This particular system is named after the type of gears that are used. A little pinion gear, linked to the tyre, meshes with a long rack gear, linked at both ends to the tie rods and steering knuckles. When the driver turns the tyre, it pushes the rack left or correct, thereby turning the tires left or right.
A New Rack and Pinion In a car Restoration ProjectFor decades, the standard power-steering system has been hydraulically assisted. A hydraulic pump, the power-steering pump, uses engine power to generate hydraulic pressure, which is usually fed through the energy steering hoses to the rack. When steering can be used, hydraulic pressure improves the driver’s input power, Rack Pinion Steering making for simpler steering.
Rack-and-pinion steering is somewhat different from the steering boxes we looked at in last month’s issue. Perhaps the best way to describe it really is that it combines the steering package and tie rod, or centerlink, into one unit. In addition, it mounts up front, across the car, either behind the axle centerline or in front of it. That is why you’ll hear steering racks referred to as frontsteer and rear-steer racks. Attach a rear-steer unit before the axle centerline and the tires will go left when you steer correct, in exactly the same manner some steering boxes need to have their internals reversed to function in certain situations.
The steering wheel, through the steering column, is directly linked to the rack, though it could also employ universal joints, a rag joint, or a sliding joint. Inside the rack can be a pinion assembly that in turn movements a toothed piston, and this operates the steering equipment. The tie rods are connected to each end of the piston.
The benefit of rack-and-pinion steering is that it is more precise than a steering box. There are fewer moving parts, which makes the steering more responsive. Of course, much like boxes, there are the options of manual or power steering. It’s also extremely easy to mess up your frontend geometry when adding a steering rack to a preexisting frontend, leading to bumpsteer, though of program this will be removed if you opt for one of the many rack-and-pinion retrofit kits we’ll get into shortly.
The steering equipment transfers Rack and Pinionthe rotary movement of the steering wheel to a linear movement used to steer the front wheels. Two types of steering equipment are in use today, the typical gear container and the rack and pinion. The standard gear box runs on the worm gear that is rotated by the steering wheel to move the pitman shaft. The worm gear consists of spiral cut grooves that mesh with a sector gear at the top of the pitman shaft. The spiral action of the worm equipment causes the pitman shaft to move the steering linkage in a linear movement. Power steering is achieved by using hydraulic pressure to assist in the rotation of the worm gear.