DE102014201104A1 - Lubrication-optimized rolling bearing cage for cylindrical roller bearings - Google Patents

Abstract

The invention relates to a roller bearing cage (1) for cylindrical roller bearings with a plurality of cage pockets (2), wherein the cage pockets (2) are adapted to receive rolling elements and the cage pockets (2) by two parallel outer rings (3, 4) and between the outer rings (2). 3, 4) extending webs (5) are formed, characterized in that a first outer ring (3) first portions (6) having a first ring height (8) and second portions (7) having a second ring height (9), wherein the first ring height (8) is different from the second ring height (9) and wherein a further ring height of a second outer ring (4) is continuous throughout.

Description

Field of the invention

The invention relates to a lubrication-optimized rolling bearing cage for cylindrical roller bearings.

Background of the invention

From the prior art, a plurality of rolling bearing cages is known.

When adopting a floating bearing function are preferably used in motor spindles cylindrical roller bearings. Bearings for particularly fast-turning applications are additionally equipped with high-performance cages and ceramic rolling elements.

Furthermore, the variant of the "half roll number" exists for further reduction of friction during operation of the bearing.

In the DE 11 2011 102 719 T5 For example, there is described a rolling bearing and a machine tool spindle apparatus in which the lubricant discharge performance for suppressing abnormal temperature rise of the rolling bearing is improved, and to allow a reduction in the time required in the case of grease lubrication for a run-in operation. The cage for use in the rolling bearing has a pair of annular portions arranged side by side in the axial direction and a plurality of pillar portions 16 which are arranged in the circumferential direction at given intervals to connect the pair of annular portions. Each of the annular portions has a plurality of convex projected portions on its outer peripheral surface, which are spaced from each other in the circumferential direction. The convex protruding portions of one of the annular portions are formed at circumferentially different positions from the convex protruding portions of the other annular portion.

In spite of the good speed suitability and the floating bearing function, oil overheating or oil-air lubricated cylindrical roller bearings always show over lubricating conditions in certain speed ranges. This condition results from the fact that the line contact of the rolling elements prevents a rapid displacement of the supplied oil. In this state of over-lubrication, the displacement time is greater than the time interval between two successive roles. The oil has to be "overrun". This effect is reinforced by a track-guided cage, as an oil displacement is prevented by the cage guide board.

Summary of the invention

It is therefore the technical task to develop a rolling bearing cage for cylindrical roller bearings, which is easy to manufacture and which allows to avoid over-lubrication conditions in fast-rotating cylindrical roller bearings.

The object is achieved in particular by a roller bearing cage for cylindrical roller bearings with a plurality of cage pockets, wherein the cage pockets are designed to receive rolling elements and the cage pockets are formed by two parallel outer rings and between the outer rings extending webs, characterized in that a first outer ring first regions having a first ring height and second regions having a second ring height, wherein the first ring height is different from the second ring height and wherein a further ring height of a second outer ring is continuously formed constant.

Preferably, the height of an outer ring is to be understood by the ring height.

Preferably, the roller bearing cage is provided for fast rotating cylindrical roller bearings for tool spindle machines. Preferably, the high speed cylindrical roller bearings are high speed cylindrical roller bearings.

Particularly preferably, the second outer ring has a ring height which is less than the ring height of the first outer ring.

Particularly preferably, the second outer ring has a ring height which corresponds to the height of the webs.

By providing different regions along one outer ring, with the other outer ring having a constant height, it is possible to remove lubricants and thus prevent over-lubrication conditions in fast-rotating cylindrical roller bearings.

Particularly preferably, the roller bearing cage is integrally formed. Preferably, the roller bearing cage made of metal, preferably made of steel.

In a further embodiment according to the invention, the first ring height of the first regions of the outer ring is greater than the second ring height of the second regions of the outer ring.

In this case, all first areas have the same ring height. Furthermore, all second areas have the same ring height. However, the first ring height differs from the second ring height.

The first regions are preferably designed as regions which are raised in relation to the second regions.

Preferably, the first and the second regions on the first outer ring can be arranged alternately.

