CN103403378A

CN103403378A - Rolling bearing having at least a flexible ring.

Info

Publication number: CN103403378A
Application number: CN2011800680974A
Authority: CN
Inventors: T.阿达内; S.科迪埃; J-L.加德尔
Original assignee: SKF AB
Current assignee: SKF AB
Priority date: 2011-03-01
Filing date: 2011-03-01
Publication date: 2013-11-20
Also published as: DE112011104988T5; WO2012116736A1

Abstract

The rolling bearing comprises an inner ring 1, an outer ring 2, at least one row of rolling elements disposed between raceways 6, 15a, 15b provided on the rings, and an annular housing 5 inside which at least one of said rings is arranged, said ring being in two parts 2a, 2b. Each of the two parts of said ring delimits with the housing a closed space 21a, 21b. The ratio between the thickness of a guiding portion 13a, 13b of each of the two parts 2a, 2b delimiting the raceway and the outer diameter of the bearing is from 0,7 % to 3 %,and preferably from 1,1 % to 1,9 %.

Description

Rolling bearing with at least one flexible rings

Technical field

The present invention relates to rolling bearing, particularly have inner ring and outer ring and a row or multi-row be for example the rolling bearing of the rolling element of spheroid.Rolling bearing can be for example for the rolling bearing of industrial electro motivation or power car gear-box.

Background technique

These the application in, known normally used be the ISO deep groove ball bearing.These bearings comprise inner ring and the outer ring of bulk or solid type." solid rim " is understood to the circle that obtains by machining (by turning, grinding) removal material from steel pipe material, bar, forging blank and/or rolled blank.

In such application, deep groove ball bearing is mainly radially to carry, and usually has and load a little less than the capacity of the bearing that uses is compared relative thin.Due to the performance of the lower oiling agent of the steel of comparing solid rim, the working life of deep groove ball bearing is lubricated relevant with bearing in fact.

German patent application DE102005033566 discloses rolling bearing very close to each other, and wherein outer ring is comprised of two-part.A part of described outer ring is solid.Another part is to obtain by stamped sheet metal, and limits a space together with the housing that keeps two parts of enclosing, and axially the elastic element of preload is contained in this space.

Use such rolling bearing, about the rolling bearing rated load, radial load situation about increasing under, greatly reduce its working life.

Summary of the invention

A target of the present invention is to overcome these shortcomings.

A special target of the present invention is to provide the rolling bearing that is suitable for the higher radial load of CBR rated load and does not reduce bearing life and easy manufacture and economy.

In one embodiment, rolling bearing comprises inner ring, and outer ring is arranged at least one row's rolling element between the raceway that is arranged on described inner ring and outer ring, and section has arranged the toroidal shell of one of them described circle within it, and described circle is comprised of two parts.Each of two parts and housing define enclosed space.Each thickness and the ratio between the bearing outer diameter of guide portion that limits in two parts of described circle of raceway is from 0.7% to 3%, preferably from 1.1% to 1.9%.

In one embodiment, the ratio between the thickness of each guide portion and rolling element diameter is from 5.5% to 22%, preferably from 8.5% to 15%.

In one embodiment, enclosed space is all empty.

Advantageously, two of described circle parts are identical and about passing the radial plane symmetry at rolling element center.

In one embodiment, each of two parts of described circle comprises with the housing axial component and becomes the outer axial part radially contact, radial component, guide portion and interior axial component, the enclosed space that is limited by the radial flange of the described part of enclosing and housing.

In a preferred embodiment, the radial component of two of described circle parts axially contact each other.

The outer axial part of two parts of described circle can axially contact with the radial flange of housing.

In one embodiment, the interior axial component of two of described circle parts axially contacts with the radial flange of housing.

In a preferred embodiment, each of two of described circle parts has constant thickness.Two parts of described circle can be made with stamped sheet metal or pipe.

In one embodiment, each flexural strength of two of described circle parts reaches 250Mpa.

According on the other hand, a kind of motor or motor are proposed, comprise the rolling bearing of at least one aforementioned definitions.

