Low-noise planetary gearbox of wind driven generator

Abstract

The invention relates to a speed increasing box, in particular to a low-noise planetary gearbox of a wind driven generator, which comprises an input shaft, a box body, an inner gear ring, a planet gear shaft, a center shaft and a planet carrier. The input shaft is fixedly connected with the planet carrier in a coaxial way. More than two planet gear shafts are uniformly distributed on the planet carrier through bearings. A large planetary gear and a small planetary gear are fixedly arranged on the planet gear shaft. The inner gear ring is fixed and arranged inside the box body. The small planetary gear is normally engaged with the inner gear ring. A sun gear is fixed and arranged on the center shaft. The large planetary gear is normally engaged with the sun gear. The input shaft is connected with the box body through the bearing. The outer diameter of the inner gear ring is smaller than the inner diameter of the box body. A plurality of box body pin grooves are uniformly distributed onthe inner wall of the box body in the circumferential direction. The outer wall of the inner gear ring is provided with an inner gear ring pin groove. An elastic pin is embedded between the box body pin groove and the inner gear ring pin groove. The low-noise planetary gearbox of the wind driven generator has the advantages of low noise, long service life, strong shock resistance capability and low production and processing difficulty.

Description

technical field [0001] The invention relates to a speed-up box, in particular to a low-noise planetary gear speed-up box for a wind power generator. Background technique [0002] The structure of the low-noise planetary gear gearbox for wind power generators is to arrange several planetary gears around the sun gear. The input shaft drives the planetary gears to rotate around the sun gear and drives the output shaft to rotate. This gearbox has the characteristics of a large gear ratio. For example, Chinese patent 200820100520.x discloses a "dual-connected planetary double-arm wind power speed-up gearbox". It has the characteristics of compact structure, small volume and large transmission ratio. However, due to the rigid fixed connection between the inner ring gear and the housing, most of the noise generated by the rotation of the inner gear is transmitted outward through the inner gear ring and the housing, resulting in high noise. In addition, at least two gears of diff...

AI Technical Summary

Problems solved by technology

However, due to the rigid fixed connection between the inner ring gear and the outer casing, the noise of the inner gear rotation is mostly transmitted through the inner ring gear and the outer casing, and the noise is large

In addition, at least two gears of different sizes must be installed on the planetary shaft. In terms of processing technology, it is impossible to process the two gears and the planetary shaft into an integrated structure. The gears and the planetary shaft usually adopt interference fit, which utilizes thermal expansion. The principle of cold shrinkage fixes the gear on the planetary shaft. This connection method is also a rigid connection. When the gear is subjected to a short-term large impact, it is easy to break the teeth, which cannot transmit torque normally and is difficult to adjust; output The shaft adopts a cantilever structure, which is prone to non-parallel swings, causing uneven force on the sun gear, premature wear, and affecting the service life

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