Transmission ratio variable device and steering gear

Details Transmission ratio variable device and steering gear Transmission ratio variable device and steering gear

2006-11-24

2010-10-26

Le, David D (Department: 3655)

Machine element or mechanism

Gearing

C475S150000

Reexamination Certificate

active

07819041

ABSTRACT:
A variable transmission ratio apparatus for effectively preventing ratcheting between a flexible spline and a circular spline caused by a steering operation performing in a locked state. A variable transmission ratio apparatus includes a strain wave gear mechanism for adding rotation resulting from motor drive to rotation from an input shaft resulting from a steering operation and transmitting the added rotation to an output shaft, a housing accommodating the strain wave gear mechanism and the motor and fixed to a non-rotating portion, and a lock device for locking the housing and a motor shaft in a manner prohibiting relative rotation therebetween. Among the circular splines forming the strain wave gear mechanism, the number of teeth of the circular spline connected to the output shaft is greater than the number of teeth of the circular spline connected to the input shaft.

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