Abstract: The support has a generally annular shape and a fixing device extends axially therethrough. It comprises an annular elastically yieldable mass connected to two frames, a semi-toric membrane fixed between the two frames and defnining with the outer surface of the mass a work chamber (A). This chamber communicates with an expansion chamber (B) through a passageway. The support also includes a device for limiting its axial and radial movements. Such a support has a particularly low natural stiffness both in the radial direction and in the transverse direction, which improves the filtering of high frequency vibrations while affording a good damping of trepidations of low frequency and large amplitude.

Abstract: A vehicle engine suspension system in which, in order to reduce `shake` electrically actuated engine mounts are provided, power being supplied to the engine mounts by a control system responsive to vehicle body accelerations (e.g. in the vertical direction). The arrangement is such that when a tendency of the body to move is detected, e.g. by an accelerometer mounted on the body, the engine mounts are actuated so as to generate, between the engine and the body, forces which are of such amplitude and phase as to reduce the shake of the body.

Abstract: In a hydraulic antivibratory support for insertion between two rigid elements (1 and 3), and comprising a work chamber (A) and a compensation chamber (B) separated by a dividing wall (6) and joined together by a restricted passage, this restricted passage, defined at both ends by two fixed orifices (31, 32) opening respectively into the two chambers (A and B) is defined over at least a portion of its lateral periphery by a flat or cylindrical face (25) of a rigid rotary valve (26) housed jointingly between the two orifices and connected angularly to the rotor of a small electric motor (19).

Abstract: A fluid-filled cylindrical elastic mount having an inner and an outer sleeve which are disposed in mutually spaced-apart relation with each other, and an elastic body interposed between the inner and outer sleeves so as to elastically connect the inner and outer sleeves. The elastic body at least partially defines a fluid-filled chamber located between the inner and outer sleeves in a load-receiving direction in which a vibrational load is applied to the elastic mount. The elastic body includes a thin-walled portion which partially defines the fluid-filled chamber and which elastically yields to permit the chamber to be elastically deformed upon application of the vibrational load. A movable member is accommodated in the fluid-filled chamber such that the movable member is freely movable over a predetermined distance in the load-receiving direction.

Abstract: A vibration isolator particularly suited to isolating a closed cycle refrigerator in a cryopump includes two bellows covered with vibration damping material and separated by an intermediate mass. The damping material fills the spaces between corrugations of the bellows and is bonded to the bellows. A dynamic absorber operates to attenuate vibrations of a partucular frequency from being transmitted into the refrigerator from a drive unit of the cryopump.

Abstract: A two mass vibration isolator particularly suited to a linear reciprocating machine. Vibration into and out of the machine is attenuated by an isolator placed between the machine and its mounting frame. The isolator is an elastomer with a damping ratio of at least 0.1 sandwiched between two retainers.

Abstract: The bearing includes of a beaker-type housing part in which a soft rubber support spring is arranged bearing a load supporting plate which is enclosed by a disc-type control spring arranged transversely to the support spring. The combination of the control spring and the load support plate is clamped radially pre-stressed in the upper portion of the beaker-type housing part such that the beaker-type housing part is hermetically closed in a gas-tight and liquid-tight manner. A clapper-type damping piston is suspended in a recess at the lower side of the load support plate and is free to move in an axial direction; The piston head is slidably fitted in a substantially exactly fitting manner into a cylindrical tube attached to the bottom of the beaker-type housing part. The hermetically closed bearing is filled with a damping liquid.

Abstract: A bushing type vibration insulator, for example, used as a suspension bushing of an automotive vehicle. The vibration insulator consists of an outer cylindrical member connected to one member of the suspension. The outer cylindrical member is connected through an elastomeric member with an inner cylindrical member which is connected to another member of the suspension. The inner and outer cylindrical members share a common central longitudinal axis. Two fluid chambers are formed between the outer cylindrical member and the elastomeric member and filled with a fluid. The fluid chambers are communicable through a communication passage formed through an actuator fixedly secured directly to the outer cylindrical member. The actuator is constructed and arranged to block fluid flow through the communication passage under a predetermined condition, thereby raising the spring constant of the vibration insulator.

