Cycloidal pin gear reducer is another type of planetary reducer. It is driven by the sun's planetary gears. Just like planets such as the earth and the moon move around the sun. The inside is differential tooth type. There are internal and external teeth. The shape of the teeth is cycloid. Usually, it is output in plane. Empty gyrus and dorsal gap are small. The entrance can usually be controlled within 10 arc minutes.
The cycloidal pin gear reducer is designed according to the principle of planetary transmission with few tooth differences. Planetary gear teeth are cycloid teeth. The sun gear is a needle tooth. The two form a cycloid pin gear combination pair. The difference between the number of pin gear teeth Zp and the number of cycloidal gears Zc is 1. During the transmission process, the rotating arm transmits the input motion to the cycloid gear. Due to the action of the fixed pin gear, the cycloid gear produces a low-speed rotation motion opposite to the input motion. Then output through W mechanism.
Advantages and Disadvantages of Cycloidal Pin Gear Reducer
Advantages:
2. The transmission ratio range is large. Cycloidal pin gear reducer with single-stage transmission ratio of 11 ~ 87. The two-stage transmission ratio is 121 ~ 5133. The three-stage transmission ratio can reach 20339.
3. Stable transmission, high efficiency and high precision. The cycloid pin gear reducer adopts rolling meshing at the meshing part of the tooth surface of the machine. And the gnawing surface has no relative sliding. So, the general efficiency can be above 90%.
4. Simple maintenance and no need for advanced lubricating oil.
5. It is convenient to disassemble and assemble and easy to maintain. The structure design of cycloid pin gear reducer is reasonable. Simple disassembly and assembly are convenient for maintenance. The number of parts used is small. Lubrication is very simple.
6. Long service life and low noise. The principle of planetary transmission is adopted. During operation, the number of gnawing teeth of the pendulum is large. The coefficient of overlap is large. The whole fuselage runs in balance. The main parts are made of bearing steel after quenching and fine grinding. Wear is minimized. The noise emitted during operation is low. The service life is long.
7. The purchase cost is relatively low.
Disadvantages:
1. The load of cycloidal pin gear reducer cannot be too large. No matter how big the reducer is, the central shaft inside is the easiest to break.
2. The pin sleeve is easily damaged under high load.
3. The processing precision of pin shaft and pin sleeve is high and difficult.
4. As shown in the assembly drawing. Disassembly and assembly are troublesome. The maintenance cost is high.
5. The main parts such as cycloid gear, needle tooth pin, needle tooth sleeve, column pin and column pin sleeve are all made of GCrL5 bearing steel with good material. And some parts require high manufacturing accuracy. The manufacturing process is complicated.
6. The bearing force of the rotating arm shaft is large. And the rotation speed is slightly higher than that of the high-speed shaft. Therefore, the rotary arm bearing is the weak link of the reducer. The speed of the high-speed shaft and the power transmitted are limited. In general, the rotation speed of high-speed shaft Nh ≤ 1500 ~ 1800 rpm. At present, the maximum power has exceeded 100 kilowatts.
