DE102010008650A1 - Bearing ring for roller bearing, is provided with continuous circumferential tracks, in whose region roller contact takes place - Google Patents

Abstract

The bearing ring is provided with the continuous circumferential tracks (5,6), in whose region a roller contact takes place. The bearings (7,9) have a relative wall thickness relative to the wall thickness of the total corpus of bearing rings. The material of the former bearing has certain compressive strength. The material of the former bearing has a module of certain elasticity. An independent claim is also included for a roller bearing.

Description

Field of the invention

The The invention relates to a bearing ring according to the preamble of the claim 1 for a rolling bearing, a bearing ring with a Carrier and a track according to claim 11, and a rolling bearing according to claim 12.

Out In practice, bearing rings are known which have a track as a surface section having the body of the bearing ring, wherein in the region of the raceway a contact with another component of the warehouse occurs. This other body of the camp is in the case of Rolling bearing a rolling element, in the field the raceway of the rolling bearing bearing ring in rolling contact with the surface of the body of the rolling bearing race occurs.

For Rolling bearing is known that the bearing rings have a body, the massive one steel, in particular a bearing steel, which corresponds to the requirements of the rolling bearing Steel, especially bearing steel, due to its mechanical properties and tribological peculiarities for the field of career of the bearing ring as material for the entire body of the Bearing ring is chosen to be in the range of the raceway Lagerrings, so only a portion of the surface of the Body of the bearing ring occurring operating conditions, invoice to wear. Steel, especially bearing steel, has a high Density, so that bearing rings for especially large storage, So for bearings with a diameter of more than about 1000 millimeters, get a high weight. Steel and made of steel Rolled bearing steel can be temporarily scarce and thus represent expensive raw materials.

US 5,866,647 A describes a bearing ring for a rolling bearing, wherein the entire body of the bearing ring is made of a fiber-reinforced plastic, so that also in the region of the raceway, the fiber-reinforced plastic forms the friction partner for the rolling contact. Fiber-reinforced plastics can change their properties under high mechanical loads, so that its properties are difficult to predict when the bearing ring is in operation.

DE 101 24 534 A1 describes a bearing ring for a rolling bearing or a sliding bearing, wherein the body of the bearing ring comprises a raceway of a glass or of a glass ceramic, and the glass is sprayed onto a metallic body as a carrier. In this case occurs during operation of the bearing of the contact with the glass or with the glass ceramic, the wear properties of which differ significantly from those of the well-known rolling bearing steel.

DE 202 00 241 U1 describes a bearing ring for a rolling bearing, wherein a carrier made of a plastic or a fiber composite material is provided, and wherein on the carrier a body of a track is arranged. The body of the track each comprises a running wire of steel wire, on which a rolling contact with a rolling element takes place, wherein the running wire is substantially thinner than the carrier. Such an arrangement has in particular in the case of large rolling bearings do not transmit sufficient stability to accommodate the forces transmitted to the career during operation of the large rolling bearing permanently.

DE 10 2007 062 145 A1 describes a bearing ring for particular slewing bearings, wherein the bearing ring is formed by segments joined together, so that two adjacent segments form a joint, which leads in particular in Wälzkontakt to a rough running.

Object of the invention

It The object of the invention to provide a bearing ring, the Properties of the steel in the area of the track maintains and improved, in particular adaptable to the specific case of operation, Features get.

Summary of the invention

These Task is inventively by a bearing ring with the features of claim 1 or 11 for a rolling bearing solved according to claim 12.

The The provisions of the characterizing portion of claim 1 ensure that that the bearing ring in two parts, namely from the raceway and the wearer, is formed so that the total resulting bearing ring has properties that at least the operational Properties that are completely made of steel, especially bearing steel trained bearing ring shows. For the selection of the material of the carrier or for the design of the carrier exists respectively a degree of freedom that can be exploited to form a two-part or to obtain a multi-part bearing ring whose properties are opposite completely made of steel, in particular completely from bearing steel, produced bearing ring improved are.

The proviso that the carrier is formed as a circular ring and a relative wall thickness, based on the wall thickness of the entire body of the bearing ring, of at least about 0.44, in particular at least about 0.55, has, in particular for the application of the rolling bearing certain that the forces occurring during the rolling over of the raceway can be absorbed, since these forces are to a depth of at least approximately 50% of the total Di can be registered bridge of the bearing ring. Therefore, the carrier must absorb only relatively small forces and can be selected in terms of its material to the effect that it is easy to build and inexpensive to produce at the same time.

