MOTOR RING AND SPLASH SHIELD ARRANGEMENT FOR A FAN ASSEMBLY

• US 20110273038A1
• Filed: 05/07/2010
• Published: 11/10/2011
• Est. Priority Date: 05/07/2010
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH, Robert Bosch LLC (Robert Bosch GmbH)
• Original Assignee: Robert Bosch GmbH
• Inventors: Naman, Robert, Ray, Bhaskar
• Application Number:
  US12/775,659
• Publication Number:
  US 20110273038A1
• Time in Patent Office: Days
• US Class Current: 310/58
• CPC Class Codes: F04D 25/082 the unit having provision for cooling the motor
• CPC Class Codes: F04D 29/5806 Cooling the drive system
• CPC Class Codes: F04D 29/703 specially for fans, e.g. fan guards
• CPC Class Codes: F04D 29/706 Humidity separation
• CPC Class Codes: H02K 5/10 with arrangements for protection from ingress, e.g. water or fingers
• CPC Class Codes: H02K 5/207 with openings in the casing specially adapted for ambient air
• CPC Class Codes: H02K 9/06 with fans or impellers driven by the machine shaft

Abstract

A fan assembly includes a motor ring and an electric motor supported by the motor ring and including an output shaft defining a central axis, a brush assembly, and a motor end shield having at least one aperture and disposed adjacent the brush assembly. The fan assembly further includes a splash shield adjacent the motor end shield. The splash shield includes a rim having an inner surface in facing relationship with the motor end shield and configured to direct an airflow between the motor end shield and the splash shield in a substantially radial direction toward the central axis, and configured to redirect the substantially radial airflow through the aperture in a direction having both a radial and an axial component with respect to the central axis.

Claims

1. A fan assembly comprising:

a motor ring;

an electric motor supported by the motor ring and including

an output shaft defining a central axis,

a brush assembly, and

a motor end shield having at least one aperture and disposed adjacent the brush assembly; and

a splash shield adjacent the motor end shield, the splash shield including a rim having an inner surface in facing relationship with the motor end shield and configured to direct an airflow between the motor end shield and the splash shield in a substantially radial direction toward the central axis, and configured to redirect the substantially radial airflow through the aperture in a direction having both a radial and an axial component with respect to the central axis.

2. The fan assembly of claim 1, wherein the inner surface of the rim is generally concave.

3. The fan assembly of claim 1, wherein the inner surface of the rim includes

a peripheral, first arcuate portion configured to direct an airflow between the motor end shield and the splash shield in the substantially radial direction toward the central axis, and

a second arcuate portion disposed radially inward of the first arcuate portion and in facing relationship with the aperture, the second arcuate portion configured to redirect the substantially radial airflow, through the aperture, in the direction having both the radial component and the axial component with respect to the central axis.

4. The fan assembly of claim 3, wherein the inner surface of the rim further includes a generally planar portion intermediate the first and the second arcuate portions.

5. The fan assembly of claim 1, wherein the splash shield further includes a hub positioned radially inside the rim.

6. The fan assembly of claim 1, wherein the motor ring includes an outer wall, an inner wall, and a base wall extending between the outer and the inner walls, wherein the outer wall, the inner wall, and the base wall together define a substantially annular channel, and wherein the rim of the splash shield extends into the annular channel between the outer and the inner walls such that a labyrinthine pathway is provided by the outer wall, the base wall, the inner surface of the rim, and the inner wall.

7. The fan assembly of claim 6, wherein the outer wall and an edge of the rim overlap by at least about two millimeters in an axial direction.

8. The fan assembly of claim 7, wherein the inner wall and the edge of the rim overlap by at least about two millimeters in the axial direction.

9. The fan assembly of claim 6, wherein the outer wall and the inner wall extend from the base wall substantially the same distance toward the splash shield in an axial direction.

10. The fan assembly of claim 6, wherein the outer wall includes an arcuate edge.

11. The fan assembly of claim 6, wherein the outer wall and the base wall define an arcuate transition therebetween.

12. The fan assembly of claim 6, wherein the inner wall and the base wall intersect at an angle of about ninety degrees.

13. The fan assembly of claim 6, wherein the inner wall includes a beveled end.

14. The fan assembly of claim 6, wherein a distal end of the inner wall is substantially co-planar with an end surface of the motor end shield.

15. The fan assembly of claim 6, wherein the inner wall includes a lip configured to substantially prevent the radial airflow from leaking between the inner wall and a radially outer surface of the motor.

16. The fan assembly of claim 6, wherein the annular channel has a depth D as measured from an edge of the outer wall to the base wall, and wherein an edge of the rim extends into the annular channel a distance of about 0.1 D to about 0.4 D.

17. The fan assembly of claim 16, wherein the edge of the rim extends into the annular channel a distance of about 0.2 D to about 0.3 D.

18. The fan assembly of claim 16, wherein the annular channel has a width W as measured from a radial inner surface of the outer wall to a radial outer surface of the inner wall, and wherein an edge of the rim extends radially over the annular channel a distance of about 0.4 W to about 0.7 W from the radial outer surface of the inner wall.

19. The fan assembly of claim 18, wherein the edge of the rim extends radially over the annular channel a distance of about 0.5 W to about 0.6 W from the radial outer surface of the inner wall.