CONICAL SPRING WASHER FOR MOUNTING A STATOR IN THE HOUSING OF AN ELECTRICAL MACHINE

• US 20130193801A1
• Filed: 08/26/2011
• Published: 08/01/2013
• Est. Priority Date: 10/07/2010
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Schmid, Joerg, Mahfoudh, Samir, Heier, Christoph, Muschelknautz, Claudius, Koenig, Tilo, Thiery, Jerome
• Application Number:
  US13/878,050
• Publication Number:
  US 20130193801A1
• Time in Patent Office: Days
• US Class Current: 310/216.131
• CPC Class Codes: H02K 1/185 to outer stators

Abstract

An electrical machine (100) comprises a housing (110), a stator (200) arranged in the housing and a conical spring washer (300), which holds the stator (200) in its installed position by means of a predetermined axial spring force (F_A). In this case, the conical spring washer (300) comprises an annular base body (310), which is attached to a housing inner wall (110) by means of an attachment device (330), as well as a number of spring structures (320) which extend from the annular base body (310) in the direction of the stator (200) and support the stator (200) axially.

Claims

1. An electrical machine (100) comprising a housing (110), a stator (200) arranged in the housing and a conical spring washer (300), which holds the stator (200) in an installed position by means of a predetermined axial spring force (F_A), wherein the conical spring washer (300) comprises an annular base body (310), which is attached to a housing inner wall (110) by an attachment device (330), and a number of spring structures (320) which extend from the annular base body (310) in the direction of the stator (200) and support said stator (200) axially by means of the spring force (F_A).

2. The electrical machine according to claim 1, wherein the spring structures (320) are designed in the shape of bent sheet metal tongues.

3. The electrical machine (100) according to claim 1, wherein the spring structures (320) are helically bent around the annular base body (310).

4. The electrical machine (100) according to claim 1, wherein the conical spring washer (300) comprises at least one limiting element (340) for delimiting the maximum compression of the spring structures (320).

5. The electrical machine (100) according to claim 4, wherein the limiting element (340) is formed by an end section (323) of the spring structure (320) which is bent in the direction of the annular base body (310) and which comes to rest on a locating surface (314) of said annular base body (310) upon achieving maximum compression.

6. The electrical machine (100) according to claim 1, wherein the attachment device (330) is designed in the form of an expansion device disposed along the outer circumference (311) of the annular base body (310), wherein the expansion device (330) is disposed within the housing (110) in a radially compressed manner such that a pressure exerted by said expansion device (330) onto the housing inner wall (111) causes the conical spring washer (300) to be fixed in said housing (110).

7. The electrical machine (100) according to claim 6, wherein the attachment device (330) comprises a plurality of expansion wings (331) arranged in a star-shaped pattern along the outer circumference (311) of the annular base body (310), wherein the expansion wings (331) are disposed within the housing (110) in a radially compressed manner such that a pressure exerted by said expansion wings (331) onto the housing inner wall (111) causes the conical spring washer (300) to be fixed in said housing (110).

8. The electrical machine (100) according to claim 7, wherein the expansion wings (331) are in each case associated in pairs with a common spring structure (320) which is disposed in each case between the two expansion wings (331).

9. The electrical machine (100) according to claim 1, wherein the annular base body comprises recessed sections (312) which engage into an interstice (230) between each two pole shoes (220) of the stator (200) and wherein the spring structures (320) are disposed in the recessed sections (312) of the annular base body (310).

10. The electrical machine (100) according to claim 1, wherein the conical spring washer (300) is designed as a component produced from spring steel by means of a stamping process.

11. The electrical machine (100) according to claim 1, wherein the electrical machine (100) is designed as a drive for a power unit in a motor vehicle.