RU2484263C1 - Plain journal bearing - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: on horizontal connector of a bearing in lower and upper inserts, there made on both sides are pockets, in each of which a diaphragm is installed, which divides the pocket into two cavities which are not interconnected between each other, and one of which is intended for supplied cold lubricant, and the other one - for waste hot lubricant. The above cavities are interconnected with inlet and outlet channels made on outer surface of inserts. In an oil outlet channel of lower insert there are drain holes for removal of hot lubricant from the bearing. The diaphragm supplies cold lubricant flow through a downstream side tangentially for the rotor journal, and it cleans the rotor surface through an upstream side; as a result, hot lubricant is supplied to the upstream cavity of the pocket, discharged to an annular channel of the insert and removed from the bearing through drain holes. Closed outlet channels prevent hot lubricant washing-out of the bearing surface.

EFFECT: improving reliability, economy, reducing friction losses, reducing the required quantity of lubricant, simplifying the design and manufacturing technology.

6 cl, 4 dwg

Description

The technical solution relates to the lubrication of sliding bearings and, in particular, to the distribution of cold lubricant on the bearing surface of the sliding bearing and the removal of hot lubricant from the bearing surface and can be used in compressors, turbines, pumps and other devices with rotating shafts.

From the description of the invention to the USSR author's certificate No. 1506194 [1], the design of a thrust bearing is known, comprising upper and lower liners, a supply channel and a grease exhaust cavity. The disadvantage of this bearing is the incomplete solution to the problem of improving the thermal operating mode, since part of the spent hot lubricant, bypassing the exhaust cavity, is transferred to the working surface of the bore of the upper liner and then to the lower liner, where it is mixed with incoming cold grease.

From the description of the invention to the patent of the Russian Federation No. 2025584 [2] a pillow block bearing is known comprising upper and lower bushings, a supply channel and a grease exhaust cavity. The lower liner is equipped with end sealing chambers with a symmetrically located drain hole at the bottom and sealing rings, the grease outlet cavity is made in the form of a symmetrical wedge-shaped shape, behind which radial partitions are installed in the annular sealing chambers, the trailing edge of the drain hole is shifted towards the outlet of the used grease, and the bottom of the cavity grease drain is made oblique tangentially to the working surface of the lower liner. The disadvantage of this design is the complexity of the technology of its manufacture, since mechanical processing of structural elements of complex configuration on the inner supporting surface of the lower liner is required. The bearing design limits the use of anti-friction materials, in particular metal-fluoroplastic tapes, since the composite layer of the tape is not subject to mechanical processing.

The closest in design (prototype) is a plain bearing (US patent No. 5951172) [3], containing the upper and lower liners, between which pockets are formed. A lubricating element is installed in the pocket, made with a central through hole for supplying cold lubricant and having a comb for diverting hot lubricant to one or both end zones of the liners. Cold lubricant passing through the annular channel through the inlet openings made on one of the sides of each liner enters the upper and lower liners. Hot grease enters the space formed between the ends of the liners and the end sealing caps, from where it is discharged from the bearing through the drain holes.

The disadvantage of the prototype is the complexity of the design: a complex constructive solution of a lubricating element with a chevron and other configurations of the ridge and, as a result, the complexity of the manufacturing technology. As regards the temperature regime of the bearing, the following drawback is observed: spent hot grease discharged from the bearing support surface along the chevron or inclined faces of the ridges constantly washes the end surfaces, reducing the effect of bearing cooling.

The technical result is to increase reliability by improving the thermal regime of the bearing, economy by reducing friction losses and reducing the required amount of lubricant, as well as simplifying the design and manufacturing technology.

The technical result is achieved by the fact that on the horizontal bearing connector in the lower and upper liners, pockets are made on both sides, in each of which there is a diaphragm that separates the pocket into two cavities that are not communicating with each other, one of which is for incoming cold grease, and the other for spent hot grease. These cavities communicate, respectively, with inlet and outlet channels made on the outer surface of the liners. In the oil outlet channel of the lower liner, drainage holes are made for withdrawing hot grease from the bearing. The diaphragm downstream directs the cold flow of lubricant tangentially under the neck of the rotor, and the upstream side wipes the surface of the rotor, as a result of which the hot lubricant enters the upstream pocket cavity, is discharged into the annular channel of the liner and out of the bearing through drainage holes. Closed discharge ducts prevent the grease from flushing the bearing surface.

