| 摘要 |
The butterfly valve of the invention is provided with a valve shaft to which a valve body is mounted, and a pair of slide bearings which rotatably support both ends of the valve shaft. Inner peripheral surfaces of the slide bearings being in contact with the valve shaft are formed in a convex curved surface protruding to an inner peripheral side, and the inner peripheral surfaces of the slide bearings are formed in a circular arc shape in cross section along an axial direction. The inner peripheral surfaces in the slide bearings in both sides being in contact with the valve shaft are formed in a convex curved shape protruding to the inner peripheral side, and the inner peripheral surfaces of the slide bearings are formed in a circular arc shape in cross section along the axial direction. Accordingly, the inner peripheral surfaces of the bearings are in contact with the outer peripheral surface of the valve shaft in a substantially line contact manner. Therefore, even in the case that the valve holder to which both of the slide bearings are mounted are deformed at a time of being manufactured and a displacement is generated at an axial position of the slide bearings at both ends, it is possible to well fit the valve shaft to both of the slide bearings because the bearings in both ends serve to absorb the displacement in the axis.
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