Abstract: A fluid filled type cylindrical vibration damping device, wherein a circumferential end of a stopper member is formed as a mating element smaller in diameter than a circumferentially center section of the stopper member, and is juxtaposed against and supported on a bottom face of a mating groove in a communication passage, to form the communication passage along an entire area between diametrically opposed faces of the mating element and an outer tubular member. A cutout portion is formed extending in a circumferential direction from a circumferential end in a widthwise medial section of the mating element, with the communication passage opening into and communicating with a first fluid chamber at a distal end section of the cutout portion, and at two widthwise side sections of the mating element, respectively, thereby defining an orifice passage connecting the first fluid chamber with a second fluid chamber.

Abstract: A Fluid-filled type vibration damping device, which is configured to be free from the necessity of supplying a continuous application of electricity to a coil so as to maintain a movable valve body in either an opened state or a closed state, is provided. The device includes a cam mechanism, which transmits a rotational drive force of a motor to the movable valve body in the form of a reciprocating drive force. In the device, a first rotation angle switch is connected to a first control switch in series relative to a motor coil, and a second rotation angle switch is connected to a second control switch in parallel relative to the first switch. The first rotation angle switch is turned on in a state of a first angular range ?1, and the second rotation angle switch is turned on in a third angular range ?3. When the first control switch and the second control switch receive the same control signal, they are brought into respective inverted ON/OFF states.

Abstract: A damper includes a hollow outer elongated body; a hollow inner elongated body; a liquid viscous body or liquid viscoelastic body disposed in a gap between an inner surface of the elongated body and an outer surface of the elongated body in such a manner as to be in contact with the inner surface and the outer surface of these elongated bodies, respectively; and first and second attaching structures. Further, a controller may be provided to control an increase or decrease in the internal pressure of the liquid viscous body or the liquid viscoelastic body.

Abstract: A vibration isolator which is capable of stably opening and closing an orifice is provided at low manufacturing cost. A plunger for opening and closing an idle orifice is disposed in a manner that is slidably engaged with the inner wall surface of an orifice-forming member. A shaft portion extending downward is formed in the central portion of the plunger. A convex portion which is formed with a through-hole in which the shaft portion is slidably is provided on the bottom of the orifice-forming member so as to provide a bearing portion. The shaft portion of the plunger and the bearing portion of the orifice-forming member constitute a guide member for guiding the reciprocating motion of this plunger.

Abstract: A fluid-elastomeric damper assembly operable for damping relative motion between a first structure and a second structure including a housing structure grounded to the first structure and a plurality of elastomer seals coupled to the housing structure, the housing structure and the plurality of elastomer seals defining a fluid-elastomeric chamber operable for containing a fluid. The fluid-elastomeric damper assembly also including one or more piston structures disposed within the housing structure and the fluid-elastomeric chamber, the one or more piston structures grounded to the first structure and driven by the second structure, and the one or more piston structures each including a first substantially fluid-filled chamber and a second substantially-fluid-filled chamber in communication via an orifice, the first substantially fluid-filled chamber and the second substantially fluid-filled chamber also in communication with the fluid-elastomeric chamber.

Abstract: A fluid-filled cylindrical vibration-damping device including a main rubber elastic body elastically connecting an inner shaft member and an outer cylindrical member with each other. A pair of first fluid chambers are formed on diametrically opposite sides of the inner shaft member and a pair of second fluid chambers are formed being diametrically opposed to each other such that an opposing direction of the second fluid chambers is orthogonal to an opposing direction of the first fluid chambers. Each partition wall that partitions the first fluid chamber and the second fluid chamber extends in a direction in more proximity to the opposing direction of the first fluid chambers than to the opposing direction of the second fluid chambers so that spring rigidity as measured in the opposing direction of the first fluid chambers is set greater than spring rigidity as measured in the opposing direction of the second fluid chambers.

Abstract: A fluid filled type vibration damping device includes a fluid chamber divided by a partition member into a pressure-receiving chamber and an equilibrium chamber. The partition member has a first and a second member axially superposed together. A locking projection is formed on one of the first member or the second member and a locking hole is formed on an other, with the locking projection being inserted through the locking hole to effect locking so as to constitute a locking mechanism for holding the first and second member in a superposed state. Outer circumferential faces of the first member and the second member held in the superposed state by the locking mechanism are fastened fitting into a second mounting member via a seal rubber layer, and the first or second member having the locking hole includes a cover portion that covers an opening of the locking hole from a side thereof to which the locking projection projects.

