DE102017115881A1 - Rolling bearing cage - Google Patents

Abstract

The invention relates to a roller bearing cage (1) comprising a cage ring (2) from which extend retaining arms (3, 4), the rolling body pockets (5), wherein the retaining arms (3, 4) in the circumferential direction between the rolling body pockets (5). are interconnected by axially adjacent to the cage ring (2) intermediate portions (6) which are weakened in the radial direction compared to the cage ring (2) and to the support arms (3, 4).
According to the invention measured in the radial direction of the cage ring (2) thickness (D ₆ ) of each intermediate portion (6) at least 10% and at most 20% of the diameter (D ₅ ) of the rolling body pocket (5).

Description

Field of the invention

The invention relates to a roller bearing cage, namely ball bearing cage, according to the preamble of claim 1.

Background of the invention

Such a ball bearing cage is for example from the DE 10 2009 013 978 A1 known. This known ball-bearing cage has retaining claws designated as projections, through which pockets are formed which serve to receive rolling bodies, that is balls. The projections are connected to each other by web portions, wherein different types of web portions are aligned orthogonal to each other. First web parts, which are aligned in the radial direction of the roller bearing cage, are distributed in sections of an annular disk-shaped space, wherein in the circumferential direction between these web parts is in each case a pocket of the rolling bearing cage. Together with shell-like pocket parts, which form a pocket together with two holding arms each designed as holding claws, the webs of the first type are integral components of a cage ring which lies in a plane normal to the central axis of the rolling bearing cage. Webs of the second type are located in the circumferential direction in each case between two rolling body pockets, wherein they connect both to a web of the first type and to two retaining arms. The thickness of the webs of the second type, measured in the radial direction of the roller bearing cage, is less than the cage cage thickness measured in the same direction, so that free spaces distributed on the circumference of the rolling bearing cage, each delimited by a web of the second type, are formed, which can be used to receive lubricants.

Other, designed as snap cages roller bearing cages for ball bearings are, for example, from the documents DE 199 37 664 A1 . DE 10 2015 214 850 A1 and DE 10 2013 225 998 A1 known.

Rolling bearing cages, in particular snap cages, made of plastic can be produced efficiently by injection molding. By way of example, reference is made to the document in this context DE 10 2009 032 961 A1 pointed.

Object of the invention

The invention has for its object to provide a comparison with the prior art, especially under manufacturing aspects further developed, suitable for high speed characteristics rolling bearing cage.

Description of the invention

This object is achieved by a rolling bearing cage with the features of claim 1. Next, the object is achieved by a rolling bearing, namely ball bearing, according to claim 10.

The rolling bearing cage has, in a known per se basic concept, a cage ring, from which also termed retaining claws extend holding arms, which form rolling body pockets. Between each two circumferentially adjacent Wälzkörpertaschen the various Wälzkörpertaschen associated retaining arms are connected by axially adjacent to the cage ring intermediate sections. The intermediate portions are weakened in the radial direction in comparison to the cage ring and the holding arms, that is relatively thin.

According to the invention, the thickness of each intermediate portion measured in the radial direction of the cage ring corresponds to at least 10% and at most 20% of the diameter of the rolling body pocket, the diameter of the rolling body pocket being approximately equal to the diameter of the ball guided in the rolling body pocket within a completely assembled rolling bearing. In preferred embodiments of the rolling bearing cage, the thickness of the intermediate section measured in the radial direction of the cage ring is at least 1 mm and at most 5 mm.

According to a possible embodiment, the cage ring on the front side, in each case a holding arm opposite, recesses. These recesses are blind-hole-like, not necessarily symmetrical recesses. Outside these recesses, the end face of the cage ring preferably forms an annular surface lying in a single plane. By the front-side recesses in the cage ring, the mass and the moment of inertia of the rolling bearing cage is significantly reduced, without having to accept appreciable impairments in terms of mechanical stability in purchasing. With regard to the geometrical precision of the rolling bearing cage, the recesses in the cage ring are advantageous in comparison to conventional bearing cages in that material accumulations are avoided by the recesses, which could lead to an uneven shrinkage behavior due to unequal cooling rates when manufacturing the cage by injection molding. Together with the intermediate sections, the recesses favor a favorable relationship between mass and mechanical load capacity of the roller bearing cage.

