| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To allow slidability to be compatible with reliability between a valve shaft 31 of a first butterfly valve 4 and a valve bearing hole 51 of a first valve bearing member 11, even in the bearing structure composed of components of resin material having relatively low molding precision. <P>SOLUTION: In a bearing support device, a fitting part in which a plurality of fitting protrusions 53 of the first valve bearing member 11 interference-fit in a plurality of fitting recesses 63 of a fitting hole 61 of a bearing holding member 17, is so provided to a valve bearing hole 51 so as to provide a positional relationship where the fitting force by interference fit can act in the direction in which the inner diameter of the valve bearing hole 51 of the first valve bearing member 11 is not affected. Thus, the centering of the fitting hole 61 of the first valve bearing member 11 and the valve bearing part 52 can be performed at the same time when the plurality of fitting protrusions 53 of the first valve bearing member 11 are fitted in the plurality of fitting recesses 63 of the fitting hole 61 of the bearing holding member 17. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
