Abstract: A damping valve includes a valve body, the valve body having at least one through hole and a valve seating surface. There is at least one valve disk configured to mate with the valve seating surface and at least partially seal the through hole and a first spring configured to bias the at least one valve disk towards the valve seating surface. A stop ring is configured to support the first spring on a first surface and an intermediate ring is configured to be supported by the stop ring on a second surface of the stop ring opposite the first surface. A second spring is configured to bias the intermediate ring against the stop ring.

Abstract: A shock absorber (100) for suppressing vibration in a vehicle includes a valve disk (1) that delimits the interior of a cylinder (40) in which a working fluid is sealed; a first passage (2a), a second passage (2b) and a third passage (2c), which are disposed in series so as to connect pressure chambers (41, 42) delimited by the valve disk (1); a valve body (10) that selectively opens the first passage (2a) and the second passage (2b); a biasing member (15) that biases the valve body (10) in a direction for closing the first passage (2a) against the pressure in one of the pressure chambers (42); and a bypass passage (10a) that connects the first passage (2a) to the third passage (2c) when the valve body (10), having displaced in accordance with the pressure in the one pressure chamber (42) so as to open the first passage (2a), displaces further so as to close the second passage (2b).

Abstract: A hydraulic damping device for drawer includes a cylinder holding a hydraulic fluid, a piston rod moving in and out of the cylinder and having a pin at one end inside the cylinder, a rigid valve block affixed to the inner end of the pin of the piston rod and having equiangularly spaced through holes, a retainer affixed to the outer end of the pin of the piston rod, a piston coupled to the pin of the piston rod and movable along the pin between the rigid valve block and the retainer and having a plurality of axially extending through holes, a number of the through holes of the piston being respectively aimed at the through holes of the rigid valve block for allowing the hydraulic fluid to pass through the piston in one direction at a high speed during outward stroke of the piston rod and to pass through the piston in the other direction at a low speed during inward stroke of the piston and a plurality of spring strips for stopping against the rigid valve block, and a shock absorbing device that buffers the imp

Abstract: A damping mechanism (1) that generates a damping force in response to a liquid flow between a first liquid chamber (R1) and a second liquid chamber (R2) comprises a partitioning member (2) separating the first liquid chamber (R1) and the second liquid chamber (R2) and a flow passage (P) formed in the partitioning member (2) to connect the first liquid chamber (R1) and the second liquid chamber (R2). The flow passage (P) comprises an odd number of through-holes (10-14) greater than three which penetrate the partitioning member (2) and are connected in series. A large amount of frictional energy loss due to a long path length occurs in the flow passage (P) and causes the damping mechanism (1) to generate a sufficient damping force.

Abstract: Shock absorber provided with a piston and a cylinder, both secured to a part of a vehicle. A nonreturn valve is present in either the piston or the base of the cylinder. The nonreturn valve includes a valve plate and a valve seat plate, both annular. Near the center, the valve plate is arranged at a distance from the valve seat plate. At low flow velocity, elasticity of the valve plate keeps it at a distance from the valve seat plate, allowing unimpeded flow. As flow increases, the valve plate deforms elastically, gradually closing off a diametral opening in the valve seat plate. An opening remains between the valve plate and the valve seat plate at the spacer. As the pressure difference across the nonreturn valve increases, the valve plate closes off with respect to the valve seat plate over the entire circumference. This movement takes place as a wave.

Abstract: A first piston and a second piston coupled to a piston rod are fitted in a cylinder, and an intermediate chamber is formed between the first and second pistons. A compression-side check valve and an extension-side check valve are provided at the first piston and the second piston. An extension-side main valve and a compression-side main valve are disposed in the intermediate chamber. A downstream side of a damping force adjusting valve is connected to the intermediate chamber. Inner pressures of an extension-side backpressure chamber and a compression-side backpressure chamber are adjusted by the damping force adjusting valve, whereby valve opening of the extension-side and compression-side main valves is controlled. Hydraulic fluid of the downstream side of the damping force adjusting valve is first sent into the intermediate chamber, and then is sent to a cylinder upper chamber or a cylinder lower chamber.

