GEARING

Drive shafts, clocks, and automated equipment are examples of mechanical devices that use gears to convey power and rotational motion between their constituent parts. In order to transmit torque, change speeds, and change direction, their teeth mesh with other components. Spur gears do not generate axial force when transferring linear motion. Heavy loads and fast speeds are transferred via helical gears. Long shafts with teeth that helical or spur gears ride on to transform rotational motion into linear motion are called gear racks. 1:1 momentum is relayed at right angles via mitre gears. Bevel gears are used to alter torque and speed by joining right-angle shafts.