The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 07, 1993
Filed:
Mar. 27, 1992
Shigeki Takeo, Inazawa, JP;
Hitoshi Tajima, Inazawa, JP;
Toyoda Gosei Co., Ltd., Nishikasugai, JP;
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.