Abstract: A vibration damper with amplitude-selective damping force includes a piston rod carrying a piston arrangement axially movably arranged in a cylinder and dividing the cylinder into two working spaces. A flow connection is present between the working spaces and controlled by an axially movable switching ring which cooperates with a working surface which faces the ring to define a pilot opening cross section. A bypass channel with at least two connecting openings to the flow connection is provided hydraulically in parallel to the flow connection. At least one connecting opening upstream of each of two stop surface of the switching ring. A check valve arrangement separates the bypass channel and the flow connection from each other in the different flow directions as a function of the movements of the piston rod, the check valve arrangement having two check valves which close in opposite directions.

Abstract: A vibration damper having a sensitive response behavior at very low amplitudes comprises a separating piston being disposed inside a bypass so as to move axially freely. The separating piston divides the bypass into two chambers mutually sealed from one another. Two valves are disposed in the bypass. The first valve acts in a compression stage as a pressure limiting valve and as a non return valve in an extension stage. The second valve acts as a pressure limiting valve in the extension stage and as a non return valve in the compression stage.

Abstract: A controllable damping force hydraulic shock absorber including a pilot type damping valve having a back-pressure chamber for each of an extension stroke and a compression stroke. A piston connected to a piston rod is fitted into a sealed cylinder in which a hydraulic fluid is contained. During an extension stroke of the piston rod, the hydraulic fluid in an upper cylinder chamber flows to a lower cylinder chamber through an extension-side hydraulic fluid passage, an extension-side orifice hydraulic fluid passage, an extension-side back-pressure chamber, an axial hydraulic fluid passage, a radial hydraulic fluid passage, a compression-side back-pressure chamber, an extension-side check valve and a compression-side hydraulic fluid passage.

Abstract: Damping valve comprising a damping valve body with a through-channel system, which is covered on at least one outlet side by a number of valve disks, where a nonreturn valve disk releases an advance cross section when the damping medium is flowing in one direction and closes off that cross section when the damping medium is flowing in the other flow direction, and where a cover disk with at least one cross section which can be actuated by the nonreturn valve disk limits the lifting movement of the nonreturn valve disk, and where a second cover disk limits the lifting movement of the nonreturn valve disk in the direction opposite that in which the first cover disk works.

Abstract: A vibration damper piston includes a piston body with a bore from which first and second apertures respectively provide paths to first and second chambers of the vibration damper. A valve spool in the bore defines a pilot chamber and controls fluid flow between the first and second apertures. First and second springs bias the valve spool in opposing directions. A control orifice provides a continuous fluid path between the first chamber and the pilot chamber, and a variable orifice provides another fluid path between the second chamber and the pilot chamber. An actuator is operably connected to adjust the variable orifice in response to a control signal.

Abstract: Shock absorber provided with a piston having a number of constantly open connecting channels which connect the two sides of the piston, and having a number of connecting channels to be opened and closed by element of a valve. The valve includes a plate valve which under the influence of flow therethrough, i.e. the pressure difference over the piston, on the outward movement of the shock absorber can be closed to a greater or lesser extent. On the inward movement, unimpeded flow of fluid through the piston can occur. A flow-through path is bounded by the corresponding connecting channels and the valve together with the upper side of the piston. In the rest position there is a flow-through possibility for fluid when the shock absorber fixings move away from each other, and when the shock absorber fixings move away from each other more quickly the flow-through cross section gradually decreases until the valve closes completely.

Abstract: A hydraulic damper includes a cylinder holding a hydraulic fluid, a piston rod movable in and out of the cylinder, a rigid valve block coupled to the piston rod and having equiangularly spaced through holes, a piston coupled to the piston rod and having a plurality of axially extending through holes, a number of the through holes of the piston being respectively aimed at the through holes of the rigid valve block for allowing the hydraulic fluid to pass through the piston in one direction at a high speed during outward stroke of the piston rod and to pass through the piston in the other direction at a low speed during inward stroke of the piston and a plurality of spring strips for stopping against the rigid valve block, and a cushion block that buffers the impact of the rigid valve block when the piston rod is extended out of the cylinder.