A pair of retaining arms, which together form a Wälzkörpertasche, a pair is associated with recesses, which - is designed mirror-symmetrically - analogous to the support arms. The depth of each recess measured in the axial direction of the cage ring hereby preferably increases from the center of the rolling body pocket towards the edge of the rolling body pocket, that is to say in the direction of the intermediate section adjacent to the rolling bearing pocket. The recesses are preferably contoured in such a way that the wall of the roller body pocket facing the end face of the cage ring has an at least approximately uniform wall thickness.

The minimum wall thickness of the cage ring is given in the middle of each rolling element pocket and measured in the axial direction of the rolling bearing cage. This minimum wall thickness is also known as floor thickness. The thickness of the intermediate section, which is to be measured in contrast to the ground thickness in the radial direction of the roller bearing cage, preferably deviates from the ground thickness by not more than 15%. Starting from the center of a Wälzkörpertasche, that is with increasing in the circumferential direction of the cage ring distance from the point at which the ground strength, the wall thickness of the rolling bearing cage can increase towards the holding arms.

In preferred embodiments of the roller bearing cage, each intermediate section is projected beyond the cage ring both in the radial outward direction and in the radial direction inward, wherein the intermediate section is preferably arranged centrally between the outer circumference and the inner circumference of the cage ring.

The thickness of the cage ring measured in the radial direction of the roller bearing cage preferably corresponds to the thickness of the retaining arms measured in the same direction. Each holding arm is thus tangent over its entire length to an imaginary cylinder concentric to the roller bearing cage, the diameter of which corresponds to the inner diameter of the roller bearing cage. In an analogous manner, each holding arm on the outside of the roller bearing cage tangents an imaginary cylinder placed around the roller bearing cage, whose diameter corresponds to the outside diameter of the roller bearing cage. The thickness of the cage ring preferably corresponds to at least twice the thickness of the intermediate sections.

According to a possible development, the individual intermediate sections of the roller bearing cage extend in the axial direction, on their side facing away from the cage ring, in the form of a pin. This pin, which is also referred to as Auswerferzapfen is advantageous in the injection molding production of the rolling bearing cage. Preferably, the pins are set back relative to a plane applied to the open side of the rolling body pockets in the direction of the cage ring. In other words, the holding arms protrude beyond the pins in the axial direction of the roller bearing cage.

The designed as a snap cage roller bearing cage is preferably intended for use in a deep groove ball bearing. The rolling element diameter corresponds to at least 10 times the thickness and at most 20 times the thickness of an intermediate section of the cage ring. In the intermediate portions of the rolling bearing cage is thus compared to the dimensioning of the rolling elements of the rolling bearing thin-walled structures, which, however, contribute significantly to the stability of the entire rolling bearing cage.

list of figures

• 1 eine räumliche Ansicht der Vorderseite einer ersten Ausführungsform eines als Schnappkäfig ausgebildeten Wälzlagerkäfigs für ein Kugellager,
• 2 einen Querschnitt durch einen Zwischenabschnitt des als Schnappkäfig ausgebildeten Wälzlagerkäfigs gemäß 1,
• 3 eine räumliche Ansicht der Rückseite des als Schnappkäfig ausgebildeten Wälzlagerkäfigs gemäß 1,
• 4 einen Querschnitt durch eine Tasche des als Schnappkäfig ausgebildeten Wälzlagerkäfigs gemäß 1,
• 5 einen Querschnitt durch eine Tasche des Wälzlagerkäfigs gemäß 1 mit einem in dieser geführten Wälzkörper,
• 6 eine räumliche Ansicht der Vorderseite einer zweiten Ausführungsform eines als Schnappkäfig ausgebildeten Wälzlagerkäfigs für ein Kugellager,
• 7 einen Querschnitt durch einen Zwischenabschnitt des als Schnappkäfig ausgebildeten Wälzlagerkäfigs gemäß 6.

