DE2055014A1 - Radial groove bearing - Google Patents

Description

Patent Attorneys' 2055014 Dipl.-Ing. W. Beyer Dipl.-Wirtsch.-Ing. B. Jochem

Frankfurt am Main Freiherr-vom-Stein-Str.

In matters:

SKF Industriele Handel-en
Ontwikkeling-Maatschappij NV
Overtoom 141-14-5
Amsterdam / Holland "

Radial groove bearing

Priority of the Swedish patent application No. 15 865/69 of November 19, 1969

The invention "relates to a spiral groove bearing" consisting of a number of flat grooves separated by ridges that form an annular, flat or curved surface of revolution cover.

Spiral groove bearings are relatively new hydrodynamic plain bearings for taking up preferably pressure loads. Their sliding surfaces can be flat, spherical or conical. Such bearings have one of their sliding surfaces flat spiral grooves. A so-called ridge runs between each two grooves. The one along an arc of a circle measured width of the grooves and the ridges is generally the same.

The edge lines between the grooves and webs are designed as logarithmic spirals. A characteristic The characteristic of the execution of the cure is that that the angle q £ between the curve and the circular

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tangent always remains the same along the entire course of the curve. This will make the distance between two Spirals delimiting a groove are considerably larger at the periphery of the spiral groove surface than in the center.

In practice, however, such a change in the groove width, as occurs in this known design, proved disadvantageous. The number of grooves - which are as large as possible because of the load absorption should be - is determined by the available distance to the center point. Especially with small spiral groove bearings, which generally consist of a steel ball and a spherical shell, the latter in theirs Inner surface has the spiral grooves, the number of the groove can increase for the spatial reasons mentioned be low.

The object of the invention is to create a spiral groove bearing which is sufficient even with small dimensions has many spiral grooves. According to the invention this object is achieved in that the width of the Grooves and ridges of the spiral groove arrangement along its course from the outer to the inner hand zone in the is essentially constant.

In such a bearing according to the invention, in which the angle ⁰ ° decreases continuously from the central region, has several advantages.

Once a larger angle can be selected in the central area, which increases the number of Grooves made possible without the width of the grooves and ridges becoming too small. Furthermore ^ enables this Arrangement the choice of the most advantageous ° C value in the outer part of the groove surface, which under the

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The point of view of the load absorption which is of essential importance. These facts make an essential increased load capacity of the bearing, which is extremely important. In addition, is manufacturing the spiral grooves in the sliding surfaces easier in the embodiment according to the invention. A quick and is a reliable method for working the spiral grooves in a large number of such bearings the embossing. The webs of the punch produce the grooves in the bearing surface, whereas the grooves in the punch the bars in the warehouse result. It is easy to understand that a spiral groove design ^ uit constant land and Groove width can be produced quickly and easily with this method. Engraving a specific Number of grooves of equal width in the punch is a simple process through which the following Embossing of grooves of the same width in storage areas is guaranteed. However, this is not the only one Process for the production of groove surfaces a "! Also with the help of other common processes i ^ :. jien the webs and grooves according to the invention of the same width in bearing elements of the most varied types and on the most varied Material to be incorporated.

In the drawing, a groove design is shown, whose spiral curves are given by the equation o £ = aresin

• * χ sin o {y) is determined.

In this equation:
r any radius
r is the largest radius of this version

oL and o / _T the angle between the curve and the

Tangent to the circle with radius r or to the circle with radius r.

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With a compass and ruler, a spiral curve can easily be constructed that is closed enough around the above To satisfy the equation and the spiral grooves with the invented

¹ ι

results according to the advantages. An example is shown in the drawing. A number of concentric circles 1 are drawn in at the same distance from one another. Several radial rays 2 evenly distributed over the circumference start from the center of the circle and subdivide the circular area into narrow segments. The desired curve shape can be constructed by continuously connecting the diagonal corners 3 and 4 ″ of the segments. The distance between two adjacent curves 5 and 6 is always constant. The grooves and webs of the embodiment shown in the drawing are designated a and b .

Expectations/

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Claims (3)

Expectations Spiral groove bearing, consisting of a number of flat grooves separated by webs, which form an annular, cover flat or curved hotation surface, characterized in that the width of the grooves and webs of the spiral groove arrangement is longitudinal their course from the outer to the inner edge zone is essentially constant. 2. spiral groove bearing according to claim 1, characterized in that the edge line between a groove and a land of the equation aresin ^ L _{x sin} enough. 3. spiral groove bearing according to claim 1, characterized in that the edge lines between the grooves and the ridges pass through diagonal corners of segments that are defined by concentric circles of the same Intermediate distance and radial rays evenly distributed over the circumference are formed. SK? 8153 / 6.11.1970 109835/0950 Blank page