Toyoda Gosei Co., Ltd.

Hitoshi Tajima

Takashi Maeno

Shigeki Takeo

A dilatant fluid-sealed vibration-insulating device includes a connection member to be connected to one member, a holder to be connected to another member, an insulator provided between the connection member and the holder, the insulator being made of a rubber-like elastic material, a main chamber and an auxiliary chamber serially provided below the insulator. A partition plate separates the main chamber and the auxiliary chamber from each other. An orifice is formed in the partition plate to communicate the main chamber and the auxiliary chamber with each other. An air chamber is provided into which the air is introduced. A diaphragm separates the air chamber from the auxiliary chamber, and a dilatant fluid is sealed in the main chamber and the auxiliary chamber. When vibrations having very low frequency of about 5Hz and a relatively large amplitude are inputted to the vibration-insulating device, the dilatant fluid exhibits a relatively small viscosity increase insufficient to dampen the vibrations. The fluid comprises dilatant fluid of which frequency range exhibiting the dilatancy thereof is shifted toward a frequency higher than the very low frequency of about 5Hz.

Dilatant fluid-sealed vibration-insulating device

A hydraulic damping device for preventing the transmission of vibrations of wide-ranging frequencies. The device includes a thick vibration damping rubber body which defines a main liquid chamber therewithin, first and second deformable rubber diaphragms which respectively define first and second auxiliary liquid chambers, first and second passageways for respectively connecting the auxiliary liquid chambers to the main liquid chamber, each passageway generating liquid resonance in a predetermined frequency vibration range different from each other, and a bottom plate for defining a pressure chamber with the first deformable rubber diaphragm which defines the first auxiliary liquid chamber connected with the main liquid chamber by the first passageway generating liquid resonance in a high-frequency vibration range. The pressure chamber is selectively brought into communication with the atmosphere or a negative pressure source. When idle vibrations are input, the pressure chamber communicates with the atmosphere to freely deform the first deformable rubber diaphragm, whereby a damping liquid flows mainly through the first passageway and accordingly the idle vibrations are effectively absorbed, whereas when shake vibrations are input, the pressure chamber communicates with the negative pressure source to restrict the free deformation of the first deformable rubber diaphragm, whereby the damping liquid flows mainly through the second passageway generating liquid resonance in a low-frequency vibration range, and accordingly shake vibrations are effectively restrained.

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Inazawa, Japan

Hitoshi Tajima