With electronic or magnetic control

An assembly for adaptively controlling vibration, shock, acceleration and position of an item mounted to the assembly independent of varying operating characteristics of the item or a support base for the assembly is provided. The assembly comprises an item to be controlled, a support platform for supporting...     

A mount, for example for mounting an engine in a vehicle, has a resilient vibration isolator and, separate therefrom, an electro-magnetically controllable vibration-damping arrangement. In this way, the damping can be controlled independently of the isolation, for example in response to the amplitude...     

A damper device including first and second support members, one of which is fixed to a support element and the other of which is fixed to a suspended element, an elastic block made of a deformable, elastic material for elastically coupling the two support members and a sealed space formed therein filled...     

A mounting structure disposed between a body and a power unit of a vehicle, including a cylindrical housing having two cavities on opposite side of a partition member, and a first and a second elastic member which close open ends of the cavities to form a first and a second variable-volume fluid chamber...     

A vibration-proofing device according to the present invention includes at least one fluid chamber in which fluid is filled between a vibrating member and a vibrated member. The fluid chamber is formed which expands and contracts from the vibration of the vibrating member. In the fluid within this fluid...     

An improved power unit mounting device capable of dumping in a wide range of frequency of vibration. The device having an inner liquid chamber comprises an auxiliary chamber provided on a chassis separately from the mounting device proper. The mounting device proper is formed with the inner chamber communicating...     

A hydraulic engine mount comprising two fluid-filled chambers normally communicating with each other to affect a controlled throttled exchange of fluid between them sufficient to absorb relative movements of high frequency low amplitude between an engine and a chassis. Relative movements of high amplitude...     

A single degree of freedom suspension element exhibiting substantially zero natural frequency of vibration with electronically controllable response comprising the combination of a mechanical spring and an "electromagnetic spring" which axially supports a mass located on a base. The electromagnetic spring...     

A dual-chamber support bed or motor vehicle engine mount with hydraulic cushioning includes a resilient housing part and a support base for use in defining a working chamber and compensating chamber filled with liquid, the housing walls are annular rubber diaphragms with a buckling characteristic that...     

A hydraulic mount assembly is disclosed having a partition including a hydraulic 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...     

A hydraulic mount assembly includes a pair of mounting members connected to each other through a hollow elastomeric body of natural or synthetic rubber. 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...     

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...     

A vibration preventing apparatus using fluid includes a main and an auxiliary fluid chamber in which fluid is confined. The main and auxiliary fluid chambers are communicated to each other by three kinds of orifices which exert different degrees of resistance to the flow of fluid. Two of such orifices...     

An anti-vibration apparatus includes an expandable liquid chamber, an electrorheologic fluid contained in the liquid chamber, a partition wall for separating the liquid chamber into a plurality of small liquid chambers, and an orifice communicating the small liquid chambers. The orifice comprises an...     

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...     

A spring for resisting relative movement of parts and for urging the parts to an initial, equilibrium position when the parts are moved therefrom includes a cylindrical hub concentric within an outer cylinder. The hub is fixedly connectable to one part and the outer cylinder is fixedly connectable to...     

A two-chamber engine mount has a working space and a compensation space which are filled with liquid and connected by a choke aperture having the shape of a canal. The inlet and outlet openings of the choke canal are rigidly related to the choke canal and define its beginning and end. At a distance from...     

A vibration isolator mounted on a support for a vehicle engine or the like which is a vibration source, in which a central limitational passage is formed in a partition wall which divides a fluid chamber filled with a fluid into a pair of small fluid chambers, the central limitational passage providing...     

In an antivibratory support interposed between two rigid elements (1-3 and 4-5) and comprising a work chamber (A) and a compensation chamber (B) separated by a dividing wall (8) with a mobile valve (10) and connected together by a restricted passage (9), a rotary cam (13) is provided immersed in the...     

This invention relates to a hydraulically damping elastic bearing, in particular engine mounts for motor vehicles, with two fastening devices opposite one another, an elastomer resilient body between them, and a controllable electromagnet located on one fastening device, consisting of coil and armature,...     

An anti-vibration apparatus includes an expandable liquid-chamber, an electrorheologic fluid contained in the liquid chamber, a partition wall for sepatating the liquid chamber into a plurality of small liquid chambers, and an orifice communicating the small liquid chambers. The orifice comprises an...     

A shock absorber including a main housing body having a cylindrical portion and closure portions closing the open ends of the cylindrical portion, an inner cylindrical member disposed within the main body and cooperating therewith to define an inner cylinder chamber and an outer annular space, and a...     

