دانلود کتاب Automotive Engine Valve Recession (Engineering Research Series (REP))

An “Engineering Research Series” title. Valve wear and its effect upon engine performance still presents a majorchallenge to the tribologist. Although new valve materials and production techniques are constantly being developed, these advances have been outpaced by demands for increased engine performance. The drive for reduced oil consumption and exhaust emissions, use oflead-replacement and low-sulphur fuels, and the introduction of alternative fuels such as gas all have implications for valve and seat insert wear.Automotive Engine Valve Recession aims to provide the reader with a complete understanding of valve recession. The fundamental nature of contact and wear between valves and valve seats is considered, followed by an outline of the essential features of valve operation and the potentially serious problems associated with wear and valve recession in automobile engines. An overview isthen given of an experimental study of valve wear and the development of special apparatus for the simulation of engine operating conditions carried out in the School ofMechanical Engineering, University of Sheffield, UK.CONTENTS INCLUDE:IntroductionValve operation and designValve failureAnalysis of failed componentsValve and seat wear testing apparatusExperimental studies on valve wearDesign tools for prediction of valve recession and solving valve failure problems.