Abstract: A combination viscous and resilient type of mount comprises a rigid boss adapted to be connected to a moving component such as an reciprocating engine, an annular flange adapted to be connected to a stationary support, a resilient element connected between the boss and the annular flange to resiliently supporting the moving component relative to the stationary support, the resilient element having a frustconical shape, a deformable element cooperating with the resilient element to define a chamber for viscous fluid, and a rigid partition connected to the flange and adapted to divide the fluid chamber into a working chamber and a compensation chamber, the partition including at least one orifice through which the two chambers are communicated with each other. A rigid spacer is interposed between the boss and a flange of the moving component and has an annular projection. A rigid ring is inserted into the resilient element and has an outwardly extending annular flange.

Abstract: Fixing means (4, 5) extend axially throughout this support which has a generally annular shape. It comprises an annular elastically yieldable body (1) connected to two frames (2, 3), a flexible elastically yieldable wall (8) fixed between the two frames (2, 3) and defining with the outer surface of the body (1) a working chamber (A). This chamber communicates with an expansion chamber (B) through a duct (16). The support also includes means for limiting its axial and radial movements. Such a support has a particularly low specific stiffness both in the axial and transverse direction, which improves the filtering of high frequency vibrations, while affording a good damping of low frequency and large amplitude trepidations. It is moreover easy to manufacture and therefore of relatively low cost.

Abstract: A fluid filled elastic bushing, including a tubular inner sleeve to which a shaft member is fixed, and a tubular outer sleeve which is secured to a support structure and which is disposed radially outwardly of the inner sleeve so as to form an annular space between the outer and inner circumferential surfaces of the inner and outer sleeves, and to form a cylindrical space between opposed bottom walls at the closed ends of the two sleeves. The bushing further includes a cylindrical elastic connecting member which fluid tightly fills a portion of the annular space adjacent to the open ends of the two sleeves, and thereby cooperates with the sleeves to define a fluid chamber which includes a remaining portion of the annular space and the cylindrical space and which is filled with the fluid.

Abstract: In cryogenic refrigerator provided with a cryostat having a low temperature level maintaining part for cooling and maintaining a part to be cooled at a very low temperature level and an expander which is fitted in the low temperature level maintaining part of the cryostat and generates cold in the low temperature level maintaining part by expanding refrigerant gas compressed by a compressor, vibration of the working expander is prevented from being transmitted to the part to be cooled by fixing and supporting the part to be cooled to the cryostat, separately from the expander, thereby minimizing the bad influence or vibration on a cryogenic working apparatus which is sensitive to vibration and by integrally supporting the part to be cooled and the expander to the crystat. In this way, the necessity of supporting the part to be cooled and the expander individually is eliminated and installation of the refrigerator is easy.

Abstract: A dual mode vibration isolator for reducing transmission of vibrations between a forward body and an aft body includes a mounting member positioned between the forward and aft bodies, a plurality of magnetic actuators each having an armature fixed to the forward body and a stator mounted on the mounting member, and a plurality of linear actuators pivotally connected between the aft body and the mounting member. The magnetic actuators support the forward body relative to the mounting member by magnetically supporting the armatures between paired stator cores in each stator. The magnetic actuators are controlled, preferably through local flux feedback loops, to permit the stators to vibrate relative to the armature without transmitting forces to the armatures, thus isolating the vibration of the aft body and mounting member from the forward body. The linear actuators extend and contract to reposition the forward body and mounting member relative to the aft body.