The rolling bearing cage according to the invention will be explained in more detail below in two preferred embodiments with reference to the accompanying drawings. Showing:

• 1 3 is a perspective view of the front side of a first embodiment of a roller bearing cage designed as a snap cage for a ball bearing;
• 2 a cross section through an intermediate portion of the formed as a snap cage roller bearing cage according to 1 .
• 3 a spatial view of the back of the trained as a snap cage roller bearing cage according to 1 .
• 4 a cross section through a pocket of the formed as snap cage rolling bearing cage according to 1 .
• 5 a cross section through a pocket of the rolling bearing cage according to 1 with a guided in this rolling elements,
• 6 3 is a perspective view of the front of a second embodiment of a roller bearing cage designed as a snap cage for a ball bearing;
• 7 a cross section through an intermediate portion of the formed as a snap cage roller bearing cage according to 6 ,

Detailed description of the drawings

Unless otherwise indicated, the following explanations refer to both embodiments. Corresponding or basically equivalent parts, structures or dimensions are identified in all figures with the same reference numerals.

A total with the reference numeral 1 characterized rolling bearing cage is designed as a plastic snap cage and intended for use in a deep groove ball bearing. The rolling bearing cage 1 has a cage ring 2 on, which in a ready mounted rolling bearing parallel next to a row in the 1 to 5 as well as in the 6 and 7 not shown rolling elements, that is balls, is located. Only in 5 is a ball 13 visible as a rolling element. Bearing rings of the rolling bearing cage 1 having rolling bearing, namely ball bearings are not shown in any case. The rolling bearing is a radial bearing.

To the cage ring 2 are holding arms 3 . 4 formed, which the individual balls 13 partially embrace and keep at a distance to each other. Here forms a pair of holding arms 3 . 4 a rolling body pocket 5 for picking up a ball 13 is provided. The holding arms 3 . 4 adjacent rolling-body pockets 5 are through intermediate sections 6 connected to each other, which also attached to the cage ring 2 connect and from this in the axial direction of the rolling bearing cage 1 and thus extend the entire rolling bearing. Every intermediate section 6 has substantially a platelet or cuboid shape, which on three sides with the rest of rolling bearing cage 1 connected is.

The radial direction of the rolling bearing cage 1 measured, with D ₆ designated thickness of each intermediate section 6 is compared to the strength measured in the same direction S ₂ of the cage cage 2 reduced. In the same way are the intermediate sections 6 in comparison to the holding arms 3 . 4 , based on their thickness measured in the radial direction D ₆ , weakened. The thickness of the retaining arms measured in the radial direction 3 . 4 true in the embodiments with the strength S ₂ of the cage cage 2 match.

The weakening of the intermediate sections 6 compared to the cage ring 2 as well as to the holding arms 3 . 4 is expressed by depressions 7 . 8th , which on the inner circumference or on the outer circumference of the roller bearing cage 1 are recognizable.

The holding arms 3 . 4 opposite end face of the cage ring 2 points as in 3 can be seen clearly on a substantially flat shape. This flat surface is interrupted by recesses 9 . 10 , which are as blind hole-like depressions in the cage ring 2 extend into each and a holding arm 3 . 4 lie opposite. As well as the holding arms 3 . 4 are the recesses 9 . 10 mirror-symmetrical to one through the Wälzkörpertasche 5 placed mid-plane ME , in the 4 is shown formed. The center axis of the rolling bearing cage 1 , that is, the axis of rotation of the rolling bearing, lies in said center plane ME , Starting from this midplane ME takes in the axial direction of the rolling bearing cage 1 measured depth of each recess 9 . 10 to the edge of the Wälzkörpertasche 5 towards. In the area designated by 11 bottom of the Wälzkörpertasche 5 is thus given an approximately uniform wall thickness.

At the site of the cage cage 2 at this one of the median plane ME is cut, that is in the middle of the Wälzkörpertasche 5 , is one in 5 visible and with D ₁₁ given ground strength, which is the minimum - in the axial direction of the cage ring 2 to be measured - wall thickness of the rolling bearing cage 1 represents. Starting from the point where the soil strength D ₁₁ is present, takes the generally designated W ₅ wall thickness in both circumferential directions, that is to the support arms 3 . 4 out, too.

In both embodiments are wells 7 . 8th both on the inner circumference and on the outer circumference of the roller bearing cage 1 , The rolling-body pockets 5 are each for guiding rolling elements 13 with a diameter D ₁₃ , which is approximately the diameter D ₅ the rolling-body pockets 5 corresponds, provided. At the rolling elements 13 it can be metallic or ceramic rolling elements.

