JPS5828096A - Sliding bearing - Google Patents

Abstract

PURPOSE:To prevent magnetic foreign materials from intruding onto lubricating surfaces by installing a magnet inside a bracket, to which bearing metals are fixed, so that the magnet absorbs magnetic foreign materials mingled into lubricating oil. CONSTITUTION:Permanent magnets 13, 14 and 15 are provided in close contact with the internal surface of a lower bracket 2, and they absorb iron powder mingled into lubricating oil 8. Accordingly, the movement of iron powder is prevented in spite of stir of the lubricating oil 8 caused by revolution of an oil ring 9. It prevents iron powder from intruding into the gap between a rotary shaft 7 and an upper metal 5 or a lower metal 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sliding bearing, and more particularly, to an improvement of a special self-lubricating sliding bearing.

FIG. 1 is a sectional view showing an example of the structure of a conventional self-lubricating oil ring type sliding bearing, and FIG. 2 is a vertical sectional view corresponding to the cross section taken along the line 1--n. In the figure, (1) is this conventional sliding bearing, (2) is the lower bracket, (3) is the upper bracket placed on this lower bracket (2),
(4) is the upper bracket (3) the lower bracket? (2)
(5) is the lower metal fixed to the lower bracket (2) by means not shown, (6) is the lower metal (
5) is a rotating shaft supported by a lower metal (5) and an upper metal (6), and (8) is surrounded by a lower bracket (2) and an upper bracket (3). The lubricating oil (9) is formed into a ring shape that penetrates the lower metal (5) and the upper metal (6) near the boundary and surrounds the rotating shaft (7). The oil ring αQ is immersed in lubricating oil (8) and rotatably arranged so that the inner side of the upper end contacts the rotating shaft (7) with its own weight, and αQ is drilled in the lower bracket (2). ), (11) is an oil drain hole provided at the bottom of the lower bracket (2) and drains the lubricating oil (8), (12) is an oil fill hole (10) and an oil drain hole (11). This is a seal bolt that prevents lubricating oil (8) from leaking from ).

In this conventional device, when the rotating shaft (7) rotates in the direction of the arrow shown in the figure (counterclockwise), the oil ring (
9) also rotates in the same direction. At this time, the oil ring (
The lower part of the lubricating oil (8) is immersed in the lubricating oil (8).
) has a high viscosity, as the oil ring (9) rotates, the lubricating oil (8) adheres to the area around the oil ring (9) and rises to the upper end of the oil ring (9). A part of this lubricating oil (3) falls onto the upper surface of the rotating shaft (7), and furthermore, as the rotating shaft (7) rotates, a part of this lubricating oil (3) falls onto the upper surface of the rotating shaft (7).
) and the lower metal (5) and upper metal (6).
7) and both the upper and lower metals (5) and (6), a good lubrication state is maintained.

In many cases, this good lubrication state is maintained for a long period of time, and the sliding bearing (1) does not play its role. And, although it is rare, sliding bearings (1)
During the process of disassembly and assembly of the lubricating oil (8) or when replacing the lubricating oil (8), iron powder such as chips (not shown) may get mixed into the lubricating oil (8). 8) If K sinks to the bottom and moves, there is no problem. However, since the lubricating oil (8) is stirred by the rotation of the oil ring (9), the mixed iron powder will float in the lubricating oil (8), and as the oil ring (9) rotates, the iron powder will be dispersed. Iron powder may be carried to the upper surface of the rotating shaft (7) and sometimes enter the gaps between the rotating shaft (7) and both the upper and lower metal parts (5) and (6). When such a force situation occurs, the rotating shaft (7) and both the upper and lower metal parts (5) and (6) are slightly damaged. When this damage becomes deformed, the lubrication on the lubricating surface of the sliding bearing (1) deteriorates, and the sliding bearing (1) eventually loses its function as a bearing, and the rotating shaft (7) becomes unable to rotate. .

This invention was made in view of the above points, and even if iron powder were to get mixed into the lubricating oil, it would prevent it from entering the lubricated surface and ensure stable bearing function over a long period of time. The purpose is to provide a sliding bearing that can be held.

