of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member

Rotary-piston machines or engines > of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing > of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member

Rotary-piston machines or engines (with axes of co-operating members non parallel F01C3/00; with the working-chamber walls at least partly resiliently deformable F01C5/00; with fluid ring or the like F01C7/00; rotary-piston machines or engines in which the working fluid is exclusively displaced by, or exclusively displaces, one or more reciprocating pistons F01B13/00) > of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing > of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member