VARIABLE RATIO STEERING APPARATUS
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United States of America Patent
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N/A
Issued Date -
Jun 4, 2009
app pub date -
Nov 18, 2008
filing date -
Nov 30, 2007
priority date (Note) -
Abandoned
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Abstract
A variable ratio steering apparatus including an input shaft, an output shaft, a rotation speed increasing/reducing mechanism, a motor and a drive shaft that is driven by the motor. The rotation speed increasing/reducing mechanism includes an input gear with first internal teeth, an output gear with second internal teeth, a first planetary gear with first external teeth, a second planetary gear with second external teeth, a cylindrical member connecting the first and second planetary gears, and a rotary cam that is rotatively driven by the motor through the drive shaft to thereby turn the first and second planetary gears about a common rotation center of the input and output gears, so that a first meshing portion between the first external teeth and the first internal teeth and the second meshing portion between the second external teeth and the second internal teeth are allowed to displace in the circumferential direction.
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