The diaphragm directs the flow of cold lubricant under the neck of the rotor, removes (wipes) a layer of hot lubricant from the surface of the rotor and directs it to the channel for drainage of lubricant. The diaphragm operation reduces friction power losses, reduces heating of antifriction material of the bearing and rotor.

This effect is achieved as a result of eliminating the mixing of cold and hot grease, as well as getting the used lubricant and portable rotor neck from the lower liner to the upper liner.

Brief Description of the Drawings

Figure 1. Frontal section of a General view of a plain bearing.

Figure 2. A cross-sectional view of a sliding bearing along an annular channel for supplying cold lubricant and along line AA in FIG.

Figure 3. A cross-sectional view of a sliding bearing along the annular channel of the outlet of the hot lubricant and along the line BB in figure 1.

Figure 4. An enlarged local view of the diaphragm made of two elements, according to a preferred variant of the invention.

The claimed technical solution allows to increase reliability by improving the thermal regime of the bearing, friction losses are reduced, the required amount of lubricant is reduced, the design and manufacturing technology are simplified, which makes the bearing more technological and economical.

As shown in figure 1, the sliding bearing consists of an outer casing 1, an upper liner 2 and a lower liner 3. At least one annular channel 4 for supplying cold lubricant and at least one annular channel are made on the peripheral surface of the liners 5 to discharge spent hot grease. According to a preferred embodiment of the invention, two annular channels 5 are formed on the liners, passing between the centrally located lubricant supply channel 4 and the ends of the liners. In the lower liner 3 also made drainage holes 6.

2-4, reference numeral 7 denotes a pocket formed between the upper 2 and lower 3 liners. In each pocket, a diaphragm 8 is installed, made either integral from one element, or consisting of elements 8 'and 8 ". The diaphragm 8 can be installed in any known manner - rigidly with a minimum clearance relative to the shaft neck 11 or with compression. The diaphragm 8 separates the pocket 7 into two separate cavities 9 and 10. The cavity 9 in FIGS. 2 and 4 is for supplying cold lubricant, and the cavity 10 in FIGS. 3 and 4 is for withdrawing hot lubricant. The diaphragm 8 element 8 'directs the flow of cold lubricant under rotor neck 11. Element 8 "of diaphragm 8, vyp Flax, for example, made of antifriction material and in contact with the surface of the neck of the rotor 11, erases the hot grease from the surface of the neck of the rotor 11 and leads it into the cavity 10. The cavity 9 through the groove 9 'communicates with the annular channel 4 for supplying cold lubricant, and the cavity 10 through the groove 10 'communicates with the annular channels 5 for the removal of hot grease

The bearing works as follows: cold grease is supplied in a known manner from the hydraulic system to the annular channel 4 for supplying cold grease, from which it enters the cavity 9 through the groove 9 'and goes under the rotor neck 11. At the outlet of the liner, the hot grease is erased by the 8 "element and enters the cavity 10 and is directed through the grooves 10 'into the channels 5 to drain the hot grease, after which it is removed from the bearing through the drain holes 6. Thus, cold grease is continuously supplied to each liner and hot grease is discharged.

Claims (4)

1. A pillow block bearing, comprising a housing, upper and lower liners, characterized in that at least one annular channel for supplying cold lubricant and at least one annular channel for discharging spent hot lubricant are made on the outer surface of the liners drainage holes, and in the connector between the inserts there is a pocket with a diaphragm installed in it, dividing the pocket into two cavities that do not communicate with each other, which open into the corresponding channels. 2. The bearing according to claim 1, characterized in that the diaphragm is made in the form of an integral element. 3. The bearing according to claim 1, characterized in that the diaphragm is made integral of two elements. 4. The bearing according to claim 1, characterized in that at least one of the elements making up the diaphragm is made of antifriction material.

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