초록 ▼

A hydraulically-actuated system includes a fixed displacement pump with a plurality of parallel disposed pistons that reciprocate in a pump housing that defines a high pressure area and a low pressure area. A control valve is attached to the pump housing and moveable between a first position in whic

A hydraulically-actuated system includes a fixed displacement pump with a plurality of parallel disposed pistons that reciprocate in a pump housing that defines a high pressure area and a low pressure area. A control valve is attached to the pump housing and moveable between a first position in which the pistons displace fluid in a first proportion between the high pressure area and the low pressure area, and a second position in which the pistons displace fluid in a second proportion between the high pressure area and the low pressure area. A high pressure common rail is connected to the high pressure area of the pump. At least one hydraulically-actuated device is connected to the high pressure rail. A source of low pressure fluid is connected to the low pressure area of the pump. An electronic control module is in communication with and capable of controlling the position of the control valve.

대표청구항 ▼

[ We claim:] [1.] A hydraulically actuated system comprising:a fixed displacement pump with a plurality of parallel disposed pistons that reciprocate in a pump housing which defines a high pressure area and a low pressure area;a control valve attached to said pump housing and being moveable between

[ We claim:] [1.] A hydraulically actuated system comprising:a fixed displacement pump with a plurality of parallel disposed pistons that reciprocate in a pump housing which defines a high pressure area and a low pressure area;a control valve attached to said pump housing and being moveable between a first position in which said pistons displace fluid in a first proportion between said high pressure area and said low pressure area, and a second position in which said pistons displace fluid in a second proportion between said high pressure area and said low pressure area;a high pressure rail connected to said high pressure area of said pump;at least one hydraulically actuated device connected to said high pressure rail;a source of low pressure fluid connected to said low pressure area of said pump;an electronic control module in communication with and capable of controlling a position of said control valve; anda spring operably positioned to bias said control valve toward a position at which said pistons displace a majority of said fluid into said low pressure area.