Gearbox has a wide range of applications, such as the application in wind turbine. Gearbox is an important mechanical component widely used in wind turbine. Its main function is to transfer the power generated by the wind wheel under the action of wind to the generator and make it get the corresponding speed.
Usually, the speed of the wind wheel is very low, which is far from the speed required by the generator. It must be realized through the speed increasing effect of the gear pair of the gearbox, so the gearbox is also called the speed increasing box.
20+ More than 20 years experience in research
5000+ Total factory is 50,000 square meters
50+ Including around 50 R&D Personnel
More than 20 years experience
Including around 50 R&D Personnel
Total factory is 50,000 square meters
When the gearbox bears the force from the wind wheel and the reaction force produced by the gear transmission, it must have enough rigidity to bear the force and torque, prevent deformation and ensure the transmission quality. The design of gear box should be carried out according to the layout arrangement, processing and assembly conditions, easy inspection and maintenance of wind turbine power transmission. With the rapid development of the gearbox industry, more and more industries and different enterprises have applied to the gearbox, and more and more enterprises have grown in the gearbox industry.
The external gear of wind power gearbox generally adopts carburizing quenching grinding process. With the introduction of a large number of high-efficiency and high-precision CNC gear grinding machines, there is no big gap between China and foreign countries in gear finishing level, and there is no technical difficulty in reaching the 5-level accuracy specified in 19073 standard and 6006 standard. However, there is still a gap between China and foreign advanced technology in the aspects of heat treatment deformation control, effective layer depth control, tooth surface grinding tempering control, tooth modification process, etc.
The commonly used lubrication methods of gear box
The commonly used lubrication methods of gear box include gear oil lubrication, semi fluid grease lubrication and solid lubricant lubrication. Gear oil can be used for better sealing, high speed, large load and good sealing performance; semi fluid grease can be used for poor sealing and low speed; molybdenum disulfide superfine powder can be used for no oil or high temperature occasions.
The lubrication system of gearbox
The lubrication system of gearbox is very important for the normal work of gearbox. The gearbox of large-scale wind power generation must be equipped with a reliable forced lubrication system to spray oil on gear meshing area and bearing. Among the causes of gearbox failure, insufficient lubrication accounts for more than half. The temperature of lubricating oil is related to the fatigue of components and the life of the whole system.
In summer, because the wind turbine
In summer, because the wind turbine is in full operation for a long time, coupled with high-altitude direct sunlight, the operating temperature of oil products rises more than the set value; while in the northeast cold region in winter, the minimum temperature often reaches below – 30 ℃, the lubricating oil flow in the lubrication pipeline is not smooth, and the lubrication of gears and bearings is not sufficient, resulting in the high temperature shutdown of the gearbox, and the wear of tooth surfaces and bearings.
It is suggested to design a lubricating
It is suggested to design a lubricating oil heat management system for the gearbox lubrication system: when the temperature exceeds a certain value, the cooling system starts to work, when the temperature is lower than a certain value, the heating system starts to work, and the temperature is always controlled in the best range. In addition, improving the quality of lubricating oil is also an important aspect that must be considered in the lubrication system. Lubricant products must have excellent low-temperature fluidity and high-temperature stability. It is necessary to strengthen the research on high-performance lubricating oil.
“Gear box is an important part widely used in mechanical transmission. When a pair of gears are meshed, due to the inevitable errors of pitch and tooth profile, meshing impact will occur in the process of operation, resulting in the noise corresponding to the meshing frequency of gears, and friction noise will also occur between the tooth surfaces due to the relative sliding. Because gear is the basic part of gearbox transmission, it is necessary to reduce gear noise for controlling gearbox noise.”
“The operating temperature of the bearing, the viscosity and cleanliness of the lubricating oil, and the rotating speed have a great influence on the bearing life. When the operating state becomes worse (the temperature rises, the rotating speed decreases, and the pollutants increase), the bearing life may be greatly reduced.”
Functions And Uses
Acceleration and deceleration is commonly known as the gearbox.
Changing the direction of transmission, for example, we can use two sector gears to transfer the force vertically to another shaft.
Change the rotational torque
Change the rotational torque. Under the same power condition, the faster the speed of the gear, the smaller the torque on the shaft, and vice versa.
Clutch function: we can separate the engine from the load by separating the two original meshing gears. Such as brake, clutch, etc.
Distribute power. For example, we can use one engine to drive multiple slave shafts through the gearbox spindle, so as to realize the function of one engine driving multiple loads.
Acceleration and deceleration
Acceleration and deceleration, which is commonly known as the gearbox
Change the transmission direction
Change the transmission direction. For example, we can use two sector gears to transfer the force vertically to another shaft.
Change the rotation torque
Change the rotation torque. Under the same power condition, the faster the speed of the gear, the smaller the torque on the shaft, and vice versa.
Clutch function: we can separate the engine from the load by separating the two gears that were originally meshed, such as the brake clutch.
Because gear is the basic part of gearbox transmission, it is necessary to reduce gear noise for controlling gearbox noise. Generally speaking, the main causes of gear system noise are as follows:
- Gear design. Improper parameter selection, too small overlap, improper or no profile modification, unreasonable gearbox structure, etc. In gear processing, the pitch error and tooth profile error are too large, the backlash is too large, and the surface roughness is too large.
Gear train and gearbox
- Gear train and gearbox. Assembly eccentricity, low contact accuracy, poor parallelism of shaft, insufficient stiffness of shaft, bearing and support, low rotation accuracy and improper clearance of bearing, etc.
- Input torque from other aspects. Fluctuation of load torque, torsional vibration of shafting, balance of motor and other transmission pairs, etc.