Flanged inner ring optimized for orbital forming operation and associated tool

Patent metadata

Field	Value
Publication number	US-11072201-B2
Application number	US-201916420743-A
Country	US
Kind code	B2
Filing date	May 23, 2019
Priority date	Jun 8, 2018
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

Flanged inner ring of a rolling bearing forming part of a wheel hub unit of motor vehicles, having at its axially inner end a rolling edge configured to preload axially a radially inner ring after being plastically deformed by orbital forming. The rolling edge is provided with a conical surface of an axially inner portion of the rolling edge. A first parameter is defined as being the ratio between the conicity of the conical surface expressed in degrees and the thickness of the rolling edge expressed in millimeters and assumes values ranging between 0.03 mm −1 and 2 mm −1 .

First claim

What is claimed is:

1. A flanged inner ring of a rolling bearing for a wheel hub unit used for motor vehicles, the flanged inner ring comprising:
a rolling edge at its axially inner end configured to axially preload a radially inner ring after being plastically deformed by means of an orbital forming, wherein
the rolling edge comprises a conical surface of an axially internal portion of the rolling edge, and wherein
a first parameter that is defined as the quotient between the conicity (α) of the conical surface, expressed in degrees, and the thickness (s) of the rolling edge, expressed in millimeter, is in a range between 0.03° mm −1 and 2° mm −1 .

2. The flanged inner ring according to claim 1 , wherein the conicity (α) of the conical surface is in a range between 0.2° and 6°.

3. The flanged inner ring according to claim 1 , wherein a second parameter (h) which is defined as the quotient between the conicity (α) of the conical surface, expressed in degrees, and the length (L) of the rolling edge, expressed in millimeters, is in a range between 0.125° mm −1 and 0.5° mm −1 .

4. The flanged inner ring according to claim 3 , wherein the conicity (α) is comprised between 2° and 4°.

5. The flanged inner ring according to claim 1 , wherein the length (L) of the conical surface of the axially internal portion is between 5 mm and 8 mm.

6. The flanged inner ring according to claim 5 , wherein the length (L) is between 6 mm and 7 mm.

7. The flanged inner ring according to claim 1 , wherein a fillet radius (R) between the conical surface and an axially inner plane surface of the rolling edge has a length between 0.5 mm and 2.5 mm.

8. The flanged inner ring according to claim 7 , wherein the length of the fillet radius (R) is approximately equal to 1.5 mm.

9. A wheel hub unit for motor vehicles, comprising a flanged inner ring provided with a radially inner raceway and a bearing unit, the bearing unit comprising:
a radially outer ring provided with respective radially outer raceways,
a radially inner ring provided with a radially inner raceway,
a plurality of rolling bodies positioned between the respective internal and external raceways, and
a rolling edge at its axially inner end configured to axially preload a radially inner ring after being plastically deformed by means of an orbital forming, wherein
the rolling edge comprises a conical surface of an axially internal portion of the rolling edge, and wherein
a first parameter that is defined as the quotient between the conicity (α) of the conical surface, expressed in degrees, and the thickness (s) of the rolling edge, expressed in millimeter, is in a range between 0.03° mm −1 and 2° mm −1 .

Assignees

• Skf Ab

Inventors

• Nicastri Fulvio
• Morello Fausto

Classifications

• B21D19/04

  shaped as rollers · CPC title

• F16C33/58

  Raceways; Race rings · CPC title

• F16C2226/52

  with plastic deformation, e.g. caulking or staking · CPC title

• B21D19/046

  for flanging edges of tubular products · CPC title

• F16C33/585

  of raceways, e.g. ribs to guide the rollers · CPC title