Experimental Study On The Dynamics Of Gas Distribution Mechanism And Wear Of Column

Diesel engine structure mainly has the piston connecting rod component,crankshaft and flywheel,distribution agencies,combustion chamber and fuel supply matching,cooling system,lubricating system,etc,valve-train visible is an important part of the internal combustion engine Design of valve-train is reasonable will affect the dynamic properties of internal combustion engine,as well as the internal combustion engine work stability and durability Of technology with the change of generation,people want to go to more and more high,in the face of increasingly fast work efficiency,improve and optimize the design of valve-train becomes more and more important By the exhaust gate valve-train CAM lifter putter rocker arm and valve springs From these aspects to improve distribution agencies.Based on the valve-train Quanchai factory farm four valve diesel engine as the research object in reference to some of the related literature at home and abroad,of valve-train is diesel engine made a basic introduction and analysis of current situation of the development of the dynamic characteristics of valve-train,and linear optimization design of the CAM and CAM-pretty column for wear and tear of the appear problem,the optimization scheme is proposed and the experimental verification.First of all,combined with the original CAM diagram,using MATLAB software to calculate the speed and the acceleration curve to calculate the maximum contact stress of the cam-supported column with the minimum radius of curvature.Then,based on the dynamic properties of the original,by changing the CAM to optimize design,concrete is to use speed-such as constant speed buffer period and high order polynomial working segments Able to draw more new set of design parameters,the use of MATLAB software,the CAM contour line can be concluded that group make a dynamic analysis of the results of the multiple sets of curve by comparison to select the optimal linear CAM.Second for survive in the emergence of 1.5 mm wear specific analysis,it is concluded that the wear of the reasons,at the time of analysis we have analyzed the four factors of influence factors are respectively the lubrication state,CAM contact surface contact stress,as well as the material match and roughness and tolerance Concluded that the lubrication condition,material and roughness and tolerance is not influence the main factors.The problem might be caused high contact stress 1.5 mm wear by analyzing what factors influence the contact stress,is the spring force and the minimum radius of curvature by optimizing design,and then validated in experiment.