DE102015101464A1 - Rolling bearing cage, rolling bearing and method for producing a rolling bearing cage - Google Patents

Abstract

The present invention proposes a roller bearing cage for a rolling bearing, wherein the rolling bearing cage comprises a base body, wherein the base body is at least partially covered with a first sliding member and wherein the first sliding member is at least partially covered with a second sliding member.

Description

 State of the art

The present invention relates to a rolling bearing cage, a rolling bearing and a method of manufacturing a rolling bearing cage.

Rolling bearings with rolling bearing cages are well known from the prior art. In this case, the rolling bearing cages are arranged for example between an inner ring and an outer ring and are equipped with rolling elements, which are usually arranged movably in the rolling element cage and thereby reduce the friction between the inner ring and the outer ring.

In order to reduce the friction between Wälzkörperkäfig and the inner ring or the outer ring or to avoid a contact steel on steel, the rolling bearing cages are coated from the prior art with a plastic layer. However, in the case of heavily soiled bearings, the coating may be damaged so that there is a risk of plastic separation. As a result of the potential plastic separation would be expected to undesirable wear of the steel surface. Alternatively, rolling bearing cages are costly made of bronze.

Disclosure of the invention

It is an object of the present invention to provide a roller bearing cage which, installed in a rolling bearing, withstands as long as possible the stresses caused by contact with bearing components of the rolling bearing.

The present invention solves the problem by a rolling bearing cage for a rolling bearing, wherein the rolling bearing cage comprises a base body, wherein the base body is at least partially covered with a first sliding element and wherein the first sliding element at least partially covered with a second sliding element, preferably in the form of a sliding layer is.

Compared to the state of the art in the rolling bearing cage according to the invention waived that the entire body of the rolling bearing cage is made of a material with which the friction between the built-in rolling bearing bearing and a bearing part of the bearing can be reduced. Instead, the first sliding element and the second sliding element provide the desired reduction of the friction, as a result of which the choice of material for the basic body is essentially unlimited. In particular, it can be avoided to manufacture the rolling bearing cage holistically made of bronze. Moreover, the first sliding element ensures a desired sliding behavior even when the second sliding element comes loose or tears.

Preferably, it is a roller bearing cage for a rolling bearing having a first bearing part and a second bearing part, wherein the first bearing part is arranged to be movable relative to the second bearing part. In particular, the rolling bearing cage is arranged in the installed state between the first bearing part and the second bearing part. In particular, it concerns a rolling bearing cage for an angular contact ball bearing, a cylindrical ball bearing or a tapered roller bearing. But there are also other known from the prior art rolling bearing types conceivable. The skilled person will appreciate that the rolling bearing cage consists of one or more rolling bearing cage segments. In particular, it is also conceivable that the rolling bearing cage as a partial ring, d. H. as a segment of a ring, is configured.

Advantageous embodiments and modifications of the invention are the dependent claims and the description with reference to the drawings.

According to a further embodiment of the present invention, it is provided that the first sliding element is a bronze-containing first sliding element and / or the second sliding element is a plastic-containing second sliding element. By using bronze-bearing first sliding elements, the friction-reducing properties of bronze can be integrated into the rolling bearing cage without the entire main body of the roller bearing cage having to be made of bronze. A plastic-containing second sliding element also advantageously reduces the friction. By arranging the plastic-containing second sliding element over the bronze-containing first sliding element, it is possible to ensure that when the second sliding element tears or loosens, the bronze-containing first sliding element obtains the desired sliding ability of the rolling bearing cage.

According to a further embodiment of the present invention, it is provided that the first sliding element is completely covered by the second sliding element. This advantageously ensures that the first sliding element is protected by the second sliding element until the second sliding element comes loose or tears. In particular, it is provided that the second sliding element extends beyond an edge region of the first sliding element.

