What are the advantages and disadvantages of the cycloidal gear reducer and the planetary gear reducer?
When the input shaft with an eccentric sleeve to rotate in a week, because of the characteristics of the cycloidal gear teeth profile and the needle tooth limit of the needle gear, cycloid motion become both plane motion and rotation of the revolution, the input shaft rotates week, eccentric sleeve also rotates a circle, cycloid gear to the opposite direction around a tooth to decelerate, and then using the W output mechanism, cycloidal wheel rotation speed will be through a pin shaft, is transmitted to the output shaft, so as to obtain the output low speed. - cycloid reducer, high speed and high efficiency characteristics than single stage transmission, can achieve 1:87 reduction ratio, efficiency is more than 90%, if the use of multistage transmission, gear ratio greater. Compact structure, small size, due to the adoption of planetary transmission principle, the input shaft output shaft on the same axis line, so that its models as small as possible size. For stable operation low noise cycloid gear number, large overlap coefficient and has mechanical balance mechanism, the vibration and noise to a minimum degree
The working temperature is -25 degree centigrade to 100 degrees Celsius, by changing the lubricating grease can change its working temperature. Several concepts about planetary gear reducer series: planetary gear sets. Because of a set of star gear can not meet the large transmission ratio, sometimes 2 or 3 to meet the requirements for a large transmission ratio. Due to the increase of the number of star gear, so the 2 or 3 stage reducer length will increase, the efficiency will be decreased. The return gap: the output end is fixed, the input end of the clockwise and counter clockwise, the rated torque +-2% torque when the input speed reducer input end has a slight angle displacement this is the return gap, angular displacement. The unit is "points", that was 1/60. It was also known as backlash. Planet cycloid reducer: all transmission device can be divided into three parts: input part, reduction Speed section, output section. Double eccentric sleeve is provided with a dislocation of 180 degrees on the input shaft, the eccentric sleeve is provided with two known as the roller bearing of the rotary arm, formation mechanism, H two is the center hole of the cycloid raceway of bearing eccentric sleeve, and by a group of pin tooth cycloidal gear and annular arrangement the needle on the gear meshing, to form a tooth for tooth difference internal gear reducer, (in order to reduce friction, gear ratio in small, with a needle tooth pin gear).
Planetary gear reducer: main transmission structure: planetary gear, sun gear, outer ring gear planetary reducer. Because of structural reasons, single reduction of minimum 3, maximum of less than 10, the common gear ratio: 3.4.5.6.8.10 reducer series, generally not more than 3, but some large reduction of 4 reduction ratio custom reducer. Compared with other reducer, planetary gear reducer with high rigidity, high precision (single stage can be done within 1 minutes), high transmission efficiency (single 97%-98%), high torque / volume ratio, the characteristics of lifelong maintenance. Because of these characteristics, the majority of planetary gear reducer is installed in the stepping motor and servo motor. To reduce speed, improve the torque, inertia, rated input speed reducer. The maximum can reach 18000rpm (with the size of the speed reducer, the reducer, the rated input speed is smaller than the industrial grade), the output torque of a planetary gear reducer No more than 2000Nm, special Super torque planetary reducer can do more than 10000Nm
