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Difficulty: EasyEngine Principles and Internal Components

In an internal combustion engine, the energy generated during combustion travels through several internal components to create rotational power. Place the following components and mechanical events in the correct order of force transfer during the power stroke, from first to last.

  1. 1Expanding combustion gases push directly downward against the top of the piston crown.
  2. 2The wrist pin transmits the downward thrust from the piston body to the upper end of the connecting rod.
  3. 3The connecting rod carries the linear thrust downward toward the crankshaft.
  4. 4The crankshaft journal receives the downward force and converts the reciprocating motion into rotational torque.

Answer

Expanding combustion gases push against the piston crown, the wrist pin transfers force to the connecting rod, the connecting rod carries the thrust downward, and the crankshaft converts the linear force into rotational motion.
During the power stroke, expanding combustion pressure exerts force on the piston crown. This downward force passes through the wrist pin to the connecting rod, which in turn pushes against the crankshaft journal to produce rotational torque.

Step-by-Step Solution

1
Identify the initial source of mechanical thrust in the cylinder.
Combustion pressure acts first on the piston crown.
Igniting air-fuel mixture creates rapid expansion in the cylinder, exerting immediate pressure on the movable piston face.
2
Trace the force through the pivot inside the piston.
The wrist pin receives the downward thrust from the piston.
The wrist pin passes through the piston skirt and holds the small end of the connecting rod.
3
Follow the mechanical path through the connecting rod.
The connecting rod pushes down on the crankshaft journal.
The beam of the connecting rod transfers linear motion from the wrist pin down toward the lower engine block.
4
Determine the final motion conversion at the bottom of the stroke.
The crankshaft converts the downward force into rotary power.
The offset throw of the crankshaft translates reciprocating linear travel into rotary torque.

Key Concept

Force transmission and motion conversion through internal engine components
Estimated Time:45s
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Topics

Engine Principles and Internal Components

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