Abstract: A cylindrical fluid-filled elastic mount which has a structure that avoids or mitigates a deterioration of damping effect, when an outer cylindrical member is subjected to a diameter-reducing operation. A cylindrical fluid-filled elastic mount including; a communication groove connecting a pair of pockets in the circumferential direction formed in an elastic body; fluid chambers provided by the corresponding pockets; an orifice member having a trough-form protrusion in which both-side wall portions provided at an end of the orifice groove are formed by an elastic material. The trough-form protrusion is inserted in the communication groove. At least one hollow groove is provided along the communication groove where the trough-form protrusion is inserted, and the hollow groove is formed longer in the circumferential direction than a length of a protrusion part of the trough-form protrusion.

Abstract: A dust boot retention system includes a jounce bumper having an end portion with an outer diameter and an annular recessed groove adjacent to the end portion. A dust boot is attached to the jounce bumper and has an upper flange including a radially inwardly extending portion and an axially extending portion extending from an innermost portion of the radially inwardly extending portion. The axially extending portion has an inner diameter smaller than the outer diameter of the end portion of the jounce bumper. A rate ring secures the dust boot to the jounce bumper. The rate ring includes an inner diameter smaller than the outer diameter of the end portion of the jounce bumper. The rate ring includes an annular recessed channel in a first end thereof for receiving the axially extending portion of the dust boot.

Abstract: A vibration isolator which is capable of stably opening and closing an orifice is provided at low manufacturing cost. A plunger for opening and closing an idle orifice is disposed in a manner that is slidably engaged with the inner wall surface of an orifice-forming member. A shaft portion extending downward is formed in the central portion of the plunger. A convex portion which is formed with a through-hole in which the shaft portion is slidably is provided on the bottom of the orifice-forming member so as to provide a bearing portion. The shaft portion of the plunger and the bearing portion of the orifice-forming member constitute a guide member for guiding the reciprocating motion of this plunger.

Abstract: A fluid-filled type engine mount having a pressure receiving chamber and an equilibrium chamber connected together through a first orifice passage, and an intermediate chamber connected to the equilibrium chamber through a second orifice passage. The intermediate chamber is partially defined by a movable film, and the pressure-receiving chamber and the intermediate chamber are situated to either side of the movable film. The movable film is a tabular rubber elastic body, and is imparted with non-linear spring properties in response to elastic deformation in a width direction thereof so that its deformation during input of idling vibration occurs in a low spring properties zone, whereas its deformation during input of vibration of greater amplitude than the idling vibration in a higher frequency range than a resonance frequency of the first orifice passage reaches a high spring properties zone.

Abstract: A hydraulic mount has an upper support member and a lower support member. An upper elastomeric spring and a lower elastomeric spring are disposed between the upper support member and the lower support member to define an upper fluid chamber and a lower fluid chamber. A channel extends between the upper and lower chambers. During compression and extension of the hydraulic mount, fluid transfers between the upper and lower chamber to provide a damping force for the hydraulic mount.

Abstract: A fluid filled type vibration-damping device including: an elastic body connecting a first and second mounting member and sealing off one opening of the second mounting member; a flexible film fluid-tightly sealing off an another opening of the second mounting member; a partition member firmly fitted into the second mounting member thereby forming a pressure-receiving chamber partially defined by the rubber elastic body and an equilibrium chamber partially defined by the flexible film, which communicate together via an orifice passage; a short circuit passage is formed to connect the two chambers, and a valve body placing the short circuit passage in a communicating state on a basis of elastic deformation of the elastic body when an excessive pressure differential arises between the two chambers.

Abstract: The damping is device intended to form a drag-mode damper for a helicopter blade, and is incorporated in an aircraft rotor system. This damping device comprises: an external frame intended to be coupled to a first rotating element, and a radially internal element mounted coaxially to the frame and intended to be coupled to a second rotating element; at least one elastomer damper of annular cross section mounted fixedly to the frame and to the internal element; and a working chamber bounded by the frame and by the damper and communicating with a compensation chamber bounded by a highly deformable flexible member mounted coaxially to the internal element. The working chamber is formed at a first end of the device and communicates with the compensation chamber via a porous structure surmounting an end opening of the flexible member, which member is mounted in the internal element.

