Patent ID: 7243631

Claim:
A pull-start engine comprising: a crankcase unit including a crankcase, and a crankshaft journalled within said crankcase, said crankshaft being formed with a lubricant passage; a pull-start unit including an annular base wall spaced apart from said crankcase and having an inner periphery, and a surrounding wall extending axially from said inner periphery of said base wall and sleeved fixedly on an end of said crankshaft, said surrounding wall having an inner wall surface, an outer wall surface, an annular inner slot formed in said inner wall surface, a through hole formed in said outer wall surface and communicated with said inner slot, and two annular flanges extending radially and outwardly from said outer wall surface and flanking said through hole so as to define an annular outer slot between said flanges; a gearbox unit including a gearbox connected fixedly to said crankcase, and a drive shaft journalled within the gearbox and having a lubricant passage; and a lubricating unit including an entrance passage formed in said crankcase and communicated with said outer slot in said pull-start unit, and a connecting passage formed in said crankcase and said gearbox and communicated with said outer slot in said pull-start unit and said lubricant passage in said drive shaft.