U.S. patent application number 13/262462 was filed with the patent office on 2012-03-15 for double fan for a heat exchanger, in particular a coolant radiator of a motor vehicle.
This patent application is currently assigned to ROBERT BOSCH GMBH. Invention is credited to Asli Arslan-Huerst, Joerg Eigenmann, Jochen Goehre, Thomas Helming, Klaus Linnenbrock.
Application Number | 20120063887 13/262462 |
Document ID | / |
Family ID | 42133651 |
Filed Date | 2012-03-15 |
United States Patent
Application |
20120063887 |
Kind Code |
A1 |
Goehre; Jochen ; et
al. |
March 15, 2012 |
DOUBLE FAN FOR A HEAT EXCHANGER, IN PARTICULAR A COOLANT RADIATOR
OF A MOTOR VEHICLE
Abstract
The utilization of double fans for engine cooling of motor
vehicles is known. Said fans generate a flow of air which then
serves to cool a heat exchanger, in particular a coolant radiator
for motor vehicles. The double fan is herein characterized by an
optimal use of the surface of the coolant radiator that is to be
cooled, so as to be able to achieve a cooling performance as high
as possible. The assembly of the double fan has up to now been such
that a separate electric motor is provided for each blower. The
double fan (1) for a heat exchanger (2), in particular a coolant
radiator of a motor vehicle, has a first blower (4) and a second
blower (5). According to the invention, the first driven blower (4)
drives the second blower (5) by way of a transmission element (10)
provided on the outer surface (11) of the first blower and an outer
surface (12) of the second blower (5). The double fan is provided
for a heat exchanger, in particular a coolant radiator of a motor
vehicle.
Inventors: |
Goehre; Jochen; (Karlsruhe,
DE) ; Linnenbrock; Klaus; (Changsha, CN) ;
Eigenmann; Joerg; (Achern, DE) ; Helming; Thomas;
(Baden-Baden, DE) ; Arslan-Huerst; Asli;
(Karlsruhe, DE) |
Assignee: |
ROBERT BOSCH GMBH
Stuttgart
DE
|
Family ID: |
42133651 |
Appl. No.: |
13/262462 |
Filed: |
February 2, 2010 |
PCT Filed: |
February 2, 2010 |
PCT NO: |
PCT/EP1020/151212 |
371 Date: |
November 16, 2011 |
Current U.S.
Class: |
415/122.1 |
Current CPC
Class: |
F04D 29/326 20130101;
F01P 2005/025 20130101; F01P 5/04 20130101; F04D 25/166
20130101 |
Class at
Publication: |
415/122.1 |
International
Class: |
F01D 15/12 20060101
F01D015/12 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 31, 2009 |
DE |
102009002030.6 |
Claims
1. A double fan for a heat exchanger, which double fan has a first
fan and a second fan, characterized in that the first fan (4) is
driven and drives the second fan (5) via a transmission element
(10) which is provided on a circumferential face (11) of the first
fan (4) and a circumferential face (12) of the second fan (5).
2. The double fan as claimed in claim 1, characterized in that the
transmission element (10) is formed by a first toothing system (15)
which is formed on the circumferential face (11) of the first fan
(4) and by a second toothing system (16) which is correspondingly
formed on the circumferential face (12) of the second fan (5),
which toothing systems (15, 16) both engage into one another for
torque transmission.
3. The double fan as claimed in claim 1, characterized in that the
transmission element (10) is formed by a first circumferential
element (21) which surrounds the first circumferential face (11)
and by a second circumferential element (22) which surrounds the
second circumferential face (12), which circumferential elements
(21, 22) both make torque transmission possible by means of at
least one of a frictional connection and a positively locking
connection.
4. The double fan as claimed in claim 3, characterized in that the
first and second circumferential elements (21, 22) comprise at
least one of belt or rubber elements (25, 26) which are tensioned
over the respective circumferential faces (11, 12) of the fans (4,
5) and, bearing against one another, both make torque transmission
possible as a result of a frictional connection.
5. The double fan as claimed in claim 3, characterized in that the
first and second circumferential elements (21, 22) comprise
frictional coatings which are applied to the respective
circumferential faces (11, 12) of the fans (4, 5) and make torque
transmission possible as a result of a frictional connection.
6. The double fan as claimed in claim 3, characterized in that the
first and second circumferential elements (21, 22) comprise toothed
belts (27, 28) which are tensioned over the respective
circumferential faces (11, 12) of the fans (4, 5) and engage into
one another with their profile on an outer side and make torque
transmission possible as a result of a positively locking
connection.
7. The double fan as claimed in claim 3, characterized in that the
first and second circumferential elements (21, 22) comprise
profiled coatings which are applied to the respective
circumferential faces (11, 12) of the fans (4, 5) and make torque
transmission possible as a result of a positively locking
connection.
