Patent ID: 8381698

Claim:
A vehicle provided with an engine, the engine, comprising: a) a crank case having a crank chamber housing a crankshaft, and a transmission chamber housing a transmission and including an oil pan in a lower end thereof; b) a single cylinder coupled with the crank case, the cylinder having a center line inclined forward by an inclination angle of 60° or more relative to a vertical direction; c) a cover member attached to one end of the crank case in the crankshaft direction, the cover member having a rotor housing chamber housing a rotor; d) a first oil communication hole or opening formed at a side wall of the crank case between the crank chamber and the rotor housing chamber for providing communication between both the chambers so as to distribute oil; e) a second oil communication hole or opening formed at the side wall of the crank case between the rotor housing chamber and the transmission chamber for providing communication between both the chambers so as to distribute the oil; and f) an oil pump communicating with an oil intake port formed in the oil pan, wherein g) the second oil communication hole or opening is arranged at a position substantially corresponding to a lower end of the rotor housing chamber above the oil intake port where the oil remains in the oil pan when the vehicle is inclined by a predetermined angle substantially corresponding to a complementary angle of the inclination angle of the cylinder relative to a substantially horizontal direction.