Wet-operated armature

Patent metadata

Field	Value
Publication number	US-10103598-B2
Application number	US-201414897563-A
Country	US
Kind code	B2
Filing date	Jun 5, 2014
Priority date	Jun 10, 2013
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

The present invention relates to a wet-operated armature of an electric machine, in particular of an electric motor for a fuel pump, said armature comprising a main body and a commutator, wherein the armature is surrounded by a sleeve which fully encloses the main part and the commutator in a circumferential direction. The present invention further relates to the armature sleeve, to an electric machine comprising the armature and to a fuel pump comprising the electric machine. The present invention further relates to a method for producing the armature.

First claim

The invention claimed is:

1. A wet-operated armature ( 1 ) of an electric machine, comprising a main body ( 4 ) and a commutator ( 7 ), which are disposed concentrically around a shaft ( 2 ) that extends in an axial direction ( 21 ), characterized in that the main body and the commutator are surrounded by a sleeve ( 6 ), which fully surrounds the main body ( 4 ) and the commutator ( 7 ) in a circumferential direction ( 23 ) around the shaft ( 2 ), wherein the sleeve ( 6 ) is in the shape of a pot and has a base ( 66 ) that extends transversely in relation to the shaft ( 2 ), and wherein the sleeve ( 6 ) has a surround ( 65 ) disposed on the base ( 66 ), wherein the surround ( 65 ) extends concentrically around the shaft ( 2 ) and has an open end ( 65 ) opposite the base ( 4 ), and wherein the surround ( 65 ) has no openings between the open end ( 65 ) and the base ( 66 ).

2. The wet-operated armature ( 1 ) as claimed in claim 1 , characterized in that the commutator ( 7 ) has commutator segments ( 71 ), which are disposed transversely in relation to the shaft ( 2 ).

3. The wet-operated armature ( 1 ) as claimed in claim 1 , characterized in that the sleeve ( 6 ) is produced from a non-magnetic metal.

4. The wet-operated armature ( 1 ) as claimed in claim 1 , characterized in that the sleeve ( 6 ) has a wall thickness ( 63 ) of 0.05-0.5 mm.

5. The wet-operated armature ( 1 ) as claimed in claim 1 , characterized in that the sleeve ( 6 ) is deep-drawn.

6. The wet-operated armature ( 1 ) as claimed in claim 1 , characterized in that the armature has fixing means ( 62 ), by which the sleeve ( 6 ) is fixed against axial displacement.

7. An electric machine having a wet-operated armature ( 1 ) as claimed in claim 1 .

8. A fuel pump having an electric motor, which has a wet-operated armature as claimed in claim 1 .

9. The wet-operated armature ( 1 ) as claimed in claim 1 , wherein the sleeve ( 6 ) is produced as a single piece, and wherein the base ( 66 ) extends transversely in relation to an axis ( 20 ), the surround ( 65 ) extends concentrically around the axis ( 20 ), and the sleeve further includes a fitting aid ( 61 ), which is disposed on the surround ( 65 ) and extends concentrically around the axis ( 20 ).

10. The sleeve as claimed in claim 9 , characterized in that the fitting aid ( 61 ) is a fitting chamfer, which is formed by offsetting the surround ( 65 ) outward at an angle.

11. The wet-operated armature ( 1 ) as claimed in claim 1 , characterized in that the sleeve ( 6 ) is produced from non-magnetic high-grade steel.

12. The wet-operated armature ( 1 ) as claimed in claim 1 , characterized in that the sleeve ( 6 ) has a wall thickness ( 63 ) of 0.15-0.4 mm.

13. The wet-operated armature ( 1 ) as claimed in claim 1 , characterized in that the armature has fixing means ( 62 ), by which the sleeve ( 6 ) is fixed against axial displacement, on the main body ( 4 ).

14. The wet-operated armature ( 1 ) as claimed in claim 1 , wherein the sleeve ( 6 ) surrounds the main body ( 4 ) and the commutator ( 7 ) such that the sleeve ( 6 ) prevents ingress of a liquid into the main body ( 4 ) and the commutator ( 7 ).

15. The wet operated armature ( 1 ) as claimed in claim 1 , characterized in that the main body ( 4 ) and the commutator ( 7 ) are completely inside the sleeve ( 6 ).

16. A wet-operated armature ( 1 ) of an electric machine, comprising a main body ( 4 ) and a commutator ( 7 ), which are disposed concentrically around a shaft ( 2 ) that extends in an axial direction ( 21 ), characterized in that the armature ( 1 ) is surrounded by a sleeve ( 6 ), which fully surrounds the main body ( 4 ) and the commutator ( 7 ) in a circumferential direction ( 23 ) around the shaft ( 2 ) wherein, at a first end (HO) of the armature ( 1 ), between the sleeve ( 6 ) and the shaft ( 2 ), and at a second end ( 120 ) of the armature ( 1 ), between the sleeve ( 6 ) and the commutator ( 7 ), a respective seal is provided.

17. The wet-operated armature ( 1 ) as claimed in claim 16 , wherein the seal is an O-ring ( 51 , 52 ).

18. The wet-operated armature ( 1 ) as claimed in claim 16 , wherein the seal prevents ingress of a liquid into the sleeve ( 6 ).

19. A wet-operated armature ( 1 ) of an electric machine configured to be surrounded by liquid, comprising:
a main body ( 4 );
a commutator ( 7 ), wherein the main body ( 4 ) and the commutator ( 7 ) are disposed concentrically around a shaft ( 2 ) that extends in an axial direction ( 21 ); and
a sleeve defining an interior ( 69 ) in which the main body ( 4 ) and the commutator ( 7 ) are positioned, wherein the sleeve ( 6 ) is in the shape of a pot and has a base ( 66 ) that extends transversely in relation to the shaft ( 2 ), and wherein the sleeve ( 6 ) has a surround ( 65 ) disposed on the base ( 66 ), wherein the surround ( 65 ) extends concentrically around the shaft ( 2 ) and has an open end ( 65 ) opposite the base ( 4 ), and wherein the sleeve ( 6 ) prevents ingress of a liquid into the interior ( 69 ) of the sleeve ( 6 ).

20. The wet-operated armature ( 1 ) as claimed in claim 19 , characterized in that the sleeve ( 6 ) is produced from non-magnetic high-grade steel.

21. The wet-operated armature ( 1 ) as claimed in claim 19 , characterized in that the sleeve ( 6 ) has a wall thickness ( 63 ) of 0.15-0.4 mm.

22. The wet operated armature ( 1 ) as claimed in claim 19 , characterized in that the main body ( 4 ) and the commutator ( 7 ) are completely inside the sleeve ( 6 ).

Assignees

• Bosch Gmbh Robert

Inventors

• Thiery Jerome
• Monzie Benoit
• Stucke Ursula

Classifications

• H02K5/128 Primary

  using air-gap sleeves or air-gap discs · CPC title

• H02K5/12

  specially adapted for operating in liquid or gas (combined with cooling arrangements H02K9/00) · CPC title

• H02K2005/1287

  Electricity · mapped topic

• H02K15/022

  with salient poles · CPC title

• H02K5/1285 Primary

  of the submersible type · CPC title