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:
Jul. 21, 2015
Filed:
Apr. 19, 2012
Kota Imanishi, Komatsu, JP;
Hiroyuki Chikugo, Oyama, JP;
Shuuji Hori, Oyama, JP;
Mitsumasa Akashi, Oyama, JP;
Akira Hasebe, Oyama, JP;
Shuki Akushichi, Sagamihara, JP;
Nobumasa Takamatsu, Komatsu, JP;
Kota Imanishi, Komatsu, JP;
Hiroyuki Chikugo, Oyama, JP;
Shuuji Hori, Oyama, JP;
Mitsumasa Akashi, Oyama, JP;
Akira Hasebe, Oyama, JP;
Shuki Akushichi, Sagamihara, JP;
Nobumasa Takamatsu, Komatsu, JP;
KOMATSU LTD., Tokyo, JP;
Abstract
A steering device for a wheel loader includes a rotatable handle, a tiltable lever, a steering cylinder, a steering valve, a pump, a handle control valve, a lever control valve, and a handle prioritization valve. The steering valve controls a supply direction of operating fluid to the steering cylinder with pilot hydraulic pressure. The pump supplies operating fluid to the steering cylinder via the steering valve. The handle and lever control valves supply pilot hydraulic pressure to control the supply direction to the steering valve according to handle rotation and lever tilt, respectively. The handle prioritization valve shuts off the pilot hydraulic pressure supplied from the lever control valve to the steering valve according to a differential pressure or an absolute pressure in a hydraulic circuit produced due to operating fluid flowing through the handle control valve when the handle is operated.