MBD Simulation on IC Engine Valve Train

Aim : To design a 3D model of IC engine valve train and run MBD simulation on cam lift.

Objectives : 1) Study motion of an IC Enigne valve train

2) Obtain dispolacement curve of valve lift.

3) Obtain contact force between cam and push rod, push rod and rocker arm, rocker arm and valve

Steps :

Design CAD models of each part seperately

Use this formula for design of cam for desired valve lift. Then assemble all components and run motion study.

3D models for individual parts :

Cam :

Rocker Arm :

Push Rod :

Valve :

Valve Stem :

Assembly :

Simulation Results :

1) 3.5mm cam lift :

a) linear displacement of valve lift :

b) Contact force between pushrod and cam :

c) contact force between push rod and rocker arm :

d) contact force between rocker arm and valve :

e) contact force between rocker arm and valve :

2) Cam of 6mm lift :

a) linear displacement of valve :

b) contact force between cam and pushrod :

c) contact force between push rod and rocker arm :

d) contact force between rocker arm and valve :

e)contact force between rocker arm and valve :

Conclusion :

Valve lift and contact force increase as cam lift increases