According to a further embodiment of the present invention, it is provided that the rolling bearing cage in a built-up in a rolling bearing state between a first bearing part and a second bearing part of the rolling bearing is arranged, wherein the first sliding element is arranged on a side facing the first bearing part and / or the second bearing part. By selectively attaching the first sliding element in areas in which the rolling bearing cage can come into contact with the first bearing part or the second bearing part, the covering with the first sliding element and the second sliding element can be limited to the areas that occur when using the rolling bearing be charged. Consequently, the cost of materials for the sliding layer can be reduced in an advantageous manner.

According to a further embodiment of the present invention, it is provided that a bronze slider is welded to the roller bearing cage as bronze-containing first sliding element. It is also conceivable that the slider is welded from bronze. In particular, it is provided that a sheet of bronze is welded to a side facing the first or second bearing part side of the rolling bearing cage. By means of a cohesive connection thus produced, a durable attachment of the first sliding element to the roller bearing cage is ensured without much effort.

According to another embodiment of the present invention, it is provided that the base body is annular. In particular, the first bearing part is an inner ring and the second bearing part is an outer ring. Furthermore, it is conceivable that in the case of an angular contact ball bearing or a tapered roller bearing, the annular base body spans a main extension plane, wherein the main body itself extends substantially obliquely to the main extension plane.

According to a further embodiment of the present invention, it is provided that in the installed state, a rolling element is arranged in the roller bearing cage. For example, it is a cylindrical, conical or spherical rolling element, which is arranged in a Wälzkörperaufnahme the Wälzkörperkäfigs. In this case, the Wälzkörperaufnahme is designed such that the matching rolling elements is mounted rotatably about at least one axis in the Wälzkörperaufnahme.

According to a further embodiment of the present invention, it is provided that the plastic-containing second sliding element, preferably in the form of a plastic-containing second sliding element, comprises a polyamide. It is conceivable that the entire rolling bearing cage is covered with the plastic-containing second sliding element in order to avoid edges or edges over which the second sliding element begins to loosen.

According to a further embodiment of the present invention, it is provided that a plurality of first sliding elements along the rolling bearing cage, in particular along the circumference of the rolling bearing cage, are arranged. Preferably, the plurality of first sliding elements along one side of the rolling bearing cage, in particular at regular intervals, arranged. It is conceivable that the plurality of first sliding elements are each covered by a second sliding element or a common second sliding element.

According to a further embodiment of the present invention, it is provided that the base body is made of a steel. Compared to a roller bearing cage made of bronze can thus be used in an advantageous manner to a cheaper material.

According to a further embodiment of the present invention, it is provided that the main body has a Wälzkörperaufnahme for receiving rolling elements, wherein the first sliding element is arranged outside of the Wälzkörperaufnahme.

Another object of the present invention is a rolling bearing with a rolling bearing cage according to the invention.

Another object of the present invention is a method for producing a rolling bearing cage, in particular a rolling bearing cage according to the invention, wherein in a first step, a base body is provided, wherein in a second step, a bronze-containing first sliding member is arranged on the base body, preferably welded, and in a third method step, the first sliding element is covered with a plastic-containing second sliding element.

Compared to the prior art, thanks to the first sliding element and the further sliding element, a comparatively durable rolling bearing cage can be made available, in which a choice of material for the basic body can be taken substantially freely. In particular, the rolling bearing cage for a rolling bearing, such as an angular contact ball bearing, a cylindrical roller bearing or a tapered roller bearing is provided.

According to a further embodiment of the present invention, it is provided that in the third method step, the first sliding element is completely covered.

Further details, features and advantages of the invention will become apparent from the drawings and from the following description of preferred embodiments with reference to the drawings. The drawings merely illustrate this exemplary embodiments of the invention, which do not limit the inventive idea.

Brief description of the figures

The 1 shows a roller bearing cage according to an exemplary embodiment of the present invention.

The 2 shows a section of the rolling bearing cage according to the exemplary embodiment of the present invention from a first angle.

The 3 shows a section of the rolling bearing cage according to the exemplary embodiment of the present invention from a second angle.

