Piston valve detail (e.g., seat design, structural arrangement, metering element)

A shock absorber of the direct acting hydraulic type is disclosed as comprising a reciprocable piston having a piston body, the piston body being formed with first and second sets of spaced flow ports, the sets of flow ports being concentrically oriented with the first set being spaced radially inwardly...     

A shock-absorber piston of the kind having diametrically opposed valve ports which are adapted to be obturated by a resilient valve plate which can be deflected to an open position against a supporting plate. The valve plate and supporting plate are at least partly accommodated within a groove formed...     

A shock isolator wherein a piston is movably mounted within a compressible solid chamber formed within a housing, the piston including first passages and second passages, the compressible solid material to be extracted through said first passages during an extension of the piston, the compressible solid...     

A vehicle suspension system for use in operatively supporting the road engaging wheels on an automotive vehicle, the suspension including a pair of suspension struts each of which includes an elongated tubular pressure cylinder, a valved piston reciprocally disposed within the cylinder and connected...     

A shock absorber for a motor vehicle suspension includes a piston construction having flow control valving that becomes more restrictive during the life of the shock absorber to compensate for the reduction of friction damping in the suspension during usage. The piston valving includes a flow control...     

A hydraulic dashpot having a pressure tube with a port defining a metering orifice through which fluid is metered upon application of impact forces to a piston assembly slidable in the pressure tube, and wherein the pressure tube is rotatable for adjusting the position of the orifice relative to a spiral...     

A shock absorber for providing a linear decelerating force to a machine part by means of a piston which forces fluid through a series of orifices formed by the coaction of holes in the piston cylinder and grooves formed on the internal diameter of a sleeve which fits over the cylinder. One form of groove...     

A shock absorber has expansion and compression damping characteristics readily adjustable, if required, to different extents. In one preferred form, it includes an adjustable orifice associated with a piston, and the orifice includes an annular flexible valve element and a valve-seat member engageable...     

A fluid vibration damper, such as, a shock absorber includes a cylinder and piston combination in which the piston head travels through a fluid-filled cylinder and has fluid bypass openings in its external surface forming one or more recesses of predetermined cross-sectional configurations and sizes...     

A hydraulic shock absorber including a piston disposed within a hollow cylinder in movable position responsive to a shock applied thereto, the piston defining a hollow vortex chamber therein, the vortex chamber being communicated with fluid chambers defined in the hollow cylinder to introduce a working...     

A hydraulic damper includes coaxial inner and outer tubes, a piston working in the inner tube and partitioning the interior thereof into first and second liquid chambers, a piston rod secured to the piston and extending through the first liquid chamber to the outside of the damper through upper ends...     

A gas spring for a hatch type door is disclosed, which comprises a cylinder, a piston received in the cylinder to divide the same into first and second chambers, a piston rod connected to the piston, a first device for providing a passage between the first and second chambers only when the piston moves...     

The shock absorber having a piston reciprocatingly disposed in a cylinder and sized small enough to permit a compact construction. The piston defines therein a vortex chamber with a maximum radius. The vortex chamber communicates with fluid chambers defined in the shock absorber via vortex passages formed...     

A hydraulic damper comprising a tube with a bottom end thereof closed for containing hydraulic oil therein, a piston slidably fitted in the tube and partitioning the tube into upper and lower chambers which are filled with oil, a piston rod having one end thereof being secured to the piston by a hollow...     

Single tube vehicle suspension strut with built-in shock absorber in which the piston rod is formed from tubing that provides a reservoir for shock absorber fluids and further featuring this type piston valving with the deflecting spring discs and cooperating metering pin construction which can readily...     

In the illustrative embodiments of the invention disclosed, the piston unit of a gas spring incorporates a meander-shaped fluid passage for interconnecting the working chambers on either side of the piston unit so as to dampen movement of the piston rod relative to the cylinder. The meander-shaped passages...     

A shock absorber comprises a cylinder and a piston rod passing through at least one end of the cylinder. A piston unit is mounted on the piston rod and divides the cavity within the cylinder into two working chambers. A damping fluid is contained within the cylinder. The working chambers are interconnected...     

A series of hydraulic shock absorbers all using the same piston. This is attained by giving no damping function to the liquid passages in the pistons, by which all pistons can be provided with an equal number of passages with a fixed, relative large cross-section. Thus, all pistons are equal. The damping...     

A hydraulic damper includes a cylinder, a piston working in the cylinder and partitioning the interior thereof into two liquid chambers, two valve discs provided respectively on opposite end surfaces of the piston, two sets of passages opening respectively in opposite end surfaces of the piston to cooperate...     

