Grease-sealed bearing
AssigneeNtn Corporation
InventorKota Watanabe
Life of this patent
Estimating the term…
Abstract
To provide a grease-sealed bearing that is superior in fretting wear resistance and sealing performance when used under an oscillation condition with acceleration and deceleration such as a condition used in a robot joint. A grease-sealed bearing 1 includes an inner ring 2 and an outer ring 3 that are raceway rings, a plurality of rolling elements 4 interposed between the inner ring 2 and the outer ring 3, and a grease composition 7 sealed around the rolling elements 4. The bearing oscillates such that a bearing rotational direction changes while accelerating and decelerating. The grease composition contains a base oil and a thickener. The worked penetration of the grease composition is 310 or more. The thickener is a calcium sulfonate complex soap.
Claims6
A grease-sealed bearing comprising:
- an inner ring and an outer ring that are raceway rings;
- a plurality of rolling elements that is interposed between the inner ring and the outer ring;
- and
- a grease composition that is sealed around the rolling elements,
- the bearing being configured to oscillate such that a rotational direction of the bearing changes while accelerating and decelerating,
- wherein:
- the grease composition contains a base oil and a thickener,
- the worked penetration of the grease composition is 310 or more, and
- the thickener is a calcium sulfonate complex soap.
Dependencies are inferred from the claim text.