Cooling system for lubricating oil in an internal combustion engine

In an internal combustion engine of the type having

• a crankshaft,
• a camshaft arranged above the crankshaft,
• at least one timing chain connecting a first timing pulley secured on said crankshaft to a second timing pulley secured on said camshaft,
• an oil pump for circulation of lubricating oil, said pump being driven by said crankshaft, and
• a pressure-regulating valve for control of the pressure in said system, said valve having one passageway means for diverting a part of said lubricating oil therethrough from said oil pump to an oil pan located at the bottom of said engine when the pressure in the system exceeds a predetermined value, the improvement comprising:
• a cooling system for the lubricating oil in which said other passageway means extends to a position facing the upwardly moving part of said timing chain for directing said part of said lubricating oil onto said chain to be dispersed into fine particles by the centrifugal force exerted by said rotating second timing pulley said fine particles being cooled as they fall downwardly into said oil pan.