U.S. patent application number 12/576747 was filed with the patent office on 2010-04-15 for cooling system.
Invention is credited to Jorg Dittmann, Bernhard Schwalk.
Application Number | 20100089043 12/576747 |
Document ID | / |
Family ID | 41503633 |
Filed Date | 2010-04-15 |
United States Patent
Application |
20100089043 |
Kind Code |
A1 |
Dittmann; Jorg ; et
al. |
April 15, 2010 |
COOLING SYSTEM
Abstract
The present invention relates to a cooling system (1) for an
internal combustion engine, in particular an exhaust gas cooling
system in a motor vehicle, having a housing (2) in which a heat
transmission device (4) is arranged in a first canal (3). The
housing (2) is configured as a metal pressure die-cast housing and
has according to the invention an integrated second canal (6) that
is formed by housing contours (5, 5'), said second canal being
configured as a bypass canal and bypassing the heat transmission
device (4).
Inventors: |
Dittmann; Jorg; (Stuttgart,
DE) ; Schwalk; Bernhard; (Ludwigsburg, DE) |
Correspondence
Address: |
RADER, FISHMAN & GRAUER PLLC
39533 WOODWARD AVENUE, SUITE 140
BLOOMFIELD HILLS
MI
48304-0610
US
|
Family ID: |
41503633 |
Appl. No.: |
12/576747 |
Filed: |
October 9, 2009 |
Current U.S.
Class: |
60/320 |
Current CPC
Class: |
F28D 9/0031 20130101;
F28F 3/048 20130101; F28F 2215/06 20130101; F28F 2255/14 20130101;
F02M 26/32 20160201; F28F 27/02 20130101; F28D 21/0003 20130101;
F28F 21/084 20130101; F28F 3/022 20130101; F28F 21/081 20130101;
F02M 26/25 20160201 |
Class at
Publication: |
60/320 |
International
Class: |
F01N 3/02 20060101
F01N003/02 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 10, 2008 |
DE |
10 2008 051 268.0 |
Claims
1. A cooling system for an internal combustion engine, comprising:
a pressure die-casting housing, wherein a heat transmission device
is provided in a first canal, wherein the housing has an integrated
second canal formed by housing contours, said second canal being
configured as a bypass canal and bypassing the heat transmission
device.
2. The cooling system as specified in claim 1, wherein a pivotable
bypass flap providing a flow division is effected between the first
canal and the second canal.
3. The cooling system as specified in claim 1, wherein the housing
has a first part and a second part.
4. The cooling system as specified in claim 3, wherein cooling
contours, cooling ribs, are on at least one of the two housing
parts, said cooling contours protruding into the first canal,
generally perpendicular to the direction of flow.
5. The cooling system as specified in claim 3, wherein cooling
contours are on both of the two housing parts, said cooling
contours engaging with one another when the housing is in the
assembled state.
6. The cooling system as specified in claim 4, wherein at least one
of the cooling contours is hollow and is flowed through by a
cooling fluid.
7. The cooling system as specified in claim 4, wherein at least one
of the cooling contours includes a blind hole that is acted upon by
a cooling fluid.
8. The cooling system as specified in claim 1, wherein the housing
is a light metal pressure die-cast housing, such as an aluminium
pressure die-cast housing.
9. The cooling system as specified in claim 1, wherein the housing
is a magnesium or zinc pressure die-cast housing.
10. The cooling system as specified in claim 2, wherein the housing
has two parts.
11. The cooling system as specified in claim 4, wherein cooling
contours are on both of the two housing parts, said cooling
contours engaging with one another when the housing is in the
assembled state.
12. The cooling system as specified in claim 5, wherein at least
one of the cooling contours is hollow and is flowed through by a
cooling fluid.
13. The cooling system as specified in claim 5, wherein at least
one of the cooling contours includes a blind hole that is acted
upon by a cooling fluid.
14. The cooling system as specified in claim 6, wherein at least
one of the cooling contours includes a blind hole that is acted
upon by a cooling fluid.
15. The cooling system as specified in claim 2, wherein the housing
is a light metal pressure die-cast housing, such as an aluminium, a
magnesium or a zinc pressure die-cast housing.
16. The cooling system as specified in claim 3, wherein the housing
is a light metal pressure die-cast housing, such as an aluminium, a
magnesium or a zinc pressure die-cast housing.
