Patent ID: 6892716

Claim:
An oil separator for an engine, which is configured to separate a liquid from a gas, comprising: a tubular oil chamber provided with its center axis extending substantially in a vertical direction, the oil chamber having closed upper and lower opening ends; an air-fuel mixture transport pipe connected to a peripheral portion of the oil chamber so as to communicate with an inner space thereof, the air-fuel mixture transport pipe being configured to transport a liquid air-fuel mixture into the oil chamber; a gas discharge pipe connected to an upper end portion of the oil chamber so as to communicate with the inner space thereof, to allow the gas to be discharged from the oil chamber through the gas discharge pipe, a liquid discharge pipe connected to a lower end portion of the oil chamber so as to communicate with the inner space thereof, to allow the liquid to be discharged from the oil chamber through the liquid discharge pipe; and a separating member provided in the inner space within the oil chamber to define a first space on an upper side and a second space on a lower side; wherein the separating member is provided with a penetrating hole to allow the first space and the second space to communicate with each other, an upper end portion of a pipe member is connected to a lower face of the separating member so as to communicate with the penetrating hole, and a lower end portion of the pipe member opens downwardly; wherein a connecting end portion of the gas discharge pipe protrudes into the first space and opens downwardly within the oil chamber; and wherein a connecting end portion of the air-fuel mixture transport pipe is placed in the vicinity of an inner peripheral face of the oil chamber and located higher than the lower end portion of the pipe member such that the connecting end portion communicates with the second space of the oil chamber and opens in a circumferential direction of the oil chamber.