Tokai Rubber Industries, Ltd.

Yoshiki Funahashi

Atsushi Muramatsu

Akiyoshi Ide

Masayuki Hibi

Katsuhiro Goto

Rentaro Kato

Ryouji Kanda

Yutaka Ishioka

Tetsu Matsui

Keiichi Ishiba

Nobuo Matsumoto

Keita Shiraki

Muramatsu

A fluid-filled elastic mount including an elastic body elastically connecting a first and a second support, and partially defining a fluid chamber filled with a non-compressible fluid. The elastic mount includes an oscillating plate which partially defines the fluid chamber and which is displaceable to change a pressure of the fluid in the fluid chamber, and a permanent magnet disposed on one of opposite sides of the oscillating plate remote from the fluid chamber. A first and a second yoke member are connected to opposite magnetic pole faces of the magnet by a plastic material, and cooperate with the magnet to define a closed magnetic circuit. The yoke members define therebetween an annular gap in the magnetic circuit, in which a magnetic fluid and an annular moving coil are received. The magnetic fluid includes magnetic particles dispersed in a liquid medium. The coil is fixed to the oscillating plate, to oscillate the oscillating plate upon energization of the coil.

Elastic mount having fluid chamber partially defined by oscillating

A fluid-filled elastic mount wherein an elastic body elastically connecting a first and a second support partially defines a fluid chamber filled with a non-compressible fluid. The elastic mount includes an oscillating plate which partially defines the fluid chamber and which is displaceable to change a pressure of the fluid in the fluid chamber, and a permanent magnet disposed on one of opposite sides of the oscillating plate remote from the fluid chamber. A first and a second yoke member are connected to opposite magnetic pole faces of the magnet and cooperate with the magnet to define a closed magnetic circuit. The yoke members define therebetween an annular gap in the magnetic circuit, in which an annular moving coil is received. The coil is fixed to the oscillating plate, to oscillate the oscillating plate upon energization of the coil. Also disclosed is a method of manufacturing the elastic mount, in which a blank for the magnet is magnetized together with the yoke members after the blank and yoke members are assembled into a unit.

A fluid-filled elastic mount wherein an elastic body elastically connecting a first and a second support partially defines a fluid chamber filled with a non-compressible fluid. The elastic mount includes an oscillating plate which partially defines the fluid chamber and which is supported by the second support such that the oscillating plate is displaceable relative to the second support, and an actuator for oscillating the oscillating plate to thereby change a pressure of the fluid in the fluid chamber. The elastic mount further includes an elastic support member for flexibly connecting the oscillating plate to the second support such that the oscillating plate is movable toward and away from the fluid chamber. This elastic support member is formed of an elastic material which substantially permits shearing deformation of the elastic support member and inhibits its compressive and tensile deformation.

Elastic mount having fluid chamber partially defined by elastically

A fluid-filled elastic mount including an elastic body for elastically connecting a first and a second support member, a partition structure cooperating the elastic body and a flexible diaphragm to partially define a pressure-receiving chamber and a variable-volume equilibrium chamber, respectively, which communicate with each other through an orifice, and a protective member fixed to the second support member for covering the diaphragm. The elastic mount has an elastic support member through which the protective member is elastically attached to the second support member and which cooperates with the protective member to provide a dynamic damper wherein the elastic support member is a spring member while said protective member is a mass member. This dynamic damper is effective to minimize resonating phenomenon of a mounting bracket used for fixing the second support member to one of two members that are flexibly connected by the elastic mount.

Fluid-filled elastic mount having dynamic damper for mounting bracket,

A fluid-filled elastic mount wherein an elastic body elastically connecting first and second supports partially defines a fluid chamber filled with a non-compressible fluid. The elastic mount includes an oscillating plate which partially defines the fluid chamber and which is displaceable to change a pressure of the fluid in the fluid chamber, and a permanent magnet disposed on one of opposite sides of the oscillating plate remote from the fluid chamber. The permanent magnet is made of a plastic magnetic material including a magnetic material and a plastic material as a binder for the magnetic material. First and second yoke members are held in contact with opposite magnetic pole faces of the magnet, and cooperate with the magnet to define a close magnetic circuit. The yoke members define therebetween an annular gap in the magnetic circuit, in which an annular moving coil is received. The coil is fixed to the oscillating plate, to oscillate the oscillating plate upon energization of the coil. Also disclosed is a method of manufacturing the elastic mount, in which a spacing between the yoke members is filled with the plastic magnetic material in a plasticized state, which is then solidified to provide the permanent magnet.

