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:
Mar. 24, 2009
Filed:
Dec. 27, 2002
Yukihiro Tatsuno, Tsukuba, JP;
Kazuhiro Ichimura, Niihari-gun, JP;
Hidetoshi Satake, Ishioka, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
The present invention includes a hydraulic pump (), a variable displacement hydraulic motor () for traveling driven by pressure oil from the hydraulic pump (), a motor displacement control means () for adjusting a displacement of the hydraulic motor () in correspondence to a drive pressure at the hydraulic motor (), an operating member () through which a forward travel command and a backward travel command for the vehicle are issued, a control means () to be driven in response to an operation of the operating member (), for controlling a flow of pressure oil from the hydraulic pump () to the hydraulic motor (), a reverse operation detection means (A,B) for detecting a reverse operation of the operating member () performed to a reverse side opposite from a direction along which the vehicle is advancing, and a cavitation preventing means (A,B) engaged in operation so as to prevent occurrence of cavitation at the hydraulic motor () when the reverse operation at the operating member () is detected by the reverse operation detection means (A,B).