Chapter3MechanismofCamshaft3.1StructureandFunction3.1StructureandFunctionValvelayout:ToponcylinderSideoncylinder3.1StructureandFunction3.1StructureandFunction3.1StructureandFunction3.1StructureandFunction3.1StructureandFunction3.1StructureandFunctionCamshaft(P1-4):valvedrivingunitRockerarmValvespringValveseatPushrodGear3.1StructureandFunction3.1StructureandFunction3.1StructureandFunction3.1StructureandFunction3.2partsA)菌式：实心体，适用于侧置气门式配气机构。B)筒式：上面凹腔与推杆球面接触，推杆作小幅度摆动，适用于顶置气门式配气机构（质量小）。C)滚轮式：底面是滚轮，改善磨损，减小侧压力，船用机。Camshaft:凸轮轴Cam,helixgear,biascam.凸轮、螺旋齿轮、偏心轮。3.2parts3.2parts3.2parts3.2partsP1-4.Valveleadandvalvelag.Way：openearlyandcloselate.Purpose:Maximumforamountofcharge.Whendosetheintakevalveclose?3.3ValvetimingandLayoutSummery