Abstract: A damper includes a hollow outer elongated body; a hollow inner elongated body; a liquid viscous body or liquid viscoelastic body disposed in a gap between an inner surface of the elongated body and an outer surface of the elongated body in such a manner as to be in contact with the inner surface and the outer surface of these elongated bodies, respectively; and first and second attaching structures. Further, a controller may be provided to control an increase or decrease in the internal pressure of the liquid viscous body or the liquid viscoelastic body.

Abstract: A hydraulically damped mounting device has a first anchor part in the form of a tube and a second anchor part in the form of a ring around the tube, which ring is connected to the tube by a resilient wall. The device has a working chamber for hydraulic fluid partially bonded by the resilient wall and connected to a compensation chamber by a passageway. The chamber is partially bounded by a flexible bellows which may have a ribbed surface. The first anchor part may also include a helmet extending over the flexible bellows, which helmet is in abutting non-bonded contact with the tube. The second anchor part may have components forming a support arc to which the resilient wall is attached and a radially inner positioning arc.

Abstract: A hydraulic antivibration device capable of sufficiently reducing strange sounds is provided. The one in a first embodiment includes first ribs whose tops are spaced apart from lattice members and second ribs having tops abutting on the lattice members and a smaller rib width than the first ribs. When an elastic partition membrane impinges on the lattice members with vibration, the second ribs resist and the elastic partition membrane impinges moderately on the lattice members, so that strange sounds can be reduced. In a second embodiment, such first and second displacement-regulating protrusions are provided that are disposed asymmetrically relative to a phantom plane passing through a center of the elastic partition membrane in its thickness direction.

Abstract: A spring seat of a suspension for an automotive vehicle, which is capable of preventing occurrence of noises and preventing buckling deformations thereof has a spring seat body composed of an elastic rubber body. The spring seat body is interposed and pressed between a coil spring and an opposed member. This spring seat body has a plurality of non-through holes which are formed so as to be directed toward a first surface of the spring seat body from a second surface located on the side of the opposed member, and which have openings on the side of the second surface. In addition, the spring seat body has air passages connecting the non-through holes with the surface of the spring seat body other than the second surface on the side of the opposed member.

Abstract: A powertrain mount comprises an upper orifice plate, a lower orifice plate, and a generally planar diaphragm having an enlarged central node. The central node is in constant contact with the upper orifice plate and in contact with the lower orifice plate. A periphery of the diaphragm is free to move between the upper orifice plate and the lower orifice plate.

Abstract: A liquid sealed vibration isolating device having a first mounting member to be mounted on the side of a vibration source, a second mounting member to be mounted on the side to be vibrated, and an insulator being placed between said first and second mounting members so as to absorb vibration. A liquid chamber uses the insulator as a part of a wall thereof and is filled with a hydraulic liquid. A partition member partitions the liquid chamber into a primary liquid chamber and a secondary liquid chamber. A passage is provided between the primary and secondary liquid chambers. A valve portion is provided on a diaphragm enclosing the secondary liquid chamber to open and close a port of the passage.

Abstract: Provided is a liquid sealing type vibration control device capable of sufficiently reducing strange sounds which comprises a first attachment fitting (1), a second attachment fitting (2), a vibration-isolating base body (3), a diaphragm (9), a partition body (12), and an orifice (25), the partition body (12) including an elastic partition membrane (15) and a pair of lattice members (17, 18). The elastic partition membrane (15) is provided on its both faces with rib groups (50) in a projecting manner, the rib groups (50) each consist of plural first ribs (51) and plural second ribs (52) mingled mutually, the first ribs (51) are set in such a height dimension that their tops can be situated apart from the lattice members (17, 18), and the second ribs (52) are set in such a height dimension that their tops abut on the lattice members (17, 18) and in a smaller rib width than the first ribs (51).

Abstract: A fluid filled vibration damping device wherein a first and second mounting member are connected by a main rubber elastic body, a pressure receiving chamber partially formed by the rubber elastic body and an equilibrium chamber partially formed by a flexible film are formed on either side of a partition member supported by the second mounting member, an orifice passage is formed for permitting a fluid communication between the pressure receiving chamber and equilibrium chamber communicate both having a non-compressible fluid; and a movable rubber plate is housed in a housing space so that minute pressure fluctuations in the pressure receiving chamber can be absorbed by the equilibrium chamber by means of the movable rubber plate. The movable rubber plate includes at least partially a corrugated part expanding generally a form of a corrugated panel by means of continuous depressions and protrusions.

