Abstract: A lubricated bearing apparatus for a hydraulic machinery has rotary-side ceramic sliding plates disposed in contact with bearing-side ceramic sliding plates. The rotary-side ceramic sliding plates are disposed in receiving grooves of a main shaft sleeve member fixed to the main shaft. The main shaft sleeve member is provided with preventing portions for preventing the rotary-side ceramics sliding plates from being broken by the centrifugal force. Thus, ceramic materials can be used both on the rotary side and the bearing side, thereby lengthening the usable life of the bearing apparatus.

Abstract: An end face mechanical shaft seal for use in a hydraulic machine includes a seal ring assembly detachably secured to a seal casing and having a sealing face which makes a sliding and fluid-tight contact with an annular seat face presented by a flange on the rotor shaft. The seal ring assembly is of a cartridge type which includes a ring casing having an annular groove formed in one end surface thereof and a seal ring partly received in the groove and fixed to the ring casing by an adhesive. Each of the ring casing and the seal ring is constituted by a plurality of arcuate sections or segments which are connected together in the circumferential direction.