Abstract: An apparatus for controlling relative movement between two interconnected bodies includes a first end cap, a second end cap having an opening, a sleeve interconnecting the end caps to define a chamber between the sleeve and the end caps, a piston assembly including a piston rod extending through the opening of the second end cap, a piston connected to the piston rod, received in the chamber to define at least two fluid chambers on opposed sides of the piston, and a plurality of rollers carried by the piston for rolling engagement with the sleeve. A fluid flow path provides communication between the fluid chambers and provides a restricted fluid flow rate therethrough to control the rate of fluid transfer between the fluid chambers and permit fluid pressure to increase in a chamber into which the piston is being moved to provide a force on the piston opposing its movement.

Abstract: A speed responsive damper (10) comprises: a cylinder (11) in which a fluid is enclosed; a piston (13) that is slidably fitted into the cylinder and that has an orifice (19a) through which a fluid passes; a piston rod 14 whose one end is fixed to the piston and whose the other end is extended to the outside of the cylinder; and a slider 15 that is installed within the cylinder, and that moves in a predetermined range relative to the piston, and that adjusts an amount of the fluid passing through the piston, wherein the orifice is formed at a front end side of the piston. Therefore, explosive sound of air can be reduced, and swirl or slip of oil can be previously prevented, and a piston rod can be prevented from tilting.

Abstract: There is provided a vibration isolator in which a restriction passage for causing a main fluid chamber and a sub-fluid chamber to communicate with each other is changed over to one of a first restriction passage and a second restriction passage according to a change in the frequency of vibrations in a short period of time, and the size of the isolator is made small efficiently. A plunger member 78 closes an orifice opening 74 when being moved to a closing position against the urging force of a coil spring 90 by the fluid pressure in a pressurization space 130, and opens the orifice opening 74 when being returned to an opening position by the urging force of the coil spring 90. For the orifice opening 74, the opening ratio R between the transverse opening width along the axial direction and the longitudinal opening width along the circumferential direction is set in the range of 2?R?25, further preferably 5?R?20.

Abstract: A hydraulic shock absorber in which the flow of hydraulic fluid induced in each of extension and compression hydraulic fluid passages, by sliding movement of a piston, is controlled by a main disk valve to generate damping force. The valve opening pressure of the main disk valve is adjusted by the pressure in a back-pressure chamber. In a low piston speed region, the main disk valve closes a back-pressure chamber inlet passage. Therefore, the pressure in the backpressure chamber will not rise, and sufficiently small damping force is obtained. When the main disk valve opens, the backpressure chamber inlet passage opens simultaneously. Consequently, the pressure in the backpressure chamber rises, and the damping force increases.

Abstract: The invention relates to a suspension hydraulic damper (1) comprising a tube (2) filled with working liquid, inside of which a slidable piston assembly (3), provided with compression (12) and rebound (11) valve assemblies and attached to a piston rod led outside the damper, is placed, and at least one additional compression valve system (18, 19).

Abstract: A piston connected to a piston rod is fitted into a cylinder in which a hydraulic fluid is sealably contained. A flow of the hydraulic fluid is generated in an extension-side fluid passage and a compression-side fluid passage according to a sliding motion of the piston, and this flow of the hydraulic fluid is controlled by a main disk valve, to thereby generate a damping force. A valve-opening pressure of the main disk valve is controlled by an internal pressure of a back-pressure chamber generated due to a difference in flow path area between a back-pressure chamber inlet fluid passage and a downstream-side orifice. During a reverse stroke, a check valve is opened, to thereby introduce a pressure in a downstream-side cylinder chamber into the back-pressure chamber, so that the main disk valve can be maintained in a closed position and a stable damping force can be generated.

Abstract: A shock absorber for a remote-controlled model car includes a sealing member fixed on the topside of a piston. The sealing member has two opposite flexible portions respectively matching with the flow-guiding holes of the piston, with flow gaps formed between the flexible portions and the upper outer sides of the piston. The flow gap, matching with the extent of an external force imposed upon the shock absorber, can be properly diminished or closed up. Each flexible portion is bored with a flow-adjusting hole smaller than and aligned to the flow-guiding hole of the piston for reducing the flow amount of liquid oil flowing through the flow-guiding hole. When pressed by different-extent external forces, the shock absorber can automatically adjust its buffering force to an excellent condition by adjustment of the flow-adjusting holes and the flow gaps.

