Abstract: In a duo-pumping hydraulic mount, two acting pistons are employed, one associated with each working chamber. The pistons are rigidly connected. During operation, internal pressures generated in each chamber are opposite in sign with one being negative and the other being positive. Therefore, to achieve a given pressure differential across the fluid track, the magnitude of the pressure in each working chamber is half what would be experienced in a conventional single pumping mount. Durability is improved by reducing internal pressures and by distributing kinetic loads to two rubber elements so that individual stresses are minimized. An individual load bearing element supports static loads on the mount.

Abstract: An engine mount for a saddle-seat vehicle includes an upper engine mount operatively connected to the engine of the vehicle. The upper engine mount operatively connects the engine to the frame of the vehicle. At least one connector is provided for connecting the engine to the upper engine mount. The upper engine mount permits substantially free vertical movement of the engine relative to the frame. The upper engine mount includes an outer sleeve operatively connected to the frame. The upper engine mount further includes an elastic cushion arranged between the connector and the outer sleeve. The upper engine mount may further include an inner sleeve located within the elastic cushion for passage of the connector therethrough. The upper engine mount further includes a plate bracket operatively connected between the outer sleeve and the frame. The plate bracket may include lightening holes therein for decreasing the weight of the plate bracket while increasing flexibility of the plate bracket.

Abstract: A drive motor mounting module for a hybrid electric vehicle and the motor mounting module in combination with the hybrid electric vehicle. More specifically, the drive motor mounting module is comprised of a drive motor, a front motor mount support bracket, a chassis front support bracket, a chassis cross member, two rear motor mount brackets, two cross braces, two vertical channels and two motor module locating mounts. The entire module can be modularly assembled prior to installation to the vehicle chassis on a main assembly line. The mounting module engages the drive motor to the chassis by three point mountings.

Abstract: A bearing arrangement for an internal-combustion engine forms a unit with a transmission and is mounted transversely in a body of a vehicle is held on the vehicle body by way of at least one bearing and at least one torque support.

Abstract: A motor vehicle has its power unit connected to its vehicle structure via a suspension provided with at least one mount which comprises a rigid support arm secured to the power unit, an antivibration support including an elastomer body which supports the power unit while allowing displacements of the power unit at least parallel to a vertical first axis and parallel to a horizontal second axis, and a displacement limiter acting parallel to the second axis. The displacement limiter comprises three rigid fingers perpendicular to the second axis, together with two limiter rings of elastomer reinforced with strong thread, each ring surrounding two of the three fingers, specifically a finger secured to the support arm and a finger secured to the vehicle structure.

Abstract: Vulcanized rubber parts suitable to dampen vibrations generated by mechanical devices are disclosed. The parts are based on a cured composition comprising one or a mixture of a diolefin polymers, e.g., natural rubber, a halogenated copolymer of a C.sub.4 to C.sub.7 isomonoolefin, e.g., isobutylene, and a para-alkylstyrene, filler and a curing system. The vulcanized parts exhibit improved aging and high temperature resistance and reduced deterioration of dynamic properties after long term exposure to high temperatures.

Abstract: A vehicle mounting system is disclosed having a transfer arm coupled between the engine and the vehicle's rear axle for equalizing rear tire traction, control violent vibrations due to tire shake, improve drivability of the vehicle and safe control thereof The arm works by torque rotation of the engine at acceleration creating an upward force of the transfer arm at the area engine mount.

Abstract: An engine mount with hydraulic damping for motor vehicles which has at least two chambers, which are provided with at least partially elastically deformable walls in a housing and are filled with a damping fluid. A common valve plate is between the chambers. An uncoupling membrane of an elastic material is arranged in a cage structure with openings. The edge of the uncoupling membrane is inserted radially movably with a gentle pretension or clamping force in a recess between two disks of the valve plate, which are designed as a cage, wherein at least one of these openings is continued radially to the edge of the uncoupling membrane.

Abstract: An active engine mount system for supporting an engine on a vehicle body is used for controlling the vertical movement of the vehicle body produced by irregularities of the road surface. The engine mount system comprises an actuator interposed between the engine and the vehicle body for applying a vertical force to the vehicle body so that the vertical acceleration of the vehicle body for each given condition of the road surface may be minimized by adjusting a contribution of the mass of the engine to the mass of the vehicle body. The engine mount system may consist of a full active or semi active mount system. By detecting the road condition ahead of the vehicle, a particularly favorable result can be achieved.

