| 摘要 |
A hydrostatic pad or slipper bearing that is hydrostatically balanced to provide a substantially frictionless bearing with negligible fluid leakage, for supporting a moving part, in which there is a stationary housing in a cylindrical recess in which is mounted a bearing pad movable in the recess and surrounded by a liquid seal, the outward face of the pad being shaped to bear on the moving part to be supported and having a recessed area in its outward face which is defined by sealing land. A passage through the pad provides a communication between the inward face of the pad and the recessed area. Within the housing is a cylindrical cavity containing a valve assembly which is connected in a manner that is free of back lash to the pad so that the valve moves with the pad. The cylindrical cavity is supplied with liquid under pressure the entry of which is controlled by the valve and also with a passage leading to an area of lower of pressure. The novel feature of the construction lies in the fact that the cylindrical recess and the pad are of substantially uniform diameter through the lengths so that the pad is supported against lateral movement by the wall of the recess at a point close to the moving part and in that the effective hydrostatic area of the inward face of the pad is substantially equal to the effective hydrostatic area of the outward face of the pad plus the effective hydrostatic area of the valve subject to the pressure acting on the inward face of the pad, the valve assembly being hydrostatically balanced within itself with respect to the input pressure so that the whole pad and valve assembly are hydrostatically balanced. This arrangement guards against the leading edge of the pad digging into the moving part and also permits the use of a large diameter poppet valve. |
