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:
Nov. 08, 2011
Filed:
Sep. 25, 2008
Yoshitomo Azekatsu, Wako, JP;
Hajime Kajiwara, Wako, JP;
Yoshitomo Azekatsu, Wako, JP;
Hajime Kajiwara, Wako, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
In a magneto-rheological variable damper (), the piston () comprises an inner yoke (), an outer yoke () concentrically surrounding the inner yoke and held in position by pair of end plates () made of non-magnetic material and disposed on either axial end surfaces of the piston. The piston may be circumferentially surrounded by a piston cover () that may be made of non-magnetic material and serves a slide member that engages the inner circumferential surface of a cylinder (). Alternatively, the end plates may serve as the slide member. In either case, the durability of the damper can be improved by using a wear resistant material for the slide member. In particular, the outer yoke may be made of material such as Permendur which has a high saturation magnetic flux density but a poor mechanical property. Thereby, the range of the damping force can be expanded. The slide member may be made of non-magnetic material having a favorable wear resistance such as austenite stainless steel and aluminum alloy. It is also possible to apply a plating or other surface processing to the sliding surface of the slide member to improve the wear resistance thereof.