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Gas sealing mechanism
To prevent the leakage of gas in the cylinder is the fundamental way to reduce the leakage path as much as possible to increase the leakage resistance. Therefore, one must rely on the piston ring ring ring around the cylinder wall tightly formed the so-called first sealing cover (Fig. 10-43) I, the second depends on the gas ring of a side and the ring groove of a side is closely attached to the formation of the so-called second sealing surface (figure I).
In this case, cylinder gas can only be through the labyrinth of channels and can only be past the piston rings and incision at a area for] d, SW of the small hole to spill (D.] here is the gap between the piston ring bank and cylinder, and SW is piston ring end gap in the cylinder, hot state] D and SW are very small). Because there are 2-3 gas ring on a piston, it means connected with 2-3 orifice. Equivalent passage area is smaller. So you don't have a lot of leakage. If the first sealing surface is not closed, or without the sealing cover (Fig. 10-43 (b), along the piston and cylinder wall of the ring gap leakage, leakage site more the.