Gear pump, gear and method

Gear apparatus comprising:

• a gear having a plurality of teeth, each tooth having a shape identical to the shape of a third gear produced by first shaping a gear blank on a gear shaper, using as a cutter a first gear having teeth with the tips thereof forming at least 180.degree. of a cylinder to form a second gear, and then using the resulting second gear as a cutter on the gear shaper to produce the third gear.

A gear comprising:

• a gear body with an axis at the center and a plurality of teeth at the periphery, each tooth having a tip portion whose cross section is substantially 200.degree. of a 45.degree. ellipse, and with the gap between teeth being defined substantially by 200.degree. of a 35.degree. ellipse whose length is approximately 3 times the length of said 45.degree. ellipse, with the length of said 35.degree. ellipse extending radially and the length of said 45.degree. ellipse extending circumferentially.

A gear comprising:

• a gear body with an axis at the center, a plurality of teeth at the periphery, each of said teeth being symmetrical about a corresponding bisecting radial line, and the surface of the tooth on one side of the bisecting line lying on the following defined coordinate points, where the dimension X of a point equals the distance between the bisecting radial line and the point, and the dimension Y of the point equals the distance from the point to a line perpendicular to said radial line, and the units of length for the X and Y axis are the same:
• ______________________________________ Y X ______________________________________ .768 .031 .758 .038 .748 .045 .738 .052 .728 .058 .718 .064 .708 .070 .698 .075 .688 .080 .678 .084 .668 .088 .658 .091 .648 .093 .638 .095 .628 .097 .618 .097 .608 .098 ______________________________________

A gear comprising:

• a gear member having a plurality of teeth, each tooth having the shape illustrated in FIG. 5.

A gear train comprising:

• a sun gear with each tooth thereof of the same shape as a post tooth shape which is produced by shaping a gear blank on a gear shaper, using as a cutter a gear having tips forming at least 180.degree. of a cylinder to form a bullet gear, and using the bullet gear as a cutter on a gear shaper to produce the sun gear;
• and
• a planetary gear meshed with said sun gear, each tooth of said planetary gear having the same shape as a tooth of said bullet gear.