The accompanying drawing explanation

By research, by non-limitative example, provided and the detailed description of specific embodiment illustrated in the accompanying drawings, the present invention and its advantage will be understood better, and accompanying drawing shows the axial semi-section according to the rolling bearing of example of the present invention.

Embodiment

As shown in scheming above, illustrate the embodiment according to rolling bearing of the present invention, described bearing comprises inner ring 1 and by two exterior parts or half-turn 2a, the outer ring 2 that 2b forms, in the example that illustrates by ball form one row rolling element 3, keep described rolling element and be arranged on inner ring 1 and outer ring 2 between retainer 4.This rolling bearing also comprises half-turn 2a outside two, the ring seal circle of 2b or housing 5.

In this example, inner ring 1 is designed to be arranged on rotating member.Like this, inner ring 1 forms the rotation circle of bearing, and outer ring 2 forms non-rotating circle.Inner ring 1 is solid, and has the solenoid groove 6 that is arranged on its Outer cylindrical face 1a above and is formed for the raceway of rolling element 3.The radius of curvature of groove 6 is slightly larger than the radius of rolling element.Inner ring 1 can be made by machining, or makes by the compacting steel billet, thus its then polishing and at the raceway place selectively polishing its geometric properties and final surface finishment thereof are provided for circle 1.

Retainer 4 comprises a plurality of atriums 7 that linked by outer maintenance pawl 8.Chamber 7 is advantageously spherical, and its slightly larger in diameter is in the diameter of rolling element 3 so that receive and keep rolling element.Chamber 7, around the making on every side of the circumferential body of retainer 4, reserves the heel 9 relative with the opening in each chamber 7.These openings that link by two relative pawls 8 in each example have the width of the diameter that is slightly less than rolling element 3.Rolling element 3 carries out the buckle installation by part jaws 8 flexibly.Alternatively, retainer can have other device that is different from chamber 7 and pawl 8 to keep rolling element.Retainer 4 can be made by molded plastic or metal.

In this embodiment, in order to reduce manufacture cost, two parts 2a of

outer ring

2 and 2b are identical and about the radial plane symmetry of the bearing symmetry at the center of passing rolling element 3.As an alternative, also can predict asymmetrical parts 2a, 2b.These two outer half-

turn

2a, 2b can be advantageously by cutting and stamped sheet metal, and the part of acquisition then hardens and manufactures by heat treatment.Two half-turn 2a, each of 2b has constant thickness.Raceway can then grind and/or thereby polishing provides the surface finishment of geometric properties and restriction for it.Because two half-

turn

2a, 2b are identical in this example, will describe at this for one that in them, only has reference character " a ", should be understood that the similar elements of another half-turn 2b has reference character " b ".

The half-turn 2a of outer ring 2 comprises outer cylinder axial component 11a, ring-type radial component 12a, and helical barrel portion 13a and interior cylinder axis are to part 14a.Radial component 12a is connected to outer axial part 11a and helical barrel portion 13a.Helical barrel portion 13a is defined for the tubular raceway 15a of helical of rolling element 3.Helical barrel portion 13a is formed for the guide portion of rolling element 3.The radius of curvature of raceway 15a is slightly larger than the radius of rolling element 3.Helical barrel portion 13a also is connected to interior axial component 14a.In helical barrel portion 13a used, axial component 14a extended axially towards the outside of rolling bearing.Two outer half-

turn

2a, 2b orientates radial component 12a as, and the radial surface 16a of 12b, 16b roughly, in the radial plane of the symmetry that is in rolling bearing and rolling element 3, axially contact each other.Alternatively, in order to obtain the internal preload of rolling bearing, can predict half-turn 2a, the radial component 12a of 2b, the axial clearance between 12b.

