RU2676204C1 - Plain thrust bearing - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to engineering, namely to thrust bearings. Plain thrust bearing comprises a thrust collar, annular thrust bearing (2) with fixed pads (3), having a wedge-shaped profile, forming wedge gaps (7) with the thrust collar, housing (4), tapering radial channels (5) for supplying lubricating fluid to fixed pads (3) and hydrostatic pockets (6). Annular thrust bearing (2) is made with internal annular channel (8), connected by discharge holes (9) to wedge gaps (7) and supply holes (10) with hydrostatic pockets (6). Discharge holes (9) are made with a larger diameter than the diameter of supply holes (10).

EFFECT: increased bearing ability of the plain thrust bearing.

5 cl, 11 dwg

Description

The invention relates to the field of mechanical engineering, namely to thrust bearings.

Known classic hydrodynamic (due to the rotation of the heel) thrust sliding bearing containing the heel, an annular thrust bearing with fixed pillows having a wedge-shaped profile, forming wedge gaps with the fifth, narrowing radial channels for supplying lubricant to the fixed pillows. The thrust bearing rests on the surface of the housing. [Two-rotor screw and spur compressors. Theory, calculation and design I.G. Khisameev, V.A. Maximov. FEN Publishing House, Kazan, 2000. - S. 468-473].

A disadvantage of the known thrust bearing is its low bearing capacity.

Known hybrid thrust sliding bearing containing a heel, an annular thrust bearing with fixed pillows having a wedge-shaped profile, forming wedge gaps with the fifth, between which are made hydrostatic pockets in communication with an external source of fluid pressure. The thrust bearing rests on the surface of the housing. [Fundamentals of tribotechnology and hermetology: textbook, V.A. Maximov, G.S. Batkis. Publishing house "Title-Kazan", 2007. - S.220-222, S. 234-236].

A hybrid bearing has the greatest bearing capacity as a result of hydrodynamic (due to the rotation of the heel) and hydrostatic (due to an external pressure source) effects.

A disadvantage of the known technical solution is the need for an external source of liquid pressure, which is not always possible to implement.

The problem to which the claimed invention is directed is to increase the bearing capacity of a thrust sliding bearing.

The technical result is achieved in that in a thrust sliding bearing containing a heel, an annular thrust bearing with fixed pillows having a wedge-shaped profile, forming wedge gaps with a fifth, a housing, tapered radial channels for supplying lubricant to the fixed pillows and hydrostatic pockets, according to the invention, an annular thrust bearing made with an annular channel communicated with wedge gaps with outlet holes and with hydrostatic pockets with inlet holes, while the outlet holes ment are made with a larger diameter than the diameter of the supply opening.

In addition, the hydrostatic pockets may be located on the annular thrust bearing on the heel side, between the stationary cushions, or may be located on the annular thrust bearing on the side of the bearing housing, while the hydrostatic pockets may be provided with sealing elements.

An annular thrust bearing can be mated to the housing on a spherical surface.

The invention is illustrated graphically, where:

in FIG. 1 shows a longitudinal section of a sliding bearing with hydrostatic pockets located on the heel side between the fixed pillows, along the fixed pillows and hydrostatic pockets;

in FIG. 2 is a cross section AA of FIG. one;

in FIG. 3 is a longitudinal section of a bearing BB of FIG. 2;

in FIG. 4 is an expanded section G-D of FIG. 2;

in FIG. 5 - remote element I of FIG. one;

in FIG. 6 shows a longitudinal section of a bearing with hydrostatic pockets located on the side of the housing;

in FIG. 7 is a cross section DD of FIG. 6;

in FIG. 8 -; cross section WF of FIG. 6;

in FIG. 9 - remote element II of FIG. 6;

in FIG. 10 - a longitudinal section of a thrust bearing with hydrostatic pockets located on the heel side, with the conjugation of an annular thrust bearing and the housing on a spherical surface;

in FIG. 11 shows a longitudinal section of a thrust bearing with hydrostatic pockets located on the side of the housing, with the conjugation of the annular thrust bearing and the housing on a spherical surface.

