Abstract: A fluid-filled vibration damping device including a partition having a housing area, and a movable film housed in the housing area while including a central retainer held by the partition and spoke-shaped retainers extending radially outward from the central retainer. A first surface of the movable film is overlapped on a wall inner surface of the housing area. An elastic deformation zone provided circumferentially between the spoke-shaped retainers is allowed to deform in a direction away from the wall inner surface, and includes a cushion ridge projecting from a second surface of the movable film while extending radially outward from the central retainer. A height of the cushion ridge is varied in a direction of extension such that a timing of contact with an opposing wall inner surface in the housing area varies depending on an amount of deformation of the elastic deformation zone.

Abstract: A shock absorber is provided having a cylinder, a piston rod, a piston body, and a valve. The cylinder is configured to receive fluid. The piston body is connected to the piston rod and is configured to reciprocate within the cylinder between a compression chamber and a rebound chamber. The valve is provided by the piston body having a fluid flow port, a valve seat, a circumferential valving element, and a spring configured to urge the valve body into the valve seat. A primary damping valve and an auxiliary damping valve are also provided.

Abstract: A shock absorber includes a compensator and a variable volume chamber. The compensator contains a compressible fluid and the variable volume chamber contains a substantially incompressible fluid. During a compression stroke, an increase in the volume of the incompressible fluid in the variable volume chamber compresses the compensator and thereby increases the available volume in the variable volume chamber.

Abstract: A damper assembly includes a pressure tube defining a chamber. The damper assembly includes a body supported by the pressure tube. The body has a first surface and a second surface opposite and spaced from the first surface along an axis. The body defines a passage extending from the first surface to the second surface. The damper assembly includes an orifice disc movable from an unflexed position to a first flexed position and movable from the first flexed position to a second flexed position. The orifice disc in the unflexed position is spaced from the first surface radially outward and radially inward of the passage. The orifice disc in the first flexed position is spaced from the first surface radially outward of the passage and abuts the first surface radially inward of the passage. The orifice disc in the second flexed position abuts the first surface radially outward and radially inward of the passage.

Abstract: A hydraulic shock absorber including a housing and an absorber unit. The absorber unit is movable relative to the housing in the axis direction of an absorber unit middle axis A-A and includes a piston which is arranged on a piston rod and which subdivides the housing into a first and a second working space which is filled with damping fluid.

Abstract: Provided is a liquid-filled vibration isolator through which durability of an elastic movable body can be improved. In a case that a liquid pressure of liquid passing through a second orifice P2 is exerted to an outer circumference portion 12 of an elastic movable body 10, whole of the outer circumference portion 12 deforms so as to bend. Based on deformation of the outer circumference portion 12, a first valve portion 13 and facing surfaces 81c, 91c mutually contact or separate. Thereby, the communication state and the blocking state of the second orifice P2 are switched. Since it can be restrained that stress is concentrated in a part of the outer circumference portion 12 by wholly bending the outer circumference portion 12, cracks are less likely to occur in the outer circumference portion 12.

Abstract: In the present invention, a restriction passage (24) includes a first communication portion (26) that is open to a first liquid chamber, a second communication portion (27) that is open to a second liquid chamber, and a main body flow path (25) that is configured to cause the first communication portion (26) and the second communication portion (27) to communicate with each other, and in a portion of the main body flow path (25) connected to at least one of the first communication portion (26) and the second communication portion (27), a guide portion (43) that is configured to guide a liquid from the other of the first communication portion (26) and the second communication portion (27) to an opposed surface (34a) that is opposed to one of the first communication portion (26) and the second communication portion (27) in an inner surface of the restriction passage (24) is disposed.

