| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a gear box stably usable for a long period by preventing the pressure in the gear box body from rising to prevent a grease from flowing out of the gear box for preventing gears from being worn and seized. <P>SOLUTION: This gear box 23 comprises a driving bevel gear 34 secured to a drive shaft 21, a driven bevel gear 37 meshed with the driving bevel gear 34 and secured to an output shaft 38, the box body 30 for containing the driving bevel gear 34 and the driven bevel gear 37, a first rolling bearing 33 rotatably supporting the driving bevel gear 34, and second and third rolling bearings 35, 36 rotatably supporting both ends of the output shaft 38. The first rolling bearing 33 is an opening bearing without a seal. <P>COPYRIGHT: (C)2008,JPO&INPIT |
