Abstract: A bicycle shock absorber and methods for differentiating between rider-induced forces and terrain-induced forces includes a first fluid chamber having fluid contained therein, a piston for compressing the fluid within the fluid chamber, a second fluid chamber coupled to the first fluid chamber by a fluid communication hose, and an inertial valve disposed within the second fluid chamber. The inertial valve opens in response to terrain-induced forces and provides communication of fluid compressed by the piston from the first fluid chamber to the second fluid chamber. The inertial valve does not open in response to rider-induced forces.

Abstract: A track system for providing complementary shock absorbing capability to a primary shock absorbing assembly having a hydraulic path containing fluid. The track system includes a chamber, a damping assembly and an adjusting assembly. The chamber has opposite first and second ends, the first end of the chamber being provided with a port operatively connectable to the hydraulic path of the primary shock absorbing assembly, the port being configured for allowing fluid from the hydraulic path of the primary shock absorbing assembly to enter and exit the chamber of the track system through the port thereof. The damping assembly is configured for damping a flow of fluid entering the chamber via the port thereof. The adjusting assembly is configured for adjusting a damping mode of the damping assembly.

Abstract: A damper including an inertia valve movable between an open position and a closed position to selectively alter the compression damping rate of the shock absorber is disclosed. In these embodiments, the damper has at least one chamber that at least partially surrounds two other chambers.

Abstract: A bicycle suspension assembly having an inertia valve is described. A blow-off valve that permits fluid flow through the suspension assembly when the fluid pressure in the suspension assembly exceeds a predetermined threshold may be included.

Abstract: A bicycle suspension assembly including an inertia valve is described. The suspension assembly includes first and second telescopingly engaged tubular portions configured to move closer together during compression of the suspension assembly. The bicycle suspension assembly may include an air spring tending to expand the bicycle suspension assembly.

Abstract: A damper including a valve movable between an open position and a closed position to selectively alter the compression damping rate of the shock absorber. The valve may be responsive to a vertical acceleration sensor.

Abstract: A shock absorber comprises first and second axially aligned cylinders (11, 21) each having a liquid filled prison chamber (12, 22), an axially displaceable piston (13, 23), received in the piston chamber (12, 22), and dampeners (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: The present invention is an adjustable fluid friction valve. It is comprised of a left cap, a casing, a right cap, a fluid reservoir, a rotated-member, a stem, and an adjustment grip. The adjustment grip is turned by the user's hand and connects to and turns the central stem that connects to and turns the rotated-member. The rotated-member communicates fluid flow to different cross-sections of an annular passage that is disposed in the left cap where it is used for variable flow restriction. It is a groove having a varying cross-sectional area along its length with a smaller beginning terminal and a larger concluding terminal. The smaller beginning terminal is blind and the larger concluding terminal communicates with the mid passage of the left cap. The mid passage communicates with the fluid reservoir. The annular passage receives fluid flow from the rotated-member at a cross-section of its length. A smaller cross-section is accompanied by a longer length.

Abstract: A front fork, which is interposed between a vehicle body and an axle to restrain a change in vehicle attitude, comprises a fork body (101) including a reservoir chamber (106) partially filled with gas and performing an expansion and contraction operation, a reservoir tank (102) partially filled with gas and communicating with the reservoir chamber (106) through a flow path (103) in which hydraulic oil flows, an on-off valve (35) switching between opening and closing of the flow path (103), and a relief valve (40) accepting flow of hydraulic oil from the reservoir chamber (106) toward the reservoir tank (102) when a pressure of the reservoir chamber (106) reaches a predetermined pressure.

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 gas damper includes a gas pressurized working chamber and valving within the piston to control flow of the gas through the piston. A system is in communication with the working chamber to control the gas pressure within the working chamber in order to control the damping characteristics of the damper. An electronic control unit is utilized to control the opening and closing of the valving within the piston to also control the damping characteristics of the damper.

