DE102008004924A1 - Collar for frontal teeth for a drivable hub - Google Patents

Abstract

The invention relates to a collar of a hub of a wheel bearing, with which at least one inner ring of a roller bearing of the wheel bearing is held axially on the hub and formed in the frontal teeth for engagement in a counter-toothing, a method for producing such a federal government and an undeformed hub a wheel bearing with a hollow end piece for deformation to such a collar. The collar is formed from an integrally formed with the hub tail, which has in its initial state before forming the collar in the axial direction and axially beyond the edge of the inner ring protrudes, with respect to a Wälzkörpermittelpunktes the rolling elements of the rolling element of the bearing (axial) Projection L trains. The ratio (inner) diameter D of the inner ring to supernatant L is greater than about 1.25 and less than about 3, d. H. 1.25 <D / L <3.

Description

Field of the invention

The The invention relates to a collar made of cold plastically deformed material a hub of a wheel bearing, with the at least one inner ring of a Rolling of the wheel bearing on the hub held axially fixed is and in the frontal teeth for the procedure formed in a counter-toothing, and a method for producing of such a covenant.

Farther The invention relates to an undeformed hub of a wheel bearing with a hollow end piece for deformation to such a collar.

Background of the invention

With such a collar or with such a hub is concerned DE 3636243 A1 ,

through the federal government is the wheel bearing unit, usually an angular contact ball bearing or oblique roller assembly, backlash biased in itself held.

The finished waistband 3 to 1 will, as in 2a and 3 is shown, one-piece with a hub 1 trained hollow tail 2 shaped. When forming the covenant 3 becomes the material of the tail 2 plastically via a - radially inward and axially outward - edge 4 an inner ring 5 an angular contact ball bearing radially outwardly folded.

If the covenant 3 as well as in 2 B shown, a spur toothing 6 with teeth 7 for engaging in a non-illustrated counter teeth, the teeth 7 either when turning over the tail 2 to the covenant 3 with molded or teeth 7 be with a separate process step in the finished covenant 3 brought in. The counter-toothing is formed for example on a bell of a propeller shaft.

The Bund 3 gets out of the tail with a tool 2 shaped. For this purpose, the initially substantially hollow-cylindrical end piece 2 , as in 3 represented, radially widened funnel-shaped and in the end position to 2 B to the covenant 3 shaped.

The problem is the shaping of the teeth 7 , The material of the part 8th of the tail 2 tapers when expanding and flipping and flows radially outward. The particular tooth 7 is not fully formed due to the uncontrollable flow away the material to the outside and the bearing portion, which is determined in particular by the dimension B, is low. B is a distance between the points S and T. The unfilled portion C and A - (B + C) is measured on the total proportion of the tooth 7 low over the length A

A portion of the material may evade uncontrolled inward, so that between the inner ring 5 and the hub 1 an annular gap 31 forms, which adversely affects the tightness of the inner ring 5 effect.

This problem tried the professional world, as in DE 36 36 243 A1 shown to prevent by a tool that prevents the collar radially outward on the path. The process is, however, due to tolerances in the dimensions of the blank, such as wall thickness and diameter of the tail, usually difficult to implement in the required quality.

at the mounting of a drive element, for example a joint part, in the wheel hub assembly center the drive element and the Wheel hub with respect to the axis of rotation due to the geometry the interlocking with each other. A high concentricity at the Connection while driving is thus secured. The assembly of the joint part to the hub is on the one hand due to the self-centering simple, on the other hand, however, requires a very high axial preload force.

The Flanks of all teeth of the spur toothing stand with both Flanks of all teeth of the counter toothing in the rotationally fixed engagement. The teeth are axial by means of one or more screw elements braced. Torques are determined by the surface pressure generated force - transferred form fit to the wheel hub.

The Connection of the joint part with a hub is in particular then advantageous when high torque from the drive to the wheel or u. U. also in reversed torque flow to be transmitted.

Often are the commonly used pairings of indoor and external teeth space-technical and thus terms the strength is exhausted, so that the spur toothing, as described, a safe and space-saving alternative to these is.

The rigid design for the transmission of high torques To the wheel can then adversely affect, if in case of overload a breakage of the wheel hub in the worst case to the loss of the vehicle wheel leads.

