Issue 158: Hengyu national strength interpretation of the structure and transmis
Time：2020-04-29 | Source：恒宇国强 | Browse：195713
With the deepening of people's understanding of planetary reducer, the continuous improvement of structure, the improvement of manufacturing process and the problems of manufacturing difficulties are gradually being overcome. Therefore, planetary reducer has been widely used. The transmission principle of planetary reducer is introduced below.
The transmission structure of planetary reducer is the combination with the highest efficiency of gear reducer at present. The basic transmission structure of planetary reducer is as follows:
A. Sun gear
B. Planetary gear
C. Internal gear ring
C. Using connected section ` gear
E. Planetary carrier
F. Output shaft
The driving source starts the sun gear in a direct connection or connection mode, and the sun gear drives the planetary gear combined on the planet carrier. The whole set of planetary gear system automatically rotates around the outer gear ring, and the planetary carrier is connected with the output shaft to achieve the purpose of deceleration. The higher reduction ratio is obtained by multiplying and accumulating multiple sets of stage gears and planetary gears.
The planetary reducer is closely combined with the gearbox shell by an inner gear ring (a), and there is a sun gear (b) driven by external power in the center of the ring gear. Between them, there is a group of planetary gear sets (c) equally combined on the tray by three gears. The group of planetary gears float during the period relying on the output shaft, inner gear ring and sun gear; When the power on the input side drives the sun gear, it can drive the planetary gear to rotate and revolve along the center according to the track of the inner gear ring. The rotation of the planet drives the output shaft connected to the tray to output power.
Characteristics of planetary gear reducer
High torque and impact resistance: the structure of planetary gears is different from the operation mode of traditional planetary gears. Traditional gears only rely on a few point contact extrusion drives between two gears, and all loads are concentrated on a few gear surfaces in contact (Fig. 1), which is easy to produce friction and fracture of gears. The planetary reducer has a 360 degree uniform load on six gear contact surfaces with a larger area (Fig. 2). Multiple gear surfaces jointly and evenly bear the instantaneous impact load, making it more able to withstand higher torque impact. The rest and major bearing parts will not be damaged and broken due to high load.
Small volume and light weight: the design of traditional gear reducer has multiple sets of large and small gears offset to staggered drive deceleration, because the reduction ratio must double the number of two gears, and the size of the gears must have a certain distance between bite. Therefore, the gear box contains large space, especially when the combination of high-speed ratio needs to be combined by two or more reduction gear boxes, The structural strength is relatively weakened, and the length of the teeth is longer, resulting in huge volume and weight. The structure of the planetary reducer can be repeatedly connected according to the required number of segments, and multiple segments can be completed separately.
Distribution of transmission ratio of planetary reducer
Since the maximum transmission ratio of single-stage gear reducer does not exceed 10, when the total transmission ratio is required to exceed this value, two-stage or multi-stage reducer shall be used. At this time, the reasonable distribution of transmission ratios at all levels should be considered, otherwise it will affect the overall dimension of the reducer and whether the bearing capacity can be brought into full play. According to different use requirements, the transmission ratio can be distributed according to the following principles:
(1) Make the bearing capacity of all levels of transmission close to the same;
(2) Minimize the overall dimension and mass of the reducer;
(3) Make the transmission have the minimum moment of inertia;
(4) Make the oil immersion depth of large gears in all levels of transmission approximately equal.
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