In this way it is possible to create an approximately rotationally symmetrical rolling bearing cage.

Particularly preferably, the first and the second areas are arranged randomly offset, for example, to prevent a harmonic excitation of the rolling bearing cage, which can lead to noise

In a further embodiment according to the invention, the first outer ring has an approximately L-shaped cross section.

In a further embodiment according to the invention, the course of a transition from the first regions to the second regions is continuous.

In this way, a rotation of the rolling bearing cage along the first areas in operation is easily possible.

Preferably, the transition is carried out linearly. Particularly preferably, the transition to a course that is curved, straight and curved designed.

In a further embodiment according to the invention, a length of the first regions is different from a further length of the second regions executable.

In this way it is possible to produce a variety of different geometries, which are applicable depending on the application and the corresponding boundary conditions for the rolling bearing cage.

In a further embodiment of the invention, the areas are convex.

This makes it possible in a simple manner to further improve a leadership of the rolling bearing cage in a device.

Particularly preferably, the areas have an approximately parallelepiped-shaped surface, which is preferably arched outwards.

In a further embodiment of the invention, at least one recess is provided in the first regions, wherein the recess is adapted to allow a lubricant supply of the rolling bearing cage.

Preferably, the recess is a depression, which can be introduced by means of a device in the first region.

In a further embodiment according to the invention, the recess extends over a width of the first regions.

This makes it possible to remove lubricants to avoid over-lubrication of the rolling bearing cage.

Preferably, the recesses are arranged approximately centrally over the length of the first region. Thus, the rotational properties of the rolling bearing cage are least affected.

In a further embodiment of the invention, the recess is concave.

Alternatively, the recess V-shaped, designed line-shaped or semicircular

With the recess, lubricants can be removed very well.

In a further embodiment according to the invention, the first areas are set up to guide the roller bearing cage and the second areas are set up to enable a lubricant supply to the roller bearing cage.

The roller bearing cage preferably consists of plastic, preferably PEEK or polyamide, of brass, of phenolic resin cotton fabric, of steel or of a coated steel material.

Short description of the drawing

The invention will now be exemplified by figures, in which:

1 a schematic side view of a rolling bearing cage according to the invention,

2 a detail of a schematic front view of a rolling bearing cage according to the invention 1 .

3 a schematic view through a section AA 2 .

4 a schematic view through a section BB 2 and

5 a schematic view of an alternative rolling bearing cage according to the invention.

Detailed description of the drawing

1 shows a schematic side view of a rolling bearing cage according to the invention.

The rolling bearing cage 1 has a first outer ring 3 and a second outer ring 4 on, which are parallel to each other. The rolling bearing cage 1 is through the parallel outer rings 3 . 4 and between the outer rings 3 . 4 running bridges 5 (see. 2 ) educated.

The first outer ring 3 has areas 6 . 7 with different ring heights 8th . 9 (see. 3 and 4 ) on. Another ring height of the second outer ring 4 is, in contrast to the ring heights 8th . 9 , consistently formed.

The rolling bearing cage 1 is rotationally symmetrical and is set up in operation around a rotation axis 11 to turn.

The first outer ring 3 has four first areas 6 and four second areas 7 on. A transition from the first area 6 to the second area 7 takes place steadily.

The areas 6 . 7 are convex, ie arched outward, formed.

Here are the first areas 6 furnished, the rolling bearing cage 1 respectively. The second areas 7 and the depressions 10 are set up a lubricant supply of the rolling bearing cage 1 to enable.

With the present invention, a roller bearing cage for cylindrical roller bearings is presented, which is easy to manufacture and which allows to avoid over-lubrication conditions in fast-rotating cylindrical roller bearings.

In 2 is a detail of a schematic front view of a rolling bearing cage according to the invention 1 shown.

The rolling bearing cage 1 has a variety of cage pockets 2 on. The cage bags 2 are designed to take rolling elements, in particular cylindrical roller bearings. The rolling bearing cage 1 is rotationally symmetrical.

The cage bags 2 are through the two parallel outer rings 3 . 4 and between the outer rings 3 . 4 running bridges 4 educated.