Abstract: A pressure valve is configured to be selectively coupled to a vessel and includes a housing including a vent aperture configured to provide fluid communication between an internal cavity of the housing and ambient air surrounding the pressure valve, an accessory aperture configured to couple an accessory to the housing, and a seal seat positioned within the internal cavity fluidly between the vent aperture and the accessory aperture. The pressure valve includes a pressure control assembly including a seal configured to break a sealing engagement with the seal seat to provide fluid communication between the vessel and the vent aperture in response to a desired positive pressure being reached within the vessel. The seal is configured to break the sealing engagement with the seal seat to provide fluid communication between the vessel and the vent aperture in response to an operator moving an actuator of the pressure control assembly.

Abstract: An aircraft engine assembly has a front engine mount connecting an engine and a primary structure of a pylon comprising at least one front rod having at least three front link points. A first front link point is configured to connect the front rod and the front end of the primary structure. A second front link point is configured to connect the front rod and the core of the engine. A third front link point is configured to connect the front rod and the engine core and is offset relative to the second front link point in a horizontal transverse direction. The first front link point of the front engine mount is separated from the rotation axis of the engine by a distance greater than an exterior radius of the rear casing of the core of the engine at the rear link point of the rear engine mount.

Abstract: A furniture fitting includes a housing, a fluid chamber arranged in the housing, a damping fluid in the fluid chamber, a piston having an overload opening and displaceably arranged in the fluid chamber for performing a damping hub, and an overload safety device in the piston and having a closure element pressurized by a force storage member. The closure element blocks the overload opening of the piston below a predetermined threshold value of a pressure application to the piston, and unblocks the overload opening of the piston against a force of the force storage member above the predetermined threshold value. Due to the unblocking of the overload opening, a fluid-conductive connection between a high pressure side and a low-pressure side of the fluid chamber is unblocked. The closure element includes a throttle opening for passage of the damping fluid from the high-pressure side to the low-pressure side.

Abstract: A damping valve includes a damping valve body with at least one through-channel, the outlet cross section of which is at least partially covered by at least one valve disk. The at least one valve disk is preloaded by at least two star springs. Each star spring has a support ring and a quantity of radial spring arms. The support rings lie one on top of the other in the installed position. The star springs are layered in opposite orientation such that the spring arms of at least two adjacent star springs face in the same direction with respect to the valve disk, and this star spring package has an anti-rotation element in an assembled position.

Abstract: A valve includes a valve disc that partitions one chamber and another chamber. The valve disc includes annular bosses and seats at each of the one chamber side and the other chamber side, and an auxiliary seat at the other chamber side. The boss is formed to support leaf valves. The seats are formed on outer peripheral sides of the respective bosses. At least one of the seats is disposed to project with respect to the boss of the corresponding chamber side. An outer peripheral end of the seat on the one chamber side is disposed on an outer peripheral side with respect to an outer peripheral end of the seat on the other chamber side. The auxiliary seat is formed on an outer peripheral side of the seat, and have a height equal to or greater than that of the seat on the other chamber side.

Abstract: The hydraulic shock absorber includes a cylinder containing a fluid, a damper case positioned outside the cylinder to form a reserving chamber, a piston housed inside the cylinder, a piston rod supporting the piston, a rod guide covering one end of the cylinder, and a guide bushing provided with a through hole through which the piston rod penetrates. The rod guide has an outer circumferential groove formed by spacing apart at least a part of the rod guide from the cylinder in a circumferential direction of the cylinder for allowing the fluid to flow from inside of the cylinder to the reserving chamber, and has an inner circumferential groove for supplying the fluid into an inner circumferential gap between an inner circumferential surface of the guide bushing and an outer circumferential surface of the piston rod as the fluid flows through the outer circumferential groove.

Abstract: A vibration-damping device (10) includes a first attachment member (11), a second attachment member (12), an elastic body (13), and a partitioning member (16). Limiting passages (31, 32) are formed in the partitioning member (16), and the limiting passages (31, 32) include a first limiting passage (31) and a second limiting passage (32). An inner peripheral surface of the first limiting passage (31) is provided with flow changing protrusions (33, 34) that protrude toward an inner side in a radial direction of the first limiting passage (31) and that changes the flow of a liquid (L) that flows through the first limiting passage (31) in an axial direction of the first limiting passage (31). In a vertical cross-sectional view passing through an axis of the first limiting passage (31) and through the flow changing protrusions (33, 34), the first limiting passage (31) and the flow changing protrusion1 (33, 34) have symmetrical shapes with respect to the axis.

