Research On Key Design Parameters Of Interlocking Hydraulic Cylinder Locking

The outrigger cylinder is used as the construction vehicle supporting the positioning structure,and the hydraulic cylinder needs to be locked when the vehicle is working.At present,the commonly used hydraulic locking method,because the hydraulic cylinder inevitably has a certain leakage,affects the stability of the vehicle.For radar vehicles with extremely high precision requirements,the vehicle performance is seriously affected.Therefore,the new leg cylinder locking method is used to improve the cylinder lock performance,which is of great significance to the performance guarantee of the radar vehicle.The interference-locking hydraulic cylinder has been widely used in tactical vehicles such as radar vehicles and missile launch vehicles because of its high locking precision and unrestricted locking position.However,the severe swear problems of pistons and cylinders which are often happen premature reduce it's service life and operating reliability.To solve this problem,the theoretical research and finite element analysis was used in this paper to study the contact stress distribution between the piston and the cylinder.It was found that there is a serious contact stress concentration at both ends of the piston,which is a key factor leading to early wear of the cylinder.And the stress concentration factor(SCF)is serious affected by the contact stiffness,but it is weak affected by the piston length and the interference amount.In general,SCF is about 3.0.The reason for stress concentration is the contact boundary effect between pistons and cylinders.To reduce SCF,3 improvement methods on cylinder design are proposed.The analysis results show that the SCF can be reduced greatly if the interior of the piston is cut off by a cone surface,Which is an effective structural optimization method.The rounded or inverted angle of the piston end is not conducive to reducing the stress concentration factor.Finally,the influence of three factors,such as interference,friction coefficient and piston inner diameter,on the axial ultimate bearing capacity of the new hydraulic cylinder is discussed.The results show that the axial ultimate bearing capacity of the hydraulic cylinder is significantly affected by the interference and friction coefficient,and increases linearly with the increase of the interference and friction coefficient.When the inner diameter of the piston decreases,the axial ultimate bearing capacity increases.small.The axial bearing capacity of the hydraulic cylinder can be improved by reasonably increasing the interference and selecting a material with a large friction coefficient.The research results in this paper provide a theoretical basis for optimizing the design of the interference-locking cylinder and improving the operational reliability of the radar vehicle and missile launch vehicle leveling system.