Rotary joint principle for high pressure and high relative speed

A rotary joint for transferring a pressurized working fluid from a stationary machine part to a rotating machine part or vice versa, having a housing belonging to the stationary machine part, a shaft belonging to the rotating machine part, and at least one bushing mounted in the housing, the bushing is hermetically-mounted on the shaft and hermetically-mounted in the housing, and the bushing can be moved radially and flexibly. The inner surface of the bushing and the datum surface of the shaft have a sealing surface with relative sliding, and the rotary joint bushing has at least three holes connected with the radial hole of at least one shaft by annular grooves on the datum surface of the shaft and the inner surface of the bushing so as to transfer the pressurized workpiece fluid through the bushing into a fluid guide groove extending axially into the shaft, which is connected with the radial hole of the shaft.