Housing 5, it is advantageously made by stamped sheet metal, comprises two

radial flange

17a, 17b and be connected to two radial flange 17a, the outside axial component 17c of 17b, with around two half-

turn

2a, 2b also will keep them to abut against each other in the axial direction.By two axial component 11a, the radially contact between the hole of 11b and axial component 17c, half-

turn

2a, 2b are centered in the axial component 17c of housing 5.Form two outer axially part 11a, the outer radial surface 18a of the ring-shaped edge of 11b, 18b axially contact respectively the radial flange 17a of housing 5,17b.Form two interior axial component 14a, the outer radial surface 19a of the ring-shaped edge of 14b, 19b axially contact respectively radial flange 17a, 17b.Two

radial flange

17a, 17b inwardly radially extends towards the outer cylinder surface 1a of inner ring 1.

Inward flange

20a, 20b stays radial clearance about described periphery 1a.Each flange 17a, the outer radial surface of 17b is positioned at the radial plane of the sagittal plane that comprises inner ring 1.

Each outer half-

turn

2a, 2b and housing 5 define annular enclosed space 21a, 21b.More specifically, enclosed space 21a is by outer axial part 11a, radial component 12a, and helical barrel portion 13a and interior axial component 14a and in the face of these parts, the part of the radial flange 17a of housing 5 limits.Enclosed

space

21a, 21b are empty, namely do not have oiling agent or other device to be included in these spaces.Oiling agent is foreseen and enters at inner ring 1 and outer half-turn 2a, between 2b, in accommodating radial space of putting rolling element 3.

Each element in rolling bearing is assembled as follows.In case rolling element 3 inserts in the chamber 7 of retainers 4 and integral body has been installed on inner ring 1, two half-

turn

2a, 2b is around these row's rolling element 3 location.In this stage of assembling process, housing 5 has L shaped structure, and the outer cylinder that forms axial component 17c partly is connected to and forms one of radial flange, for example radial component of flange 17b.Therefore then the housing that forms is arranged on two half-turn 2a, on 2b.In case two outer half-

turn

2a, 2b has arranged in place in the L shaped structure of housing 5, the outer cylinder part of housing 5 just is folded to form the second radial flange 17a right with first-phase on the side relative with radial flange 17b, and by two half-

turn

2a, 2b outer axial part 11a separately, 11b and interior

axial component

14a, 14b keeps two half-

turn

2a, and 2b abuts against each other.In case assembling process completes, housing 5 and two outer half-

turn

2a, 2b limits volume or the space 21a of the sky of ring seal, 21b.

The analysis of doing according to the claimant, the identical rate deviation (osculation variation) of finding rolling bearing is obtained, two outer half-turn 2a, the helical barrel portion 13a of 2b, the ratio from 0.7% to 3% of the outer diameter of the thickness of each and housing 5 in 13b, and preferably from 1.1% to 1.9%.

The claimant is definite, in such scope, and due to the load distribution of the inner rolling element of rolling bearing, helical barrel portion 13a, the raceway 15a of 13b, identical rate is out of shape and has been reduced to each of 15b around rolling element 3.Due to this phenomenon, the load capacity of rolling bearing becomes higher.Therefore, than the few a lot of traditional thick and heavy outer solid body of distortion, outer half-turn 2a, the raceway 15a of 2b, the surface of 15b becomes more greatly and the contact that is applied on described raceway by rolling element 3 becomes lower.Therefore surface stress reduces, and the Surface fatigue life-span increases.

In addition, in the situation that the radial load higher than rolling bearing rated load is applied on rolling bearing, outer half-turn 2a, the raceway 15a of 2b, 15b are out of shape and the better rolling element 3 that surrounds.Like this, rolling bearing just can bear higher radial load and not reduce bearing life.Utilize above-mentioned half-turn 2a, the helical barrel portion 13a of 2b, the ratio between the outer diameter of the thickness of 13b and rolling bearing 5, when radial load increased, the flexibility of described circle provided less identical rate and the self adaption between raceway and rolling element to interact.Therefore, outer half-turn 2a, each of 2b has the identical rate design of adaptability, and it makes the impact that has reduced the radial load increase that is applied on rolling bearing.As previously mentioned, two half-

turn

2a, 2b has constant thickness.Half-turn 2a, the ratio between the thickness of 2b and rolling bearing external diameter is from 0.7% to 3%, and preferably from 1.1% to 1.9%.

