Introduction to the tooth profile of precision gear and the shape classification of gear

Precision gears can be classified according to tooth shape, gear structure shape, tooth line shape, tooth surface and manufacturing technology.

The tooth profile of precision gear mainly includes gear profile curve, pressure angle, tooth height and so on. Gradient gears are easy to manufacture, so modern involute gears account for the majority, while swing gears and arc gears are less used.

From the perspective of pressure angle, the bearing capacity of small pressure angle gear is small, and the bearing capacity of large pressure angle gear is high, but the bearing load is increased under the same transmission torque, so it is only used in special cases. And the tooth height of the gear has been standardized, and the standard tooth height is usually used. Modified gears have many advantages and have been widely used in various mechanical equipment.

Precision gears can also be divided into cylindrical gears, bevel gears, non-circular gears, racks and worm gears according to their shape; Through the shape of gear teeth, we can divide precision gears into spur gears, helical gears, herringbone gears and curved gears; Through the tooth surface, we can divide the precision gear into external gear and internal gear; Through manufacturing methods, we can divide precision gears into cast gears, cutting gears, rolling gears, sintered gears, etc.