Depending on the shape of the gears and the type of toothing, gears can be classified as spur gears, bevel gears and worms or worm gears.
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The figure below shows a selection of different gear types as they are used in mechanical engineering. A rough classification can be made as follows:
The most common type of gears used in mechanical engineering are cylindrical gears; they can be produced very economically. In this type, the teeth are arranged on the circumference of a cylindrical disc (called pitch cylinder).
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Animation: Pitch cylindersCylindrical gears can only mesh with each other with their respective circumferences. For this reason, the rotary axes of the different gear shafts are always parallel to each other.
With cylindrical gears, the teeth are arranged on the circumference of a (pitch) cylinder! The gear axes always run parallel to each other.
Animation: Spur gear
Gears with a cylindrical pitch surface are called cylindrical gears.
Spur gears, helical gears, and double helical gears which are used on parallel shafts, and screw gears which are used on non-parallel and non-intersecting shafts are classified as cylindrical gears.
Spur Gears (Cylindrical Gears)
Spur Gears (Cylindrical Gears)