Abstract: A strut (12) is configured for an active suspension system (142) which provides electronic control for both the force applied by the strut (12) and the dampening characteristics of the strut (12). A compressible fluid (18) is used within the strut (12), and preferably includes a compressible base fluid and electromagnetic field responsive particles (132) which are suspended in the compressible base fluid. The electromagnetic field responsive particles (132) are preferably closely matched in density and modulas of elasticity to that of the compressible base fluid to prevent sedimentation of the particles (132) and to maintain the elasticity of the compressible fluid (18). The amount compressible fluid (18) within the strut (12) is electronically controlled to determine the force applied by the strut (12) and a field strength applied to the compressible fluid in a fluid flow passage is electronically controlled to determine the dampening characteristics of the strut (12).

Abstract: A telescopic fork leg with damping system comprising piston and piston rod arrangements. The arrangements perform longitudinal shift motions in a medium-containing chamber. The chamber is situated in a tubular part belonging to the damping system. The piston rod arrangement is designed so as in the chamber, with its parts present therein, to have substantially constant volume regardless of the shift motions. Substantial displacement creation is thereby prevented. Moreover, the medium strives to assume and maintain a particular pressure, preferably a positive pressure, on the low-pressure side of the piston arrangement. Positive pressure build-up is therefore present in the damping system and the pressure on the low-pressure side does not need to be lower than the system pressure. A valve arrangement for handling a displacement can therefore be eliminated and the telescopic fork leg can be given an advantageous and easy-to-use structure with, for example, adjustment facilities for leak flows.

Abstract: A damping apparatus for damping vibrations in a vibrating system including a piston which is reciprocally movable in a hydraulic fluid filled damper chamber, piston movement in either direction of movement being resisted by fluid pressure in the damper chamber behind the piston, which resistance provides damping forces which act to oppose piston movement, the piston being connected to one component of the vibrating system and the damping chamber being connected to a second component of the vibrating system, characterised in that the fluid at at least a first side of the piston acts on a movable part which is movable in response to changing fluid pressure in the damper chamber at the first side of the piston as the piston moves, the movable member providing a relief volume for the fluid into which and from which fluid may flow from and towards the first side of the piston without passing to an opposite second side of the piston.

Abstract: A telescopic fork leg incorporates mutually displaceable inner and outer tube parts and a damping arrangement for damping the relative movements of the tube parts. The damping arrangement comprises tubular and coaxially disposed units. A piston belonging to a first outer tube part operates in a chamber within the interior of the tubular units in a medium present in the chamber, which medium, at a piston speed above a chosen value, is transferred between the top and bottom sides of the piston via passage(s) disposed in, on or by the piston and adjustable damping-influencing members.

Abstract: A dual tube shock absorber includes a spool valve located between the upper working chamber and the reserve chamber. The spool valve moves with the piston rod to open and close a flow path between the upper working chamber and the reserve chamber. This provides a low damping characteristic for small movements of the piston rod which changes to a high damping characteristic for larger movement of the piston rod.

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 with amplitude-dependent damping force includes a cylinder, in which a piston rod, carrying a piston, is guided with freedom of axial movement, where the piston divides the cylinder into a working space on the piston rod side and a working space on the side away from the piston rod. The piston rod carries at least part of a housing, which is mounted in the direction of the piston rod-side working space, and where a separating body is supported inside the housing with freedom to slide. The separating body divides the housing into first and second working chambers, where the first working chamber is connected by at least one radial connecting opening to the piston rod-side working space and the second working chamber is connected by a connecting channel to the working space on the side away from the piston rod. At least a part of the housing is connected to the piston rod by a weld.

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 shock absorber according to the present invention includes a pressure tube having a working chamber disposed therewithin. A piston is slidably disposed within the working chamber and divides the working chamber into an upper working chamber and a lower working chamber. An intermediate tube is disposed around the pressure tube and the working chamber to define an intermediate chamber. A reserve tube is disposed around the intermediate tube. A collar is attached to the intermediate tube. The collar is defined by a shoulder portion extending generally lateral to the intermediate tube and a radial neck portion extending generally perpendicularly to the intermediate tube. An external control valve includes a valve seat received within the collar in an installed position. The external control valve is attached to the reserve tube.