Abstract: Vibration damper comprising a piston rod, which is guided with freedom of axial movement in a damping medium-filled cylinder and which carries a piston, which divides the cylinder into two working spaces. At least one of the two working spaces has a flow connection leading to a housing, in which a separating element separates at least one chamber from one of the two working spaces, where the volume of the minimum of one chamber in the housing has a size which is variable within defined limits. The separating element executes relative motion with respect to the housing, and is located in a permanent position with respect to the piston rod, whereas the housing is movable with respect to the piston rod.

Abstract: A hydraulic shock absorber includes a cylindrical housing within which a piston assembly is slidably received. The piston assembly includes a piston element connected to a piston rod and adapted to divide an interior of the housing into compression and rebound chambers. The piston element has compression and rebound passages to provide fluid communication between the compression and rebound chambers. A valve assembly includes a first valve disc positioned on a lower side of the piston element, and a second valve disc retained on the first valve disc. The second valve disc includes apertures arranged in a circumferentially spaced relationship and are selectively openable and closeable by the first valve disc. A third valve disc is retained on the second valve disc and has notches arranged in a circumferentially spaced relationship. The notches cooperate with the apertures to collectively form ports. The ports are communicated with the compression chamber.

Abstract: A high frequency dampening apparatus for dampening the travel of a high frequency cycling driver. The present invention provides an enclosed housing having a fluid disposed therein. A piston rod is partially disposed within the housing and is engageable with a high frequency driver wherein the piston rod moves between a rearward position and a forward position relative to the housing. A plurality of fingers are circumferentially spaced and extend radially outward from the piston rod. A piston head retainer is connected to and extends radially outward from the piston rod and provides an orifice extending therethrough.

Abstract: A blow-off valve for a hydraulic dashpot comprising a fluid charged cylinder (1) and a piston (3) that travels back and forth therein on the end of a piston rod. The piston partitions the cylinder into two compartments (6 & 7) and is provided with breaches (4) and shock-absorbing valves. The piston rod (2) or an extension (8) thereof is hollow and accommodates operating components (13). The object is a valve that can be accommodated along with the hydraulic lines that serve it outside the piston rod or an extension thereof. The outer surface of the piston rod is accordingly provided with at least one axial inwardly undulating groove (14) at least as long as the piston, including its fastenings and operating components, is high. Alternatively, the bore that extends through the piston rod or its extension and its fastenings and operating components is provided with a similar radially outward groove that can be closed off at the compression end by a spring-loaded valve.

Abstract: A valve for controlling fluid flow through a passage defined by a valve body or a piston includes a valve disc which abuts the valve body or the piston. The valve body or the piston defines a first land for supporting the valve disc, a second land for supporting the valve disc located radially inward from the first land and a support surface for the valve disc located between the first and second lands. This valve disc abuts the first and second lands and a clearance is defined between the valve disc and the support surface.

Abstract: A piston having a piston rod connected thereto is slidably fitted in a cylinder in which a hydraulic fluid is sealably contained. Extension-stroke and compression-stroke pilot type damping force control mechanisms are provided in the piston. Check valves are provided at inlet openings of back-pressure chambers (pilot chambers). Relief valves provided in the pilot chambers include orifice passages. When the direction of stroke of the piston rod is reversed, the pressures in the back-pressure chambers are maintained due to the check valves, and the back-pressure chambers are pressurized to a satisfactory level through the orifice passages.

Abstract: A damper includes a piston that carries a relatively compact control valve for controlling fluid flow through the piston. The control valve provides a variable amount of damping by regulating damper fluid flow between the extension chamber and the compression chamber of the damper during extension and compression strokes. Pressure regulation across the piston is controlled through a flow path as determined by the control valve. The damping force of the damper varies depending upon the loading conditions of the vehicle. The control valve is air pressure actuated to adjust the damping force and control the flow of fluid in the flow path. The piston and rod assembly include unique features such as a seal plate design, and spring retainer that aid in the efficient and reliable assembly in a commercial production setting.

