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NTN
BEARING CORPORATION OF AMERICA |
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Single
Lip Land* Riding Seal with Trash Guard
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Single Lip Land* Riding Seal
This seal (see illustration AR) features a combination of a synthetic rubber seal and metal trash guard. Although this seal is referred to as a single lip, in fact it has two lips. The larger primary lip maintains contact with the inner ring and seals the bearing. The smaller flared secondary lip serves several purposes. It provides additional rigidity to the primary lip, it retains some grease for the lubrication of the primary lip and it helps to channel grease back into the bearing raceway. A key consideration in selecting this type of seal is that even under moment loads the primary lip continues to seal the bearing. If the misalignment is severe enough, the secondary lip may also contact the inner ring. In addition, the trash guard protects the seal lips from abrasion. This type of seal is used in bearing applications subjected to heavy dirt contamination, such as balers, disk openers and combines. This seal type is used on JEL, AR, REL and UR series insert bearings and on several SBX (special dimension) insert bearings. * Land (as in "landing") refers to the flat surface on the inner ring’s outer diameter.
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