Seal for rolling bearing and rolling bearing

Abstract

In a seal for a rolling bearing, necessary sealing performance is maintained while reducing sliding resistance (torque of the bearing). A seal (6) for a rolling bearing includes a core metal (10) andan elastic member (11) configured to cover the core metal. A fitting portion (12) is fixed to an outer ring and a seal portion (13) contacts an inner ring (2). In the outer side of the seal portion anauxiliary lip (15) projects without contacting the outer periphery (2A) the inner ring (2) and contacting the inner side of the inner ring (2), a main lip (16) projects toward the inner periphery ofa thick wall portion (13A). An annular groove (18) is formed between the main lip (16) and the thick wall portion (13A) thus forming a flexible portion (19) having a small wall thickness at a root portion of the main lip (16). The auxiliary lip (15) inhibits intrusion of foreign substances and moisture, reduces external pressure acting on the main lip (16) and ensures the sealing performance of the main lip (16). The flexible portion (19) reduces the sliding resistance of the main lip (16).

Description

technical field [0001] The present invention relates to a rolling bearing seal that seals between an inner ring and an outer ring of a rolling bearing, and a rolling bearing equipped with the seal. Background technique [0002] Among rolling bearings, there is a rolling bearing with a seal including a seal that seals between an inner ring and an outer ring in order to prevent foreign matter such as dust and / or water from entering from the outside and to prevent leakage of grease sealed inside the bearing. Rolling bearings with seals generally fix a ring-shaped seal composed of a rubber seal member reinforced by a core (inner core) to one of the inner ring or the outer ring, and make the lip of the seal member come into contact with the other, sealing the inner and outer rings together. seal between. Furthermore, by designing the shape of the lip of the sealing member, etc., the sliding resistance (torque of the bearing) can be reduced while improving the sealing performance...

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