Arrangement with an electric motor

• US 20060017341A1
• Filed: 07/11/2005
• Published: 01/26/2006
• Est. Priority Date: 07/21/2004
• Status: Active Grant

• Current Assignee: Ebm-Papst St Georgen GmbH & Company KG (Ebm-Papst Mulfingen GmbH & Company KG)
• Original Assignee: Ebm-Papst St Georgen GmbH & Company KG (Ebm-Papst Mulfingen GmbH & Company KG)
• Inventors: Hahn, Alexander, Nickel-Jetter, Matthias
• Granted Patent: US 7,211,916 B2
• Time in Patent Office: Days
• US Class Current: 310/91
• CPC Class Codes: H02K 21/22 with magnets rotating around the armatures, e.g. flywheel magnetos
• CPC Class Codes: H02K 5/00 Casings; Enclosures; Supports
• CPC Class Codes: H02K 5/1735 radially supporting the rotary shaft at only one end of the rotor H02K5/1737 takes precedence
• CPC Class Codes: H02K 5/225 Terminal boxes or connection arrangements specially adapted for submersible motors H02K5/132

Abstract

An arrangement with an electric motor facilitates mounting of the motor, particularly of a miniature or subminiature motor. The motor (20) has a stator (56), a rotor (24), and a support flange (36) coupled to the motor. A motor mount (22) is formed with an opening (94) for engagement with the support flange (36). The opening has, on its rim, a motor-side shoulder (96) that has a substantially frustoconical shape and faces axially toward the motor (20) after mounting. The support flange (36) is shaped for guidance of a snap-lock element (82) that extends along at least a portion of the circumference of the support flange (36) and is resiliently deflectable radially inward, by means of an inwardly directed force. The snap-lock element (82) is so configured that it snap-locks outward against the motor-side shoulder (96) of the opening (94) when the motor is mounted.

Claims

1. A motor mounting arrangement comprising

an electric motor (20) having a support flange (36) associated therewith, said support flange having a circumference;

and

a snap-lock element (82) for securing said support flange within an opening (94) formed in a mount (22) annularly surrounding said motor,

wherein

a circumferential surface of the flange (36) is configured for mounting in said opening (94);

a central plane (P) through said opening (94) separates a motor-side space (MS) from a flange-side space (FS);

said mount (22) is formed with a substantially frustoconical shoulder (96) in said motor-side space (MS);

and the snap-lock element (82) extends circumferentially along at least a portion of said circumference, is resiliently deflectable in a radially inward direction, and is adapted to lock against said frustoconical motor-side shoulder (96) when said motor (20) is mounted in said opening (94).

2. The arrangement according to claim 1, wherein

the support flange (36) is provided with a radial enlargement (66) which is so configured that, when said motor is mounted in said opening, said radial enlargement extends on a side of the opening that is axially remote from the motor.

3. The arrangement according to claim 1, wherein the snap-lock element is implemented as a snap ring (82;

82′

).

4. The arrangement according to claim 1, wherein the snap-lock element (82;

82′

) is implemented as a conical ring.

5. The arrangement according to claim 1, wherein the snap-lock element (82;

82′

) is formed with at least one engagement opening (84) for engagement of an actuation tool.

6. The arrangement according to claim 5, wherein the snap-lock element (82;

82′

) has approximately the shape of a C, and is formed with an engagement opening (84) on each limb of the C.

7. The arrangement according to claim 5, wherein the support flange (36) is equipped with at least one defined break location (112, 114), by the breaking of which an opening is creatable through which an engagement opening (84) of the snap-lock element (82;

82′

) is accessible.

8. The arrangement according to claim 7, wherein the support flange (36) is equipped in at least two areas (102, 104) with defined break locations (112, 114) which make possible the creation of two openings for access to two engagement openings (84) of the snap-lock element (82;

82′

).

9. The arrangement according to claim 1, wherein

a sealing element (90) is arranged between a periphery of the support flange (36) and the opening (94).

10. The arrangement according to claim 9, wherein said sealing element (90) hermetically seals off said motor-side space (MS) from said flange-side space.

11. The arrangement according to claim 9, wherein the sealing element is implemented as an O-ring (90) arranged in a groove (89) on the peripheral circumference of the support flange (36).

12. The arrangement according to claim 9, wherein

the sealing element (90) is formed of elastic material and is so configured that a load is applied to it, as a result of contact of the snap-lock element (82;

82′

) against the frusto-conical motor-side shoulder (96) of the opening (94).

