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. 03, 2016
Filed:
Aug. 06, 2012
Takayuki Ogawa, Sagamihara, JP;
Jun Aoki, Sagamihara, JP;
Tsutomu Suzuki, Kawasaki, JP;
Masaru Uchida, Hachioji, JP;
Chie Yabuki, Yokohama, JP;
Takayuki Ogawa, Sagamihara, JP;
Jun Aoki, Sagamihara, JP;
Tsutomu Suzuki, Kawasaki, JP;
Masaru Uchida, Hachioji, JP;
Chie Yabuki, Yokohama, JP;
KYB Corporation, Tokyo, JP;
Abstract
A vibration damping device for railway vehicle includes an actuator and a damper circuit that causes the actuator to function as a damper. The actuator includes a cylinder coupled to a truck of a railway vehicle, a piston, a rod coupled to the piston and a body, a rod-side chamber and a piston-side chamber inside the cylinder, a first on-off valve for a first passage that communicates between a rod-side chamber and a piston-side chamber, a second on-off valve for a second passage that communicates between the piston-side chamber and a tank, and a pump that supplies a hydraulic fluid into the rod-side chamber. The hydraulic fluid has such kinematic viscosity-temperature characteristics that a kinematic viscosity of the hydraulic fluid ranges from 7 mm/s to 50 mm/s in a temperature range of from 20° C. to 60° C.