Rotary electrical machine comprising shaft with stepped diameters, and method for assembly of the machine

Patent metadata

Field	Value
Publication number	US-10284035-B2
Application number	US-201615255340-A
Country	US
Kind code	B2
Filing date	Sep 2, 2016
Priority date	Sep 3, 2015
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

A rotary electrical machine comprising a front magnet wheel, a rear magnet wheel, and a shaft comprising four sections with respective diameters (D 1 , D 2 , D 3 , D 4 ), distributed axially, wherein:
the first section comprises knurling which is configured such as to ensure radial retention between the shaft and the front magnet wheel; the second section is configured to permit the indexing and centring of the front and rear magnet wheels; the third section comprises knurling which is configured to ensure radial retention between the shaft and the rear magnet wheel; and the fourth section comprises a collar which is configured to ensure the axial retention between the shaft and at least one magnet wheel, and in that the diameters (D 1 , D 2 , D 3 , D 4 ) of the shaft comply with the following equation:

D 1< D 2< D 3< D 4.

First claim

The invention claimed is:

1. A rotary electrical machine ( 10 ), comprising:
a front magnet wheel ( 230 );
a rear magnet wheel ( 205 ); and
a shaft ( 100 ) including a first section ( 110 ) having a first diameter (D 1 ), a second section ( 115 ) having a second diameter (D 2 ), a third section ( 120 ) having a third diameter (D 3 ) and a fourth section ( 125 ) having a fourth diameter (D 4 );
the first, second, third and fourth sections ( 110 , 115 , 120 , 125 ) of the shaft ( 100 ) are distributed axially, wherein:
the first section ( 110 ) comprises a knurled part ( 130 ) configured to ensure radial retention between the shaft ( 100 ) and the front magnet wheel ( 230 );
the second section ( 115 ) comprises a smooth surface and is configured to permit the indexing and centering of the front and rear magnet wheels ( 230 , 205 );
the third section ( 120 ) comprises a knurled part ( 135 ) configured to ensure radial retention between the shaft ( 100 ) and the rear magnet wheel ( 205 ); and
the fourth section ( 125 ) comprises a collar ( 140 ) configured to ensure an axial retention between the shaft ( 100 ) and at least one of the front and rear magnet wheels ( 205 , 230 ),

and wherein the first, second, third and fourth diameters (D 1 , D 2 , D 3 , D 4 ) of the shaft ( 100 ) comply with the following equation:
D 1< D 2< D 3< D 4.

2. The rotary electrical machine ( 10 ) according to claim 1 , wherein the front magnet wheel ( 230 ) comprises:
a clamping area ( 210 ) complementary to at least part of the first section ( 110 ); and
a centering area ( 215 ) complementary to at least part of the second section ( 115 ),
and wherein the rear magnet wheel ( 205 ) comprises:
a centering area ( 220 ) complementary to at least part of the second section ( 115 ); and
a clamping area ( 225 ) complementary to at least part of the third section ( 120 ).

3. The rotary electrical machine ( 10 ) according to claim 2 , wherein the centering area ( 215 ) of the front magnet wheel ( 230 ) and the centering area ( 220 ) of the rear magnet wheel ( 205 ) have different lengths.

4. The rotary electrical machine ( 10 ) according to claim 3 , wherein a length of the rear magnet wheel ( 205 ) is shorter than a sum of the lengths of the centering areas ( 220 and 215 ) of the rear and front magnet wheels ( 215 and 220 ).

5. The rotary electrical machine ( 10 ) according to claim 4 , wherein at least one of the knurled parts ( 130 , 135 ) includes point-to-point knurling, wherein bases of successive protuberances ( 405 ) which form the point-to-point knurling are in contact with one another.

6. The rotary electrical machine ( 10 ) according to claim 4 , wherein at least one of the knurled parts ( 130 , 135 ) includes spaced point knurling, wherein bases of two successive protuberances ( 410 ) which form the spaced point knurling are separated from one another by a substantially flat surface.

7. The rotary electrical machine ( 10 ) according to claim 3 , wherein only a portion of the knurled part ( 130 ) of the first section ( 110 ) is covered by the front magnet wheel ( 230 ).