Abstract: A device according to the present invention comprises: a tubular body (2) and a first attachment means (6), a piston (30) provided with a rod (12) connected to a second attachment means (10), the piston (30) sliding inside the tubular body (2) and defining inside said body a working chamber filled with hydraulic fluid, an accumulator comprising a rigid shell (20) inside of which a separation means (40) is located, defining a compensation chamber (42) that is filled with hydraulic fluid and is in communication with the working chamber, and a chamber (47) filled with pressurized gas, the rigid shell (20) being a metal shell produced by means of welded assembly and the accumulator being made such as to obtain an entirely welded enclosure (47) containing the gas.

Abstract: Embodiments of the present invention provide significant firearm recoil force reduction and can be integrated within a traditional firearm stock. Such recoil shock absorbers include a body assembly, plunger assembly, and return spring. The body assembly includes a shock tube, cylinder end, and accumulator. The shock tube includes an opening at its distal end, the cylinder end is rotatably coupled to the shock tube, and the accumulator is coupled to the cylinder end. The cylinder end can be selectably/adjustably aligned with the shock tube opening, resulting in a selectable/adjustable orifice and a pathway from the shock tube to the accumulator. The plunger assembly is slidably coupled to the body assembly and includes a piston. The piston and the shock tube are in slideable relation such that when the plunger assembly is introduced into the body assembly the piston is introduced into the shock tube.

Abstract: A vibration isolator includes first and second mounting members; an elastic body connecting the mounting members; a partition member partitioning a liquid chamber in the first mounting member into a primary liquid chamber using the elastic body as a part of a wall surface thereof and a secondary liquid chamber; and a movable member housed in a housing chamber provided within the partition member, the movable member being deformable or displaceable in an axial direction of the first mounting member. The partition member includes communicating holes that extend from a portion of the partition member which is exposed to the primary liquid chamber or the secondary liquid chamber toward an inside of the partition member and are opened toward the movable member. The partition member is equipped with partition plate parts dividing the housing chamber from the primary liquid chamber and dividing the housing chamber from the secondary liquid chamber.

Abstract: A buffering device includes a cylindrical casing and a piston module movably mounted in the cylindrical casing. The cylindrical casing includes a base plate and a shielding piece pivotally attached to the base plate. An air inlet and an air outlet are defined in the base plate. A diameter of the air inlet is greater than that of the air outlet. When the piston module is moving towards the base plate, the shielding piece is rotated to a closed position to shield the air inlet by air pressure above the shielding piece. When the piston module is moving away from the base plate, the shielding piece is rotated to an open position to expose the air inlet by environmental air pressure.

Abstract: A shock absorber includes an annular outer seat protruding from a valve main body, an inner seat protruding inward of the outer seat of the valve main body, an intermediate seat disposed between the outer seat and the inner seat of the valve main body and protruding to surround an opening section of a passage, a first disk having a larger diameter than the outer seat and seated on the intermediate seat, a spring member configured to press the first disk toward the outer seat, a second disk stacked on the first disk, and a communication unit configured to bring the passage in communication with a space between the intermediate seat and the outer seat. The first disk starts to be pressed by the spring member to abut the outer seat while abutting the inner seat and the intermediate seat.

Abstract: Methods and systems for preventing vacuums within a snubber during a predetermined condition are disclosed. The snubber includes a body at least partially filled with fluid, a piston capable of sliding within the fluid in the body, a lockup valve that allows the piston to move freely under operating conditions and limits the motion of the piston under a predetermined set of conditions, and a reservoir positioned within the piston rod containing a reserve of fluid.