Abstract: A hydraulic shock absorber includes a cylindrical housing within which a piston assembly is slidably received. The piston assembly includes a piston element connected to a piston rod and adapted to divide the interior of the housing into compression and rebound chambers. The piston element has compression and rebound passages to provide fluid communication between the compression and rebound chambers. A valve assembly includes a first valve disc positioned on the lower side of the piston element, and a second valve disc retained on the first valve disc. The second valve disc includes apertures arranged in a circumferentially spaced relationship and selectively opened and closed by the first valve disc. A third valve disc is retained on the second valve disc and has notches arranged in a circumferentially spaced relationship. The notches cooperate with the apertures to collectively form ports. The ports are communicated with the compression chamber.

Abstract: A device for increasing shock absorption by hydraulic means in the terminal section (19 & 27) of hydraulic shock absorbers with a shock-absorption piston (3) that divides the shock absorber into two compartments. The width of a channel that conveys hydraulic fluid through the piston is reduced by partly blocking the access of fluid thereto. The access comprises several individual accesses that do not mutually communicate. To ensure precise and constant increased shock absorption in the vicinity of the buffers, one or more individual accesses are completely blocked.

Abstract: A shock absorber includes a piston assembly having a compression valve assembly and a rebound valve assembly. One of the valve assemblies includes a free floating port blocker disc disposed in a pressure chamber. The blocker disc allows for the low speed bleed flow of fluid in one direction but restricts the low speed bleed flow of fluid in the opposite direction.

Abstract: Damping valve comprising a damping valve body with at least one flow-through channel, the outlet of which is covered at least by an elastic valve disk, which is pretensioned against the damping valve body at least indirectly by a spring, where at least one support disk of smaller diameter is provided on the elastic valve disk, facing the spring, this support disk not executing any elastic movement, the spring exerting its force in the area radially outside the support disk.

Abstract: A valve spool for a suspension damper comprises a body portion and a bridge connected to the body portion. The body portion has an upper edge, and the bridge extends at least partially beyond the upper edge of the body portion.

Abstract: A shock absorber includes a piston assembly having a compression valve assembly and a rebound valve assembly. One of the valve assemblies includes a free floating port blocker disc disposed in a pressure chamber. The blocker disc allows for the low speed bleed flow of fluid in one direction but restricts the low speed bleed flow of fluid in the opposite direction.

Abstract: A pilot chamber is formed at the back of a disk valve for each of the fluid flow systems for the extension and compression strokes. Damping force in a low piston speed region is controlled with a pressure control valve. The valve opening pressure of the disk valve is controlled by varying a pilot pressure introduced into the pilot chamber from a cylinder's hydraulic fluid chamber through a cut portion in a piston bolt and an orifice groove formed in a fixed member supporting the disk valve, thereby controlling damping force in a high piston speed region. A sharp pressure change occurring when the stroke direction of a piston rod changes is attenuated by the restricting action of the orifice groove so as not to be readily transmittable to the pilot chamber.

Abstract: A suspension damper or shock absorber for a vehicle suspension system includes a piston assembly across which damping fluid is metered to control relative movement between the vehicle body and chassis. The piston assembly includes a piston plate in which a first set of openings are provided for fluid communication during the rebound stroke of the piston assembly and a second set of openings for communication of damping fluid during the opposite compression stroke. A wall circumscribes the first set of openings to define a recess receiving damping fluid from the first set of openings. A valve disc engages the wall and opens at a predetermined pressure differential. At pressure differentials less than the predetermined pressure differential, highly restricted flow is permitted through a bypass passage formed by a coined depression in the rim of the wall having a continuously curved, preferably semicircular cross section, to provide damping for low level inputs.

Abstract: A shock absorber includes a rebound valve assembly which performs the flexing disc function normally required for allowing the passage of fluid from one side of a piston assembly to the opposite side during the stroke of the shock absorber. The rebound valve assembly also incorporates a blow off function which increases the fluid flow through the piston when the fluid pressure being exerted upon the rebound valve assembly exceeds a specified level. The blow off feature protects both the shock absorber as well as the suspension system into which the shock absorber is assembled.

