Hypocycloid yawing gearbox for wind driven generator

Abstract

The invention relates to the technical field of wind-electricity yawing speed reduction. A hypocycloid yawing gearbox for a wind driven generator comprises a base, an input shaft, a cycloid wheel component, an eccentric bearing, a front base and an output mechanism, wherein the output mechanism comprises an output shaft, a column pin, a column sleeve and a uniform loading ring; the base, a hypocycloid gear ring and the front base are integrally linked in turn; the hypocycloid yawing gearbox is characterized in that a cycloid component is a cycloid rim and cast iron spoke assembly; the thickness of a middle gear is two times of the thickness of equal thick wheels on two sides; a phase difference between the middle gear and the wheels on the two sides is 180 degrees; the eccentric bearing comprises conical roller bearings and eccentric bushings; the conical roller bearings are two back-to-back bearing sets; and a wear-resisting ring is matched in a pin hole of the cast iron spoke in a sliding form. The hypocycloid yawing gearbox has the beneficial effects: a single-stage speed reduction ratio is as high as 143; the structure is compact; the weight is light; the maintenance is convenient; the axial size is short; the cycloid gear teeth do not break, so that the transmission loading force is greater than that of an NGW with three planet gears; and the cost of the present cycloid is less than a half of a planet speed reducer, so that the manufacturing cost is 45-55% lower.

Description

【Technical field】 [0001] The invention relates to the technical field of wind power yaw deceleration, and is an improvement of the invention application "three-piece double cycloid yaw reducer for wind power generation" (201010174525.9), a hypocycloid yaw gearbox for a wind power generator. 【Background technique】 [0002] 7. The yaw gearbox at an altitude of 80 meters must have high overload capacity and high reliability. Zhengzhou Mechanical Research Institute’s “Overview of Wind Power Generation and Wind Power Gearboxes” pointed out: “The damage rate of some wind farm gearboxes is as high as 40-50%. The eclipse exceeds the design expectation." The background technology is mainly a four-level planetary structure: [0003] ① NGC "Yaw Gearbox for Wind Power Generation" ZL200410064930; [0004] ②Heavy teeth "wind power generation yaw reduction gearbox" 200620111262; [0005] ③ Tailong "Wind Power Yaw Reduction Device" 200910034525; [0006] ④ Yinchuan Weili "High-power win...

AI Technical Summary

Problems solved by technology

[0010] ① The safety factor of the existing gearbox is low, and it is prone to early pitting corrosion when subjected to fatigue loads

In addition, fine cracks are prone to appear at the root of the tooth at the stress concentration point of gear hobbing, heat treatment and grinding, which does not have high reliability;

[0011] ②Three planetary gears, the overload capacity is not high;

[0012] ③The four-stage planetary deceleration makes the axial dimension very long, the structure is very complicated, the maintenance is very inconvenient, and the price is high

[0013] (1) Cycloid + secondary planet: Tianjin reducer company "used for wind power generation yaw reducer" 200320111939.2 The disadvantages are: the efficiency is reduced by 2 percentage points, and the bending strength of the high-speed cycloid double fulcrum pin is low, so the overload capacity Low, poor reliability;

[0014] (2) Cycloid + cycloid: "a second-level envelope..." 200920127322.7, the disadvantage is: the efficiency is reduced by 4 percentage points, and the two output shafts are placed between the left and right end discs and the hypocycloid wheel Bearings are 2-3 models larger than normal, and the price is very high

[0015] (3) "Three-piece double cycloidal yaw reducer for wind power generation" (20101017454525.9) is a "cycloid + three-piece double-cycloid" structure, with main disadvantages: ① "Cycloid + three-piece double-cycloid" structure reduces efficiency 4 percentage points, the phase difference of the tricycloid wheel is 120°, and the dynamic balance cannot be achieved, which will affect the service life of the reducer;

[0016] ② Cylindrical roller bearings have a large radial clearance, and the cycloidal wheel produces clicks and clicks when it moves in translation, and shocks occur over time, resulting in damage to the eccentric bearing and failure of the reducer;

[0017] ③The static balance adjustment of the pin hole grinder is troublesome, and the pin hole accuracy is unstable, which will affect the service life of the reducer

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