Core Definition and Operating Principle of a Rack
2026-03-20
A rack may be regarded as a segment of a cylindrical gear with an infinitely large diameter; as the pitch circle diameter of the gear approaches infinity, the gear effectively becomes a rack. The tooth profile of a rack is a straight line (or, in terms of the tooth surface, a plane), which differs markedly from the involute tooth form of a gear. The pressure angle of the rack tooth form is standardized at 20°, and its principal parameters include the module, tooth thickness, groove width, and tooth height.
In a transmission system, a rack is paired with a gear—also known as a pinion—to convert one form of motion into another. When the gear rotates actively, the meshing rack moves in a straight line; conversely, when the rack moves linearly under drive, it can in turn rotate the gear. This type of transmission boasts high efficiency, typically ranging from 98% to 99.5%. Compared with other linear-motion mechanisms, rack-and-pinion drives are particularly well suited for applications involving long strokes (e.g., exceeding 2 meters) and the need to transmit substantial axial forces, while also exhibiting a high tolerance for environmental dust.
Tags:
Previous Page
Next page
Previous page:
Next page:
Contact Us
Email:
Vera@bestcnrack.com
Mobile:
+8615131770135
Address:
South Side of Shihua Road, North Ring Economic Development Zone, Renqiu City, Cangzhou Prefecture, Hebei Province
Contact Information
Factory Address
South Side of Shihua Road, North Ring Economic Development Zone, Renqiu City, Cangzhou Prefecture, Hebei Province
Website Construction:China Enterprise Dynamics Baoding|Keywords