The 4 shows a section of the rolling bearing cage according to the exemplary embodiment of the present invention from a third angle.

Embodiments of the invention

In the various figures, the same parts are always provided with the same reference numerals and are therefore usually named or mentioned only once in each case.

In 1 is a rolling bearing cage 1 for a rolling bearing according to an exemplary embodiment of the present invention. It is envisaged that the rolling bearing cage 1 is arranged between a first bearing part and a second bearing part (not shown), wherein the first bearing part is movable relative to the second bearing part. In the illustrated embodiment, it is a rolling bearing cage 1 for a tapered roller bearing whose first bearing part comprises an outer ring and the second bearing part comprises an inner ring. It is preferably provided that the rolling bearing cage 1 is configured such that it has a plurality of rolling elements, in particular conical rolling elements, in a corresponding plurality of Wälzkörperaufnahmen 4 in particular, in each case a rolling element in a Wälzkörperaufnahme 4 can be arranged. Preferably, the rolling element is so precisely to the Wälzkörperaufnahme 4 designed that in the Wälzkörperaufnahme 4 arranged rolling elements is rotatably mounted about at least one axis of rotation. Furthermore, it is provided that the rolling bearing cage 1 comprises a substantially annular base body, wherein, preferably at regular intervals, the Wälzkörperaufnahmen 4 are recessed as recesses in the annular base body. In the illustrated embodiment, the annular base body spans a main extension plane, wherein the recesses in the annular base body extend substantially obliquely to the main extension plane. In this case, a resulting angle of inclination with respect to the main extension plane is preferably about 45 °. Furthermore, it is provided that the rolling bearing cage 1 , in particular the annular rolling bearing cage 1 , made of steel. In order to improve the sliding properties of the first bearing part and / or the second bearing part, it is provided that the rolling bearing cage 1 on its surface one or more first sliding elements 2 having. For example, the first sliding elements 2 on the inside 5 of the annular base body, that is, on the inside facing the center of the annular base body 5 arranged, wherein preferably a plurality of first sliding elements 2 are arranged equidistantly or evenly along the circumference. In particular, the first sliding element is 2 a metallic, preferably a bronze, first sliding element 2 , for example, in the form of a sheet to the rolling bearing cage 1 is welded. Here is the first sliding element 2 for example, designed rectangular and covers the inside 5 area. Furthermore, it is preferably provided that the first sliding element 2 is completely covered by a plastic-containing second sliding element 3 , It is conceivable that the second sliding element 3 in the form of a plastic-containing sliding layer of a paint based on a polyamide. It is also conceivable that the paint for corrosion protection zinc is added, with a zinc content of the sliding layer preferably exceeds 50%. Furthermore, it is provided that the plastic-containing second sliding element 3 from the first slider 2 up to the main body of the roller bearing cage 1 extends and preferably covers the body at least partially. Furthermore, it is provided that the area of Wälzkörperaufnahme 4 or the Wälzkörperaufnahmen without first sliding element 2 is designed.

In 2 is a rolling bearing cage 1 according to the exemplary embodiment of the present invention, wherein in the selected representation in the foreground of 2 a section through the rolling bearing cage 1 can be seen and in the background, the perspective view of the adjoining the cut Wälzkörperaufnahmen 4 , It is for the rolling bearing cage 1 provided that he is a first page element 11 and a second side element 12 having, between the first side member 11 and the second side member 12 the Wälzkörperaufnahme 4 is arranged. In particular, the first page element 11 the center of the annular base body facing and the second side member 12 facing away from the center of the annular base body, wherein the first side member 11 and the second side element 12 are arranged offset in height with respect to the main extension plane to each other. Furthermore, it is provided that the first side element 11 a support surface 6 has, which runs substantially parallel to the main extension plane of the annular base body. In particular, it is provided that the inside 5 on which the first sliding element 2 applied, in particular welded, is part of the first side member 11 is and extends substantially perpendicular to the support surface or to the main extension plane. Furthermore, it is provided that in the first side element 11 a transport hole 9 is recessed, with the opening of the transport hole 9 Part of the support surface is.

