A rolling bearing provides an inner ring and an outer ring concentrically about a rotation axis X-X running in an axial direction, and at least first and second axial bearings each axially disposed between the inner ring and the outer ring and each having at least one row of rolling elements, the first and second axial bearings being spaced apart from each other in the axial direction. The rolling bearing further provides only one radial bearing radially disposed between the inner ring and the outer ring and having at least one row of rolling elements. The radial bearing is disposed between an outer raceway located on the inner ring and an inner raceway located on the outer ring.

Provided is a double-row self-aligning roller bearing including: an inner ring; an outer ring having a spherical raceway surface; and rollers arranged in two rows and interposed between the inner ring and the outer ring, wherein a ratio of a contact angle 1 in one row to a contact angle 2 in the other row falls within a range of 0.251/20.5, and a ratio of distance B1 in a bearing width direction from an end face of the bearing on a side of the one of the rows to an intersection of two lines of action defining the contact angles of the two rows, relative to a distance B2 in the bearing width direction from an end face of the bearing on a side of the other of the rows to the intersection falls within a range of 0.5B1/B20.6.

A multi-row rolling bearing having an inner ring and an outer ring and at least two axial rolling bearing rows for supporting axial forces between the inner and outer ring, wherein the two axial rolling bearing rows are seated on opposite axial sides of a radially projecting annular lug which engages in an annular groove and which is supported by means of said axial rolling bearing rows against the annular groove. According to the invention, at least one of the axial rolling bearing rows is formed as an angular-contact roller bearing with an angle of inclination of greater than 0 to at most 45.

Disclosed is an electronic motor with two bearings. The motor is structured so that, when loaded, the majority of the load (e.g., a radial load) is borne by one of the bearings. The bearing that bears a greater load may be larger and, thus, better suited for a heavy load. In some embodiments, the larger bearing may include rolling elements that have respective radii larger than respective radii of rolling elements of the other bearing by a ratio of at least 1.5 (150%). In some embodiments, the larger bearing may have an outer race with a radius that is greater than a radius of the outer race of the smaller bearing by a ratio of at least 1.5. In some embodiments, the motors may include a third bearing between the two bearings. The third bearing may reduce vibration in the motor.

A rolling bearing provides an inner ring and an outer ring concentrically about a rotation axis X-X running in an axial direction, and at least first and second axial bearings each axially disposed between the inner ring and the outer ring and each having at least one row of rolling elements, the first and second axial bearings being spaced apart from each other in the axial direction. The rolling bearing further provides only one radial bearing radially disposed between the inner ring and the outer ring and having at least one row of rolling elements. The radial bearing is disposed between an outer raceway located on the inner ring and an inner raceway located on the outer ring.

A sealed bearing module for a tidal turbine, the tidal turbine including a hub and at least one rotor blade, the sealed bearing module including an inner ring, and an outer ring, and a seal system configured to seal the bearing module. The outer ring includes axially extending bores configured to receive fasteners for attaching the outer ring directly to the hub, and the inner ring includes axially extending bores for attaching the inner ring directly or indirectly to the rotor blade.

Embodiments of the present invention may provide a multirow ball bearing capable of effectively dispersing a radial load while reducing a frictional force when an inner ring and an outer ring rotate relative to each other, and a method of manufacturing same. Multiple ball rows (5) may be adjacently interposed between an inner ring (3) and an outer ring (4); each of the multiple ball rows (5) may include balls (5a) arranged with prescribed gaps (L) therebetween and may be arranged in staggered fashion so as to be shifted in a row direction of the ball row (5) relative to a ball row (5) adjacent to the ball row (5), and the balls (5a) in each of the ball rows (5) may face spaces (LS) formed by the prescribed gaps (L) in a ball row (5) adjacent to the ball row (5), each of the balls being brought into contact with two of the balls (5a) that define one of the prescribed gaps.

A double-row self-aligning roller bearing has rollers interposed, in two rows aligned in a bearing width direction, between an inner ring and an outer ring. The outer ring has a spherical raceway surface. Each of the rollers has an outer circumferential surface having a cross-sectional shape that matches the raceway surface of the outer ring. The rollers have lengths equal to each other and maximum diameters equal to each other, and have different distances from centers of the roller lengths to positions at which the maximum diameters are obtained.

A roller bearing having a rotatable first ring and a non-rotatable second ring arranged concentrically, the first ring having a circumferential groove opening towards the non-rotatable second ring into which is arranged a protruding element, between which are arranged a single radial roller bearing and two axial roller bearings spaced apart in the axial direction respectively on opposite radial faces of the protruding element. The roller bearing includes a plurality of circumferentially spaced apart cam followers secured to the rotatable first ring.

A roller bearing having a rotatable first ring and a non-rotatable second ring arranged concentrically, the second ring having a circumferential groove opening towards the first ring into which is arranged a protruding element, between which are arranged a single first radial roller bearing and two axial roller bearings spaced apart in the axial direction respectively on opposite radial faces of the protruding element. The roller bearing includes a plurality of circumferentially spaced apart second radial roller bearings secured to the rotatable first ring.