Change plane formal name to steering gear, it is the most important part in turning to a department. Its action is: Increase change direction dish pass those who change the force of main transfer machinery and change to force to deliver direction.
Steering gear can be divided by configuration for a variety of types. At present commonly usedly brace of gear rack type, worm sells type and circular ball type.
1) gear rack steering gear: It is a kind of the commonnest steering gear. Its are basic the pinion that the structure is a pair of mutual clench the teeth and rack. When turning to an axis to drive pinion to rotate, rack does linear exercise. Sometimes, rely on rack to drive horizontal pull rod directly, can make turn to cycle to. So, this is a kind of the simplest steering gear. Its advantage is a structure simple, cost is low, turn to delicacy, volume is minor, can drive horizontal pull rod directly. Get applied extensively on the car.
2) worm brace sells type steering gear: It is it is driving link with worm, brace is sold for driven steering gear. Worm has echelon thread, the taper of finger shape points to annul go up in brace with bearing bearing, brace and turn to rocker arm shaft to make an organic whole.
When changing direction, through turning to dish of rotational worm, embed the taper in worm helix chamfer to point to annul at the same time rotation, circle at the same time turn to rocker arm shaft to do circular arc exercise, drive thereby brace and change direction hang down the arm swings, repass turns to main transfer machinery to make turn to round of deflexion.
This kind of steering gear is used at changing force to older carry cargo car normally.
3) steering gear of circular ball type: This kind of steering gear has two deputy to transmission composition, it is screw, nut to, another pair is fan of rack, tine or brace are sold.
Contain between screw and nut the steel ball that can roll circularly, slide kinetic friction turns into rolling friction, improved transmission efficiency thereby.
The advantage of this kind of steering gear is, operate light, wear away small, life is long. Defect is a structure complex, cost is high, turn to sensitivity to be inferior to gear rack type. Be replaced by gear rack type gradually accordingly. But the application that changes direction as motivation, steering gear of circular ball type gets be used extensively again in recent years.
