RU1775566C - Sliding bearing shell - Google Patents

Abstract

Use: highly loaded sliding bearings. SUMMARY OF THE INVENTION: A solid anti-friction alloy with local grooves is fixed to the working surface on the base. A soft anti-friction alloy is placed in the channels. The grooves are made at an angle a to the sliding direction of 15 [deg.], And with a center distance of not more than 10 mm. In the middle part of the working surface of the liner on a solid antifriction alloy, a smooth section is made with a width not exceeding 15 mm. 2 ill.

Description

The invention relates to devices for the normal operation of machines, and more specifically to plain bearings, and can be used in heavily loaded engines.

Known liner sliding bearing containing a base made of steel, on the inner surface of which are fixed two anti-friction alloys. One of them is solid and solid based on aluminum or copper. The other is made of a soft antifriction alloy such as babbitt located in grooves made on the surface of a solid antifriction alloy with an interaxial distance not exceeding 10 mm at an angle a to the sliding direction of 15 °. The layer of soft antifriction alloy is designed to provide a running-in of the working surface of the liner with the neck of the shaft and the absorption of foreign bodies.

However, as a result of crushing the grooves to their full depth, resulting from the running-in process of the liner working surface, which is formed when the generatrix of the shaft neck is misaligned with the liner generatrix, the role of the grooves loses its purpose and the wear of the shaft-bearing pair increases.

The aim of the invention is to increase the durability of the bearing shell by reducing the crease of the grooves while running in the running surface of the bearing shell.

This is achieved by the fact that in the liner of a sliding bearing containing a base with an antifriction alloy fixed on it, made with local grooves on the working surface in which the soft antifriction alloy is placed, the grooves are made at an angle a to the sliding direction of 15 °, and The center distance not exceeding 10 mm in the middle part of the liner working surface on a hard antifriction alloy is a smooth section with a width not exceeding 15 mm.

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In FIG. 1 shows a plain bearing shell with a smooth portion of a non-hard anti-friction alloy, in cross section; in FIG. 2 is a scan of the working surface of the bearing shell of FIG. 1.

The plain bearing insert contains a base (frame) 1 made of steel, on the inner surface of which two antifriction alloys 2 and 3 are fixed. Alloy 2 is solid (based on aluminum or copper) and solid. Alloy 3 is soft (such as babbitt) and placed in grooves 4, the surfaces of which are coated with an intermediate layer 5, for example, based on nickel. The grooves 4 are made on the surface of the hard antifriction alloy 2, at an angle a to the sliding direction of 15 °, and with an interaxial distance not exceeding 10 mm. Alloy 3 is intended to provide anti-seize ability, run-in of the working surface of the liner with the neck of the shaft and the absorption of foreign bodies. In order to increase the durability by reducing the crease of the grooves 4 in the running-in mode of the working surface of the liner in its middle part, a smooth section 6 is made on the hard antifriction alloy 3, with a width not exceeding 15 mm.

The width of the smooth portion 6 is determined empirically depending on the diameter

the neck of the crankshaft, the width of the liner and the accuracy of the thickness of the liner wall and the diameter of the neck of the shaft.

The running-in of the working surface of the liner with a smooth section with the neck of the shaft occurs to a depth of 0.02 mm at an angle of contact of the neck of the shaft with the generatrix of the inner surface of the liner, equal to 51-6. With this type of running-in, the contact of the shaft neck with the surface of the shaft increases and a smooth section comes into operation. Such liners are used in tractor and combine harvesters with a high load with a sliding speed of not more than 25 m / s.

Claims (1)

SUMMARY OF THE INVENTION A plain bearing insert comprising a base with a solid anti-friction alloy fixed to it, made with local grooves on the working surface, in which the soft anti-friction alloy is placed, the grooves are made at an angle a to a sliding direction of 15 ° and have a center distance of not exceeding 10 mm, characterized in that, in order to increase durability by reducing the wrinkling of grooves in the running-in mode of the liner working surface, in the middle part of the liner working surface on House antifriction bearings made smooth section width not exceeding 15 mm. 0US./ FIG. 2