Piston Pt.2
Table of contents for Piston
- Pistons
- Piston Pt.2
This section examines a piston the piston with its connecting rod and bearing transfers the force of the combustion and expansion of the power stroke to the crank shaft. The piston itself, its rings, and the piston o gagen pin are together called the piston assembly.
The cut away shape on this piston allows it to clear the counter weight on this rotating crank shaft. The shape of the piston crown depends on the shape of its combustion chamber and its compression ratio. The piston crown may be flat, concave, dome, or recessed. In diesel engines the combustion chamber may be formed totally or impart in the piston crown depending upon the method of injection so they use pistons with different shape. The piston must stand up you great heat and pressure. it must also change direction from about 10 times a second up to 100 times a second.
In most engines the weight of the pistons is most important engine balance this is why pistons should only be replaced in matched sets. Some pistons are forged while others are cast aluminum alloy. All pistons expand like heat up. As there is o gangen pin this area tends to expand the most.
To allow for this many pistons in the machine into a slightly oval shape this is called cam grinding. Then as the piston heats up and expands it becomes round. Other methods to control expansion include steel straps o ribs, expansion slots in the skirts, or slots called heat dams, with restrict movement of the heat.
In case you didn’t see the video in part 1 of this series… here it is again.
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