The Provided that the material of the carrier is a compressive strength of at least about 480 MPa, in particular at least about 600 MPa, has, ensures that along the contact surface between the body of the carrier and the body of the bearing ring occurring tensile or compressive forces from the carrier can be absorbed so far that the material of the Carrier remains undamaged and the bearing in case of operation the same load capacity as a complete bearing made of the material of the raceway.

The Provided that the material of the carrier has a modulus of elasticity of at least about 40 GPa, in particular at least about 50 GPa, ensures in the area of the contact surface between the body Tangential stresses occurring in the carrier and the body of the bearing ring can be safely taken, so that the composite out the carrier and the bearing ring is permanently stable and the bearing has a similar stiffness to the outside.

The The invention further comprises a bearing ring comprising a raceway with a body made of an embroidered, martensitic cold-work steel, in particular from a martensitic hardenable nitrogen-alloyed Steel containing at least 0.2% carbon and nitrogen and at least 13% chromium, a carrier made of a tempered steel, a case hardening steel or an austenitic steel, wherein the body the raceway is attached to the carrier. Such a Bearing ring provides, even in the event that the relative Wall thickness of the carrier, based on the wall thickness of the entire bearing ring is less than about 0.44, one safe absorption for those occurring during operation with the rollover Forces. Such a bearing ring is preferably for provided the case that the diameter of the bearing ring some Decimeter (as known for railway camp, for example) or a few meters (as for wind turbine applications common). Preferably, such is Bearing ring part of a rolling bearing that continues rolling elements made of a ceramic material. Alternative to the body The raceway made of cold-work steel is intended to be the body the track of a high-speed steel, in particular a powder metallurgical manufactured high-speed steel.

Preferably is provided that the material of the wearer in relation on the material of the bearing ring, namely in relation to steel and in particular bearing steel is chosen so that the density of the material of the carrier is significantly lower is considered the density of the material of the track. The total surviving Bearing ring thus has a lower weight than the complete made of steel, in particular bearing steel Bearing ring. Preferably, for the material of the career provided that that the material of the career one embroidered, martensitic cold work steel, in particular a martensitic hardenable nitrogen-alloyed steel with at least 0.2% each Carbon and nitrogen and at least 13% chromium. The material of the carrier can in a particularly preferred embodiment a plastic, a ceramic, a light metal, especially aluminum or titanium, or a fiber composite, especially a carbon fiber, a ceramic fiber or a glass fiber reinforced plastic, include. If the carrier consists in particular of the fiber composite material, The carrier may be on the outer circumference of the carcass the career be applied by a winding process, in which the fibers from the matrix saturate the circumference of the raceway be applied circumferentially in layers and in the following curing expires, leaving a firm connection between the body the career and the carrier takes place in particular a positive and non-positive connection in the field of forms common contact surface. The carrier from the plastic or the ceramic can be, for example spray or deposit the light metal as well as the plastic that Ceramics or the fiber composite material as a prefabricated circular ring provide with the annular body of the Bearing ring with positive locking or frictional or force-locking, For example, by means of shrinking, is joined to a solid composite.

Preferably is with regard to the selection of the material of the carrier provided that the material of the carrier is a ferrous material includes, in particular a gray cast iron. The carrier may, for example completely manufactured as a circular ring from a gray cast iron be, with the body of the carrier positive or frictional attached to the body of the bearing ring.

When Alternative to a carrier made of a ferrous material such as Cast iron is preferably provided that the material of the carrier a tempered steel, a case hardening steel or an austenitic one Steel covers.

It is preferably provided that the material of the carrier comprises a glass, in particular a technical glass such as a borosilicate glass or a quartz glass. The body of the carrier may in particular consist entirely of the glass, especially of the technical glass such as the boron-silicate glass or quartz glass, wherein the carrier is a glass ring is provided, which is positively or frictionally secured to the body of the track. It is understood that the glass may also be applied to the body of the raceway by means of a sol-gel process or a wet-chemical deposition process.

Preferably is provided that the material of the carrier carbon in the form of nanotubes. These nanotubes For example, the glass, the plastic, the ceramic or be added to the fiber composite material; Alternatively, you can provided the nanotubes as compressed powder become.

Preferably is provided that the bearing ring for a slewing bearing is provided, in particular, that the bearing ring has a diameter of more than about 1000 millimeters, so in particular the weight savings advantageous.