Abstract: A power plant support device for a vehicle which includes a releasable first mount and second mount. The first mount has a releasing mechanism which releases a connection to the power plant upon an impact force larger than a predetermined impact force. The second mount rotatably supports the power plant and is located below the center of gravity of the power plant, but it has enough endurance to support against the predetermined impact force. When a front collision of the vehicle occurs and the power plant receives an impact force larger than the predetermined impact force, the connection between the first mount and the power plant is released and the power plant rotates about the second mount, so that the power plant moves away from a lower dash panel of the passenger compartment. Thus, the degree of crush of a framework of the vehicle increases and a larger shock can be absorbed.

Abstract: A frame beaming reduction assembly for use with a motor vehicle to eliminate or reduce the amplitude of frame beaming oscillations in a vehicle's frame caused by vibratory forces exerted on a motor vehicle. The assembly includes a frame having a beaming frequency in a first range of frequencies, and an engine is attached to the frame wherein the engine generates engine vibration that has a second range of frequencies that is different than the first range of frequencies. A spring is positioned between a cross member of the frame and a forward engine mount of the engine. A damper formed by a pair of shock absorbers is positioned between the frame and a second forward engine mount substantially parallel to the spring such that the combination of the damper, the spring, and the engine has an offsetting frequency that is substantially equal to the frame's beaming frequency and that offsets the beaming frequency.

Abstract: A dilatant fluid-sealed vibration-insulating device includes a connection member to be connected to one member, a holder to be connected to another member, an insulator provided between the connection member and the holder, the insulator being made of a rubber-like elastic material, a main chamber and an auxiliary chamber serially provided below the insulator. A partition plate separates the main chamber and the auxiliary chamber from each other. An orifice is formed in the partition plate to communicate the main chamber and the auxiliary chamber with each other. An air chamber is provided into which the air is introduced. A diaphragm separates the air chamber from the auxiliary chamber, and a dilatant fluid is sealed in the main chamber and the auxiliary chamber. When vibrations having very low frequency of about 5Hz and a relatively large amplitude are inputted to the vibration-insulating device, the dilatant fluid exhibits a relatively small viscosity increase insufficient to dampen the vibrations.

Abstract: This device comprises levers and cables (21, 29, 23) for actuating a clutch which is located between an engine and the gearbox, spring (37) for determining the angle through which the engine is rocked with respect to a nominal operating position, and cable (39) for opposing clutch engagement when the angle of rocking is greater than a predetermined angle.

Abstract: A motorcycle utilizes a support frame upon which an engine and transmission are supported in an in-line front to back relationship. The engine and transmission cases are coupled by a primary engine case on one side. A torque resisting arm configured to be fitted to the opposite sides of the engine and transmission cases from that which the primary engine case occupies is secured to underlying faces of the engine case and transmission case to provide a torque resisting member therebetween. The torque resisting arm includes a generally planar engine attachment plate configured to be received upon the engine case and a generally planar spanning plate configured to be received upon the transmission case. The torque resisting arm further defines an offset wall and curved wall extending between the engine attachment plate and the spanning plate.

Abstract: An arrangement for damping vibrations transmitted from an engine of a small watercraft to its hull even while the ship is travelling at high speed. Its main engine is mounted on the bed of the ship by fixing its legs to the bed through a fixing element including rubber mounting members. This arrangement further includes an engine movement restricting member for preventing the engine from moving relative to the hull.

Abstract: An convertible automotive vehicle having a unibody chassis with a single mass damper for reducing perceptible passenger compartment vibrations is disclosed. The single mass damper is uniquely tuned to the overall vehicle frequency response and suspended between a rail adjacent to a front suspension assembly and a bumper mounted to the rail with an energy absorbing device.

Abstract: A vibration damping support apparatus for a power unit of an automobile is disclosed which includes: an oscillating device disposed between a vehicle body and the power unit, for oscillating the power unit with respect to the vehicle body; a first sensor attached to the power unit, for detecting vibration of the power unit; a second sensor attached to a member of a vehicle suspension system, for detecting vibration of the suspension member which is displaced relative to the vehicle body in response to movements of vehicle wheels; a third sensor attached to a monitoring point on the vehicle body, for detecting vibration of the vehicle body at the monitoring point; and a control device for controlling the oscillating device, based on a first reference signal and a second reference signal received from the first and second sensors, respectively, and an error signal received from the third sensor, the control device performing an adaptive control so that the error signal is minimized.