Elastic mount and method of manufacturing the elastic mount

A fluid-filled elastic mount including first and second support members and an elastic body interposed between these support members for elastically connection thereof. The elastic mount has a pressure-receiving chamber partially defined by the elastic body, first and second equilibrium chambers defined by first and second flexible diaphragms and communicating with the pressure-receiving chamber through first and second orifice passages, respectively, and a vacuum-receiving chamber which is separated by the second diaphragm from the second equilibrium chamber. In operation, the vacuum-receiving chamber is selectively subjected to a sub-atmospheric pressure or exposed to the atmosphere to control the elastic deformation of the second diaphragm. The elastic mount further has an auxiliary air chamber which cooperates with the vacuum-receiving chamber to accommodate a volumetric change of the second equilibrium chamber when the vacuum-receiving chamber is exposed to the atmosphere.

Fluid-filled elastic mount having vacuum-receiving chamber and auxiliary

A fluid-filled elastic mount including mutually spaced-apart first and second support members, and an elastic body for elastically connecting the first and second support members. The elastic mount has a plurality of fluid chambers filled with a non-compressible fluid and communicating with each other through an orifice passage or passages, and an air-tight operating chamber which is formed on one side of a flexible membrane remote from the corresponding fluid chamber. This flexible membrane consists of a fluid-impermeable first flexible layer which is corrosion-resistant to the non-compressible fluid, and a fluid-impermeable second flexible layer which is corrosion-resistant to gasoline. These flexible layers are superposed on each other such that the first flexible layer is exposed to the fluid chamber while the second flexible layer is exposed to the operating chamber. The elastic mount further includes a pressure control device for applying a vacuum pressure to the operating chamber so as to restrict elastic deformation of the flexible membrane.

Fluid-filled elastic mount having double-layered flexible membrane

A fluid-filled elastic mount is disclosed which includes a first and a second support member, an elastic body for interconnecting the support members and partially defining a pressure-receiving chamber, and a partition structure which cooperates with a first and a second flexible diaphragm to define a first and a second equilibrium chamber. The elastic mount has a first and a second orifice passage for fluid communication between the pressure-receiving chamber and the respective equilibrium chambers. The elastic mount further has an air chamber on one side of the second diaphragm remote from the second equilibrium chamber, and an operating chamber separated from the air chamber by a biasing elastic member. The operating chamber is subjected to a vacuum pressure as needed to move the second diaphragm away from the opening of the second orifice passage, which is normally closed by the second diaphragm due to a biasing force of the biasing elastic member. The elastic mount further includes a rigid planar member interposed between a top plate of the biasing elastic member and the second diaphragm. Between the rigid planar member and the top plate of the biasing elastic member is formed an air passage for permitting an air flow into a central portion of abutting faces thereof upon abutting contact therebetween.

Fluid-filled elastic mount having two orifice passages one of which is

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.

Fluid-filled elastic mount having two differently tuned orifices

A method of manufacturing a fluid-filled elastic mount which includes an electric body flexibly connecting an inner and an outer sleeve, means for defining a pressure-receiving chamber and an equilibrium chamber which are filled with a non-compressible fluid, and means for defining an orifice passage for fluid connection between the two chambers, the equilibrium chamber being defined partially by a rigid member and partially by a flexible diaphragm which permits volumetric changes of he equilibrium chamber. The present method includes the steps of: (a) preparing a mount body having the pressure-receiving and equilibrium chambers and orifice passage; (b) forming at least one injection hole through the rigid member partially defining the equilibrium chamber, such that the injection hole or hole is/are open on an outer surface of the elastic mount other than an outer circumferential surface of the outer sleeve; (c) injecting the non-compressible fluid through the injection hole(s), into the equilibrium and pressure-receiving chambers and the orifice passage; and (d) fluid-tightly closing the injection hole(s) upon completion of filling of the equilibrium and pressure-receiving chambers and orifice passage.

