Mechanical devices used in motion transmission systems, especially in conjunction with sprockets or gears. They consist of a straight or curved bar with teeth evenly spaced along its length.
Racks are designed to precisely fit the teeth of a corresponding pinion or gear, thus forming a linear or rotary motion transmission mechanism. When the pinion or gear rotates, the teeth engage with the rack teeth, causing it to move in a straight line or rotate, depending on the system configuration.
Racks are widely used in a variety of applications, including machine tools, industrial equipment, transportation systems, automobiles, and many others. They offer an efficient way of converting rotary motion into linear motion and are especially useful when precise, controlled linear displacement is required.