What is variable ratio steering?
Variable-ratio steering is a system that uses different ratios on the rack in a rack and pinion steering system. At the center of the rack, the space between the teeth are smaller and the space becomes larger as the pinion moves down the rack.
How is a variable ratio obtained in a steering rack?
As the distance varies, the rotation angle of the output shaft also varies in relation to the input shaft, thus the steering ratio is changed. The ratio is determined by ECU according to speed as well as steering angle.
What is a variable rack?
VR-rack has become a common component of an automotive steering system. Variable ratio provides optimized steering performance by making the steering system less sensitive while driving straight and more sensitive while making turns.
Why is a variable pitch rack and pinion used?
Some cars use variable ratio steering. This rack and pinion steering system uses a different number of teeth per cm (tooth pitch) in the centre than at the ends. The result is the steering is more sensitive when it is turned towards lock than when it is close to its central position, making the car more maneuverable.
What is rack ratio?
Rack ratio is steering wheel rotation divided by wheel angle rotation. So deg/deg or rad/rad.
How does variable power steering work?
The variable-assist power steering works flawlessly by regulating the pressure of the steering gear. With this technology, the sensor tracks the speed and rotation of the car’s wheel and indicates the control unit. The unit regulates the pressure that reduces the flow of fluid into the steering gear system.
What are the signs of a bad rack and pinion?
Loose steering.
What is the difference between rack and pinion?
– Straight teeth have the tooth axis parallel to the axis of rotation. Straight teeth that run parallel to the axis of the gear. – Helical teeth gears provide continuous engagement along the tooth length and are often quieter and more efficient than straight tooth gears. – Roller pinion drives use bearing supported rollers that mesh with the t
What sound does a bad rack and pinion make?
What sound does a bad rack and pinion make? Noise. According to the New Jersey Division of Consumer Affairs, sounds such as thudding, clunking, or a persistent knocking can be warnings of a loose rack and pinion steering system.
How to replace a rack and pinion Assembly?
Remove the cotter pins and castle nuts from the outer tie rod ends and separate the tie rod ends from the steering knuckles using a suitable puller.