Patent ID: 8132480

Claim:
A pump gear for a generator, comprising: a pump gear body having a plurality of involute teeth circumferentially located about a center axis of rotation, each of the plurality of involute teeth including an involute surface that extends between a tooth tip and a tooth base, the involute surface including at least reference points A-D thereon with reference point A near the base, reference point D near the tip, reference point B between reference points A and D, and reference point C between reference points B and D, the reference points A-D having respective roll angles, ε A-D , between a corresponding first line that is perpendicular to the involute surface at the given reference point A-D and a second line that is tangent at a reference point that lies on a terminal end of the involute surface at the tooth base to a reference base circle having a center origin at the center axis, and the roll angle ε A is 11.96°-13.96°, the roll angle ε B is 14.79°-16.79°, the roll angle ε C is 23.29°-25.29°, and the roll angle ε D is 26.12°-28.12°.