Abstract: A fluid-filled elastic cushioning device for elastically connecting a first and a second member, including an inner sleeve attached to the first member, an elastic body fitted on the inner sleeve and having two pockets which are open in opposite axial end faces of the elastic body, two closure members for closing the open ends of the pockets to thereby form two fluid chambers, an orifice member embedded in the elastic body and having an orifice communicating with the fluid chambers, and a mounting plate secured to the orifice member. At least one of opposite ends of the orifice is open at a bottom of the corresponding at least one of the pockets, and at least one stopper rubber block is secured to each of at least one of the closure members which closes the corresponding at least one of the pockets. Each rubber block extends into the corresponding one of the fluid chambers such that a free end of each rubber block is normally spaced apart from the corresponding open end of the orifice.

Abstract: A composite engine mount includes first and second members and an elastic member. The second member defines a space into which one portion of the first member extends. A first stopper rubber for providing a front and rear, left and right and rebound stopper is fixed to the one portion of the first member. Due to the structure, an assembly of the mount and brackets to be fixed to the first and second members can be made small. Such a mount is suitable for use in a left-hand and a right-hand engine mount for a transversely mounted engine.

Abstract: A system includes a single snubber and a rigid strut, to support two spaced locations on equipment to a structural support, in a manner that allows each location of the equipment to slowly move independently of the other, as to accommodate changing equipment temperature, while resisting rapid movement of either, as can occur in an earthquake. A linking element is pivotally mounted on the support, and one end of the snubber and one end of the strut are pivotally mounted at spaced locations on the linking element. The opposite ends of the snubber and strut are pivotally mounted at spaced locations on the equipment.

Abstract: A vibration absorbing apparatus disposed between a vibration source and a vibration receiving portion and having a tubular member which is formed such as to pass through an expandable liquid chamber and which is attached to one of the vibration source and the vibration receiving portion. A partitioning plate is secured to the outer periphery of the tubular member such as to divide the liquid chamber into a plurality of liquid sub-chambers. The liquid sub-chambers communicate with each other via an orifice. Accordingly, even if the direction in which vibration acts upon the apparatus is shifted, it is possible to prevent the occurrence of "pinch" between the partitioning plate and the tubular member.

Abstract: These telescopic energy absorber units have outer tubes threaded into connection with vehicle hard bar bumper or fascia support to permit fore and aft adjustment by rotation of the piston tube of the unit in clockwise or counterclockwise direction.

Abstract: A fluid-filled elastic mount including a first support member and second support member, an elastic body interposed between the first and second support members, a closure member for partially defining a fluid chamber filled with a non-compressible fluid, a partition device for dividing the fluid chamber into a pressure-receiving chamber and an equilibrium chamber, a device for defining a restricted passage for restricted fluid communication between the pressure-receiving and equilibrium chambers, and a movable member which is supported deformably or displaceably in a load-receiving direction. The elastic mount further includes an operating device having a cup-shaped member for dividing the pressure-receiving chamber into a first section on the side of the first support member and a second section on the side of the partition device. The cup-shaped member cooperates with the elastic body to define an annular restricted portion which communicates with the first and second sections.

Abstract: An improved measuring device for measuring the unit weight of sliver as it passes through a trumpet includes a trumpet gauge plate for supporting the trumpet and a pair of weighted elements mounted on each side of the plate. The plate includes upper, lower and central portions wherein the lower portion includes an opening for supporting the trumpet and the central portion has a reduced cross section. A plurality of strain gauges for detecting deflections is mounted on front and rear surfaces of the central portions adjacent the lower portion and the weighted elements. The strain gauges are electrically connected in a modified Wheatstone Bridge configuration. Deflection sensings in strain gauges adjacent the weighted elements cancel out deflection sensings produced by external vibrations to produce an accurate measurement of the sliver weight.

Abstract: An indirect firing fastener driving tool is provided including a barrel (51), a piston (6) sliding in the barrel for driving a fastener (3) housed in a fastener guide (7). Between the barrel (51) and the fastener guide (7) are disposed a rigid ring (22) and a resilient ring (24). Inside the resilient ring (24) is disposed a rigid ring (27) for limiting the stroke of the ring (22) intended to be received in a recess (25) provided at the rear part of the fastener guide (7). The head (14) of the piston is of a truncated cone shape and may cooperate with a bore (23) of corresponding shape in the rigid ring (22). The rings serve as absorber for the piston (6) whose stroke is thus controlled.

