| 摘要 |
TO PREVENT OIL IN AN ENGINE COMPRISING A BAFFLE PLATE COVERING A LOWER OPENING (3) OF A CRANKCASE FROM ROTATING UNNECESSARILY IN A CRANK CHAMBER (2) ALONG WITH A CRANKSHAFT, AND TO PREVENT UNNECESSARY POWER LOSS IN THE ENGINE. AN ENGINE (I) COMPRISES A CRANKCASE (4) HAVING A LOWER OPENING (3), A CRANKSHAFT (6) SUPPORTED ON THE CRANKCASE (4) AND CAPABLE OF MAKING A ROTATION (R) AROUND A SHAFT CENTER (5) EXTENDING APPROXIMATELY HORIZONTALLY, AND A BAFFLE PLATE (18) FOR COVERING THE LOWER OPENING (3). A COMMUNICATION PASSAGE (25) FOR COMMUNICATING A CRANK CHAMBER (2) AND A SPACE BELOW IS FORMED BETWEEN AN OPENING EDGE (21) OF THE LOWER OPENING (3) AND AN OUTER PERIPHERY (22) OF THE BAFFLE PLATE (18). A LINEAR PROTRUSION (26) IS DISPOSED EXTENDING APPROXIMATELY IN PARALLEL WITH THE CRANKSHAFT (6) AND PROTRUDING UPWARD FROM THE BAFFLE PLATE (18). ASSUMING THAT A REGION ALONG THE LOWER OPENING (3) IS IN THE FRONT (FR) PART IN THE DIRECTION OF THE ROTATION (R) OF THE CRANKSHAFT (6), THE LINEAR PROTRUSION (26) IS FITTED INTO THE REAR PART OF THE LOWER OPENING (3). (FIGURE 1)
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