Fluid pump with flow control means

Claim 2

A fluid pump comprising a plurality of expansible fluid chambers; first and second inlet port means for selectively communicating fluid to said fluid chambers during expansion thereof; first and second outlet port means for selectively communicating fluid from said fluid chambers during contraction thereof; pump outlet port means in continuous fluid communication with said first outlet port means for directing fluid from said pump; first flow control valve means in fluid communication with said pump outlet port means for limiting the fluid flow from said pump at a predetermined level; and second flow valve means in fluid communication with said second outlet port means and being responsive to fluid flow from said second outlet port means to direct fluid flow therefrom to said pump outlet means when said fluid flow from said second outlet port means is below the level determined by said first flow control valve means, and to direct fluid flow from said second outlet port means to said first inlet port means when the fluid flow therefrom is above the predetermined level of said first flow control valve means.

Claim 3

A fluid pump comprising a plurality of expansible fluid chambers; first and second inlet port means for selectively communicating fluid to said fluid chambers during expansion thereof; first and second outlet port means in series fluid relationship with said first and second inlet port means respectively for selectively communicating fluid from said fluid chambers during contraction thereof; pump outlet port means in continuous fluid communication with said first outlet port means for directing fluid from said pump; first flow control valve means in fluid communication with said pump outlet port means for limiting the fluid flow from said pump at a predetermined level; and second flow valve means in fluid communication with said second outlet port means and being responsive to fluid flow from said second outlet port means to direct fluid flow therefrom to said pump outlet means in parallel fluid flow relationship with said first outlet port means when said fluid flow from said second outlet port means is below the level determined by said first flow control valve means, and to direct fluid flow from said second outlet port means in a series fluid relationship with said first inlet port means when the fluid flow therefrom is above the predetermined level of said first flow control valve means.

Claim 4

A fluid pump comprising a plurality of expansible fluid chambers; first and second inlet port means for selectively communicating fluid to said fluid chambers during expansion thereof; first and second outlet port means in series fluid relationship with said first and second inlet port means respectively for selectively communicating fluid from said fluid chambers during contraction thereof; pump outlet port means in continuous fluid communication with said first outlet port means for directing fluid from said pump; first flow control valve means in fluid communication with said pump outlet port means for limiting the fluid flow from said pump at a predetermined level; and second flow valve means in fluid communication with said second outlet port means and being responsive to fluid flow from said second outlet port means to direct fluid flow therefrom to said pump outlet means in parallel fluid flow relationship with said first outlet port means when said fluid flow from said second outlet port means is below the level determined by said first flow control valve means, and to direct fluid flow from said second outlet port means in a series fluid relationship with said first inlet port means when the fluid flow therefrom is above the predetermined level of said first flow control valve means.

Claim 5

A fluid vane pump comprising a pump rotor; a plurality of vanes slidably disposed in said rotor; dual lobe cam means surrounding said rotor and cooperating with said rotor and vanes to form a plurality of expansible chamber; drive means for rotating said rotor relative to said cam means for expanding and contracting said chambers twice during each revolution of said rotor; reservoir means for storing fluid; first and second inlet port means in parallel flow relationship for directing fluid to said chambers from said reservoir means; first and second outlet port means in series flow relationship with said first and second inlet port means respectively; pump outlet port means for directing fluid flow from said pump in continuous fluid communication with said first outlet port means; pump flow control means in fluid communication with said pump outlet port means for limiting the fluid flow from said fluid vane pump at a predetermined level; and bypass and flow control valve means including slidable valve means in fluid communication with said second outlet port means and being responsive to fluid flow from said second outlet port to direct the fluid flow therefrom to said pump outlet port means when the fluid flow from said second outlet port means is below the level determined by said pump flow control valve means, and to direct fluid flow therefrom to said first inlet port means when the fluid flow from said second outlet port means is at or above said predetermined level.

