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How a Hydraulic Power Steering Rack Works

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Old 11-18-19, 03:57 PM
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speedkar9
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Default How a Hydraulic Power Steering Rack Works

Here's how a hydraulic power steering rack works:


Here is the steering rack removed from the car. It forms part of a hydraulic circuit that aids the movement of the steering rack when the wheel is turned.
How a Hydraulic Power Steering Rack Works-cyazmrm.jpg

Inside the pinion gear housing is the rotary valve:
How a Hydraulic Power Steering Rack Works-lafbgp2.jpg

This is the spool which collects the fluid into different channels and redirects it according to which side you are turning:
How a Hydraulic Power Steering Rack Works-l8t5as0.jpg

Inside the rotary valve housing are the holes for the hydraulic lines that correspond to different channels on the spool.
How a Hydraulic Power Steering Rack Works-f14yzgl.jpg

The rotary valve consists of a small torsion bar that twists a few degrees. This twisting action is what redirects fluids through the spool to either the right or left side of the rack piston:
How a Hydraulic Power Steering Rack Works-lybytop.jpg

Enjoy!


Last edited by speedkar9; 11-18-19 at 04:02 PM.
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Old 11-18-19, 04:06 PM
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Floyd91
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Great video!
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Old 11-18-19, 04:20 PM
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Toys4RJill
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Hopefully one day you do a comparison with an electric power steering system.
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Old 11-19-19, 04:40 PM
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speedkar9
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Originally Posted by LexsCTJill
Hopefully one day you do a comparison with an electric power steering system.
I already took apart two electric steering racks a few years ago:

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