DE102009037422A1 - Cage segment for a plastic cage of a rolling bearing and rolling bearing with such a cage segment - Google Patents

Abstract

The invention relates to a cage segment of a plastic cage for a roller bearing, in particular for a large roller bearing designed as a radial deep groove ball bearing. The cage segment comprises two outer webs (17) and at least two connecting webs (18) connecting the outer webs (17) to one another, a pocket (19) for receiving a rolling element (04) being formed between the outer webs (17) and two connecting webs (18) is. According to the cage segment is divided in the axial direction. An axial coupling element (12, 13) is provided at a connection point (09). The invention also relates to a rolling bearing with a cage according to the invention.

Description

Field of the invention

The The invention relates to a cage segment for a Plastic cage according to the preamble of claim 1. Generic cage segments comprise two concentric circumferential ridges and arranged therebetween Connecting webs. In each case between two connecting webs and the Circumferential webs is a pocket for receiving a rolling element educated. The invention particularly relates to a cage segment for a radial deep groove ball bearing, which under operating temperatures be operable to 150 ° C and a pitch circle diameter greater than 500 mm.

such Plastic cage segments are of the prior art known for a long time and especially because of their low Weight and cost-effective production appreciated. There are different solutions, source or temperature expansions allow the cage material and thus high voltages in cage and bearing to prevent which by itself more thermally expanding plastic material of the cage as the rest of steel usually made of steel Components of the rolling bearing are caused.

The DE 102 46 825 A1 describes a plastic cage consisting of several segments. The cage described is particularly suitable for use in very large bearings with relatively small rolling elements. The cage segments lie loosely against one another at their outwardly directed concave end faces. The dimensioning of the segments is to be selected so that in a gap-free juxtaposition of the segments between the adjacent end faces of the first and the last segment, a gap remains to accommodate a swelling and / or temperature-induced expansion of the segments. However, the potential gap between the cage segments has the disadvantage that during operation in and between the cage segments higher forces occur, which can lead to a plastic deformation or cracking of the cage segments. Increased bearing friction, noise, temperatures and thus a shortened bearing life are the result.

From the DE 10 2006 022 951 A1 and the DE 10 2007 048 655 A1 plastic cage segments are known for large bearings, which carry coupling elements on the front sides in order to achieve a play-related connection of the segments to the cage. Due to the even distribution of the play between the cage segments, mechanical stresses can be avoided. The described cage segments are designed for tapered roller bearings.

The The object of the invention is a cage segment for a plastic cage, in particular for a radial deep groove ball bearing (single or multi-row) to provide, with particular value on a simple installation with a self-holding rolling bearing Value is placed. Furthermore, an improved leadership of the cage in the rolling bearing can be achieved. A Another object is to be seen in a radial deep groove ball bearings ready with a plastic cage formed from segments to deliver.

The Task is characterized by a cage segment with the characteristics of Claim 1 and by a rolling bearing having the features of Claim 13 solved.

One Cage segment according to the invention first in a known manner two outer webs, which are interconnected by connecting webs. For Radial deep groove ball bearings are the outer webs offset axially. Several segments can be connected to form a cage. For this purpose, the segments on their end faces coupling elements, the each connected to the coupling element of the next segment become. Preferably, on a first end face, a first coupling element and a second coupling element is provided on a second end face, each complementary shaped and positively can be connected to each other. This is a simple connection to a cage (ring) possible.

Each between the outer webs and two connecting webs are Cage pockets for receiving a rolling element educated. The connections at the coupling points are with a clearance fit Mistake. This can cause a swelling or thermal expansion of the cage formed by several segments in the coupling elements be absorbed without mechanical stresses. The clearance has a size which is one Swelling or temperature expansion of the cage material in corresponds to a predetermined tolerance range. Per cage segment one or more pockets may be formed.

According to the invention, the cage segment has an axial pitch with a connection point. The connection point can be provided either between one of the outer webs and the connecting webs of the other outer web or in each case in the connecting webs and should preferably not be able to be separated without destruction. The connection point is executed in a preferred embodiment as a snap or snap connection and geometrically designed so that the joining takes place under a certain compressive force and an independent decoupling can not be done. If the connection point is provided in the middle of the raceway in the connecting webs, this must be formed in the circumferential direction so that no ne contact with the rolling element takes place. Optionally, the joint is geometrically reset from the track.

