Method for obtaining face teeth on an inner ring of a wheel hub and associated tool

Patent metadata

Field	Value
Publication number	US-2022241844-A1
Application number	US-202217586843-A
Country	US
Kind code	A1
Filing date	Jan 28, 2022
Priority date	Feb 3, 2021
Publication date	Aug 4, 2022
Grant date	—

Abstract

A method and tool for obtaining face teeth having a plurality of radial teeth on an annular collar of an inner ring of a wheel hub; in which annular roughed-out face teeth are first formed on the collar coaxial with an axis of symmetry (A) of the collar and having a plurality of radial first teeth arranged in a crown and alternating at constant pitch with a plurality of radial first concavities; then a shaping tool comprising a pressing head provided with annular calibration face teeth is axially pressed onto the collar to engage with the annular roughed-out face teeth, second radial concavities of the annular calibration teeth each being delimited by a bottom wall having a rounded circumferential profile exactly reproducing in negative the rounded circumferential profile of the tips or ridges of the radial teeth of the required face teeth.

First claim

We claim:

1 . A method for obtaining a finished face teeth on an inner ring of a wheel hub, the finished face teeth comprising a plurality of finished radially extending teeth having ridges defining a first rounded circumferential profile and a plurality of concavities, the plurality of finished radially extending teeth alternating with the plurality of finished concavities, the inner ring being initially provided with an annular collar at a first extremity of the inner ring, the annular collar having a predetermined radial profile, the method comprising:
forming, on the annular collar by cold plastic deformation, an annular roughed-out face teeth, the annular rouged-out face teeth formed coaxial with an axis of symmetry (A) of the annular collar, wherein axis A coincides with an axis of symmetry (B) of the wheel hub and comprising a plurality of first radially extending teeth having ridges and arranged annularly, and a plurality of first radial concavities alternating annularly with the plurality of first radial teeth; and calibrating the annular roughed-out face teeth with a shaping tool, the shaping tool comprising a pressing head having an annular calibration facing teeth, wherein the shaping tool is pressed against the annular roughed-out face teeth of the annular collar with a predetermined axial force (F), thereby engaging the annular calibration facing teeth with the annular roughed-out face teeth to form the finished face teeth, wherein the pressing head remains coaxial with axis A when pressed against the annular collar; and wherein the annular calibration teeth of the pressing head comprise a plurality of second radial teeth arranged annularly and alternating annularly with a plurality of second radial concavities, the plurality of second radial concavities delimited by a respective plurality of bottom wall having a second rounded circumferential profile that defines a shape of the first rounded circumferential profile of the ridges of the plurality of finished radial teeth of the finished face teeth.

2 . The method of claim 1 , wherein the ridges of the plurality of first radial teeth have a flat circumferential profile.

3 . The method of claim 2 , wherein the plurality of first radial concavities have a third rounded circumferential profile identical to the first rounded circumferential profile.

4 . The method of claim 1 , wherein the plurality of annular calibration teeth press against a respective plurality of opposing flanks of the plurality of first radial teeth to make a metal material of the cold plastic deformation of the plurality of annular roughed-out teeth flow into the plurality of second radial concavities and against the respective plurality of bottom walls.

5 . The method of claim 3 , wherein the plurality of annular calibration teeth press against a respective plurality of opposing flanks of the plurality of first radial teeth to make a metal material of the cold plastic deformation of the plurality of annular roughed-out teeth flow into the plurality of second radial concavities and against the respective plurality of bottom walls.

6 . The method of claim 1 , wherein the ridges of the plurality of second radial teeth are made with a flat circumferential profile.

7 . The method of claim 6 , wherein the plurality of second radial teeth have an axial height less than an axial height of the plurality of first radial teeth.

8 . The method of claim 1 , wherein the pressing head is idly supported by the shaping tool such that the pressing head rotates about axis A with respect to the annular roughed-out face teeth.

9 . The method of claim 1 , wherein calibrating the annular roughed out face teeth further comprises a single operation of pressing the shaping tool against the annular roughed-out face teeth in a direction parallel to the axis of symmetry thereby permanently creating the required face teeth with all the ridges of its radial teeth rounded.

10 . A shaping tool for obtaining a finished face teeth on an inner ring, having an axis of symmetry A, of a wheel hub, the finished face teeth comprising a plurality of finished radial teeth having ridges with a first rounded circumferential profile, the plurality of finished radial teeth alternating annularly about the axis A with a plurality of finished concavities, the inner ring being provided with an annular collar at a first extremity, the annular collar having a predetermined radial profile; the shaping tool comprising:
a pressing head provided with an annular calibration face teeth configured to engage with an annular roughed-out face teeth formed on the annular collar by cold plastic deformation, the annular calibration face teeth comprising: a plurality of radial teeth arranged annularly about the axis A and alternating annularly with a plurality of radial concavities, wherein each of the plurality of radial concavities is delimited by a bottom wall having a second rounded circumferential profile exactly reproducing in negative the first rounded circumferential profile of the ridges of the plurality of finished radial teeth of the finished face teeth.

11 . The shaping tool of claim 10 , wherein the pressing head is free to rotate about the axis A relative to the shaping tool and the annular roughed-out face teeth on the annular collar of the outer ring.

12 . The shaping tool of claim 10 , wherein the plurality of radial teeth of the annular calibration face teeth press against respective opposite flanks of an adjacent plurality of radial teeth of the annular roughed-out face teeth such that a metal material of the plastic deformation of the plurality of radial teeth of the annular roughed-out face teeth flow into the plurality of radial concavities of the annular calibration face teeth and against each of the rounded bottom walls.

13 . The shaping tool of claim 10 , wherein the ridges of the plurality of radial teeth of the annular calibration face teeth have a flat circumferential profile.

14 . The shaping tool of claim 13 , wherein the ridges of the plurality of radial teeth of the annular calibration face teeth have an axial height that is less than an axial height of the plurality of finished radial concavities of the finished face teeth.

15 . The shaping tool of claim 11 , wherein the plurality of radial teeth of the annular calibration face teeth press against respective opposite flanks of an adjacent plurality of radial teeth of the annular roughed-out face teeth such that a metal material of the plastic deformation of the plurality of radial teeth of the annular roughed-out face teeth flow into the plurality of radial concavities of the annular calibration face teeth and against each of the rounded bottom walls.

16 . The shaping tool of claim 10 , further comprising:
a plate; a shaft extending axially from the plate; and a rolling bearing connected to the shaft; wherein the pressing head is mounted on the shaft by means of the rolling bearing.

17 . The method of claim 2 , wherein the ridges of the plurality of second radial teeth are made with a flat circumferential profile.

18 . The method of claim 1 , wherein the shaping tool further comprises:
a plate; a shaft extending axially from the plate; and a rolling bearing connected to the shaft; wherein the pressing head is mounted on the shaft by means of the rolling bearing.

19 . The method of claim 1 , wherein an axial height of the plurality of second radial teeth is equal to an axial depth of the plurality of finished radial concavities.

Assignees

• Skf Ab

Inventors

• Bertola Maurizio
• Nicastri Fulvio Carlo
• Re Paolo A

Classifications

• F16C2361/61

  Toothed gear systems, e.g. support of pinion shafts · CPC title

• B21J5/12

  Forming profiles on internal or external surfaces (making screw-thread by forging, pressing, or hammering B21K) · CPC title

• B21D53/265 Primary

  parts of wheels (B21D53/28, B21D53/30 take precedence) · CPC title

• B60B27/0031

  of the axial type, e.g. front teeth · CPC title

• B21K1/30 Primary

  with gear-teeth · CPC title