| 摘要 |
PROBLEM TO BE SOLVED: To supply clean oil to a bearing supporting the rotary shaft of a transmission without the need of a special filter.SOLUTION: If it is assumed that radius of an outer circumference of a nut 48 is R1, radius of an inner circumference of a washer 47 below a rotary shaft 16 is R2, radius of an inner circumference of an outer ring 35a is R3, and radius of a bottom of a concave portion 43 facing the washer 47 below the rotary shaft 16 is R4, R2<R3 and R2<R4 are satisfied. Therefore, an oil reservoir 51 is formed at the bottom of the concave portion 43 while the washer 47 disposed between the concave portion 43 and the bearing 35 acts as a dam, and foreign matters contained in the lubricating oil can be captured in the oil reservoir 51 and prevented from being supplied to the bearing 35. Furthermore, since R1<R2 is satisfied, it is possible to prevent the foreign matters precipitated at a bottom of the oil reservoir 51 from being agitated by the rotating nut 48 and supplied to the bearing 35 by preventing the excessive entry of an outer circumferential surface of the nut 48 into the oil reservoir 51. |
