Gears can be classified according to different classification standards, mainly including the following types of classification: according to the transmission mode of gear classification: parallel axis gear: two wheel axis parallel, common spur gear, helical gear, bevel gear and so on. Spur gear transmission efficiency is high, in the process of transmission noise and vibration is relatively large; Helical gear has better transmission performance and smoothness, but the manufacturing cost is higher. Bevel gears are mainly used for transmission with crossed axes, such as vehicle differentials. Orthogonal axis gear: two wheel axes intersect at right angles, common spiral bevel gear, oblique gear and so on. Helical bevel gear drive is smooth and less noise, which is widely used in high speed, heavy load and high precision. Oblique gear is passed through the oblique shaft, which is often used in the transmission system of construction machinery. According to the tooth shape of the gear classification: spur gear: the gear rack is a straight line parallel to the axis, and the tooth surface is parallel to the wheel hub. Spur gear is simple to manufacture, high transmission efficiency, but large noise and vibration. Helical gear: the rack line is at a certain Angle to the axis, and the tooth surface is beveled. Helical gear has better transmission performance and smoothness, but the manufacturing cost is higher. Arc gear: the rack and pinion is a rotation curve, and the tooth surface is curved. Arc gear is suitable for large construction machinery and other occasions, the transmission effect is good. Classification by the number of gear pairs: single-stage gear pairs: The transmission system includes only two gears. Multistage gear pair: a cascade transmission system consisting of three or more gears. Compound gear pair: A mixed pair composed of different kinds of gears, such as worm gear pair, etc. According to the transmission ratio of the gear classification: constant ratio gear transmission: the number of teeth of the gear is fixed, and the transmission ratio is not adjustable. Variable gear transmission: by adjusting the number of teeth of the gear or changing the coordination between the gears to achieve speed change. These classification methods are common induction and summary of gears, different types of gears have different characteristics and scope of application, you can choose the right type of gear according to actual needs.