Method of manufacturing fluid-filled elastic mount having fluid

Fluid-filled mounting device

A fluid-filled elastic mount including an elastic body interposed between an inner and an outer sleeve, a pressure-receiving chamber disposed between the two sleeves, a first and a second equilibrium chambers partially defined by respective flexible diaphragms for absorbing pressure chambes in the two equilibrium chambers: a first and a second air chamber corresponding to the first and second equilibrium chambers, for permitting elastic deformation of the respective diaphragms; and a first and a second orifice passage for fluid communication between the pressure-receiving and the first and the second equilibrium chambers. The second orifice passage has a ratio of its cross sectional area to its circumferential length, which is higher than that of the first orifice passage. The elastic mount further includes a pressure control device connected to the second air chamber for changing a pressure in the second air chamber. This pressure control device includes a switch device which is operable between a first position for communication of the second air chamber with a first pressure and a second position for communication of the second air chamber with a second pressure higher than the first pressure, so that the fluid flows only through the first orifice passage when the switch device is placed in the first position, and through the second orifice passage when the switch device is placed in the second position.

Fluid-filled elastic mount having two differently tuned orifices and

A method of manufacturing a fluid-filled elastic mount including an elastic body connecting an inner and an outer sleeve, and having a pressure-receiving and an equilibrium chamber which are filled with a non-compressible fluid and communicate with each other through an orifice. The method includes preparing an inner unit having an intermediate sleeve connected to the inner sleeve by the elastic body, and a pocket formed in the elastic body such that the pocket is open through the intermediate sleeve and has an axial dimension defined by axially opposite side walls of the elastic body. The method further includes placing the inner unit within a mass of the fluid, and press-fitting the outer sleeve on the inner unit so as to provide the pressure-receiving chamber filled with the fluid, while applying an axial force to at least one of the side walls in the axial direction of the mount, to thereby cause elastic deformation of the side wall or walls so as to expand into the pocket. The axial force is removed from the side wall or walls to increase the volume of the pressure-receiving chamber and thereby reduce the volume of the equilibrium chamber.

Method of manufacturing fluid-filled elastic mount having

A fluid-filled cylindrical elastic mount for flexible coupling of two members, including an elastic body which is interposed between an inner and an outer sleeve for elastic connection therebetween and which has a pressure-receiving chamber filled with a non-compressible fluid and communicating with an equilibrium chamber through a restricted passage. The elastic body has a portion defining a void formed therethrough in an axial direction of the elastic mount. The void is positioned between the pressure-receiving chamber and one of the inner and outer sleeves, as viewed in a load-receiving direction in which the elastic body is compressed when the elastic mount is attached to the two members.

Fluid-filled cylindrical elastic mount having means for improved

A fluid-filled cylindrical elastic mount including an inner and an outer sleeve; an elastic body interposed between the inner and outer sleeves; a rigid sleeve disposed over at least an outer circumferential surface of opposite axial end portions of the elastic body; a pressure-receiving chamber provided between the inner and outer sleeves, filled with a non-compressible fluid, and receiving a vibrational load to be damped; an equilibrium chamber provided between the inner and outer sleeves, filled with the fluid, and at least partially defined by a flexible wall; a restricted passage for restricted fluid communication between the pressure-receiving and equilibrium chambers; a recess-defining member disposed between the inner and outer sleeves, for defining a radially outwardly opening recess, the outer sleeve covering the recess to provide a space of a predetermined volume; and an elastic sleeve for fluid-tight sealing between the outer and rigid sleeves. A portion of the elastic sleeve which is aligned with the space, is spaced apart from the outer sleeve so as to provide a flexible diaphragm in the space, the flexible diaphragm serves as the flexible wall, and the equilibrium chamber is provided in the space. The rigid sleeve and the recess-defining member may be constituted by a single generally cylindrical member.

Growing community of inventors

Iwakura, Japan

Yoshiki Funahashi