Compact volumetric pump

A method for reciprocating a pump of a transmission, the pump positioned within the transmission, comprising:

• rotating a lobe to move a piston that is arranged in a pressure hole, selectively compressing a spring for a compression stroke according to a position of the lobe relative to the piston;
• translating the piston from a top dead center toward a bottom dead center;
• increasing pressure between an inlet check valve and a pressure chamber causing the inlet check valve to close;
• increasing pressure between an outlet check valve and the pressure chamber causing a blowing force to and opening of the outlet check valve;
• forcing fluid out from the pressure chamber through the outlet check valve;
• where an inlet valve central axis of the inlet check valve is parallel to and offset from an outlet valve central axis of the outlet check valve;
• and
• where each the inlet check valve and the outlet check valve are in direct fluidic communication with the pressure hole.

A transmission of a vehicle, comprising:

• a self-priming pump, including:
• an eccentric lobe;
• a spring;
• a piston configured to receive the spring and interact with the eccentric lobe;
• a pump body including a cylindrical pressure hole that houses the piston and the spring;
• an inlet check valve positioned in an inlet port;
• and
• an outlet check valve positioned in an outlet port, where the inlet check valve and the outlet check valve do not comprise preload springs and are installed vertically in a normally closed position due to a force of gravity acting on internal balls of the inlet check valve and the outlet check valve;
• where an inlet valve central axis of the inlet check valve is parallel to and offset from an outlet valve central axis of the outlet check valve;
• and
• where each the inlet check valve and the outlet check valve are in direct fluidic communication with the pressure hole.