A vibration damping device disposed between a vibrating body such as an internal combustion engine and a base such as a vehicular chassis, comprises an accelerometer which is mounted on the vibrating body and detects an acceleration in the vertical direction of the vibrating body, and a control unit...     

A hydro-elastic support mounted between two mechanical elements, subjected to excitations of variable frequencies, and able to provide two levels of stiffness by simple outside control includes an elastic vault adapted to be fastened to one of the mechanical elements, a support adapted to be fastened...     

A vibration isolating apparatus interposed between a vibration-occurring portion and a vibration-receiving portion includes a liquid chamber partitioned into a plurality of small liquid chambers, an orifice allowing the small chambers to communicate with each other, and an electroviscous fluid filled...     

A hydraulically damped rubber mounting in which a liquid filled working chamber 1 is bounded in at least a first partial area by a plate 3 which is made of a magnetizable material and supported on a spring 2. Depending upon the parameters, the plate 3 can be moved back and forth in direction of the working...     

An ERF (electrorheopectic fluid) filled engine mount has a main working chamber and first and second auxiliary chambers. An orifice passage structure provides fluid communication between the main and first auxiliary chambers. A first set of electrode plates are disposed in the orifice passage structure...     

A fluid control valve of "Wheatstone Bridge" arrangement for use with electrorheological fluids comprises a plurality of channel plates and printed circuit board plates alternatingly stacked together. Electrodes are printed on the printed circuit board plates to form walls on sides of channels formed...     

A hydraulic antivibratory support is disclosed comprising two rigid frames, an elastomer structure forming therewith two sealed chambers, a restricted passage causing the two chambers to communicate permanently with each other, a liquid mass filling the two chambers and the restricted passage, a rigid...     

A hydraulic antivibratory device is disclosed in which the restricted passage joining together the two chambers (A, B) comprises three portions (4, 5, 6) mounted in parallel, namely a first portion (4) whose flow section remains constant and two other portions (5, 6) whose flow sections are adjustable...     

In order to improve vibration attenuation (during engine shake and idling for example), reduce power consumption and increase the longevity of elements associated with the application of a high voltage to electrodes which control the viscosity of an ERF in an orifice passage, the rate at which the ERF...     

An engine mount includes a housing connectable to a vehicle chassis and a hub connectable to a vehicle engine. The hub is movable relative to the housing toward and away from each other. A fluid chamber is located between within the hub and the housing and has magnetic fluid contained therein. An inner...     

A vibration damping device is comprised of first and second axially spaced end housings adapted to be mounted on spaced apart structures, and has a tapered intermediate member mounted on the second housing converging toward an open end of the first housing. A piston is mounted on an end of a rod which...     

The invention relates to a hydraulic antivibratory device comprising a rigid core, a rigid circular base and an annular supporting elastic wall sealingly connecting the core to the base, the inner space of the box so formed being filled with liquid L and the core being extended inside the box, by a rigid...     

The invention proposes a hydroelastic support intended to be interposed between two assemblies to be suspended by one with regard to the other, especially for the suspension of an engine in a motor vehicle, of the type comprising two armatures connected respectively to the two assemblies, these two armatures...     

A self-expanding mount controls transmission of vibration of a vibration source to a base. A main liquid chamber is defined between a resilient member fixed to the vibration source or the base and a casing fixed to the base or the vibration source. A metallic bellows is driven in response to a first...     

A hydroelastic mounting for interpositioning between two assemblies to be suspended with respect to one another, for example in suspending an engine in an automobile, has its components arranged in the general direction of stress on the mounting. The components include a first armature, a working chamber...     

A vibration isolating device comprises a base, a plurality of support members each placed onto the base and comprised of a two series layer of an electroviscous body and an elastomeric body, and a cradle supported through these support members. These support members are provided with circuit for applying...     

A hydraulic damping device for preventing the transmission of vibrations of wide-ranging frequencies. The device includes a thick vibration damping rubber body which defines a main liquid chamber therewithin, first and second deformable rubber diaphragms which respectively define first and second auxiliary...     

A vibration control system controls transmission of vibrations from a vibration source to a base. The vibration control system comprises a vibration control assembly. The vibration control assembly has a bracket fixed to the vibration source, a pair of driving members holding the bracket therebetween...     

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...     

This invention relates to sealless designs of magnetorheological fluid dampers. With these sealless designs a piston rod extends above and below a piston head within a cylindrical housing and has frustoconical elastomer elements attached to and between the rod and housing to allow translation of the...     