A shock absorber has a piston which comprises upper and lower members. The upper and lower members are fixedly assembled to define therein the vortex chamber. The piston has vertically-extending channels on the periphery thereof to define the vertical section of the vortex passages together with the...     

A bidirectional relief valve is provided which has a slidable valve element provided with first and second groups of ports which are positioned on opposite sides of a fixed port in the valve body when the slidable valve element is in a neutral position. The valve element may be moved in either direction...     

A piston assembly for a shock absorber includes a first set of one or more ports, controlled by two valve mechanisms, which conduct fluid only during the rebound stroke of the piston. A second set of ports, controlled by a single valve mechanism, conducts fluid during all compression and rebound strokes....     

An hydraulic energy dissipater with multiple working ratios, of the telescopic type, comprising a member with a variable cross-section, penetrating into a bore provided on the bottom of a piston and into a chamber provided inside the rod of the piston, which controls, as a function of its position with...     

A piston assembly for a shock absorber includes a first set of one or more ports controlled by two valve mechanisms, a second set of ports controlled by a single valve mechanism, and a third set of ports uncontrolled by any valve mechanism. All three sets of ports conduct fluid during the compression...     

The piston cylinder type damper comprises a cylinder connected to either member of the pair of a main body and an openable object, and a piston connected to the other member of the pair and adapted to fit into the cylinder and the piston incorporates therein a check valve adapted to allow the air in...     

In a cylinder piston device two working chambers on both sides of a piston are interconnected by a fluid passage. This fluid passage includes in series a first passage section and a second passage section. The first passage section comprises a first bore and a second bore in parallel. The first bore...     

The present invention provides a shock absorber of monotube or twin-tube configuration wherein the piston within the shock absorber includes an electromagnetically operable bypass valve, the electromagnetically operable valve being controlled remotely from the outside of the shock absorber via an electrical...     

A hydraulic shock absorber exhibiting a constant vibration damping force. The shock absorber is provided with a deep groove formed on an upper surface of a piston in a circle where piston ports formed through the piston lie and communicated with the piston ports. The groove has an outer peripheral wall...     

A vibration damper for vehicles is described, the damper curve of which is required to be arbitrarily variable, to enable the damping to be adapted optimally to driving conditions. For this purpose, the invention has a vibration damper in which a regulating member actuable by an actuating device can...     

An air pressure shock absorber for smoothly stopping a moving object reciprocated by a rod in an air pressure cylinder. The shock absorber absorbs and reduces the internal pressure of a chamber in the cylinder to smoothly stop the moving object by the communication of air compressed in the chamber to...     

A pneumatic spring counterbalance extensible link including a closed end cylinder with an end connector a piston and rod assembly within the cylinder and maintained therein by the crimped over end portion of the cylinder retaining a rod bushing and rod to cylinder seal. The cylinder is pressurized prior...     

A valve structure according to the present invention is used for a hydraulic buffer provided with a member for partitioning the interior of a cylinder into two liquid chambers and having a plurality of ports for affording communication between both liquid chambers. The valve structure includes a valve...     

A shock-absorber is designed to be used in particular with a motor cycle or a motor car. The shock-absorber is so arranged as to permit the variation of the shock-absorbing capacity or the resistance of the shock-absorber by use of control impulses from an external computerized unit. The shock-absorber...     

A shock absorber with a variable damping characteristic has a piston which is reciprocable in a cylinder to divide the oil-filled interior of the cylinder into two chambers. The chambers are connectable to each other by way of several passages including a first set for permitting the flow of damping...     

A hydraulic device for controlling the knee-joint function in a leg prosthesis has a cylinder which is divided into first and a second cylinder parts adapted to be fixed to the lower leg of the prosthesis, and a piston rod which carries one piston in each cylinder part and is fixed to the upper leg of...     

A piston-cylinder type oil damper includes a cylinder containing oil, a piston inserted within the cylinder for dividing the interior of the cylinder into a head chamber and a rod chamber, a rod passing through the rod chamber and projecting out of a rod end of the cylinder, a cover slidably penetrated...     

An elongation type oil damper includes a cylinder containing oil in the inside, a hollow plunger slidably fitted in the cylinder, containing oil in the inner space thereof and projecting from a rod end of the cylinder for undergoing elongation and contraction strokes, and a floating piston inserted in...     

A frictionless hydraulic damper having a cylinder and a piston head and piston rod connected to the piston head, with the piston head dividing the cylinder into chambers on opposite sides thereof and with the piston rod extending beyond the cylinder, and with sealed bellows extending between the end...     

