DE102007061280A1 - Axial ball roller bearing e.g. radial roller bearing, for use in motor vehicle, has ball rollers including side surfaces formed as ball surface segments, where radius of curvatures of ball surface segments are larger than base ball radius - Google Patents

Abstract

The bearing (1) has a set of ball rollers (9) arranged between an outer bearing ring (3) and inner bearing ring (5). The ball rollers are maintained by a roller bearing (7) in predetermined distance. A career bracket is terminated to a rim (25) that is guided by a rolling motion of the ball rollers. The rollers include a base ball radius and side surfaces (39, 41) located opposite to each other. The side surfaces are formed as a set of ball surface segments (43, 45), where the radius of the curvatures of the ball surface segments are larger than the base ball radius.

Description

Field of the invention

The The invention relates to an axial ball roller bearing with an outer Bearing ring, an inner bearing ring and a plurality of ball rollers, which are arranged between these two bearing rings, by a Bearing cage at predetermined intervals from each other be held and in groove-shaped raceways of the bearing rings unroll, with at least one career by at least one Unrolling the ball rollers is limited to leading board, and wherein the ball rollers have a basic ball radius and two opposite one another Have side surfaces.

Background of the invention

Formed as a radial roller ball roller bearings are for example from the German patents DE 10 2005 061 792 A1 . DE 10 2006 019 230 A1 and DE 10 2006 019 228 A1 known. They serve for the storage of movable mechanical components, such as a fixed bearing for shafts in shift or steering gears of motor vehicles. In addition, from the unpublished patent applications DE 10 2006 057 487.7 and DE 10 2006 060 678.7 the same applicant a support bearing for a dual clutch drives and a bearing assembly for a shaft known in which in single-row or multi-row arrangement ball rollers are used as rolling elements. These axial angular contact roller bearings have obliquely arranged ball rollers, which can also absorb axial forces in addition to radial forces. The ball rollers each have two opposite planar side surfaces which are supported in some embodiments on shoulders or rims of the inner rings or outer rings of these bearings or on adjacent flat side surfaces of ball rollers.

at such generically designed axial ball roller bearings arises the technical problem that occurs during the Rolling the ball rollers occurring contact between the flat side surfaces of the ball rollers and the plan Surfaces of the shelves a comparatively large Contact surface is effective. This leads to a relatively fast wear of the side surfaces of the ball rollers as well as the shelf on the bearing rings and thus to a comparatively rapid wear of such an axial ball roller bearing.

Object of the invention

outgoing from the stated disadvantages of the solutions of the known The prior art is therefore the object of the invention, a Present axial ball roller bearing of the type mentioned, at the side surfaces of the ball rollers as well as the Wear less ribs, so that the wear of the axial ball roller bearing is slowed down.

Description of the invention

starting point The invention is an axial ball roller bearing with an outer Bearing ring, an inner bearing ring and a plurality of ball rollers, which are arranged between these two bearing rings, by a Bearing cage at predetermined intervals from each other be held and in groove-shaped raceways of the bearing rings unroll, with at least one career by at least one Unwinding of the ball rollers leading edge is limited, and wherein the ball rollers have a basic ball radius and two opposite one another Have side surfaces. The axial ball roller bearing draws According to the invention characterized in that the side surfaces are formed as spherical surface segments whose radii of curvature each greater than the basic ball radius.

According to the Invention are therefore known instead of the known from the prior art, formed as planes side surfaces of the ball rollers such side surfaces acting as spherical surface segments are formed. These side surfaces are therefore after arched on the outside or, as the saying goes, ball-point. The radii of curvature of the curvature of the lateral surfaces are here larger than the basic radius of the ball Ball roller, which is why the spherical surface segments of the sides the ball rollers are formed comparatively flat. This is sufficient that the contact surface, the during the rolling of the ball rollers in an optionally occurring contact between the edges of the bearing rings and the side surfaces of the ball rolls arises when fishing Borden not planar but punctiform or is formed linear. This is the contact surface in the ball rollers of the rolling bearing according to the invention much smaller than in the prior art. Thus, the use of the Surfaces of the shelves as well as the side surfaces the ball rolls less, which also reduces wear of the Axialkugelrollenlagers leads.

