H1F Turbocharger

The theory of multibody system dynamics is used to simulate valve trains’kinematics and dynamics characteristics , and the methods of establishing and analyzing the multibody sys-tem dynamics model for valve trains are discussed. Since most of the flexible bodies of a valvetrain are slender parts , the finite segment method is used to build their models. Other parts such as cams , valve heads etc. , are built as rigid bodies. After applying the constraints , forces andmotions , the establishing of the whole system is accomplished , and the Lagrange’s multiplier method can be used to obtain its dynamics constitutive equations. As an example , a valve trainps multibody system model of 4100QB engine made by the Yunnan Internal Combustion Engine Limited-Liability Company is established , and the analysis results obtained show that its work-ing performance is generally good except that the air2pass ability and the lubrication effect of the cam and the tappet have to be improved.