Unformatted text preview: ) in the piston may be
made equal to or slightly less than the axial thickness of the ring (t2).
∴ Width of other ring lands,
b2 = 0.75 t2 to t2
The depth of the ring grooves should be more than the depth of the ring so that the ring does not
take any piston side thrust.
The gap between the free ends of the ring is given by 3.5 t1 to 4 t1. The gap, when the ring is in
the cylinder, should be 0.002 D to 0.004 D. 32.10 Piston Barrel
It is a cylindrical portion of the piston. The maximum thickness (t3) of the piston barrel may be
obtained from the following empirical relation :
t3 = 0.03 D + b + 4.5 mm Internal Combustion Engine Parts n 1137 where b = Radial depth of piston ring groove which is taken as 0.4 mm larger
than the radial thickness of the piston ring (t1)
= t1 + 0.4 mm
Thus, the above relation may be written as
t3 = 0.03 D + t1 + 4.9 mm
The piston wall thickness (t4) towards the open end is decreased and should be taken as 0.25 t3
to 0.35 t3. 32.11 Piston Skirt
The portion of the piston below the ring section is known as piston skirt. In acts as a bearing for
the side thrust of the connecting rod. The le...
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- Spring '11
- Combustion, Internal combustion engine, pistons, Connecting rod, Engine technology, piston pin