PRESSURE DAM BEARING

摘要

PROBLEM TO BE SOLVED: To reduce an oil amount led to flow out from the high oil film pressure of a pressure dam to a bearing end, and miniaturize the capacity of a lubricant oil system, in a pressure dam bearing for supporting the high speed rotary shaft of a turbine, a high speed compressor and the like for thermal power generation and a ship propelling prime mover, and for driving a generator, and so on. SOLUTION: A circumferential oil groove 5 for a pressure dam, is arranged in the center of a sliding inner circumferential surface between a bearing upper half part 1 and a rotary shaft in a journal bearing consisting of an upper half part and a lower half part, and a circumferential oil groove 7 is arranged in parallel with the oil groove 5 on the bearing end side of the oil groove 5. One end of the oil groove 5 is formed to be connected to a first oil supply groove 4a, the other end thereof is formed to be brought to a pressure dam 6 (dead-end part), and the oil groove 7 is connected to a second oil supply groove 4b. High oil film pressure generated in the oil groove 5 is enough lowered to atmospheric pressure or groove internal pressure when reached to the oil groove 7, and led to flow into the bearing upper half part 1 again after being joined with oil in the oil supply groove 4b connected to the downstream side of the oil groove 7 while being led to flow from the oil groove 5 into the oil groove 7 and led to flow into a circumferential direction.