A motion-damping apparatus is proposed which has a shock absorber disposed between a vehicle axle and a vehicle body. A piston that is supported on the vehicle body via a piston rod is movably supported in an inner jacket tube of the shock absorber. The piston divides work chambers filled with an electrorheological...     

A shock absorber includes a piston for partitioning the interior of a cylinder into two liquid chambers while affording communication between both liquid chambers through a plurality of ports, and a valve body biased toward the piston for opening and closing the ports. The piston has a ring portion which...     

The invention relates to shock-absorber pistons which have a piston body mountable on a piston shaft, the piston body having on both faces a circumferential chamber and these chambers being covered by valve spring disks which rest on circumferential shoulders around the circumferential chambers. The...     

A variable rate shock absorber having the interior of a working cylinder divided by a piston into an upper and lower working chamber. The lower working chamber is connected to a reservoir by a bi-directional valve member. A solenoid valve housed in a hollow piston rod has an actuated state connecting...     

The invention discloses a lifting telescoping tube which comprises a first tube receiving a pressure liquid, a second tube filled with a pressure gas, a first piston affixed to one open end of the second tube having a first through-passage and a second through-passage intercommunicating the first and...     

A hydraulic damper has a valve mechanism adapted to generate a damping force during extension and contraction strokes of the damper. The valve mechanism includes a disc valve assembly consisting of a main disc valve for generating a damping force and an orifice for generating a damping force in low operation...     

The piston of the damper, which is of the piston-and-cylinder type, has therein at least one fluid passageway, a pair of fluid inlet/outlet ports opening from one end of the piston and communicating with the passageway at spaced locations along its length, an outlet/inlet port opening from the opposite...     

An adjustable fluid amplified shock absorber including a casing having a chamber, a piston rod slidable in the casing, a piston head mounted on the piston rod within the chamber, an adjustable channel located between the piston head and piston rod for providing different levels of fluid amplified flow,...     

A shock absorber useful in motor vehicles which includes a piston inside of which an entire quantity of a damping fluid exchanged between two work chambers flows via a throttle cross section the size of which is defined by an electromagnetic adjusting device comprising primarily a magnet coil and an...     

A hydraulic shock absorber has a disk valve assembly which is formed by successively stacking up a first disk valve having arc-shaped or circumferentially extending opening provided therein at positions close to the inner periphery thereof, a second disk valve having notches which extend from the outer...     

A shock absorber for use in motor vehicles which includes a piston within a packet, inside the piston the entire quantity of the damping fluid exchanged between two work chambers flows via a throttle cross section the size of which is defined by an electromagnetic adjusting device comprising primarily...     

A shock absorber is provided a piston stroke dependent variable shock absorbing characteristics by a first and second flow restrictions associated with a piston. The first and second flow restrictions are arranged in a fluid path for communicating first and second working chambers defined within a shock...     

An improved isolation system for time responsive attenuation control led electromechanical valve assembly comprising the piston of motion between spaced members is provided having a remotely actuator of a fluid damper for generating motion attenuating forces. The piston valve assembly employs a moving...     

An impact damper for a motor vehicle comprises two fluid chambers. These fluid chambers are interconnected by a fluid passage. In case of an impact of the motor vehicle against an obstacle, the fluid flows from one fluid chamber to the other fluid chamber through the throttled passage. If the impact...     

A shock absorber comprises a tubular working cylinder (12) to be mounted on a suspended part of a vehicle, with a piston rod assembly (26) received slidably in the working cylinder (12) having an end (28) to be mounted on a fixed part of the vehicle. The piston rod assembly (26) has at its free end a...     

The invention consists of a novel tilt damper equipped with two oil chambers; one in the piston-rod extended position and the other in the piston-rod retracted position, which are respectively connected to a gas chamber through an oil passage where a relief valve and a check valve are provided. These...     

A longitudinally controllable adjustment device, in particular a gas spring partially filled with a fluid has a piston disposed on a piston rod. In order to achieve simple manufacture and assembly and high operational safety, a valve housing for receiving a valve is provided on the piston rod. Further,...     

In an illustrative example, an oscillation damper for damping the steering movement of the handle bar of a motorcycle comprises a cylinder and a piston rod axially movable with respect to the cylinder. A damping piston is provided at the inner end of the piston rod and divides the cavity within the cylinder...     

The bidirectional valve assembly provides for selection of retraction and extension damping characteristics which can accommodate relatively large separation of damping curves. Two cooperable valve discs or ring members are provided which function in unison to resist fluid flow in a first fluid flow...     