Summary of the invention

The object of the invention is therefore, ei to create a covenant, the design of which avoids the aforementioned disadvantages.

These Task is by the federation of plastically deformed material a Hub of a wheel bearing, by the method for producing such Federal as well as by an undeformed hub of a wheel bearing with a hollow tail to deform to such a covenant with the features according to the respective independent claim solved.

Of the Bunch is made of plastically deformed material of a hollow tail a hub of a wheel bearing is formed or made of a plastic formed material to be deformed hollow end piece.

The Material of the hollow tail is or is preferably cold through the so-called rolling riveting, a process off Expansion, bending and embossing, radially outward over a radially inner and axially outer edge of a Inner ring of a rolling bearing of the wheel bearing, which rolling bearings at least the inner ring and rolling elements of a Rolling element series, shaped.

The integral with the hub formed tail has in its initial state before forming the federal in axial Direction and is axially over the edge of the inner ring in addition, with respect to a Wälzkörpermittelpunktes the rolling elements of the rolling element row of the rolling bearing an (axial) protrusion L forms.

It it has been shown that the disadvantages discussed above are particular then overcome, if the invention Ratio (inside) diameter D of the inner ring to overhang L greater than about 1.25 and smaller than about 3, d. H. 1.25 <D / L <3.

The End piece is not substantially hollow cylindrical according to the invention formed, but has at the supernatant L, in particular in an area where it is in its initial state before molding the collar is axially beyond the edge of the inner ring, an accumulation of the material in the form of a radial thickening on.

by virtue of the rotational symmetry of the tail is that about the axis of rotation circumferential material accumulation usually one in the circumferential direction closed or interrupted bulbous thickening.

By the accumulation of material at the tail is at Forms of toothing enough material to fill the cavities for the teeth in the mold available. The tooth is filled significantly better in its contour and the supporting share is thus significantly increased. separate Measures to limit the radial flow of material are unnecessary.

The Design of the individual tooth may be due to the shape and cross section the thickening or the accumulation of material influenced and be optimized.

Thickening designs / geometries

The Thickening is arbitrarily designed and can be used in both radial directions, so radially outward away from the axis of rotation and / or radially inward towards the axis of rotation, projecting. Preferably the thickening is radially inward before forming the collar in the direction of the axis of rotation of the hub from the tail out.

A preferred embodiment of the invention provides that the thickening at a free and in the axial direction facing end of the tail is trained.

So can be provided that the outer contour of the thickening before forming the collar to the front of the tail towards the axis of rotation drops. The same can be provided for the inner contour.

Prefers can the drop of the outer contour by a predetermined angle α, in particular by an angle α from a range [5 °, 60 °], be inclined to the axis of rotation; the drop in the inner contour may also be preferred by a predeterminable angle β, in particular by an angle β from a range [2 °, 40 °], be inclined relative to the axis of rotation.

Farther provision may be made for the, in particular inclined, external and / or the, in particular inclined, inner contour before molding Rounded the Federal or over straight into one another.

in the Case of a rounded transition, this round transition be formed by a radius of curvature R. alternative it is also possible that the rounded transition through several rounded transition areas with several, different radii of curvature Ri is formed.

Also can be provided that an inner contour of the thickening in front of the Forms of the federal government to a free and pointing in the axial direction End of the tail increases away from the axis of rotation away.

Preferably, the increase of the inner contour by a predetermined angle μ, in particular by ei NEN angle μ from a range [10 °, 40 °], be inclined relative to the axis of rotation.

ratio geometries

Further According to one embodiment, the collar can be designed in such a way that that a ratio of rolling element diameter Dm the rolling elements of the rolling bearing of Wheel bearing unit to the supernatant L larger chosen to be about 1.25 and less than about 3 is.

Also The federal government may be designed such that a ratio supernatant L to smallest end piece cross-section Qmin before molding Federal greater than about 3 and is less than about 7.

Prefers can also be provided that at the federal government a ratio Rolling element diameter Dm of the rolling elements to smallest end piece cross-section Qmin before forming the Federal greater than about 1.25 and less is realized as about 4.

at In another embodiment, the collar is designed such that a ratio of smallest end piece cross section Qmin before forming the collar to the largest tail section Qmax before forming the coven greater than approximately 0.5 and less than about 0.95 is selected.

