Sumitomo Riko Company Limited

Toyota Jidosha Kabushiki Kaisha

Tokai Rubber Industries, Ltd.

Naoki Furumachi

Hiroyuki Ichikawa

Takayoshi Yasuda

Yuichi Ogawa

Katsuhiro Sakurai

Kentaro Mori

Nobuya Yoshida

Satoru Hibi

Yuji Matsubara

Yoshinori Watanabe

Keishi Hatanaka

Takeshi Kuniya

Hiroki Mizukawa

An antivibration device includes a bracket fixed to an antivibration connection target member. A positioning member attached to an attachment hole of the bracket includes a positioning protruding portion inserted into a positioning hole of the antivibration connection target member and positioning the bracket; and a cylindrical attachment portion protruding from the positioning protruding portion and inserted into the attachment hole. The attachment portion has a locking claw protruding toward the outer periphery. The positioning member is positioned with respect to the bracket by sandwiching a peripheral edge portion of the attachment hole between the positioning protruding portion and the locking claw. The peripheral edge portion of the attachment hole has a protrusion that protrudes in the penetrating direction of the attachment hole to adjust and set the thickness of the peripheral edge portion.

Antivibration device

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

A vibration-damping device including: a first mounting member configured to be mounted to one of components of a vibration transmission system; a second mounting member configured to be mounted to an other of the components of the vibration transmission system; a main rubber elastic body connecting the first mounting member and the second mounting member elastically to each other; a bracket attached to the second mounting member, the bracket having a mounting part configured to be mounted to the other of the components of the vibration transmission system; a tubular outer member secured press-fit to the second mounting member; a mass member disposed within the tubular outer member; and a support rubber fixed at an outer peripheral part of the mass member, the support rubber elastically connecting the tubular outer member and the mass member to constitute a dynamic damper.

Vibration-damping device

A vibration damping device including a main rubber elastic body elastically connecting first and second mounting members. An upper portion of the main rubber elastic body constitutes a small-diameter portion to which the first mounting member is bonded, while a lower portion thereof constitutes a large-diameter portion to which the second mounting member is bonded. The first mounting member includes an inner recess opening onto an outer circumferential surface thereof, and the small-diameter portion of the main rubber elastic body is bonded to the inner recess. The main rubber elastic body has an outside diameter dimension made larger at a portion bonded to the inner recess than an outside diameter dimension of the first mounting member at a lower side than the inner recess such that the small-diameter portion of the main rubber elastic body is thick-walled by being bonded to the inner recess.

A fluid-filled vibration damping device including: a first mounting member; a second mounting member; a main rubber elastic body elastically connecting the first and second mounting members; a pressure-receiving chamber whose wall is partially constituted by the main rubber elastic body; an equilibrium chamber whose wall is partially constituted by a flexible film, the pressure-receiving chamber and equilibrium chamber being filled with a non-compressible fluid; and an orifice passage which connects the pressure-receiving chamber and the equilibrium chamber to each other. A turbulence generating part is formed in a middle portion of the orifice passage in a length direction causing turbulence to be generated depending on a flow rate of a flowing fluid.

Fluid-filled vibration damping device

A fluid-filled vibration damping device including: first and second mounting members elastically connected by a main rubber elastic body; a tubular fitting member externally slipped around the second mounting member and drawn so as to be externally fitted thereto in a fluid-tight manner; a sealing rubber layer fixed to at least one of an outer peripheral face of the second mounting member and an inner peripheral face of the tubular fitting member so as to be compressed therebetween about an entire circumference; and at least one pressure-relieving lip protruding from the sealing rubber layer and extending toward openings of the second mounting member and the tubular fitting member so as to be pressed against one of the outer peripheral face of the second mounting member and the inner peripheral face of the tubular fitting member in a direction of protrusion.

Fluid-filled vibration damping device and method of manufacturing the same

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.

A fluid-filled type vibration damping device wherein a low-frequency orifice passage and at least one high-frequency orifice passage are formed in a partition member, which is supported by a second mounting member; a valve body is disposed at least at one opening of the high-frequency orifice passage and is provided with a spring member that in a nonloaded state positions the valve body away from the opening of the high-frequency orifice passage to hold the high-frequency orifice passage in an open state; and, at times of vibration input, the valve body is adapted to block the high-frequency orifice passage in opposition to a holding force of the spring member.

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Kasugai, Japan

Naoki Furumachi