In 3 is a rolling element absorption 4 a rolling bearing cage 1 according to the exemplary embodiment of the present invention. In the selected plan view of this recess, here the Wälzkörperaufnahme 4 forms, one recognizes a substantially rectangular recess, wherein corner portions of the recess are rounded. In particular, it is provided that the rounded corner areas bulges 8th form. Furthermore, it is provided that the receptacle in the direction of the center of the annular body or in the direction of the first side member 11 rejuvenated.

In 4 is a part of the rolling bearing cage from a wider angle 1 represented according to the present invention. It is provided here that the expansion of the first sliding element 2 along the circumference of the inside of the rolling bearing cage 1 in about the extent of Wälzkörperaufnahme 4 along the circumference of the inside of the rolling bearing cage 1 equivalent.

LIST OF REFERENCE NUMBERS

1

Rolling bearing cage

2

first sliding element

3

second sliding element

4

rolling body

5

inside

7

Center of the annular body

8th

bulges

9

conveying hole

11

first page element

12

second side element

Claims (14)

Rolling bearing cage ( 1 ) for a rolling bearing, wherein the rolling bearing cage ( 1 ) comprises a base body, wherein the base body at least partially with a first sliding element ( 2 ) and wherein the first sliding element ( 2 ) at least partially with a second sliding element ( 3 ) is covered. Rolling bearing cage ( 1 ) according to claim 1, wherein the first sliding element ( 2 ) a bronze-containing first sliding element ( 2 ) and / or the second sliding element ( 3 ) a plastic-containing second sliding element ( 3 ). Rolling bearing cage ( 1 ) according to one of the preceding claims, wherein the first sliding element ( 2 ) of the second sliding element ( 3 ) is completely covered. Rolling bearing cage ( 1 ) according to one of the preceding claims, wherein the rolling bearing cage ( 1 ) is disposed in a state installed in a rolling bearing between a first bearing part and a second bearing part of the rolling bearing, wherein the first sliding element ( 2 ) is arranged on a side facing the first bearing part and / or the second bearing part. Rolling bearing cage ( 1 ) according to one of claims 2 to 4, wherein as bronze-containing first sliding element ( 2 ) a slider made of bronze on the rolling bearing cage ( 1 ) is welded. Rolling bearing cage ( 1 ) according to one of the preceding claims, wherein the base body is annular. Rolling bearing cage ( 1 ) according to one of the preceding claims, wherein in the installed state in the rolling bearing cage ( 1 ) A rolling element is arranged. Rolling bearing cage ( 1 ) according to one of the preceding claims, wherein the plastic-containing second sliding element, preferably in the form of a plastic-containing sliding layer, comprises a polyamide. Rolling bearing cage ( 1 ) according to one of the preceding claims, wherein a plurality of first sliding elements ( 2 ) are arranged along the rolling bearing cage. Rolling bearing cage ( 1 ) according to one of the preceding claims, wherein the base body is made of a steel. Rolling bearing cage ( 1 ) according to one of the preceding claims, wherein the main body has a rolling element receptacle ( 4 ) for receiving rolling elements, wherein the first sliding element ( 2 ) outside of the rolling element receptacle ( 4 ) is arranged. Rolling bearing with a roller bearing cage ( 1 ) according to one of the preceding claims. Method for producing a roller bearing cage ( 1 ), in particular a roller bearing cage ( 1 ) according to one of claims 1 to 11, wherein in a first method step a main body ( 1 ), wherein in a second method step a bronze-containing first sliding element ( 2 ) arranged on the base body, preferably welded, is and in a third process step, the first sliding element ( 2 ) with a plastic-containing second sliding element ( 3 ) is covered. Method according to claim 13, wherein in the third method step the first sliding element ( 2 ) is completely covered.

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