Machines or engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders (in opposite arrangement relative to main shaft F01B1/08)

Child Classifications

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• F01B 7/02 with oppositely reciprocating pistons
• F01B 7/16 with pistons synchronously moving in tandem arrangement
• F01B 7/18 with differential piston (F01B7/20 takes precedence)
• F01B 7/20 with two or more pistons reciprocating one within another, e.g. one piston forming cylinder of the other