Abstract: The link includes two rigid inside tubes 4 and 5 for connection firstly to a vehicle chassis and secondly to the engine of the vehicle, a rigid hollow outer strength member 7 of composite material, said strength member 7 thus possessing two opposite walls 7a and 7b extending lengthwise, and two low-stiffness inside resilient pads 8 and 9 connecting respective ones of said inside tubes 4 and 5 to said opposite walls 7a and 7b of the outer strength member. The fibers of the composite material of the outer strength member 7 are crossed, and at least a fraction of them extend at an angle of more than .+-.30.degree. relative to the axis of the link. The link is applicable to any vehicle.

Abstract: The vehicle vibration control system comprises at least two spring constant adjustable engine mounting devices, an engine speed sensor, an engine vibration load sensor, and a controller. The controller controllably adjusts the dynamic spring constants of the engine mounting devices with reference to a stored table and on the basis of detected engine speed and engine load, to cancel vibration transmitted from an engine to the vehicle body via the two engine mounting devices. In the table, theoretically optimum load ratios and phase differences between the two engine mounting devices are listed on the basis of empirical transfer functions between the engine mounting devices and the vehicle body.

Abstract: A continuously active pressure accumulator power transfer system for a vehicle or the like comprises an engine, a pump driven by the engine, a main pressure accumulator maintained at a substantially constant fluid pressure and fluid volume by the pump during operation, a fluid motor for propelling the vehicle which is supplied with driving fluid pressure from the main pressure accumulator and a second pressure accumulator at a lower pressure then the main accumulator for supplying fluid to at least one vibration isolation mount.

Abstract: In a mounting, arrangement for an internal combustion engine with at least one row of cylinders arranged in a longitudinal direction of a four-wheel drive or a front-wheel drive automotive vehicle, which employs a front-wheel drive shaft and a front differential connected to the front-wheel drive shaft, the front-wheel drive shaft and the front differential are both arranged at the side of the engine in the vicinity of the front end of the engine block, and engine mounts for mounting the engine, are arranged rearwardly of the front-wheel drive shaft, so as to assure a shorter entire length and a shorter entire width of the power plant and to provide an optimal car weight balance between front and rear wheels.

Abstract: It is an object of the present invention to prevent an engine of an industrial vehicle from transmitting vibration thereof to a frame via an axle housing. Further, a cylindrical crosswise rubber vibration isolator is made to intervene between an engine and a vehicle frame, an output shaft of a transmission and an input shaft of a transfer are connected by a universal joint, a cylindrical crosswise rubber vibration isolator is also made to intervene between the transmission and the transfer, and brackets 33 and 34 of the rubber vibration isolator 32 are fastened together with a transmission cover 26 and a transfer cover 27, respectively.

Abstract: A motor vehicle frame having (i) a plurality of frame mounting supports enclosing an area, and (ii) an engine supporting frame releasably and directly attached to the motor vehicle frame by the frame mounting supports, the engine supporting frame having (a) at least two rigid longitudinal beams, (b) at least two transverse beams, the transverse beams being substantially perpendicularly firmly attached to the longitudinal beams, (c) devices for attaching an engine to the engine supporting frame, (d) a transmission, and (e) auxiliary devices for operating the engine and the transmission, when the engine is attached to the auxiliary devices (c) the center of gravity of the mounted engine, the transmission and the auxiliary devices is located within the area enclosed by the frame mounting supports, whereby a balanced load is provided by the engine supporting frame.

Abstract: An engine mounting for mounting an engine on the chassis of a motor vehicle has at least two fastening parts which are connected to one another with elastomeric springs. The engine mounting also has a hydraulic damping apparatus, and is configured so that the elastomeric springs have a hard shear-compression characteristic in two axes, and a soft shear characteristic in a third axis, the hydraulic damping apparatus being disposed in a direction parallel to the direction of the third axis.

Abstract: A steering column comprises a pressure tube and a piston rod extending inwards and outwards of said pressure tube. The outer end of the piston rod is connected with a steering wheel. The pressure tube at its end remote from said steering wheel is connected with a steering mechanism of a motor vehicle. The pressure tube is rotatably mounted in a bearing tube. The piston rod is axially movable but non-rotatable with respect to the pressure tube. A liquid chamber is confined within the pressure tube and has a variable volume dependent on the axial position of the piston rod with respect to the pressure tube. The liquid chamber is connectable through a pivotal connection selectively with a pressure liquid source or with a pressure liquid receiving space or can be separated from both of them. A spring acts on the piston rod and is in balance with the liquid in the fluid chamber.

