Patent ID: 9683564
Date: 2017-06-20
CPC Classifications: F01C,F04C

Claim:
1. An internal gear pump comprising: a casing comprising an inlet, an outlet, an open outboard end and an inboard end through which a rotor shaft passes, the open outboard end enclosed by a head, the head and casing defining a pump chamber, the rotor shaft connected to a rotor disposed in the pump chamber, the head including an inner surface that faces the pump chamber, the inner surface connected to a boss that extends into the pump chamber, the boss comprising an idler support connected to a crescent support, the idler support rotatably connected to an idler, the crescent support partially covered by and connected to a crescent that extends away from the head and that is disposed below the idler, the crescent support further comprising a liquid directing step that extends from the crescent and towards the inlet, the boss comprising a lower wall disposed below the crescent support and that extends from the crescent support downward to the casing, the boss, inner surface of the head and casing defining a rotor feed slot between the liquid directing step and the casing and extending from the lower wall towards the inlet for providing communication between the inlet and the rotor.