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A pump gear includes a pump gear body having involute teeth that each have an involute surface that extends between a tooth tip and a tooth base. The involute surface includes at least reference points A-D, with reference point A near the base, reference point D near the tip, reference point B betwe

A pump gear includes a pump gear body having involute teeth that each have an involute surface that extends between a tooth tip and a tooth base. The involute surface includes at least reference points A-D, 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 have associated respective roll angles, εA-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.

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1. 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 i

1. 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, εA-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 εA is 11.96°-13.96°, the roll angle εB is 14.79°-16.79°, the roll angle εC is 23.29°-25.29°, and the roll angle εD is 26.12°-28.12°. 2. The pump gear as recited in claim 1, wherein the roll angle εA is 12.46°-13.46°, the roll angle εB is 15.29°-16.29°, the roll angle εC is 23.79°-24.79°, and the roll angle εD is 26.62°-27.62°. 3. The pump gear as recited in claim 1, wherein the roll angle εA is 12.96°, the roll angle εB is 15.79°, the roll angle εC is 24.29°, and the roll angle εD is 27.12. 4. The pump gear as recited in claim 1, wherein the pump gear body includes a wall that extends circumferentially around a central opening for receiving a pump shaft, the wall including a shoulder for locating the pump shaft and the opening is non-circular. 5. The pump gear as recited in claim 4, wherein the shoulder is axially aligned with the involute teeth. 6. The pump gear as recited in claim 4, wherein the pump gear body includes a circumferential flange extending axially and terminating at an axial face. 7. The pump gear as recited in claim 6, including an axial distance between the axial face and the shoulder that is 0.267-0.273 inches (0.678-0.693 centimeters). 8. The pump gear as recited in claim 7, wherein the pump gear body extends between the axial face and an opposing axial face and includes another axial distance of 0.168-0.178 inches (0.427-0.452 centimeters) from the opposing axial face to the shoulder. 9. The pump gear as recited in claim 1, wherein the pump gear body includes a hub portion having a central opening, a rim portion including the involute teeth, and spokes extending radially between and connecting the hub portion and the rim portion. 10. The pump gear as recited in claim 9, wherein the pump gear body includes circular openings between the spokes. 11. The pump gear as recited in claim 1, wherein the pump gear body includes a wall that extends circumferentially around a central opening for receiving a pump shaft, the wall including a double shoulder having two steps. 12. The pump gear as recited in claim 11, further comprising an undercut adjacent to the double shoulder. 13. The pump gear as recited in claim 1, wherein the involute teeth include an axial width of 0.320-0.330 inches (0.813-0.838 centimeters). 14. A pump assembly for a generator, comprising: a pump shaft that is rotatable about a central axis; anda pump gear mounted on the pump shaft, the pump gear having a gear body that includes 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 being 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, εA-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 and a reference base circle having a center origin at the center axis, and the roll angle εA is 11.96°-13.96°, the roll angle εB is 14.79°-16.79°, the roll angle εC is 23.29°-25.29°, and the roll angle εD is 26.12°-28.12°. 15. The pump assembly as recited in claim 14, wherein the pump gear is mounted on an end of the pump shaft with a fastener. 16. The pump assembly as recited in claim 14, wherein the gear body includes a wall that extends around a non-circular central opening for receiving the pump shaft, the wall including a shoulder for locating the pump shaft, and the pump shaft including a corresponding shoulder that abuts the shoulder of the gear body. 17. The pump assembly as recited in claim 14, further comprising a pump bearing rotatably supporting the pump shaft, a liner sleeve extending about the pump shaft adjacent to the pump bearing, a wear plate between the liner sleeve and the pump bearing, and at least one vane rotatable with the pump shaft. 18. A generator comprising: a stator;a rotor shaft that is rotatable;a rotor mounted on the rotor shaft to be driven within the stator and having a plurality of magnetic members circumferentially spaced around the rotor shaft;a gear train including a rotor gear mounted on the rotor shaft, an idler gear engaged with the rotor gear, and a pump gear operative to be driven by the rotor gear through the idler gear;a pump operatively coupled to the rotor shaft through the gear train, the pump including a pump shaft on which the pump gear is mounted, the pump gear including a 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 being 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, εA-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 and a reference base circle having a center origin at the center axis, and the roll angle εA is 11.96°-13.96°, the roll angle εB is 14.79°-16.79°, the roll angle εC is 23.29°-25.29°, and the roll angle εD is 26.12°-28.12°. 19. A method for processing a pump gear for a generator, comprising: forming 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, εA-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 establishing the roll angle εA to be 11.96°-13.96°, the roll angle εB to be 14.79°-16.79°, the roll angle εC to be 23.29°-25.29°, and the roll angle εD to be 26.12°-28.12°.