What are the types of gear transmission?
Gear transmission is widely used in industry. It is a mechanical transmission that uses the teeth of two gears to mesh with each other to transmit power and motion. So what are the types of gear transmission?
1. Cylindrical gear transmission
For the transmission between parallel shafts, the general transmission ratio can reach 8 in single stage, 20 in maximum, 45 in two stages, 60 in maximum, 200 in three stages and 300 in maximum. The transmission power can reach 100000 kW, the rotational speed can reach 100000 rpm, and the peripheral speed can reach 300m / s. The single-stage efficiency is 0.96-0.99. Spur gear transmission is suitable for medium and low speed transmission. Helical gear transmission runs smoothly and is suitable for medium and high speed transmission. Herringbone gear transmission is suitable for transmission of high power and torque. There are three kinds of meshing forms of cylindrical gear transmission: external meshing gear transmission, which is meshed by two external gears, and the steering direction of the two wheels is opposite; the internal meshing gear transmission, which is meshed by an internal gear and a small external gear, has the same steering direction of the two wheels; the gear rack transmission can change the rotation of the gear wheel into the straight line movement of the rack, or vice versa.
2. Bevel gear transmission
Used for transmission between intersecting shafts. The single-stage transmission ratio can reach 6, the maximum is 8, and the transmission efficiency is generally 0.94-0.98. The transmission power of spur bevel gear transmission can reach 370 kW and the peripheral speed is 5 m / s. The helical bevel gear transmission runs smoothly and the bearing capacity of the gear is high, but it is difficult to manufacture and has less application. The transmission power can reach 3700 kW and the peripheral speed can reach 40 m / s.
3. Hypoid gear transmission
Used for transmission between staggered shafts. The single-stage transmission ratio can reach 10, the maximum is 100, the transmission power can reach 750 kW, the transmission efficiency is generally 0.9-0.98, and the peripheral speed can reach 30 m / s. Due to the axis offset, the cantilever installation of the pinion can be avoided. It is widely used in the transmission of automobiles and tractors.
4. Helical gear transmission
It is used for the transmission between interlacing, the transmission ratio can reach 5, the bearing capacity is low, the wear is serious, and the application is few.
5. Worm gear drive
The main form of staggered shaft transmission, the axis intersection angle is generally 90 degrees. Worm drive can obtain a large transmission ratio, usually single stage is 8-80, when used to transmit motion, it can reach 1500; transmission power can reach 4500 kW; worm speed can reach 30000 rpm; circumferential speed can reach 70m / s. The worm drive works stably, the transmission ratio is accurate, and it can be self-locking, but the transmission efficiency is lower than 0.5 when self-locking. The sliding between the tooth surfaces of worm drive is larger, the heat value is more, and the transmission efficiency is low, usually 0.45-0.97.
6. Circular arc gear transmission
Gear transmission with convex and concave circular arc as tooth profile. During the meshing process, the contact points move along the axis direction, and the continuous transmission is obtained by the longitudinal coincidence degree greater than 1. It is characterized by high contact strength and bearing capacity, easy formation of oil film, no undercutting phenomenon, uniform wear of tooth surface and good running in performance; however, it is sensitive to the error of center distance, tooth cutting depth and helix angle, so it requires high manufacturing and installation accuracy.
7. Cycloid gear transmission
Gear transmission with cycloid profile. The contact stress between tooth surfaces of this transmission is small, wear resistance is good, and there is no undercutting phenomenon. However, it requires high manufacturing accuracy and is very sensitive to center distance error. Only used in clocks and meters.
8. Planetary gear transmission
It is a gear transmission with a moving axis. There are many types of planetary gear transmission, and the performance of different types varies greatly. It is very important to select the type according to the working conditions. The common planetary transmission is composed of sun gear, planetary gear, internal gear and planetary carrier, planetary gear drive with small tooth difference, cycloid pin gear drive and harmonic drive. Planetary gear transmission is usually composed of parallel shaft gears, with the characteristics of small size and light weight. The input shaft and output shaft can be in the same line. Its application is more and more extensive.
We Luoyang Primary Precision Equipment Co.,Ltd can manufacture all types of gear wheels, welcome to contact us for inquires.
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