Multiple Layer Valve Seat Of Engine Contact Properties

As an engine friction pair, the valve-valve seat is important. Its matching performance directly affects the dynamic performance and its life. Based on this, how to choose material under the condition characteristics is very important. This article discusses the design principle and the structure of the specific form based on the present valve-valve seat commonly used material and complex layer structure by analyzing the characteristics of contact and the matching of the material properties.This article analyzes the friction pair matching material properties based on the working conditions of valves and valve seat material requirements. In order to establish matching contact model, this paper constructed dynamics analysis interface. Setting the valve parameter, inputting valve structure parameters by using MATLAB software platform, can draw the need of valve movement curve. Through this system we can call MATLAB program, analyze the valve dynamic, improve the analysis of the contact of valve-valve seat the efficiency and reliability.At the same time, this paper using Ansys/ls-dyna software platform establish the pair of friction collision contact simulation model based on dynamic contact theory, and with several valve seat plate department cladding layer as a typical case, analyzed the effective stress distribution in the process of the drop test. Research shows that: the material properties and complex thickness affect equivalent stress much, for example, the matching of material elastic modulus E and density p influence the forces σn much, and presents the nonlinear relationship; Layer thickness h equivalence effect force σn has a very big impact, and also has the nonlinear phenomenon. For the final discussed several complex layer material character, TiO2in a thick layer of0.6mm is the best.This paper based on Ansys software platform simulates the influence of valve working condition to the matching, and discusses the contact surface force distribution when the use matching, and tries to find reasonable design methods, for the engineering application.