| 摘要 |
PROBLEM TO BE SOLVED: To reduce the size of a constitution which receives a thrust force by bringing a first throttle and a second throttle functioning for receiving the thrust force into a cross arrangement relationship.SOLUTION: A grindstone 102 is supported to a thrust direction by the bearing oil of a thrust bearing metal 104. A first throttle 92 and a second throttle 94 which limit circulation from a fluid pocket part 96 are arranged in a right angle direction. The fluid pocket part 96 is formed while straddling a boundary part between a first formation face 70 and a second formation face 75 of the first throttle 92 and the second throttle 94 which are arranged in the right angle direction. A circulation direction of the first throttle 92 is set as a right angle with respect to an axial direction of a grindstone 102, and its throttle is throttled by the movement of the grindstone 102 to a thrust operation direction. By this constitution, since a length of the grindstone 102 in an axial right angle is influenced by the first throttle 92 and the fluid pocket part 96, the size of a device can be reduced.SELECTED DRAWING: Figure 4 |
