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. 02, 1982
Filed:
Nov. 28, 1979
Taketo Aruga, Isehara, JP;
Koichi Morita, Isehara, JP;
Kabushiki Kaisha Komatsu Seisakusho, Tokyo, JP;
Abstract
A hydraulic circuit for a hydraulically driven vehicle comprising an engine, a variable displacement pump driven by the engine, a hydraulic motor connected with the variable displacement pump and driven thereby, the hydraulic motor having an output shaft connected thereto, a first fixed displacement pump driven by the engine, an inching brake valve connected with the first fixed displacement pump, a control valve connected with the output side of the inching brake valve for controlling the forward and reverse movement of the vehicle and speed thereof, the output side of which is connected with the variable displacement pump, a parking brake coupled with the output shaft of the hydraulic motor, the parking brake being normally applied by a spring and hydraulically released, a pilot operated first brake control valve connected with the parking brake, a manually operated pump connected with the first brake control valve and the inching brake valve, a pilot operated second brake control valve connected with the first brake control valve, a pilot port thereof being connected with the output side of the control valve, and a second fixed displacement pump driven by the engine and connected with the second brake control valve.