| 摘要 |
PURPOSE:To improve durability of seal structure by having an inner seal ring, a collar, and a transmission rotational member attached to a rotational shaft to be rotated unitedly. CONSTITUTION:Outer seal rings 41, 44 are pressed and inserted into shaft holding holes on both edges of a transmission case 47, and inner seal rings 42, 25 are fitted outside of a rotational shaft 18. Between the inner seal ring 42 and a transmission rotational member 19, a collar 40 which rotates unitedly with the rotational shaft 18 is formed, and the inner seal ring 45 is abutted to the transmission rotational member 19, as well. Since the relative rotational contact does not occur in either case of between the collar 40 and the rotational shaft 18, between the collar 40 and the inner seal ring 45, and between the collar 40 and the transmission rotational member 19, the abrasion in respective members is eliminated, thus improving the durability of seal structure. |