Abstract: A damper for damping a movement along a middle-longitudinal-axis, in particular for damping a seat in a vehicle, includes an outer housing extending along the middle-longitudinal-axis, a guiding and sealing unit closing a first housing end, a piston rod sealed by the guiding and sealing unit guided, an inner housing, which surrounds a working chamber, a damping fluid, a second housing end opposite the first housing end and a piston guided in the inner housing along the middle-longitudinal-axis and secured to the piston rod. The piston divides the working chamber into a first part-working chamber and a second part-working chamber. The piston includes at least one throughflow channel for connecting the chambers, an equalizing chamber arranged between the inner housing and the outer housing and a throttling channel integrated into the guiding and sealing unit. The throttling channel has a cross-sectional area comprising a length and an internal width.

Abstract: A valve assembly for a shock absorber includes a valve body defining a fluid passage. A valve disc engages the valve body to close the fluid passage. A fulcrum disc engages the valve disc at a first position and a second position radially outward from the first position. The fulcrum disc is designed such that the second position is closer to the valve body. In one embodiment, the fulcrum disc is concave with respect to the valve body.

Abstract: An active suspension system for a vehicle including at least one fluid operated ram having a cylinder and a main piston mounted therein for reciprocating movement, control means for controlling an equilibrium position of the piston in the ram in response to lateral acceleration of the vehicle in order to counter the effects of body roll of the vehicle, and wherein the ram includes shock absorbing means for permitting rapid movement of the piston from the equilibrium position when operating fluid in the ram is subjected to transient increases in pressure.

Abstract: A floating piston valve includes an annular valve body having a fluid passing hole formed therein, a pair of upper and lower valve discs respectively mounted on upper and lower sides of the valve body to generate damping force, a pair of upper and lower tripod type leaf valve springs respectively mounted on upper and lower sides of the upper and lower valve discs, and a pair of upper and lower coupling supports coupled to the valve body respectively at upper and lower sides of the upper and lower tripod type leaf valve springs. Each of the coupling supports includes an annular support section and a coupling section at least partially formed on an outer edge of the annular support section and is fastened to the valve body through a portion of an outer edge of the valve body.

Abstract: A hydromount assembly includes a first fluid chamber and a second fluid chamber that communicate with one another through an inertia track. The inertia track is interposed between the first and second fluid chambers, and is used as a fluid actuating plunger to move relative to at least one of the first and second chambers in response to vibration to pump fluid from the first chamber to the second chamber, and vice versa, through the inertia track. An opening extends through the first and second fluid chambers and the inertia track and receives a shaft therein. The inertia track is secured to the shaft so that axial movement of the shaft results in axial movement of the inertia track. Elastomeric portions of the hydromount may be differently tuned from one another. The center mount hydromount may be selectively assembled with a body mount, or the body mount integrated into the hydromount whereby the center mount arrangement increases the functionality of the damper.

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 with variable damping force, includes a cylinder filled with damping medium and in which a piston fastened to a piston rod axially moveably therein. The piston divides the working cylinder into two working spaces. The damping force for the directions of rebound and compression are influenced by nonreturn valves acting in the respective directions. A damping valve of variable damping action is additionally provided in series with each of the nonreturn valves so that the damping valve is active in both the rebound and compression directions.

Abstract: The present invention relates to a speed reducing device of a gas spring device. The piston is slidably moved in the cylinder in the state the piston is adhered to the inner wall surface of the cylinder, and a cutting recess is formed on the outer peripheral surface of the cylinder to easily move the gas in first and second chambers. A concentric gas passage is formed on the surface of the piston which makes contact with the upper washer, and includes another concentric gas passage. An inlet and outlet of the gas passage is opened towards the outer peripheral surface of the piston. A concentric gas passage is formed on the surface of the piston which makes contact with the under washer. The inlet and outlet of the gas passages is opened towards the bottom surface of an annular recess. The gas passage is connected by an axial recess which penetrates the piston.

