Contra-rotating bearing device for contra-rotating propeller

摘要

A contra-rotating bearing device (T9) for a contra-rotating propeller comprises an outer shaft (1) having a front propeller, an inner shaft (2,23) which is fitted in the outer shaft (1), rotates in the direction opposite to the outer shaft (1) and has a rear propeller. A contra-rotating bearing is provided between the inner shaft (2,23) and the outer shaft (1). An oil feed port (28) is provided by forming a hollow portion on the inner shaft (2,23), and a plurality of radial oil feed holes (29) which are connected with the oil feed port (28) are formed. Lubrication oil which generates a static pressure load carrying capacity is fed from the inner shaft (2,23) to the inner peripheral face of the bearing (26) through the oil feed port (28) and the radial oil feed holes (29), a plurality of concavo-convex shaped portions (42) which generate a dynamic pressure load carrying capacity are formed on the inner peripheral face of the bearing (26) in the axial direction of the bearing, and circular portions (41B,41F) are provided on both ends of the concavo-convex shaped portions (42) provided in the axial direction of the bearing.