Gears and racks exhibit their own motion characteristics during transmission: Gear transmission is used to transfer motion and power between any two shafts, with a circumferential speed up to 300m/s and power transmission capacity of up to 105KW. Gear diameters range from less than 1mm to over 150m, making it a widely used type of mechanical transmission in modern machinery.

Key Features of the Rack and Pinion:

Due to the linear rack tooth profile, each point on the tooth profile has the same pressure angle, which is equal to the tooth profile's inclination angle, referred to as the tooth form angle, with a standard value of 20°.

(2) Any straight line parallel to the top land has the same pitch and module.

(3) A line parallel to the pitch line and having the same thickness as the tooth width is known as the pitch line (midline), which serves as the baseline for calculating the dimensions of the rack.