A power unit mounting device for a motor vehicle includes a first plate, a second plate secured to the vehicle body and a bracket member having a flat plate portion which is disposed between the first and second plates. A first active damping actuator is intimately disposed between the first plate and...     

A hydraulic anti-vibration support includes a rigid frame 3, a head 1, a frustoconical elastomer wall 6 connecting the cylinder to the head, a membrane 7 carried by the cylinder, a partition 8 separating the inside of the resulting liquid-filled enclosure into a working chamber A and a compensating chamber...     

A vibration isolating apparatus. A first diaphragm and a second diaphragm form portions of partitioning walls of a first sub-liquid chamber and a second sub-liquid chamber, respectively, and are provided so as to permit expansion of the first sub-liquid chamber and the second sub-liquid chamber. A first...     

A rubber bearing, in which a liquid-filled working chamber is bounded by an expanding member and by a compensating wall that is capable of moving back and forth in the direction of the working chamber, wherein the compensating wall consists at least partially of a material that is capable of being moved...     

A vibration damping apparatus which is particularly applicable to an automotive engine mount and capable of fully absorbing vibration from vibration generating sources. A sleeve is secured to the automotive engine unit, and a housing is secured to the vehicle body. Once the vibration generated by the...     

A displacement magnifying device for magnifying the displacement of a piezoelectric element according to an applied voltage, is applied to a vibration absorber and an actuator. The device includes a member for supporting the element, a first elastic sealing member forming part of a sealed chamber containing...     

A self-expanding mount controls transmission of vibration of a vibration source to a base. A main liquid chamber is defined between a resilient member fixed to the vibration source or the base and a casing fixed to the base or the vibration source. A metallic bellows is driven in response to a control...     

A vibration damping device comprises two cylindrical and flexible membrane members, a restricted passage constituting member connected at both end portions to these membrane members, two face plates connected at their end portion to the membrane members, a closed chamber defined by these members and...     

A vibration isolator includes: a housing which is filled with a fluid; an intermediate plate inserted in the housing for partitioning the interior of the housing into two liquid chambers, the intermediate plate having therein a cylinder and at least two passageways for allowing the two liquid chambers...     

A liquid-sealed type vibration isolator has a resilient member disposed between the a mounting member, connected to one of a vibration-generating portion and a vibration-receiving portion, and a second mounting member, connected to the other one of the vibrator-generating portion and the vibrator-receiving...     

A vibration isolation apparatus comprises an outer cylinder connected to one of a vibration producing portion and a vibration receiving portion, an inner cylinder connected to the other of the vibration producing portion and the vibration receiving portion, and an elastic member which is disposed between...     

A sealless magnetorheological fluid device is disclosed in the form of an engine mount which comprises a baffle plate (58) and a solenoid type coil (40) wrapped within a housing (20). The baffle plate diverts the flow of fluid into a more intimate contact with the coil to influence the characteristics...     

A controllable motor bearing consisting of a journal bearing and a support which are connected parallel to one another by means of a first and a second spring element made of rubber. One of the spring elements can be locked in place by an auxiliary mechanism, if necessary. The first spring element is...     

A hydraulic antivibration device comprises, between its two chambers, two passages (8, 10) connected in parallel, and it also comprises a rotary shutter (11) having the same axis (X) as the device and suitable for opening or closing, at will, at least one of the two passages and also slots that put the...     

An active isolator with a closed-loop feedback control system which uses an actuator in parallel spring relation to a static load spring to control the dynamic vibration transmitted from a vibrating device over a broad band frequency range. A collocated sensor is installed to sense the vibration of the...     

An active vibration damper for a reciprocating machine part, comprising an inertial mass that can be displaced in the direction of the reciprocating motion and a support plate that can be fastened to the machine part. The inertial mass and the support plate are connected to one another by a spring element....     

A vibration isolation system comprises four tunable dual-axis hydraulic inertial isolators, an array of accelerometers, and a controller. The controller inputs signals from the accelerometers and outputs signals to tune the isolators to minimize the vibration transmitted from a vibrating body to an isolated...     

A hydraulic inertial vibration isolator is connected between a vibrating body and an isolated body. The vibration isolator comprises a cylinder which includes two chambers and a piston therebetween. The chambers are connected by a tuning passage in which a solid tuning slug is slidably disposed. The...     

A vibration isolator designed to improve mounting facility is disposed between a vibration source and a base on which the vibration source is supported. The vibration isolator has an elastic member provided between the vibration source and the base to elastically support the vibration source, a main...     

A liquid-sealing type vibration-isolating device has a primary fluid chamber and a subsidiary fluid chamber which communicate with each other through a short idle orifice and a long shock orifice, and a switch-over valve for connecting the primary and subsidiary fluid chambers with each other through...     