Abstract: A transaxle driving apparatus for a self-propelled vehicle such as a grass-mowing lawn tractor, the transaxle comprising a two-piece housing structure forming an internal chamber for encapsulation of a hydrostatic machine and associated reduction gearing. The hydrostatic machine may comprise in one form a single hydrostatic pump driven by an input shaft rotatably supported in the housing, and fluidly coupled to two hydrostatic motors. In a modified form, the hydrostatic machine may comprise two hydrostatic motors fluidly coupled to a pumping source remotely mounted outside the transaxle.

Abstract: An engine is attached to a vehicle frame with at least one synthetic engine mount strut mounted generally axially in the principal directions of displacement resulting from engine torque. The strut provides isolation of noise and vibration from the engine and drive train, and reduces engine rotation resulting from the same. A one-piece strut member provides rigid engine-to-frame fixation, while at the same time accommodating small displacement flexing of the structure to isolate and damp high frequency vibration and noise through the use of selected material and structural geometry. The generally one-piece strut, which is pivotally fixed at one end to the engine and at the other end to the frame, can provide for insertion of a bushing surface about each hole provided for pivotal fixation.

Abstract: An engine mounting apparatus for a vehicle comprises an arm member projecting from an engine, a shell member mounted to the arm member, an insulator made of a relatively soft elastic material and received in the shell member, and a pin inserted into the insulator and mounted to a vehicle body frame. A resilient member is arranged to extend between the engine and the shell member in an elastically deformed state. One end of the resilient member is made to slidably bear against a suitable portion of the engine, whereas the other end of the resilient member is fixed to the shell member.

Abstract: A fluid mount with the capability of actively controlling the amount of vibrational energy transmitted thereacross. An actuator is provided in series or in parallel with the inertia track passageway of a double pumper isolation mount to permit the dynamic stiffness of the mount to be varied so as to control the amount of vibrational energy transmitted in a desired manner. A control system for permitting frequency-shaped force feedback control of the device is also disclosed. Utilization of the device as a tuned absorber is also described.

Abstract: A U-shaped bracket supports an elastomeric bush type vibration damping mount on a power unit (ICE plus transmission). The inner tubular member of the damper is mounted on the arms of the bracket by way of a bolt. First and second tubular piezoelectric/electrostrictive strain generating elements are symmetrically disposed about the bolt and housed within the inner tubular member of the mount. A control unit which is responsive to crank angle and engine speed, produces a AC current and applies the same to the first strain generating element. The phase of the same current is shifted by 90.degree. before being applied to the second strain generating element.

Abstract: A fluid-filled elastic mount including a first support structure and a second support structure which are spaced from each other in a load-receiving direction, an elastic body for elastically connecting these structures, and a partition structure supported by the second support structure. The elastic mount has a pressure-receiving chamber partially defined by the elastic body, first and second variable-volume equilibrium chambers partially defined by respective flexible diaphragms, and first and second air chambers for permitting the respective diaphragms to elastically deform. The pressure-receiving chamber communicates with the first and second equilibrium chambers, through respective orifice passages which are tuned to different frequency ranges of vibrations. The present elastic mount includes a pressure control device connected to the second air chamber for changing a pressure in the second air chamber.

Abstract: A vehicle engine suspension for a transverse engine has at least three engine cushions (6, 7, 8) which support the engine (3) and take up vertical loads exerted by the engine. A first torque brace (12) extends transversely to the main axis of the engine and is pivotally connected between the engine and the vehicle chassis or vehicle body. A second torque brace (21) extends transversely to the main axis of the engine (3) and is pivotally connected between the engine and the vehicle chassis or vehicle body. This second brace is located at a level beneath the first brace (12) and lies in the same upright plane as that first brace. This upright plane is disposed at right angles to a horizontal plane (H) which is the nearest common plane of the engine cushions (6, 7, 8).