Abstract: A fluid-filled type vibration-damping device having an elastic rubber film partially defining a primary fluid chamber at one surface and partially defining a pressure action chamber. The pressure action chamber varies its pressure under control so that the elastic rubber film changes its elasticity to change damping characteristics of the device. To give sufficient recovery force for the elastic rubber film, the elastic rubber film includes a plurality of thick reinforcing ribs circumferentially spaced apart from one another and extending in a radial direction from an outside peripheral edge over a length not reaching a center so that areas situated between pairs of adjacent reinforcing ribs constitutes thin portions formed by a thin rubber elastic body, while the center portion of the elastic rubber film situated between distal ends constitutes a bowed center portion thinner than the reinforcing ribs and convex towards the pressure action chamber.

Abstract: A fluid filled vibration damping device including: a low-frequency orifice passage opening directly towards a pressure-receiving chamber and an equilibrium chamber at either axial end surface of a first orifice member; a rubber partition plate disposed between a bottom surface of a center concavity of the first orifice member and a bottom end surface of a second orifice member, to create a seal mechanism that grasps an outer perimeter edge and a center diameter section of the rubber partition plate with a fluid-tight seal therebetween. Semicircular sections of the rubber partition plate surrounded by the areas grasped by the seal mechanism constituting a first deformable membrane section and a second deformable membrane section that respectively allow prescribed amounts of elastic deformation.

Abstract: There is provided a hydraulic antivibration device and an assembly capable of obtaining a low dynamic spring characteristic upon input of relatively small amplitude vibrations and reducing sufficiently strange sounds. The low dynamic spring characteristic is obtainable by absorption of hydraulic pressure fluctuations between both liquid chambers due to reciprocating displacement of an elastic partition membrane. First and a second attachment fittings are constituted respectively as body frame side coupling means and as vibration generator or engine side coupling means, whereby part of a vibration transmitting path from partitioning means to the body frame can be formed by a vibration-isolating base.

Abstract: An improved and tight package vibration isolator assembly increases the strength of the mount structure without compromising the efficiency of the damping features. An exo-skeleton bracket design provides a rigid structural strength able to withstand extreme loads. The bracket also allows forces to bypass the fluid components of the damping assembly that are otherwise subject to potential passage of forces therethrough. The exo-skeleton bracket provides a stiff structure that substantially surrounds the damping assembly. Tuning of the assembly is also simplified through use of a travel limiter assembly, the cross-section of which may change in shape, or characteristics of a surrounding resilient sleeve selectively altered, to tune the damping characteristics of the damping assembly.

Abstract: A fluid-elastomeric damper assembly operable for damping relative motion between a first structure and a second structure including a housing structure grounded to the first structure and a plurality of elastomer seals coupled to the housing structure, the housing structure and the plurality of elastomer seals defining a fluid-elastomeric chamber operable for containing a fluid. The fluid-elastomeric damper assembly also including one or more piston structures disposed within the housing structure and the fluid-elastomeric chamber, the one or more piston structures grounded to the first structure and driven by the second structure, and the one or more piston structures each including a first fluid chamber and a second fluid chamber in communication via an orifice, the first substantially fluid-filled chamber and the second substantially fluid-filled chamber also in communication with the fluid-elastomeric chamber through a fluid backfiller.

Abstract: An apparatus for locking a sheet of metal to be shaped in a press, comprising at least one fluid-operated actuator for translational motion of a first sheet presser, adapted to support, in an initial operation step a sheet of metal to be shaped, arranged above a first lower die part, coupled to the base of the press. The first presser cooperates with a second presser, coupled to the second die part associated with the upper ram of the press, in locking a perimetric portion of the sheet of metal during shaping. The actuators are part of a circuit for regenerating and supplying the working fluid, provided with devices for the delayed return of the actuators, upon opening the press, for shaped sheet protection.

Abstract: The invention pertains to a handheld implement, in particular a portable chainsaw (100), with a handle housing part (12) that contains at least one carrying handle (10), and with at least one motor housing part (16) that carries a drive unit (14) and is connected to the handle housing part (12) by means of an antivibration system that consists of at least one vibration-reducing element (18). The invention proposes an antivibration system of this type, in which the above-mentioned problems are solved due to the fact that an exchange of the vibration-reducing elements can be eliminated, wherein the antivibration system is still able to fulfill the individual requirements of the operator and the machine. This is achieved due to the fact that the at least one vibration-reducing element (18) is realized such that it can be adjusted with the aid of a tool or without requiring a tool.

