| 摘要 |
A contact angle (alpha) of a row of tapered rollers (7) on a pinion shaft 1 is set to be 30°, and made larger than a contact angle (beta) of a row of tapered rollers (8) which is 20°. This decreases a distribution of load in a radial direction on the row of the tapered rollers (7), and increases a distribution of load in a radial direction on the row of the tapered rollers (8). In this manner, the load in the radial direction on the row of the tapered rollers (7) and the load in the radial direction on the row of the tapered rollers (8) are made close to each other, so that unbalance of the loads in the radial direction between the two rows of the tapered rollers (7, 8) can be moderated, thus improving the supporting rigidity and the life. |
