Thrust bearing

Abstract

The utility model relates to mechanical engineering, in particular to segmented thrust plain bearings, and can be used, for example, in the designs of thrust bearings used in rotary machines. The thrust bearing includes a base (1) on which segments (2) are mounted. Each segment (2) of the thrust bearing includes a working surface (2.1) with a protective coating (2.2) applied to it, wherein the thickness of the segment's protective coating is in the range from 0.3 to 2 mm. The protective coating (2.2) is made of polyetheretherketone with the addition of graphite and Teflon. The technical result of the claimed utility model is to increase the service life of the thrust bearing segment. 1 c.p. fils, 2 figs.

Description

[0001] Technical field

[0002] The utility model relates to the field of mechanical engineering, in particular to thrust plain bearings with segments, and can be used, for example, in the designs of thrust bearings that are used in rotary machines.

[0003] Technology Level

[0004] A thrust bearing segment is known from the prior art, including a working surface (see SU 188229 A1).

[0005] The technical problem inherent in the given analogue is the low service life of the thrust bearing segment.

[0006] This technical problem is caused by the fact that the segment is made without any protective coating.

[0007] The absence of a protective coating on the working surface of the thrust bearing segment reduces its service life.

[0008] The closest analogue is the thrust bearing segment, which includes the working surface (see SU1467261A1).

[0009] The technical problem inherent in the given analogue is the low service life of the thrust bearing segment.

[0010] This technical problem is caused by the fact that the segment is made without any protective coating.

[0011] The absence of a protective coating on the working surface of the thrust bearing segment reduces its service life.

[0012] Essence Revealed

[0013] The technical result of the claimed utility model is an increase in the service life of the bearing.

[0014] The stated technical result is achieved by the following design of the thrust bearing.

[0015] A thrust bearing consists of a base on which segments are mounted. Each thrust bearing segment has a bearing surface with a protective coating. The segment itself can be made of carbon steel or some other steel.

[0016] The protective coating applied to the working surface of the segment is made of polyetheretherketone with the addition of graphite and Teflon.

[0017] Due to the fact that a polyetheretherketone coating is used with the addition of graphite and Teflon, the service life of the thrust bearing segment is increased.

[0018] The service life of the thrust bearing is increased due to the fact that by adding graphite and Teflon to the protective coating of each segment, the mechanical strength, wear resistance, hardness, and resistance to high temperatures are increased, which together and individually contribute to an increase in the service life of the thrust bearing.

[0019] Also, the use of polyetheretherketone with the addition of graphite and Teflon reduces the coefficient of friction of the working surface of the segment, which also contributes to an increase in service life.

[0020] In the preferred embodiment of the design, before applying the protective coating, the working surface of the segment is processed to a roughness Ra in the range of 3.2 μm to 6.3 μm. This roughness range is optimal, since with a roughness Ra value of less than 3.2 μm, the adhesion of the protective coating and the working surface of the segment will be poor, which reduces the service life of the thrust bearing segment. Moreover, a roughness of the working surface with a Ra value greater than 6.3 μm also contributes to a reduction in the service life of the thrust bearing segment due to the fact that with higher roughness it is necessary to increase the thickness of the protective coating, which increases the likelihood of crack formation, as well as the porosity of the protective coating.

[0021] Also, in the preferred embodiment, the working surface of the thrust bearing segment is degreased before applying the protective coating, which improves the adhesion of the protective coating and, consequently, increases the service life of the thrust segment as a whole. The protective coating is applied with a thickness of 0.3 to 2 mm.

[0022] The specified range of protective coating thickness is optimal, since test results have shown that when the protective coating thickness is less than 0.3 mm, rapid wear of the coating occurs, which reduces the service life of the thrust bearing segment, and when the protective coating thickness is greater than 2 mm, the likelihood of cracks in the coating during operation increases, which also reduces the service life of the thrust bearing segment.

[0023] The protective coating can be applied to the working surface of the segment, for example, by plasma spraying (or some other method).

[0024] After applying a protective coating to the working surface, the segment is used as part of a thrust bearing.

[0025] All of the above design features, both individually and together, contribute to increasing the service life of the thrust bearing segment and achieving the stated technical result.

[0026] Brief description of drawings

[0027] The claimed utility model is explained by illustrative material, where Fig. 1 shows a general view of a thrust bearing; Fig. 2 shows a general view of a segment of a thrust bearing.

[0028] The following structural elements of the thrust bearing segment are designated by the positions on the figures:

[0029] pos. 1 - thrust bearing base;

[0030] pos. 2 - thrust bearing segment;

[0031] pos. 2.1 - working surface of the thrust bearing;

[0032] pos. 2.2 - protective coating of the thrust bearing segment;

[0033] Implementation of a utility model

[0034] The claimed utility model is implemented as follows.

[0035] The thrust bearing includes a base 1 on which segments 2 are mounted.

[0036] Each segment 2 of the thrust bearing includes a working surface 2.1 with a protective coating 2.2 applied.

[0037] Protective coating 2.2 is made of polyetheretherketone with the addition of graphite and Teflon.

[0038] Protective coating 2.2 is applied as follows.

[0039] A layer of polyetheretherketone with the addition of graphite and Teflon with a thickness of 0.3 to 2 mm is applied to the working surface 2.1 of segment 2, which has been pre-treated to a roughness of Ra in the range from 3.2 µm to 6.3 µm and degreased, made, for example, of carbon steel, using the plasma spraying method (or some other method).

[0040] The resulting protective surface 2.2 is then ground to a roughness of Ra in the range of 0.4 to 0.8 μm and subjected to heat treatment for crystallization.

[0041] The resulting segment with a protective coating is then used as part of a thrust bearing, which is installed, for example, in a rotary machine.

[0042] The claimed utility model can be used in the design and manufacture of thrust bearings.

Claims

1. A thrust bearing comprising a base on which segments are mounted, each of which comprises a working surface with a protective coating applied, characterized in that the protective coating is made of polyetheretherketone with the addition of graphite and Teflon, while the thickness of the protective coating of the segment is in the range from 0.3 to 2 mm.

2. A thrust bearing according to claim 1, characterized in that the working surface of the segment is processed before applying the coating to a roughness value Ra in the range from 3.2 μm to 6.3 μm.

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