DE102017114618A1 - Rolling bearing cage with emergency running property - Google Patents

Abstract

The invention relates to a roller bearing cage (1) for a rolling bearing with at least one cage ring (2), wherein the cage ring (2) comprises a core element (3) which forms the basic shape of the roller bearing cage (1), wherein the core element (3) of a Shell element (5) is surrounded, which forms the outer shape of the rolling bearing cage (1), and wherein between the core element (3) and the shell element (5), an intermediate element (4) is arranged. Furthermore, the invention relates to a method for producing a roller bearing cage (1).

Description

The invention relates to a roller bearing cage for a rolling bearing having at least one cage ring, wherein the cage ring comprises a core element which forms the basic shape of the rolling bearing cage, wherein the core element is surrounded by a shell element which forms the outer shape of the rolling bearing cage. Furthermore, the invention relates to a method for producing a roller bearing cage.

Conventional rolling bearings usually fail due to cage breakage and must be replaced.

To counteract this failure, rolling bearing cages are usually oversized mechanically and / or expensive cage materials are used.

Also, rolling bearings or roller bearing cages from the prior art have no emergency running properties.

It is therefore an object of the present invention to provide a roller bearing cage, which is preferably produced to save material and ensures improved mechanical properties and emergency operation.

It is another object of the present invention to provide a method for producing a roller bearing cage, which preferably works to save material and ensures the realization of a roller bearing cage with improved mechanical properties and conveniently an emergency.

These objects are achieved by the features of the independent claims. Further advantageous developments are the subject of the dependent claims.

According to the invention, in a first aspect of the present invention, a roller bearing cage for a roller bearing comprises at least one cage ring.

Furthermore, it is favorable if the cage ring comprises a core element which forms the basic shape of the roller bearing cage.

Preferably, the core element is surrounded by a shell element that forms the outer shape of the rolling bearing cage. Here, the shell element is preferably designed such that its outer dimensions correspond to those of a conventional rolling bearing cage.

Preferably, an intermediate element is arranged between the core element and the shell element.

Advantageously, the intermediate element encloses the core element at least partially, particularly preferably completely.

It can also be provided that the intermediate element comprises cavities for forming a damping and decoupling of forces which act on the core element from the shell element.

Furthermore, it is advantageous if the intermediate element comprises a grid structure and / or a honeycomb structure.

In summary, it can be stated that preferably the intermediate element forces that act on the roller bearing cage, decoupled from the core element and these are largely damped to free the core element of mechanical stresses. In this way, therefore, a roller bearing cage can be created with an emergency, wherein the emergency is realized in the event of a cage break of the core element, which continues to lead the rolling elements.

It is also advantageous if the shell element surrounds the intermediate element in order to realize a usable standard geometry of the roller bearing cage.

Furthermore, it is preferred that the core element, the intermediate element and / or the shell element have the same material or different materials. The materials may be, for example, plastics or metals or a combination thereof or even fiber composites.

Furthermore, it is advantageous if at least two webs extend from the cage ring for guiding and holding a rolling element.

Advantageously, a Wälzkörpertasche is formed in the circumferential direction between the webs, which can preferably accommodate a rolling element.

A second aspect of the present invention includes a method of manufacturing a rolling bearing cage.

It is expressly understood that the features of the rolling bearing cage, as mentioned in the first aspect, can be used individually or in combination with each other in the method for producing a roller bearing cage application.

In other words, the features mentioned above under the first aspect of the invention concerning the roller bearing cage can also be combined here with further features under the second aspect of the invention.

Advantageously, the inventive method for producing a roller bearing cage preferably comprises the following steps.

Advantageously, a step comprises producing an intermediate element on a core element of a roller bearing cage using a generative manufacturing method.

• - selektives Laserschmelzen,
• - selektives Lasersintern,
• - Selective Heat Sintering,
• - Binder Jetting,
• - Elektronenstrahlschmelzen,
• - Fused Deposition Modeling,
• - Wax Deposition Modeling,
• - Contour Crafting,
• - Metall-Pulver-Auftragsverfahren,
• - 3D-Siebdruck von Metallen, und/oder
• - Stereolithografie.

