Toyo Tire Rubber Co., Ltd.

Nissan Motor Company Limited

Shingo Hatakeyama

Masaaki Itoh

Yasuhiro Tanaka

Yukio Takashima

Masaaki Ito

Tomoyoshi Edo

Takeshi Hamanaka

Dai Ogasawara

Kentarou Yamamoto

A partitioning member partitioning two liquid chambers includes an orifice forming member, an elastic wall configured to close an inner peripheral surface thereof, and a pair of partitioning plates which hold the elastic wall from both sides in an axial direction X The pair of partitioning plates includes a holding portion configured to hold the elastic wall radially outward Ko of a coupling portion. The holding portion comprises a first holding portion on the radially outside and a second holding portion on the radially inside, and the first holding portion is provided with a high-compression holding portion having a compression ratio higher than that of the second holding portion. Accordingly, the abnormal sound is reduced while achieving both the damping performance in the low frequency range and the lowering of the dynamic spring constant in the high-frequency range without impairing the assembleability of the partitioning member.

Liquid-sealed type vibration isolator

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. When the elastic partition membrane is displaced, the displacement-regulating protrusions on the opposite side to the displacement direction intensify the stiffness of it locally, so that the elastic partition membrane is difficult to displace, leading to an effective reduction of strange sounds.

Liquid-sealed vibration control equipment and elastic partition film for use therein

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

Liquid sealing type vibration control device

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.

Growing community of inventors

Osaka, Japan

Shingo Hatakeyama