Dynamic Analysis of Valve Train Single Cylinder IC Engine

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Dynamic Analysis of Valve Train of a

Single Cylinder IC Engine

Vikas K. Agarwal

Research & Development, Mahindra Two Wheelers Ltd.

Gamma Technologies User’s Conference, 23rd September

2013

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GT Vtrain Modeling

Valve Train Assembly CAD Model

Challenge: To simulate High RPM Dynamics


GT Model:


Methodology

Valve Train Dynamic Model

Valve Train Geometry

Engine Operating Condition

Valve Profiles

Input Dynamic Results

1D Analysis

FEA

Durability Analysis


GT Model: 2D Schematic Diagram


Intake Valve Dynamic Motion at Higher RPM

Exhaust Valve Dynamic Motion at Higher RPM

Valve Bouncing is seen

at higher RPM.


Effect of RPM on Intake Valve Dynamics


Effect of RPM on Exhaust Valve Dynamics


Cam Lobes Forces @ 9000 RPM


Contact Forces @ 9000 RPM


Intake Rocker @ 9000 RPM

Exhaust Rocker @ 9000 RPM


FE Analysis:


FE Analysis:


Spring Outputs


Hertz Pressures @ Cam Lobe Interfaces


Hertz Deformation @ Cam Lobe Interfaces


Hertz Deformation @ Valve Stem Tip Interfaces


Bearing Reaction Force


Effect of RPM on Cam Bearing Reaction and Rocker

Pivot Forces


Crank Torque


Conclusion:

1. GT enables to do dynamic simulations of the valve train design and

consequently helps to check the High RPM dynamics for

• Spring design / factor of safety

• Dynamic Valve Lifts

• Contact Stress at Lobe & Stem Tip

• Acceleration, Jerks & Forces

• Frictional Power Loss

• Crank Torque required

2. Load cycles at each of the component forms the input for further

FE/Fatigue Analysis.

3. Further, GT VT Kinematic helps in profile generations and forms an

essential input in the performance optimization using GT Power.

4. Therefore, GT Valve Train Dynamic Simulation helps immensely to

optimize the valve train design in the initial design stage.

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Documents

Dynamic Analysis of Valve Train Single Cylinder IC Engine