| 摘要 |
This invention provides an improved variable gear ratio steering gear for vehicles comprising a ball nut which has a rack on one side and moves in the axial direction of a worm, as the worm, connected to a steering shaft, rotates, and a sector gear meshed with said rack. According to this invention, the sector gear is formed by using a rack type gear cutter having blades symmetrically located at two places on the right and left sides of the center position of the sector gear when the vehicle is in its straight ahead position and provided with equal amount of lateral transposition, and the ball nut has the rack to be meshed with the sector gear having nearly the same tooth form as that of said rack type gear cutter.
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