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:
Jun. 08, 2021
Filed:
Mar. 05, 2019
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Shinichiro Tanaka, Akashi, JP;
Hiroyasu Kodera, Kobe, JP;
HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo, JP;
Abstract
The operability can be improved when the rotational speed of the engine is low and the working device actuator and the steering actuator are operated in a combined manner, while the configuration of prioritizing the operation of the steering actuator is maintained. A control device () included in a wheel loader () determines whether a working device () is in load lifting operation or not based on the pressure that is between a working device directional switching valve () and an orifice () and is detected by a pressure sensor (), and reduces the opening area of a steering control valve () when determining that the rotational speed of an engine () detected by a rotational speed sensor () is equal to or less than a predetermined threshold (Ns) and a working device is in the load lifting operation.