METHOD FOR MACHINING THE CONNECTING ROD PASSAGE IN A CRANK CASE UPPER HALF, CRANK CASE UPPER HALF AND ENGINE OBTAINED USING THE METHOD

摘要

Method for machining the passage for the connecting rod (3) in an internal combustion engine crank case upper half, consisting in producing, at the base of the cylinder barrel (6), a straight cut (14) of cylindrical shape capable of allowing the connecting rod (3) a lateral excursion as the piston moves up and down in the cylinder, using a rotary milling tool (13) which is plunge-operated from underneath the cylinder, characterized in that the direction of plunging of the milling tool (13) is oriented at an oblique angle to the axis of the cylinder.