13. The arrangement according to claim 1, wherein the snap-lock element (82;

82′

) is a radially resilient part.

14. The arrangement according to claim 12, wherein

the radially resilient part (82;

82′

) is equipped with radially inwardly projecting protrusions (86) that are in engagement with corresponding depressions (88) of a recess (80) provided for reception of the snap-lock element (82;

82′

).

15. The arrangement according to claim 14, wherein the recess, provided for reception of the radially resilient part (82;

82′

), is implemented, at least locally, as an annular groove (80).

16. The arrangement according to claim 1, wherein

the opening (94), provided for reception of the support flange (36), is formed, on its side serving for introduction of the support flange (36), with a ramped, substantially frustoconical surface (92).

17. The arrangement according to claim 1, wherein the electric motor is implemented as an external-rotor motor (20) having an external rotor (24) and an internal stator (56), which stator is secured to the support flange (36).

18. The arrangement according to claim 17, wherein the external rotor (24) comprises a shaft (30), and wherein a bearing tube (34), in which that shaft (30) is journaled, is arranged on the support flange (36).

19. The arrangement according to claim 18,

wherein the bearing tube (34) is formed integrally with the support flange (36) and is closed off in fluid-tight fashion at its end facing toward the support flange (36).

20. The arrangement according to claim 1,

wherein the internal stator (56) is configured so as to pull the external rotor (24) toward the support flange (36) by exerting a magnetic force.

21. The arrangement according to claim 20,

wherein, for generation of the magnetic force, at least one permanent magnet (28) of the external rotor (24) is axially offset relative to ferromagnetic elements (59) of the internal stator (56).

22. A motor mounting arrangement comprising

an electric motor (20) having a support flange (36) associated therewith, said support flange having a circumference;

and

a snap-lock element (82) for securing said support flange within an opening (94) formed in a mount (22) annularly surrounding said motor,

wherein

a circumferential surface of the flange (36) is configured for mounting in said opening (94);

a central plane (P) through said opening (94) separates a motor-side space (MS) from a flange-side space (FS);

said mount (22) is formed with a substantially frustoconical shoulder (96) in said motor-side space (MS);

and the snap-lock element (82) extends circumferentially along at least a portion of said circumference, is formed with at least one engagement opening (84) for engagement of an actuation tool, is resiliently deflectable in a radially inward direction, and is adapted to lock against said frustoconical motor-side shoulder (96) when said motor (20) is mounted in said opening (94).

23. The arrangement according to claim 22, wherein the snap-lock element (82;

82′

) has approximately the shape of a C, and is formed with an engagement opening (84) on each limb of the C.

24. The arrangement according to claim 22, wherein the support flange (36) is equipped with at least one defined break location (112, 114), by the breaking of which an opening is creatable through which an engagement opening (84) of the snap-lock element (82;

82′

) is accessible.

25. The arrangement according to claim 22, wherein the support flange (36) is equipped in at least two areas (102, 104) with defined break locations (112, 114) which make possible the creation of two openings for access to two engagement openings (84) of the snap-lock element (82;

82′

).

26. A motor mounting arrangement comprising

an electric motor (20) having a support flange (36) associated therewith, said support flange having a circumference;

and

a snap-lock element (82) for securing said support flange within an opening (94) formed in a mount (22) annularly surrounding said motor,

wherein

a circumferential surface of the flange (36) is configured for mounting in said opening (94);

a central plane (P) through said opening (94) separates a motor-side space (MS) from a flange-side space (FS);

a sealing element (90) is arranged between a periphery of the support flange (36) and the opening (94);

said mount (22) is formed with a substantially frustoconical shoulder (96) in said motor-side space (MS);

and the snap-lock element (82) extends circumferentially along at least a portion of said circumference, is resiliently deflectable in a radially inward direction, and is adapted to lock against said frustoconical motor-side shoulder (96) when said motor (20) is mounted in said opening (94).

27. The arrangement according to claim 26, wherein said sealing element (90) hermetically seals off said motor-side space (MS) from said flange-side space.

28. The arrangement according to claim 26, wherein the sealing element is implemented as an O-ring (90) arranged in a groove (89) on the periphery circumference of the support flange (36).

29. The arrangement according to claim 26, wherein

the sealing element (90) is formed of elastic material and is so configured that a load is applied to it, as a result of contact of the snap-lock element (82;

82′

) against the frusto-conical motor-side shoulder (96) of the opening (94).