Abstract: The flow of a hydraulic fluid, which occurs under a sliding movement of a piston in a cylinder, is directly controlled by virtue of an extension-stroke pressure control valve and a compression-stroke pressure control valve. At the same time, the pressure in a back pressure chamber is varied, to thereby adjust the valve opening pressure for a main disk valve. This enables control of a damping force over a wide range. In each of the extension-stroke and compression-stroke pressure control valves, a thrust is generated in a slider due to a difference in pressure-receiving areas between a stepped portion of the slider and a sub disk valve in a valve chamber. The valve opening pressure is controlled, according to the balance between the thrust of the slider and a thrust of a proportional solenoid. By reducing the difference in the pressure-receiving areas in the valve chamber, the load applied to the proportional solenoid can be reduced.

Abstract: Disclosed is a vibration damper with a damping valve having a reversing valve. The reversing valve has valve body having at least one passage opening with a cross section therein; a valve plate at least partially covering the passage opening and a reversing plate having at least one meandering shaped recess in the vicinity of the cover surface, and a circumferential section, wherein the recess has a starting point and an end point which bound the circumferential section the reversing plate is adapted to control the cross section of the passage opening as a function of flow direction. The valve includes a spring section extending in a circumferential direction and having at least one cover surface and a clamping surface which prestresses the reversing plate outside of the spring section and clamping surface against the reversing valve. The cover surface is aligned with the passage opening, and the circumferential section bounds the spring section.

Abstract: A continuously variable single-tube shock absorber operating according to the skyhook principle and having bidirectional control valves comprising a working cylinder, a piston with piston rod which is movable therein, openings cut out in the piston, spring-loaded shock absorber valves, fitted on either side of the piston, in order to shut off the openings until a certain fluid pressure has been reached, exciting chambers fitted on either side of the piston and each bounded by a stationary disc, a piston skirt which can be slid around such a disc, and a spring-loaded shock absorber valve. The exciting chambers are in communication with a bore in which the pressure is controlled by a control mechanism. Bores through which fluid can flow into the exciting chambers are provided in the stationary discs.

Abstract: The piston with a valve for a hydraulic damper tube, comprises a piston body (116) having a fluid passage (112) interacting with a floating valve element (115) for controlling in both directions the amount of fluid flowing through the passage. The floating valve element includes a spring washer (115), the deflection (f) of which in the free state is between approximately 0.1 times and approximately 2 times the thickness (e) of the washer.

Abstract: A valve assembly for a fluid vehicle damper having a cylinder with a valve body is provided. The valve body has an outer surface adjacent to an interior wall of the cylinder and includes first and second opposing surfaces. The valve body defines first and second fluid chambers within the damper, which are adjacent to the first and second surfaces, respectively. Inner and outer annular seats extend from the first surface and define an annular channel therebetween. At least one fluid passageway is connects the annular channel and second surface for providing fluid communication therebetween. A high speed bypass valve assembly is attached to the valve body and is movable between an open position and a closed position adjacent to the annular seats. An orifice disc is interposed between the annular seats and the high speed bypass valve assembly for providing low speed bypass of fluid from the second chamber to the first chamber when the high speed bypass valve assembly is in the closed position.

Abstract: A shock absorber has a pressure tube with a piston assembly slidably disposed within the pressure tube and attached to a piston rod. The piston assembly divides the pressure tube into an upper working chamber and a lower working chamber. The piston assembly includes a compression and a rebound valve assembly. The piston assembly also includes a housing attached to the piston rod within which is slidably disposed a piston to define a closed chamber. The closed chamber is in communication with one of the working chambers through a passageway extending through the piston rod. The housing and piston provide two stage damping in rebound and compression with a smooth transition between soft and firm damping.

Abstract: A damper including a cylinder, opposite end walls in the cylinder, an elongated shaft mounted for axial movement in seals in the end walls, a piston head on the shaft between the end walls, fluid-tight bellows mounted in sealed relationship between the shaft and the end walls, fluid in the cylinder and in the bellows, and flexible washers mounted between the shaft and the end walls for maintaining the shaft centered in the seals. The damper can function as a snubber when it utilizes a valved piston head.