A taper roller bearing includes: an inner ring, an outer ring, a plurality of taper rollers, and an annular cage which holds the plurality of taper rollers at an interval in the circumferential direction. The cage includes a small-diameter annular portion on one axial side, a large-diameter annular portion on the other axial side, and a plurality of column portions. An inner circumferential surface of the small-diameter annular portion includes a first inner circumferential surface portion and a second inner circumferential surface portion having a small diameter. An outer circumferential surface of the small flange included in the inner ring includes a first outer circumferential surface portion which opposes the first inner circumferential surface portion having a fine clearance, and a second outer circumferential surface portion which has a small diameter and opposes the second inner circumferential surface portion having a fine clearance.

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.

A roller bearing seal includes an insert part and a polymer part connected to the insert part, and the insert part includes an annular-disc-shaped middle section having a radially inner deflection and a radially outer deflection, and a first ratio (L2/L1) of an axial length (L2) of the outer deflection to an axial length (L1) of the inner deflection is less than 0.65.

A bearing device includes a bearing portion that includes an inner ring, an outer ring, a plurality of rolling elements that are interposed between the inner ring and the outer ring, and a cage that holds the plurality of rolling elements, one of the inner ring and the outer ring being a rotational ring, and another of the inner ring and the outer ring being a fixed ring; and an oil supply unit that is provided adjacent to the bearing portion in an axial direction. The cage includes a guide portion that is configured to be in sliding contact with a part of the fixed ring via lubricating oil. The oil supply unit includes a vibration sensor configured to detect a vibration of the fixed ring, and a pump configured to supply the lubricating oil to the bearing portion.

A cage (5) for separating rolling bodies (2) for a bearing (1), particularly for a timepiece bearing, the cage having first openings (50) for receiving rolling bodies and at least one first contact zone (56) intended to come into contact with a bearing ring and having at least one first hollow formation (52).

A cage made of a resin includes: a small-diameter annular portion on one side in an axial direction; a large-diameter annular portion on the other side in the axial direction; and a plurality of column portions which link the small-diameter annular portion and the large-diameter annular portion to each other. Spaces which are formed between the large-diameter annular portion and the small-diameter annular portion and between the column portions adjacent to each other in the circumferential direction are pockets which hold the taper rollers. A surface of the entire cage including the small-diameter annular portion, the large-diameter annular portion, and all of the column portions is configured by aggregating a surface viewed from the one axial side and a surface viewed from the other axial side.

In order to make a bearing, such as a roller bearing, insensitive to a lack of maintenance lubrication or irregular maintenance lubrication while at the same time retaining its mechanical performance, at least one bearing part of the bearing is provided at least partially with an oleophilic adhesion promoter layer. The adhesion promoter layer binds a lubricant layer of the bearing to the bearing part provided with the adhesion promoter layer. The adhesion promoter layer is bonded to an elemental-iron-free surface of a bearing part body. The removal of free iron from the bearing part body surface is carried out with nitric acid, chromate solution and/or citric acid. The treated bearing part has an oleophilic anti-corrosion adhesion promoter layer. The bearing may be used in pressure-operated devices, in particular in turbine handpieces used by dentists, because the loss of the lubricant layer during operation of the device was particularly high.

A wheel bearing arrangement for a vehicle, having rotatable and statically fixed components, and at least two rolling body bearings arranged radially between the rotatable and statically fixed components for rotatably mounting the rotatable component. The at least two rolling body bearings have in each case an inner ring, an outer ring, and a rolling body row arranged therebetween. A spacer sleeve is arranged at end sides of the respective inner rings for axially securing the two inner rings. A respective securing ring is arranged fixedly on the respective inner rings so as to rotate therewith. The securing rings each have a substantially axially configured lug with a respective radial embossment arranged in a respective groove configured on an outer circumferential face of the spacer sleeve, in order to connect the respective inner rings axially to the spacer sleeve via the respective securing rings.

A taper roller bearing includes: an inner ring, an outer ring, a plurality of taper rollers in which a cavity portions are formed on a large end surface, and an annular cage. The cage includes a small-diameter annular portion on one axial side, a large-diameter annular portion which is positioned on the other axial side and on the outer side in the radial direction of the large flange, and a plurality of column portions. An outer diameter of an axial inner surface included in the large-diameter annular portion is greater than a diameter of a virtual circle that links outer end portions in the radial direction of the cavity portions of the plurality of taper rollers.

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.