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 shock absorber damper assembly is provided that includes a working cylinder filled with fluid. A piston and rod are disposed in the working cylinder and move along an axis to provide dampening during a compression stroke. For a twin tube arrangement, a reservoir surrounds the working cylinder and may include a gas cell to accommodate the volume of the rod. A recoil valve controls flow of the fluid from the working cylinder to the reservoir during a recoil stroke. The recoil valve has an opening force controlling damping during the recoil stroke. A fluid passageway, which may be located in the reservoir, connects the working cylinder and the recoil valve. A check valve is disposed in the fluid passageway and opens to receive the fluid during the compression stroke. The check valve closes during the recoil stroke to retain the fluid against the recoil valve at a pressure and adjust the opening force of the recoil valve.

Abstract: A drag damper for use on a rotary-wing aircraft rotor comprises a body defining two variable volume chambers linked by a piston. The chambers filled with fluid in the damper are connected by a restrictor port in the piston or between the latter and the body, and via a channel of great length and small cross-section compared with the cross-section of the body, in which elastic means bear against and load the piston-rod assembly towards a neutral position, the anti-resonance frequency of the damper being matched substantially to the nominal rotation frequency of the rotor, and the restrictor port providing effective damping at the natural frequency (??) of the blades in drag, differing by construction from the rotor frequency (?).

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 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 cushion assembly for motorcycles includes an outer tube having a recess defined through a first end thereof and a hydraulic cylinder is received in the recess. A valve is connected to the cylinder and communicates with a locking hole defined in a second end of the outer tube. A cap is engaged with an opening in the first end of the outer tube and has a through hole so that an inner tube is movably inserted through the through hole in the cap, received in the recess and engaged with the cylinder. The length of the outer tube and the recess are made longer so as to be installed to a modified version of motorcycles.

Abstract: A two-stage piston has a twin piston design where one piston produces a high damping force and the second piston produces a low damping force. At specified positions along the pressure tube, by-pass passages are formed to allow fluid flow around the high damping force piston to provide a low damping force or a soft ride. In the areas of the pressure tube where there are no by-pass passages, the high damping force piston provides a high damping force or a firm ride. In the area of the pressure tube where there are no by-pass passages, the high damping force piston and the low damping force piston both contribute to the high damping force.

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: A bi-directional shock and vibration dampener, which affords isolation from undesirable motion in one axis while maintaining positional rigidity on another axis. The invention consists of an attachment with bearings conformed along a shaft to allow axial movement between them. The shaft may be attached with a close tolerance piston centered in a cylinder dividing the cylinder into two chambers. Internal springs and transfer of gas or fluid between chambers achieve bi-directional dampening. Alternately, the dampning effect may be achieved externally to the assembly. In another mount configuration, a gimbal mount with angular deflection sensors and servo drive may be used to maintain desired position relative to horison for motion picture cameras or other equipment. Angular position is held constant while the atachment changes angle on a single plane.

Abstract: A suspension assembly is provided that includes a shock absorber having a housing filled with hydraulic fluid. An air spring is supported on the shock absorber, and the air spring includes a bladder filled with air. A valve assembly is surrounded by the fluid housing and the bladder. The valve assembly is in fluid communication with the hydraulic fluid and air. The air manipulates the valve and adjusts flow of hydraulic fluid through the shock absorber to adjust damping based upon vehicle load experienced at the air spring. Preferably the valve assembly is located within the inner cylinder head arranged between the piston rod and the outer cylindrical wall of the shock absorber. The valve assembly may include a teeter-totter valve that cooperates with other valves plungers and springs to provide variable damping throughout the vehicle load experienced by the inner spring.

Abstract: A brake system for garage doors including a piston assembly movable within a longitudinal housing assembly and including a central through opening and a threaded bushing rigidly mounted to the piston assembly. A threaded axle is cooperatively received by the threaded bushing so that the rotation of the axle causes the piston assembly to move at a predetermined speed longitudinally within the housing assembly. Longitudinal connecting apertures permit the flow of fluid adjacent to the ends of the piston assembly to flow through. A flapper valve assembly is mounted to one of the ends of the piston assembly by a separating spring member. When the movement of the piston assembly exceeds a predetermined magnitude, the spring member is compressed eliminating the clearance and closing the connecting apertures. This prevents any additional flow and rotational movement of the threaded axle, which in turn is mechanically connected to the counterbalance axle of an opening and closing mechanism for garage doors.

