Rolling bearing device and oil supply unit
AssigneeJtekt Corporation
InventorsTsukasa Sakazaki, Yoshimichi Higashiyama, Masami Naka
Life of this patent
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Abstract
A rolling bearing device includes: a bearing portion that has an inner ring, an outer ring, a plurality of balls, and a cage that holds the plurality of balls; and an oil supply unit provided adjacent to the bearing portion in the axial direction and configured to supply lubricating oil to the bearing portion. The oil supply unit has: a pump that suctions lubricating oil into an oil chamber and discharges the lubricating oil by varying a capacity of the oil chamber by periodically driving a piezo element; and a control portion that causes the pump to operate by varying a rising time of a voltage applied to the piezo element in accordance with whether a drive period of the piezo element is long or short.
Claims5
A rolling bearing device comprising:
- a bearing portion that has an inner ring, an outer ring, a plurality of rolling elements interposed between the inner ring and the outer ring, and a cage that holds the plurality of rolling elements;
- and
- an oil supply unit provided adjacent to the bearing portion in an axial direction and configured to supply lubricating oil to the bearing portion, wherein
- the oil supply unit has:
- a pump that suctions lubricating oil into an oil chamber and discharges the lubricating oil by varying a capacity of the oil chamber by periodically driving a piezo element;
- and
- a control portion that causes the pump to operate by changing a rising time of a voltage applied to the piezo element in accordance with whether a drive period of the piezo element is long or short.
An oil supply unit provided in a rotary device and configured to supply lubricating oil to an oil supply region of the rotary device that requires oil supply, the oil supply unit comprising:
- a pump that suctions lubricating oil into an oil chamber and discharges the lubricating oil by varying a capacity of the oil chamber by periodically driving a piezo element;
- and
- a control portion that causes the pump to operate by changing a rising time of a voltage applied to the piezo element in accordance with whether a drive period of the piezo element is long or short.
Dependencies are inferred from the claim text.