An active elastic mount for the insulated mounting of an assembly affected by vibration, in particular an internal combustion engine in a motor vehicle, includes an active decoupling system disposed on an insulated side of the mount. The active decoupling system has a permanent magnetic field. A coil...     

The hydraulic antivibration device is designed to be interposed between the body (9) and the engine (10) of a vehicle. It comprises an annular rigid strength member (1), a rigid rod (2) passing through the strength member, an annular spring (3) resting on the strength member and interposed between the...     

There is provided a vibration damping device comprising a flexible body fing an enclosed chamber, a plurality of electrically conductive members located within the chamber and spaced from each other along a common axis, the common axis being parallel to an inside surface of the flexible body. A fluid...     

A mount assembly for a vibrating component, which mount includes a supported mount supported on a machine part; a supporting mount supported via a spring element on the supported mount; and an inertial mass, movable back and forth by a drive in a direction parallel to the direction of the vibrations...     

An active, vibration-countering mount assembly for a vibrating component is disclosed. The mount assembly comprises a supported mount supported on a machine element, a supporting mount supported via a spring element on the supported mount, and an inertial mass, movable back and forth by means of a drive...     

A device using an electrorheological fluid filled in a fluid enclosing space comprises passages or fins for cooling the electrorheological fluid disposed around the fluid enclosing space and is useful for a vibration damper, a clutch, an engine mount, a shock absorber and the like. The power consumption...     

A liquid-sealed mounting device that can suitably attenuate and cut off various vibrations of an engine, reduce the number of parts and components necessary, and reduce the energy consumed by the actuator by lowering the operation ratio thereof. The liquid-sealed mounting device includes an upper liquid...     

In the active pneumatic mount disclosed herein, a bellows or other flexible sealing means is utilized for containing a volume of pressurized gas which supports the weight of the equipment which is to be isolated. Within the pressurized volume is a means defining a chamber having an opening for receiving...     

A control type vibro-isolating support includes a pulse signal generator for generating reference signals x, which represent the state of the vibration being generated by an engine. An acceleration sensor detects residual vibration on the support member side, and generates a residual vibration signal...     

An actuator having a linear current force characteristic comprises a moving coil transducer and a hydraulic lever. The moving coil is capable of producing only a relatively low force but with a relatively large displacement. The coil is formed on a piston which acts as an input piston to a hydraulic...     

An engine mount includes upper and lower bearing plates and a hollow-cylindrical support spring being formed of an elastomer and being fastened between the bearing plates. A cup-shaped housing adjoins the lower bearing plate. An inner hollow chamber is defined by inner wall surfaces of the hollow-cylindrical...     

A vibration damping system for a vehicle includes a vibration sensor which detects vibration of a predetermined vibrating element on the vehicle, a vibrator which vibrates the vibrating element, and a drive control unit which controls the vibrator on the basis of the detecting signal from the vibration...     

A vibro-isolating support includes an inner tubular member having a top portion, from which a conical wall extends downwardly and inwardly. An elastic support material is bonded to the inner surface of conical wall. The bottom portion of the conical wall curves radially outwardly so that the inner tubular...     

The active vibration-absorber is, in particular, an engine mount for motor vehicles. A magnet system has a magnet casing which receives a permanent magnet and which is guided in the assembly so as to be capable of movement in the axial direction. An electrical moving coil projects perpendicularly from...     

A system (20) which includes a frequency-dependent decoupler (21) arranged in a series-spring relationship with an actuator (26) for supplying active forces to cancel vibration. The system (20) also includes a spring (28) for providing a primary load path. The system (20) is responsive to at least one...     

The vibration isolation device of this invention is to be interposed between a vibrating body and a vibrated body, characterized in that at least one of the vibrating body and the vibrated body is fastened to the surface of a vibration isolating device which is abutted against it through a piezoelectric...     

A mounting member fixed to an engine and a mounting member fixed to a vehicle body are interconnected by a hollow elastomeric block which has a variable-volume primary fluid chamber defined therein. A subsidiary fluid chamber having a diaphragm on a portion of an outer wall thereof communicates with...     

A vibration isolation system comprises four tunable dual-axis hydraulic inertial isolators, an array of accelerometers, and a controller. The controller inputs signals from the accelerometers and outputs signals to tune the isolators to minimize the vibration transmitted from a vibrating body to an isolated...     

This invention relates to laminated composite structure elements containing electrodes, flexible laminae which may also serve as electrodes, and an electrorheological fluid located between the flexible laminae. The rheological properties of the electrorheological fluid and its cohesive force with solid...     

