Introduction
As the core power system of aircraft, the performance of aeroengine refers to The accuracy of the plane directly affects its flight capability and safety performance As an important part of the aero-engine, the entire transmission system plays a crucial role in the stability and reliability of the system. Therefore, How to optimize the design parameters of face gears and achieve high efficiency transmission This article will discuss the important challenges faced by aero-engine surface gears Starting from the basic theory of wheel drive, the dynamic characteristics of the Analyze the tooth profile and supporting structure of the central transmission of the opposite gear, and propose Design scheme.
Basic principle of face gear transmission
Face gear transmission is a common transmission method that achieves power transmission through the mutual meshing of cylindrical gears and face gears. Face gear transmission has the characteristics of simple structure, high load capacity, and high torque, so it is widely used in central axis drive systems in aeroengines. In order to ensure the normal operation of the face gear transmission system, multiple factors need to be considered, such as material selection and tooth profile design. Among them, material selection has a crucial impact on the performance of the face gear transmission system, and alloy steel or high-temperature alloys are usually used. Tooth profile design needs to ensure the accuracy and shape of the tooth profile to meet practical needs.
Meshing characteristics of face gear transmission
The cylindrical gear in the face gear transmission is the same as the tool used in machining the face gear, and the meshing is theoretically a line contact. However, due to various errors such as motion errors and assembly errors, line contact cannot be achieved in practice. At the same time, in order to improve the meshing performance, point contact face gears have been developed. Using a tool with 1-3 more teeth than the cylindrical gear in phase meshing to process, the contact area is localized to achieve point contact transmission. In order to obtain better performance, different materials and process technologies can be used to improve the wear resistance and corrosion resistance of the gear, thereby improving the reliability of the face gear transmission system. In addition, the shape and size of the gear can be adjusted to ensure that they can better adapt to various working environments; for example, using computer-aided design tools such as CAD/CAE software to help engineers more accurately calculate and simulate various parameters in the face gear transmission system.
Efficiency of Face Gear Transmission
The efficiency of face gear transmission refers to the ratio between output power and input power. Usually, the efficiency of face gear transmission is about 80%. However, in practical applications, due to various factors such as friction and aerodynamic resistance, the efficiency of face gear transmission may be affected to some extent. Therefore, in order to improve the efficiency of face gear transmission system, corresponding optimization design is needed. The efficiency of face gear transmission system is mainly affected by many aspects such as gear design, gear clearance, gear material and processing technology. By reasonably controlling these factors, a higher efficiency of face gear transmission can be achieved. For example, using high-strength alloy steel to manufacture gears and reducing gear clearance can effectively improve the efficiency of face gear transmission system. In addition, some auxiliary measures can be taken to further improve the efficiency of face gear transmission system, such as using lubricants to reduce friction and air resistance.
Meshing stiffness of face gear transmission
The meshing stiffness of face gear transmission is an important factor affecting the performance of face gear transmission. However, due to the structural characteristics of face gear transmission, its meshing stiffness is relatively low, so it needs to be optimized and improved. In face gear transmission, the magnitude of the meshing stiffness directly affects the efficiency and stability of the transmission system. The meshing stiffness of face gear transmission is mainly affected by factors such as material and processing accuracy. Different materials have different mechanical properties, such as hardness and elastic modulus, which can affect the meshing stiffness of face gear transmission. Processing accuracy is also a factor affecting the meshing stiffness of face gear transmission, as the roughness of the tooth profile can affect the friction coefficient between tooth surfaces, thus affecting gear meshing. In order to improve the meshing stiffness of face gear transmission, it can be achieved by selecting suitable materials and improving processing techniques.
Meshing force of face gear transmission
The magnitude of the meshing force is closely related to factors such as tooth profile and tooth pitch. Therefore, in order to better understand the meshing characteristics of face gear transmission, it is necessary to analyze the meshing force. In practical applications, numerical simulation methods are often used to solve the magnitude of the meshing force. For example, finite element method or finite difference method are used to solve the meshing force problem. In addition, experimental data can also be used to verify theoretical results. It should be noted that due to certain gaps and frictional resistance in face gear transmission, the magnitude of the meshing force may be affected.