8. The double fan as claimed in claim 7, characterized in that the
profiled coatings are sprayed onto the circumferential faces (11,
12).
9. The double fan as claimed in claim 1, characterized in that the
heat exchanger is a coolant radiator of a motor vehicle.
Description
BACKGROUND OF THE INVENTION
[0001] The present invention relates to a double fan for a heat
exchanger, in particular a coolant radiator of a motor vehicle,
which double fan has a first fan and a second fan.
[0002] It is known to use double fans for engine cooling of motor
vehicles. They generate an air flow which then serves to cool a
heat exchanger, in particular a coolant radiator for motor
vehicles. Here, the double fan is distinguished by optimum
utilization of the face to be cooled of the coolant radiator, in
order thus for it to be possible to achieve as high a cooling
performance as possible. The double fan has been constructed up to
now such that a dedicated electric motor is provided for each
fan.
SUMMARY OF THE INVENTION
[0003] In contrast, the double fan according to the invention for a
heat exchanger, in particular a coolant radiator of a motor
vehicle, has the advantage of a considerably simplified and more
compact construction and, in particular, that the production costs
can be reduced greatly. A previously necessary second electric
motor can therefore be dispensed with. Moreover, the development of
noise of the double fan overall can advantageously be reduced.
[0004] A transmission element can thus be formed in a simple way by
a first toothing system which is formed on the circumferential face
of the first fan and by a second toothing system which is
correspondingly formed on the circumferential face of the second
fan, which toothing systems both engage into one another for torque
transmission.
[0005] Satisfactory torque transmission can also be achieved if the
transmission element is formed by a first circumferential element
which surrounds the first circumferential face and by a second
circumferential element which surrounds the second circumferential
face, which circumferential elements both make torque transmission
possible by means of a frictional connection and/or by means of a
positively locking connection.
[0006] In one advantageous embodiment, the first and second
circumferential elements can comprise belt or rubber elements which
are tensioned over the circumferential face of the fans and,
bearing against one another, both make torque transmission possible
as a result of a frictional connection.
[0007] In a further advantageous embodiment, the first and second
circumferential elements can comprise frictional coatings which are
correspondingly applied to the circumferential faces of the fans
and make torque transmission possible as a result of a frictional
connection.
[0008] In a further advantageous embodiment, the first and second
circumferential elements can comprise toothed belts which are
tensioned over the circumferential face of the fans and engage into
one another with their profile on the outer side and make torque
transmission possible as a result of a positively locking
connection.
[0009] In a further advantageous embodiment, the first and second
circumferential elements can comprise profiled coatings which are
applied to the circumferential faces of the fans and make torque
transmission possible as a result of a positively locking
connection.
[0010] It is advantageous in terms of production technology to
simply spray the profiled coatings onto the circumferential
faces.
BRIEF DESCRIPTION OF THE_DRAWINGS
[0011] Exemplary embodiments of the invention are explained in
greater detail in the following description and clarified further
using the drawings.
[0012] In the drawings:
[0013] FIG. 1 shows a simplified plan view of the double fan
according to the invention, a transmission region being indicated
by A, illustrated bordered by a dashed line,
[0014] FIG. 2 shows, in an enlarged illustration, the transmission
region A with a viewing direction from the front toward the teeth
of a provided toothing system for the fans,
[0015] FIG. 3 shows the transmission region A with a viewing
direction toward the circumferential face or the fan belt of the
fan according to an alternative embodiment,
[0016] FIG. 4 shows the transmission region A with a viewing
direction toward the circumferential face or the fan belt of the
fan according to a further alternative embodiment,
[0017] FIG. 5 shows a further embodiment of the double fan
according to the invention, in which belt or rubber elements are
provided, and
[0018] FIG. 6 shows a further embodiment of the double fan
according to the invention, in which toothed belts are
provided.
DETAILED DESCRIPTION
[0019] FIG. 1 shows a plan view of a double fan 1 according to the
invention for a heat exchanger 2. The heat exchanger 2, also called
heat transmitter, is, for example, a conventional coolant radiator
of a motor vehicle, as is usually provided for engine cooling. The
double fan 1 has two fans 4, 5, a driven first fan 4 being mounted
in a known way on an electric motor. The electric motor is
indicated diagrammatically in FIG. 1 by a square 6. The second fan
5 is mounted on a provided bearing block 7 which is indicated
diagrammatically in FIG. 1 by a circle. Both fans 4, 5 are arranged
in such a way that they preferably make contact with one another on
the circumferential side at a single point in the center
(intersecting point of the diagonal) of the rectangular heat
exchanger 2. This point or the transmission region is indicated in
FIG. 1 by A, bordered by a dashed line.