Abstract: An engine mount with hydraulic damping includes a wall of elastomeric material and a bearing plate for supporting an engine together defining a working chamber. The bearing plate is disposed at an end of the working chamber defining an inner surface of the bearing plate facing the working chamber. The inner surface has a recess formed therein in the form of an air storage chamber. A throttle element closes off the air storage chamber from the working chamber. The throttle element has a central throttle opening formed therein.

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 first chamber (18) of variable volume is interposed between the body (20) and the adjacent part of the damper (14) and hydraulically connected to a second chamber (40) of variable volume provided in an elastically yieldable support (24) interposed between the power unit (22) and the body (20) so as to constitute a work chamber. The second chamber (40) is connected to a third chamber (41) of variable volume constituting a simple expansion chamber which is not subjected to exterior forces, through a passageway of great length and small section. The hydraulic connection between the first chamber (18) and at least one of the other two chambers (40), (41) is achieved, at least partly, through the passageway of great length.

Abstract: In a hydraulic antivibratory support intended to be interposed between two rigid elements (1 and 3) and including a work chamber (A) and a compensation chamber (B) separated by a dividing wall (10) and connected permanently together through a restricted passage (11), the whole of these chambers and this passage being filled with liquid, the work chamber is defined outwardly by an annular support wall (7) having the general shape of two hollow and thick truncated cones of opposite directions (7.sub.1, and 7.sub.2) juxtaposed axially by their large bases, their two small bases being connected respectively to the two rigid elements.

Abstract: An air spring seat principally for buses, trucks, boats or other vehicles includes a manual air pump for inflating and deflating the air spring. The manual air pump includes a piston having a rearward air intake stroke, a forward compression stroke to deliver pressurized air through a check valve delivery and venting system to the air spring, a pressure stablized at rest position at the end of the compression stroke and a forward venting stroke from the at rest position mechanically to release air from the air spring through the check valve delivery and venting system. A floating seal carried by the piston provides a fluid tight seal between the piston and pump body during the piston compression stroke but permits air to move from the intake side of the piston to the compression side of the piston during the piston intake stroke. The piston movements are all controlled by a manual lever handle readily accessible to the seat occupant.

Abstract: A soft mounting for insulating body transmitted waves comprises a soft support spring block made of elastic material. The support spring block is disposed between two beaker-type housing parts which serve to transfer load forces into the support spring block. The housing parts are arranged coaxially with respect to one another and are telescopically positioned within one another. Elastomer spring elements having cavities located therein concentrically surround the support spring block. The cavities serve to show the effect of a collapse of a spring restoration force by kinking.

Abstract: A dual-chamber support bed with hydraulic cushioning especially for engine mount in motor vehicles includes a working chamber and a compensating chamber filled with liquid have walls (3, 4) comprising annular rubber diaphragms with a predetermined buckling characteristic to adapt to the operating load the chambers are connected to one another through a nozzle channel. The nozzle channel is defined between profiled parts overlapping one another which are two rigid components of a housing that are adjustable to one another. The channel flow resistance is adjustable by means of a screw-driven regulating unit. The two components forming the nozzle channel there between are adjustable axially relative to one another in the direction of the vertical axis of the mount. One of these components is thread onto a spindle that can rotate freely in the housing. An operating member for rotating the spindle extends out of the housing, and can be screwed on it coaxially with the vertical axis.

Abstract: An apparatus for supporting an object on a base for isolating the object from movement of the base, typically an art object, instrument, case, or housing for projection during seismic activity. The apparatus includes a base plate for attachment to the base, with a frame positioned on the base plate and adapted for omni-directional movement over the base plate. A lever is pivotally mounted on the frame and is connected to a spring, typically by a cable. The lever is also connected to the base plate, typically by another cable, with movement of the base plate moving the lever and extending the spring, after which the spring retracts, restoring the apparatus to the rest position.

