Fan wheel, radiator fan module and motor vehicle having the radiator fan module

Patent metadata

Field	Value
Publication number	US-10697467-B2
Application number	US-201816122153-A
Country	US
Kind code	B2
Filing date	Sep 5, 2018
Priority date	Sep 5, 2017
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

A fan wheel has a hub cup and a plurality of blades which are arranged on the hub cup and extend radially outward from an outer wall of the hub cup which is in particular at least substantially cylindrical. Each blade has a leading edge and a trailing edge, wherein for at least one blade, an axial unit depth z*(t) of the blade has an aperiodically wave-like shape. A radiator fan module has a fan wheel of the type described above, and the fan wheel can be used in a motor vehicle.

First claim

The invention claimed is:

1. A fan wheel, comprising:
a hub cup having an outer wall; and
a plurality of blades disposed on said hub cup and extending radially outwardly from said outer wall of said hub cup, each of said blades having a leading edge and a trailing edge, wherein for at least one of said blades, the following applies:
a reference line is defined by:
a first point on an axis of rotation of said fan wheel;
a radial extent of the reference line goes through the first point and perpendicular to the axis of rotation; and
a second point that bisects an arcuate edge into two equal sections at a transition from said hub cup to said at least one blade;
a reference plane being defined by a line displaced parallel to the axis of rotation and a line displaced parallel to the reference line, a displacement being such that, viewed in a direction of rotation of the fan wheel, it is located entirely behind said one at least one blade;
an orthogonal projection of said leading edge of said at least one blade and an orthogonal projection of said trailing edge of said at least one blade are mapped in the reference plane;
a z-axis is defined in the reference plane by an orthogonal projection of the axis of rotation in the reference plane, which is displaced parallel outward in a radial direction in the reference plane from the orthogonal projection of the axis of rotation around an outer radius of the hub cup;
wherein in the reference plane a y-axis is defined by an orthogonal projection of a radial extent in the reference plane;
wherein a relative unit radius t(r) is plotted on the y-axis, and is defined as follows:

t
⁡

(
r
)

=

r
-

R
i

R
a

-

R

i
⁢

wherein:
R i is the outer radius of said hub cup, which corresponds at least substantially to an inner radius of said at least one blade;
R a is an outer radius of said at least one blade; and
r is a distance between the axis of rotation and a sectional plane under consideration, which is at distance r perpendicular from the axis of rotation on the reference line, wherein r∈[R i ;R a ];

wherein an axial unit depth z*(t) of said at least one blade is plotted on the z-axis, and is defined as follows:

z
*

⁡

(
t
)

=

z
HK

⁡

(
t
)

-

z
VK

⁡

(
t
)

R
a

-

R
i

,

wherein
z VK (t) is a z-coordinate of the orthogonal projection of the leading edge in the sectional plane passing through t; and
z HK (t) is a z-coordinate of the orthogonal projection of the trailing edge in the section plane passing through t;
wherein a progression of the axial unit depth z*(t) has an aperiodically wave-like shape.

2. The fan wheel according to claim 1 , wherein said orthogonal projection of said leading edge is flat or curved.

3. The fan wheel according to claim 1 , wherein said at least one blade, viewed in a direction of rotation, is a forward-swept blade.

4. The fan wheel according to claim 1 , further comprising an at least substantially circular outer ring which links to tips of said blades.

5. The fan wheel according to claim 1 , wherein the progression of the axial unit depth z*(t) has a global minimum in a range of 65% to 90% of the relative unit radius t(r) of said at least one blade.

6. The fan wheel according to claim 1 , wherein the progression of the axial unit depth z*(t) has no or at most one high point in a y-direction after a global minimum.

7. The fan wheel according to claim 1 , wherein the progression of the axial unit depth z*(t) has an at least substantially continuously rising or falling profile in a range of 0% to 50% of the relative unit radius t(r) of said at least one blade.

8. The fan wheel according to claim 1 , wherein the progression of the axial unit depth z*(t), as a function of the relative unit radius t(r), satisfies the following condition:

z
*

⁡

(
t
)

=

(

A
1

⁢

t
2

+

A
2

⁢
t

)

⁢

cos
⁡

[

2
⁢
π
⁢

⁢

N
⁡

(

a
⁡

Assignees

• Brose Fahrzeugteile

Inventors

• Froh Christian
• Mauss Michael

Classifications

• F04D29/325 Primary

  for axial flow fans (blade mountings F04D29/34, blades F04D29/38) · CPC title

• F01P5/02

  Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers · CPC title

• F04D29/38

  Blades {(for axial flow compressors F04D29/324)} · CPC title

• F04D29/326

  comprising a rotating shroud · CPC title

• F01P5/06

  Guiding or ducting air to, or from, ducted fans · CPC title