Bridgestone Corporation

Bridgestone Tire Company Limited

Nissan Motor Company Limited

Takuya Dan

Michihiro Orikawa

Hiroshi Kojima

Tatsuro Ishiyama

Akio Fujita

Takaaki Uno

Toshiyuki Tabata

Takao Ushijima

Tomoyuki Kurata

Nobuaki Fujiwara

Isao Watanabe

A vibration isolating device is disclosed, which comprises two vibration-damping liquid chambers, and a partition member interposed between the two liquid chambers and provided with a restricted passage therein. In this device, the partition member comprises a pair of lapped plate materials, at least one of which is provided with a depression for defining the restricted passage in the lapping of the plate materials.

Vibration isolating device

A vibration insulating device for preventing vibration from being transmitted from an engine to a vehicle body in an automotive vehicle. The vibration insulating device is comprised of an elastic support member bonded between an inner cylinder connected to the engine and an outer cylinder connected to the vehicle body. The elastic support member is formed with a hollow which is located on an upper side of an imaginary horizontal plane containing the axis of the inner cylinder. The hollow functions to prevent a considerable tensile force from being applied to the elastic support member. Two small liquid chambers are formed between a part of the elastic support member and the inner periphery of the outer cylinder, and located on a lower side of the imaginary vertical plane. The two small liquid chambers communicate through an orifice passage. Additionally, one of the two small liquid chambers is adjacent to an air chamber through a flexible diaphragm.

Vibration insulating device

A vibration isolating apparatus having a support shaft connected to either one of a vibration generating portion and a vibration receiving portion, a base member connected to the other of the two, and a resilient member interposed between the base member and the support shaft and deformable in response to the movement of the support shaft in a direction substantially perpendicular to the axis thereof. A stopper is provided on the side of the support shaft which is remote from a vibration absorbing liquid chamber for limiting the movement of the support shaft. Accordingly, even when a load acts on the support shaft and the base member in a direction in which they are pulled away from each other, the support shaft can reliably be supported by way of the stopper.

Vibration isolating apparatus

Vibration isolating devices

An annular element is disposed within an outer tubular member of an insulator device in a manner to surround a recessed elastomeric body interposed between the outer tubular member and an inner tubular member. A channel formed in the outer periphery of the annular element is closed by the outer tubular member to define a passage which fluidly intercommunicates chambers defined by the recesses formed in the elastomeric body. The channel is sufficiently long and robust as to ensure the desired vibration damping and working life of the unit.

Vibration insulator

A vibration isolating apparatus is mounted on a vehicle body so as to absorb vibrations from a vibration source such as an engine. The apparatus includes a deformable liquid chamber which is divided into small liquid chambers by means of a partition plate. A bore which is formed in the partition plate is opened and closed by means of a valve, whereby the small liquid chambers are communicated with and shut off from each other. As a means for absorbing low-frequency vibrations, an orifice is provided which provides communication between the small liquid chambers. When a high-frequency vibration is generated, the valve is opened, and the bore of the partition plate causes liquid-mass resonance. A part of one of the small liquid chambers is constituted by a diaphragm through which a valve-driving force is transmitted.

A liquid-filled elastomeric bushing is disclosed, which comprises an inner sleeve, an outer sleeve, an elastomeric member disposed between the inner and outer sleeves and provided at its axially middle portion with liquid chambers, intermediate rings interposed between the elastomeric member and the outer sleeve and bonded to both end portions of the elastomeric member, and a restricted passage establishing communication between liquid chambers.

Liquid-filled elastomeric bushings

A vibration isolating device is disclosed, which comprises two vibration-damping fluid chambers, and a partition member interposed between the two fluid chambers and provided with a restricted passage. In this device, an auxiliary vibration-damping unit is arranged in one of the two fluid chambers subjected to vibrations from vibration source.

A rubber vibration isolator is disclosed, which comprises a pair of upper and lower liquid chambers capable of changing volumes by elastic deformation of an annular rubber elastomer accompanied with longitudinal vibration, a restricted passage for communicating these chambers with each other, at least two liquid chambers formed in the outer periphery of the elastomer and capable of changing volumes accompanied with lateral vibration, and another restricted passage for communicating the latter chambers with each other.

Rubber vibration isolators

An elastomeric shock and vibration isolator having a ring shaped rubber member in which a space is formed or a ring shaped rubber member having within such an internal space a sealed gas chamber and two liquid chambers filled with liquid which are interconnected through an orifice has a tightening ring on the outer circumference of the ring shaped member. The tightening ring is adjustable to adjust the tightening force against the ring shaped rubber member. The characteristics of a thus constructed elastomeric shock and vibration isolator can be changed to correspond to the position and condition of utilization.

Growing community of inventors

Yokohama, Japan

Takuya Dan