| 摘要 |
PROBLEM TO BE SOLVED: To improve a piston cooling system for an internal combustion engine of a type wherein each injection nozzle extended from a lubricating hole assembled inside a forcible-feed lubricating device is directed downwards inside a crank casing, and wherein the injection nozzles are alignedly assembled in the crank casing, so as to efficiently carry out manufacturing and assembling for the injection nozzles. SOLUTION: The each injection nozzle 4 is constituted as a compact rotary portion, the injection nozzles 4 are inserted alignedly inside a longitudinal- directional hole 5 by a tool, the hole 5 is extended to penetrate a partitioning wall 6 arranged between cylinder chambers coaxially and in parallel to a crank shaft, and the each injection nozzle 4 is connected to the forcible-feed lubricating device via a hole 7 inside the partioning wall 6.
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