| 摘要 |
PROBLEM TO BE SOLVED: To prevent premature hardening and generation of crack of an outer lip, to prevent intrusion of rolling oil, and to prevent deterioration of bearing oil, seizing of bearing and generation of trip at the time of starting a mill by using >= two kinds of rubber materials according to characteristics required for the parts constituting each of the functions of a seal. SOLUTION: A roll neck seal 60 has an outer lip 62 projecting outward in a plate-like shape from the base body in the radial direction, an inner lip 61, and a bearing oil splashing lip 63. Both of the outer lip 62 and the inner lip 61 have a sealing contact with a seal plate 17, the outer lip 62 prevents intrusion of rolling oil and the inner lip 61 prevents flowing-out of bearing oil. The bearing oil splashing lip 63 likewise prevents the flowing-out by splashing the bearing oil. By making each of the inner and outer lips 61, 62 of nitril rubber and heat resisting hydrogenerated nitril rubber respectively, hardening and crack of the outer lip 62 having heavier deterioration than the inner lip 61 are prevented for a long period, and further deterioration of bearing oil due to intrusion of rolling oil and seizing of bearing due to such causes or the like are prevented. |
