Hydraulic damping device

Spring devices – Resilient shock or vibration absorber – Including energy absorbing means or feature

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Details

267 35, 267219, 267 6428, F16F 1300

Patent

active

052677265

ABSTRACT:
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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