The Advantages of the invention are to be seen in particular in that the Assembly of the rolling bearing with a plastic cage is simply possible. These are the rolling elements first inserted between the two bearing rings. Subsequently become the cage segments divided in the axial direction, preferably before in the direction of rotation to a "half" cage were joined together, from both sides of the bearing placed between the Wälzköper and each other connected. The connection point in the circumferential direction is preferably constructively designed so that the connection when crossing solve a limiting force and fall below the same also connect again or can engage. Preferably, the Connection point as snap connection, rivet or screw connection executed.

The Guiding the cage formed from the segments takes place via the board surfaces of the warehouse and / or over the rolling elements. Here is the touch the rolling elements in the cage pocket geometrically so to solve that the rolling elements (eg. the ball) to the right and left of his largest Diameter touches the cage pocket. The half Ball diameter should run freely in the middle. This is done no stripping of the lubricant.

Preferably The segment is over guide knobs or webs both outward and inward to the onboard diameters held and guided in his position.

In In a preferred embodiment, the guide webs designed in skid shape to the friction and sliding on the Improve board surfaces.

One Inventive rolling bearing, in particular a radial deep groove ball bearing comprises an inner ring, an outer ring and between them arranged in a cage rolling elements, the cage being composed of the previously described segments is. Advantageously, the board surfaces on Outer ring sanded to improve the sliding properties be. The person skilled in the art knows the variants of the geometric design such cages, therefore, on details of these not discussed in more detail.

The Outside bars are tuned in height so that still a sufficiently large space remains, through a lubricant can be supplied to the camp interior.

At the connecting webs, the wall thicknesses are designed so that rolling element, especially a sphere a cage touched only in a small diameter range and that Segment even in this area touched by the bullets and is guided. This will cause the lubricant to wipe off largely prevented.

The Invention will be explained in more detail with reference to FIGS. Show it:

1 a schematic representation of a rolling body guided, made of segments plastic cage according to the invention;

2 a schematic representation of a board-guided, formed from segments plastic cage according to the invention;

3 five schematic diagrams of an axial junction of a cage segment;

4 : four variants of radial coupling elements in spatial representations.

1 shows a schematic representation of a detailed view of a radial deep groove ball bearing with a rolling body guided plastic cage. The bearing comprises in a known manner an outer ring 01 and an inner ring 02 , which concentric with a bearing bore 03 are arranged. Several balls 04 are as rolling elements between outer ring 01 and inner ring 02 in a career 06 arranged and held. The camp is self-holding. The balls 04 are made by a plastic cage consisting of several cage segments 07 is composed, kept at a distance.

The cage segment 07 includes radial coupling elements 08 , with which several cage segments are connectable to a cage. The radial coupling elements 08 are executed in principle known type and will be explained in more detail below. The cage segment 07 is divided according to the invention in the axial direction and at a junction 09 connectable.

The leadership of the cage is done by the balls 04 via guide elements, not shown.

During assembly of the bearing the balls become 04 first between inner ring 02 and outer ring 01 inserted. After that, the cage segments divided in the axial direction become 07 introduced by two bearing side surfaces between the rolling elements. Preferably, the split cage segments are first assembled into partial rings and then the axial connection between the partial rings produced.

2 also shows in schematic Dar a radial deep groove ball bearing with a board-guided plastic cage. The bearing has basically the same known structure, therefore, the same components carry the same reference numerals, as in 1 ,

The leadership of the cage takes place on board surfaces 10 of the inner ring 02 and the outer ring 01 , As guide elements here are different from those in 1 illustrated embodiment guide webs 11 for guiding the cage on the board surfaces 10 educated. Preferably, the guide webs 11 formed skid-shaped to minimize frictional forces.

In 3 are several exemplary possibilities of the axial connection point 09 shown. In this case, Fig. A) to d) snap connections and Fig. E) shows a screw or rivet connection, in each case in a sectional view and a plan view. Of course, combinations of snap and screw or rivet can be selected.

The snap connections are each with complementarily shaped axial coupling elements 12 . 13 which have the following different cross-sectional shapes: Fig. a) rectangular, Fig. b) spherical, Fig. c) semicircular, Fig. d) disc-shaped (rectangular cross-section).

In Fig. E) is a connection by means of connecting means 14 (Rivets, pins, screws or the like) shown, which must be secured against loosening by known means. In addition, a positive mounting aid 16 be provided.

In 4 various possibilities of radial coupling elements are shown. The figures each show a cage segment with outer webs 17 , which by connecting webs 18 connected to each other.

Between the connecting bridges 18 are bags 19 each formed for receiving a rolling element.