The thrust sliding bearing contains a heel 1, an annular thrust bearing 2 with fixed pillows 3, a housing 4, tapering radial channels 5 for supplying lubricant to the fixed pillows 3 and hydrostatic pockets 6. The fixed pillows 3 have a wedge-shaped profile and form wedge gaps 7 with the fifth (Fig. . four). The annular thrust bearing 2 is made with an inner annular channel 8 communicated by the outlet holes 9 with a wedge gap 7 and the inlet holes 10 to the hydrostatic pockets 6. The outlet holes 9 are made with a larger diameter than the inlet holes 10. The heel 1 on the rotor is fixed with a nut 11 and a key 12 , the annular thrust bearing 2 is fixed relative to the housing 4 by a pin 13. The annular channel 8 is made by a bore of the annular thrust bearing, followed by the installation of the sleeve 14 in a tight fit. In order to quickly increase pressure in hydrostatic pockets 6, the volume of the annular channel 8 should be small, for the same reason the outlet openings 9 are made of a larger diameter in comparison with the inlet openings 10. The bearing capacity of the hydrostatic pockets 6 (Rc) is ensured by their area (F) and static the pressure in the pockets (pc), which is determined by the diameter of the supply holes 10. The lubricant is supplied to the fixed cushions 3 and wedge gaps 7 through radial channels 5 (Fig. 3), which taper from the center periphery for reducing the flow of lubricating fluid.

Hydrostatic pockets 6 of a thrust sliding bearing can be located on the annular thrust bearing 2 from the heel side 1, between the fixed cushions 3 (Fig. 1-5), or on the annular thrust bearing 2, from the side of the housing 4 (Fig. 6-10) With the last arrangement thrust bearing has a higher bearing capacity, because hydrostatic pockets 7 of a larger area (F) can be arranged (FIG. 8).

Hydrostatic pockets 7 are equipped with sealing elements 15 (Fig. 5, 9), working on friction, for example, various graphite compositions, which will reduce the consumption of lubricating fluid to a minimum.

An annular thrust bearing 2 in conjunction with the housing 4 can be performed on a spherical surface 16 (Fig. 10, 11). This design is used for large skews of the heel 1 mounted on the rotor relative to the housing 4.

The thrust bearing operates as follows.

Lubricating fluid is supplied through channels 5 (in Fig. 3, arrows indicate the directions of motion of the lubricating fluid), then the mechanism itself starts up. When the rotor of the mechanism rotates, an axial force P arises (Fig. 1), at the same time, when the heel 1 mounted on the rotor rotates, the lubricant from the channel 5 is entrained in the wedge gaps 7 (in Fig. 4, the arrow shows the direction of movement of the lubricant) . As a result, the pressure increases in the gaps 7 (it can reach 10 MPa or more) and due to the appearance of the hydrodynamic effect, the bearing capacity of the bearing appears. Then, through the outlet holes 9 connecting the wedge gaps 7 and the annular channel 8, the lubricant flows under pressure into the hydrostatic pockets 6 through the holes 10, and an additional bearing capacity due to the hydrostatic effect arises, described by the equation: Rc = n × F × pc, where n is the number of hydrostatic pockets, F is the area of hydrostatic pockets, pc is the pressure in hydrostatic pockets. As a result, the bearing capacity R of the bearing is created (Fig. 1), both due to the occurrence of a hydrodynamic effect, and due to the occurrence of a hydrostatic effect.

Thus, the proposed solution, by improving the design of the thrust bearing, allows to increase the bearing capacity of the thrust bearing without the use of external sources of pressure of the lubricating fluid.

Claims (5)

1. A thrust sliding bearing containing a heel, an annular thrust bearing with fixed pillows having a wedge-shaped profile, forming wedge gaps with a fifth, a housing, tapered radial channels for supplying lubricant to the fixed pillows, and hydrostatic pockets, characterized in that the annular thrust bearing is made with an annular channel communicated with wedge gaps by the outlet openings and with hydrostatic pockets by the inlet openings, while the outlet openings are made with a larger diameter than the diameter inlet holes. 2. Thrust sliding bearing according to claim 1, characterized in that the hydrostatic pockets are located on the annular thrust bearing on the heel side, between the stationary cushions. 3. Thrust sliding bearing according to claim 1, characterized in that the hydrostatic pockets are located on the annular thrust bearing from the side of the bearing housing. 4. Thrust sliding bearing according to claim 1, characterized in that the hydrostatic pockets are equipped with sealing elements. 5. Thrust sliding bearing according to claim 1, characterized in that the annular thrust bearing is mated to the housing on a spherical surface.

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