In the present description, an additive manufacturing process is preferably to be understood as one of the following methods, this list only being to be understood as an example:

• selective laser melting,
• selective laser sintering,
• - Selective Heat Sintering,
• - binder jetting,
• - electron beam melting,
• - fused deposition modeling,
• - Wax Deposition Modeling,
• - Contour Crafting,
• Metal powder coating method,
• - 3D screen printing of metals, and / or
• - stereolithography.

Another preferred step of the method comprises coating the intermediate element to produce a shell element, which preferably corresponds to the outer dimensions of the rolling bearing cage to be created.

• - Thermisches Spritzen
• - Pulverbeschichten
• - Wirbelsintern
• - Rotationsbeschichtung
• - Plastifizieren
• - Schmelztauchen
• - Emaillieren
• - Rakelbeschichtung
• - Tauchbeschichtung
• - Walzenbeschichtung
• - Mehrfachbeschichtung durch Kaskaden- oder Vorhanggießen

For example, in the coating step, the following methods can be used:

• - Thermal spraying
• - Powder coating
• - Whirling
• - spin coating
• - plasticizing
• - melting dipping
• - Enameling
• - Squeegee coating
• - dip coating
• - Roller coating
• - Multiple coating by cascade or curtain coating

Advantageously, a step of the method comprises generating a core element of a rolling bearing using a generative manufacturing method.

Another preferred step involves creating a shell element of a rolling bearing using a generative manufacturing process.

Finally, it should be mentioned, a cage is understood in the present description under a rolling bearing cage, which can be configured as a flap cage, as riveted cage, snap cage, as a window cage, as a two-piece riveted solid cage, as a two-piece comb cover cage, as a one-piece window cage or as a double comb cage.

Hereinafter, the inventive idea presented above is expressed in other words in addition.

This idea preferably relates - in simplified form - to a generatively produced roller bearing cage, with the functional integration of an emergency running feature.

Such a roller bearing cage is designed for example for applications with high security requirements, such. B. in an aircraft engine storage.

By means of the roller bearing cage according to the invention, a cost-intensive shutdown due to a cage fracture can be avoided. Because despite the cage breakage, the function of the rolling element guide can be maintained, as a result of which the definitive rolling bearing failure can be delayed (for example, until the landing of an aircraft).

Of course, the rolling bearing cage according to the invention can also be used in large bearings, high-end bearings (eg wind turbine bearings), etc.

The invention is preferably based on the task of integrating a functional extension in a standard cage geometry or in a standard rolling bearing cage.

This should preferably be achieved with the aid of the geometrical freedom of additive production (such as, for example, bed processes, material deposition processes, eg laser beam melting, stereolithography, binder jetting), so that a rolling bearing cage emergency running property which was previously unattainable can be implemented.

The present invention is concerned with a roller bearing cage and preferably a method for producing a roller bearing cage.

Conveniently, a rolling bearing cage with emergency running on a shell / core construction, the outer thick-walled shell element preferably corresponds to a classic cage geometry (rolling element leadership on known outer functional surfaces) and the interior of which conveniently includes a complex geometry.

This integrated internal cage geometry is preferably via an additively produced structure, such. B. a damping grid structure, or connected via a generatively produced intermediate element to the outer cage geometry or the shell element.

Preferably, the intermediate element decouples or isolates the core element, so that a force action of the rolling elements on the roller bearing cage acts almost exclusively on the outer cage geometry or the shell element during the bearing operation, whereby the internal cage geometry or the core element is advantageously spared and thus no material aging is experienced.

The shell element, the core element and the intermediate element may be constructed of the same material or different materials.

In the case of a cage break favorably holds the fresh unloaded core element together the fragments, whereby the actual function of the rolling bearing guide is maintained.

In addition, the elastic and plastic deformation of the intermediate element absorbs the jerking forces of the fracture. The emergency running property of the rolling bearing cage is consequently realized with the aid of the rolling bearing body according to the invention.

