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:
May. 29, 1990
Filed:
Feb. 27, 1989
Shinichi Matsui, Yokosuka, JP;
Nissan Motor Co., Ltd., , JP;
Abstract
In order to attenuate low and intermediate frequency vibration ranges a mounting device is provided with two electronically controlled variable orifices. During low frequency vibrational ranges one is left either de-energized or partially energized to permit either free or limited communication between a main working chamber and a first auxiliary or expansion chamber, while the other is fully energized to close communication between the main chamber and a second auxiliary chamber. When the higher vibrational range is entered the first orifice is conditioned to cut off communication with the first auxiliary chamber and while the second is de-energized. The passage structure in the second orifice unit is designed to induce the fluid therein to undergo resonance when the higher vibration frequency is applied thereto.