| 摘要 |
<p>PROBLEM TO BE SOLVED: To shorten a manufacturing period and a working term at the site of an upper cover and to reduce the vibration of the upper cover by hydraulic pulsation from a water flowing surface. SOLUTION: An upper bearing 36 and a middle bearing 37 to support an upper spindle 35a of a guide vane 35 are installed on a stay ring 32. A lower bearing 38 to support a lower spindle 35b of the guide wane 35 is installed on a lower cover 34. This structure enables to make a diameter of the outmost circumference of an upper cover 33 to be smaller than diameters of attached pitch circles of each bearing 36, 37, and 38 and the upper cover 33 to be lifted up through an upper pit liner 46 even when it is made to be an integral structure. A thrust bearing support stand to support the thrust load of a rotating part is constructed to be an integral structure with the upper cover 33.</p> |
