Vertical engine

A vertical engine having a crankshaft directed in a vertical direction and a flywheel provided on a lower end of the crankshaft projected through a bottom wall of a crank chamber comprising:

• a flywheel compartment formed under said bottom wall of the crank chamber for housing said flywheel;
• an oil pan provided under said flywheel compartment and containing oil for lubricating said crankshaft, at least a part of said oil pan being positioned at a side opposite to said crank chamber with respect to said flywheel compartment;
• an oil return passage for returning said oil from said crank chamber to said oil pan detouring around said flywheel compartment;
• a skirt section provided integrally with a cylinder block;
• a split crankcase attached to said skirt section putting respective contacting faces together to form said crank chamber;
• a bearing wall section provided on said cylinder block side and forming a lowest crank bearing section within said crank chamber;
• and
• an oil dropping hole provided in said bearing wall section and communicating with a lower side of said bearing wall section and an upper side of said bearing wall section positioned within a lowest cylinder, said oil dropping hole being inclined downward from said cylinder side to said contacting face of said skirt section facing to said split crankcase.

A vertical engine comprising:

• a crank chamber;
• a crankshaft enclosed by said crank chamber, said crankshaft having a vertically directed axis of rotation and a lower end projecting from a bottom wall of said crank chamber;
• a flywheel disposed externally of the bottom wall of said crank chamber and coaxially connected to said crankshaft lower end;
• a flywheel compartment formed under said crank chamber bottom wall and housing said flywheel,
• a drive shaft having a vertically disposed axis coaxially connected to said flywheel and extending from said flywheel compartment;
• an oil pan containing oil for lubricating said crankshaft disposed beneath, and separate from, said crank chamber and said flywheel compartment, and being laterally displaced from said drive shaft;
• and
• an oil return passage for returning oil from said crank chamber to said oil pan extending around said flywheel compartment.