Describe the advantages of the internal planetary gear transmission in electric hoists
Publication Time:
2022-03-16
Author:
Taide Huafu Crane Equipment Co., Ltd., Dongguan
Source:
(1) High transmission ratio. The single-stage transmission ratio is above 10 ~ 1000 and above, and the two-stage transmission ratio can reach 10000。
(2) High load-carrying capacity. Due to the small tooth difference, the radius of curvature of the inner meshing is close, the tooth shape difference is minimal, and the meshing is almost full tooth surface contact, the Hertz stress on the tooth surface is small. After the single eccentric shaft center input is changed to multiple eccentric shaft inputs, the single swing arm bearing is changed to multiple swing arm bearings to share the load, and the service life of the swing arm bearing can reach 2 ten thousand h . Driven by multiple external gears and the internal center gear, the load is shared by multiple external gears, improving the overall load-carrying capacity. The instantaneous overload capacity is prominent, which is 2.7 ~ 4.0 times the rated load. The output shaft torque is as high as 400kNm。
(3) High transmission efficiency. Compared with the same K-H-V type of small tooth difference planetary transmission, because it eliminates the W output mechanism, and the swing arm bearing force is only K-H-W of the swing arm bearing force of the same type of small tooth difference planetary transmission 60% . In addition, the rotation directions of the two gears in the internal involute gear transmission are the same, and the relative angular velocity is small, which reduces the relative sliding speed between the tooth profiles, so the internal involute gear transmission has less friction. Furthermore, since the directions of the driving and driven gears are the same, the lubricating oil will not be squeezed out, and the friction loss is small. Therefore, the internal involute gear transmission has high efficiency, the meshing efficiency is greater than 95% ，and the overall efficiency is above 85% ，and the efficiency of the transmission device will not decrease with the increase of the transmission ratio, which is unmatched by other transmission devices.
(4) Electric hoist compact structure, small size, and light weight. There is no planetary carrier of a general planetary gear transmission and no output mechanism of a small tooth difference planetary transmission, simplifying the mechanism and retaining the characteristics of a compact coaxial dynamic shaft transmission structure. The weight is reduced compared to ordinary gear reducers 1/3 ~ 2/3 ，and the load-carrying capacity is greater than that of a cycloidal pinwheel reducer of the same volume 40%。
(5) Wide range of power transmission, up to 1000W and above.
(6) Wide range of applications. It can be integrated with the motor, it can be integrated with the drum, and it can also be integrated with the brake to act as a safety brake.
Compared with domestic advanced transmission devices, the internal involute gear transmission device has excellent performance and smaller size.
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