Bearing unit for fluid machinery application

摘要

A bearing unit for a fluid machinery application having a double-row bearing, the double-row bearing comprising: a first angular self-aligning contact bearing arranged next to a second angular self-aligning contact bearing for locating and rotatably support a shaft; each angular self-aligning contact bearing having a respective set of rolling elements formed of rollers arranged in a row and interposed between an associated curved inner raceway and a curved outer raceway. Each roller is a symmetrical cylindrically shaped roller having a curved raceway-contacting surface engaging with the curved inner and outer raceways. Each roller is inclined in relation to the axial direction of the shaft by a respective first or second contact angle. The rollers are arranged to cooperate with the associated curved inner and raceways for supporting an axial force and a radial force. Examples of fluid machinery applications include: wind turbine, water turbine or propulsion turbine arrangements.

主权项

1. A bearing unit for a fluid machinery application having a double-row bearing, the double-row bearing comprising:
a first angular self-aligning contact bearing arranged next to a second angular self-aligning contact bearing for locating and rotatably support a shaft; the first angular self-aligning contact bearing having a first set of rolling elements formed of a first plurality of rollers arranged in a first row and interposed between a first curved inner raceway and a first curved outer raceway, wherein each of the first plurality of rollers is elongated and has a first curved raceway-contacting surface being engageable with the first curved inner raceway and the first curved outer raceway, and wherein each of the first plurality of rollers of the first angular self-aligning contact bearing is inclined in relation to the axial direction of the shaft by a first contact angle; whereby the first plurality of rollers are arranged to cooperate with the first curved inner raceway and the first curved outer raceway for supporting an axial force and a radial force; the second angular self-aligning contact bearing having a second set of rolling elements formed of a second plurality of rollers arranged in a second row and interposed between a second curved inner raceway and a second curved outer raceway, wherein each of the second plurality of rollers is elongated and has a second curved raceway-contacting surface being engageable with the second curved inner raceway and the second curved outer raceway, and wherein each of the second plurality of rollers of the second angular self-aligning contact bearing is inclined in relation to the axial direction of the shaft by a second contact angle; whereby the second plurality of rollers are arranged to cooperate with the second curved inner raceway and the second curved outer raceway for supporting the axial force and the radial force; wherein each of the first plurality of rollers of the first angular self-aligning contact bearing is inclined in relation to each of the second plurality of rollers of the second angular self-aligning contact bearing such that a first pressure centre of the first angular self-aligning contact bearing is displaced from a second pressure centre of the second angular self-aligning contact bearing, wherein a single ring forms one of: (1) the first and second curved inner raceways, and (2) the first and second curved outer raceways, and another one of: (1) the first and second curved inner raceways, and (2) the first and second curved outer raceways which is not formed by the single ring provides opposing raceway surfaces to the single ring, wherein the single ring is movable with respect to the opposing raceway surfaces during operation such that the opposing raceway surfaces can move axially relative to the single ring, the single ring is also moveable with respect to the opposing raceway surfaces during operation such that the opposing raceway surfaces can be angularly displaced with respect to the single ring and a rotation axis of the bearing unit.