High pressure - rotary by means of guidance for a in a hub which debuted and in its rotatably supported shaft

摘要

A rotary fluid coupling for conveying fluid from a stationary shaft to a hub rotatably mounted on the shaft, or vice versa. The coupling is characterized in having an annular piston which surrounds the shaft and which forms a wall of a chamber connecting a duct in the shaft to a duct in the wall of the hub. A seal is disposed around the shaft between the piston and a closed end of a bore in the hub. In the bore between the piston and the seal is a lubricating material such that pressure exerted on the piston by fluid in the aforesaid chamber will be transmitted by the lubricating material to the seal, preferably a labyrinth seal.