Composite sliding bearing and wind power generating device using the same bearing
A composite sliding bearing is disclosed. The composite sliding bearing has an inner ring, formed of split rings halved by a center in an axial direction, which has V-section inclined surfaces formed on the outer diameter surfaces of the split rings, bearing pads disposed separately on the inclined surfaces of the split rings along the outer diameter surface of the inner ring, and an outer ring on the inner diameter surface of which is formed a V-section umbrella-shaped inclined surface corresponding to the outer diameter surface of the inner ring. A radial load and axial load applied to the bearing are supported by sliding the inner diameter surface of the outer ring on the sliding surfaces of the bearing pads in a condition in which the bearing pads are fluid lubricated.
1. A composite sliding bearing, comprising:
an inner ring including ring bodies halved by an axially central dividing surface;
bearing pads disposed on inclined surfaces of the ring bodies; and
an outer ring disposed on the bearing pads and having an inner diameter surface corresponding to an outer diameter surface of the inner ring;
wherein a radial load and an axial load applied to the bearing pads are supported by sliding the inner diameter surface of the outer ring on sliding surfaces of the bearing pads when the bearing pads are fluid-lubricated; and
wherein an oil supply groove is cut in a central portion of an inner diameter surface of the inner ring, and oil supply holes, communicating with the oil supply groove, which pass through the inner ring in a radial direction, are bored in the inner ring, lubricating oil being supplied from the oil supply groove via the oil supply holes to the sliding surfaces of the bearing pads on which the outer ring slides.
2. The composite sliding bearing according to claim 1 , wherein the bearing pads are tilting pads that enable a tilting movement in at least a direction of rotation of the bearing.
3. The composite sliding bearing according to claim 1 , wherein a white metal or a resin overlay is applied to the sliding surfaces of the bearing pads.
4. The composite sliding bearing according to claim 1 , wherein elastic support seats are inserted between rear surfaces of the bearing pads and the inclined surfaces of the ring bodies.
5. A wind power generating device, wherein a composite sliding bearing according to claim 1 is a bearing of a main shaft, the inner ring of the composite sliding bearing being fixed to a fixed shaft provided on a nacelle side and the outer ring of the composite sliding bearing being fixed to a rotor center of a generator, thus supporting a rotor of the generator and a wind turbine on the fixed shaft.
6. The wind power generating device according to claim 5 , wherein:
the composite sliding bearing is such that a nacelle-side ring body of the inner ring bodies to which the bearing pads are attached is fitted on the fixed shaft and positioned and held in a predetermined position; and
the outer ring is mounted in a fixed position from a leading-edge side of the fixed shaft and joined to the rotor center, and another ring body of the inner ring bodies is fitted on the fixed shaft and fixed and supported in a fixed position.
7. The wind power generating device according to claim 5 , wherein:
the fixed shaft is a hollow fixed shaft formed into a shape having a space inside; and
oil supply holes communicating with the oil supply groove of the inner diameter surface of the inner ring are bored in a peripheral surface of the hollow fixed shaft to which is joined the inner ring of the composite sliding bearing, thus supplying, to the composite sliding bearing, lubricating oil fed from an oil pump through the oil supply holes of the peripheral surface of the hollow fixed shaft.