Sleep Story 194 - Tractor Principles
Bore You To Sleep - Sleep Stories for Adults
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The Principles of Piston Rings
A fitting in a groove around the piston prevents the wrist pin from moving sideways. Lock nuts, lock washes or cotter pins are usually used to prevent trouble that would be caused if the wrist pin worked loose. A leage proof joint between the piston and the cylinder is made by means of piston rings that fit in grooves around the piston. Piston rings are not solid, but are split so that they are elastic. They fit snugly in their grooves and tend to spring open to a greater size than the cylinder. This causes them to maintain a close fit against the cylinder, and the gases are prevented from leaking past. Each cylinder is provided with two valves, the in
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