ZL50 Reliability Analysis Of Loader's Hydraulic Drive Transmission Shaft Design Optimization

The Loader was a kind of important construction machinery.It can be used to Shovel,digging, equipment,transport,and disposal bulk materials,it can also be used for clean-up or formation venues.The Loader Had been widely used in the present in civil engineering,highways,railways, bridges,tunnels,water conservancy and hydropower,mining projects in the construction and production.In this paper,the purpose of the study was to identify the reliability index gap between actual indicators and the allowable index of the hydraulic system of the ZL50 Loader.The reliability after the redistribution with the reasonable reliability allocation method can meet the indicators of the requirements system.In this paper,the main results are as follows:1.The actual reliability was only equal to 0.87,by the qualitative analysis and quantitative calculation of the reliability of the ZL50 Loader with reliability analysis method.2.The Alinshi distribution method was used to distribute preliminary reliability of the complete machine system which the allowable reliability was equal to 0.90,the allowable reliability of engine subsystem,transmission subsystem,hydraulic subsystem,the agencies subsystem and other subsystem,was R₁=0.9764,R₂=0.9811,R₃=0.9731,R₄=0.9811,R₅=0.9842,respectively.3.In view of the actual reliability of the hydraulic system of the ZL50 Loader was only equal to 0.87,lower than significantly,reliability required R₃=0.9731,which the complete machine system allowable reliability was 0.90,the distribution method of value predicted was used to redistribute the reliability,the reliability of subsystem was in the Table 4-1.4.The optimize design objectives was lightest weight,the design parameters included the size of inner diameter and outer diameter.The constraints conditions included the reliability of transmission shaft force features,manufacturing process requirements.The mathematical reliability model corresponding optimum design was established with application of the theory of fuzzy.The asymmetric cut set methods in fuzzy level was used to transform the fuzzy optimum model into conventional optimum model,then the optimization problems was solved with preparation process.The optimization results showed that the shaft cross-sectional area was less than 8.57%of the original design,the inner diameter was 92mm,the outer diameter was 100mm,the cross-sectional area was 1206.3716mm².