Abnormality detection device for rolling bearing
AssigneeNtn Corporation
InventorHiroyoshi Ito
Life of this patent
Estimating the term…
Abstract
An abnormality detection device for a rolling bearing includes a filter that allows passage of lubricating oil, while preventing passage of metal pieces, from the bearing space between the outer ring and the inner ring of the rolling bearing to the exterior of the bearing space. The device further includes an electrical circuit including a pair of permanent magnets mounted, as a pair of electrodes, to the filter so as to be spaced apart from each other, and electrical lines extending from the respective electrodes to a power source. A state detector detects a change in electrical output from the electrical circuit when metal pieces adhere between the pair of permanent magnets, thereby detecting the state of the metal pieces contained in the lubricating oil.
Claims20
An abnormality detection device for a rolling bearing that includes an outer ring, an inner ring, and rolling elements disposed in a bearing space between the outer ring and the inner ring,
- the abnormality detection device comprising:
- a filter configured to allow passage of lubricating oil in the bearing space, while preventing passage of metal pieces mixed in the lubricating oil;
- an electrical circuit including a pair of electrodes comprising a pair of permanent magnets spaced apart from each other and mounted to the filter, and electrical lines extending from the respective electrodes to a power source, the electrical circuit being configured to produce an electrical output that changes as the metal pieces are partially attracted to the permanent magnets;
- and
- a state detector configured to detect a change in the electrical output from the electrical circuit so as to detect a state of the metal pieces mixed in the lubricating oil.
Dependencies are inferred from the claim text.