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:
Aug. 30, 2011
Filed:
Sep. 04, 2008
Yuuki Ishida, Nishinomiya, JP;
Hiroshi Shimada, Nara, JP;
Koji Nada, Sakai, JP;
Masaru Nakaji, Sakai, JP;
Hiroki Bessho, Sakai, JP;
Masatake Murakawa, Osaka, JP;
Yasunobu Nakatani, Sakai, JP;
Yuuki Ishida, Nishinomiya, JP;
Hiroshi Shimada, Nara, JP;
Koji Nada, Sakai, JP;
Masaru Nakaji, Sakai, JP;
Hiroki Bessho, Sakai, JP;
Masatake Murakawa, Osaka, JP;
Yasunobu Nakatani, Sakai, JP;
Kubota Corporation, Osaka, JP;
Abstract
A work vehicle includes a hydraulic stepless speed changing apparatus and a gear type speed changing apparatus operable to receive output from the hydraulic stepless speed changing apparatus to convert it into a plurality of stages of speed. A return oil passage connected to a high-pressure side circuit of the hydraulic stepless speed changing apparatus is connected to a hydraulic tank. The return oil passage incorporates an unload valve and a throttle valve, between which an operably coupling mechanism is provided. This operably coupling mechanism switches over the unload valve to an unload condition in response to an operational displacement of a brake operating member for operating a brake to its braking side.