Abstract: A hydraulic antivibration device is provided that is capable of suppressing generation of strange sounds while ensuring a low dynamic spring characteristic upon inputting of relatively small amplitude vibration and a high damping characteristic upon inputting of relatively large amplitude vibration. To that end, upon inputting of relatively large amplitude vibration, displacement-regulating ribs of one of sandwiching members serve to regulate displacement of an elastic partition membrane pinched by the sandwiching members thus obtaining a high damping characteristic. The displacement-regulating ribs consist of three pieces extending radially and rectilinearly, so that the area of openings of the sandwiching members is made wide enough to ensure more a low dynamic spring characteristic. Displacement-regulating protrusions of the elastic partition membrane are disposed to correspond to the displacement-regulating ribs thereby ensuring to suppress the generation of strange sounds.

Abstract: A main liquid chamber and a secondary liquid chamber are formed on both sides of an engine side mounting member to interpose the engine side mounting member. A rubber is vulcanized and molded integrally with the engine side mounting member. A car body side mounting member is injection molded of resin material in a state where the rubber, a pipe for molding a communication hole and the caulk fittings for caulking and fixing a lid member for closing an opening portion leading to one of the main liquid chamber and the secondary liquid chamber and provided in the car body side mounting member are disposed within an injection mold.

Abstract: A damper includes a hollow outer elongated body formed of a cylindrical member; a hollow inner elongated body similarly formed of a cylindrical member; a viscous body disposed in a cylindrical gap between an inner surface of the elongated body and an outer surface of the elongated body in such a manner as to be in contact with the inner surface and the outer surface of these elongated bodies, respectively; rectangular attaching plate members which are respectively secured to a closed-side other end portion, in an axial direction, of the elongated body having one end portion on an open end side and to a closed-side one end portion of the elongated body, respectively; and a holding structure for holding the gap between the inner surface of the elongated body at the one end portion of the elongated body and the outer surface of the elongated body.

Abstract: A hydraulic mount provides passive rate dip performance through use of a secondary orifice track-mass resiliently constrained within a first orifice track for reciprocating movement within the first orifice track under conditions such as engine idle, and constrained against reciprocating motion within the first orifice track for conditions imposing large amplitude, low frequency loads on the mount.

Abstract: A fluid filled vibration damping device including: an elastic body elastically connecting a first and a second mounting member and partially defining a pressure receiving chamber filled with a non-compressible fluid; a flexible diaphragm partially defining an equilibrium chamber filled with the non-compressible fluid and connected to the pressure-receiving chamber via an orifice passage. The first mounting member includes an elastic-body-side central member bonded to the elastic body central portion, and a rubber-layer-side central member bonded to the flexible rubber layer central portion, both mutually superposed on and fastened together by a connecting bolt. A fitting recess and projection are formed at an interface between two members, and a mounting projection projecting outward on an opposite side from the interface. The connecting bolt is off-centered from a center of the two members by a give distance.

Abstract: A fluid-filled cylindrical vibration damping device comprising: an elastic body connecting an inner shaft member and an outer sleeve member; a non-compressible fluid-sealing region formed between the inner shaft member and the outer sleeve member; a stop rubber member disposed within the fluid-sealing region and projecting form one of the inner shaft member and the outer sleeve member toward an other of the inner shaft member and the outer sleeve member; and a rigid restricting member bonded to a projecting end portion of the stop rubber member. The stop rubber member extends to a front surface of the rigid restricting member so as to form an abutment rubber projecting from an outer peripheral portion of the front surface so that the projecting end portion of the stop rubber member is brought into abutting contact with the other of the inner shaft member and the outer sleeve member with the abutment rubber.

Abstract: A work chamber is filled with a hydraulic liquid and is disposed between the legs of the spring body of a hydraulic radial bearing. The work chamber is connected to a compensating chamber via a transfer channel. The desired absorption of disturbing noises in the region of 130 Hz is obtained with a special dimensioning of the cross-sectional area of the work chamber, the dynamic swell stiffness of the spring body and the length (L) and the total cross-sectional area (A2) of the transfer channel. The ratio of the effective cross-sectional area (A1) of the work chamber to the cross-sectional area (A2) of the channel lies preferably between 0.1 and 10 while the ratio of the length (L) of the transfer channel to the total cross-sectional area (A2) of the transfer channel is in the range of 0.1 to 4.0.