Abstract: A suspension system includes an engine and transmission assembly mounted transversely in a vehicle and having a main axis of moment of inertia extending in a left and right direction of the vehicle, a single first mount located at a first end of the engine and transmission assembly and at least one additional mount located in the vicinity of an opposite second end of the assembly. The center of gravity of the assembly is located on a main axis of moment of inertia of the assembly extending between the first and second ends and is closer to the first end than to the second end. The mount is a bushing-type mount and is oriented so that the central axis of the mount extends parallel to the main axis of moment of inertia of the assembly so that the mount supports the assembly in a front and rear direction of the vehicle to suppress rocking of the assembly during acceleration and deceleration.

Abstract: A hydraulically damped engine mount includes two separate working chambers 1 which are filled with liquid and are at least in a partial area bounded by a resilient wall 2 and joined by a damping opening 4. At least one of the working chamber 1 is additionally joined to a compensating chamber 3 by means of a compensating opening 5. By means of a flexible and substantially nonelastic wall 4a, the compensating chamber 3 is suited for the pressureless reception of additional liquid. The compensating opening 5 exhibits a flow resistance which is substantially greater than that of the damping opening 4.

Abstract: A vibration damper for damping roll vibration of a power unit mounted on a vehicle body. The vibration damper is composed of a disc plate fixedly connected to the power unit in a manner that the axis of the disc plate is generally parallel with a roll axis of the power unit. The disc plate is sealingly disposed in a chamber formed in a generally circular casing which is coaxial with the disc plate. A viscous fluid is filled in a space defined between the disc plate and inner surface of the casing. The casing is formed of a plastic which has a higher linear expansion coefficient than a metal forming the disc plate, thereby allowing the space filled with the viscous fluid to expand along with thermal expansion of the viscous fluid.

Abstract: A continuously active pressure accumulator power transfer system for a vehicle or the like comprises an engine, a pump driven by the engine, a main pressure accumulator maintained at a substantially constant fluid pressure and fluid volume by the pump during operation, a fluid motor for propelling the vehicle which is supplied with driving fluid pressure from the main pressure accumulator and a second pressure accumulator at a lower pressure than the main accumulator for supplying fluid to at least one vibration isolation mount.

Abstract: A suspension system for mounting a power pack including engine, transmission, and associated equipment to the frame of a land vehicle, such as a tank. The suspension system includes static supports for substantially immovably mounting the power pack to the frame at spaced locations and at least one dynamic support for yieldably mounting the power pack. The dynamic support includes at least one vertically disposed spring member fixed to the power pack together with a linkage connecting a free end of the spring member to the frame of the land vehicle. The suspension system accommodates a range of relative movement between the power pack and the frame of the land vehicle.

Abstract: An engine mounting assembly includes a pair of rear engine mounting bracket assemblies having offset mounting surfaces, an engine flywheel housing having complementary mounting surfaces, and a front mounting bracket which together provide a three-point mounting structure resulting in a significantly lowered mounting of the engine on a forward control bus chassis. The front mounting bracket includes a single point, vibration-isolated, engine mount to a lowered frame crossmember to provide vibration isolation in any direction while the rear brackets provide vertical and fore-and-aft vibration isolation. The front mounting bracket further includes a lower mount for supporting a vehicle radiator while upper stabilizing rods connect the upper portion of the radiator to the upper portion of the engine to stabilize the desired vertical position of the radiator perpendicular to the engine fan axis.

Abstract: A power unit supporting apparatus for an automobile for supporting on a vehicle body a power unit including an engine portion having a crankshaft directed in a longitudinal direction of the vehicle body and a drive shaft extended in a lateral direction of the vehicle body for driving wheels, and further including a first elastic support device for elastically supporting on the vehicle body a first end of the power unit which is far from a compartment, a second elastic support device for elastically supporting on the vehicle body that intermediate portion of the power unit which sandwiches the center of gravity of the power unit between the first end and the intermediate portion of the power unit, and a displacement defining device provided between the second end of the power unit close to the vehicle room and the vehicle body to resiliently restrain a vertical displacement of the second end in an amount more than a predetermined level, wherein the spring constants of the first and second elastic support devic

Abstract: A control system performs control for adjusting spring coefficient of an engine mount in order to set a resonance frequency out of a frequency band of vibration generated on a vehicular body due to roughness or undulation on a road surface. In order to enable this, vehicle driving parameters associated with the vehicle body vibration are monitored so as to perform control of the spring coefficient based thereupon.

