JPS61153015A - Bearing having circulating lubricating means - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 the required minimum amount of lubricating medium is present in the bearing and, therefore, on the presence of a sufficiently thick lubricating film on the contact surfaces of the mutually moving parts. On the other hand, if an excess of lubricating medium is present within the bearing, the kneading effect 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 casing 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 problem, which makes a precisely defined supply of lubricating medium to the bearing extremely difficult to resolve, 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, as disclosed, for example, in German Pat. No. 2,854,298.

In this known bearing, a lubricating medium reservoir is provided in the bearing casing, and a device for supplying the stored lubricating medium to the bearing and constituted by the bearing is further provided in the lubricating medium reservoir. . 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 German Patent No. 2,854,298, the lubricating medium reservoir covers the entire bearing, so that the outer ring of the bearing is an elastic reservoir body. Supported by This results in the problem that the balance of the shaft with respect to the bearing casing is not sufficiently stable, but according to the West German patent specification, in order to reduce this problem, the outer ring is arranged in a lubricating medium reservoir. It is supported in the bearing casing in a dotted manner via balls. 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, which has solved the above problems, is a bearing equipped with circulating lubrication means for a rotating shaft, comprising a ball bearing or a rolling bearing, the inner ring of which is connected to the shaft. The outer ring is supported on the inner circumferential surface of a cylindrical bearing casing surrounding the shaft, and the bearing casing includes a lubricant reservoir made of a porous material and a lubricant reservoir made of a porous material. In those types in which a device is provided for supplying a lubricating medium to the bearing and for returning the lubricating medium from the bearing to a lubricating medium reservoir, the outer ring of the bearing has an opening that serves to drain the lubricating medium from the bearing area. the shoulder being directly connected to a receiving force store made of a porous material, and the receiving force store being connected via a capillary to a lubricating medium reservoir; This capillary tube 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 open shoulder serving to drain the lubricating medium from the bearing area, this shoulder being directly connected to the receiving force store made of porous material. , the force-receiving force store is connected to the lubricant reservoir via a capillary tube, so that a circulating lubrication system is formed, and the capillary tube runs along the inner circumferential surface of the bearing casing, so that the outer ring Even if it is supported directly on the inner peripheral surface of the bearing casing, the circulating lubrication system is not interrupted.

Advantageous configurations of the extent, structure and arrangement of the capillary tube extending between the force-receiving force store and the lubricating medium reservoir are described in the patent claims. Claims 7 to 9 relate to an effective configuration of the receiving force store,
Claim 10 relates to the configuration of the shoulder 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-like transfer surface 8 in the reservoir of the balls 9. The outer ring 10 of the bearing is provided with a transfer surface 12 for the balls 9. This transfer surface 12 continues directly, in other words without steps, to the inner surface 11 of the outer ring 10.

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

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

Instead of the fleece strip 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 fleece strip 3 . The relative movement of the shaft 5 and the tongue 4 forms a hydrodynamic lubricant film which constantly draws lubricant from the lubricant reservoir 1 .

The reel body 2 of the lubricating medium reservoir 1 and the rotating shaft 5 may be configured in such a way that upon rotation of the shaft 5 a dynamic pump is formed which supplies the lubricating medium from the lubricating medium reservoir 1 to the shaft 5. good. This type of dynamic pump was developed in West German patent no. 285
No. 4298.

The bearing shown in FIG. 1 also has a receiving force store 13 for the lubricating medium, into which the outer ring 1 is connected.
0's open shoulders 11 are in direct contact. This receiving force storage 13 is also filled with a porous material, which in the illustrated embodiment is filled with a fleece strip 14 laminated with this material.
It consists of

A capillary tube 15 extends between the receiving reservoir 13 and the lubricating medium reservoir 1 between the bearing housing 16 and the outer ring 10 . This capillary can have, for example, a trapezoidal cross section, as shown in FIG. This cross section may be triangular;
Triangular shapes are often more advantageous. In the embodiment shown in FIG. 1, the capillary tube 15 extends approximately parallel to the axis of the shaft 5, but in some cases it may extend in a helical manner.
In short, it may be formed in a thread shape on the outer peripheral surface of the bearing casing 16 or the outer ring 10.