Abstract: A hydraulic mount assembly includes a pair of mounting members connected to each other through a hollow elastomeric body. The body is closed by a resilient diaphragm so as to form a cavity for damping liquid. A partition or plate is provided to divide the fluid filled cavity into two distinct chambers. A primary chamber is formed between the partition and the interior wall of the body. A secondary chamber is formed between the partition and the interior wall of the diaphragm. The partition includes at least two flow passages connecting the two chambers. A sliding gate extends across the opening to one of the passages. This gate is displaceable to direct an infinitely variable flow of liquid between the primary and secondary chambers to provide an infinitely variable damping effect. The gate is actuated by a linear solenoid providing this desired proportional operation. The other passage opening remains fully open at all times. In another embodiment, a rotary valve extends across the passage entry.

Abstract: A vibration isolating apparatus is provided with a liquid chamber which is capable of being expanded and contracted for the purpose of absorbing vibrations. The liquid chamber is partitioned into small liquid chambers by a resilient membrane, the chambers being communicated with each other through an orifice. Vibrations are transmitted to the small liquid chambers through a transmission shaft which extends through the resilient membrane and which is slidable relative to the membrane. Accordingly, even when the direction in which vibrations act changes, vibrations applied to one small liquid chamber are reliably transmitted to the other small liquid chamber. Thus, contraction of one small liquid chamber causes the other small liquid chamber to expand, and a liquid is forced to pass through the orifice while generating fluid resistance whereby the vibrations are absorbed.

Abstract: A mounting structure disposed between a body and a power unit of a vehicle for mounting of the power unit on the body, so as to effect vibration damping and isolation under the control of a control device, including: an elastic body connected to one of the body and the power unit of the vehicle, and partially defining a pressure-receiving chamber filled with an incompressible fluid; an elastic member partially defining an equilibrium chamber filled with the fluid and communicating with the pressure-receiving chamber, so as to permit a change in a volume of the pressure-receiving chamber; a movable member disposed between the pressure-receiving and equilibrium chambers, and exposed to the pressure-receiving and equilibrium chambers, the movable member being movable over a predetermined maximum distance in opposite directions parallel to a direction in which the mounting structure receives vibrations; an elastic holder for flexibly supporting the movable member such that the movable member is movable in the opp

Abstract: A vibration isolating apparatus has a pair of small liquid chambers which are communicated with each other through an orifice. A partition which divides the small liquid chambers is provided with a vibrating plate in order to suppress rise in liquid pressure within the small liquid chambers. When a vibration of extremely low frequency is input, a part of a flexible membrane which defines a part of the liquid chamber is pressed against the vibrating plate by the action of a restraining means to prevent vibration of the vibrating plate. Accordingly, the occurrence of resonance of the liquid within the orifice is ensured, and the vibration is thereby effectively absorbed.

Abstract: A vibration insulating device to be installed between two members of a vibration system of an automotive vehicle. The device consists of an annular elastic member disposed between coaxial inner and outer cylindrical members and located coaxial with the outer cylindrical member. The elastic member is formed at its outer peripheral surface with a deep annular groove coaxial with the outer cylindrical member which groove is covered with the outer cylindrical member to define an annular hollow chamber. A generally cylindrical flexible diaphragm member is secured between the outer cylindrical member and the elastic member in such a manner that its central annular section divides the hollow chamber into a radially outward gas chamber and a radially inward liquid chamber, thereby effectively absorbing even high frequency small amplitude vibration transmitted to the device under deformation of the flexible diaphragm member.