In their most general embodiment, the side surfaces the ball roller ball surface segments on whose radii of curvature are different. The side surfaces of the ball roller are In this embodiment, therefore, different degrees of frontal ball. The Ball roll is so with respect to their main extension plane not mirror-symmetrical.

In a preferred embodiment of the invention, the radii of curvature of the two However, spherical surface segments are the same. In this embodiment, the ball roller is mirror-symmetrical with respect to its main extension plane. This simplifies the production of such a ball roller and thus reduces their production costs.

One Axial ball roller bearings existing problem concerns their installation in a given environment construction, such as in a Steering or manual transmission of a motor vehicle. To the installation as possible Being able to simply design is at a preferred Embodiment of the invention provided that the Bearing cage and the inner bearing ring, each with at least a connecting element are provided, through which the bearing cage and the inner bearing ring are connected to each other. For the case that the axial ball roller bearing as on a housing used to be mounted bearing for a shaft should be, the installation of the axial ball roller bearing forming Items, namely the inner bearing ring, the bearing cage and the outer bearing ring, into a given surrounding structure done so that the first of the ball rollers containing Bearing cage by means of the connecting elements with the inner bearing ring is connected, and the two then interconnected items then be attached to the shaft. The outer one Bearing ring is then placed on the bearing cage fitted and connected to the housing with a snug fit.

at a particularly preferred embodiment of the invention is provided that the connecting element of the bearing cage as having a radially inwardly facing step Extension and the connecting element of the inner bearing ring as itself from the outer circumference of the inner bearing ring are formed radially outwardly extending projection. Establishing a connection between the bearing cage and the bearing ring takes place in this embodiment by pushing of the ball cages containing bearing cage over the inner bearing ring. Passed by the axial Aufschiebevorgang the radially inwardly facing step of the extension behind the radially outwardly facing projection of the inner bearing ring. The connection comes through a positive connection between the projection and the extension in the sense. Since the preparation of the compound only by axial sliding of the bearing cage on the inner bearing ring takes place and also no further aids to Making the connection needed will do this Embodiment of the connecting means the preparation of this compound especially easy.

In the choice of geometric parameters for the ball roller subject to the inventive design of the axial ball roller bearing no further restrictions than is the case with the embodiments of the prior art. In a preferred embodiment of the invention it is therefore provided that the basic ball radius r and the width b of the ball roller are selected such that sin α ₀ <b / 2r, where α _{0 is} the contact angle of the axial ball roller bearing. It is thus possible to optimally adjust the basic ball radius r and the width b of the ball roller to the desired contact angle α ₀ required in the application.

One Axial ball roller bearing according to the invention can be everywhere used there advantageous where axial spherical roller bearings and Axial angular contact ball bearings are used. It has one high load capacity, is axial compared to angular contact ball bearings very short and can be produced inexpensively. Of course Such an axial angular contact ball bearing can also as Tandem bearing with several rows of rolling elements same or other design.

Brief description of the drawings

A preferred embodiment of the invention formed Axialkugelrollenlagers is below with reference to the attached drawings explained in more detail. Showing:

1 a partial axial section through an inventively designed axial ball roller bearing, and

2 a ball roller in a schematic cross-sectional view.

Detailed description the drawings

As in 1 is shown comprises an axial ball roller bearing 1 a radially outer bearing ring 3 and a radially inner bearing ring 5 , Between the outer bearing ring 3 and the inner bearing ring 5 is a camp cage 7 arranged, which has a plurality of ball rollers 9 absorbs such that these between the outer bearing ring 3 and the inner bearing ring 5 are held at predetermined distances from each other.

The inner bearing ring 5 can with its inner surface 11 For example, be pressed onto a shaft while the outer bearing ring 3 with its outer circumferential surface 15 for example, in a housing, not shown fastened. In the outer bearing ring 3 is a career 19 and in the inner bearing ring 5 a career 21 incorporated, each having the shape of a groove. In the two careers 19 and 21 rolls the ball roller 9 with her tread 23 from.

