Patent ID: 7143735

Claim:
In an internal combustion engine comprising a crankcase, a crankshaft support bearing mounted in the crankcase, and a crankshaft which rotates in the bearing, said engine adapted to lubricate said bearing via splashing oil in said crankcase, the improvement comprising: an oil-directing wall structure comprising a plurality of ribs formed on a wall surface of a bearing support wall of said crankcase, for collecting oil which is splashed onto and flows down the wall surface, said ribs disposed substantially radially relative to said bearing and situated proximate an upper half of the bearing, a central through hole formed in said bearing support wall for receiving a crankshaft support bearing therein, and wherein said ribs are oriented to direct oil flowing down said wall surface toward said central through hole, and a raised lower lip formed on the support wall at an edge of said central through hole below said guide ribs, said raised lower lip having a slanted upper surface which is inclined inwardly and downwardly towards the bearing.