The inside recesses 7 and outside recesses 8th are equally deep, which is synonymous with the intermediate sections 6 centrally between the inner circumference and the outer circumference of the cage ring 2 are arranged. In case of 6 and 7 each runs a total flat intermediate section 6 in the form of a pin 12 out, which in the axial direction of the rolling bearing cage 1 aligned, that is arranged parallel to the axis of rotation of the rolling bearing. The cones 12 are also referred to as Auswerferzapfen and are in particular with regard to the injection molding production of the rolling bearing cage 1 advantageous. Regardless of the presence of a pin 12 , which optionally the intermediate section 6 is attributable to extend the support arms 3 . 4 in the axial direction of the roller bearing cage 1 over the intermediate sections 6 out. This is a favorable compromise between the stability of the entire rolling bearing cage 1 and the required for the assembly of the rolling bearing elasticity of the support arms 3 . 4 reached.

LIST OF REFERENCE NUMBERS

1

Rolling bearing cage

2

cage ring

3

holding arm

4

holding arm

5

rolling body

6

intermediate section

7

Inner recess

8th

Outside recess

9

recess

10

recess

11

ground

12

spigot

13

Ball, rolling elements

D ₅

Diameter of the rolling element pocket

D ₆

Thickness of the intermediate section

D ₁₁

floor thickness

D ₁₃

Ball diameter

ME

midplane

S ₂

Strength of the cage cage

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 102009013978 A1 [0002]
• DE 19937664 A1 [0003]
• DE 102015214850 A1 [0003]
• DE 102013225998 A1 [0003]
• DE 102009032961 A1 [0004]

Claims (10)

Rolling bearing cage (1), with a cage ring (2), from which support arms (3, 4) go out, each of the rolling body (13), namely a ball, provided rolling bearing pockets (5) for captive receiving, wherein the retaining arms (3, 4) in the circumferential direction between the Wälzkörpertaschen (5) by in the axial direction of the cage ring (2) adjoining intermediate portions (6) are interconnected, which are weakened in the radial direction compared to the cage ring (2) and to the support arms (3, 4), characterized in that in the radial direction of the cage ring (2) measured thickness (D ₆ ) of each intermediate portion (6) at least 10% and at most 20% of the diameter (D ₅ ) of the rolling body pocket (5). Rolling bearing cage (1) after Claim 1 , characterized in that the thickness (D ₆ ) of the intermediate portion ( ₆ ) measured in the radial direction of the cage ring (2) is not less than 1 mm and not more than 5 mm. Rolling bearing cage (1) after Claim 1 or 2 , characterized in that the cage ring (2) frontally, each having a holding arm (3, 4) opposite, recesses (9, 10) whose measured in the axial direction of the cage ring (2) depth of the center of the rolling body pocket (5) to the intermediate section (6) increases. Rolling bearing cage (1) according to one of Claims 1 to 3 , characterized in that the thickness (D ₆ ) of the intermediate portion (6) of the measured in the middle of the rolling body pocket (5) soil thickness (D ₁₁ ), that is minimum thickness of the cage ring (2), deviates by no more than 15%. Rolling bearing cage (1) after Claim 4 , characterized in that its wall thickness (Ws) increases from the center of the rolling body pocket (5) towards the retaining arms (3, 4). Rolling bearing cage (1) according to one of Claims 1 to 5 , characterized in that the cage ring (2) protrudes in the radial direction both on its outer circumference and on its inner circumference via the intermediate sections (6), in particular protrudes equidistant. Rolling bearing cage (1) according to one of Claims 1 to 6 , characterized in that the thickness (S ₂ ) of the cage ring (2) measured in the radial direction corresponds to the thickness of the holding arms (3, 4) measured in the same direction. Rolling bearing cage (1) according to one of Claims 1 to 7 , characterized in that the intermediate portions (6) end face, on their side facing away from the cage ring (2), in the form of a pin (12). Rolling bearing cage (1) after Claim 8 , characterized in that the pins (12) are set back relative to a plane applied to the open side of the rolling-element pockets (5) in the direction of the cage ring (2). Rolling, with a designed as a snap cage roller bearing cage (1) Claim 1 , And with a number of rolling elements (13), namely balls, wherein the ball diameter (D ₁₃ ) at least 10 times and at most 20 times the thickness (D ₆ ) of an intermediate portion (6) of the cage ring (2).

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