| 摘要 |
PURPOSE:To prevent overflow of grease in hollow section due to inner pressure rise caused through temperature rise by communicating the hollow section comprised of a rotary shaft, a pulley assembly and a bearing to the outer air. CONSTITUTION:A tubular shaft 15 fixed with a fixed pulley 16a is supported by drive shaft 13 through bearings 12, 12. A hollow section 27 is formed with said tubular shaft 15, bearings 12, 12 and the drive shaft 13. The drive shaft 13 is provided with holes 33, 34 and a groove 35. The hollow section 27 is communicate to the atmosphere through said holes 33, 34 and groove 35. Even upon inner pressure rise due to the temperature rise caused through communication with the atmosphere, the pressure can be released to the atmosphere. |