Claim 6

A fluid vane pump comprising a pump rotor; a plurality of vanes slidably disposed in said rotor; dual lobe cam means surrounding said rotor and cooperating with said rotor and vanes to form a plurality of expansible chamber; drive means for rotating said rotor relative to said cam means for expanding and contracting said chambers twice during each revolution of said rotor; reservoir means for storing fluid; first and second inlet port means in parallel flow relationship for directing fluid to said chambers from said reservoir means; first and second outlet port means in series flow relationship with said first and second inlet port means respectively; pump outlet port means for directing fluid flow from said pump in continuous fluid communication with said first outlet port means; pump flow control means in fluid communication with said pump outlet port means for limiting the fluid flow from said fluid vane pump at a predetermined level; and bypass and flow control valve means including slidable valve means in fluid communication with said second outlet port means and being responsive to fluid flow from said second outlet port to direct the fluid flow therefrom to said pump outlet port means when the fluid flow from said second outlet port means is below the level determined by said pump flow control valve means, and to direct fluid flow therefrom to said first inlet port means when the fluid flow from said second outlet port means is at or above said predetermined level.

Claim 7

A fluid vane pump comprising a pump rotor; a plurality of vanes slidably disposed in said rotor; dual lobe cam means surrounding said rotor and cooperating with said rotor and vanes to form a plurality of expansible chambers; drive means for rotating said rotor relative to said cam means for expanding and contracting said chambers twice during each revolution of said rotor; reservoir means for storing fluid; first and second inlet port means in parallel flow relationship for directing fluid to said chambers from said reservoir means; first and second outlet port means in series flow relationship with said first and second inlet port means respectively; pump outlet port means for directing fluid flow from said pump in continuous fluid communication with said first outlet port means; pump flow control valve means in fluid communication with said pump outlet port means for limiting the fluid flow from said fluid vane pump at a predetermined level; bypass and flow control valve means including slidable valve means in fluid communication with said second outlet port means, restriction means disposed between said second outlet port means and said slidable valve means, first passage means downstream of said restriction means in fluid communication with said pump outlet port means for directing fluid flow from said second outlet port means to said pump outlet port means when the fluid flow from said second outlet port means is below the predetermined level of said pump flow control valve means; second passage means downstream of said restriction means for directing Fluid flow from said second outlet port means to said first inlet port means when the fluid flow from said second outlet port means is above the predetermined level of said pump flow control valve means and pressure responsive means on said slidable valve means responsive to fluid flow from said second outlet port means and through said restriction means for moving said slidable valve means to provide fluid communication between said second outlet port means and said second passage means when the fluid flow from said second outlet port means is above the predetermined level.

Claim 8

A fluid vane pump comprising a pump rotor; a plurality of vanes slidably disposed in said rotor; dual lobe cam means surrounding said rotor and cooperating with said rotor and vanes to form a plurality of expansible chambers; drive means for rotating said rotor relative to said cam means for expanding and contracting said chambers twice during each revolution of said rotor; reservoir means for storing fluid; first and second inlet port means in parallel flow relationship for directing fluid to said chambers from said reservoir means; first and second outlet port means in series flow relationship with said first and second inlet port means respectively; pump outlet port means for directing fluid flow from said pump in continuous fluid communication with said first outlet port means; pump flow control valve means in fluid communication with said pump outlet port means for limiting the fluid flow from said fluid vane pump at a predetermined level; bypass and flow control valve means including slidable valve means in fluid communication with said second outlet port means, restriction means disposed between said second outlet port means and said slidable valve means, first passage means downstream of said restriction means in fluid communication with said pump outlet port means for directing fluid flow from said second outlet port means to said pump outlet port means when the fluid flow from said second outlet port means is below the predetermined level of said pump flow control valve means; second passage means downstream of said restriction means for directing Fluid flow from said second outlet port means to said first inlet port means when the fluid flow from said second outlet port means is above the predetermined level of said pump flow control valve means and pressure responsive means on said slidable valve means responsive to fluid flow from said second outlet port means and through said restriction means for moving said slidable valve means to provide fluid communication between said second outlet port means and said second passage means when the fluid flow from said second outlet port means is above the predetermined level.