cheapbag214s
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 Posted: Tue 13:59, 20 Aug 2013 Post subject: How Car Steering Works |
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How Car Steering Works,[link widoczny dla zalogowanych]
Recirculating-ball Steering
Recirculating-ball steering is used on many trucks and SUVs today,[link widoczny dla zalogowanych]. The linkage that turns the wheels is slightly different than on a rack-and-pinion system,[link widoczny dla zalogowanych].
The recirculating-ball steering gear contains a worm gear. You can image the gear in two parts. The first part is a block of metal with a threaded hole in it. This block has gear teeth cut into the outside of it, which engage a gear that moves the pitman arm (see diagram above). The steering wheel connects to a threaded rod,[link widoczny dla zalogowanych], similar to a bolt,[link widoczny dla zalogowanych], that sticks into the hole in the block. When the steering wheel turns,[link widoczny dla zalogowanych], it turns the bolt. Instead of twisting further into the block the way a regular bolt would,[link widoczny dla zalogowanych], this bolt is held fixed so that when it spins,[link widoczny dla zalogowanych], it moves the block,[link widoczny dla zalogowanych], which moves the gear that turns the wheels.
Instead of the bolt directly engaging the threads in the block, all of the threads are filled with ball bearings that recirculate through the gear as it turns. The balls actually serve two purposes: First,[link widoczny dla zalogowanych], they reduce friction and wear in the gear; second,[link widoczny dla zalogowanych], they reduce slop in the gear. Slop would be felt when you change the direction of the steering wheel -- without the balls in the steering gear,[link widoczny dla zalogowanych], the teeth would come out of contact with each other for a moment,[link widoczny dla zalogowanych], making the steering wheel feel loose.
Power steering in a recirculating-ball system works similarly to a rack-and-pinion system,[link widoczny dla zalogowanych]. Assist is provided by supplying higher-pressure fluid to one side of the block,[link widoczny dla zalogowanych].
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