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:
Jan. 13, 1981
Filed:
Jun. 26, 1979
Kabushiki Kaisha Komatsu Seisakusho, Tokyo, JP;
Abstract
A displacement control system for a variable displacement pump comprising a charge pump; a first and a second actuators connected in parallel to the variable displacement pump; a cut-off control valve connected to the charge pump, the cut-off control valve including a valve body having a first and a second pump ports, a pressure port and an outlet port formed therein, the first pump port being connected to the charge pump, the second pump port being connected to the variable displacement pump and the pressure port being connected to the first actuator, a sleeve mounted within the valve body, a first and a second pins slidably mounted within the sleeve, a spool slidably mounted within the sleeve, a cylindrical cap member fixedly secured to the valve body defining a spring chamber therein, and a spring disposed within the spring chamber for urging the spool toward connecting the first pump port with the outlet port; and a servo booster connected to the outlet port for controlling the displacement of the variable displacement pump.