Especially Preferably, the collar is designed such that the supernatant L is greater than about 17.5 mm.

at another preferred embodiment, the federal government is designed in such a way that a head width KB of the covenant with the frontal teeth greater than about 5 mm.

Also can be provided that at the federal government a ratio supernatant L to head width KB of the collar with the frontal teeth greater than about 2 and less than about 6 is selected.

Further The federation can be formed in such a way that a relationship Head width KB of the collar with the frontal teeth too Gearing depth ZT of the frontal teeth larger as about 1.6 and less than about 3.5 is.

at The process of making the covenant is the material of the hollow End of the hub cold radially outward over the radially inner and axially outer edge of the inner ring, in particular by a Wälznieten, folded and shaped.

Farther can then put teeth in the collar at the front the engagement in a counter-toothing be formed.

The Dimensions and dimensions of serrations are limited to wheel bearings for reasons of space limitations. The pitch circle diameter (mean circumference of the spur toothing to the axis of rotation) of the gearing is therefore usually within very tight limits. Thus, the behavior of the gearing, For example, hardly against loads from the drive torques or not by changes in the pitch circle of the teeth to be influenced.

With However, the invention can the geometry of the individual teeth the teeth on the flank angle so influenced that with regard to assembly and with regard to the loads from torques optimal number of teeth set to a predetermined extent can be.

Description of the drawings

The 1 to 12 show longitudinal sections or details of longitudinal sections along the axis of rotation 1a a wheel bearing assembly 9 in various modifications of embodiments of the invention.

The 1 . 3 . 5 show a wheel bearing assembly 9 with a hub 1 , two rows of rolling elements 10 and a vehicle flange 11 , The hub 1 has a flange 12 for mounting a vehicle wheel, not shown, and is on the rolling elements 10 around the axis of rotation 1a rotatable to the vehicle-fixed vehicle flange 11 stored. On the hub 1 sits an inner ring 5 , whose inner ring diameter is denoted by D and on which a number of rolling elements 10 expires.

In the representations after the 4 The following is one piece with the hub 1 connected tail 14 respectively. 15 shown in the starting position before Wälznieten.

The inner ring 5 is - after the Wälznieten -, as in an enlarged detail 4b represented by means of one of the tail 14 emerged federal 16 axially on the hub 1 held. This is the hollow tail 14 radially outward over an edge 4 of the inner ring 5 shaped. In addition, the angular contact ball bearing assembly by means of the federal government 16 biased. In the covenant 16 is a spur toothing 13 educated.

The hollow tails 14 respectively. 15 exhibit before forming the covenant 16 in the initial state in the axial direction and stand axially over the edge 4 of the inner ring 5 In addition, with respect to the Wälzkörpermittelpunktes M of the rolling elements 10 the collar side Wälzkörperreihe an (axial) supernatant L 8th formed.

Execution is the ratio of inner ring diameter D to supernatant L greater than about 1.25 and smaller as about 3, d. H. 1.25 <D / L <3.

The tails 14 respectively. 15 show how further the 4a and 5 successive show at least on the supernatant L 8th , in particular on the part where it is axially over the edge 4 addition, an accumulation of the material in the form of a radial thickening 18 . 19 or 20 on.

Design geometry

Various embodiments of geometric relationships on the wheel bearing assembly according to the invention 9 are below in particular including the 4a and b or their dimensioning.

After dimensioning according to 4a can the covenant 16 before deformation or the tail 14 be formed such that a ratio rolling element diameter Dm of the rolling elements 10 to the supernatant L 8th greater than about 1.25 and less than about 3 is selected.

Next can after 4a also the tail 14 may be formed such that a ratio of protrusion L to smallest end piece cross-section Qmin before forming the collar is greater than about 3 and less than about 7.

Moreover, as well 4a it can be seen in the section 14 a ratio of rolling element diameter Dm of the rolling elements 10 to the smallest end piece cross-section Qmin before forming the waistband be greater than about 1.25 and less than about 4 realized.

