Abstract: A rolling bearing apparatus includes: a bearing portion having an inner ring, an outer ring, a plurality of balls, and a cage; and a lubrication unit that is provided adjacently to an annular space formed between the inner ring and the outer ring and that has a pump that feeds a lubricant into the annular space. The pump has a main body portion having an internal space in which the lubricant is retained and being open at one end of the main body portion, a metal diaphragm fixed to a fixation portion that is a part of the main body portion so as to close the opening of the main body portion, and a piezoelectric element fixed to the diaphragm. At least the fixation portion of the main body portion is formed of metal, and the fixation portion and the diaphragm are fixed together by metal joining.

Abstract: A rolling bearing apparatus includes a bearing portion and a lubrication unit. The lubrication unit is provided adjacently to an annular space in an axial direction. The annular space is formed between an inner ring and an outer ring, and the lubrication unit has a tank storing lubricant that is supplied to the annular space. The tank has an outer wall on a radially outer side, and a space formed on a radially inner side of the outer wall is a storage portion for storing the lubricant. An oil supply hole that is used to refill the storage portion with the lubricant is provided passing through the outer wall. The oil supply hole is open to the radially outer side.

Abstract: A rolling bearing apparatus includes a bearing portion and a lubrication unit. The lubrication unit is provided adjacently to an annular space in an axial direction. The annular space is formed between an inner ring and an outer ring, and the lubrication unit has a tank storing lubricant that is supplied to the annular space. The tank has an outer wall on a radially outer side, and a space formed on a radially inner side of the outer wall is a storage portion for storing the lubricant. An oil supply hole that is used to refill the storage portion with the lubricant is provided passing through the outer wall. The oil supply hole is open to the radially outer side.

Abstract: A rolling bearing apparatus includes: a bearing portion having an inner ring, an outer ring, a plurality of balls, and a cage; and a lubrication unit that is provided adjacently to an annular space formed between the inner ring and the outer ring and that has a pump that feeds a lubricant into the annular space. The pump has a main body portion having an internal space in which the lubricant is retained and being open at one end of the main body portion, a metal diaphragm fixed to a fixation portion that is a part of the main body portion so as to close the opening of the main body portion, and a piezoelectric element fixed to the diaphragm. At least the fixation portion of the main body portion is formed of metal, and the fixation portion and the diaphragm are fixed together by metal joining.

Abstract: A rolling bearing apparatus includes a lubrication unit provided adjacently to an annular space formed between an inner ring and an outer ring. The lubrication unit includes a tank that stores a lubricant to be supplied to an annular space and that has an outlet portion through which the lubricant flows out. The tank has a flexible bag in which the lubricant is stored. The bag is filled with the lubricant and allows the lubricant to flow out through the outlet portion as a volume of the bag decreases.

Abstract: A rolling bearing apparatus includes a lubrication unit provided adjacently to an annular space formed between an inner ring and an outer ring. The lubrication unit includes a tank that stores a lubricant to be supplied to an annular space and that has an outlet portion through which the lubricant flows out. The tank has a flexible bag in which the lubricant is stored. The bag is filled with the lubricant and allows the lubricant to flow out through the outlet portion as a volume of the bag decreases.