Regarding of the rolling bearing is provided that at least one of both bearing rings, preferably both bearing rings are designed so that a track and a trained as a circular ring, on the track fixed support is provided, wherein for the Material of the carrier the up in terms of elastic modulus or compressive stresses specified parameter ranges are met, and wherein the relative wall thickness of the carrier, based on the wall thickness of the entire bearing ring, at least about 0.44, in particular at least about 0.55.

Further Advantages and features of the invention will become apparent from the dependent Claims and from the description of exemplary embodiments.

The Invention will be described below with reference to the appended Drawings described and explained in detail.

Brief description of the drawings

1 shows a schematic representation of a first embodiment of a bearing ring according to the invention in a first embodiment of a bearing according to the invention, and

2 shows a schematic representation of a second embodiment of a bearing ring according to the invention in a second embodiment of a bearing according to the invention.

Detailed description the drawings

1 shows a rolling bearing 1 that has a first bearing ring 2 , the outer ring of the rolling bearing 1 is formed, and a second bearing ring 3 , the inner ring of the rolling bearing 1 is formed comprises. The rolling bearing 1 further comprises cylindrical rolling elements 4 who are on a first career 5 on the outer ring 2 as well as on a second career 6 on the inner ring 3 unroll, leaving a rolling contact with the two raceways 5 . 6 , in the operation of the warehouse 1 occurs. The inner ring 3 has a bearing board, which the rolling elements 4 in the axial direction, ie in the direction of the axis of rotation of the rolling bearing 1 , namely perpendicular to the plane of the paper in the representation of 1 , secures.

The two careers 5 . 6 the two bearing rings 2 . 3 are each formed as an annular body, wherein the contact surface to the rolling elements 4 , at which the rolling contact takes place, a partial section of the rolling elements 4 forming surface of the respective body. The respective body of the two raceways 5 . 6 is formed entirely of a steel, in particular of a bearing steel, so that the rolling contact of the rolling elements 4 with the rolling bearing steel of the two raceways 5 . 6 takes place.

The rolling bearing 1 is designed as a slewing bearing, so that each of the two bearing rings 2 . 3 has a diameter of more than 1000 millimeters.

In the following, in particular, the first bearing ring 2 , ie the outer ring of the rolling bearing 1 , with the first career 5 , described in more detail, with the understanding that the information corresponding to the second bearing ring 3 , ie the inner ring of the rolling bearing 1 , with the second career 6 to be transferred.

The bearing ring 2 includes in addition to the career path 5 a carrier 7 which comprises an annular body attached to the body of the track 5 along a common contact surface 9 is attached. The bearing ring 2 is thus constructed in two parts and consists of the track 5 as well as from the on the career 5 fastened carrier 7 , It is the on the career 5 pointing side of the vehicle 7 at the on the carrier 7 pointing side of the track 5 fixed so that the along the circumference of the annulus continuous contact surface 8th to the carrier 7 is formed, in such a way that between the carrier 7 and the corpus of the career 5 no cavity is formed. The carrier 7 as well as the career 5 are thus in the circumferential direction of the bearing ring 2 undivided trained. Likewise, the carrier 7 and the career 5 in the direction of the axis of rotation of the bearing ring 2 , ie in the presentation of 1 perpendicular to the plane of the paper, one-piece.

The carrier 7 is made of a fiber composite material, especially a glass fiber reinforced plastic, formed, for applying the carrier 7 on the outward facing side of the track 5 the fibers soaked with the resin were wound around the outward-facing side, resulting in a multi-layered composite, which firmly adheres to the raceway during subsequent curing 5 remains. The wall thickness of the carrier 7 is about two-thirds of the total wall thickness of the bearing ring 2 ,

The second bearing ring 3 also has a carrier 9 on, at a common contact area 10 to the second career 6 is fixed in the direction of rotation without intermediate cavities. The carrier 9 also consists of a fiber composite material, in particular of the same material as the carrier 7 of the first bearing ring 2 , The second carrier 9 also has a wall thickness, which is about 50% of the wall thickness of the second bearing ring 3 is, measured at a point where none of the shelves is provided.

Through the fiber composite material of the two carriers 7 . 9 have the two bearing rings 2 . 3 in each case a weight which is significantly lower than the weight of a bearing ring, which is completely formed with the same outer dimensions of the steel, in particular the bearing steel.

