Patent ID: 7240657

Claim:
A lubricating system of an engine in which plural cylinders are provided so as to be arranged in a direction of a crank shaft, an oil pan is mounted to an oil pan mounting portion formed in a lower surface of a crank case, and a whole of a crank chamber in the crank case is partitioned into plural individual crank chambers by a partition wall so as to correspond to the cylinders in which the crank chamber has a bottom wall to isolate the crank chamber from the oil pan, comprising: an oil drain port formed in the bottom wall of each of the individual crank chambers respectively; a scavenging oil pump pumping out oil to an oil reservoir portion which is isolated from each of the individual crank chambers; and an oil collecting chamber communicating with a suction portion of the scavenging oil pump, wherein the oil collecting chamber is positioned under the bottom wall of the crank chamber, and the oil drain ports are communicated with the oil collecting chamber.