Abstract: A buffering mechanism comprises a block member which is installed detachably in an actuator body, a piston which compresses air in a compressing chamber when a movable element abuts against the piston, and a check valve and a variable throttle valve which are provided in a passage for communication between the compressing chamber and the outside of the actuator body and which adjust a flow rate of the air discharged to the outside.

Abstract: A hydraulic dashpot with a cylinder (1) full of shock-absorbing fluid, with a piston (3) mounted on the end of piston rod (2), traveling back and forth inside the cylinder, separating the cylinder into two compartments (4 & 5), and provided with ports and shock-absorption valves, and with a variable bypass system accommodated in an axial bore (13) in the piston rod provided with lateral radial openings (11 & 26) extending through the rod. The object is to allow fixed independent establishment of the cross-section of the bypass system available for the fluid to flow through as the piston rod travels in the direction associated with the suction phase and of the cross-section of the bypass system available for the fluid to flow through as the piston rod travels in the direction associated with the compression phase.

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 rod guide is press-filted to an inner periphery of an outer cylinder and to an inner periphery of an inner cylinder. A rod seal is provided at an inner periphery of a cover member for covering the outer cylinder to seal between a piston rod and the cover member. Space between the rod seal and the rod guide is formed as a hydraulic fluid reservoir chamber. Further, a lip seal is integrally formed on an outer periphery of the rod seal. The lip seal is set so as to separably abut a valve seat surface of the rod guide. One side surface of the lip seal is provided with a plurality of radially extending hydraulic fluid grooves spaced from each other in a circumferential direction. With this arrangement, a valve opening pressure of the lip seal can be kept small regardless of size of interference of the lip seal. Thus, air removability is improved.

Abstract: A vibration damper, particularly a mono-tube vibration damper, has a cylinder in which a piston rod is arranged together with a piston so as to be axially movable, wherein the piston divides the cylinder into two work spaces filled with a work medium, the vibration damper having at least one deaerating device at the outer surroundings of the vibration damper for the areas filled with the work medium.

Abstract: A vehicle suspension is provided. The suspension includes a first assembly that is mounted between the vehicle axle and frame and provides controlling damping of movement of the unsprung mass of the vehicle. The suspension also includes a second assembly that is mounted to the vehicle frame and provides controlled damping of movement of a spring disposed against the vehicle frame. The first and second assemblies are in fluid communication. The suspension allows the spring to be mounted remotely from the vehicle axle and increases roll stiffness of the vehicle by allowing spring reaction points to be moved outboard of the vehicle frame rails.

Abstract: A hydraulic dashpot with a cylinder (1) full of shock-absorbing fluid, with a piston (3) mounted on the end of piston rod (2), traveling back and forth inside the cylinder, separating the cylinder into two compartments (4 & 5), and provided with ports and shock-absorption valves, and with a variable bypass system accommodated in an axial bore (13) in the piston rod provided with lateral radial openings (11 & 26) extending through the rod. The object is to allow fixed independent establishment of the cross-section of the bypass system available for the fluid to flow through as the piston rod travels in the direction associated with the suction phase and of the cross-section of the bypass system available for the fluid to flow through as the piston rod travels in the direction associated with the compression phase.

Abstract: A damping apparatus for damping vibrations in a vibrating system including a piston which is reciprocally movable in a fluid filled chamber, piston movement in either direction of movement being resisted by fluid pressure in the chamber behind the piston, which resistance provides damping forces which act to oppose piston movement, the piston being connected to one component of the vibrating system and the chamber being connected to a second component of the vibrating system, characterised in that structure is provided to relieve the fluid pressure behind the piston to allow substantially unopposed piston movement in the chamber without damping forces being provided, during piston movements which occur in response to vibrations in the vibrating system at frequencies other than a fundamental frequency which the damping apparatus primarily is intended to damp.

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 magneto-rheological (MR) damper provides a higher than minimum level of damping when a power source to the MR damper is not supplying a control current. The present invention damper includes magnets positioned to direct a magnetic flux across a MR fluid path. The fluid path is created when a rod and piston assembly stroke the fluid though a control valve assembly attached to a damper chamber causing a resistance to MR fluid flow. An electric coil cancels an effect of the permanent magnets when the control current is available to allow a control circuit more operating range. The permanent magnets allow for damping when no control current is available.

