SU1539411A1 - Method of securing polymer on bearing metal housing - Google Patents

Abstract

The invention relates to mechanical engineering, namely to sliding bearings. The purpose of the invention is to increase the bearing life by increasing the reliability of the mounting of the polymer on the metal housing. On the inner cylindrical surface of the bearing housing, rectangular grooves are cut to form rectangular screw protrusions. Then in the middle of the projections cut the groove of the triangular profile. In this case, the walls of the protrusions are folded inwardly into the grooves of rectangular cross section. The latter are partially rolled in this way. Rolling is due to the expanding force of the cutter, which bends the thinned upper side sections of the screw lugs to the sides. After cutting the grooves, the bearing housing is placed in a mold, where all voids are filled with polymer. By analogy, make a flat bearing. Grooves planed in the radial direction. The method allows the radial bearing sleeve to be cut to obtain a bearing with a partial angle of coverage without any possible detachment of the polymer at the cutting site and, in addition, to make flat bearings with reliable fixing of the polymer on the bearing housing. 3 hp f-ly, 5 ill.

Description

The invention relates to mechanical engineering, namely to sliding bearings.

The aim of the invention is to increase the bearing life by increasing the reliability of attachment of the polymer to the metal housing.

Fig. 1 shows the moment of making the groove of the triangular profile on the inner surface of the screw lug of the liner sleeve; figure 2 - the execution of two Kank triangular

profile; on fig.Z - sleeve with polymer on the inner surface; figure 4 - grooves of the support bearing segment, a view in plan; figure 5 - section aa in figure 1.

The method is carried out as follows.

If the bearing housing 1 (Fig. 1) is a sleeve, then on its inner cylindrical surface, firstly, a helical groove 2 of rectangular section is cut, forming helical protrusions 3. After that, in the middle part of the projections 3, a helical groove is cut at 4 triangular profiles. The arrow on the cutter 5 indicates the direction of its movement when cutting the helical groove 4. When cutting the groove 4, the walls of the screw protrusions 3 are folded inward into the grooves 2 of rectangular section. The latter are partially rolled in this way. Rolling occurs because when cutting the screw grooves 4 of the triangular profile cutter 5 due to its arching force bends the thinned upper side sections 6 of the screw protrusions 3.

By analogy with that described on the screw lugs 3 (Fig. 2), two parallel screw grooves 4 are cut. This also results in partial rolling of the grooves 2 by bending around the side portions of the 6-screw lugs 3. Cutting the screw grooves 4 in this design is made t sequentially: first one, then the second, as shown in figure 2. The number of grooves 4 should not be more than two, since each of the grooves 4 bends only one side of the protrusion 3. The use of two parallel grooves 4 is advisable in the case of a wide protrusion 3. A larger number of grooves 4 on the protrusion 3 does not give a greater effect in bending the side sections 6. For example, when making three grooves 4 on the protrusion 3, the middle of three does not give any positive effect, since it does not participate in the folding of the side sections 6.

After cutting the helical grooves 2 and 4, the housing 1 (Figures 1 and 2) is placed in a mold and the polymer is filled with pressure 7 to fill all the voids obtained by cutting the grooves 2 and 4. Finally, the polymer 7 is bore to the required diameter and receive in this way a radial bearing (fig. 3).

Fundamentally, the grooves can be not screw, but annular, i.e. performed with some step and unrelated. The proposed method remains unchanged.

According to the described method, an annular compact baffle is manufactured, for example, for small

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sos, turbines, etc. The grooves are annular.

In the manufacture of a large-sized large-size bearing, for example, a subgun segment of a hydraulic unit (FIGS. 4 and 5), the grooves 2 and 4 are cut in the radial direction by planing or milling. Then, a layer of polymer 7 is applied to the segment on the segment. The expediency of making grooves 2 and 4 in the radial direction for multimeter diameter pads is dictated by the inability to perform concentric grooves 2 and 4 of small dimensions on large rotary walls due to tool breakages. Therefore, the blanks in the form of a ring are cut into segments and parallel grooves are made in them in the radial direction. In addition, this transverse direction of the grooves increases the strength of fixing the polymer 7 on the housing 1.

As the material for the bearing housing 1, choose a material with fluid properties. Such material is ductile, well deformed and rolled. These materials include aluminum, its alloys, low carbon steel, etc.

The method makes it possible to securely fix the polymer on the metal bearing housing, as well as cut the sleeve of the radial bearing in order to obtain a bearing with a partial angle of coverage without possible delamination of the polymer in operation at the cut point, which leads to an increase in the bearing life.

Claims (4)

1. A method of fixing a polymer on a metal bearing housing, including the execution of rectangular and triangular grooves on the side of the friction surface, filling the grooves and the bearing housing surface with polymer, so that, in order to increase the bearing life by increasing the reliability of the fastening of the polymer on the metal casing; the grooves of the triangular profile are made between the grooves of the rectangular profile parallel to them, and between two grooves of the rectangular section 5153941 No more than two grooves of the triangular profile are made, and the material with bearing properties is used as the bearing material. 2. A method according to claim 1, characterized in that, in order to increase the life of the radial bearing, the grooves of the rectangular and triangular profiles are screw-shaped. 0 sixteen 3. A method according to claim 1, characterized in that, in order to increase the life of the radial bearing, the grooves of the rectangular and triangular profiles are annular. 4. A method according to claim 1, characterized in that, in order to increase the resource of the bogie, the grooves are made in the radial direction. FIG. one 7TTTT7T pЈ / g. 2 fig- b Fi.Z