Furthermore, after 4a the section 14 such that a ratio of smallest end piece cross-section Qmin before forming the collar to largest end piece cross-section Qmax before forming the collar is chosen to be greater than about 0.5 and less than about 0.95.

Further shows 4a a supernatant L 8th , which is greater than about 17.5 mm.

To 4b is the covenant 16 designed after processing such that a head width KB of the collar with the frontal teeth is greater than about 5 mm.

Next can like 4b clarified provided that at the federal 16 a ratio supernatant L to head width KB of the covenant with the frontal teeth greater than about 2 and less than about 6 is selected.

Further, after 4b the Bund 16 be formed such that a ratio head width KB of the collar with the front teeth to toothing depth ZT of the front teeth is greater than about 1.6 and less than about 3.5.

Design thickening 18 . 19 . 20

Embodiments of thickening 18 . 19 or 20 are in the 4a and 5 to 12 shown. With such designs, the flow and distribution of the material during forming is optimized.

In the 4a and 5 shown thickening 18 respectively. 19 is radially in the direction of the axis of rotation 1a and is - regardless of slight edge rounding - at the free end pointing in the axial direction 32 of the tail 14 respectively. 15 thickest.

When forming the spur toothing 13 is such a material accumulation in particular in the area C (see. 4b respectively. 2 B ) effectively, so that less material flows outward and so in area B (see. 4b respectively. 2 B ) for filling the cavities of the teeth 7 is available.

In the 6 illustrated rotationally symmetric thickening 18 on the tail 15 has centrally the largest radial dimension X and is radially in the direction of the axis of rotation 1a and radially outward from the tail 15 out. When axial shaping of the covenant 16 and the spur toothing 13 the material is distributed in both radial directions.

The in the 7 to 12 shown thickening 20 each stand radially in the direction of the axis of rotation 1a out. Both 7 to 11 , in particular clarified in the 7 . 8th and 10 , the outer contour falls in each case 29 the thickening 20 to the front side 32 of the tail 15 towards the axis of rotation 1a at the angle α and the inner contour 33 the thickening 20 to the front side 32 of the tail 17 towards the axis of rotation 1a at the angle β.

The Inner contour is in particular by an angle β from a Range [2 °, 40 °], opposite to the axis of rotation inclined.

Furthermore, like that 7 to 12 to provide that the, in particular inclined, outside and / or, in particular inclined, inner contour before forming the collar rounded or straight-sided into each other.

In the case of a rounded transition this round transition is formed by a radius of curvature R. Alternatively possible is like 11 shows, in that the rounded transition is formed by a plurality of rounded transition regions having a plurality of different radii of curvature Ri.

8th shows an embodiment in which the inner contour of the thickening 20 before forming the covenant to a free end pointing in the axial direction 32 of the tail 15 rises away from the axis of rotation away.

Of the Increase of the inner contour is thereby by a vorgebaren angle μ, especially from a range [10 °, 40 °], opposite the axis of rotation inclined.

1

hub

1a

axis of rotation

2

tail

3

Federation

4

edge

5

inner ring

6

spur gearing

7

tooth

8th

Got over L

9

The wheel bearing assembly

10

rolling elements

11

vehicle flange

12

flange

13

spur gearing

14

tail

15

tail

16

Federation

17

tail

18

thickening

19

thickening

20

thickening

21

geometric line

22

geometric line

23

geometric line

24

route

25

addendum

26

inlet contour

27

tooth root

28

discharge contour

29

outer contour

30

flank

31

annular gap

32

free axial end, front side

33

inner contour

D

Inner ring diameter

α

Inclination angle, waste outer contour 29

μ

Inclination angle, increase inside contour 33

R

radius

β

Inclination angle, waste inner contour 33

M

Wälzkörpermittelpunkt

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 3636243 A1 [0003, 0010]

Claims (15)

