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:
Sep. 12, 2023
Filed:
Mar. 15, 2021
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Yasunori Miyamoto, Tsuchiura, JP;
Tetsuji Tanaka, Abiko, JP;
HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo, JP;
Abstract
Provided is a work vehicle which can prevent an engine from stalling regardless of type of a system mounted on a vehicle body. In a wheel loaderequipped with a loading work deviceoperated by an electric operation lever, first and second directional control valvesinclude neutral positionsN,N for causing hydraulic oil discharged from a hydraulic pumpto return to a hydraulic oil tank, respectively, and in the case where a discharge pressure P of the hydraulic pumpis a main relief pressure Pr or more and an engine rotational speed N is less than a low idle rotational speed NL, a controllerA restricts the output of control signals to first and second solenoid control valvesso as to cause the first and second directional control valvesto be switched to the neutral positionsN,N, respectively.