Planetary Gear Assembly of a Starter Motor

摘要

A starter motor for an engine includes a housing and a planetary gear assembly. The housing defines an interior space. The planetary gear assembly is at least partially positioned in the interior space and includes (i) a sun gear having a first number of gear teeth equal to a pitch diameter of the sun gear, (ii) a ring gear having a second number of gear teeth equal to a pitch diameter of the ring gear, and (iii) no more than two planet gears each connected to a planetary gear carrier. Each planet gear of the no more than two planet gears has a third number of gear teeth equal to a pitch diameter of the no more than two planet gears.

主权项

1. A starter motor for an engine, comprising:
a housing defining an interior space; and a planetary gear assembly at least partially positioned in the interior space and including a sun gear defining an axis of rotation, a ring gear, a planetary gear carrier configured to rotate about the axis of rotation, and no more than two planet gears rotatably connected to the planetary gear carrier and configured to mesh with the sun gear and the ring gear, a gear ratio (“GR”) between the sun gear and the ring gear based on the following formulaGR=NRNS+1 wherein
“NR” is a number of gear teeth of the ring gear, and“NS” is a number of gear teeth of the sun gear.