Abstract: A hydraulic mount assembly is disclosed having a partition including a damping decoupler between two hydraulic chambers. One chamber is formed by an elastomeric member and the other by a resilient diaphragm. During dynamic loading of the mount, fluid passes between the two chambers of the mount by moving around an orifice track and/or by bypass around the decoupler causing expansion and contraction of the diaphragm. A magnetic coil is provided adjacent the diaphragm in alignment with the decoupler to supply a controlling magnetic field. The decoupler is made of a magnetic material and is positionally responsive to the variations in the intensity and direction of the controlling magnetic field. By actively controlling the decoupler position in this manner, the dynamic characteristics of the mount are varied. A control circuit with on-board transducers is provided to monitor vehicle operating and road response conditions and modulate the voltage to the magnetic coil for maximum damping effect.

Abstract: A vibration isolating apparatus having a support shaft connected to either one of a vibration generating portion and a vibration receiving portion, a base member connected to the other of the two, and a resilient member interposed between the base member and the support shaft and deformable in response to the movement of the support shaft in a direction substantially perpendicular to the axis thereof. A stopper is provided on the side of the support shaft which is remote from a vibration absorbing liquid chamber for limiting the movement of the support shaft. Accordingly, even when a load acts on the support shaft and the base member in a direction in which they are pulled away from each other, the support shaft can reliably be supported by way of the stopper.

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 fluid-filled resilient bushing including a generally annular resilient member interposed between inner and outer sleeves and having a generally annular recess open in the outer circumferential surface of an axially intermediate portion thereof. The outer sleeve fluid-tightly closes the annular recess, and thereby cooperates with the resilient member to define a generally annular fluid chamber filled with a viscous fluid. The bushing has portions for defining a pair of shearing gaps as two opposite portions of the annular fluid chamber which are opposite to each other diametrically of the inner sleeve, in a first diametric direction perpendicular to a second direction in which the bushing receives a vibrational load.

Abstract: An assembly is disclosed for mounting a vibrating body to a support structure, being particularly adapted for use as an engine mount system for a motor vehicle. The assembly comprises a mount having a chamber which, in use, is fluid-filled, and further comprises a vacuum accumulator in fluid communication with the mount chamber. More specifically, the mount comprises (a) a housing comprising a substantially rigid wall with a first opening therethrough and a first elasticly deformable body sealingly bonded to the wall to form a fluid-tight closure of such first opening, the housing defining an elasticly expandable fluid-tight chamber with a first port, such chamber being in fluid communication with the vacuum accumulator through such first port via a fluid conduit; (b) a rigid attachment of the housing wall to either the vibrating body or the support structure; and (c) an attachment of the mount to the other of the vibrating body and support structure, which attachment is to the elastomeric body.

Abstract: The oil supply system for a fluid squeeze film damper carries a high frequency check valve mounted in serial flow relation to a low frequency check valve, wherein the low frequency check valve is disposed between the source of oil and the high frequency check valve so as to maintain the stiffness of the oil film and high level of the average oil pressure.

Abstract: This invention relates to a vibration-preventing device wherein a partition wall is positioned outside of an inner cylinder and is interposed between an upper plate and a lower plate. The partition wall includes a hub portion. The upper plate and lower plate are connected to the inner cylinder. An upper vibration-preventing rubber member and an upper elastic film are interposed between the partition wall and the upper plate and cooperate to define an enclosure which functions as an upper damper liquid chamber. A lower vibration-preventing rubber member and a lower elastic film are interposed between the partition wall and the lower plate and cooperate to form an enclosure which functions as a lower damper liquid chamber. The upper damper liquid chamber communicates with the lower damper liquid chamber through an orifice.

Abstract: Hydraulically damping elastic bearing with two rigid end walls opposite one another in the axial direction, and at least two chambers located one behind the other and containing damping fluid, at least one of which has a circumferential wall designed as an elastic spring element, whereby the chambers are separated from one another by a partition which is at least partly elastic exhibiting slits for an exchange of fluids. The elastic partition should thereby be designed so that when there is flow against the membrane from different chambers at the same pressure, a different pressure reduction is possible. For this purpose, the elastic partition is asymmetrical in cross section in relation to its center line, at least in the area of the slits, so that the opposite surfaces of the elastic partition are at different distances from the center plane in the area of a slit.

