Toyota Jidosha Kabushiki Kaisha

Toyo Tire Rubber Co., Ltd.

Toyo Tire Corporation

Gen Isawa

Kentaro Yamamoto

Katsuhiro Sakurai

Tatsunori Masuda

Takahiro Ohguchi

Norimitsu Furusawa

Katsushi Saito

Norifumi Yamada

Yoshiyuki Seno

Kengo Hase

The present invention provides a liquid-filled vibration isolator with improved durability. The liquid-filled vibration isolator includes a shaft unit, a first unit, an elastic body coupling the first unit and shaft unit, and a second unit mounted radially outside the first unit. The first unit includes a pair of annular elements, a pair of coupling elements coupling the annular elements, while the elastic body includes outer face portions bonded to outer surfaces of the coupling elements. The outer face portions include lips making contact with the second unit, and first segments making contact with the second unit on areas larger than the lips. The second unit restrains the annular elements along the entire circumferences, and compresses the lips and first segments in the radial direction.

Liquid-filled vibration isolator

A stopper includes: a mounting hole into which an inside member is inserted; and a plurality of surface ribs and a plurality of rear surface ribs. A plurality of surface ribs respectively protrude from the surface and linearly disposed. A plurality of the rear surface ribs, on a rear surface, respectively protrude from between the surface ribs and linearly disposed. In a predetermined region in a circumferential direction of the mounting hole, intervals between the surface ribs adjacent to each other and intervals between the rear surface ribs adjacent to each other are set to be constant throughout an entire length in an extending direction in which the surface ribs and the rear surface ribs extend.

Stopper and antivibration unit

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.

Growing community of inventors

Osaka, Japan

Gen Isawa