JPH0579844B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a bearing with circulating lubrication means for a rotating shaft.

BACKGROUND OF THE INVENTION The service life of a bearing of a rotating shaft depends on the amount of time that a required minimum amount of lubricating medium is present in the bearing, and thus on the presence of a sufficiently thick lubricating film on the contact surfaces of mutually moving parts. On the other hand, if an excess of lubricating medium is present in the bearing, the kneading action of the lubricating medium will cause the operating temperature of the bearing to become higher than permissible. Furthermore, in order to keep the center of mass of the shaft and the housing in a defined position, the lubricating medium must be distributed within the bearing in a precalculable manner, independent of the acceleration. This is especially important in high speed rotating equipment.

Lubricating behavior is best if the bearing is continuously supplied with and drained of lubricating medium so that a constant amount of lubricating medium is always present in the bearing, taking into account evaporation and fluctuations. Evaporation and fluctuations irreversibly and non-regularly deprive the bearing of the amount of lubricating medium. However, it is also known that the fluctuations increase with an increase in the amount of lubricating medium supplied to the bearing.

In order to avoid this extremely difficult problem of a precisely defined supply of lubricating medium to the bearing, it is advisable to draw excess lubricating medium from the bearing. In particular, in the case of small mechanical bearings, in order to keep the total amount of lubricant required for its service life within a reasonable limit, it is effective to appropriately decelerate the excess lubricant drawn from the bearing and re-supply it to the bearing. be. This is essentially a circulating lubrication method, for example, the West German patent
It is disclosed in the specification of No. 2854298.

In this known bearing, a lubricating medium reservoir is provided in the bearing housing, and a device is also provided in the lubricating medium reservoir for supplying the stored lubricating medium to the bearing and for it to flow back from the bearing. This lubricating medium reservoir consists of a porous material, so that the circulating lubricating medium is continuously filtered as it passes through this lubricating medium reservoir. This ensures that the lubricating medium that reaches the bearings is free of dirt and
Moreover, since a sufficient amount of lubricating medium is always supplied, the bearing has a long service life.

Problems to be Solved by the Invention In the bearing disclosed in the above-mentioned West German Patent No. 285298, the lubricating medium reservoir covers the entire bearing, so that the outer ring of the bearing is an elastic reservoir body. Supported by This causes the problem that the balance of the shaft in the bearing casing is not sufficiently stable. According to the West German patent specification, in order to reduce this problem, the outer ring is placed inside the lubricant reservoir. It is supported in the bearing casing in a point-like manner through balls arranged in the bearing casing. This shaft bearing is structurally complex and does not provide balance over time.

SUMMARY OF THE INVENTION An object of the present invention is to provide a means for circulating lubrication for a rotating shaft that has all the advantages of the circulating lubrication method, has extremely high temporal stability in the balance of the shaft with respect to the bearing casing, and has a simple structure. The objective is to provide a bearing with

Means for Solving the Problems The gist of the present invention that solves the above problems is a bearing equipped with circulating lubrication means for a rotating shaft,
It consists of a ball bearing or a rolling bearing, the inner ring of which is fixed to the shaft, the outer ring of which is supported on the inner peripheral surface of a cylindrical bearing casing that surrounds the shaft, and the bearing casing has porous holes. of a lubricating medium reservoir consisting of a lubricating medium material and a device for supplying the stored lubricating medium to the bearing and for allowing the lubricating medium to flow back from the bearing to the lubricating medium reservoir, in which the outer ring of the bearing is , which has an inner surface serving to drain the lubricating medium from the bearing area, which inner surface is directly connected to a receiving reservoir made of a porous material, and which receiving reservoir is connected via a capillary channel. The capillary channel is connected to a lubricating medium reservoir and extends along the inner circumferential surface of the bearing casing, which directly supports the outer ring.

