and suppressing rolling of the vehicle.

Abstract: A hydraulic circuit controls a doubling acting cylinder of a vehicle suspension to provide load leveling and shock absorption functions. A set of solenoid valves control the application of pressurized hydraulic fluid from a supply line to the cylinder and from the cylinder to a tank return line to raise and lower the vehicle for load leveling. The chambers of the cylinder are interconnected by a parallel arrangement of a check valve, orifice and a relief valve. Another parallel arrangement of a check valve, orifice and a relief valve couples the cylinder to an accumulator. These parallel arranged components enable the doubling acting cylinder to function as a passive shock absorber. A lock-out valve is provided in the preferred embodiment a to defeat the shock absorber operation and provide a very stiff suspension.

Abstract: A springing system for a vehicle has a hydraulic actuator and a storage element which holds hydraulic fluid. The system is constructed as a gas accumulator with a holding chamber for the hydraulic fluid and a separate gas chamber, and communicates with the actuator via a connecting line. In order to construct a hydropneumatic springing system for vehicles with a largely linear spring behavior up to complete relief of the load, a further storage element is connected to the actuator via a connecting line and is constructed as an elastomeric accumulator.

Abstract: A vibration damping system for absorbing shock loads includes a hydraulic damper containing a piston slidably reciprocating within an oil filled chamber and dividing the chamber into a pair of subchambers. A hydraulic motor is in fluid communication with and located between the subchambers and is controlled by a field responsive fluid, such as an electrorheological (ER) actuated device. The hydraulic motor transforms fluid motion into rotating motion by a pair of meshing gears. The ER device is a flow cell and is connected to a shaft of one or both of the meshing gears. The magnitude of an electric field applied to the ER fluid controls the flow rate of the hydraulic fluid passing through the hydraulic motor by controlling the resistive force to the rotary motion of the gears. A plurality of check valves controls the direction of flow of the hydraulic fluid between the hydraulic motor and the subchambers.

Abstract: A suspension strut having a piston tube containing a floating piston, slidable within a cylinder tube. A collar is fixed to the inner surface of the cylinder tube and contains a tapered wear ring. As the strut expands by extending the piston tube relative to the cylinder tube, the tapered wear band slides over valve orifices in the outer surface of the piston tube, gradually cutting off fluid flow from the annular space between the two tubes into an end cavity of the strut, thus increasing damping and reducing the likelihood of metal to metal contact at full strut extension. This reduces shock loads on the strut for smoother vehicle operation and increased component life.

Abstract: Shock absorber, having a cylinder in which a piston rod is arranged as a displacer and which has a piston which subdivides a working space filled with damping medium into two working chambers. Arranged concentrically with this cylinder is an outer tube which, together with the cylinder, forms an annular space sealed off from the atmosphere by seals. The outer tube, together with the piston rod, executes a synchronous movement relative to the cylinder as a function of the reciprocating movement. At least one of the seals of the annular space is arranged in a fixed location with respect to the cylinder, and at least another one of the seals is arranged in a fixed location with respect to the outer tube, so that the annular space has a volume which varies as a function of the reciprocating position of the shock absorber. The annular space is connected via at least one flow connection to at least one of the working chambers.

Abstract: This invention relates to an adjustment device for a hydraulic shock absorber. This hydraulic shock absorber device is characterized in that it comprises a monoblock head (1) designed to be fitted with a removable shock absorber cylinder, a fluid reservoir and adjustment device (2, 3, 6) for high shock absorber piston displacement speeds and adjustment device (2, 3, 4) for low shock absorber piston displacement speeds, the monoblock head (1) comprising a duct enabling fluid circulation between the shock absorber and the reservoir, in which the high and low speed adjustment device (2, 3, 4, 6) are assembled such that their axes of symmetry are coaxial with the duct.

Abstract: A suspension control unit as well as a control valve for such unit are provided which are incorporated in a computerized suspension system which automatically and continuously monitors and control's a vehicle's ride performance. The suspension control unit is composed of an actuator and a fluid control unit. A valve is coupled to the actuator for controlling the fluid pressure within the actuator. The valve has an annular body having a side inlet passage and an outlet opening in communication with the reservoir. A poppet driven by a solenoid is slideably fitted within the body wherein the poppet can slide between a first position blocking flow to the outlet opening and a second position not blocking the flow to the outlet opening. The poppet has a shoulder that is exposed to the inlet. Fluid pressure to the inlet of the valve acts on the differential area of the poppet to produce an poppet retracting force which is opposed by the force of an electrically adjustable solenoid.

