Big load planetary gear bearing support device

Abstract

The invention relates to a bearing support of large-load planet gear, belonging to the planet gear transmission technique, wherein it comprises a planet support (1) and a planet axle (2); the axle (2) is fixed on the support (1); two bearings are parallel arranged along the axle (2) while one bearing is spherical roller bearing (3) and another one is circular roller bearing (4). The invention has high dynamic load ability, better working reliability, simple installment, long service life and lower cost, that 50% reduced cost on bearing.

Description

technical field [0001] The invention belongs to the technical field of planetary gear transmission, and in particular relates to a bearing support device for planetary gears. Background technique [0002] In the field of gear transmission technology, the planetary gear transmission with hard tooth surface has the characteristics of large speed ratio, small size and high load capacity, and has been widely used in important industrial sectors such as wind power generation, metallurgy, and building materials, especially in the wind power generation industry. 70% of the world's wind power generators' main speed-up gearboxes use planetary gear transmission. With the rapid development of wind power generation technology in the world, the transmission power of the planetary gear transmission is increasing, which has reached 5 megawatts at present, and the reliability requirements are higher. Take a 1.5 MW wind turbine planetary gear transmission as an example. If it fails, it need...

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Problems solved by technology

Practice has proved that most of the mechanical failures of planetary gear transmissions in wind turbines come from the premature failure of planetary gear support bearings. Therefore, technicians from various countries design planetary gears based on the characteristics of heavy load, impact resistance, long life and light weight. A variety of planetary gear bearing support devices, there are three common ones: one is to set two single-row cylindrical full-roller bearings side by side on the planetary shaft, and the basic rated dynamic load of single-row cylindrical full-roller bearings is high. The form is currently the most popular, generally considered the most reliable, suitable for medium and large planetary transmissions, but because the single-row cylindrical full roller bearing is designed and produced by the German INA company for fans, the process is complex, the supply exceeds demand, and the price is expensive; the other is in Two spherical roller bearings are arranged side by side on the planetary shaft. The basic dynamic load rating of the spherical roller bearing is the highest, the price is the lowest, and the design calculation life is the highest. However, due to the inevitable errors during processing, the end faces of the inner and outer rings are usually not aligned. The outer end faces of the inner and outer rings are aligned, but the contact between the inner and outer raceways and the rollers is misaligned, resulting in a large difference between the actual life and the design calculation life, and the reliability is not ideal. This structure has been eliminated by a large foreign wind power manufacturing company. The third type is to set two single-row tapered roller bearings side by side on the planetary shaft. The basic dynamic load rating of the single-row tapered roller bearings is relatively high. This structure is suitable for small planetary transmissions and has good reliability, but the price of the bearings is relatively high High, inconvenient to assemble and adjust

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