This is a hydraulic anti-vibration mount intended to be interposed between a vehicle body and an engine and in particular comprising an armature which can be secured to the body, a head which can be secured to the engine, a thick frustoconical wall linking a circular bearing surface of the armature to...     

A vibration isolating apparatus is provided which absorbs vibration over a wide frequency range. A main fluid chamber and a first sub-fluid chamber are separated from each other by a partitioning member and communicates with each other by a first restricting passage. The main fluid chamber and a second...     

Briefly, according to this invention there is provided a viscous fluid mount for interconnection between a vibrating body and a base. The viscous fluid mount includes a chamber, a high viscosity damping fluid contained within the chamber and a flow resistance device. Input energy from the vibrating body...     

A vibration isolating apparatus includes: a first mounting member; a second mounting member; an elastic body provided between the first mounting member and the second mounting member; a main fluid chamber, the elastic body forming a portion of a partitioning wall of the main fluid chamber such that the...     

A controllable vibration apparatus having an electrical connection to a controllable valve made through a single-strand electrical conductor. In one embodiment, the piston and rod are preferably used as the source of ground or return electrical path. An axially compressed sealing element provides radial...     

According to one aspect of the invention, a magnetorheological fluid (MRF) damping device includes two concentric coils or groups of coils arranged to produce respective magnetic fields that mutually cancel substantially everywhere but within the gap between them. The rheological properties of the MRF...     

The inventively advanced mount accommodates a conventional mount (such as an air mount) so as to include, at the mount's foundation-securing plate, at least one motion sensor and at least one vibratory actuator. Each sensor is correlated with an actuator. For each sensor-actuator pair, the electrical...     

The invention is uniquely "passive-active" in that it brings to bear, sequentially and complementarily, passive vibration control followed by active vibration control. A conventional mount (such as an air mount) is accommodated so as to include, at the mount's foundation-securing plate, at least one...     

A fluid sealed type vibration insulating device which is interposed between a vibrating object and a structural member and generates controlled vibrations for reducing vibrations of the structural member caused by the vibrating object. The vibration insulating device includes a controller which judges...     

The hydraulic antivibration support has two rigid strength members interconnected by a bell-shaped elastomer body, a flexible elastomer wall connected to the second strength member, and a rigid partition secured to the second strength member and defining both a working chamber on its elastomer body side...     

A damping apparatus comprises an actuator consisting of an oscillating element for transforming an electric oscillation into a mechanical oscillation and an amplifying mechanism for amplifying the resulting mechanical oscillation as interposed between two structures at least one of which is a source...     

There is provided a vibratory feeder comprising an exciter for exciting the vibratory feeder and a damper assembly which is selectively activated. There is also provided a vibratory feeder comprising an exciter and a controllable viscosity fluid damper which is activated at a first level to reduce the...     

A fluid sealed type vibration insulating device provided with an actuator for generating an active supporting force. The vibration insulating support device includes a main fluid chamber defined by a cylindrical elastic support and a movable plate connected to a plate spring. The actuator moves the movable...     

A fluid-filled Active Vibration Absorber (AVA) (20) is described for attaching to, and controlling dynamic vibration of the member (22). The AVA (20) is comprised of primary tuning mass (23) preferably including an additional inertial tuning mass (26) which is associated with a primary resonant frequency...     

An active fluid mounting for isolating vibration between a vibrating member (21) and a structure (23). In one aspect, the active fluid mounting (20) includes an inner member (22), an outer member (24), a first flexible element (26), and an cartridge-like active fluid element (28) which is unitary and...     

An ETVA (electrically-tunable vibration absorber) has a vibratable mass with a mechanical spring suspension supplemented by an electromagnetic spring simulation that can be adjusted electrically to vary the self-resonant frequency of the vibratable mass and tune it to a disturbing frequency that is to...     

A controllable magneto-rheological damper includes a housing; a piston moly disposed in the housing; a cavity defined by the housing and the piston; a passage fluidically coupled to the cavity; a magneto-rheological fluid contained within the cavity, wherein motion of the piston is damped by flow of...     

The present invention is a vibration isolating apparatus, comprising: an elastic body which is connected to one of a vibration generating portion and a vibration receiving portion and which is elastically deformed when vibration is inputted; a liquid chamber forming member which forms a liquid chamber...     

A hydraulic mount is operable in soft and firm modes and includes a valve positioned at the partition between the working chamber and the reservoir. A normally open fluid path extends through the partition and opens between the working chamber and the reservoir for soft operational characteristics useful...