gear drive

Gear transmission is the most widely used form of transmission in mechanical transmission. Its transmission is more accurate, efficient, compact, reliable, and long-lived. The current gear technology can achieve the indicators: circumferential speed v = 300m / s, speed n = 105r/min, transmission power P = 105KW, modulus m = 0.004 ~ 100mm, diameter d = 1mm ~ 152.3mm

Features:

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

2. Large range of transmission ratio can be used for deceleration or speed increase.

3, speed (circumference circle speed) and transmission power range, can be used for high-speed (v> 40m / s), medium and low speed (v <25m / s) drive; power from less than 1W to 105KW.

4, high transmission efficiency. A pair of high-precision involute cylindrical gears, the efficiency of up to 99%.

5, compact structure, suitable for close-distance transmission.

6, higher manufacturing costs. Some gears with special tooth shapes or high precision require specialized or high-precision machine tools, knives, and gauges, making the manufacturing process complex and costly.

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

8, no overload protection

Types of:

1, according to the relative position of the two axes and the direction of the teeth, can be divided into the following types:

(1) Spur gear drive;

(2) Helical Gear Drive

(3) herringbone gear transmission;

(4) Bevel gear transmission;

(5) Staggered shaft helical gearing.

2, according to the working conditions of the gear, can be divided into:

(1) Open-gear transmission type gears, with gears exposed, do not guarantee good lubrication.

(2) Semi-open gear drive, the gear is immersed in the oil pool and has a shroud, but it is not closed.

(3) Closed gear transmission, gears, shafts, and bearings are all enclosed in a closed box. Lubricating conditions are good, ash is not easy to enter, and installation is precise.

Gear transmission has good working conditions and is the most widely used gear transmission.

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

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

According to the gear tooth profile curve can be divided into involute gear drive, cycloidal gear drive and arc gear drive and so on. A transmission consisting of more than two gears is called a wheel train. Depending on whether there is an axis moving gear in the gear train, the gear transmission can be divided into a common gear transmission and a planetary gear transmission. The gear having the axis movement in the gear train is called a planetary gear. Gear transmission can be divided into closed type according to its working conditions

Gear drive calculations, open and semi-open drives. Sealing the transmission in a rigid casing and guaranteeing good lubrication is called a closed drive and is used more often, especially for gears with higher speeds. Closed drives must be used. Open drives are exposed and do not guarantee good lubrication. They are used only for low-speed or non-essential drives. The semi-open transmission is somewhere in between.