A gear rack is a straight, toothed bar that converts rotational motion from a mating pinion into linear motion, forming the backbone of rack and pinion drive systems. 3BG Supply stocks gear racks in a range of pitches and lengths to pair with our spur gears and pinions for positioning, lifting, and steering applications. Browse our full gear and gear rack line or contact our team to help spec a rack and pinion set.
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FAQs
What is a gear rack?
A gear rack is a flat bar with straight-cut gear teeth along its length, designed to mesh with a rotating pinion gear so that the pinion's rotational motion is converted into linear travel, or vice versa. Gear racks are commonly used in linear actuators, lift systems, and steering mechanisms.
What is a rack and pinion gear system?
A rack and pinion gear system pairs a toothed gear rack with a mating pinion gear so that rotating the pinion drives the rack (or an attached carriage) in a straight line. It is one of the simplest and most reliable ways to convert rotary motor power into linear motion.
How do rack and pinion gears work?
As the pinion gear rotates, its teeth mesh with the teeth on the gear rack, pushing the rack forward or pulling it back depending on the direction of rotation. The distance traveled per rotation depends on the pinion's pitch diameter and the number of teeth engaged.
What's the difference between a gear rack and a pinion gear?
A gear rack is the straight, stationary or sliding component with teeth cut along a flat bar, while the pinion is a small round gear, often a spur gear, that rotates and drives the rack. The two are always specified together since their tooth pitch must match exactly.
How do I adjust a rack and pinion steering gear?
Adjustment typically involves setting the mesh preload between the rack and pinion using a shim or adjuster screw so there is minimal backlash without binding the mechanism. This should be done gradually, checking for smooth travel across the full range before locking the adjustment in place.
What materials are gear racks made from?
Gear racks are commonly manufactured from steel or stainless steel for heavy industrial loads, with hardened or ground tooth surfaces for improved wear resistance. Lighter-duty applications may use aluminum or engineered plastics for reduced weight.
Industrial Gear Rack Manufacturers
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