In the first embodiment described above, the carriers made of the fiber composite material were 7 . 9 by a winding process on the of the rolling elements 4 continuing side of the respective raceways 5 . 6 been applied. It is understood that the carrier 7 . 9 can also be designed as prefabricated moldings into which the raceways 5 . 6 be inserted so that a positive or frictional or non-positive connection between the respective carrier 7 . 9 and the respective career 5 . 6 formed.

Unless the carrier 7 . 9 is designed as a prefabricated molded part, it is further understood that the carrier may be made of a plastic, a ceramic, a glass or a metal, in particular a light metal such as titanium or aluminum, or an iron-based metallic material such as gray cast iron.

is the carrier in particular made of plastic, ceramic or glass made, it is understood that the carrier by a Injection process or by a deposition method, in particular a Wet chemical deposition, applied to the track can be.

In the first embodiment described above, the carrier was 7 . 9 in each case exclusively from the fiber composite material. It is understood that the carrier may comprise a plurality of components, in particular the carrier itself may comprise two or more mutually attached layers. It is further understood that additives such as carbon nanotubes may be added to the material of the carrier.

In the second embodiment described below ( 2 ) denote like reference numerals the same or comparable in their technical function elements.

2 shows a longitudinal section through a rolling bearing 1 that has a first bearing ring 2 , the outer ring of the rolling bearing 1 is formed, and a second bearing ring 3 , the inner ring of the rolling bearing 1 is formed comprises. The rolling bearing 1 further comprises cylindrical rolling elements 4 from a ceramic material.

The first bearing ring 2 includes a career 5 , to whose to the rolling elements 4 pointing surface portion a rolling contact with the rolling elements 4 occurs. The first bearing ring 2 further comprises a carrier 7 , The circular body of the track 5 is on the annular body of the wearer 7 fastened, namely by shrinking the carrier 7 on the corpus of the career 5 , The thickness of the carrier 7 is about two thirds of the thickness of the entire first bearing ring 2 that's what the wearer points to 7 a relative thickness of about 0.67. The circular body of the track 5 is made of a martensitic hardenable nitrogen-alloyed steel with at least 0.2% carbon and nitrogen and at least 13% chromium. The circular body of the carrier 7 is made of tempered steel. Instead of tempered steel could be the body of the wearer 7 also be made of case hardened steel or austenitic steel.

The second bearing ring 3 includes a second career 6 , whose annular body one on the rolling elements 4 having facing surface on which the rolling contact with the rolling elements 4 occurs. The second bearing ring 3 further comprises a second carrier 9 , whose toroidal body on the body of the second career 6 is attached. The corpus of the second career 6 is on the second carrier 9 attached by shrinking. The second career 6 consists of a martensitic hardenable nitrogen-alloyed steel, each with at least 0.2% carbon and nitrogen, and at least 13% chromium. Next, there is the second carrier 9 made of case-hardened steel, alternatively to case-hardening steel made of tempered steel or austenitic steel. The relative thickness of the second carrier 9 , based on the thickness of the entire second bearing ring 3 , is about 0.67.

This is 2 schematically illustrated bearings 1 has an outer diameter of a few decimeters, so that the rolling bearing 1 the Ab has measurements of typical railroad bearings. The rolling bearing 1 could also have dimensions of about one meter or a few meters, so in this case the rolling bearing 1 the dimensions of typical bearings for example, wind turbines has.

The warehouse 1 also includes a side window 11 covering the end faces of the two bearing rings 2 . 3 covered. The side window 11 is by means of fastening screws 12 on the carrier 7 of the first bearing ring 2 attached. These fixing screws 12 offers the case-hardening steel of the carrier 7 a secure hold.

The invention has been described above with reference to a second embodiment in which the relative thickness of the carrier 7 respectively. 9 about 0.67, so the carrier 7 . 9 thicker than the track 5 . 6 is. To be covered by the invention is to be the case that the carrier 7 . 9 a smaller thickness than the raceway 5 . 6 includes, including the case that the carrier 7 . 9 has a relative thickness of less than about 0.44.

The invention has been described above with reference to a second embodiment in which the body of the track 5 . 6 was formed from a martensitic hardenable nitrogen-alloyed steel, each with at least 0.2% carbon and nitrogen and at least 13% chromium. It is understood that the corpus of the career 5 . 6 may consist of another embossed, martensitic cold work steel.

In the second embodiment described above, the body was the raceway 5 . 6 formed from a martensitic hardenable nitrogen-alloyed steel, each with at least 0.2% carbon and nitrogen and at least 13% chromium. Alternatively, it may be provided that the body of the raceway 5 . 6 is made of a high-speed steel, in particular a high-speed steel produced by powder metallurgy.