Abstract: A damper includes a housing, a piston, and a magneto-rheological (MR) fluid. The piston is movably disposed within the housing such that the piston divides an interior of the housing into first and second cavities and a passage defined in the piston couples the first and second cavities. The passage includes at least a disk shape space within the piston defined between by two substantially parallel surfaces. The MR fluid damps motion of the piston by a flow of MR fluid through the passage, and a magnet produces a magnetic field within at least the disk shape space of the passage.

Abstract: A device for attenuating the amplitudes of impacts, especially against the wheel of a vehicle. At least one piston is accommodated in a housing and divides it into two attenuating spaces. The piston is attached to a piston rod and operates in conjunction with a component that handles smaller amplitudes. This component is either a diaphragm or a displaceable rigid disk that divides a space and communicates hydraulically with either the upper or with the lower attenuating space.

Abstract: Briefly, according to this invention there is provided a viscous fluid mount for interconnection between a vibrating body and a base. The viscous fluid mount includes a chamber, a high viscosity damping fluid contained within the chamber and a flow resistance device. Input energy from the vibrating body is dissipated by shear friction of the damping fluid moving parallel to the shear surface area of the flow resistance device.

Abstract: A two-stage shock absorber having a pressure tube within which a valve assembly is slidably disposed. A piston rod is attached to the valve assembly and extends out of the pressure tube. In a first embodiment, a ring which is slidably disposed within the pressure tube engages the valve assembly after a specified amount of movement of the valve assembly with respect to the pressure tube In both an extension and compression movement of the shock absorber. The engagement of the ring with the valve assembly reduces the fluid flow through the valve assembly to switch the shock absorber from soft damping to firm damping. In a second embodiment, the ring switches the shock absorber from soft damping to firm damping only during an extension movement.

Abstract: Briefly, according to this invention there is provided a viscous fluid mount for interconnection between a vibrating body and a base. The viscous fluid mount includes a chamber, a high viscosity damping fluid contained within the chamber and a flow resistance device. Input energy from the vibrating body is dissipated by shear friction of the damping fluid moving parallel to the shear surface area of the flow resistance device.

Abstract: An improved shock absorber for a vehicle suspension system that incorporates an internal damping arrangement that permits a smooth transition between first and second damping rates. The mechanism includes a metering rod that is mounted in such a way that it will self-adjust in its position relative to a bore extending through the piston rod. An arrangement is disclosed for mounting the pistons on the piston rod so as to permit control of their positions without necessitating threaded adjusting devices.

Abstract: A number of embodiments of tubular type shock absorbers that permit improved damping characteristics in both directions by providing a third fluid chamber that surrounds the central shock absorber portion which defines the normal first and second fluid chambers separated by a piston connected by a piston rod to one of the two suspended elements. An annular piston is connected to the piston rod and displaces fluid from the third fluid chamber through a shock absorbing arrangement for augmenting the shock absorbing action of the centrally positioned shock absorber. Several embodiments of reservoir arrangements are disclosed.

Abstract: A shock absorber includes an outer tube filled with hydraulic fluid and an inner tube that extends into the outer tube and that contains an appropriate amount of hydraulic fluid and high pressure air therein. A piston is secured to an open bottom end of the inner tube and is formed with a central through hole and a plurality of fluid passages which communicate the inner and outer tubes. The piston further has a bottom surface which is formed with concentric first and second annular grooves and an annular wall that separates the annular grooves and that is formed with a notch to communicate the annular grooves. The fluid passages extend into the first annular groove. The second annular groove has a depth that increases gradually from one side of the notch to an opposite side thereof. A control rod is disposed inside the inner tube and has a bottom end that extends through the central through hole of the piston.

