| The gear-shaft-sliding bearing system is an important form in mechanical transmission.It has the characteristics of compact structure,strong carrying capacity,high transmission efficiency and reliable working performance.It is widely used in the mechanical industry.With the continuous development of modern industry,the level of advanced manufacturing technology continues to improve,the requirements for system transmission characteristics are getting higher and higher,mainly reflected in light weight,high efficiency,high precision and high stability.The gear is the core component of the gear-shaft-sliding bearing system.The static contact and dynamic transmission characteristics of the gear pair are the basis and key to study the transmission system.The high precision of the transmission system requires the stability of the gear-shaft assembly to reduce the transmission error,vibration and noise.The contact edge effect of the assembly is the main cause of the fatigue failure of the key parts of the system.It is especially important to study the stress characteristics of the assembly joint surface.At the same time,the bearing capacity and temperature rise effect of sliding bearings are important factors affecting the performance and safety of the system.Under high-speed and heavy-load conditions,it is easy to cause vibration and noise of the transmission system,and the resulting reduction in mechanical transmission efficiency and reduced stability will have a serious impact on the transmission characteristics and working life of the system.Based on the above problems,this paper intends to use the gear-shaft-sliding bearing system as the research object.Starting from the theoretical calculation model of the system,the simulation study of the transmission characteristics of the system considering the gear-axis interference assembly is carried out.The main work contents are as follows:In order to study the influence of gear-axis interference assembly on the transmission characteristics of the system,this paper intends to establish a gear-axis interference assembly ANSYS simulation model by contact offset method to study the stress characteristics of the assembly joint surface,and compare it with the ideal gear pair Hertz contact stress.The analysis reveals the influence of the assembly interference on the transmission characteristics of the system and provides theoretical support for the interference assembly design.In order to study the influence of the key performance of the sliding bearing on the transmission characteristics of the system,this paper intends to reveal the influence of different parameters on the bearing performance based on Reynolds equation and MATLAB numerical analysis method,and propose a sliding bearing structure optimization method with a gravure on the surface to determine center position of the gear-shaft-sliding bearing system and the working center distance to achieve the purpose of reducing the working temperature rise and improving the stability of the system.In order to accurately simulate the service state of the transmission system and analyze its working performance,this paper intends to use the overall system of gear,transmission shaft and sliding bearing combination as the research object,establish a three-dimensional dynamic simulation model,and obtain the stress-strain time response curve in the system transmission process.And explore the impact of speed on the transmission characteristics.It provides theoretical basis for the overall structural design and performance research of the transmission system,and has important practical significance. |
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