SOLENOID ASSEMBLY HAVING SLOTTED STATOR

• US 20090139491A1
• Filed: 12/04/2007
• Published: 06/04/2009
• Est. Priority Date: 12/04/2007
• Status: Active Grant

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Krishnaswamy, Harish, Joshi, Mandar A., Bunni, Nadeem N., Coldren, Dana R.
• Granted Patent: US 7,552,719 B2
• Time in Patent Office: Days
• US Class Current: 123/476
• CPC Class Codes: F02M 63/0015 electrical, e.g. using solenoid
• CPC Class Codes: H01F 2007/1676 Means for avoiding or reducing eddy currents in the magnetic circuit, e.g. radial slots
• CPC Class Codes: H01F 2007/1692 Electromagnets or actuators with two coils
• CPC Class Codes: H01F 7/081 Magnetic constructions
• CPC Class Codes: H01F 7/127 Assembling
• CPC Class Codes: H01F 7/1638 Armatures not entering the winding
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor

Abstract

A solenoid assembly is disclosed. The solenoid assembly has a housing having a cavity disposed therein. The solenoid assembly also has a unitary stator having a plurality of separated portions. The separated portions are held together by at least one lip located on an outer periphery of the stator. The stator is sized to fit within the cavity disposed in the housing.

Claims

1. A solenoid assembly, comprising:

a housing having a cavity disposed therein; and

a unitary stator having a plurality of separated portions divided by radially extending slots and held together by at least one lip located on an outer periphery of the stator, the stator being sized to fit within the cavity disposed in the housing.

2. The solenoid assembly of claim 1, wherein the radially extending slots include three slots that extend from a central passageway.

3. The solenoid assembly of claim 1, wherein the stator is fixedly coupled to the housing.

4. The solenoid assembly of claim 1, wherein the stator has an elliptical shape.

5. The solenoid assembly of claim 1, wherein the stator includes a top portion, a bottom portion, and a flange disposed between the top portion and the bottom portion.

6. The solenoid assembly of claim 5, wherein the at least one lip is located on the flange.

7. The solenoid assembly of claim 5, wherein the radially extending slots extend through the top portion and the bottom portion and only partially extending through the flange.

8. The solenoid assembly of claim 5, wherein the flange includes a recess.

9. A method of forming a solenoid assembly including:

forming a plurality of internal slots in a stator and leaving lip on an outer periphery of stator to maintain unitary structure of stator, the slots extending radially from the stator;

compressing the stator and placing it in a housing having an inner cavity configured to receive the stator;

expanding the stator so that it contacts the housing; and

securing the stator to the housing.

10. The method of claim 9, further including permanently securing the stator to the housing.

11. The method of claim 9, further including forming three internal slots in the stator.

12. The method of claim 9, wherein compressing the stator and placing it in the housing having an inner cavity configured to receive the stator includes:

undersizing the cavity within the housing relative to the stator; and

compressing the stator so that it fits within the cavity.

13. The method of claim 9, wherein forming the plurality of internal slots in the stator includes cutting slots in a top portion, a bottom portion, and a flange disposed between the top portion and the bottom portion of the stator.

14. The method of claim 13, wherein forming the plurality of internal slots in the stator includes forming slots that extend completely through the top portion and the bottom portion but only partially through the flange.

15. The method of claim 9, wherein the stator has an elliptical shape.

16. A fuel injector comprising:

a solenoid assembly;

the solenoid assembly including a housing having a cavity disposed therein; and

a unitary stator having a central passageway and a plurality of slots extending radially outward from the central passageway, the stator being held together by a lip located on an outer periphery of the stator and sized to fit within the cavity disposed in the housing.

17. The fuel injector of claim 16, wherein the plurality of slots include three slots.

18. The fuel injector of claim 16, wherein the stator has an elliptical shape.

19. The fuel injector of claim 16, wherein the stator is permanently coupled to the housing.

20. The fuel injector of claim 16, wherein the stator includes a top portion, a bottom portion, and a flange, and wherein the lip is located on the flange and the flange is annularly disposed between the top portion and the bottom portion.