SU1300213A1 - Hydraulic machine guiding bearing - Google Patents

Abstract

The invention relates to the field of mechanical engineering and can be used in sliding bearings with water lubrication. The aim of the invention is to increase reliability and durability. The segments are mounted on supports by means of at least two rollers whose axes are parallel to the axis of the shaft. This design eliminates the deformation of the segment, its rapid wear and close to the shaft. 4 il.

Description

1. 13

The invention relates to mechanical engineering and can be used in supports with water lubrication.

The purpose of the invention is to increase the reliability and durability of the bearing,

FIG. 1 shows a sub-view; in fig. 2 shows section A-A in FIG. one; in fig. Figures 3 and 4 show pressure equalization schemes on the working surface of the segment.

The display in FIG. 1 and 2, the bearing consists of body 1, segments 2, its working surface pressed to the shaft 3, supports 4 of segment 2, rollers 5. The latter interact with support grooves 6 on the back surface of segments 2 and with support grooves 7 on the counter surface of supports 4. The forming grooves 6 and 7 are located in planes perpendicular to the axis of the shaft 3. The supports 4 of the segments 2 are attached to the body 1 by pins 8. The radial clearance between the segments 2 and the shaft 3 is adjusted by varying the thickness of the gasket 9.

Dp to ensure a better fit of the segment to the shaft in height, the vertical cross section of the grooves 6 and 7 can be made along an arc of a circle, and the rollers 5 in this case are barrel-shaped, as shown in FIG. one.

In order to simplify the bearing manufacturing technology, the grooves 6 and 7 can be made with a rectangular vertical cross section, in which case the rollers 5 have a cylindrical shape.

FIG. Figures 3 and 4 show the diagrams of the forces acting in the subframe with its

bot.

FIG. Figure 4 shows a variant of a bearing with full alignment of the contact pressure between the segment and the shaft for which they are forming. the channels on the back surface of the segment are with the meridian plane passing through the center T5 of the hardness of the segment surface, angle 90-oi, whereot arctg (| Ucк + | l к).

The bearing works as follows.

When the shaft 3 beats due to the rolling of the rollers 5, the segment 2 moves in the horizontal direction after the shaft and at each moment of time is set so as to contact the shaft with all its working

32

surface that provides optimal conditions for the operation of the bearing.

For displacement of the segment, such a normalization of the normal pressure on the segment is sufficient so that the tangential component of the resultant becomes equal to the sum of the sliding friction force in the zone of contact between the segment and the roller rolling friction forces along the support grooves. In this case (as shown in Fig. 3), the resultant normal pressure force5 N moves to point A, the radius vector of which OA is located at an angle y to the vertical. Fig. 3 shows the position when all forces acting on a segment, including friction forces, are balanced. Decomposing the force P acting on the segment into the normal and tangential components, from the triangle of forces we have

F, p fN „

to w

f tfrei;

N P-cos (si; f P Coso6, where f | ii (. + Is the total coefficient of friction of the segment relative to the shaft (11 {. And rolling friction of the rollers in the grooves | U.

In order to prevent the segment harbor between the shaft and the support from occurring, the resultant forces of normal pressure should not exceed the boundaries of the rollers during the restructuring of the plot.

FIG. 4 shows a segment designed in such a way that in the equilibrium position the plot of specific pressures in the zone of contact of the segment with the shaft is completely uniform. The bearing grooves on the thirth surface of the segment and on the support are oriented in such a way that the meridian plane of its sliding surface passing through the center of the slide forms with them forming a 90 ° -oJ angle, where arctg (jlicK) is the total friction angle.

The coefficient of friction of steel over rubber does not exceed fl ((. 0.08. If we accept, 1 (U ,, then ((0.08 + 0,, 088; oii 5.

As can be seen from the above calculation, a sufficiently small redistribution of the normal pressures in the zone of contact between the segment and the shaft is enough for equilibration to occur. Hydromachine bearings are manufactured

3130

with 8–10 segments, so that the arc of coverage of one segment is no less than 40–30. Under these conditions, the arc required for the normal operation of the segment between the outermost rollers is sufficiently simple.

In order for the subapicorn to work, it is sufficient to install two rollers each between the smoke segment and its support. However, to reduce the contact stresses in the areas of contact of the rollers with the segment and with the support of the segment, the number of rollers may be increased.

fto,

34

Claims (1)

The invention of the hydraulic machine bearing bearing includes a body and a set of segments mounted on the supports by means of self-aligning support bodies, characterized in that, in order to increase reliability and durability, the self-aligning support bodies are made in the form of rollers, and on the back side of the segments facing them the sides of the support are made with grooves, the formation of which is perpendicular to the shaft axis and the profile of which corresponds to the shape of the rollers, while the rollers are placed parallel to the shaft axis in the said channels avkah. fPue.2 Nyprav / genius Offuufemif g / Vuz4 Editor M. Petrov Compiled by T. Khromova Tehred M. Hodannch. Order 1134/35 Edition 760 VShPI State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Proofreader. Shekmar Subscription