Classification of gear transmission

Cylindrical gear drive: it is used to transmit power and motion between parallel shafts. According to the relative relationship between gear teeth and gear axis, cylindrical gear transmission can be divided into straight gear transmission, helical gear transmission and herringbone gear transmission.


The transmission power and speed of cylindrical gear drive can range from less than 1/1000 watts to 100000 kilowatts, and the speed can be as low as 300m / s.


Bevel gear transmission: bevel gear transmission is composed of a pair of bevel gears between intersecting shafts, also known as bevel gear transmission. According to the shape of tooth line, bevel gear transmission can be divided into straight bevel gear transmission, helical bevel gear transmission and curved bevel gear transmission, in which straight teeth and curved teeth are widely used.


Non-circular gear transmission: it refers to the gear transmission in which the pitch surface of at least one gear is not a rotating surface.


Rack transmission: it has the transmission structure of gear and rack. The rack is divided into straight rack and helical rack, which is matched with straight gear and helical gear respectively. The tooth profile of rack is straight line rather than involute (plane for tooth surface), which is equivalent to infinite cylindrical gear with radius of dividing circle.


Worm drive: it is a kind of transmission of two-axis transmission of motion and power in space, the angle between the two axes can be any value, and it is commonly used as 90°. Worm drive consists of worm and worm gear, and general worm is active parts. Worm and thread have the same right-handed and left-handed, respectively called right-handed worm and left-handed worm. Worm with only one spiral line is called single head worm, that is, worm wheel turns one week, worm wheel turns one tooth, if there are two spiral lines on the worm, it is called double head worm, that is, worm wheel turns one week, worm wheel turns two teeth.