worm gear and worm wheel

The arrangement of gears seen above is named a worm and worm wheel. The worm, which in this example is definitely brown in colour, only has one tooth nonetheless it is similar to a screw thread. The worm wheel, coloured yellowish, is like a normal worm gear and worm wheel equipment wheel or spur equipment. The worm at all times drives the worm wheel round, it is never the contrary way circular as the system tends to lock and jam