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:
Feb. 07, 2023
Filed:
Sep. 24, 2019
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Tetsuji Tanaka, Abiko, JP;
Koji Hyodo, Kasumigaura, JP;
Yasunori Miyamoto, Tsuchiura, JP;
Isamu Aoki, Tsukuba, JP;
HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo, JP;
Abstract
Provided is a working vehicle capable of increasing lifting operation speed of a working device without increasing cost, even when provided with a circuit configuration that prioritizes a steering operation over a working device operation. A wheel loadercomprises a priority valveconfigured to allow hydraulic oil discharged from a hydraulic pumpto flow into a steering drive circuitpreferentially over a working device drive circuit, and further comprises: an electric steering lever; a pair of solenoid control valvesA,B configured to control a steering directional control valve; and a controller. The controlleris configured to control the pair of solenoid control valvesA,B so as to limit operation speed of a steeringwhen determining that an engineis in a low idle state and a lift armis performing a lifting operation.