| 摘要 |
PURPOSE:To suppress vibration and noise by providing oil paths, which are connected continuously to a through-hole, to a tightening plate which is pressed against a yoke. CONSTITUTION:A through-hole 10 is provided to the center of a yoke 5 and a tightening plate 11 are pressed against the yoke 5 at the bottom ends of tightening and connecting members 13 and oil paths 11a are provided to the tightening plate 11 so as to be connected continuously to the through-hole 10. Insulating oil 19 flows smoothly into the through-hole 10 from the bottom forming oil flow 23 as shown by arrows. The tightening and connecting members 13 are cooled uniformly from the bottom to the top so that the loosening of the tightening and connecting members 13 caused by the thermal expansion is eliminated and the increase of vibration and noise is avoided. By cooling the tightening and connecting members 13 uniformly and avoiding local temperature rise and suppressing the expansion of the tightening and connecting members 13, the decline of the tightening force along the axial direction of a main core leg 4 is suppressed so that vibration and noise are suppressed. |
