Abstract: A vibration isolator of the type having opposed fluid filled chambers separated by a partition having an elongate inertia track passageway providing fluid communication between the chambers is provided with a decoupler disc and cage configuration which attenuates noise and minimizes leakage while providing a relatively low minimum dynamic stiffness at a predetermined high excitation frequency. The decoupler disc has an edge configuration which cooperates with its cage to permit flexure only about peripheral fulcrums. Decoupler disc displacement inwardly of its peripheral fulcrums is progressively arrested by shapes provided on opposite sides of the decoupler disc and confronting cage structure.

Abstract: It relates to a hydraulic antivibration support interposed between a chassis and a vehicle engine, comprising a working chamber A and a compensation chamber B filled with liquid and joined together by a throttled passage (6) constituted by a "column" in a circular arc hollowed in the annular seat (5.sub.2) of a central deformable partition (5.sub.1). To increase the number of oscillatory phenomena which can be damped in excellent manner by the "column" effect, there is provided at least one small hole (8) joining one of the chambers A to a point of the throttled passage (6).

Abstract: A fluid-filled resilient support structure including a first annular resilient member disposed radially outwardly of an inner sleeve, a pair of annular closure members closing opposite ends of an annular space between the inner sleeve and the first resilient member, a cylindrical member fitted on an intermediate portion of the inner sleeve, an orifice member spaced radially outwardly from the cylindrical member, a second annular resilient member between the orifice member and the cylindrical member, and an outer sleeve fitted on the outer surface of the orifice member. The orifice member has a radially outer portion sandwiched between upper and lower portions of the first resilient member in the axial direction. The orifice and cylindrical members and the second resilient member axially divide the annular space into two fluid chambers which are closed at the opposite axial ends of the first resilient member by the closure members. The orifice member has a circumferential groove formed in its outer surface.

Abstract: The mount has variable volume fluid chambers interconnected by fluid passageways and containing electrorheological fluid. Valves are arranged in series with a plurality of the passageways. Each valve has a flow area greater than that of the passageway in series therewith. Energization of a valve generates an electrical field effective to so increase the apparent viscosity of the fluid within the valve as to prevent fluid flow through the passageway in series with it. Selective energization of the valves, by suitable controls associated therewith, varies the frequencies at which fluid inertia forces cause the mount to undergo abrupt changes in dynamic stiffness. The valves may be located upon opposite sides of a central mount section through which the chamber connecting passages extend. Electrode elements of the valves are preferably so shaped as to minimize fluid drag and electrical concentration.

Abstract: A fluid-filled resilient bushing including an inner sleeve, a rubber insert secured to the outer surface of the inner sleeve, an orifice sleeve fitted on the rubber insert, and an outer sleeve fitted on the orifice sleeve. The rubber insert has a plurality of circumferentially spaced-apart pockets which are closed by the orifice sleeve, whereby a plurality of fluid chambers are formed. The orifice sleeve has a circumferential groove formed continuously in its outer surface so as to cover at least one full circumference of the orifice sleeve, and a plurality of radial holes which communicate at their outer ends with the circumferential groove and at their inner ends with the fluid chambers, respectively. The outer sleeve closes the circumferential groove in the orifice sleeve, so as to define a continuous circumferential orifice which communicates with the fluid chambers through the radial holes in the orifice sleeve.

Abstract: The invention relates to a two-chamber engine bearing, in particular for motor vehicles, which has hydraulic damping, the liquid-filled chambers of which have rubber elastic peripheral walls and are connected to each other by a line which is provided in the rigid, elastically-mounted intermediate plate. To improve the damping, the intermediate plate has, according to the invention, an extended cavity which has an approximately rectangular longitudinal cross-section in the area of the middle plane thereof, the length and width of the cavity being many times its height and the cavity being connected to the upper chamber at one end by a vertical passage and connected to the lower chamber at the other end by a corresponding passage.

Abstract: A shock absorber including a cylinder (501), a rod (502) slidably mounted in the cylinder, and a piston (506) fixed to the rod and slidable inside the cylinder. The piston divides the cylinder into two oil-filled chambers (508, 514) and there is a third chamber (518) in the rod and including air to act as a hydraulic spring. Shocks tend to move the piston along the rod away from its equilibrium position therein, and the hydraulic spring tends to return the piston to its equilibrium position. Damping is provided by variable aperture channels between the first chamber (508) and the other two chambers (514 and 518). The channels comprise orifices (509 and 510) in a cylindrical wall of the first chamber (508) which overlap orifices in a movable cylindrical valve plate (527). A control shaft (540) leading out along the axis of the shock absorber serves to rotate the valve plate and to move it in axial translation.

Abstract: A hydraulic damper includes a cylinder containing hydraulic liquid therein, a piston working in the cylinder and partitioning the interior of the cylinder into first and second liquid chambers, a piston rod secured to the piston and extending to the outside, and a disc valve mounted on each side of the piston for generating damping force. The disc valve exposed to the first liquid chamber comprises at least three mutually overlapping annular discs. The outer circumference of a first disc which is located contiguous to the piston is easily deflectable, and a second disc which is located contiguous to the first disc has at least one opening, one end of which is communicated permanently with the first liquid chamber.

