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skirt should be provided to distribute the side thrust from the connecting rod and thus to prevent distortion of the
skirt. The thickness of the ribs may be takes as tH / 3 to tH / 2.
3. For engines having length of stroke to cylinder bore (L / D) ratio upto 1.5, a cup is provided in the top
of the piston head with a radius equal to 0.7 D. This is done to provide a space for combustion chamber. 32.9 Piston Rings
The piston rings are used to impart the necessary radial pressure to maintain the seal between
the piston and the cylinder bore. These are usually made of grey cast iron or alloy cast iron because of
their good wearing properties and also they retain spring characteristics even at high temperatures.
The piston rings are of the following two types :
1. Compression rings or pressure rings, and
2. Oil control rings or oil scraper.
The compression rings or pressure rings are inserted in the grooves at the top portion of the
piston and may be three to seven in number. These ri...
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This note was uploaded on 09/30/2012 for the course MECHANICAL 403 taught by Professor A.thirumoorthy during the Spring '11 term at Anna University Chennai - Regional Office, Coimbatore.
- Spring '11