MBD Simulation on IC Engine Valve Train

Aim - 1)To model and assemble valve train of IC engine

2)To perform multi body simulation on assembly.

Introduction -

The perpose of valve train is to regulate intake and exhaust by controlling amount of opening of valves.By increasing cam lift performance can be improved by increase in air discharge.

objective of this project to analyse effect of cam lift on valve lift,contact force between cam and push rod,pushrod and rocker arm,rocker arm and valve.

we will analyse following two cases -

Procedure -

1)model all components of valve train

2)assemble by using proper mates.use physical dynamics option to achieve proper contacts.

3)set up motion study and plot the required result.

CASE - 1

Design of cam -

cam lift = L-R1+R2,

cam lift = 3.5,R1 =12.5,R2 =5

L =3.5+12.5-5=11mm

assembly -

physical dynamics setup-

assemble valve train -

motion study setup -

outputs -

1)Valve lift

2)Contact force between cam and pushrod

3)Contact force between pushrod and rocker arm

4)Contact force between rocker arm and valve

simulation -

CASE -2.

Design of cam -

cam lift = L-R1+R2,

cam lift = 6,R1 =12.5,R2 =5

L =6+12.5-5=13.5mm

output -

1) Valve lift

2)Contact force between cam and pushrod

3)Contact force between pushrod and rocker arm

4)Contact force between rocker arm and valve

Simulation -