Shaft-hub component and method for manufacturing a component of this type

• US 8,646,181 B2
• Filed: 11/19/2008
• Issued: 02/11/2014
• Est. Priority Date: 11/30/2007
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Baumann, Matthias, Koeninger, Juergen, Schuster, Eduard, Ernst, Edgar, Zink, Alfred, Vierling, Juergen
• Primary Examiner(s): Bryant, David
• Assistant Examiner(s): WILENSKY, MOSHE K
• Application Number:
  US12/745,475
• Publication Number:
  US 20110050029A1
• Time in Patent Office: 1,910 Days
• Field of Search: 298/932
• US Class Current: 29/893.2
• CPC Class Codes: B21J 13/02 Dies or mountings therefor
• CPC Class Codes: B21J 5/12 Forming profiles on internal or external surfaces making screw-thread by forging, pressing, or hammering B21K
• CPC Class Codes: B23P 11/00 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 Class Codes: F16D 1/072 involving plastic deformation plastic welding F16D1/068
• CPC Class Codes: F16D 1/0858 due to the elasticity of the hub (including shrink fits)
• CPC Class Codes: F16D 2300/10 Surface characteristics; Details related to material surfaces
• CPC Class Codes: H02K 1/28 Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
• CPC Class Codes: H02K 15/028 for fastening to casing or support, respectively to shaft or hub
• CPC Class Codes: Y10T 29/49011 Commutator or slip ring assembly
• CPC Class Codes: Y10T 29/49465 Gear mounting

Abstract

The present invention relates to a method for manufacturing a shaft-hub component (1) having a shaft (2), a hub component (3; 10; 11; 12) and a shaft-hub connection for an armature of an electrical machine, comprising the steps: hardening of the shaft (2) at least on the outer lateral surface (6) of said shaft (2), shaping of the hardened shaft (2) such that a partial region (L1; L2; L3; L4) of said shaft (2) is shaped in such a manner that at least one radially projecting section (4) and one radially indented section (5) are produced and joining of said shaped shaft (2) and the hub component (3, 10, 11, 12) to the shaft-hub component so that said shaft-hub connection includes an interference fit at the projecting section (4), a hardness of said hub component (3; 10; 11; 12) being less than a surface layer hardness of said shaft (2). The invention further relates to a shaft-hub component for an armature of an electrical machine.

Claims

1. Method for manufacturing a shaft-hub component having a shaft, a hub component and a shaft-hub connection for an armature of an electrical machine, comprising the steps:

hardening a surface layer of the shaft, wherein the surface layer of the shaft has a thickness from about 0.01 mm to about 0.1 mm, and wherein the hardening of the surface layer results in a hardness of 200 to 500 HV (hardness according to Vickers),

shaping of the shaft such that a partial region of said shaft is shaped in such a manner that at least a radially projecting section and a radially indented section are produced, and wherein the radially indented sections are indented further than the thickness of the surface layer, and

joining of the shaped shaft and the hub component to the shaft-hub component so that the shaft-hub connection includes an interference fit on the projecting section, a hardness of said hub component being less than a surface layer hardness of said shaft.

2. The method according to claim 1, wherein the shaped partial region of the shaft has a length in the axial direction of the shaft that is equal to or shorter than an axial length of the hub component.

3. The method according to claim 1, wherein the step of shaping the shaft takes place using a cylindrical section of a shaping tool or using planar punching.

4. The method according to claim 1, wherein the step of shaping the shaft takes place using a notching strip with an elongate tip.

5. The method according to claim 1, wherein a plurality of shaped partial regions is formed synchronously or consecutively on the shaft.

6. The method according to claim 1, wherein the shaping of a partial region of the shaft is carried out at exactly two positions of said shaft lying opposite each other.

7. The method according to claim 1, wherein the shaping of a partial region of the shaft is carried out at exactly three positions of said shaft, the three positions being disposed in each case at an angle of 120°

on the circumference of said shaft, and wherein the three positions are shaped simultaneously.

8. The method according to claim 1, wherein the shaping of a partial region of the shaft is carried out at exactly four positions of said shaft, the four positions being disposed in each case at an angle of 90°

on the circumference of said shaft, and wherein the four positions are shaped simultaneously.

9. The method according to claim 1, wherein the shaft has a diameter of said shaft between 4 mm and 10 mm.

10. The method according to claim 1, wherein the hardness on the outer lateral surface of the shaft lies in the range of 240 and 380 HV (hardness according to Vickers).

11. The method according to claim 1, wherein the shaping is performed by a die having at least a cylinder shaped projection contacting the shaft.

12. The method according to claim 11, wherein the die has three cylinder shaped projections contacting the shaft.

13. The method according to claim 12, wherein the cylinder shaped projections are spaced 120°

apart.

14. The method according to claim 12, wherein three radially projecting areas and three radially indented sections are produced.

15. The method according to claim 11, wherein the radially indented sections are indented further than the thickness of the surface layer.

16. The method according to claim 15, wherein the shaping is performed without penetrating the surface layer.

17. The method according to claim 1, wherein the shaping is performed by a die having at least a level punching face contacting the shaft.

18. The method according to claim 17, wherein the die has three level punching faces.

19. The method according to claim 18, wherein the level punching faces are spaced 120°

apart.

20. The method according to claim 19, wherein three radially projecting areas are produced.

21. The method according to claim 1, wherein the shaping is performed by a pressing tool comprising notching strips having edges, wherein the edges are radially spaced apart by about 90°

.

22. The method according to claim 21, wherein the pressing tool has a pressing direction, and wherein each edge is formed by two surfaces, the first surface being generally parallel to the pressing direction and the second surface being generally perpendicular to the pressing direction.

23. The method according to claim 1, wherein the shaft has two ends, the ends having a first diameter, and wherein the shaped partial region is between the ends.