Worm And Worm Wheel Steering Gear
A worm drive is a gear arrangement in which a worm (which is a gear in the form of a screw) meshes with a worm gear (which is similar in appearance to a spur gear). The two elements are also called the worm screw and worm wheel. The terminology is often confused by imprecise use of the term worm gear to refer to the worm, the worm gear, or the worm drive as a unit.
Like other gear arrangements, a worm drive can reduce rotational speed or transmit higher torque. A worm is an example of a screw, one of the six simple machines.
One of the major advantages of worm gear drive units are that they can transfer motion in 90 degrees.
A Gearbox Designed Using A Worm And Worm-Wheel Is Considerably Smaller Than One Made From Plain Spur Gears, And Has Its Drive Axes At 90° To Each Other. With A Single Start Worm, For Each 360° Turn Of The Worm, The Worm-Wheel Advances Only One Tooth Of The Gear Wheel. Therefore, Regardless Of The Worm's Size (Sensible Engineering Limits Notwithstanding), The Gear Ratio Is The "Size Of The Worm Wheel - To - 1". Given A Single Start Worm, A 20 Tooth Worm Wheel Reduces The Speed By The Ratio Of 20:1. With Spur Gears, A Gear Of 12 Teeth Must Match With A 240 Tooth Gear To Achieve The Same 20:1 Ratio. Therefore, If The Diametrical Pitch (DP) Of Each Gear Is The Same, Then, In Terms Of The Physical Size Of The 240 Tooth Gear To That Of The 20 Tooth Gear, The Worm Arrangement Is Considerably Smaller In Volume