Abstract: A hydraulic shock absorber includes a hollow cylinder which defines therein a fluid chamber filled with a working fluid, and a piston which is reciprocally disposed within the fluid chamber and divides the fluid chamber into upper and lower chambers. The piston is formed with fluid passages for establishing fluid communication between the upper and lower chambers. Each of the fluid passages is controlled by a disk valve assembly comprising a plurality of elastic disk plates, so as to introduce the working fluid from one of the upper and lower chambers to the other chamber when fluid pressure in one of the chambers is greater than a predetermined value. The disk valve assembly has a bypassing fluid passage which has a plurality orifices configured so as to gradually decrease fluid pressure and flow velocity of the working fluid passing therethrough.

Abstract: A restricted passage system is used in a vibration damping device, and comprises at least three cylindrical members concentrically arranged from each other at an interval and alternately serving as positive and negative electrodes and having a hole per each member in a position opposite to each other in diameter direction and insulation members fixed to upper and lower end portions of these members.

Abstract: A vehicular suspension system includes a liquid spring operatively interconnected between a vehicle frame and an associated wheel assembly to provide resistive spring and damping forces in response to relative vertical displacement between the frame and wheel assembly. The liquid spring includes a cylinder secured to the vehicle frame and having a compressible liquid-filled internal chamber in which a piston structure is reciprocally disposed and divides the chamber into bounce and rebound chambers. A rod is slidably and sealinqly carried by the cylinder for axial movement into and out of the chamber, the rod having an inner end anchored to the piston structure, and an outer end portion extending outwardly from the cylinder and secured to the wheel assembly. A flow passage extends through the piston and intercommunicates the bounce and rebound subchambers.

Abstract: Magnetorheological (MR) fluid dampers are optimized. Dimensional relationships involved in the flow of magnetic flux are related to an operational parametric ratio of magnetic flux density in the fluid to the flux density in the steel. A magnetic valve is utilized to change the flow parameters of the MR fluid and, hence, the operational characteristics of the damper. Several embodiments depicting improved piston designs, including spool as well as toroidal configurations, are disclosed. In addition, both single and twin-tube housing designs are presented.

Abstract: A double pumper mount useful as a front mount for an aircraft engine. A pair of fluid chambers are selectively interconnectable by one of a plurality of inertia tracks by use of an adjustable cylindrical member which has the tracks formed as generally helical grooves extending about the periphery of the cylindrical member. These inertia tracks have different flow characteristics so as to produce differing notch frequencies so as to attenuate different vibrational frequencies. A second embodiment has a single inertia track whose length can be altered by rotating the cylindrical member to change the point at which the ingress/egress port of the fluid chamber engages the circumferential portion of the inertia track.

Abstract: A shock absorber comprises a piston and piston rod assembly mounted for reciprocation in a cylinder, the piston dividing the cylinder into upper and lower chambers, a floating disk valve slidably disposed in a fluid reserve chamber of the piston for movement between first and second positions to selectively open and close fluid passages associated with the assembly to vary the resistance to damping fluid moving through the assembly and between the chambers, and a solenoid-plunger for regulating the flow of damping fluid between the chambers. The disk valve movement is controlled by the solenoid-plunger and when the disk is in a first position augments flow between the upper and lower chambers to provide "soft" compression and rebound strokes and when the disk is in a second position restricts flow between the upper and lower chambers to provide "firm" compression and rebound strokes.

Abstract: A pressure-operated valving arrangement for a piston assembly of the type used in a direct-acting shock absorber is disclosed. Bi-directional primary and secondary flow paths are provided for regulating the damping forces generated during both rebound and compression strokes. During rebound, a pressure differential generated across a moveable valve disc operates to regulate fluid flow from an upper to a lower portion of the shock absorber's working chamber. A pilot orifice in the valve disc and a bleed slot associated with a rebound blow-off assembly are sized to generate the desired pressure differential across the valve disc. Manipulation of the size ratio permits universality of design for economical shock absorber manufacture.

Abstract: An electrically adjustable shock absorber is disclosed which includes a piston-cylinder assembly with a shock absorbing device. An electrically adjustable cylindrical slide is arranged in a tubular extension which is attached to the piston and which affects the shock absorption device by closing off at least one fluid opening provided in the extension wall to the shock absorbing device.

