Patent ID: 6532912
Filing Date: 2003-03-18
Classification: F01P

Abstract:
A piston cooling system for an internal combustion engine having a crankshaft, a plurality of pistons connected to the crankcase shaft, and a crankcase housing partitioned by a plurality of partition walls into a plurality of partitioned sections, and a pressurized lubrication fluid circuit integrated with the crankcase housing for the circulation of lubricant therethrough and including a plurality of longitudinal bores each extending through a respective one of the partition walls of the crankcase housing generally coaxially with one another and generally parallel to the crankshaft, the piston cooling system comprising:a plurality of bores each formed in a respective partition wall and communicated with the pressurized lubricant fluid circuit; and a plurality of spray nozzles, each spray nozzle being mounted in a respective longitudinal bore and oriented for spraying lubricant onto the underside of a piston and being communicated with a respective bore such that each spray nozzle is fluidly communicated with the pressurized lubricant fluid circuit wherein each spray nozzle is formed by a lathe process and has a cross bore having a pair of opposed open ends, a pair of stop pieces each disposed in a respective open end of the cross bore, an inlet bore communicated with the cross bore, and a pair of spray holes disposed generally symmetrically from the axial midpoint of the cross bore, whereby the lubricant fluid flows through the inlet bore, thereafter into the closed off cross bore, and is sprayed out of the spray holes and the inlet bore is aligned for fluid communication with the bore of the respective partition wall in which the spray nozzle is mounted.