Rotary-piston machines or pumps (with non-parallel axes of co-operating members F04C3/00; with the working-chamber walls at least partly resiliently deformable F04C5/00; with fluid ring or the like F04C7/00; rotary-piston pumps specially adapted for elastic fluids F04C18/00; rotary-piston machines or pumps in which the working-fluid is exclusively displaced by, or exclusively displaces, one or more reciprocating pistons F04B)

Child Classifications

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• F04C 2/02 of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
• F04C 2/08 of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
• F04C 2/22 of internal-axis type with equidirectional movement of co-operating members at the points of engagement, or with one of the co-operating members being stationary, the inner member having more teeth or tooth-equivalents than the outer member
• F04C 2/24 of counter-engagement type, i.e. the movement of co-operating members at the points of engagement being in opposite directions
• F04C 2/30 having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members