Meshing impact of face gear transmission
To reduce the impact of meshing, several methods can be used for optimal design. One common method is to adjust the meshing clearance by changing the tooth profile parameters. In addition, lubricants or coatings can be used to improve lubrication performance and reduce wear. In addition, special materials or structural designs can also be considered to mitigate the impact of shock on the system. In practical applications, meshing shock in face gear transmission is an important issue. In face gear transmission, meshing shock is closely related to factors such as tooth profile parameters and tooth pitch. When the meshing clearance becomes larger, the meshing shock will also increase accordingly. Therefore, in order to reduce meshing shock, the meshing clearance should be minimized as much as possible. There are also other types of C shocks in face gear transmission systems. For example, shocks caused by axial runout of the gear shaft and shocks caused by misalignment of gear teeth can all lead to failure of the face gear transmission system. Therefore, in the design process of face gear transmission, it is necessary to pay attention to the influence of these factors and take corresponding measures to control them.
Design of face gear central transmission
Gear design and improving its load-bearing capacity, the design of aircraft gears often tends to choose lower modulus and larger number of teeth. When the modulus m is determined to be 3.5mm, a spur gear with 45 teeth will be used. Considering the design requirements of the aircraft’s supporting drive system, the number of teeth of the face gear is set to 57. After considering space and strength requirements, it was decided to set the internal radius of the face gear to 97mm and its external radius to 124mm (i.e., tooth width of 28mm). On this basis, a method was adopted to prevent the sharpening of the tooth tip caused by the expansion of the tooth width, which is to chamfer the outer diameter tooth tip.
Supporting structure design
The supporting structure of the central transmission refers to the components used to support and transmit power in face gear transmission. Its main function is to withstand axial forces and torques, ensuring the normal operation of the face gear transmission system. The design of the supporting structure requires consideration of multiple factors, including material selection, dimensional accuracy, and load-bearing capacity. For the material of the supporting structure, high-strength, wear-resistant, and easily processed materials should be selected. Common materials include steel, aluminum alloy, and composite materials. The size and shape of the supporting structure also have a significant impact on the performance of the entire system. The size of the supporting structure should be able to accommodate all parts in the face gear transmission and withstand corresponding loads. At the same time, the shape of the supporting structure can effectively reduce the impact of axial forces and balancing forces, improving the efficiency of the system. The supporting structure of the central transmission mainly consists of bearings, bearing seats, and housings. Among them, the material and size of the bearing determine its load-bearing capacity. The bearing seat plays a role in fixing the bearing to ensure that it does not deform or loosen. The housing wraps up the entire supporting structure to protect internal components from external environmental influences. According to the design results of the tooth profile and the mechanical properties of face gear transmission, considering the application requirements of the engine rotor, it was decided to adopt the supporting structure shown on the face gear central transmission system. The driving wheel will mainly bear the axial force generated by the mutual meshing of the high-pressure rotor of the engine and the gear, and will be supported by angular contact ball bearings. The driving wheel is mainly responsible for gear The radial pressure generated by meshing is transmitted through two cylindrical roller bearings. The driving face gear shaft acts as the input shaft, while the driven cylindrical gear shaft acts as the output shaft.
Epilogue
When designing an intelligent correction system for mining belt conveyors, image acquisition and processing technology need to be considered. The system should be equipped with high-resolution cameras to capture high-definition images of the belt operation in real time, and then extract key information such as belt edges and positions through image processing software. In this process, the selection of image recognition algorithms is crucial, requiring high accuracy and fast response capabilities to ensure the timeliness and effectiveness of correction control. At the same time, considering the complexity of the mining environment, the hardware part of the system needs to have anti-vibration, dustproof, corrosion-resistant and other characteristics to ensure long-term stable operation. In summary, the design of an intelligent correction system for mining belt conveyors based on image recognition not only involves complex electrical technology and computer vision technology, but also needs to consider the special environment of mining production and the requirements of efficient transportation. With the help of integrated high-precision image processing technology, advanced control algorithms, and stable and reliable hardware systems, it can significantly improve the operational stability and efficiency of belt conveyors, which has great practical value for mining production.