| 摘要 |
PROBLEM TO BE SOLVED: To prevent vertical plates for a base plate from being defected in the axial direction without complicating the structure thereof and increasing the weight thereof. SOLUTION: Each of the vertical plates for the base plate, having at least two pads for thrust bearings to constitute thrust bearings, and included in the base plate, comprises: two first vertical ribs which extend in the upward direction perpendicular to the bottom parts of the vertical plates for base plate from the bottom parts thereof along two straight lines extending in the direction perpendicular to the bottom part of the vertical plates for base plate from each of the centers of gravities of the pads for the thrust bearings; two second vertical ribs which extend in the downward direction perpendicular to the bottom parts thereof from the two upper angular parts of the vertical plates for base plate; and two inclined ribs which extend from the top ends of the first vertical ribs to the bottom ends of the second vertical ribs in the obliquely upward outside direction, and are located at the lower positions of the two pads for the thrust bearings.
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