Abstract: A fluid filled engine mount including: a pressure-receiving chamber and an equilibrium chamber connected via an orifice passage tuned to a frequency band of engine idling vibrations; an orifice control member operable by means of negative pressure exerted from an external space so as to restrict flow of the fluid through the orifice passage when an absolute value of the exerted negative pressure is greater than a predetermined value; and a negative pressure conduit of direct connection type, adapted to always introduce negative pressure available from an air intake port of an internal combustion engine to the orifice control member.

Abstract: An anti-vibration device is provided, with which it is possible to fix securely a stirring plate and the like member to a mounting end piece of a first fitting even though made of a brittle metal, e.g. aluminum diecast and to enhance the durability of the fixing structure of the stirring plate and the like member to the first fitting. It comprises the first fitting, a second fitting, a vibration isolating base, a diaphragm, a partition body, an orifice, and a stirring plate, wherein the mounting end piece is inserted in a mounting hole of the stirring plate, thereby to receive one plate member of the stirring plate on a receiving surface portion of the mounting end piece, and a projecting portion of the mounding end piece is upset so that a peripheral wall thereof in longitudinal cross-section may be an arc profile and a marginal area of a projecting end surface on the peripheral wall side thereof may be spherical.

Abstract: A fluid-filled vibration-damping device including: a first mounting member; a second mounting member; an elastic body elastically connecting the first and second mounting members and defining a fluid-sealing area filled with a non-compressible fluid; and a gas-retaining hole open to the fluid-sealing area through an opening thereof, and capable of retaining a predetermined volume of gas therein with the opening thereof facing vertically upward within the non-compressible fluid. A method of manufacturing the fluid-filled vibration-damping device is also disclosed.

Abstract: A hydraulically damping bush bearing is presented, in which an inner rubber mount, which comprises an essentially cylindrical or nearly cylindrical inner part (1) with an axial through hole (2), an outer sleeve (3) surrounding the inner part (1) as well as an elastomeric damping member (4), which is arranged between the inner part (1) and the outer sleeve (3) and is connected to them by vulcanization, is surrounded at its axial ends by chambers (5, 5?) for receiving a fluid damping agent, wherein the chambers (5, 5?) are formed by a hydraulic area, which is arranged separately around the rubber mount and which comprises a rigid channel carrier (6) pushed over the outer sleeve (3) of the rubber mount with a channel (7) for the flow-conducting connection of the chambers (5, 5?), an outer bush (8) supported axially on the channel carrier, and means (9, 9?) arranged axially on both sides of the rubber mount for closing the bush bearing, wherein the means (9, 9?) consist in their radially outer area of an elastome

Abstract: A fluid-filled vibration-damping device including an elastic body elastically connecting a first and a second mounting member, a pressure-receiving chamber disposed inward of and partially defined by the elastic body, and a flexible rubber layer disposed outwardly of and cooperating with the elastic body to form an equilibrium chamber held in fluid communication with the pressure-receiving chamber through a first orifice passage. The first mounting member includes an elastic-body central member and a rubber-layer central member, which are fixed together at their abutting surfaces by a fixing mechanism, to constitute the first mounting member, and positioned relative to each other by an engagement of a fitting recess and projection formed on their abutting surfaces. A peripheral portion of an interface between the abutting surfaces of the elastic-body central member and said rubber-layer central member entirely faces the equilibrium chamber and/or the pressure-receiving chamber.

Abstract: In an anti-vibration device having a partition member dividing a fluid-sealed chamber into upside and downside, aimed at enhancing the anti-vibration performance by preventing unwanted leak of the fluid through through-holes of the partition member. To that end, the partition member is constructed of an elastic membrane partitioning the fluid-sealed chamber, and a pair of grids limiting displacements of the elastic membrane; and the elastic membrane is provided at its either surface with projecting streaks integral therewith, the projecting streaks surrounding through-holes, defined by the grids, over their whole peripheries and abutting on the grids, thereby regulating the flow of fluid among adjacent through-holes.

