Joining tool for pressing a disk to a shaft, and rotor shaft for an electric machine

Patent metadata

Field	Value
Publication number	US-12334783-B2
Application number	US-202217690567-A
Country	US
Kind code	B2
Filing date	Mar 9, 2022
Priority date	Apr 30, 2021
Publication date	Jun 17, 2025
Grant date	Jun 17, 2025

Abstract

A joining tool ( 10 ) is provided for pressing a disk ( 12 ) to a shaft ( 14 ) that has opposite first and second ends. The first end ( 18 ) of the shaft ( 14 ) is received in a press table ( 22 ) and the second end ( 24 ) of the shaft ( 14 ) is received in a centering receptacle ( 26 ). A press plate ( 34 ) axially presses the disk ( 12 ) onto the shaft ( 14 ). A resilient ram ( 40 ) is provided on a side of the press plate ( 34 ) that faces toward the disk ( 12 ) and compensates for an axial run-out of the disk ( 12 ) relative to the press plate ( 34 ). The resilient ram ( 40 ) of the joining tool ( 10 ) enables the disk ( 12 ) that has an axial run-out to be pressed onto the shaft ( 14 ) in a correspondingly sloped manner, with the result that a rotor shaft ( 16 ) with a satisfactory bond is made possible.

First claim

What is claimed is:

1. A joining tool for pressing a disk ( 12 ) to a shaft ( 14 ), the shaft having opposite first and second ends ( 18 , 24 ), the joining tool comprising:
a press table ( 22 ) for receiving the first end ( 18 ) of the shaft ( 14 ) in a nonrotatable manner;
a centering receptacle ( 26 ) for receiving the second end ( 24 ) of the shaft ( 14 );
a press plate ( 34 ) for axially pressing the disk ( 12 ) onto the shaft ( 14 ); and
a resilient ram ( 40 ) formed from an elastically deformable material and provided on a side of the press plate ( 34 ) facing toward the disk ( 12 ) for compensating for an axial run-out of the disk ( 12 ) relative to the press plate ( 34 ).

2. The joining tool of claim 1 , wherein the ram ( 40 ) has a segmented contact face ( 44 ) with contact rings ( 44 R) spaced radially from one another and facing toward the disk ( 12 ), intermediate spaces ( 44 S) being defined between the contact rings ( 44 S) for receiving the elastically deformable material of the ram ( 40 ).

3. The joining tool of claim 1 , wherein that the ram ( 40 ) is produced from an elastomeric and/or rubber-elastic material selected so that the ram ( 40 ) is compressible locally by 0.1 mm≤Δε≤10.0 mm in response to a pressing force F of 10 kN≤F≤100 kN.

4. The joining tool of claim 3 , wherein the ram ( 40 ) is produced from an elastomeric and/or rubber-elastic material selected so that the ram ( 40 ) is compressible locally by 0.5 mm≤Δε≤5.0 mm in response to a pressing force F of 10 kN≤F≤100 kN.

5. The joining tool of claim 4 , wherein the ram ( 40 ) is produced from an elastomeric and/or rubber-elastic material selected so that the ram ( 40 ) is compressible locally by Δε=2.0 mm±0.2 mm in response to a pressing force F of 10 kN≤F≤100 kN.

6. The joining tool of claim 1 , wherein the ram ( 40 ) is configured annularly and is spaced radially from the shaft, the ram ( 40 ) being dimension to be provided exclusively in a radially outer radius region of the disk ( 12 ).

7. The joining tool of claim 1 , wherein the centering receptacle ( 26 ) is guided axially displaceably in the press plate ( 34 ).

8. The joining tool of claim 1 , further comprising guide elements ( 34 A) that can engage into cavities ( 12 A) of the disk ( 12 ) for positioning the disk ( 12 ) in a circumferential direction relative to the shaft ( 14 ), the guide elements ( 34 A) being connected to the press plate ( 34 ).

9. The joining tool of claim 1 , further comprising a force gage (FG) for measuring a counterforce that acts on the press plate ( 34 ), the force gage (FG) being connected to a control device (CD) for ending the pressing of the disk ( 12 ) onto the shaft ( 14 ) in response to at least one of a suddenly increasing counterforce and an implausible force-displacement profile.

Assignees

• Porsche Ag

Inventors

• Wurster Peter
• Lamparsky Niklas

Classifications

• B23P11/00

  Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for  (connecting sheet metal or metal tubes, rods or profiles B21D39/00; riveting B21J; soldering, unsoldering, welding B23K; hand tools for connecting wire or strip B25B25/00; connecting metal parts by adhesives F16B11/00) · CPC title

• F16D1/072

  involving plastic deformation (plastic welding F16D1/068) · CPC title

• H02K1/278

  Surface mounted magnets; Inset magnets · CPC title

• B23P19/02 Primary

  for connecting objects by press fit or for detaching same (B23P19/10 takes precedence) · CPC title

• H02K2201/06

  Magnetic cores, or permanent magnets characterised by their skew · CPC title