End-thrust design for parallel-axis differential
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United States of America Patent
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Apr 12, 1994
Issued Date -
N/A
app pub date -
Dec 4, 1992
filing date -
Jul 25, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Frictional resistance, resulting from end thrust developed by planetary gearing, is appreciably increased in parallel-axis/torque-proportioning types of automotive differentials to improve torque bias characteristics. A pair of sun gears receive, respectively, the ends of coaxial drive axles, and the sun gears are interconnected by at least one planetary pair of combination gears positioned in the housing circumferentially around the sun gears. Each combination gear of the pair has a first engagement portion that is in mesh with a respective one of the sun gears, and each also has a second engagement portion that is in mesh with its paired combination gear. The first engagement portion of each combination gear is designed to develop end thrust on the combination gear to increase the frictional resistance between an end face of the gear and a bearing surface of the housing whenever the differential is subjected to a torque difference between its respective sun gears; and the gear's second engagement portion is specifically designed so that it develops either (a) no end thrust in a direction opposite to the direction of the end thrust developed by the first engagement portion or (b) end thrust in the same direction.
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