3 shows a schematic view through a section AA 2 ,

On average AA is the profile of the rolling bearing cage 1 shown. The profile has an approximately L-shaped cross section through the second outer ring 4 , the footbridge 5 and the first outer ring 3 , which itself has an approximately L-shaped cross-section, is formed.

The first areas 6 of the first outer ring 3 have ring heights 8th on, which are larger than the ring heights 9 the second areas 7 ,

4 shows a schematic view through a section BB 2 ,

In section BB is the profile of the rolling bearing cage 1 shown. The profile has an approximately L-shaped cross section through the second outer ring 4 , the footbridge 5 and the first outer ring 3 , which itself has an approximately L-shaped cross-section, is formed.

The first areas 6 of the first outer ring 3 have ring heights 8th on, which are larger than the ring heights 9 the second areas 7 ,

5 shows a schematic view of an alternative rolling bearing cage according to the invention.

In contrast to the rolling bearing cage 1 from the 1 to 4 has the rolling bearing cage 1 out 5 recess 10 in the first areas 6 on. In the region of the recess, the ring height decreases accordingly

The recess 10 extends over a width of the first area 6 , The recess 10 is approximately centered over a length of the first area 6 intended.

The recess is concave, i. formed curved inward.

With the present invention, an alternative roller bearing cage for cylindrical roller bearings is presented, which is easy to manufacture and which further allows to reduce over-lubrication conditions in fast-rotating cylindrical roller bearings by means of the recesses in addition.

LIST OF REFERENCE NUMBERS

1

 Rolling bearing cage

2

 cage pocket

3

 outer ring

4

 outer ring

5

 web

6

 Area

7

 Area

8th

 ring height

9

 ring height

10

 recess

11

 axis of rotation

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 112011102719 T5 [0005]

Claims (10)

Rolling bearing cage ( 1 ) for cylindrical roller bearings with a large number of cage pockets ( 2 ), with the cage pockets ( 2 ) are adapted to receive rolling elements and the cage pockets ( 2 ) by two parallel outer rings ( 3 . 4 ) and between the outer rings ( 3 . 4 ) running webs ( 5 ) are formed, characterized in that a first outer ring ( 3 ) first areas ( 6 ) with a first ring height ( 8th ) and second areas ( 7 ) with a second ring height ( 9 ), wherein the first ring height ( 8th ) from the second ring height ( 9 ) is different and wherein a further ring height of a second outer ring ( 4 ) is consistently constant. Rolling bearing cage ( 1 ) according to claim 1, wherein the first ring height ( 8th ) of the first areas ( 6 ) of the outer ring ( 3 ) is greater than the second ring height ( 9 ) of the second areas ( 7 ) of the outer ring ( 3 ). Rolling bearing cage ( 1 ) according to one of the preceding claims, wherein the first outer ring ( 3 ) has an approximately L-shaped cross-section. Rolling bearing cage ( 1 ) according to one of the preceding claims, wherein the course of a transition from the first areas ( 6 ) to the second areas ( 7 ) is steady. Rolling bearing cage ( 1 ) according to one of the preceding claims, wherein a length of the first regions ( 6 ) different from a further length of the second regions ( 7 ) is executable. Rolling bearing cage ( 1 ) according to one of the preceding claims, wherein the areas ( 6 . 7 ) are convex. Rolling bearing cage ( 1 ) according to one of the preceding claims, wherein at least one recess ( 10 ) in the first areas ( 6 ) is provided, wherein the recess ( 10 ), a lubricant supply of the roller bearing cage ( 1 ). Rolling bearing cage ( 1 ) according to claim 7, wherein the recess ( 10 ) over a width of the first areas ( 6 ). Rolling bearing cage ( 1 ) according to one of claims 7 to 8, wherein the recess ( 10 ) is concave. Rolling bearing cage ( 1 ) according to one of the preceding claims, wherein the first regions ( 6 ), the rolling bearing cage ( 1 ) and the second areas ( 7 ) are furnished a lubricant supply of the rolling bearing cage ( 1 ).

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