FIG. 3 is a sectional view showing the structure of the first embodiment of the present invention. Hereinafter, parts equivalent to those of the conventional example shown in FIG. 1 are designated by the same reference numerals to avoid duplication of explanation. In the figure, (1a) is the sliding bearing of this first embodiment, (13), (141
and (15) are permanent magnets closely fixed to the inner surface of the lower bracket (2). Such a permanent magnet (+:
4. (+41, θ is provided in the lubricating oil (8), so that all the iron powder mixed in the lubricating oil (8) can be adsorbed to it.0 Therefore, the oil ring (
Even if the lubricating oil (8) is agitated by the rotation of 9), the movement of iron powder is suppressed, and iron powder is prevented from entering between the upper and lower metals (5), (6) and the rotating shaft (7). lubrication is maintained well, and the bearing function of this embodiment is maintained stably for a long period of time. In addition, permanent magnet θ3) ,, (14
), (+5) may be fixed to the lower bracket (2) without using means such as screws, and may be fixed using magnetic attraction force to the iron forming the lower bracket (2).

In the first embodiment, the permanent magnet was fixed to the inner surface of the lower bracket (2) so as to be immersed in the lubricating oil (8). These brackets (2) adhere to the outer surface of the
) and (3) are magnetized to attract iron powder mixed in the lubricating oil (8) to the inner surfaces of the platan) (2) and (3) to prevent damage to the flat bearing (1a). You can also do that.

In addition, although permanent magnets were used in the first embodiment, the fourth embodiment
The second embodiment of the sliding bearing (1b
), an electromagnet consisting of a core (+6) and a coil θη may be used to adsorb the mixed iron powder.

Furthermore, as in the third embodiment of the cross-sectional bearing (LC) shown in the cross-sectional view in FIG.
0) Wrap it around the outer circumference of one body, magnetize the lower bracket (2) and upper bracket (3) as core substitutes, and make the iron powder in the lubricating oil (8) stick to the inner surface of the lower bracket (2). You can also do it like this.

In this third embodiment, the coil (+8) is made larger to increase the attraction force as an electromagnet, thereby making it possible to more reliably attract the iron powder to the inner surface of the lower bracket (2).

And the second. In the third embodiment, if the energization to the coils o7) and H is stopped, the attractive force of the electromagnet disappears, so
This is convenient for discharging iron powder that has been adsorbed up to that point through the oil discharge hole (n).

As detailed above, in the self-lubricating sliding bearing according to the present invention, since a magnet is provided to attract magnetic foreign matter mixed in the bracket NC lubricating oil, Y7 prevents these foreign matter from entering the lubrication A. This allows the bearing to perform stably over a long period of time.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an example of the structure of a conventional plain bearing;
The figure is a vertical sectional view corresponding to the cross section taken along the line ■-■, and FIGS. Second
and FIG. 7 is a sectional view showing the configuration of a third embodiment. In the figure, (2) is the lower bracket, (3) is the upper bracket), (5) is the lower metal, (6) is the upper metal, (7) is the rotating shaft, (8) is the lubricating oil, and (9) is the Oil ring (self-lubricating means), +13), (+4), (15) are permanent magnets, (country is the core of the electromagnet, 07) is the electromagnetic coil, and the river is the coil. In addition, the same reference numerals in the figures indicate the same or corresponding parts.
Makoto Kuzuno - (1 other person) Figure 1, Figure 2, Figure 4, Figure 5, 51/

Claims (4)

[Claims] (1) A metal that supports the rotating shaft, a bracket to which this metal is fixed, lubricating oil contained in this bracket,
and automatic lubrication means provided in the bracket for supplying the lubricating oil to the entire interface between the rotating shaft and the metal in accordance with the rotation of the rotating shaft, wherein the lubricating oil is supplied to the bracket. A plain 9 bearing characterized by being equipped with a magnet that attracts mixed magnetic foreign matter. (2) A sliding bearing according to claim 1, characterized in that a permanent magnet is provided as a magnet by being immersed in lubricating oil within the bracket. (3) A plain bearing according to claim 1, characterized in that an electromagnet is mounted on the outer surface of a bracket made of a magnetic material as a magnet. (4) A plain bearing according to claim 1, characterized in that a coil is wound around the outer periphery of a bracket made of a magnetic material, and the bracket itself becomes a magnet by energizing the coil.