29-09-2015 1 ME 311: Dynamics of Machines and Mechanisms Lecture 22: Engine Dynamics: Part 4 By Suril Shah Mechanical Department IIT Jodhpur 1 Outline • Pin Forces • Balancing the Single-cylinder Engine • Design Trade-offs And Ratios 2 Simplified Kinematics 3 Gas Torque 4 5 Approximate Model Approximate Model 6
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
29-09-2015
1
ME 311: Dynamics of Machines and
Mechanisms
Lecture 22: Engine Dynamics: Part 4
By
Suril Shah
Mechanical Department
IIT Jodhpur
1
Outline
• Pin Forces
• Balancing the Single-cylinder Engine
• Design Trade-offs And Ratios
2
Simplified Kinematics
3
Gas Torque
4
5
Approximate Model
Approximate Model
6
29-09-2015
2
Inertia Force
7
Shaking Force
8
Inertia and
Shaking Torques
9
Total torque
10
Flywheel (3400 rpm)
11
Pin Forces in the
Single-cylinder
Engine
• Design of the pins and the bearings at the joints
• We will calculate the effect of
– Gas force (Fg)
– Inertia force due to the piston mass (Fip)
– Inertia force due to the mass of the conrod at the wrist pin (Fiw)
– Inertia force due to the mass of the conrod at the crank pin (Fic)
– Inertia force due to the mass of the crank at the crank pin (Fir)
• Superpose them to obtain the complete pin force at each joint.