Lesson 1/Learning Event 1
FIGURE 7. WORM AND NUT STEERING GEAR.
WORM AND BALL NUT STEERING GEAR
Another form of steering gear is called the worm and ball nut. In its
operation, this one really acts like a bolt and a nut. A nut is meshed with
the worm and screws up and down when the worm is turned back and forth.
These steering gears are also called the recirculating ball type. Both the
nut and the worm have roundshaped threads that steel balls fit in. The
balls act as a bearing to reduce the friction between the worm and nut.
Ball guides on one side of the nut allow the balls to recirculate as the
worm turns to screw the nut back and forth on the worm.
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