Stabilizer device for motor vehicles including a torsion bar, an actuator having a piston and two cylinder chambers on both sides of piston, a first and a second fluid passages for connecting said two cylinder chambers, respectively, a solenoid changeover valve provided in first fluid passage. A actuator...     

A shock absorber with a variable damping characteristic has a piston which is reciprocable in a cylinder to divide the oil-filled internal space of the cylinder into two chambers. The chambers are connectable to each other by one or more passages so that oil can flow between the chambers in response...     

A sealing ring (10) includes a plurality of circumferentially spaced axially directed projections (20) on one radial face thereof. In use, the sealing ring is located within a seating groove which is wider than the spacing between the radial faces a (11,12) of the sealing ring, the projections (20) holding...     

An electro-rheological shock absorber. The invention comprises a generally cylindrical inner casing holding an electro-rheological fluid; a reciprocating arm means attached at one end of the cylindrical casing; a dampening plunger member coupled to said arm and extending into said electro-rheological...     

A hydraulic dashpot for supporting pipes or similar loads comprises a cylinder having a piston mounted for displacement therein, the piston setting-off the cylinder chambers which are in fluid communication with a fluid storage chamber, and the piston having an inner chamber housing a valve seat body...     

A hydraulic shock absorber comprising a cylinder, a partition member for partitioning the interior of the cylinder into two chambers and a damping force generating mechanism for regulating the oil flow through a communication passageway formed through the partition member and connecting the two chambers...     

A suspension arrangement for use with aircraft landing gear, including an upper strut, a lower strut that is assembled with and telescopes relative to the upper strut and an oil reservoir within the struts. An adjustable valve assembly includes two interacting relatively movable members which divide...     

In a damper for a steering device of a motor vehicle and more particularly a motor cycle a piston rod is axially movable with respect to the cylinder. The piston rod is provided with a piston inside the cylinder. The piston is provided with axial bores. The axial bores open into valve seat faces of the...     

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...     

A hydraulic shock absorber includes a cylinder, a piston axially slidably fitted in the cylinder so as to divide the interior of the cylinder into a first cylinder chamber and a second cylinder chamber, and a damping force generating mechanism mounted on the piston for generating damping force by controlling...     

A damper includes a cylinder, a partition member for partitioning the interior of the cylinder into two liquid chambers, an orifice for generating a damping force by flow of liquid, and a bypass path affording communication between the two liquid chambers. The damper further includes a mass body attached...     

A bicycle shock-absorbing apparatus comprises an inner tube, a valve device, and an outer tube. The inner tube is inserted into the outer tube, with the valve device disposed at the bottom thereof to control the flow of damping oil between the tubes: upward therethrough into the inner tube when the bicycle...     

A cylinder type air damper includes a cylinder having at least one rib projecting radially inwardly and extending in the axial direction, a piston inserted for reciprocation within the cylinder and axially dividing the interior of the cylinder into a front compartment and a rear compartment. An exhaust...     

A pressure-actuated valve which includes an effective pressure face by which the valve is opened, the face on which the pressure difference that opens the valve acts is completely independent of an openable flow opening. The effective pressure face and the openable flow opening can be selected arbitrarily...     

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...     

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...     

A miniature shock absorber including an outer tubular housing, an inner tubular housing positioned within the outer tubular housing to define a pressure chamber within the inner housing and an annular accumulator chamber between the housings, a piston mounted for movement in the inner tubular housing,...     

A variable damping force shock absorber comprises a pressure cylinder forming a working chamber having first and second portions operable to store damping field. A valve is provided to control a first flow of damping fluid between said first and second portions of said working chamber during compression...     

A hydraulic shock absorber for use in a suspension system of a vehicle has the flow of a hydraulic fluid, induced in a hydraulic fluid passage providing communication between two cylinder chambers by the sliding motion of a piston in a cylinder, controlled to generate a damping force, thereby making...     

A two-stage shock absorber comprises a casing having a low level damping piston rod therein an end portion of which has two spaced apart flanges thereon with a low resistance fluid path formed therebetween. A floating ring piston is slidingly seated about the piston rod between the flanges and has high...     

A hydraulic damper has a dashpot piston reciprocating in a cylinder bore. Piston rods extend axially from both sides of the piston. Sealing structures at both ends of the cylinder connect to the cylinder and sealingly engage the piston rods to form two symmetrical hydraulic working chambers divided by...     

A shock absorber for cycles which is adapted to be coupled to the fork of a cycle frame and is provided with an oil circulation system which is controlled by the driver through a lever which controls a stabilizing spring controlling the oil flow from one cylinder to another cylinder of a shock absorber....     

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...     