When the shaft 5 rotates, a lubricating medium, for example oil, is supplied from the lubricating medium reservoir 1 via the tongue 4 to the shaft 50 section 5a. This part 5a of the shaft is conically shaped in the region between the tongue 4 and the inner ring 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 reaches the rolling surface 8 of the bearing along the end face 7 of the inner ring 6. The lubricating medium is then distributed by the rotating balls 9 and conveyed to the non-rotating outer ring 10. Excess oil flows away from the rolling surface 12 of the outer ring 10 via the open shoulder 11 and reaches directly into the receiving reservoir 13 . The dimensions of the capillary tube 15 are adapted to the capillary structure of the fleece strip 14 of the receiving storage 13.

The capillary tube 15 sucks oil from the receiving reservoir 13 and returns it to the lubricating medium reservoir 1 . The fleece strip 3 of the lubricant reservoir 1 absorbs oil from the capillary tubes 15 and closes the lubricant circuit.

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 to form helical grooves in the parts 5a, 5b of the shaft. In that case, the lubricating medium is conveyed to the inner ring 6 by the helical groove.

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 omitted for simplicity. The shaft 50 section 5b 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 circumferential 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 casing, there is always sufficient lubricating medium in all rotating parts.

This is extremely important in rotating equipment.

[Brief explanation of drawings]

FIG. 1 is a partial longitudinal cross-sectional view of one embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1... Lubricating medium reservoir, 2... Reel body, 3...
Fleece strip material, 4... Tongue piece, 5... Shaft, 5a, 5b
... Part, 6... Inner ring, 1... End face, 8... Rolling surface, 9... Ball, 10... Outer ring, 11... Inner surface,
12... Rolling surface, 13... Receiving force storage section, 14...
- Fleece strip material, 15... Capillary tube, 16... Bearing casing, 17... Outer peripheral surface 1... Lubricating medium reservoir 10... Outer ring 16... @ receiving casing

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 of which is fixed to the shaft. The bearing casing is supported on the inner circumferential surface of a cylindrical bearing casing that surrounds the bearing casing. In those types in which a device for returning the medium to the lubricating medium reservoir is provided, the outer ring (10) of the bearing is provided with an open shoulder (11) serving to drain the lubricating medium from the bearing area. and this shoulder is directly connected to a receiving reservoir (13) made of porous material, which receiving reservoir (13) is connected to the lubricating medium reservoir (1) via a capillary tube (15). This capillary (1
5) Extends along the inner peripheral surface of the bearing casing (16) directly supporting the outer ring (10). 2. Bearing according to claim 1, in which the capillary tube (15) extends in a helical manner between the receiving reservoir (13) and the lubricating medium reservoir (1). 6. A capillary tube (15) extends between the receiving reservoir (13) and the lubricating medium reservoir (1) approximately parallel to the axis of the rotating shaft (5). Bearings listed. 4. The bearing according to claim 2 or 3, wherein the capillary tube (15) has a triangular or trapezoidal cross section. 5. The bearing according to any one of claims 2 to 4, wherein the capillary (15) is formed by cutting on the outer peripheral surface (17) of the outer ring (10). 6. The bearing according to any one of claims 2 to 4, wherein the capillary (15) is formed by cutting on the inner peripheral surface of the cylindrical bearing casing (16). 7. Plastic receiving storage part (13) is sintered;
The bearing according to claim 1, which is made of metal or glass. 8. Bearing according to claim 1, in which the receiving force storage (13) consists of fleece. 9. Bearing according to claim 7 or 8, in which the receiving reservoir (13) and the lubricating medium reservoir (1) are made of the same material. 10. The bearing according to claim 1, wherein the inner surface (11) of the outer ring (10) is formed without steps between the support part of the rotating rolling element (9) and the receiving storage part (13). .