Abstract: A hydraulic recoil brake system for braking the recoil of a gun barrel during and after the firing traverse period. The system includes a hydraulic cylinder in which a hollow piston and piston rod are reciprocally mounted in the cylinder. The piston rod is connected to the gun barrel. A regulating throttling mandrel is fixedly mounted in the cylinder and axially extends into the hollow piston and hollow cylinder. The piston and cylinder are constructed and shaped in such a way that at least two flow passages F.sub.1 and F.sub.2 are defined. While the first flow passage F.sub.1 is present during the entire recoil movement the second flow passage F.sub.2 is present only during the firing traverse period. The second flow passage F.sub.2 extends from a first inner partial chamber disposed in front of the recoiling piston to a second partial inner chamber disposed behind the recoiling piston.

Abstract: 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 inner periphery of the cylinder tube.

Abstract: A vortex flow shock absorber includes a piston having a vortex chamber therein. The piston communicates with one fluid chamber defined in a absorber cylinder via a vortex chamber and with the other fluid chamber separated from the former by the piston via a flow restricting opening. One-way valve is provided in a piston rod which defines a fluid passage permitting one way flow of the fluid from the vortex chamber to one of the fluid chamber. The one-way valve is responsive to an excessive fluid pressure in the vortex chamber to relieve the fluid pressure exceeding a predetermined value. The piston and piston rod are attached together with pressure welding. This simplifies the assembling operation of the piston onto the piston rod.

Abstract: 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 may be constituted by a sequence of passage sections arranged at right angles to one another and, in one embodiment, are formed in the end faces of the piston member so as to lie in planes transverse to the axis of the cylinder. If desired, additional fluid passage units may be connected in series to provide an enhanced damping effect.

Abstract: 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 may be constituted by a sequence of passage sections arranged at right angles to one another and, in one embodiment, are formed in the end faces of the piston member so as to lie in planes transverse to the axis of the cylinder. If desired, additional fluid passage units may be connected in series to provide an enhanced damping effect.

Abstract: 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 in the piston. The vortex passage extends in the ceiling or bottom of the piston and tangentially opens at the upper and lower plane periphery of the vortex chamber. By providing the vortex passages in the above-mentioned manner, the radius of the vortex chamber can be maximized in relation to the radius of the piston thus reducing the size of the piston and, in turn the shock absorber.

Abstract: A piston for a pneumatic, hydraulic or hydropneumatic fluid-filled cylinder includes a constantly open throttled passage therethrough comprised by at least one spiral-shaped throttled channel extending in a plane perpendicular to the piston axis. The spiral configuration of the throttled channel permits the use of a relatively large flow cross section in the channel, thereby preventing clogging of the throttling passage by contaminants entrained in the damping medium, while still providing the desired damping effect.

Abstract: Disclosed is a liquid metering valve unit, particularly for water. The unit uses a dash-pot mechanism filled with metering liquid such as water, silicone oil or a mixture of water and glycerine. The dash-pot mechanism is a closed system. The unit comprises a sleeve member having an axial bore and a transverse bore communicating with the axial bore. One end of the axial bore connects to a liquid supply and the transverse bore connects to an outlet. A valve stem in the axial bore is slidable between an open position and a closed position in which a resilient seat washer seals the end of the axial bore. A spring biasses the stem toward the closed position and the stem can be manually moved to the open position. Movement of the stem to the closed position is controlled by a dash-pot mechanism or regulating means comprising a cup washer secured to the stem and disposed within a liquid-filled chamber betwen the stem and sleeve.

Abstract: A shock absorber with improved shock absorbing characteristiscs has a piston in which a vortex chamber is formed. The vortex chamber communicates with upper and lower fluid chambers via communication passages. One of the communication passage opens to the vortex chamber tangentially to produce a vortex in the vortex chamber. Within the vortex chamber, a member is normally elastically urged to narrow the area through which the fluid flows. The member is responsive to the fluid pressure exceeding a predetermined value to move against the resilient force in the direction increasing the area allowing fluid flow. A bottom fitting of similar construction and function is also disclosed.

Abstract: A device for producing the damping force in a hydraulic shock absorber comprising a non-return valve element adapted to open in the compression stroke so as to permit the free flow of working oil, a leaf valve element adapted to deflect downwards under the pressure of the working oil flowing through the holes formed in the non-return valve element during the expansion stroke, thereby providing the damping force, and a support shim interposed between the non-return valve element and the leaf valve element. The leaf valve element and the support shim are interposed between a piston and a valve stop.

Abstract: A method of damping relative movement between components of a railway car and more particularly a method of damping such movement which is operable only when the railway car is normally operating in a loaded condition.

Abstract: A hydraulic shock absorber has a piston slidable in a pressure tube, and separating the tube into two chambers. The piston has a flow passage therein with an annular groove in the piston about an extremity of the passage. Transverse passages communicate the flow passage with the groove and the groove with one of the chambers. A spring urged valve extends over the groove and transverse passages, constricting fluid flow thereto until excess pressure displaces the valve and permits flow directly from the flow passage to the one chamber.