Crankcase gas separator

A crankcase gas separator for removing contaminants in the form of oil mist and soot particles from a crankcase gas produced during operation of an internal combustion engine, said crankcase gas separator comprising:

• a centrifugal rotor with a plurality of separation discs for separating the contaminants from the crankcase gas, the centrifugal rotor being arranged inside a stationary rotor housing having a gas inlet for conducting crankcase gas to the centrifugal rotor and a gas outlet for discharging the cleaned crankcase gas from the centrifugal rotor;
• an electric motor arranged for rotation of the centrifugal rotor about a rotational axis;
• and
• a gear device arranged between the electric motor and the centrifugal rotor, the gear device having a gear ratio arranged to increase the rotational speed of the centrifugal rotor in relation to the electric motor,
• wherein the gear device comprises a gear housing delimiting a gear chamber, the gear chamber inside the gear housing being arranged to contain oil for lubricating the gear device, and
• wherein the separator is arranged with a channel in the centrifugal rotor for communicating said lubricating oil between the gear chamber inside the gear housing and at least one bearing of the centrifugal rotor.