OIL SEPARATION DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

To improve the oil separation performance in an oil separation device for an internal combustion engine. The oil separation device (10) comprises a gas liquid separation passage (56) internally defined by a lower wall, an upper wall and a pair of side walls, and extending in a horizontal direction, a gas inlet (54) and a gas outlet (63) provided on either end of the gas liquid separation passage, a plurality of lower partition walls (56H) projecting upward from the lower wall, and a plurality of upper partition walls (56J) projecting downward from the upper wall. The lower partition walls and the upper partition wall are tilted with respective the length wise direction in plan view so as to define a spiral passage. The lower wall is inclined with respect to a horizontal plane such that an upstream part of the lower wall is lower than a downstream part of the lower wall with respect to a direction of the swirl flow.

主权项

1. An oil separation device for an internal combustion engine, comprising:
a gas liquid separation passage internally defined by a passage forming member including a lower wall, an upper wall and a pair of side walls, and extending in a horizontal direction; a gas inlet provided on one end of the gas liquid separation passage and a gas outlet provided on another end of the gas liquid separation passage; a plurality of lower partition walls projecting upward from the lower wall and disposed in parallel to one another; and a plurality of upper partition walls projecting downward from the upper wall and disposed in parallel to one another; wherein each lower partition wall extends in a first direction which is tilted with respect to a lengthwise direction of the gas liquid separation passage in plan view, and each upper partition wall extends in a second direction crossing the first direction so that a spiral passage extending in the lengthwise direction of the gas liquid separation passage is defined by the lower partition walls and the upper partition walls; and wherein the spiral passage with a certain turn is defined by the lower partition walls and the upper partition walls for causing a swirl flow as gas flows from the gas inlet to the gas outlet, and the lower wall is inclined with respect to a horizontal plane such that an upstream part of the lower wall is lower than a downstream part of the lower wall when viewed in a direction of the swirl flow.