Rack and pinion rack and pinion china steering uses a gear-arranged to convert the circular motion of the tyre in to the linear motion required to turn the tires. It also offers a gear reduction, therefore turning the wheels is easier.
It works by enclosing the rack and pinion gear-arranged in a metal tube, with each end of the rack sticking out from the tube and linked to an axial rod. The pinion gear is mounted on the steering shaft to ensure that when the steering wheel is turned, the gear spins, moving the rack. The axial rod at each end of the rack links to the tie rod end, which is attached to the spindle.
Most cars need 3 to 4 complete turns of the steering wheel to proceed from lock to lock (from far right to far remaining). The steering ratio demonstrates how far to carefully turn the tyre for the wheels to turn a certain amount. A higher ratio means you need to turn the tyre more to carefully turn the wheels a specific quantity and lower ratios give the steering a quicker response.
Some cars use adjustable 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 
effect is the steering is more sensitive when it’s turned towards lock than when it is close to its central position, making the car more maneuverable.
There are two main types of rack and pinion steering systems:
End take off – the tie rods are attached to the finish of the steering rack via the inner axial rods.
Centre take off – bolts attach the tie rods to the centre of the steering rack.
As steering is vital for controlling your vehicle, it’s important to diagnose and restoration any steering problems as quickly as possible.
The chances are your vehicle has rack and pinion steering.
Thankfully, the basics aren’t hard to understand at all: it’s about turning rotational motion into linear. When you change the steering wheel, this turns a steering column, which rotates the attached steering shaft and a worm gear known as the pinion. This gear sits on the ‘rack’, a length of metal with some teeth cut into it. In order the pinion rotates, the rack movements either left or correct, based on your steering input.
Power steering adds a device to one aspect of the rack with a hydraulically actuated piston inside. A rotary valve directs hydraulic liquid to either the proper or left side of the piston – depending on the steering path – which applies strain on the piston and reducing the effort had a need to move the rack.
The rack-and-pinion gearset does two things:
It converts the rotational movement of the tyre into the linear motion needed to turn the wheels.
It provides a gear reduction, making it simpler to turn the wheels.
On many cars, it takes three to four complete revolutions of the tyre to help make the wheels turn from lock to lock (from far left to far right).