| 摘要 |
PURPOSE:To decrease a stirring loss of oil, by forming the end surface of a balance weight in its rotary direction to a wedge shape while a bottom part of the end surface to a sharpened part and the end surface to a shape tilting upward from the sharpened part. CONSTITUTION:A balance weight 24 is arranged in the inside of a back pressure chamber 23 and integrally formed with a main shaft 4. The balance weight 24, which comprises an arm part 24d and an overlapping part 24a, forms both end surfaces 24b, 24c of the overlapping part 24a to a wedge shape, and the end surface in the rotary direction is in the wedge shape forming its bottom part 24f to a sharpened part while tilting diagonally upward from said sharpened part. Accordingly, a stirring loss of oil can be reduced by smoothing a flow of the oil around the balance weight 24.
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