Abstract: A hybrid type vibration isolation mounting apparatus for supporting a first member at a second member, and including a passive vibration absorbing device, such as a typical rubberized engine mount, located between the first and second members, and an active vibration actuator for applying counter vibration isolation forces in parallel in response to the detected relative vibration of the first and second members, wherein the actuator is located on a support mount frame attached to the second member. The support mount frame provides a structure for the actuator force application, with continuous transfer of static loads between the first and second member being provided by the passive device. In its preferred embodiment, the apparatus is utilized in conjunction with vehicle engine mounts wherein the first member comprises the engine and the second member comprises the vehicle frame.

Abstract: A chassis mount for a vehicle having a chassis and a wheel suspension includes an approximately frustoconical rubber body having a lower surface and being retained in the chassis. A central bushing is disposed inside the rubber body. A bolt has ends and is guided in the central bushing. A fork structure articulatingly connects the ends of the bolt to the wheel suspension. A hydraulically damping mount element has two liquid chambers communicating with one another through an overflow conduit. The chambers include a working chamber with an upper surface. The hydraulically damping mount element is mounted as a modular component onto the lower surface of the rubber body with the lower surface of the rubber body forming the upper end surface of the working chamber.

Abstract: The status of a lock-up clutch included in an automotive power unit T/C is monitored. In the event that the lock-up clutch is partially locked up or conditioned to produce so called "slip lock-up", ERF (electroheopectic fluid) filled engine mounts are conditioned to produce an increased amount of rigidity, while in the event that the lock-up clutch is fully engaged the engine mounts are induced to assume a more flexible state.In addition to this engine idling and shake, vibration can be attenuated by sensing the relative displacement between the power unit and the chassis.

Abstract: A damper used to damp roll vibration of an automotive power unit includes housing in which a disc is immersed in a highly viscous liquid, and a linkage which has universal joints formed at each end thereof. The linkage induces relative rotation between the housing and the disc. A resilient vibration attenuating arrangement is included in one or both of the universal joints for insulating the vehicle chassis from vibration which tends to be freely transmitted through the damper per se and cause cabin reverberation noise.

Abstract: A passive mechanical damping system, particularly for the suspension of a cab from a truck frame, provides a minimal level of damping force to impede the free movement of a truck cab about its nominal height and also provides higher levels, progressively or in discrete steps, of damping as the movement of the cab exceeds preset limits of displacement defined by a lost motion connection to provide maximum vibration isolation while providing additional damping to control cab movement when the preset displacement limits are exceeded. The system provides a low rate viscous damper continuously connected between the cab and the truck frame and a high rate viscous damper connected therebetween through a lost motion connection.

Abstract: A structure for mounting a suspension member for supporting suspension control arms to the vehicle body with high resiliency in the longitudinal direction of the vehicle but high rigidity in the lateral direction as well as in turning as viewed from a top of the vehicle or as viewed in the longitudinal direction of the vehicle, the structure including substantially cylindrical elastic bushes disposed between the suspension member and the vehicle body to extend in the longitudinal direction of the vehicle and assist links restricting lateral shifting of longitudinal end portions of the suspension member relative to the vehicle body.

Abstract: A mounting of an internal combustion engine which has V-shaped cylinder rows and is installed transversely into the body of a passenger motor vehicle. The internal combustion engine is suspended at two bearing supports and is supported with respect to the body by means of two torque supports.

Abstract: Hydraulically damping elastic bearing, in particular engine mounts for motor vehicles, with two rigid end walls opposite one another in the axial direction and at least two chambers containing damping fluid arranged axially one behind the other, whereby the chambers are connected for fluid communications with one another by a passage running in an annular fashion. For the variable modification of the length of the passage, partitions are inserted in the component containing the passage, which partitions divide the passage into individual passage segments connected for fluid communication with one another by an opening.

Abstract: The support is so arranged as to have a wider damping characteristic. For this purpose, it comprises two expansion chambers connected to the same work chamber by ducts having different characteristics so that the liquid contained in these ducts is put into resonance at different frequencies. The two expansion chambers are disposed concentrically to each other on the same side of the work chamber and are defined by a separating partition and by a single diaphragm.

Abstract: Antivibration isolation device with hydraulic damping of radial elasticity, consisting of four concentric tubes bonded two by two to the elastic lateral walls, which by simultaneous fitting form two chambers connected by a long laminar passage for an inertial damping fluid, shunted by limited deformation of a thin membrane, to modulate the apparent dynamic rigidity as a function of the frequency. Process for the realization of such a device. The object of the invention is to provide antivibration isolation for machines or motor vehicles.