Features:

1. Instantaneous transmission ratio is constant. The instantaneous transmission ratio of non-circular gear transmission can be designed according to the changing law of demand.

2. The range of transmission ratio is large and can be used for decelerating or increasing speed.

3. Speed (circumferential speed of knuckle) and the range of power transfer are large, which can be used for high speed (v>40m/s), medium speed and low speed (v<25m/s); power is less than 1W to 105KW.

4. High transmission efficiency. For a pair of involute cylindrical gears with high precision, the efficiency can reach more than 99%.

5. Compact structure, suitable for short distance transmission.

6. The manufacturing cost is high. Some gears with special tooth shape or high precision need special or high precision machine tools, cutting tools and measuring instruments, so the manufacturing process is complicated and the cost is high.

7. Gears with low accuracy, noise, vibration and impact during transmission, pollute the environment.

8. No overload maintenance.

Type:

1. According to the relative position of the two axes and the direction of the gear teeth, it can be divided into the following types:

(1) spur gear transmission;

(2) Helical cylindrical gear transmission;

(3) herringbone gear transmission;

(4) bevel gear transmission;

(5) Cross-axle helical gear transmission.

2. According to the working premise of gear, it can be divided into:

(1) Open gear transmission, gear exposed to the outside, can not guarantee good lubrication.

(2) Semi-open gear transmission, gear immersed in oil pool, with shield, but not blocked.

(3) Closed gear transmission, gears, shafts and bearings are all installed in the sealed box. The lubrication condition is excellent, the ash sand is not easy to enter, and the installation is accurate.

Gear transmission has excellent working premise and is the most widely used gear transmission.

3. Gear transmission can be classified according to the relative position of its axis

Gear transmission can be divided into cylindrical gear transmission, bevel gear transmission, non-circular gear transmission, rack transmission and worm transmission according to the shape of the gear.

According to the profile curve of gear teeth, it can be divided into involute gear transmission, cycloid gear transmission and circular arc gear transmission. A transmission consisting of more than two gears is called a gear train. Gear transmission can be divided into ordinary gear transmission and planetary gear transmission according to whether there are axes in the gear train. The gear with axes in the gear train is called planetary gear. Gear transmission can be divided into closed type according to its working premise.

Gear transmission calculation, open and half-open transmission. It is called closed transmission that the transmission is sealed in rigid case and good lubrication is guaranteed. Closed transmission must be adopted more often, especially for gear transmission with higher speed. Open drive is exposed, can not guarantee good lubrication, only for low speed or not the primary transmission. The half-open drive is between the two.