• Most
widely used steering gear at one time
•
Balls present in the gear greatly reduce friction
•
This increase the efficiency of the mechanism
It
consists of worm at the end of steering shaft:
•
A nut is mounted on the worm with two sets of balls in the grooves of the worm, in
between the nut and the worm
•
The balls reduce the friction during the movement of the nut on the worm
• The
nut has a number of teeth on the outside, which mesh with the teeth on a worm wheel
sector
•
Drop arm is mounted on the worm wheel sector, which steers the road wheels through the
link rod and the steering arms
• When
the steering wheel turned, the balls in the worm roll in the grooves and cause the
nut to travel along the length of the worm
• The balls, which are in two sets, are
recirculated through
• The
movement of the nut causes the wheel sector to turn at an angle and actuate the link
rod through
the drop arm, resulting in the desired steering of the wheels
Applications:
•
Tata vehicles
•
Dodge / Fargo
•
Standard 20 vehicles
•
Ashok Leyland Viking Trucks etc.,
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