US 4,122,818 AGranted

Oil circulating and cooling system

AssigneeToyota Jidosha Kogyo Kabushiki Kaisha

InventorKyo Hattori

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Abstract

An oil circulating and cooling system for an internal combustion engine having an oil pump to pump the oil under pressure throughout the oil distribution system of the internal combustion engine and an oil pressure regulation circuit in parallel with the oil distribution system of the internal combustion engine. The oil pressure regulation circuit comprises a relief valve for diverting a portion of the oil from the oil pump to the oil pressure regulation circuit thereby setting the maximum value of the oil pressure throughout the oil distribution system of the internal combustion engine and an oil cooler for cooling the oil which has been diverted to the oil pressure regulation circuit. Since the oil temperature and oil pressure at the output of the oil pump increase with increased engine rpm, the oil is only cooled when the engine rpm is high.

Claims7

Dependent claims

An oil circulating and cooling system for an internal combustion engine of the type having an oil pan and an oil distribution system comprising:

an oil pump to pump oil under pressure throughout the oil distribution system of said internal combustion engine;
a valve means coupled to the output of said oil pump for diverting a portion of said oil from said oil pump when the oil pressure from said oil pump is some predetermined value;
a half arc chain seat for a crank timing gear to hold said diverted oil from said valve means, said half arc seat and said valve means arranged and configured such that said diverted oil is applied directly to the crank timing gear to said half arc seat, and to said timing chain whereby as the timing chain revolves the diverted oil from said valve means is thrown from said timing chain and flows down the cam shaft cover, the cylinder head, and the timing chain cover and returns to the oil pan thereby cooling the oil.

Dependencies are inferred from the claim text.