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:
Feb. 18, 2014
Filed:
Dec. 28, 2011
Yohei Katayama, Yokohama, JP;
Takao Nakadate, Yamato, JP;
Kenji Noda, Yamato, JP;
Mikio Yamashita, Yokohama, JP;
Fumiyuki Yamaoka, Sagamihara, JP;
Yohei Katayama, Yokohama, JP;
Takao Nakadate, Yamato, JP;
Kenji Noda, Yamato, JP;
Mikio Yamashita, Yokohama, JP;
Fumiyuki Yamaoka, Sagamihara, JP;
Hitachi Automotive Systems, Ltd., Ibaraki, JP;
Abstract
A frequency-dependent mechanism provided at the lower end of a piston rod includes a tubular housing displaceable in an inner tube, together with the piston rod as one unit, and further includes a free piston and O-rings. A shutter of a passage area varying mechanism is provided with an axially extending inner hole, orifices, and oil grooves. The opening area between oil holesC and the orificesB is changed according to the rotational position of the shutter. The opening area between oil holesD andE and the oil groovesC andD and the opening area between oil holesF andG and the oil groovesE andF are also variably adjusted according to the rotational position of the shutter.