SU1682662A1 - Plain bearing assembly - Google Patents

Abstract

The invention relates to mechanical engineering and can be used in the friction units of machines operating under heavy-duty conditions. The aim of the invention is to increase reliability by ensuring reliability and durability. The sliding bearing assembly, comprising a covered pin, a sleeve with a channel for supplying the working medium and a solid lubricating briquette with its pressing means, is equipped with bars installed with the possibility of longitudinal movement in parallel through radial holes made in the axle shaft and passing through its axis, and a weight secured at one end of the tg, and a solid lubricating briquette mounted at the other end of the tg and directed to the surface of the friction sleeve. The site provides the implementation of a rational, combined lubrication mode in accordance with the mode of operation of the machine. 1 hp f-ly, 2 ill. five

Description

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The invention relates to mechanical engineering and can be used in the friction units of machines operating under heavy-duty conditions.

The aim of the invention is to increase reliability by ensuring reliability and durability.

FIG. 1 shows the proposed bearing assembly; in fig. 2 - the same, with double the amount of lubricant briquettes.

The bearing assembly includes a sleeve 1, covering the journal 2 of the shaft. In the sleeve 1, the channel 3 is made to supply oil to the working area of the bearing assembly. A pin is made with a longitudinal axial groove 4, in which a solid lubricating briquette 5 is placed, pressed against the working surface of the sleeve 1 by means of pressing, made in the form of a spring 6. Solid lubricating briquette 5

with the help of tg 7, which are installed with the possibility of moving in parallel through radial holes, made in the shaft axle and passing through its axis, is connected with a weight 8 made of a material with a large specific weight (copper, lead, tin or their alloys), and is located in the longitudinal axial groove 9 (Fig. T), higher than the nominal in trunnion 2 in a diametrically opposite position relative to the groove 4, in which the solid lubricating briquette 5 is located. The groove 9 is closed by the lid 10.

When making a sliding bearing unit with double the amount of hard briquettes 5 (Fig. 2), the grooves 4 and 9 are used to jointly place solid lubricating briquettes 5 and weights 11 and 12 in them, respectively.

Bearing unit works as follows.

At the initial moment of time, when the machine operates in the unsteady mode of operation, pin 2 is in direct contact with the working surface of sleeve 1. A solid-lubricating briquette 5 placed in the longitudinal groove 4 is pressed against the rough working surface of sleeve 1 by means of a spring 6. When the shaft rotates, causes friction of the briquette 5 against the surface of the bushing, as a result of which wear products are formed - powdered solid lubricant providing separation of the rubbing surfaces.

As the machine goes into steady state operation, the shaft speed increases and the oil pressure in the lubrication system increases. The oil enters the contact space through channel 3. These two factors contribute to the effect of hydrodynamic lubrication: an oil wedge is formed that separates the rubbing elements, for example sleeve 1 and pin 2.

At the same time, increasing the shaft rotational frequency increases the centrifugal force acting on the load 8, placed in the groove 9. Since the load 8 is connected to the solid-lubricating briquette 5 by means of t g 7, this causes the briquette to move in the direction of the shaft axis and move it away from the surface friction bushings.

The greater the rotational speed, the lower the force of the compact 5 pressed against the surface of the sleeve 1, and the less it wears out. Thus, in the sliding bearing assembly, a combined lubrication mode is implemented: solid lubrication in transient operating modes when the shaft rotation frequency is lower than the nominal one, and hydrodynamic lubricant when entering the stationary operating mode. The cover 10 closes the longitudinal groove 9.

It is possible to perform a sliding bearing unit with double

solid lubricating liners (Fig. 2). In this case, the longitudinal grooves 4 and 9 serve to simultaneously place the solid lubricating briquette and the load in them.

The site provides the implementation of a rational, combined lubrication mode in accordance with the mode of operation of the machine. This greatly increases durability by ensuring reliability.

and reliability of the bearing assembly.

Claims (2)

1. A bearing assembly comprising a female shaft journal, a sleeve with a channel for supplying the working medium, a solid-lubricating briquette placed in the groove, and means for pressing it to the friction surface, made in the form of a spring, characterized in that, in order to increase reliability, it is equipped with rods installed with the possibility of longitudinal movement in parallel through radial holes made in the axle shaft and passing through its axis, and with a load fixed at one end of the g, and solid lubricant the briquette is installed at the other end of the tg, with the load and solid lubricating briquette installed in longitudinal with respect to the axis of the axle grooves made from diametrically opposite sides, while solid lubricating briquette is pressed against the surface of the friction sleeve. 2. The assembly of claim 1, excluding that, in order to increase durability, it contains a pair of solid lubricating briquettes, weights and rods, and in each diametrically located groove the trunnions are installed one by one for the lubrication briquette and the cargo, and each of them is mounted on the side of the lubrication briquette in the hole made for it in the cargo with the possibility of axial movement. FIG. I