SU1390452A1 - Sliding-contact radial bearing - Google Patents

Abstract

The invention relates to the field of mechanical engineering and can be used in ton-loaded friction units of transport and lifting machines. The goal is to increase wear resistance and bearing capacity when operating in the boundary lubrication mode. The sliding bearing includes a housing with a set of floating bushings installed therein. The number of bushings is 3-5, and their sizes are related to certain ratios. With a sharp increase in the load in the bearing, the mode of operation on the verge of stable friction is realized, spots of nominal contact are formed, oil desorption occurs and the moment of friction increases. 1 il.

Description

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The invention relates to mascara and can be used in; tons of heavily loaded knots friction transport and lifting machines.

The aim of the invention is to increase wear resistance and bearing capacity when operating in the boundary lubrication mode.

The drawing shows a radial sliding bearing.

The sliding bearing comprises a housing 1 with split floating sleeves 2-4 and an oiler 5 arranged concentrically therein. An oiling hole 6 is provided in the sleeves for lubrication. The thickness of the floating sleeves in order of number, counting from the shaft, is reduced. The thickness closest to the surface of the sleeve sleeve is

h

. ,, (2,75-8,15). h, / h ,,,, 1.8-2,6, where i 1,2,3,4 - sleeve number, sci

that length of the sleeves is equal

from the shaft. L (0.8-2.2) D. The number of floating sleeves is 3-5.

The bearing works as follows.

At the initial moment of rotation, the shaft slips against the surface of the floating sleeve 2, then sleeve 2 relative to sleeve 3, and sleeve 3 relative to sleeve 4 and sleeve 4 relative to housing I. With a sharp increase in load on the bearing, an increase in pressure and temperature disturbances causes an increase in torque friction. Increasing the moment of friction sliding of sleeve 2 relative to the shaft above the moment of friction of sleeve 2 relative to sleeve 3 stops sliding of sleeve 2 relative to the shaft. Depending on the magnitude of the friction moment, further slippage occurs relative to the outer and inner surfaces of the floating sleeves 3 and 4.

or the surfaces of the housing 1. In this case, the discontinuities of the oil film on the inner surface of the sleeve 2, caused by the increase in temperature during sliding, are gradually healed. This is facilitated by the free lubricant reserve in the bearing, which is inserted during assembly and fed through the lubricator 5. The moment of friction of the shaft relative to the sleeve 2 decreases, and it also begins to rotate.

Thus, with a sharp increase in the load in the bearing, the mode of operation on the verge of stable friction is realized: spots of nominal contact form, the temperature of which is close to the critical dp of contact conditions, oil desorption occurs on a relatively large area of these spots and friction increases, but The pick does not occur.

Claims (1)

Invention Formula A radial sliding bearing comprising a housing with floating bushings fixed against axial movement, concentrically mounted in it of split length with axial movement, lubrication holes, and perpendicular working surfaces, characterized in that, in order to increase bearing capacity and wear resistance during operation boundary lubrication, the number of bushings is 3-5, and their dimensions are determined by the following ratios; of five 0 L h h h.  (0.8-2.2) 0; , (2.75-8.15) - 1.8 - 2.6, 10 D; Where 1 + 1 D h - L shaft diameter; the number of the insert, counted from the sliding surface; sleeve thickness; sleeve length