| 摘要 |
PROBLEM TO BE SOLVED: To reduce the size of a crank case, in an internal combustion engine in which a crank chamber housing a crank web of a crank shaft is formed in the crank case, and which is disposed in the crank case so that a reed valve opened/closed by pressure fluctuation in the crank chamber discharges oil in the crank chamber in valve opening.SOLUTION: An oil discharge port 88 capable of being closed by a reed valve 85 is provided in a crank case 14 so that in a side surface view from a direction along an axial direction of a crank shaft, at least a part of the oil discharge port is arranged inside the radial direction of a rotation locus C on the outer periphery of a crank web.SELECTED DRAWING: Figure 5 |
