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US 7,802,777 B2Granted
Liquid-filled vibration isolator
AssigneeKurashiki Kako Co., Ltd.
InventorsMinoru Katayama, Naoki Miyamoto
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AssigneeKurashiki Kako Co., Ltd.
InventorsMinoru Katayama, Naoki Miyamoto
Estimating the term…
A liquid-filled vibration isolator has a first orifice channel providing communication between a pressure receiving chamber and a balancing chamber. One of the pressure receiving chamber and the balancing chamber is communicated via a second orifice channel with an intermediate liquid chamber. The second orifice channel has a shorter distance or a larger cross-sectional area than the first orifice channel. An elastic film member, such as a membrane, separates the intermediate liquid chamber and the other of the pressure receiving chamber and the balancing chamber from each other. A communicating hole of a predetermined size is formed in the elastic film member. An imaginary orifice channel combined from the two orifice channels provides a high damping effect on input vibration of relatively low frequency. As the vibration frequency increases, a gradual transition is made to the damping characteristic of the second orifice channel only.
A liquid-filled vibration isolator including a first fitting connected to a supported part, a second fitting connected to a supporting part and through a rubber elastic material to the first fitting, a main liquid chamber formed between both the first and second fittings to change the volume thereof with deformation of the rubber elastic material, and a first sub liquid chamber communicated via a first orifice channel with the main liquid chamber, the vibration isolator comprising:
Dependencies are inferred from the claim text.