Abstract: According to an illustrative example of this invention, the piston of a hydraulic oscillation damper is provided with a traction valve, i.e. a valve which is intended to damp the outward movement of the piston rod. This traction valve includes two valve discs and a valve member. The valve member is biased towards a closed position and urges the valve discs against a valve face of the piston. In response to a predetermined pressure difference between the two working chambers on both sides of the piston, a flow passage is opened by lifting the valve discs and the valve member from the valve face. Below said predetermined pressure difference, a preliminary restricted flow passage exists. This preliminary restricted flow passage extends in series across the radially inner circumferential edge of a first valve disc adjacent to the piston and through radially inner edge recesses and through radially outer edge recesses of a second valve disc adjacent to the first valve disc.

Abstract: A damping device which is disposed between an oscillating mass and a fixed structure. The device includes a rigid container, a first membrane forming the lid of the container, a low-viscosity liquid inside the container, an elastomeric diaphragm separating the space inside the container into two chambers, a second elastomeric membrane forming the base of the second chamber, and annular conduit with its two ends hydraulically connecting the first chamber to the second chamber for damping low frequency and high amplitude oscillations of the oscillating mass. The elastomeric diaphragm extends up to the annular damping conduit, and the diaphragm forms at least a portion of the conduit wall.

Abstract: A hydraulically damped resilient mounting having a housing that is closed off on opposite sides by resilient elastomeric elements to form an interior of the housing. A partition is disposed in the housing between the resilient elastomeric elements in such a way as to divide the interior of the housing into two chambers that are filled with damping fluid. The partition is provided with a flow passage so that the volumes of the two chambers can be reciprocally varied. The flow passage includes a hollow chamber that forms a large portion of the surface area of the partition. The flow passage also includes an at least nearly tangentially disposed inlet, in the outer peripheral region of a partition, to provide communication between one of the two chambers and the hollow chamber. The flow passage further includes an at least nearly axially disposed outlet, in the central portion of the partition, to provide communication between the hollow chamber and the other of the two chambers.

Abstract: A one-way damping valve mechanism in a hydraulic damper having a first hydraulic chamber defined in a cylinder, and a piston rod having an inner end on which there is mounted a piston slidably fitted in the cylinder, divides the first hydraulic chamber into a second hydraulic chamber and a third hydraulic chamber. The valve mechansim produces a damping force when the piston is moved in a prescribed direction to move working oil from the second hydraulic chamber into the third hydraulic chamber. The valve mechanism comprises a subvalve for defining a first hydraulic passage to generate a damping force when the piston moves at an extremely low speed in the prescribed direction, and a main valve for defining a second hydraulic passage to generate a damping force when the piston moves in a medium/high speed range in the prescribed direction.

Abstract: This invention is a liquid filled type vibration insulating device, wherein a partition member dividing a closed chamber into two liquid chambers is provided with a gas chamber isolated from both liquid chambers and a portion of the gas chamber adjacent to at least one of the liquid chambers is partly or wholly defined by a flexible diaphragm, and is to prevent the increase of dynamic spring rate in the vibration insulating device due to high frequency vibrations by absorption of vibration through deformation of a flexible diaphragm when high frequency, small amplitude vibrations are particularly transmitted to the device.

Abstract: A piston valving and seal mechanism is for a fluid shock absorbing device. A piston is mountable on a piston rod of the device. The piston has an outer periphery, rebound chamber face and compression chamber face. A piston seal is movably mounted in a groove where the piston rebound chamber face and outer periphery meet. The seal is adjacent compression passages in the outer periphery. A seal retainer plate along the piston rebound chamber face with a backing spring bias the seal. The plate is raised from the rebound chamber face and includes passages through the plate for fluid flow through the plate and into underlying recoil passages in the piston. The seal acts as a check valve for the compression passages. A separate recoil passage valve plate on the compression chamber face, with a backing spring, acts as a valve for the recoil passages.