A variable damping shock absorber is disclosed. The shock absorber has a two-wire electrical lead extending into the piston rod. The electrical energy provided by the lead drives a drive motor, which rotates in alternating directions depending on the setting of an internal switch that switches upon occurrence...     

A hydraulic damper is disclosed which has a contraction phase one-way passage way which allows a flow of damping fluid in contraction phase, an extension phase one-way passage way which allows a flow of damping fluid in extension phase, and a valve element in the form of a hollow control rod. The valve...     

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...     

A piston in cylinder shock absorber having a hollow piston rod attached to the piston and a central pipe extending within the piston rod and piston receiving limited flow upon stroking of the piston. A first damper valve creates a variable flow resistance from a reservoir when the piston moves outwardly...     

An oscillation damper is provided with a by-pass that includes a by-pass valve. The by-pass valve is switchable between an open position and a closed position. When the by-pass valve is moved between the open and closed positions, the rate of change of the cross-sectional area of the by-pass valve during...     

In the disclosed hydraulic shock absorber, damping force characteristics are adjusted in accordance with the frequency of stroke, and the damping force is made small at the time when the directions of stroke are changed from one to the other. Cylinder upper and lower chambers are communicated with each...     

The invention provides a hydraulic shock absorber for controlling an attenuating force in a very low speed range and a medium or high speed range of the speed of a piston. A leaf valve for the high speed range and another leaf valve for the medium or high speed range are disposed for opening and closing...     

A valve for a hydraulic damper comprising a flat circular disc(s) with a central axial opening wherein the disc(s) has a spring characteristic tending to maintain the disc in a flat shape and tending to return the disc(s) to the flat shape when forces deflect the disc(s) from the flat shape, and a disc...     

A shock absorber has an arrangement for bringing about different kinds of damping characteristics, in response to external controls and independently of how the piston speed varies. The shock absorber comprises a piston which works in a cylinder (2) and which has a passage between upper and lower sides...     

An infinite hydraulic check for use with a door that maintains the door in any position until an appropriate check effort is applied to release the door from the position. The check includes an annular needle cavity with a closed first portion and a second portion, the second portion including a by-pass...     

An adjustable speed gas spring primarily adapted for use has a part of a door closing mechanism. The gas spring includes a piston assembly which is disposed within an elongated fluid chamber and which upon relative rotation of the shaft with respect to the tubular body, permits the user to adjust the...     

A twin-pipe shock absorber comprises a working cylinder (1), a piston (4) which is movable in the cylinder and has a passage and upstream valve (13, 14, 15), and external pipe (2) which is fitted around the working cylinder having an oil tank (3) formed therebetween, a disc (7) having a passage (16)...     

A pneumatic door closer has an elongated cylinder with a bore extending axially thereof and end walls, and a piston is slidably reciprocable within the bore. The piston is integrally fabricated of a synthetic resin with a generally circular cross section, and it has a circumferential groove adjacent...     

A hydraulic control system provides various internal mechanisms for the control of the internal resistance of the telescoping cylinders of the system. Various devices and principles are provided for the external or remote adjustment of the internal resistance control mechanisms of the cylinders. In addition,...     

A piston post (54) for use in a damper (10) comprising a pressure cylinder (48) having a working chamber (50) with first and second portions. The piston post (54) has a first flow passage (200) fluidly communicating with the first portion of the working chamber (50). In addition, the piston post (54)...     

A shock absorber comprising an outer tube; an inner tube positioned inside the outer tube; a rod guide closing one end of the inner tube and the outer tube; a compensation valve assembly closing the other end of the inner tube; the other end of the outer tube being closed; a piston assembly slidably...     

Shock absorber with adjustable damping force, comprising a pressure tube filled with damping medium, in which a piston on an axially movable piston rod divides a work chamber into a piston-side and a non piston-side chamber, whereby there is a damping medium flow between the two work chambers, which...     

The construction of the shock absorber disclosed in DE-A-2945015 is independently adjustable in two directions however, the adjustment only leads to a variation in the pre-spring tensions in a fixed combination of valves. Only the magnitude of the damping forces may be adjusted, however not the characteristic....     

A hydraulic damper of the monotube type in which the floating piston includes a first valve allowing fluid flow from the compression chamber to the compensation chamber when fluid pressure in the compression chamber exceeds that in the compensation chamber by a predetermined amount, and a second valve...     

An adjustable speed gas spring primarily adapted for use as a part of a door closing mechanism. The gas spring includes a piston assembly which is disposed within an elongated fluid chamber and which upon relative rotation of the shaft with respect to the tubular body, permits the user to adjust the...