DE1269843B - Pressure fluid lubricated slide bearing arrangement for wheel shafts - Google Patents

Description

Hydraulic fluid lubricated slide bearing arrangement for wheel shafts The invention relates to a pressure-lubricated slide bearing arrangement for wheel shafts.

Bearing shells made of swellable material are just as known per se the arrangement of ring and axial grooves.

The object of the invention is, with the aid of these construction means a bearing for drive shafts of pumps, suction heads, excavators or agitators create in which the liquid film located between the bearing shell and the shaft hub does not tear off even with high bearing loads and thus an increased service life of the Warehouse guaranteed.

The invention is better known per se through the combination of the following Features marked that are only claimed in this combination.

a) The bearing shell is made of swellable material, such as synthetic Resin, b) it has in the middle part and in both sleeve parts of the inner wall Annular grooves, which are connected to each other by a multitude of narrow, flat, axially extending Grooves are connected that shortly before they open into the annular grooves of the sleeve parts run out at a certain angle to the axial direction of the bearing shell, the The annular groove of the central part has an inlet for the pressure fluid, c) the wheel shaft is inside the bearing shell with a hub that is finely machined on its surface Mistake.

The design according to FIG. 1 to 3 were used for excavator shafts. The construction according to FIG. 4 meets all expectations, i. i.e., she owns significantly longer service life than previously known types.

A cast steel hub is denoted by B in the drawing (FIG. 1). It is shrunk onto a drive shaft that works in the dirty water. These The shaft hub is therefore honed and chrome-plated. Meanwhile, the bearing shell A made of phenolic resin so that an annular groove A2 and a pair of annular grooves A3, As were provided in the middle part and on the inside of the cuffs, namely on the inner wall of the bearing shell A, while there is also a large number of flat ones Axial grooves A4 are provided (FIG. 1), which connect the three annular grooves A2, A3, A3 to one another connect (Fig. 3).

The middle ring groove A2 is connected to an inlet A1 for pressurized water, that is fed in from an external source. , The inventor brought one Bearings on the suction head cutting shaft of an excavator. Without repair or renewal held it for three years. A remarkable result compared to corresponding ones known bearings with bearing shells made of cast iron in connection with shrunk onto the shaft Cast steel hubs that only lasted a few months and seamless ones made of special rubber Bearings worn out within a year.

During an inspection for overtaking after one year of operation found that the bearing shell A was not worn all around in the middle part, d. H. where the shallow axial grooves A4 are provided, however, there was a substantial one Wear on the two cuff parts at A5, where there are no Axiahiuten A4 must be determined in order to maintain a film of liquid under sufficient pressure.

The inventor examined this wear on A5 on five units. The models were supplied with water under sufficient pressure and it was determined like the water through the free space - gap between the cuff partsAS the Bearing shell A and the shaft hub B - emerged while the shaft was rotating. It was found that only one of the models leaked water in a ring film while from all other the water came in bundles, which is the location of the neighboring narrow ones Axial grooves A4 corresponded (Fig. 3), although such grooves at the points at the sleeve parts A5 were not available. This experiment taught that the cuff parts A5 at their surface a processing require the highest precision, so that an exact liquid film is formed on it, and inevitably for Tend to wear if the film is not formed on A5.

The above-mentioned inspection showed that the bearing shell A on the middle part of the inner wall, where the axial grooves A4 are present, was not worn all around, that is, a liquid film had been formed between the bearing shell A and the hub B in the middle part, although they were on the surface were not finished with such high precision. Taking this fact into account, the inventor improved the sleeve parts A so that an "exact liquid film" was formed there over the surface, although it was not finely machined. For this purpose, the axial grooves A4 were given a shape bent at an angle at the point where they open into the annular grooves A3 A3 (FIG. 4).

The liquid film then flows into the annular groove A3 with the one described above predetermined angle, emerges during its circulation along the annular groove A3 and forms over the sleeve part AS and then also where there are no axial grooves A4 a liquid film while the liquid flows out of the axial grooves A4, to form such a film in the central part of the shell.

Another five test examples according to FIG. 4 proved that.

The bearing according to the invention was made into an excavator and a sand pump built-in. Test examinations did not confirm any noticeable within three years Wear. This justifies the conclusion that between the bearing shell and the shaft hub a film of liquid was always present; in other words: bearing shell and shaft hub did not come into direct contact with each other.

The "liquid film" was always between these two elements maintain.

This is the combination of two effects: One, that the There is sufficient film between the bearing shell A and the shaft hub B using liquid high pressure is formed from the flat axial grooves A4 around the central part flows out of the inner bearing shell wall and also from the annular groove A3 in the two sleeve parts A5 while the liquid circulates along the groove A3; on the other hand, that the liquid film has a sufficiently smooth surface of the shaft hub B flows while the gap between the bearing shell A and the shaft hub B is small is held because the former is made of swellable material, e.g. B. fiber containing phenolic resin is formed even in the case of direct contact with the latter in such sliding contact with this remains that the liquid is able to pass through the film steadily maintain.

According to the invention, the shaft runs with the lowest friction because the system fluid between the shaft and the bearing is mixed with oil. Therefore guaranteed the pump runs reliably, with a sufficiently high degree of efficiency without leaks, which is particularly important when pumping chemical liquids.

The bearing can also be used for double suction pumps. The inventive Bearings can be used with success for drive shafts of small portable pumps as well as for large star tubes of vessel propellers, no matter for which liquids, Water, sea water, dirty water, chemical liquids or the like.

Claims (1)

Claim: Slide bearing arrangement for hydraulic fluid lubricated Wheel shafts, characterized by the combination of the following well-known features: a) The bearing shell (A) consists of swellable material such as synthetic resin, b) it points in the middle part and in both sleeve parts (A5) of the inner wall Annular grooves (A2, A3), which are connected to one another by a large number of narrow, flatter, axial running grooves (A4) are connected, which shortly before they open into the annular grooves the sleeve parts at a certain angle to the axial direction of the bearing shell run out, the annular groove (A2) of the central part having an inlet (A1) for the pressure fluid has, c) the wheel shaft is inside the bearing shell with one on its surface finely machined hub (B). Publications considered: German Patent Nos. 589 534, 832 968; British Patent No. 400,544; magazine des V. D. J., No. 36, of December 21, 1954, pp. 1197 to 1206.