Patent ID: 7179070

Claim:
A pump/motor apparatus comprising: a hollow housing having a cavity formed therein, at least one inlet port for fluid flow into said cavity and at least one outlet port for fluid out of said cavity; a first gear having a first shaft extending therefrom and disposed in said cavity, said first gear having a plurality of teeth formed on an exterior surface thereof; a second gear having a second shaft extending therefrom and disposed in said cavity, said second gear having a plurality of teeth formed on an exterior surface thereof meshing with said teeth of said first gear, a free end of said second shaft extending through said housing and said first gear being axially moveable along said second shaft to vary a displacement of said cavity; a rotatable first seal disposed in said cavity and engaging with a portion of said first gear; and a rotatable second seal disposed in said cavity and engaging with a portion of said second gear whereby when pressured liquid is supplied to said at least one inlet port, the pressured fluid rotates said first and second gears causing said second shaft to rotate for operation as a motor, and when said second shaft is rotated, said second gear rotates said first gear for operation as a pump causing fluid to flow from said at least one inlet port to said at least one outlet port and wherein said first gear, said first shaft and said second seal are free to move along axis of said second and first shafts in said cavity in response to internal pressure in said housing.