Gerotor-type oil pump

An oil pump comprising:

• a housing defining a face and an inner circumferential wall cooperating with the face to define a pump cavity having a high-pressure side and a low-pressure side, wherein the circumferential wall defines a recessed cutout extending arcuately along a portion of the circumferential wall in the low-pressure side;
• a gerotor pump set disposed in the cavity and including:
• an outer driven annulus defining internal lobes and an outer circumferential wall circumscribed by the inner circumferential wall, and
• an inner drive rotor eccentrically received within the outer annulus and defining external lobes cooperating with the internal lobes to define a plurality of fluid chambers;
• and
• a driveshaft extending through the face and coupled to the inner drive rotor, the driveshaft being configured to rotate the gerotor pump set within the cavity such that the outer annulus rotates relative to the inner circumferential wall, wherein the cutout forms an increased radial clearance between the inner and outer circumferential walls to reduce friction losses when the outer annulus rotates relative to the housing.

An oil pump comprising:

• a housing defining a pump cavity;
• a gerotor pump set disposed in the cavity and including an inner drive rotor and an outer driven annulus;
• and
• a cover including a front face disposed over the pump cavity, the front face defining an inlet port and an outlet port, wherein a portion of the outlet port is radially inboard of a root circle of the inner drive rotor.