STRUCTURE OF OIL SUPPLY HOLE FOR COOLING PISTON, CAPABLE OF PREVENTING LOSS OF OIL FILM OF THE MAIN BEARING BY CONNECTING AN INLET OF AN OIL PASSAGE TO THE OIL HOLE FORMED IN THE CENTER OF A CRANKSHAFT

摘要

PURPOSE: Structure of an oil supply hole for cooling a piston is provided to supply oil to the piston actively, to process the oil hole conveniently, and to prevent loss of oil film of the main bearing by connecting an inlet of an oil passage to the oil hole formed in the center of a crankshaft. CONSTITUTION: A pin part of a crankshaft(1) is combined with an end of a connecting rod connected to a piston(7), and a journal part for supporting a main bearing and a balance weight(4) are formed in the middle of the crankshaft. An oil passage(10) is formed diagonally in the balance weight to supply oil to the lower part of the piston. An inlet(10a) of the oil passage is extended to the journal part, and connected to an oil hole formed in the crankshaft. An outlet(10b) of the oil passage is formed in the upper part of the balance weight for the piston. The oil passage is inclined with 15 to 20 angular degrees.