Housing configuration for an electric machine with cooling jacket

Patent metadata

Field	Value
Publication number	US-10476352-B2
Application number	US-201715803802-A
Country	US
Kind code	B2
Filing date	Nov 5, 2017
Priority date	Nov 10, 2016
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

A housing configuration for an electric machine includes a housing having a stator receiving region with a wall. A stator is disposed in the stator receiving region of the housing and a sleeve is pushed onto the stator. A cooling jacket surrounds the stator for liquid cooling of the stator. The cooling jacket has a radially outer cooling-jacket surface and a radially inner cooling-jacket surface with a gap between the radially outer cooling-jacket surface and the radially inner cooling-jacket surface. The wall of the stator receiving region forms the radially outer cooling-jacket surface of the cooling jacket. The sleeve forms the radially inner cooling-jacket surface of the cooling jacket. Bilaterally acting seal carriers are inserted into the gap between the radially outer cooling-jacket surface and the radially inner cooling-jacket surface. The bilaterally acting seal carriers provide an axial sealing of the cooling jacket. An electric machine is also provided.

First claim

What is claimed is:

1. A housing configuration for an electric machine, comprising:
a housing having a stator receiving region with a wall;
a stator disposed in said stator receiving region of said housing;
a sleeve pushed onto said stator;
said wall and said sleeve being separately formed components;
a cooling jacket surrounding said stator for liquid cooling of said stator, said cooling jacket having a radially outer cooling-jacket surface and a radially inner cooling-jacket surface with a gap between said radially outer cooling-jacket surface and said radially inner cooling-jacket surface;
said cooling jacket being a substantially annular cylindrical cooling jacket, wherein said radially outer cooling-jacket surface and said radially inner cooling-jacket surface define a substantially hollow cylindrical shape encircling said stator;
said wall of said stator receiving region forming said radially outer cooling-jacket surface of said cooling jacket;
said sleeve forming said radially inner cooling-jacket surface of said cooling jacket; and
bilaterally acting seal carriers inserted into the gap between said radially outer cooling-jacket surface and said radially inner cooling-jacket surface, said bilaterally acting seal carriers providing an axial sealing of said cooling jacket.

2. The housing configuration according to claim 1 , including:
a centering ring;
said centering ring providing a torque support of said stator on said housing; and
said stator having axial ends and being supported at at least one of said axial ends on said housing by said centering ring.

3. The housing configuration according to claim 2 , including:
a bearing shield; and
said centering ring together with said bearing shield being fastened to said housing.

4. The housing configuration according to claim 2 , including:
a bearing shield; and
said centering ring together with said bearing shield being screwed to said housing.

5. The housing configuration according to claim 2 , wherein said centering ring is integrally formed with one of said bilaterally acting seal carriers.

6. The housing configuration according to claim 2 , wherein said centering ring and one of said bilaterally acting seal carriers are formed together as a single piece.

7. The housing configuration according to claim 1 , wherein:
each of said bilaterally acting seal carriers is formed with at least one first annular groove for receiving a seal which seals with respect to said radially outer cooling-jacket surface; and
each of said bilaterally acting seal carriers is formed with at least one second annular groove for receiving a seal which seals with respect to said sleeve.

8. The housing configuration according to claim 1 , wherein each of said bilaterally acting seal carriers is formed with at least one first molded-on seal for sealing with respect to said radially outer cooling-jacket surface and with at least one second molded-on seal for sealing with respect to said sleeve.

9. The housing configuration according to claim 1 , wherein said sleeve is formed from metal and has a radial wall thickness of no greater than 1.0 mm.

10. The housing configuration according to claim 1 , wherein said stator is formed from a plurality of stator laminations, said stator laminations are held together by said sleeve and said stator laminations are sealed with respect to said cooling jacket by said sleeve.

11. The housing configuration according to claim 1 , including at least one insert provided in said cooling jacket, said at least one insert functioning as a flow guiding element.

12. The housing configuration according to claim 1 , wherein said housing is a cast metal part.

13. An electric machine comprising:
a stator and a rotor;
a housing having a stator receiving region with a wall;
said stator being disposed in said stator receiving region of said housing;
a sleeve pushed onto said stator;
said wall and said sleeve being separately formed components;
a cooling jacket surrounding said stator for liquid cooling of said stator, said cooling jacket having a radially outer cooling-jacket surface and a radially inner cooling-jacket surface with a gap between said radially outer cooling-jacket surface and said radially inner cooling-jacket surface;
said cooling jacket being a substantially annular cylindrical cooling jacket, wherein said radially outer cooling-jacket surface and said radially inner cooling-jacket surface define a substantially hollow cylindrical shape encircling said stator;
said wall of said stator receiving region forming said radially outer cooling-jacket surface of said cooling jacket;
said sleeve forming said radially inner cooling-jacket surface of said cooling jacket; and
bilaterally acting seal carriers inserted into the gap between said radially outer cooling-jacket surface and said radially inner cooling-jacket surface, said bilaterally acting seal carriers providing an axial sealing of said cooling jacket.

Assignees

• Volkswagen Ag

Inventors

• Braun Andreas
• Wohlfeld Christine
• Knorr Patric

Classifications

• H02K1/185

  to outer stators · CPC title

• H02K5/06

  Cast metal casings · CPC title

• H02K9/197 Primary

  in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator · CPC title

• H02K1/20

  with channels or ducts for flow of cooling medium · CPC title

• H02K5/20

  with channels or ducts for flow of cooling medium · CPC title