| 摘要 |
PURPOSE:To prevent a seal ring and a cylindrical bush from wearing by providing a lubrication oil hole in the clearance formed by a cylindrical rotary body, a rotary supporting section, a seal ring, and the cylindrical bush and also by providing spiral groove on the cylindrical bush. CONSTITUTION:Between a cylindrical rotary body 1 and thin cylindrical section 8E, a cylindrical bush 9 on which a groove 9A for feeding out lubrication oil backward is formed is provided. And a clearance B is formed by the inner circumference of the cylindrical rotary body, the outer circumference of a rotary supporting section 2, the rear face of a step 8D, a backward seal ring 5B, and the front face of the cylindrical bush 9. The clearance B is provided with the lubrication oil hole connected with a lubrication oil supply path 3C through a hole 8G provided to the sleeve 8 corresponding to the clearance B and a lubrication oil hole 2A provided to the rotary supporting section 2 corresponding to the hole 8G. |