Guide portion

13a, 13b each thickness and the ratio between the diameter of rolling element 3 be from 5.5% to 22%, and preferably from 8.5% to 15%.For example have for housing that outer diameter equals 130mm and rolling element 3 has the rolling bearing that diameter equals 17.462mm, half-turn 2a, the thickness of 2b can be included between 1.48 to 2.6mm, and preferably equals 2mm.Two half-turn 2a, in 2b, the flexural strength of each can be up to 250MPa.Described two half-turn 2a, in 2b, the strain intensity of each is 0.01% distortion before plastic deformation.

In the disclosed embodiment, outer ring 2 comprises two half-

turn

2a, 2b and inner ring 1 is solid type.Replacedly, also can outer ring be solid and inner ring can by with the disclosed embodiments in half-turn 2a, two half-turns that the similar method of 2b is made form.Two half-turns of inner ring can be arranged on the housing inboard.This layout with shown in embodiment identical, but element is put upside down.In another embodiment, each comprises two half-turns that are enclosed in as described previously enclosure interior also can to have inner ring and outer ring.In such embodiments, rolling bearing has the space of the sky of four sealings.

Although the present invention illustrates having on the rolling bearing basis of single ball, should be understood that the present invention can not do large change and be applied on the bearing that uses a few row's rolling elements.The present invention also can be applied on dissimilar ball bearing, for example angular contact bearing or the bearing that certainly aligns in addition.

Claims

1. rolling bearing, comprise: inner ring (1), outer ring (2), be arranged in the raceway (6 that is arranged on described inner ring and outer ring, 15a, at least one row's rolling element (3) 15b), and section has arranged the toroidal shell (5) of one of them described circle within it, described circle is by two parts (2a, 2b) form, it is characterized in that: each of two parts of described circle and housing define enclosed space (21a, 21b), and limit raceway (15a, two parts (2a 15b), guide portion (the 13a of each 2b), ratio between thickness 13b) and bearing outer diameter is from 0.7% to 3%, preferably from 1.1% to 1.9%.

2. rolling bearing according to claim 1, wherein, the ratio between the diameter of the thickness of each guide portion (13a, 13b) and rolling element (3) is from 5.5% to 22%, preferably from 8.5% to 15%.

3. rolling bearing according to claim 1 and 2, wherein, enclosed space (21a, 21b) is all empty.

4. according to the described rolling bearing of any one in aforementioned claim, wherein, two parts (2a, 2b) of described circle are identical and about passing the radial plane symmetry at rolling element (3) center.

5. according to the described rolling bearing of any one in aforementioned claim, wherein, two parts (2a of described circle, 2b) each comprises the outer axial part (11a that becomes radially to contact with the axial component (17c) of housing, 11b), radial component (12a, 12b), guide portion (13a, 13b) with interior axial component (14a, 14b), by the described part of circle and the radial flange (17a of housing, the enclosed space (21a, 21b) that 17b) limits.

6. rolling bearing according to claim 5, wherein, the radial component (12a, 12b) of two parts of described circle is axially contact each other.

7. according to claim 5 or 6 described rolling bearings, wherein, the outer axial part (11a, 11b) of two parts of described circle and the axially contact of the radial flange (17a, 17b) of housing.

8. according to the described rolling bearing of any one in aforementioned claim 5 to 7, wherein, the interior axial component (14a, 14b) of two parts of described circle axially contacts with the radial flange (17a, 17b) of housing.

9. according to the described rolling bearing of any one in aforementioned claim, wherein, each of two parts (2a, 2b) of described circle has constant thickness.

10. according to the described rolling bearing of any one in aforementioned claim, wherein, two parts (2a, 2b) of described circle are made by stamped sheet metal or pipe.

11. according to the described rolling bearing of any one in aforementioned claim, wherein, the flexural strength of each of two parts (2a, 2b) of described circle reaches 250Mpa.

12. motor or motor, comprise that at least one is according to the described rolling bearing of any one in aforementioned claim.