with the pumping cylinder situated between working cylinder and crankcase, or with the pumping cylinder surrounding working cylinder

Full Title

Engines characterised by provision of pumps for charging or scavenging > Engines with reciprocating-piston pumps; Engines with crankcase pumps > with reciprocating-piston pumps other than simple crankcase pumps > with the pumping cylinder situated between working cylinder and crankcase, or with the pumping cylinder surrounding working cylinder

Child Classifications

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• F02B 33/12 the rear face of working piston acting as pumping member and co-operating with a pumping chamber isolated from crankcase, the connecting-rod passing through the chamber and co-operating with movable isolating member
• F02B 33/14 working and pumping pistons forming stepped piston
• F02B 33/16 working and pumping pistons having differing movements