The axial ball roller bearing 1 is designed as axial angular contact roller bearings. At this Design are the outer bearing ring 3 and the inner bearing ring 5 both offset in the axial and in the radial direction against each other is arranged; So they are at an angle to each other. This configuration allows the axial ball roller bearing 1 can absorb both axial and radial loads.

The inner bearing ring 5 is also with a board 25 provided that the career 21 of the inner bearing ring 5 limited and as one-sided leadership in the rolling motion of the ball roller 9 serves for the same. The board 25 and the career 21 of the inner bearing ring 5 go to a lubricant supply port 27 into each other. About the lubricant supply port 27 gets to the ball rollers 9 introduced a lubricant, which is due to the rolling movement of the ball rollers 9 in the groove-shaped raceways 19 and 21 as well as on the tread 23 the ball rollers 9 distributed. The lubricant serves to lubricate the axial ball roller bearing 1 ,

The inner bearing ring 5 also has its outer circumference 29 a radially outwardly extending projection 31 on. In addition, the bearing cage 7 at its radially outer end 33 an extension 35 on, with a radially inward-facing step 37 is provided. The lead 31 and the extension 35 serve as connecting elements for mutual connection of the inner bearing ring 5 and the camp cage 7 , In 1 are the inner bearing ring 5 and the camp cage 7 shown in the mutually connected state in which the stage 37 of the extension 35 behind the projection 31 is located, so that by means of a positive connection, a connection between the inner bearing ring 5 and the storage cage 7 is made.

The installation of the axial ball roller bearing 1 forming items in a given surrounding construction can be made such that the first of the ball rollers 9 containing bearing cage 7 by sliding the bearing cage 7 on the inner bearing ring 5 is connected to this and the two interconnected items are then attached to said shaft, not shown. The outer bearing ring 3 is then on the rolling stock-equipped bearing cage 7 mounted and connected to the housing.

In 2 is the ball roller 9 from 1 shown in isolation. The sectional view makes it clear that the ball roller 9 from the tread 23 as well as from a first side surface 39 and a second side surface 41 is limited. The side surfaces 39 and 41 are arranged opposite each other.

The basic ball radius r of the ball roller 9 represents the radius of curvature of the tread 23 dar. The curvature of the first side surface 39 is, however, defined by a first radius of curvature R ₁ , while the curvature of the second side surface 41 is determined by a second radius of curvature R ₂ . Due to this configuration, the first side surface 39 and the second side surface 41 as the first spherical surface segment 43 or second spherical surface segment 45 educated. The side surfaces 39 and 41 the ball roller 9 are, as they say, bullseye trained.

At the in 2 illustrated embodiment of the ball roller 9 are the two radii of curvature R ₁ and R ₂ different, which is why the two spherical surface segments 43 and 45 are different. The ball roller 9 is therefore with respect to a main extension plane 47 the ball roller is not mirror-symmetrical, whereas they are with respect to a perpendicular to the main plane of extension 47 extending sub-extension plane 49 is mirror-symmetrically shaped. The radii of curvature R ₁ and R _{2 of} the ball roller 9 are determined depending on the particular application. So it may be, for example, that the opposite face of the board 25 not flat or plan, but also slightly curved outward. The respective radii of curvature are therefore preferably determined as a function of the geometries of the opposing surfaces, wherein the side surfaces 39 . 41 the ball rollers 9 However, always arched outwards are formed. The aim of this design is always a wear reduction of the friction partner bearing ring and ball roller.

The height d of the ball roller 9 corresponds to the diameter of the basic sphere and thus to the double basic sphere radius r, that is, d = 2r. The ball roller 9 also has a width b.

The characteristic size for the ability of the ball roller 9 of the axial ball roller bearing 1 To absorb and dissipate external loads is known to be the contact angle α ₀ . 2 makes it clear that, depending on the applied load, the height d of the ball roller 9 and whose width b can be chosen such that sinα ₀ <b / 2r. The height d and the width b may vary depending on the use of the axial ball roller bearing 1 are chosen freely while maintaining the above inequality, so that a load absorbed by the shaft via the inner bearing ring 5 , the ball rolling 9 and the outer bearing ring 3 of the axial ball roller bearing 1 optimally transferred to the housing.

