Oil separating device for a combustion engine

An oil separating device for an internal combustion engine connected in a flow path of blow-by gas, loaded with oil particles, from the crankcase to the suction manifold section of the internal combustion engine and comprising an oil separator formed with at least one constricted passage through which the flow of oil-bearing blow-by gas is guided and deflected, the oil particles being separated at a wall which causes them to flow back to the crankcase in an oil return path, wherein the at least one passage is formed by a slot having a variable slot width and large cross sectional slot area, the slot width being varied against spring force applied by at least one resilient tongue the flat side of which is exposed to the gas flow transversely of its longitudinal extension, uncovering a slot for passage of the blow-by gas flow in response to the magnitude of the volume flow which depends on the operating point of the internal combustion engine, wherein at least one baffle associated with the at least one resilient tongue member is provided downstream of the passage in the direction of flow to separate the oil particles, wherein the baffle forms a border strip located at a periphery of the at least one passage and having at least one protrusion against which the at least one resilient tongue, when in the state of not being subjected to the gas flow, abuts in sealing contact wherein the at least one baffle comprises a bent portion.