PROBLEM TO BE SOLVED: To provide a shape of a kinetic pressure groove of a highly precise radial kinetic pressure bearing, which is used as a kinetic pressure groove of a radial kinetic pressure bearing of a centrifugal blood pump and used as an alternative to an existing spiral groove, can be easily machined or stamped in injection molding, and is manufactured while saving a manufacturing cost and time.SOLUTION: A centrifugal blood pump includes a casing equipped with an inflow port and an outflow port, and a vaned wheel for sending a liquid from the inflow port to the outflow port by rotation in the casing. In the pump, a kinetic pressure groove which is a radial kinetic pressure bearing for generating a kinetic pressure between the static shaft of the inner cylinder of the casing and the inner circumference of the rotating vane has a multirobe shape of the rotating surface shape, and the shaft direction shape is such that the groove portion is parallel to the rotating shaft.COPYRIGHT: (C)2014,JPO&INPIT【課題】遠心血液ポンプのラジアル動圧軸受の動圧溝として、従来のらせん溝に代わる、切削加工が容易かあるいは射出成形時の型抜きが容易にでき、製作コストと製作時間を削減しながら高精度のラジアル動圧軸受の動圧溝形状を提供することを目的とする。【解決手段】流入口と流出口が設けられたケーシングと、ケーシング内で回転することによって流入口から流出口へ液体を送る羽根車を備えた遠心血液ポンプにおいて、ケーシング内筒の固定軸と、回転羽根の内周との間に動圧を発生させるラジアル動圧軸受であって、固定軸外周面に形成した動圧溝が、回転面内形状が多円弧形状であり、軸方向形状は溝部分が回転軸と平行であるであることを特徴とする。【選択図】図1