A common consideration of the 1 and 2 makes it clear that by training the second side surface 41 as a spherical surface segment 45 the contact area between the board 25 of the inner bearing ring 5 and the second side surface 41 at one during the rolling of the ball roller 9 possibly occurring contact between the ball roller 9 and the board 25 is relatively small. Therefore, use the board 25 and the second side surface 41 less, which leads to a comparatively low wear of the axial ball roller bearing 1 leads.

This in 1 illustrated embodiment of the axial ball roller bearing 1 has only one board. In other, not shown embodiments of the invention, the raceway of the inner bearing ring is bounded on both sides by Borden, so that on both sides a guide of the rolling movement of the ball roller can be done. Of course, one or more shelves can also be attached to the outer bearing ring 3 be formed when the axial forces acting on the axial angular contact roller bearings and / or the construction of the component to be stored make this necessary. The invention advantageous effect of less wear of a Bordes a bearing ring and a side surface of a ball roller is then given for both shelves and both side surfaces.

1

axial ball bearing

3

Outer bearing ring

5

inner bearing ring

7

bearing cage

9

ball roller

11

Inner surface area of the inner bearing ring

15

Outer casing surface of the outer bearing ring

19

career of the outer bearing ring

21

career of the inner bearing ring

23

tread the ball roller

25

shelf of the inner bearing ring

27

lubricant supply

29

Outer Circumference of the inner bearing ring

31

head Start of the inner bearing ring

33

Radially outside End of the bearing cage

35

extension of the bearing cage

37

step of the bearing cage

39

First Side surface of the ball roller

41

Second Side surface of the ball roller

43

first Spherical surface segment

45

second Spherical surface segment

47

Main plane the ball roller

49

In addition to the extension plane the ball roller

α ₀

contact angle

b

width the ball roller

r

Ground ball radius

d

height the ball roller

R ₁

first radius of curvature

R ₂

second radius of curvature

T

pitch circle

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 102005061792 A1 [0002]
• - DE 102006019230 A [0002]
• - DE 102006019228 A1 [0002]
• - DE 102006057487 [0002]
• - DE 102006060678 [0002]

Claims (5)

Axial ball roller bearings ( 1 ) with an outer bearing ring ( 3 ), an inner bearing ring ( 5 ) and a plurality of ball rollers ( 9 ) between these two bearing rings ( 3 . 5 ) are arranged by a bearing cage ( 7 ) are held at predetermined distances from each other and in grooved tracks ( 19 . 21 ) of the bearing rings ( 3 . 5 ), wherein at least one track by at least one of the rolling of the ball rollers ( 9 ) leading board ( 25 ) and the ball rollers ( 9 ) a Grundkugelradius (r) and two opposing side surfaces ( 39 . 41 ), characterized in that the side surfaces ( 39 . 41 ) as spherical surface segments ( 43 . 45 ) are formed whose radii of curvature (R ₁ , R ₂ ) are each greater than the basic sphere radius (r). Axial ball roller bearing according to claim 1, characterized in that the radii of curvature (R ₁ , R ₂ ) of the two spherical surface segments ( 43 . 45 ) are the same. Axial ball roller bearing according to claim 1 or 2, characterized in that the bearing cage ( 7 ) and the inner bearing ring ( 5 ) are each provided with at least one connecting element, through which the bearing cage ( 7 ) and the inner bearing ring ( 5 ) are connectable to each other. Axial ball roller bearing according to one of claims 1 to 3, characterized in that the connecting element of the bearing cage ( 7 ) as having a radially inwardly facing step ( 37 ) provided extension ( 35 ) and the connecting element of the inner bearing ring ( 5 ) as one from the outer periphery ( 29 ) of the inner bearing ring ( 5 ) from radially outwardly extending projection ( 31 ) are formed. Axial ball roller bearing according to one of claims 1 to 4, characterized in that the basic ball radius (r) and the width (b) of the ball roller ( 9 ) are selected such that sin α ₀ <b / 2r, where α _{0 is} the contact angle of the axial ball roller bearing ( 1 ).