Toyota Jidosha Kabushiki Kaisha

Toyo Tire Rubber Co., Ltd.

Tokai Rubber Industries, Ltd.

Sumitomo Riko Company Limited

Toyo Tire Corporation

Katsuhiro Sakurai

Kentaro Yamamoto

Gen Isawa

Tatsunori Masuda

Nobuya Yoshida

Naoki Furumachi

Takahiro Ohguchi

Hiroyuki Ichikawa

Yuichi Ogawa

Norimitsu Furusawa

Katsushi Saito

Kengo Hase

Yoshiyuki Seno

Seiichi Hamate

Toshiyuki Kitano

Hiroki Mizukawa

A vibration damping device including: a first attachment member and a second attachment member disposed apart from each other; and a main rubber elastic body connecting the first attachment member and the second attachment member, the main rubber elastic body being of a frustoconical-like shape having an outer peripheral surface whose diameter gradually increases from the first attachment member toward the second attachment member, the main rubber elastic body including a recess opening onto a center portion thereof on a large-diameter side that is a second attachment member side, and the main rubber elastic body that constitutes a bottom part of the recess integrally including a vibration-damping protrusion protruding into the recess.

Vibration damping device

Disclosed is a liquid-sealed vibration isolator () provided with a main liquid chamber (), a portion of the chamber wall of which is formed from a vibration isolating base (), a subsidiary liquid chamber (), a portion of the chamber wall of which is formed from a first diaphragm (), and a first orifice flow path () which connects both liquid chambers, wherein a high-frequency second orifice flow path () which connects the main liquid chamber () and the subsidiary liquid chamber () is formed on a partitioning body (), and a second diaphragm () is provided on the opening (A) of the second orifice flow path () on the side of the main liquid chamber. The outer peripheral portion (A) of the second diaphragm is held by the partitioning body () in a liquid-tight manner, and the second diaphragm () abuts the peripheral edge portion of the opening (A) so as to block said opening with a flexible membrane section (B) which is provided on the inside of the second diaphragm (). Moreover, a through hole () is disposed on the flexible membrane section (B) at a position which does not overlap the opening (A).

Liquid-sealed vibration isolator

A valve member formed of an elastomeric membrane for opening and closing a second orifice flow passage is mounted on a partition element such that the valve member is arranged orthogonal to the flow direction of the second orifice flow passage. A valve portion for closing openings of the second orifice flow passage due to flexural deformation of a flexible membrane portion caused by liquid flow in the second orifice flow passage is arranged on the flexible membrane, and communication holes for bring the second orifice flow passage into communication are formed in the flexible membrane portion. A cylindrical buffer portion projecting from the flexible membrane portion for surrounding the openings when the flexible membrane portion is deformed by flexure is provided to the valve portion, and a projection height of the cylindrical buffer portion is set larger than a wall thickness thereof.

Liquid-sealed antivibration device

In a liquid-sealed antivibration devicewhich includes: a main liquid chamberA where a vibration-isolating baseforms a portion of a chamber wall thereof; a subsidiary liquid chamberB where a diaphragmforms a portion of a chamber wall thereof; a partition elementby which the main liquid chamberA and the subsidiary liquid chamberA are partitioned from each other; and an orifice flow passagewhich allows the main liquid chamberA and the subsidiary liquid chamberB to be communicated with each other, an elastic membraneis formed on the partition element, and the elastic membraneis formed of rubber composition containing butyl rubber or halogenated butyl rubber. Due to such a constitution, an abnormal sound generated by collision of the elastic membraneis reduced.

A partition element partitions a liquid-sealed chamber into a main liquid chamber and a first sub liquid chamber. A first orifice flow passage for connecting both liquid chambers is provided. A second diaphragm is formed in the partition element. The partition element includes a second sub liquid chamber partitioned from the main liquid chamber by the second diaphragm and a second orifice flow passage for connecting the first and second sub liquid chambers to each other. A valve portion brought into contact with a periphery around an opening of the second orifice flow passage is formed on a flexible membrane portion of the second diaphragm into a surrounding wall shape. A through hole is formed outside the valve portion, and a projection compressed by a counter wall is formed on a membrane surface of the flexible membrane portion on a main liquid chamber side.

In a liquid-sealed type vibration isolator having a first orifice flow channeland a second orifice flow channel, a valve memberformed of a rubber elastomeric membrane for opening and closing the second orifice flow channelis provided on a partitioning memberso as to be orthogonal to the direction of flow in the second orifice flow channel. The valve member is held at the outer peripheral portion thereof by a wall surface of a valve housing chamber, and includes inside the outer peripheral portion thereof a membrane portionB which is subjected to the flexural deformation by the liquid flow in the second orifice flow channel to close openingsC andD of the second orifice flow channel. Communicating holeswhich bring the second orifice flow channel into communication are provided at positions not overlapped with the opening of the membrane portionB. Accordingly, the switching of characteristics is enabled with an inexpensive structure.

Liquid-sealed type vibration isolator

A fluid-filled vibration damping device including: a pressure-receiving chamber and an equilibrium chamber disposed on either side of a partition plate, while being connected through a first orifice passage; a moveable film arranged to either a pressure-receiving chamber side or an equilibrium chamber side of the partition plate while being spaced away therefrom to define therebetween an intermediate chamber; a second orifice passage connecting the intermediate chamber and one of the pressure-receiving and the equilibrium chambers while being tuned to higher frequency than the first orifice passage; and a flow straightening plate arranged in opposition to the moveable film at least at one of the intermediate chamber side and an opposite side thereof, the flow straightening plate having a plurality of flow straightening apertures opening towards the moveable film and furnished with a flow limiting member.

Fluid-filled vibration damping device

To provide a liquid enclosing type vibration isolating apparatus capable of achieving two resonance characteristics by one orifice path, in a liquid enclosing type vibration isolating apparatus including a main liquid chamber a portion of a chamber wall of which is constituted by a vibration isolating base member, an auxiliary liquid chamber a portion of a chamber wall of which is constituted by a first diaphragm, and an orifice path for communicating the main liquid chamber and the auxiliary liquid chamber, an orifice member forming the orifice path is provided with a partition wall for partitioning the orifice path and the auxiliary liquid chamber, and a portion of the partition wall is constituted by a second diaphragm constituted by a flexible rubber-like elastic film facing the auxiliary liquid chamber.

Growing community of inventors

Aichi, Japan

Katsuhiro Sakurai