Centrifugal separator

In a disposable centrifugal separator for separating contaminants from oil used for lubricating an engine, said separator comprising shroud means defining a first chamber, bearing means within the shroud means, a hollow rotor rotatably carried by the bearing means, said hollow rotor defining a second chamber for receiving contaminated oil, inlet port means in said shroud means said port means being aligned with said bearing means and adapted to form a releasable connection with said engine, an inlet passage passing through said bearing means and connecting said inlet port means to said second chamber, means to rotate said rotor and thereby cause contaminants in the contaminated oil within said second chamber to migrate towards the sidewall of said second chamber under the influence of centrifugal force and to be separated from such contaminated oil, said means to rotate said rotor comprising outlet reaction port means on said rotor in fluid communication with said second chamber to cause said rotor to rotate upon discharge of fluid from said second chamber to said first chamber, partition means in said second chamber adjacent said outlet port reaction means dividing said second chamber into a centrifuging chamber and an outlet port chamber, said centrifuging chamber and said outlet port chamber being interconnected adjacent the rotary axis of the rotor, and outlet port means in said shroud means for discharging fluid from said first chamber, said outlet port means being adapted to form a releasable connection with said engine, the improvement which comprises forming said bearing means as axially aligned stub axles and leaving said centrifuging chamber substantially unrestricted whereby oil entering said centrifuging chamber through said inlet passage immediately flows outwardly towards said sidewall under centrifugal force.