Abstract: A fluid-sealed anti-vibration device is provided, in which a cone-shaped mounting section provided with an elastic body section which generates membrane resonance, and a cylindrical bushing section provided with an end wall and an elastic partition wall which also generate membrane resonance are integrally provided. When the fluid is filled and sealed in the cone-shaped mounting section and the cylindrical bushing section, the characteristics where a fluid is sealed in only the cone-shaped mounting section and the characteristics where the fluid is sealed in only the cylindrical busing section are coupled. Furthermore, the dynamic spring peaks and the dynamic spring bottoms, which are generated one by one in both sections, cancel each other. As a result, it is possible to realize the low dynamic spring effect in a wider frequency range by lowering the dynamic spring peak.

Abstract: A powertrain mount comprises an orifice plate including two tracks, a control track and an isolation track. The control track is spirally formed within the orifice plate, which has an exit and entrance on either side of the plate. The control track provides damping to control damping from engine bounce; whereas, the isolation track controllably provides dynamic rate dip. The isolation track is formed between an alignment plate and rotatable track member, each having an exit and entrance, respectively. The rotatable track member and the alignment plate are sealingly engaged and affixed to a decoupler and an annular area disposed about the orifice plate of the powertrain mount. The exit of the alignment plate is adjacent the decoupler. The rotatable track member forms a cavity with the molded body of the powertrain mount, with the entrance exposed to fluid within the cavity for controlling and minimizing vibrations within the powertrain.

Abstract: A powertrain mount comprises an orifice plate including two tracks, a control track and an isolation track. The control track is spirally formed within the orifice plate, which has an exit and entrance on either side of the plate. The control track provides damping to control damping from engine bounce; whereas, the isolation track controllably provides dynamic rate dip. The isolation track is formed between an alignment plate and rotatable track member, each having an exit and entrance, respectively. The rotatable track member and the alignment plate are sealingly engaged and affixed to a decoupler and an annular area disposed about the orifice plate of the powertrain mount. The exit of the alignment plate is adjacent the decoupler. The rotatable track member forms a cavity with the molded body of the powertrain mount, with the entrance exposed to fluid within the cavity for controlling and minimizing vibrations within the powertrain.

Abstract: A hydraulic vibration-damping support comprising two strength members interconnected by an elastomer body which defines a working chamber filled with liquid and separated from an easily-deformable compensation chamber by a rigid partition. The partition includes a decoupling flap which comprises a flexible membrane mounted to move with clearance between two intermediate gratings mounted on two rings via two elastomer bands.

Abstract: A fluid-elastomeric damper assembly operable for damping relative motion between a first structure and a second structure including a housing structure grounded to the first structure and a plurality of elastomer seals coupled to the housing structure, the housing structure and the plurality of elastomer seals defining a fluid-elastomeric chamber operable for containing a fluid. The fluid-elastomeric damper assembly also including one or more piston structures disposed within the housing structure and the fluid-elastomeric chamber, the one or more piston structures grounded to the first structure and driven by the second structure, and the one or more piston structures each including a first substantially fluid-filled chamber and a second substantially-fluid-filled chamber in communication via an orifice, the first substantially fluid-filled chamber and the second substantially fluid-filled chamber also in communication with the fluid-elastomeric chamber.

Abstract: A hydraulic mount provides passive rate dip performance through use of a secondary orifice track-mass resiliently constrained within a first orifice track for reciprocating movement within the first orifice track under conditions such as engine idle, and constrained against reciprocating motion within the first orifice track for conditions imposing large amplitude, low frequency loads on the mount.

Abstract: An antivibration sleeve comprising an inner strength member which extends longitudinally along a central axis, a rigid annular strength member surrounding the inner strength member, and an elastomer body which interconnects the two strength members. The strength members have respective wedge-shaped bearing zones placed in register with each other to compress the elastomer body when the antivibration sleeve is supporting a static axial load. The bearing zones of the annular strength member enabling passages to be formed between two hydraulic chambers defined by the elastomer body.

Abstract: A liquid-sealed mount capable of obtaining excellent damping performance is provided. For this purpose, the mount includes an elastic body (16), a stud (13) penetrating through the elastic body, a case (51), which is in a cylindrical shape with one end side being opened and with a bottom face on the other end side, and houses a viscous liquid (L) inside, and in which the viscous liquid is scaled by fitting the elastic body and the stud into the opening at the one end side, a damping member (14) attached to the stud in a state in which the damping member submerges in the viscous liquid; and a wall surface of a portion of the case, which submerges in the viscous liquid, is formed so that an inner diameter gradually decreases toward a lower position and an angle of inclination is different in an upper part from a lower part; and an outer circumferential side surface of the damping member opposes the inclined surface of the case.