Abstract: A hydraulic-damping engine mount includes a working chamber having a given diameter and a compensating chamber. A rigid intermediate plate is disposed between the chambers. A conical jacket-like rubber-elastic wall has relatively smaller and larger diameter ends. A metal bearing plate is disposed at the smaller diameter end and at least partly defines the working chamber along with the intermediate plate and the wall. The intermediate plate has an overflow opening formed therein interconnecting the chambers. A rigid plate in the form of a circular disk has a diameter smaller than the given diameter. The rigid plate is disposed in the working chamber parallel to the intermediate plate and is rigidly connected to the bearing plate.

Abstract: The method comprises determining a first resonant frequency of a system comprising a vibratory body, a supporting body and a vibration damping device disposed therebetween. Vibrations at the first resonant frequency are dampened by defining first and second chambers in the device which are separate from each other and communicate with each other through a passage configured to impart a second resonant frequency to fluid received within the passage which substantially equals the first resonant frequency.

Abstract: A hydraulic mount assembly is disclosed having a partition including a damping decoupler between two hydraulic chambers. One chamber is formed by an elastomeric member and the other by a resilient diaphragm. During dynamic loading of the mount, fluid passes between the two chambers of the mount by moving around an orifice track and/or by bypass around the decoupler causing expansion and contraction of the diaphragm. A magnetic coil is provided adjacent the diaphragm in alignment with the decoupler to supply a controlling magnetic field. The decoupler is made of a magnetic material and is positionally responsive to the variations in the intensity and direction of the controlling magnetic field. By actively controlling the decoupler position in this manner, the dynamic characteristics of the mount are varied. A control circuit with on-board transducers is provided to monitor vehicle operating and road response conditions and modulate the voltage to the magnetic coil for maximum damping effect.

Abstract: A cryostat asssembly comprises at least one substantially heat insulating wall surrounding a cooled region for restricting heat flow into the cooled region. A refrigeration system is provided having a heat absorbing portion coupled with the wall to enable heat to transfer to the heat absorbing portion, the refrigeration system also having a heat evacuating portion to enable absorbed heat to be evacuated from the cryostat assembly.

Abstract: A spring element with hydraulic damping includes a rubber-elastic peripheral wall and two rigid end walls defining a chamber therebetween, an electroviscous fluid filling the chamber, a stack of at least two metal plates disposed in the chamber, and elastic rubber elements disposed between and maintaining mutual spacings between the metal plates, the metal plates being alternately connected to a voltage source and to ground potential.

Abstract: The invention provides a hydraulic antivibratory support interposed between a vehicle chassis and engine, including a work chamber (A) and a compensation chamber (B) filled with liquid and joined together through a nozzle (19) whose section, which determines the frequency of the best damped oscillations, can be modified even during operation of the support. This nozzle is defined at least partially by a deformable wall (20) and modifications of the section of the nozzle are obtained by deforming the wall.

Abstract: The support is particularly compact, simple in construction and very reliable in operation. It comprises a main composite unit (1) comprising a first fixing element (3) and a mass of elastic material (2), this mass forming, on one hand, a massive portion (6) of a roughly frusto-conical general shape disposed between the first fixing element (3), part of this main unit between the two armatures (4, 5) being gripped between a housing (8) and a cover (9) fixed to each other and constituting a second fixing element. The housing defines with the elastic mass a work chamber (11), an expansion chamber (12) and a communication passageway (13) interconnecting with the chambers.

Abstract: A vibration absorber is provided having a pendulum (12) mounted on a body (21) for oscillation about an axis (13). A pair of resilient members (14, 15) are mounted on the body (21) in contact with the pendulum (12) in preloaded opposed relation with respect to oscillation of the pendulum (12) about the axis (13) and resonant at the frequency of the vibration. A pair of resilient members (16, 17) are mounted on the body (21) to contact the pendulum (12) only upon oscillation of magnitude beyond a predetermined limit.