Effect of the Invention According to the invention, the outer ring of the bearing is provided with an inner surface serving to drain the lubricating medium from the bearing area, which inner surface is directly connected to a receiving reservoir made of porous material, the receiving reservoir being by being connected to a lubricating medium reservoir via a capillary passage;
Since a circulating lubrication system is formed and the capillary passage extends along the inner circumferential surface of the bearing casing, the circulating lubrication system is not interrupted even if the outer ring is directly supported on the inner circumferential surface of the bearing casing.

Advantageous configurations of the extent, structure and arrangement of the capillary channels present between the receiving reservoir and the lubricating medium reservoir are described in the claims 2 to 6. Claims 7 to 9 relate to an effective configuration of the receiving reservoir, and claim 10 relates to the configuration of the inner surface of the outer ring of the bearing.

Embodiment The bearing shown in FIG. 1 is designed as a ball bearing. An inner ring 6 of this bearing is fixed to a rotating shaft 5. This inner ring is provided with a groove-shaped rolling surface 8 for the balls 9. The outer ring 10 of the bearing is provided with rolling surfaces 12 for the balls 9. This rolling surface 12
It connects directly, in other words without steps, to the inner surface 11 of the outer ring 10.

A bearing consisting of an inner ring 6, balls 9 and outer ring 10 is surrounded by a cylindrical bearing casing 16,
The outer circumferential surface 17 of the outer ring 10 is directly supported on the inner circumferential surface of this.

A lubricating medium reservoir 1 is provided in the bearing housing 16 and consists of a reel body 2 around which a non-woven strip 3 is wound.

Instead of the non-woven web 3, other porous materials, such as sintered plastic, sintered metal or sintered glass, can also be accommodated in the lubricant reservoir 1.

Liquid lubricating medium is supplied from the lubricating medium reservoir 1 to the rotating shaft 5 via the tongue 4 which is a component of the strip 3 . The relative movement between the shaft 5 and the tongue 4 forms a hydrodynamic lubricating film which constantly draws lubricating medium from the lubricating medium reservoir 1 .

The reel body 2 of the lubricating medium reservoir 1 and the rotating shaft 5 form a pump that moves when the shaft 5 rotates;
This may be configured to supply lubricating medium from the lubricating medium reservoir 1 to the shaft 5. A dynamic pump of this type is disclosed in German Patent No. 2854298.

The bearing shown in FIG. 1 furthermore has a receiving reservoir 13 for lubricating medium, to which the inner surface 11 of the outer ring 10 immediately adjoins. This receiving reservoir 13 is also filled with a porous material, which in the illustrated embodiment consists of a laminated non-woven strip 14.

A capillary channel 15 extends between the receiving reservoir 13 and the lubricating medium reservoir 1 and between the bearing housing 16 and the outer ring 10 . This capillary channel can have, for example, a trapezoidal cross-section, as shown in FIG. This cross section may be triangular, and is often advantageous. In the embodiment shown in FIG. 1, the capillary passage 15 extends approximately parallel to the axis of the shaft 5, but in some cases it may also extend in the form of a helical winding, in other words in the form of a thread in the bearing casing. 16 or may be formed on the outer peripheral surface of the outer ring 10.

Upon rotation of the shaft 5, the tongue 4 is removed from the lubricant reservoir 1.
A lubricating medium, for example oil, is supplied to part 5a of shaft 5 via. This part 5a of the shaft is conically shaped in the area between the tongue 4 and the inner shaft 6. Via this part, oil is conveyed to the inner ring 6 of the bearing. The oil that has reached the inner ring 6 is subjected to the action of centrifugal force, and the oil reaches the end face 7 of the inner ring 6.
along which it reaches the rolling surface 8 of the bearing. The lubricating medium is then distributed by the rotating balls 9 and conveyed to the non-rotating outer ring 10. Excess oil flows out from the rolling surface 12 of the outer ring 10 via the inner surface 11 and reaches the receiving storage 13 directly. The dimensions of the capillary channel 15 are adapted to the capillary structure of the band 14 of the receiving reservoir 13. The capillary channel 15 sucks oil from the receiving reservoir 13 and returns it to the lubricating medium reservoir 1 .
The strip 3 of the lubricating medium reservoir 1 sucks oil from the capillary channels 15, thus forming a circulation path for the lubricating medium.

