Design and Analysis of Gantry Type Cylinder Block Structure for New-Type Off-Road Horizontal Diesel Engine

According to the structure features of off-road horizontal diesel engine,a gantry type cylinder block was developed independently on the basis of analyzing existing problems of tunnel type cylinder block.By combination with the free modal test,a finite element analysis model of cylinder block components was established and used to calculate and analyze structure stiffness and strength of the gantry type cylinder block.Results indicate that the new gantry type cylinder block of the horizontal diesel engine is of compact structure and light weight.It has short lubricating passage,high cooling efficiency and easy casting and machining processes.Its low-order natural frequency is higher and overall rigid is good,natural frequencies of all order modals are more than 500Hz.Under the three calculated preloading conditions,i.e.max.torque,1st and 2nd cylinder combustion,the cylinder block does not show high stress concentration and large deformation situations,calculated safety factor is greater than 1.5.Its structural rigidity and strength meet actual use requirements for off-road diesel engine.