On one of the front sides 21 of the cage segment are in extension of the outer webs 17 coupling webs 22 intended. At the opposite end face, the outer webs 17 Koppelausnehmungen 23 on, in which the corresponding coupling webs 22 can engage a further identically constructed cage segment. In the area of the coupling webs 22 are latching projections 24 provided, which in recesses 26 the coupling recess 23 engage during assembly. The breakdown into such segments facilitates the production especially for large bearing diameters.

The various design options are shown in the other figures. Fig. B) shows that the coupling webs 22 the recesses 26 have, in which locking projections 24 of the next cage segment can engage. In this case, protrude in this embodiment, the locking projections 24 in the longitudinal direction of the cage segment in each case to the outside. In the detailed representation of Fig. B) it can be seen that the latching projection 24 within the recess 26 a game s in the circumferential direction of the cage segment has to accommodate expansions can.

Fig. C) shows an asymmetrical design of the radial coupling elements. At each of the front ends 21 are each a coupling bridge 22 and a coupling recess 23 intended. The coupling webs 22 wear the locking projections 24 while at the coupling recesses 23 the recesses 26 are provided.

In Fig. D) a dovetail-like radial coupling point is shown, in which on the coupling webs 22 dovetailed recesses 26 are formed while on the coupling recesses 23 complementarily shaped latching projections 24 are provided.

guide elements for ball guides are not closer explained because those skilled in the art are familiar.

LIST OF REFERENCE NUMBERS

01

outer ring

02

inner ring

03

bearing bore

04

Bullet

05

06

career

07

cage segment

08

Radial coupling elements

09

junction

10

board area

11

guide web

12

Axial coupling element

13

Axial coupling element

14

connecting means

15

16

mounting aid

17

outer web

18

connecting web

19

bag

20

21

front

22

coupling web

23

coupling recess

24

catch projection

25

26

recess

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 10246825 A1 [0003]
• - DE 102006022951 A1 [0004]
• - DE 102007048655 A1 [0004]

Claims (14)

Cage segment of a plastic cage for a roller bearing, in particular for a slewing bearing, with at least two outer webs ( 17 ) and at least two the outer webs ( 17 ) interconnecting connecting webs ( 18 ), in each case between the outer webs ( 17 ) and two connecting webs ( 18 ) a pocket ( 19 ) for receiving a rolling element ( 04 ) is formed, characterized in that the cage segment is divided in the axial direction prior to assembly and during assembly at a connection point ( 09 ) via an axial coupling element ( 12 . 13 ) is connected. Cage segment according to claim 1, characterized in that the axial coupling element ( 12 . 13 ) between each of the connecting webs ( 18 ) and one of the outer webs ( 17 ) is provided. Cage segment according to claim 1, characterized in that the axial coupling element ( 12 . 13 ) each at the connecting webs ( 18 ) is provided. Cage segment according to one of claims 1 to 3, characterized in that each of the connecting webs an axial coupling element ( 12 . 13 ) having. Cage segment according to one of claims 1 to 4, characterized in that the axial coupling element ( 12 . 13 ) is a snap connection and / or a rivet connection or a screw connection. Cage segment according to claim 5, characterized in that the snap connection by two complementary shaped coupling elements ( 12 . 13 ) is formed. Cage segment according to claim 6, characterized in that the coupling elements ( 12 . 13 ) are formed in their cross section rectangular, spherical, semicircular or oval. Cage segment according to one of claims 1 to 7, characterized in that it at its end faces ( 21 ) Radial Coupling Elements ( 22 . 23 . 24 . 26 ) for chaining a plurality of cage segments into a cage. Cage segment according to one of the claims 1 to 8, characterized in that there are guide elements for guiding the cage in the rolling bearing. Cage segment according to claim 9, characterized that the guide elements with the rolling elements correspond. Cage segment according to claim 9 or 10, characterized in that the guide elements with flange surfaces ( 09 ) correspond to the rolling bearing, the one or both sides of the running surfaces on the inner ring ( 02 ) and / or on its outer ring ( 01 ) are formed. Cage segment according to claim 11, characterized in that the guide elements as skid-shaped guide webs ( 11 ) to the outer or inner ring ( 01 . 02 ) are formed. Rolling bearings, in particular radial deep groove ball bearings with an inner ring ( 02 ), an outer ring ( 01 ) and between them arranged in a cage rolling elements ( 04 ), characterized in that the cage is composed of cage segments according to one of claims 1 to 11. Rolling bearing according to claim 13, characterized in that the outer ring ( 01 ) has ground board surfaces.

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