• 1 eine dreidimensionale Ansicht auf einen erfindungsgemäßen Wälzlagerkäfig.

The invention will be explained in more detail with reference to an embodiment in conjunction with an accompanying drawing. This shows schematically:

• 1 a three-dimensional view of a rolling bearing cage according to the invention.

1 shows a three-dimensional view of a rolling bearing cage according to the invention 1 ,

Shown in more detail, shows 1 a rolling bearing cage 1 for a rolling bearing with an upper cage ring 2a and a lower cage ring 2 B ,

From the upper cage ring 2a various webs extend to guide and support a rolling element, such. B. webs 6 . 7 , to the lower cage ring 2 B ,

In this case, rolling body pockets are formed in the circumferential direction between the webs. So z. B. between the webs 6 . 7 a rolling body pocket 8th educated.

Furthermore, the cage ring has 2 a core element 3 , which is the basic form of rolling bearing cage 1 forms.

The core element 3 is from a shell element 5 surrounded, which is the outer shape of the rolling bearing cage 1 forms.

Between the core element 3 and the shell element 5 is an intermediate element 4 arranged.

The intermediate element 4 envelops the core element 3 completely, with the intermediate element 4 Voids (not shown) for forming a damping and decoupling of forces, from the shell element 5 on the core element 3 act. Shown more concretely, includes the intermediate element 4 a honeycomb structure.

As 1 further shows, envelops the shell element 5 the intermediate element 4 to a usable standard geometry of the rolling bearing cage 1 to realize.

Here are the core element 3 , the intermediate element 4 and the shell element 5 the same material.

In the case of a cage break so after, for example, the destruction of the shell element 5 and the deformation or even the destruction of the intermediate element 4 the core element 3 that the geometry of the rolling bearing cage 1 simulates a run-flat be realized. This emergency also ensures the function of the machine in which a bearing is used with a roller bearing cage according to the invention, at least for a certain period.

Below is a method of manufacturing the rolling bearing cage 1 to 1 briefly described. This procedure includes the following steps.

So in a first step, the core element 3 of the rolling bearing 1 generated using a generative manufacturing process.

Then an intermediate element 4 on the core element 3 a rolling bearing cage 1 generated using a generative manufacturing process.

Following this, the intermediate element becomes 4 for producing the shell element 5 coated so that the formed rolling bearing cage 1 the outer dimensions of the rolling bearing cage to be created 1 equivalent.

Alternatively, it is also possible, the shell element 5 also using an additive manufacturing process.

LIST OF REFERENCE NUMBERS

1

Rolling bearing cage

2

cage ring

3

core element

4

intermediate element

5

shell element

6

web

7

web

8th

rolling body

Claims (4)

Rolling bearing cage (1) for a rolling bearing with at least one cage ring (2), - wherein the cage ring (2) comprises a core element (3), which forms the basic shape of the roller bearing cage (1), - Wherein the core element (3) by a shell element (5) is surrounded, which forms the outer shape of the rolling bearing cage (1), and - Wherein an intermediate element (4) is arranged between the core element (3) and the shell element (5). Rolling bearing cage after Claim 1 in which the intermediate element (4) at least partially surrounds the core element (4), wherein preferably the intermediate element (4) comprises cavities for forming a damping and decoupling of forces preferably from the shell element (5) to the core element (3). acting, - wherein preferably the intermediate element (4) comprises a grid structure and / or a honeycomb structure. Rolling bearing cage after Claim 1 or 2 - wherein the shell element (5) encloses the intermediate element (4) in order to realize a usable standard geometry of the roller bearing cage (1), wherein preferably the core element (3), the intermediate element (4) and / or the shell element (5) have the same material or different materials. Method for producing a roller bearing cage (1), in particular according to one of the Claims 1 to 3 comprising the following steps: - producing an intermediate element (4) on a core element (3) of a roller bearing cage (1) by means of a generative manufacturing process.

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