Rotary vane pump having multi-independent outputs due to stator surfaces of different contour

A vane-type double lobe hydraulic pump having a casing;

• a rotor within said casing and having a plurality of generally radially extending slots and a plurality of extensible vanes movably mounted at least one in each of said slots;
• means providing first and second inner inlet ports selectively communicating with first pumping chambers defined by said rotor slots beneath the vanes, first and second outer inlet ports selectively communicating with second pumping chambers defined by spaces between vanes, first and second inner outlet ports selectively communicating with said first pumping chambers, and first and second outer outlet ports selectively communicating with said second pumping chambers;
• a cam ring surrounding said rotor and having a pair of generally elliptical sections of different radius of curvature to provide a total pumping volume for said first and second pumping chambers when operatively associated with one of said elliptical sections which differs from the total pumping volume when operatively associated with the other of said elliptical sections;
• said pair of generally elliptical sections extending for different degrees of arc of the cam ring whereby the vanes tracking each section may accelerate at the same rate;
• a pair of casing outlet passages extending one from said first inner and outer outlet ports and the other from said second inner and outer outlet ports;
• a fluid utilization line connected to said pair of casing outlet passages, modulating valve means including a valve element associated one with each casing outlet passage ahead of said fluid utilization line, and control pressure means for sequencing the action of said modulating valve means to provide a variable volume pump action.

A vane-type double lobe hydraulic pump having a casing;

• a rotor within said casing and having a plurality of generally radially extending slots and a plurality of extensible vanes movably mounted at least one in each of said slots;
• means providing first and second inlet ports selectively communicating with pumping chambers defined by spaces between vanes, and first and second outlet ports selectively communicating with said pumping chambers;
• a cam ring surrounding said rotor and having a pair of generally elliptical sections of different radius of curvature to provide a total pumping volume for said pumping chambers when operatively associated with one of said elliptical sections which differs from the total pumping volume when operatively associated with the other of said elliptical sections;
• said pair of generally elliptical sections extending for different degrees of arc of the cam ring to provide a slope for the cam ring surface in each of said sections which is the same to have the same acceleration rate for vanes acting at each section;
• a pair of casing outlet passages extending one from said first outlet port and the other from said second outlet port;
• a fluid utilization line connected to said pair of casing outlet passages, modulating valve means including a valve element associated one with each casing outlet passage ahead of said fluid utilization line, and control pressure means for sequencing the action of said modulating valve means to provide a variable volume pump action.