Patent ID: 8991365
Filing Date: 2015-03-31
Classification: F01M

Abstract:
1. A blowby gas returning apparatus for engine with supercharger, provided in an engine including a supercharger in an intake passage and a throttle valve in the intake passage downstream of the supercharger, to allow blowby gas generated in the engine to flow to the intake passage to return to the engine, the blowby gas returning apparatus comprising: a bypass passage that connects an upstream side and a downstream side of the supercharger in the intake passage; an ejector for generating a negative pressure in the bypass passage; a first blowby gas returning passage for allowing the blowby gas to flow to the intake passage during operation of the supercharger, the first blowby gas returning passage including an outlet connected to the bypass passage through the ejector; and a second blowby gas returning passage for allowing the blowby gas to flow to the intake passage during non-operation of the supercharger, the second blowby gas returning passage including an outlet connected to the intake passage downstream of the throttle valve, the engine including a head cover and a crank case for accumulating the blowby gas, wherein an inlet of the first blowby gas returning passage and an inlet of the second blowby gas returning passage are both connected to the head cover at distinct locations on the head cover and are located adjacent to each other, and the blowby gas returning apparatus further includes a backflow preventing unit placed in the first blowby gas returning passage to prevent a flow of air in a direction opposite to a direction of allowing the blowby gas to flow.