But with everyone's Planetary reducer The problems of more in-depth understanding, gradual improvement of structure, improvement of production and manufacturing technology, and inconvenience in production and manufacturing are slowly being solved. Thus, the planet Reducer Get increasingly widespread use. Explain in detail the internal structure of the planetary reducer and the basic working principle of the planetary reducer.
Transmission principle of planetary reducer
The transmission structure of planetary reducer is at present Gear reducer For the combination with high efficiency, the planetary reducer basically has the following transmission structure:
Basic transmission structure of planetary reducer
A. Sun gear
B. Planetary gear (combined with planetary carrier)
C. Internal gear ring
C. Engaging Gear usingconnectedsection ` gear
E. Planetary carrier
F. Output shaft
Basic transmission structure of planetary reducer
The drive source operates the sun gear by means of straight knot or connection, and the sun gear will work with the planet gear combined on the planet carrier to drive the normal operation. The whole set of planetary gear system rotates in full automatic bypass along the outer gear ring, and the planetary carrier is connected to the output shaft to achieve deceleration significance. Higher reduction ratios are accumulated by multiplying many stage gears and planetary gears.
The planetary reducer is closely connected to the gearbox housing by an internal gear ring (A). At the center of the ring gear, there is a sun gear (B) driven by external driving force between them. There is a group of planetary gear sets (C) which are composed of three gears equally on the tray. The group of planetary gears floats in the period by virtue of the output shaft, internal gear ring and sun gear support; When the driving force at the input side drives the sun gear, it can drive the planetary gear to rotate, and follow the motion track of the inner gear ring to revolve along the center point. The rotation of the planets affects the output shaft connected to the tray to output the driving force.
Planetary gear reducer Features of
Gear engagement
High torque and impact resistance: the structure of planetary gear is different from the normal operation form of traditional planetary gear. Traditional gears are driven by only a few contact extrusion points between two gears, and all loads are concentrated on a few gear surfaces that touch each other (Figure 1), which is very easy to cause friction and fracture of gears. The planetary reducer has six gear contact surfaces with a larger area for 360 ° uniform load (Figure 2). Many gear surfaces together uniformly carry the impact load at the moment, making it more capable of carrying higher torque impact. The parts and components of the rolling bearing will not be damaged or broken due to long-term load.
Planetary gear engagement
Small size and light weight: In the design of traditional gear reducer, several sets of big and small gears are offset to staggered drive for reduction, because the reduction ratio must double the total number of two gears, and the gear specifications must have a corresponding distance between meshing, so the gear box includes areas with large ratio, Especially when the combination of high speed ratio is composed of two or more reduction gearboxes, the structural strength and tensile strength become weak, and the total length of the gear box increases, resulting in very large volume and total weight. The planetary reducer can be repeatedly connected according to the required number of segments, and many segments can be carried out independently.
Division of transmission ratio of planetary reducer
Because the transmission ratio of single-stage gear reducer is not more than ten, when the total transmission ratio exceeds this value, two-stage or multi-level reducer shall be selected. At this time, the effective distribution of transmission ratios at all levels should be taken into account, otherwise it will affect the size of reducer specifications and whether the bearing capacity can be fully utilized. According to the difference of operating regulations, the transmission ratio can be divided according to the following basic principles:
(1) Make the bearing capacity of all levels of transmission nearly the same;
(2) Make the external contour specification and quality of the reducer smaller;
(3) Make the transmission have small inertia moment;
(4) Make the oil immersion depth of big gears in all levels of transmission roughly the same
