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WHAT ARE GEARS?
A CAR, GEAR TRANSMISSION SYSTEM
3D ANIMATION OF SPUR GEARS
COMPOUND GEARS A compound gear is a number of gears fixed together. Consequently, they rotate at the same speed. An example can be seen below.
Another example of a compound gear system is seen below. Gears C and B are fixed together and rotate in the same direction and at the same speed.
RACK AND PINION GEAR SYSTEMS A'rack and pinion' gears system looks quite unusual However, it is still composed of two gears. The pinion' is the normal round gear and the rack is straight or flat. The 'rack has teeth cut in it and they mesh with the teeth of the pinion gear.
A good example of a 'rack and pinion' gear system can be seen on trains that are designed to travel up steep inclines