Various ways of conveying the lubricating medium from the lubricating medium reservoir 1 to the inner ring 6 are possible. One of them is shown in FIG. Another possibility is that the shaft parts 5a, 5
The method is to form a helical winding groove in the groove b. In that case, the lubricating medium is transferred to the inner ring 6 by the helical groove.
transported to.

In the embodiment shown in FIG. 1, two bearings are provided on the rotating shaft 5, but the bearing on the left side in FIG. 1 is shown schematically to simplify the drawing. Part 5 of axis 5
b transports the lubricating medium from the lubricating medium reservoir 1 to the inner ring of this bearing.

Effects of the Invention According to the present invention, since the outer ring of the bearing is directly supported on the inner peripheral surface of the bearing casing, the temporal stability of the balance of the shaft with respect to the bearing casing is significantly increased, and the outer ring is directly supported on the inner peripheral surface of the bearing casing. Since the lubricating medium circulates despite being supported on the inner circumferential surface of the bearing casing, there is always sufficient lubricating medium in all rotating parts. This is extremely important in rotating equipment.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical sectional view of one embodiment of the present invention, and FIG. 2 is a sectional view taken along the line - in FIG. 1... Lubricating medium reservoir, 2... Reel body, 3...
...Nonwoven fabric band material, 4...tongue piece, 5...shaft, 5a,
5b... part, 6... inner ring, 7... end face, 8...
Rolling surface, 9... Ball, 10... Outer ring, 11... Inner surface, 12... Rolling surface, 13... Receiving storage section, 1
4...Nonwoven fabric band material, 15...Capillary passageway, 16...
...Bearing casing, 17...Outer peripheral surface.

Claims (1)

[Scope of Claims] 1. A bearing equipped with circulating lubrication means for a rotating shaft, consisting of a ball bearing or a rolling bearing, the inner ring of which is fixed to the shaft, and the outer ring that lubricates the shaft. A lubricating medium reservoir made of a porous material is supported on the inner circumferential surface of a surrounding cylindrical bearing casing, and a lubricating medium reservoir made of a porous material is provided within the bearing casing. The outer ring 10 of the bearing is
is provided with an inner surface 11 serving to drain the lubricating medium from the bearing area, which inner surface is directly connected to a receiving reservoir 13 made of porous material and which receiving reservoir 13 is made of a capillary material. It is connected to the lubricating medium reservoir 1 via a channel 15, characterized in that the capillary channel 15 extends along the inner circumferential surface of the bearing casing 16, which directly supports the outer ring 10. Bearings with means of circulating lubrication. 2. Bearing according to claim 1, in which the capillary channel 15 extends in a helical manner between the receiving reservoir 13 and the lubricating medium reservoir 1. 3. Bearing according to claim 1, in which the capillary channel 15 extends approximately parallel to the axis of the rotating shaft 5 between the receiving reservoir 13 and the lubricating medium reservoir 1. 4. The bearing according to claim 2 or 3, wherein the capillary passage 15 has a triangular or trapezoidal cross section. 5. Claims 2 to 4, wherein the capillary passage 15 is formed by cutting on the outer circumferential surface 17 of the outer shaft 10.
The bearing described in any one of the preceding paragraphs. 6 Bearing casing 16 with cylindrical capillary passage 15
The bearing according to any one of claims 2 to 4, which is formed by cutting on the inner circumferential surface of the bearing. 7. Bearing according to claim 1, in which the receiving reservoir 13 consists of sintered plastic, metal or glass. 8. The bearing according to claim 1, wherein the receiving storage portion 13 is made of nonwoven fabric. 9. Claims 7 or 8, in which the receiving reservoir 13 and the lubricating medium reservoir 1 are made of the same material.
Bearings listed in section. 10 The inner surface 11 of the outer ring 10 is a rotating rolling element 9
2. The bearing according to claim 1, wherein a step is formed between the support portion and the receiving storage portion 13.