SU1636609A1 - Plain bearing - Google Patents

Abstract

The invention relates to mechanical engineering and can be used in slide bearings. The purpose of the invention is to increase durability. The sliding bearing includes bearing sleeve 1, anti-friction liner 2 and shaft lining 3. Anti-friction liner 2 is installed between the support sleeve 1 and shaft lining 3. The coefficient of linear expansion of the material of the anti-friction liner 2 is less than the linear expansion coefficients of the materials of the bearing sleeve 1 and the shaft lining 3. In the process bearing operation, the liner 2 rotates in the forward or reverse pair mode. 1 hp f-ly, 1 ill.

Description

The invention relates to mechanical engineering and can be used in sliding bearings.

The purpose of the invention is to increase the durability of the plain bearing. 5

The drawing shows a bearing, a section in a perspective view.

The sliding bearing contains a support sleeve 1 with an anti-friction liner 2 installed in it, made of 10, for example, of pressed wood with a density of 1200–1300 kg / m ³ and humidity 0–1%. The inner surface of the liner 2 is in contact with the lining of the shaft 3. The liner 2 contains 15 antifriction filler, for example, graphite. To prevent axial displacement of the liner 2, the support sleeve 1 and the shaft lining 3 can be made with collars 4. The gap between the support sleeve 1 20 and the liner 2, as well as between the liner 2 and the shaft lining 3, is made as close to zero as possible. The linear expansion coefficient of the liner 2 is approximately 8-10 times less than 25 linear expansion coefficients of the support sleeve 1 and the shaft lining 3.

The sliding bearing works as follows.

In the initial period, rotation 30 occurs between the liner 2 and the shaft lining 3, since the contact area on the inner surface of the liner 2 is less than on the outer surface. With rotation, the temperature in the friction zone increases and the diameter of the shaft 3 of the cladding increases (an increase in the diameter of the liner is 10 times less). As a result of this, the gap between the liner 2 and the lining of the shaft 3 disappears, i.e. an interference appears between them. Further rotation between the liner 2 and the lining of the shaft 3 becomes impossible, therefore sliding occurs between the liner 2 and the support sleeve 1. The heat generated is removed through the shaft. At 45, due to the poor thermal conductivity of the liner 2, the temperature in the friction zone between the liner 2 and the supporting sleeve 1 increases, and in the contact zone of the liner 2 and the shaft lining 3 decreases. The heat generated 50 is removed through the housing. Due to the increase in temperature in the friction zone of the pair of liner 2 - support sleeve 1, the linear expansion of the support sleeve 1 occurs, leading to the disappearance of the gap between the liner 2 and the support sleeve 1, i.e. to the appearance of interference. At the same time, the lining of the shaft 3 cools down and a gap appears between the liner 2 and the lining of the shaft 3. As a result, the rotation occurs between the pair of the liner 2 of the lining of the shaft 3. The process is repeated. When switching from the rotation of the liner 2 from the work of the direct pair to the work of the return pair and vice versa, 15 simultaneously rotates between the liner 2 and the lining of the shaft 3, and between the liner 2 and the supporting sleeve 1.

Thus, uniform heat dissipation is ensured both through the shaft and 20 through the friction unit body and the thermal decomposition of wood is excluded, which increases the bearing durability. This also allows you to increase the operating temperature of the friction unit from 90 to 1.45 ° C. In addition, since the 25 anti-friction liner of pressed wood is rubbed by both the inner surface and the outer, the bearing life is extended.

Claims (2)

30 claims 1. A plain bearing comprising a support sleeve and an anti-friction liner installed therein with an inner female surface for facing 35 shaft, characterized in that, in order to increase durability, the support sleeve, antifriction liner and shaft lining are made of materials whose linear expansion coefficients are selected 40 from the following ratio: Κι * ’Kg * C3, where Κι is the coefficient of linear expansion of the material of the support sleeve; Kg - linear expansion coefficient 45 of the material of the antifriction liner; KZ - the coefficient of linear expansion of the material of the shaft lining. 2. The bearing according to claim 1, distinguished by the fact that the antifriction liner is made 50 nn of pressed wood with a radial arrangement of fibers.