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MAHINDRA 2 WHEELERS MAHINDRA 2 WHEELERS
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
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GT Model:
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Methodology
Valve Train Dynamic Model
Valve Train Geometry
Engine Operating Condition
Valve Profiles
Input Dynamic Results
1D Analysis
FEA
Durability Analysis
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GT Model: 2D Schematic Diagram
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Intake Valve Dynamic Motion at Higher RPM
Exhaust Valve Dynamic Motion at Higher RPM
Valve Bouncing is seen
at higher RPM.
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Effect of RPM on Intake Valve Dynamics
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Effect of RPM on Exhaust Valve Dynamics
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Cam Lobes Forces @ 9000 RPM
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Contact Forces @ 9000 RPM
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Intake Rocker @ 9000 RPM
Exhaust Rocker @ 9000 RPM
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FE Analysis:
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FE Analysis:
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Spring Outputs
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Hertz Pressures @ Cam Lobe Interfaces
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Hertz Deformation @ Cam Lobe Interfaces
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Hertz Deformation @ Valve Stem Tip Interfaces
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Bearing Reaction Force
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Effect of RPM on Cam Bearing Reaction and Rocker
Pivot Forces
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Crank Torque
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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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