Patent ID: 6199532
Filing Date: 2001-03-13
Classification: F01M,F02B

Abstract:
An oil-in-fuel lubricated four-stroke engine comprising:a cylinder;a piston movably mounted in said cylinder;said cylinder and said piston conjointly delimiting a combustion chamber;said cylinder having an intake opening and an intake valve for opening and closing said intake opening;said cylinder having an exhaust opening and an exhaust valve for opening and closing said exhaust opening;a valve housing connected to said cylinder;said intake valve and said exhaust valve movably mounted in said valve housing;a crankcase connected to said cylinder and communicating with said valve housing;a crankshaft rotatably journalled in said crankcase;a connecting rod interconnecting said piston and said crankshaft;said piston reciprocating in said cylinder to rotatingly drive said crankshaft via said connecting rod and alternately generate an overpressure and an underpressure in said crankcase;a valve drive assembly driven by said crankshaft for actuating said intake valve and said exhaust valve;a mixture-preparation device for supplying an air/fuel-lubricant mixture;an intake channel conducting said mixture to said intake valve;a connecting channel connecting said valve housing to said intake channel; and,said crankcase communicating with said mixture-preparation device exclusively via said valve housing, said connecting channel and said intake channel to facilitate movement of at least a portion of said mixture between said crankcase and said intake channel via said valve housing in response to said overpressure and said underpressure.