Abstract: A suspension damper assembly capable of adjusting the height of an automobile includes a cylinder tube defining a pumping chamber aligned concentrically within a reservoir tube. A fluid reservoir is defined between the reservoir tube and the cylinder tube. A piston is slideably disposed within the cylinder tube. A gas cup is slideably disposed within the assembly and separates a fluid chamber within the cylinder tube from a gas chamber. The gas cup includes a cup conduit connecting the pumping chamber to the reservoir chamber whereby stroking the gas cup pumps fluid into the pumping chamber increasing the outward force of the piston for raising the height of the vehicle. A piston shaft guide includes a shaft valve allowing fluid to pass from the pumping chamber to the reservoir chamber for reducing the outward force of the piston and lowering the height of the vehicle.

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: The flow of a hydraulic fluid between connecting ports caused by sliding movement of a piston in a cylinder is controlled by a fixed orifice and the flow path area determined by ports that is varied by a spool, thereby directly controlling orifice characteristics. At the same time, the pressure in a pilot chamber is changed by the pressure loss between the ports to change the valve opening pressure of a main valve, thereby controlling valve characteristics. An orifice passage is provided in parallel to the ports. Thus, when the flow path area determined by the ports is restricted, variations in the flow path area attributable to machining accuracy or the like can be absorbed by the flow path area of the orifice passage provided in parallel to the ports. Therefore, stable “hard” damping force characteristics can be obtained.

Abstract: The present invention is directed to shock absorbers, including position-sensitive shock absorbers (2) in which the position-sensitive damping can be different during compression and rebound strokes, and shock absorbers (60) with damping adjusters (80, 118) which vary the damping provided during compression and rebound strokes. The position-sensitive shock absorber includes a cylinder (4) within which a piston (122) is movably mounted for movement between the first and second ends of the cylinder. Bypass openings (24-32) open into the cylinder interior (6) at axially spaced-apart positions. The bypass openings are coupled by a bypass channel (38). A flow valve (40, 42) may be positioned along the bypass channel permitting fluid flow from the first opening to the second opening and restricting fluid flow from the second opening to the first opening.

Abstract: A shock absorber (1) having a longitudinal axis of rotation (XX′) comprises a shock absorber body (2), a principal piston (4), which is supported by a piston rod (5), and a principal compression chamber (3), in which the principal piston (4) slides. The piston (4) divides the interior of the chamber (3) into a front internal portion and a rear internal portion. The sliding occurs wit the compression of the shock absorber (1) from the front to the rear internal portion. Further, the shock absorber (1) includes an elastic return device (8), a volume compensation device (9), hydraulic fluid (7), and at least one rolling channel. The rolling channel is comprised of at least one portion of the internal surface of the peripheral wall of the principal compression chamber (3) and at least one portion of the external wall of the principal piston (4).

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: A hydraulic shock absorber includes an inner cylinder filled with a working oil, an outer cylinder, and a reservoir defined between the inner and outer cylinders. A piston is slidably disposed within the inner cylinder so as to divide the interior of the inner cylinder into an upper cylinder chamber and a lower cylinder chamber. A piston rod is connected to the piston. A tubular member is disposed between the inner and outer cylinders and has a radial port. A damper mechanism is attached to the outer cylinder so as to control the flow of the working oil to produce a damping resistance. The outer cylinder includes a mounting projection with a substantially flat top surface on which the damper mechanism is secured. A sleeve has one end inserted into the port of the tubular member and the other, flanged end terminating at the top surface of the mounting projection. A first sealing element is secured between the sleeve and the port to provide a seal between the sleeve and the tubular member.

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 oil shock absorber system includes a piston and cylinder arrangement for driving oil from the cylinder to a reservoir. The reservoir includes a reserve chamber and a chamber intermediate the cylinder and the reserve chamber. A flow path including three different orifices communicate between the intermediate and reserve chambers, with two orifices having adjustable non-return valves. One valve constitutes an adjustable hydraulic brake evacuating oil from the intermediate chamber into the reserve chamber only when the cylinder pressure exceeds a predetermined pressure. The second valve is adjustable for a range of piston displacement speeds that lies between a first low speed and hydraulic brake speeds.