Koyo

Fig. 1 Sideview Of Koyo Manual Steering Gear:

Fig. 2 Top View Of Koyo Manual Steering Gear:

In this steering gear, a bushing in the sector cover and a needle bearing in the housing support the sector shaft, Fig. 1. A continuous row of ball bearings are used to mate the threads of the ball nut to the threads of the worm shaft, Fig. 2. The ball bearings recirculate through ball return guides. The ball nut has gear teeth cut on one face which mesh with gear teeth on sector shaft. When the steering gear is turned, the worm shaft rotates causing the ball nut to rotate up or down the worm shaft. This movement of the ball nut causes the sector shaft to rotate and swing the Pitman arm.