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. 19, 2013
Filed:
Aug. 10, 2007
Jun Ikeda, Tsuchiura, JP;
Takashi Yagyu, Ushiku, JP;
Tomohiko Yasuda, Kashiwa, JP;
Yutaka Watanabe, Kasumigaura, JP;
Jun Ikeda, Tsuchiura, JP;
Takashi Yagyu, Ushiku, JP;
Tomohiko Yasuda, Kashiwa, JP;
Yutaka Watanabe, Kasumigaura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A brake system in an electric drive dump truck. The electric drive dump truck has a generatordriven by an engineand traveling motorsL,R driven with electric power generated by the generator. Hydraulic brakesL,R,L,R are operated by brake pedal. An oil pressure sensordetects hydraulic fluid pressure produced in accordance with the amount of depression of the brake pedaland a control unitcontrols the traveling motorsL,R so as to operate them as generator-type retarders when the hydraulic fluid pressure P detected by the oil pressure sensoris not smaller than a predetermined value P