LIST OF REFERENCE NUMBERS

1

roller bearing

2

outer ring

3

inner ring

4

rolling elements

5

first career

6

second career

7

carrier

8th

contact area

9

second carrier

10

second contact area

11

side window

12

mounting screws

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

• US 5866647 A [0004]
• - DE 10124534 A1 [0005]
• - DE 20200241 U1 [0006]
• DE 102007062145 A1 [0007]

Claims (14)

Bearing ring for a rolling bearing ( 1 ), comprising a continuous circulating track ( 5 . 6 ), in the region of which a rolling contact takes place, wherein the material in the region of the track is suitable for rolling applications steel, in particular a rolling bearing steel, and a carrier ( 7 . 9 ) from one of the material of the track ( 5 . 6 ) different material, the track ( 5 . 6 ) on the carrier ( 7 . 9 ), characterized in that the carrier ( 7 . 9 ) a relative wall thickness, based on the wall thickness of the entire body of the bearing ring ( 2 . 3 ), of at least about 0.44, in particular at least about 0.55, that the material of the carrier ( 7 . 9 ) has a compressive strength of at least about 480 MPa, in particular at least about 600 MPa, and that the material of the carrier ( 7 . 9 ) has a modulus of elasticity of at least about 40 GPa, in particular at least about 50 GPa. Bearing ring according to claim 1, characterized in that the density of the material of the carrier ( 7 . 9 ) is significantly less than the density of the material of the track ( 2 . 3 ), in particular, that the material of the carrier ( 7 . 9 ) comprise a plastic, a ceramic, a light metal, especially aluminum or titanium, or a fiber composite material, especially a carbon fiber, a ceramic fiber or a glass fiber reinforced plastic. Bearing ring according to claim 1 or 2, characterized in that the material of the carrier ( 7 . 9 ) comprises an iron material, in particular a gray cast iron. Bearing ring according to claim 1 or 2, characterized in that the material of the carrier ( 7 . 9 ) comprises a tempered steel, a case hardening steel or an austenitic steel. Bearing ring according to claim 1 or 2, characterized in that the material of the carrier ( 7 . 9 ) comprises a glass, in particular a technical glass such as borosilicate glass or quartz glass. Bearing ring according to one of claims 1 to 5, characterized in that the material of the carrier ( 7 . 9 ) Comprises carbon in the form of nanotubes. Bearing ring according to one of claims 1 to 6, characterized in that the bearing ring ( 2 . 3 ) is provided for a slewing bearing, in particular that the bearing ring ( 2 . 3 ) has a diameter of more than about 1000 millimeters. Bearing ring according to one of claims 1 to 7, characterized in that the carrier and the body friction or frictionally, especially by means of the career Shrink, attached to each other. Bearing ring according to one of claims 1 to 8, characterized in that the body of the track ( 2 . 3 ) is formed as a circular ring, wherein along the circumference of the circular ring a continuous contact surface ( 8th . 10 ) to the carrier ( 7 . 9 ), in particular such that between the carrier ( 7 . 9 ) and the corpus of the career ( 5 . 6 ) no cavity is formed. Bearing ring according to one of claims 1 to 9, characterized in that the material of the track ( 5 . 6 ) comprises an embroidered, martensitic cold work steel, in particular a martensitic hardenable nitrogen-alloyed steel, each with at least 0.2% carbon and nitrogen and at least 13% chromium, or a high-speed steel, in particular a high-speed steel produced by powder metallurgy. Bearing ring comprising a raceway ( 5 . 6 ) comprising a body of an embossed martensitic cold work steel, in particular of a martensitic hardenable nitrogen-alloyed steel each having at least 0.2% carbon and nitrogen and at least 13% chromium, or a high-speed steel, in particular a high-speed steel produced by powder metallurgy, a support ( 7 . 9 ) of a tempered steel, case-hardening steel or austenitic steel, the body of the track ( 5 . 6 ) on the carrier ( 7 . 9 ) is attached. Rolling bearing comprising a bearing ring ( 2 . 3 ) according to one of claims 1 to 11. Rolling bearing according to claim 12, characterized in that both bearing rings ( 2 . 3 ) are formed according to one of claims 1 to 8, and that the carrier ( 7 . 9 ) of both bearing rings ( 2 . 3 ) consist of the same material. Rolling bearing according to one of claims 12 or 13, further comprising rolling elements ( 4 ) made of a ceramic material.

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