8. The rotary electrical machine ( 10 ) according to claim 3 , wherein at least one of the knurled parts ( 130 , 135 ) includes point-to-point knurling, wherein bases of successive protuberances ( 405 ) which form the point-to-point knurling are in contact with one another.

9. The rotary electrical machine ( 10 ) according to claim 3 , wherein at least one of the knurled parts ( 130 , 135 ) includes spaced point knurling, wherein bases of two successive protuberances ( 410 ) which form the spaced point knurling are separated from one another by a substantially flat surface.

10. A method ( 30 ) for assembly of the rotary electrical machine ( 10 ) according to claim 2 , comprising the following steps:
fitting ( 305 ) the shaft ( 100 ) on the front and rear magnet wheels ( 230 , 205 );
indexing ( 310 ) the centering areas ( 215 , 220 ) of the front and rear magnet wheels ( 230 , 205 ) on the second section ( 115 ) of the shaft ( 100 );
clamping ( 315 ) the clamping area ( 210 ) of the front magnet wheel ( 230 ) on the first section ( 110 ) of the shaft ( 100 ); and
clamping ( 320 ) the clamping area ( 225 ) of the rear magnet wheel ( 205 ) on the third section ( 120 ) of the shaft ( 100 ); and
forming abutment ( 325 ) of the rear magnet wheel ( 205 ) on the collar ( 140 ) of the fourth section ( 125 ).

11. The rotary electrical machine ( 10 ) according to claim 2 , wherein only a portion of the knurled part ( 130 ) of the first section ( 110 ) is covered by the front magnet wheel ( 230 ).

12. The rotary electrical machine ( 10 ) according to claim 2 , wherein at least one of the knurled parts ( 130 , 135 ) includes point-to-point knurling, wherein bases of successive protuberances ( 405 ) which form the point-to-point knurling are in contact with one another.

13. The rotary electrical machine ( 10 ) according to claim 2 , wherein at least one of the knurled parts ( 130 , 135 ) includes spaced point knurling, wherein bases of two successive protuberances ( 410 ) which form the spaced point knurling are separated from one another by a substantially flat surface.

14. The rotary electrical machine ( 10 ) according to claim 1 , wherein only part of the knurled part ( 130 ) of the first section ( 110 ) is covered by the front magnet wheel ( 230 ).

15. The rotary electrical machine ( 10 ) according to claim 14 , wherein at least one of the knurled parts ( 130 , 135 ) includes point-to-point knurling, wherein bases of successive protuberances ( 405 ) which form the point-to-point knurling are in contact with one another.

16. The rotary electrical machine ( 10 ) according to claim 14 , wherein at least one of the knurled parts ( 130 , 135 ) includes spaced point knurling, wherein bases of two successive protuberances ( 410 ) which form the spaced point knurling are separated from one another by a substantially flat surface.

17. The rotary electrical machine ( 10 ) according to claim 1 , wherein at least one of the knurled parts ( 130 , 135 ) includes point-to-point knurling, wherein bases of successive protuberances ( 405 ) which form the point-to-point knurling are in contact with one another.

18. The rotary electrical machine ( 10 ) according to claim 17 , wherein at least one of the knurled parts ( 130 , 135 ) includes spaced point knurling, wherein bases of two successive protuberances ( 410 ) which form the spaced point knurling are separated from one another by a substantially flat surface.

19. The rotary electrical machine ( 10 ) according to claim 1 , wherein at least one of the knurled parts ( 130 , 135 ) includes spaced point knurling, wherein bases of two successive protuberances ( 410 ) which form the spaced point knurling are separated from one another by a substantially flat surface.

Assignees

• Valeo Equip Electr Moteur

Inventors

• Bilteryst Pierre-Yves
• Delianne Henri
• Margueritte David
• Balthaze Patrice
• Jozefowiez Eric
• Mouret Franck
• Perreaut Sylvain
• Debruyne Hubert

Classifications

• H02K1/2706 Primary

  Inner rotors · CPC title

• H02K1/243

  of the claw-pole type · CPC title

• H02K7/003 Primary

  Couplings; Details of shafts (means for mounting rotors on shafts H02K1/28) · CPC title

• H02K1/28

  Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures · CPC title

• H02K15/022

  with salient poles · CPC title