[0020] It is then provided according to the invention to drive the
second fan 5 directly via the first fan 4 which is driven by the
electric motor 6, with the result that there is a positive drive
for the second fan 5. The second fan 5 simply runs together with
the first fan 4. As a result of the second freewheeling fan 5
running together with the first fan 4, it is then possible to
dispense with a previously necessary separate electric drive or
motor for the second fan 5 and to replace it with a simple bearing
point. As a result of this construction, approximately 3/4 of the
costs for an otherwise necessary second electric motor of the
second fan 5 can be saved. However, the additional expenditure for
the bearing block 7 and the structural measures for both fans 4, 5
use approximately 1/4 of the saved costs. Moreover, it is
advantageous that a construction of the two fans 4, 5 in a common
frame can be dispensed with.
[0021] To this end, there are several possibilities for the
positive drive of the second fan 5. A common feature is a
transmission element 10 between the fans 4, 5, which transmission
element 10 assumes the transmission of the torque of the first fan
4 to the second fan 5. Here, according to the invention, the
transmission element 10 is provided or formed on a circumferential
face 11 of the first fan 4 and a circumferential face 12 of the
second fan 5. As FIG. 2 shows in greater detail in an enlarged
illustration of the transmission region A with a viewing direction
from the front, the transmission element 10 can be configured in
the form of a toothing system, a first toothing system 15 for the
first fan 4 and a second toothing system 16 for the second fan 5.
By means of the transmission element 10 or the toothing system 15,
16, a circumferential force and a normal force can be transmitted
from the first fan 4 to the second fan 5 as far as possible without
noise. A toothing system 15, 16 is formed in each case both on the
circumferential face 11 of the first fan 4 and on the
circumferential face 12 of the second fan 5, whereupon there are
two gearwheels of a gear mechanism which engage into one
another.
[0022] Here, the profile of the toothing system 15, 16 can
correspond to that of a gearwheel, as FIG. 3, an illustration of
the transmission region A with a viewing direction toward the
circumferential face 11 of the fan 4, shows in greater detail.
However, it is also possible, as FIG. 2, an illustration of the
transmission region A with a viewing direction toward the
circumferential face 11 of the fan 4, shows in greater detail to
provide a changing toothing system 15 which is offset in the
circumferential direction with correspondingly offset teeth for the
profile. The toothing system 16 for the second fan 5 would then
also be configured in a complementary way.
[0023] The circumferential face 11, 12, which is cylindrical at
least in regions, of each fan 4, 5 surrounds its blades 7, 8 on the
outer side, and can therefore also be called outer belt or fan
belt. The fans 4, 5 are preferably axial fans which can also be
called circumferential fans on account of the cylindrical
circumferential face 11, 12. The outer belt 11, 12 which surrounds
the blades 7, 8 is usually provided, in order for it to be possible
to reduce air turbulences of the fan vanes or blades 7, 8.
[0024] In one modification, the transmission element 10 can also be
formed by a first circumferential element 21 which surrounds the
first circumferential face 11 and by a second circumferential
element 22 which surrounds the second circumferential face 12,
which circumferential elements 21, 22 then make torque transmission
possible by means of a frictional connection and/or by means of a
positively locking connection. Thus, in an embodiment according to
FIG. 5, the first and second circumferential elements 21, 22 can
comprise belt or rubber elements 25, 26 which are in each case
tensioned over the circumferential face 11, 12 of the fans 4, 5 and
which then, bearing against one another in a lightly pressed
manner, bring about torque transmission from the driven first fan 4
to the second fan 5 as a result of a frictional connection.
[0025] A further possibility comprises configuring the first and
second circumferential elements 21, 22 in the form of a frictional
coating (not shown in greater detail) which is applied
correspondingly as it were as a second layer to the circumferential
faces 11, 12 and then brings about a frictional connection and
therefore torque transmission from the driven first fan 4 to the
second fan 5, likewise by both circumferential faces 11, 12 being
pressed onto one another. The fans 4, 5 including the outer belt
are usually produced from plastic. The frictional coating can, for
example, be simply sprayed onto the circumferential faces 11,
12.
[0026] It is also conceivable, as FIG. 6 shows, to provide toothed
belts 27, 28 for the first and second circumferential elements 21,
22, which toothed belts 27, 28 are tensioned over the
circumferential face 11, 12 of the fans 4, 5 and engage into one
another with their toothed profile on the outer side, in order to
make torque transmission possible as a result of a positively
locking connection. It is also possible, instead of the toothed
belt, to apply the corresponding profile itself directly onto the
circumferential faces 11, 12. To this end, profiled coatings which
are shown by way of example in FIGS. 3 and 4 can be provided as
toothing systems 15, 16, which profiled coatings are applied to the
circumferential face 11, 12 and make torque transmission possible
as a result of a positively locking connection. In a simple way,
the profiled coatings can be sprayed onto the circumferential faces
11, 12 which afterward have, for example, structures according to
FIGS. 3 and 4.
* * * * *