Abstract: This invention pertains to an oil brake that includes a piston (3) which is mounted on the free end of a movable tubular rod (4) that moves in a hollow cylindrical body (2), limiting, on both sides of the piston, a first working volume (21) and a second working volume (22), whereby a central rod (34) is arranged inside of tubular rod (4), whereby tubular rod (4) has at least one lateral opening (24) that connects second working volume (22) to first working volume (21) via a central passage (25) that is made between tubular rod (4) and central rod (34) and is formed by a relative difference in transverse dimensions between central rod (34) and the inside diameter of tubular rod (4), whereby opening or openings (24) are formed on tubular rod (4) at a distance from piston (3) that is essentially equal to at least half the thickness of the piston, whereby the end of hollow cylindrical body (2) is tightly closed by a plug and/or a stem guide (5) that is designed in such a way that, before the end of the expansion

Abstract: The present invention provides an improved method and apparatus for controlling damping in a shock absorber based on the relative acceleration between the shock main body and the piston rod extended from the shock main body. The shock absorber has a reservoir compartment and a fluid-filled internal chamber divided into a compression compartment and a rebound compartment by a movable piston. A piston rod is connected to the piston and extends through a seal in the rebound end of the internal chamber. The shock absorber contains flow passages connecting, and normally allowing fluid to flow between, the reservoir compartment, the compression compartment and the rebound compartment. Fluid flow in the flow passages, which is directly related to the relative motion between the shock main body and the piston rod assembly, is allowed or inhibited based on the relative acceleration between shock absorber components.

Abstract: A fluid regulating device includes a regulator housing that confines a valve receiving chamber and a fluid chamber filled with hydraulic fluid. The regulator housing is formed with a fluid opening that is in fluid communication with the valve receiving chamber and that is connected fluidly to a fluid port of a hydraulic cylinder device. A pneumatic cylinder device includes a cylinder housing with a piston member slidingly and sealingly disposed therein to divide the same into a volume-variable pressurized gas compartment and a volume-variable fluid compartment which is in fluid communication with the fluid chamber via a fluid aperture. A regulating valve unit is disposed in the valve receiving chamber to control flow rate of the hydraulic fluid between the fluid opening and the fluid chamber.

Abstract: The invention relates to a spring-and-damper unit with an external storage device for installation between a vehicle body and a wheel guidance part. To create the greatest possible supporting length for the piston rod in a given installation space, the storage device is preferably connected to a spring plate, on which rests a carrying spring embodied as a coil spring, while the spring plate is arranged in a pressure-tight fashion on the cylinder or a container surrounding the cylinder. The interior of the cylinder or the container is hydraulically connected to the storage device via a connecting channel in the spring plate.

Abstract: A hydropneumatic spring, which is preferably articulately arranged between a vehicle body and a wheel guiding part in motor vehicles, has a fluid-filled cylinder which is entered by an outwardly sealed piston rod having a piston connected at the internal end. For altering spring force-deflection progressivity characteristic, a first working chamber of the cylinder is in constant hydraulic connection with a first spring energy store device and a second working chamber of the cylinder is in constant hydraulic connection with a second spring energy store device via a second valve device via a first valve device. In a mid spring deflection range, a second spring energy store device is connected via a second valve device and a bypass to the first spring energy store device. The bypass includes an axially extending channel arranged between the first working chamber and the second working chamber.

Abstract: A hydraulic apparatus is used in an industrial vehicle. The apparatus has a hydraulic cylinder interposed between a vehicle frame and an axle swingably coupled to the frame. A passage connects a first chamber with a second chamber defined by a piston in a cylinder case. The piston is movable based on differential pressure in the chambers. A cylinder rod selectively extends and retracts in respect with the cylinder case to absorb a swinging motion of the axle. The passage is selectively open and closed based on at least one of a traveling state and a loading state of the vehicle. The piston has a first surface defining the first chamber and a second surface defining the second chamber. The first surface has an area equal to that of the second surface.

Abstract: The present invention provides a hydraulic shock absorber 10, with a cylinder 12 which is filled with a hydraulic fluid; a piston 14 connected to one end of a piston rod 15, which is slidably located in the cylinder; and a free piston 47 which is slidably located in the cylinder so as to partition the cylinder into a gas chamber 45 and an oil chamber 16A, and wherein a gas chamber cartridge 48 is inserted into one side of the cylinder 12 so as to be fixed thereto, and the free piston 47 slidably disposed in a gas chamber case 46 of the gas chamber cartridge 48, defining one chamber partitioned by the free pistion 47 of the gas chamber case 46 as the gas chamber 45 encloses a gas therein, and defining the other chamber partitioned by the free pistion 47 of the gase chamber case 46 as connected to the oil chamber 16A on the other side of the cylinder 12.

Abstract: The compensator is made separately from the cylinder of the shock absorber, and the two parts are prearranged for the reciprocal coupling with the possibility of articulation around said cylinder and/or around an axis, substantially perpendicular or orthogonal to the axis of the shock absorber itself.

Abstract: A self-pumping hydropneumatic spring strut that continuously regulates the pressure in the low- and high-pressure work cavities of the work cylinder to control the height of the vehicle body during all vehicle operation situations. According to the present invention, a valve is provided between the high-pressure work cavity and the pump cylinder. The valve is movable axially within the pump cylinder and advantageously blocks a first nonreturn valve between the pump cylinder and the low-pressure work cavity when spring strut is caused to elongate, and unblocks this first nonreturn valve when the spring strut is caused to compress.