Federation ( 16 ) of plastically deformed material of a hub ( 1 ) a wheel bearing unit, with which at least one inner ring ( 5 ) of a rolling bearing of the wheel bearing unit on the hub ( 1 ) is held axially fixed and in the front side teeth ( 7 ) are formed for engagement in a counter-toothing, which roller bearing comprises at least the inner ring and rolling elements of a row of rolling elements, wherein: - the collar ( 16 ) is formed from a radially outwardly via a radially inner and axially outer edge ( 4 ) of the inner ring ( 5 ) shaped hollow tail ( 14 ) at the hub ( 1 ), - the tail ( 14 ) is integral with the hub ( 1 ), - the tail ( 14 ) has in its initial state before forming the collar in the axial direction and is axially beyond the edge of the inner ring out, with respect to a Wälzkörpermittelpunktes the rolling elements of the rolling element of the rolling bearing an (axial) protrusion L forms - a ratio of inner diameter D of the inner ring ( 5 ) to supernatant L is greater than about 1.25 and less than about 3, - the tail ( 14 ) points in an area where it is in its initial state before forming the Federal ( 16 ) axially over the edge ( 4 ) is an accumulation of the material in the form of a radial thickening ( 18 ) on. Federation ( 16 ) according to one of the preceding claims, in which a ratio Wälzkörperdurchmber Dm of the rolling elements of the rolling bearing, in particular of balls of an angular contact ball bearing, the wheel bearing unit to the supernatant L is greater than about 1.25 and less than about 3 is selected. Federation ( 16 ) according to any one of the preceding claims, wherein a ratio of protrusion L to smallest end piece cross-section Qmin before forming the collar is greater than about 3 and less than about 7. Federation ( 16 ) according to one of the preceding claims, in which a ratio Wälzkörperdurchmber Dm of the rolling elements to smallest end piece cross-section Qmin is realized before forming the Federal greater than about 1.25 and less than about 4. Federation ( 16 ) according to any one of the preceding claims, wherein a ratio of smallest end piece cross-section Qmin before forming the collar to largest end piece cross-section Qmax before forming the collar is chosen to be greater than about 0.5 and less than about 0.95. Federation ( 16 ) according to any one of the preceding claims, wherein the supernatant L is greater than about 17.5 mm. Federation ( 16 ) according to one of the preceding claims, in which a head width KB of the collar with the frontal teeth is greater than approximately 5 mm. Federation ( 16 ) according to any one of the preceding claims, wherein a ratio protrusion L to head width KB of the collar with the frontal teeth is greater than about 2 and less than about 6 is selected. Federation ( 16 ) according to one of the preceding claims, in which a ratio head width KB of the collar with the frontal teeth to toothing depth ZT of the frontal teeth is greater than about 1.6 and less than about 3.5. Federation ( 16 ) according to one of the preceding claims, in which the thickening ( 18 ) before forming the Federal ( 16 ) radially inwardly and / or outwardly with respect to the axis of rotation ( 1a ) the hub ( 1 ) from the tail ( 14 ) and around the axis of rotation ( 1a ) runs. Federation ( 16 ) according to one of the preceding claims, in which the thickening ( 18 ) before forming the Federal ( 16 ) in an area near or at a free end pointing in the axial direction ( 32 ) of the tail ( 14 ) is formed and about the axis of rotation ( 1a ) runs. Method of making a federal ( 16 ) according to one of the preceding claims, in which the material of the hollow end piece ( 14 ) the hub ( 1 ) cold radially outward over the radially inner and axially outer edge ( 4 ) of the inner ring ( 5 ), in particular by rolling riveting, folded over and shaped. Method according to the preceding claim, in which 16 ) front teeth ( 7 ) are formed for engagement in a counter-toothing. Hub ( 1 ) of a wheel bearing with a hollow end piece for deformation into a collar according to one of the preceding claims, wherein: - the end piece ( 14 ) is integral with the hub ( 1 ), - the tail ( 14 ) has in its initial state before forming the collar in the axial direction and is axially beyond the edge of the inner ring out, with respect to a Wälzkörpermittelpunktes the rolling elements of the rolling element of the rolling bearing an (axial) protrusion L forms, - a ratio inner diameter D of the inner ring ( 5 ) to supernatant L is greater than about 1.25 and less than about 3, - the tail ( 14 ) points in an area where it is in its initial state before forming the Federal ( 16 ) axially over the edge ( 4 ) is an accumulation of the material in the form of a radial thickening ( 18 ) on. Hub according to the preceding claim, with the federal government according to any one of the preceding claims.