RU2349776C2 - Device for lubrication of gas-turbine engine bearing and method for its assembly - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: invention is related to devices for lubrication of gas-turbine engine bearings and may be applied in most stressed supports of turbomachines rotors. Catching hole of visor arranged as integral with oil catching ring, is coupled with receiving socket provided on rotor journal, recesses are provided on internal surface of oil catching ring, which connect receiving sockets with collecting cavity, besides, oil supply channels are arranged on mounting surface of shaft for bearing internal ring, and these channels connect collecting and flow cavity. Recesses on internal surface of oil catcher ring have conical surface. Mutual position of receiving socket located on rotor journal, catcher hole and local recess on oil catcher ring is fixed by means of pin.

EFFECT: improvement of device for oil supply to holes at the ends of bearing internal ring half-races, when oil bath is not available on journal internal surface.

3 cl, 8 dwg

Description

The invention relates to gas turbine engineering, and in particular to devices for lubricating bearings of a gas turbine engine, and can be used in the most stressed bearings of turbomachine rotors.

The bearings of the rotor bearings of gas turbine engines are loaded with high axial and radial forces and require reliable lubrication and cooling to ensure operation for a given resource.

In the field of gas turbine technology, the following layout solutions for supplying oil to the bearing and its lubrication are used.

The oil enters through the calibration holes into the gap between the inner ring of the bearing and the cage, under the action of inertial forces it lubricates the bearing surfaces well, cools it and flows out through the gap between the cage and the outer ring. Oil is supplied to the bearing through the wells at the junction of the half rings of its inner race.

Known supports of a gas turbine engine (RU 2144995 C1 F02C 7/06, SU 1307932 F1 F02C 1/06), where the inner race of the bearing is mounted on the axle of the rotor, and the oil is fed through radial holes connecting the distribution of oil with the oil bath formed on the inner surface trunnions.

There is a bearing lubrication device (RU 2194177), where oil is thrown under the visor of a nut tightening the half bearings of a thrust bearing.

All these designs are carried out with the possibility of casting a jet of oil on the inner surface of the journal or under the nut visor.

The design task is to supply oil to the bearing if it is not possible to cast oil under the pin.

The closest in technical essence to the claimed device is the oil supply to the third support of the low pressure rotor of the R-11F-300 engine (Design and engineering of aircraft gas turbine engines. Editorial D.V. Chronina. Engineering. 1989, p.207).

The disadvantages of this design are:

- the need to separately perform the visors of the oil recovery ring (increases the complexity);

- the presence of locking screws for attaching the visors and oil ring (reduces reliability);

- limitation of the scope (only the shaft bearing);

- does not provide the optimal amount of oil, as for 1 revolution of the shaft, 3 oil grabs are carried out only by an arc of 45 °, and oil is sprayed on an arc of 123 °;

- unsuccessfully profiled oil catch visor, because cuts off a growing stream of oil very early.

The objective of the invention is to improve the device for supplying oil to the wells at the ends of the semi-hollow inner rings of the bearing in the absence of an oil bath on the inner surface of the shaft.

The problem is solved in that in a device for lubricating a bearing of a gas turbine engine containing an oil collecting ring having a visor with a catching hole, mounted on a trunnion trunnion, lubricating oil supply nozzles, a storage cavity, according to the invention, a catching hole of a visor made in one piece with the oil catching ring is coupled to a receiving hole made on the axle of the rotor; on the inner surface of the oil collecting ring, samples are made connecting the receiving holes to opitelnoy cavity. On the landing surface of the shaft under the inner ring of the bearing, oil-supplying channels are made connecting the storage and supply cavities.

Moreover, the samples on the inner surface of the oil collecting ring have a conical surface to create a centrifugal pressure.

The problem is solved in that in the method of assembling a device for lubricating the bearing of a gas turbine engine by fixing the relative position of the oil catch ring and the axle of the rotor, according to the invention, the catch hole of the visor of the oil ring is mated with the receiving hole on the rotor axle, and the mutual position of the receiving hole located on the rotor axle , catch holes and local sampling on the oil catch ring is fixed by setting the pin.

The oil supply process is as follows.

From a calibrated opening of the oil supply channel, the oil jet moves towards the rotation of the oil catch ring. The speed of the oil and the peripheral speed of the oil catch ring are different, so the oil jet goes through the following steps:

- stage of absorption of the jet;

- stage of useless spraying of a jet;

- stage of useful jet growth.

The required number of visors with catch holes on the oil catch ring is determined from the ratios of the growth length of the oil jet (L ₁ -L ₂ ) (Fig. 7, 8) and the angle of rotation of the oil catch ring (α ₁ + α ₂ ) where,

L ₁ - the length of the jet of oil from the nozzle to the point of meeting with the catch hole;

L ₂ - the length of the jet from the nozzle to the point of exit of oil from the catching hole;

α ₁ is the angle by which the oil catching ring is rotated from the point of meeting of the oil jet with the catching hole;

α ₂ is the angle by which the oil catch ring is rotated to the point of exit of the oil jet from the catch hole.

To ensure the required balancing in the engine design, the number of catching holes is 2, which are located diametrically, the number of oil-supplying nozzles is 1, since the oil is captured after 1/2 turn. During experimental testing at a special stand, 65% of the supplied oil was absorbed and delivered to the rolling bodies of the thrust bearing.

Figure 1 shows a longitudinal section of an engine with an oil catching device.

Figure 2 shows a cross section of an engine with an oil trap and an optimal oil trap.

Figure 3 shows a cross section along the receiving hole.

Figure 4 shows a cross section along the seating surface of the shaft under the inner ring of the bearing and oil supply channels on it.

Figure 5 shows a view of the inner surface of the oil catch ring.

Figure 6 shows a cross-section through a local sample of the oil catch ring.

7 shows the moment of meeting of the catching hole with a stream of oil.

On Fig shows the moment of exit of the catching hole from the jet of oil.

A device for lubricating a bearing 2 mounted on a rotor shaft 1 of a gas turbine engine of a bearing 2 (Fig. 1) comprises an oil catch ring 3 fixed in a certain position relative to the rotor shaft 1 with a pin 4, oil supply means including an oil dispensing groove 5, an oil supply opening 6 and a flow nozzle 7.

The bearing 2 has a cut inner ring, consisting of two half-holes 8, at the mutual ends of which oil-dispensing holes 9 are made, connected to the supply cavity 10, which is connected to the storage cavity 12 with the help of the oil-supplying channels 12. The oil-catching visors 13 (Fig. 2) are made as integral with oil catch ring 3 and profiled so that spraying of the oil stream is minimal. The trap holes 14 of the visors 13 are connected to the receiving holes 15 in such a way that the axis of each trap hole 14 is parallel to the tangent 16 to the inner surface 17 of the receiving hole 15 connected to it. Each receiving hole 15 is connected to the storage cavity 12 by means of a local sampling 18 (Fig. 1 )

The device operates as follows.

The oil from the oil system of the engine comes from the oil dispensing groove 5 into the oil supply hole 6, then through the nozzle 7 is jetted into the oil cavity. Toward the movement of the jet, the oil catching ring 3 rotates with visors 13. The grown jet for 1/2 turn of the oil catching ring 3 begins to be caught by hole 14 (Fig. 7) until its absorption is complete (Fig. 8) (stage of jet absorption). After which there is a slight spraying of the stream (spraying stage). Then, up to the approach of the diametrically located catching hole 14 (1/2 turn), an oil jet grows, which is absorbed by the second catching hole 14. The absorbed oil, through the receiving holes 15 and local samples 18, having a conical surface M for creating a centrifugal pressure, comes into the accumulation cavity 12, from where it passes through the oil supply channels 11 to the discharge cavity 10. From the discharge cavity 10 through the oil dispensing holes 9, oil washes the working surface of the inner ring, bearing balls, and d action of inertial forces hits the treadmill of the outer ring, washes it off and flows through the gap between the separator and the outer bearing ring.

The assembly of the device for lubricating the bearing of a gas turbine engine is to ensure and fix the relative position of the oil catch ring 3 and the shaft 1 of the rotor.

For this, the catching holes 14 of the visors 13 of the oil catching ring 3 are mated with the receiving holes 15 on the rotor shaft 1 so that the axis of each catching hole 14 is parallel to the tangent 16 to the inner surface 17 of the receiving hole 15 connected to it. Then, the oil catching ring 3 is fixed in this position on rotor shaft 1 with pin 4.

Claims (3)

1. A device for lubricating a bearing of a gas turbine engine, comprising an oil catch ring, having a visor with a catch hole, mounted on a rotor pin, lubricating oil supply nozzles and a storage cavity, characterized in that the catch hole of the peak made in one piece with the oil catch ring is interfaced with the receiving hole made on the axle of the rotor, on the inner surface of the oil catching ring made samples connecting the receiving holes with the storage cavity, and on the landing The shaft surface under the inner ring of the bearing is made of oil-supplying channels connecting the storage and supply cavities. 2. The device according to claim 1, characterized in that the samples on the inner surface of the oil collecting ring have a conical surface. 3. A method of assembling a device for lubricating a bearing of a gas turbine engine by fixing the relative position of the oil collecting ring and the rotor journal, characterized in that the catching hole of the oil collecting ring visor is mated with the receiving hole on the rotor journal and the mutual position of the receiving hole located on the rotor journal and a local sample on the oil catch ring is fixed by setting the pin.

Images