17. The cooling system as specified in claim 4, wherein the housing
is a light metal pressure die-cast housing, such as an aluminium, a
magnesium or a zinc pressure die-cast housing.
18. The cooling system as specified in claim 5, wherein the housing
is a light metal pressure die-cast housing, such as an aluminium, a
magnesium or a zinc pressure die-cast housing.
19. The cooling system as specified in claim 6, wherein the housing
is a light metal pressure die-cast housing, such as an aluminium, a
magnesium or a zinc pressure die-cast housing.
20. The cooling system as specified in claim 7, wherein the housing
is a light metal pressure die-cast housing, such as an aluminium, a
magnesium or a zinc pressure die-cast housing.
Description
[0001] The present invention relates to a cooling system for an
ICE, in particular an exhaust-gas cooling system in a motor
vehicle, according to the preamble of claim 1.
[0002] A cooling system of the generic kind is, for example,
disclosed in document DE 10 2005 045 103 B32 in which a heat
transmission device is provided in a housing. The heat transmission
device consists of an upper part and a lower part from which
pin-shaped ribs extend in a canal in the heat transmission device.
In particular, a degree of efficiency of the cooling system is
intended to hereby be increased in comparison to known
solutions.
[0003] An additional such cooling system is, for example, disclosed
in document DE 10 2005 045 098 A1.
[0004] Document DE 10 2004 025 185 A1 discloses an air intake canal
system that has a collecting inlet canal in which a cooling system
is integrated. The collecting inlet canal is divided into two
separate canals for this purpose, whereby of the two canals,
exhaust gas flows through a first and air flows through a second
during normal operation, and whereby during normal operation, the
canal through which air flows can serve as a bypass canal in the
warming-up phase. The entire air intake canal system is conceived
in such a manner that it can be assembled simply by placing the
individual parts one atop the other. A considerably reduced
quantity of parts in comparison to known systems is hereby intended
to be achieved in particular.
[0005] Finally, DE 20 2006 009 464 U1 discloses a heat exchanging
device having a canal through which coolant flows and a canal
through which a fluid flows that is to be cooled, wherein both of
the canals are separated from one another by a wall. Ribs extend
from this wall into at least one of the canals, wherein each rib
has a line-shaped inflow canal and two line-shaped outflow canals.
The inflow and outflow canals border two continuously extending
side walls of the ribs.
[0006] The present invention addresses the problem of providing for
a cooling system of the generic kind an improved embodiment that is
simple to manufacture as well as accurately controlled or regulated
while having at the same time a structurally simple design.
[0007] This problem is solved according to the invention by the
subject matter of independent claim 1. Advantageous embodiments are
the subject matter of the independent claims.
[0008] The present invention is based on the general concept of
equipping a cooling system, which is for cooling exhaust gases in a
motor vehicle, with a housing composed of die-cast metal and
furthermore to integrate in this housing both a first canal, in
which a heat transmission device is arranged, as well as a second
canal that is configured as a bypass canal and that bypasses the
heat transmission device. At least the second canal is configured
by means of housing contours that form an integral component of the
die-cast metal housing. Separate parts for realising the individual
canals can thereby be dispensed with in such a manner that in order
to manufacture the cooling system according to the invention, only
the heat transmission device must still be positioned or arranged
in the first canal and subsequent thereto the housing can then be
closed, wherein upon closing the housing, wherein both of the
canals are already formed owing to the housing contours that are
provided in an integral manner. It goes without saying that it is
also conceivable that the heat transmission device also forms an
integral component of the housing, for example in the style of
integrally moulded cooling ribs. Separation walls, which are to be
provided separately, can thereby likewise be dispensed with, by
means of which the cooling system according to the invention is
configured in a structurally simple manner. Moreover, a material
that is nearly unaffected by temperature is discovered the use of
die-cast metal for the housing, said material itself withstanding
high temperatures such as, for example, that can arise in an
exhaust gas system of an internal combustion engine. The provision
of the housing contours, which from at least the second canal in
the housing upon assembly of said housing, can be realised by a
correspondingly simple design or configuration of an injection
mould. With the housing according to the invention that is
configured out of die-cast metal and that owing to its
configuration furthermore already forms the two canals lying
therein, costly assembly processes as well as the diversity of the
parts can be considerably reduced in the manufacture of the cooling
system according to the invention.
[0009] In an advantageous development of the solution according to
the invention, a pivotable bypass flap is provided by means of
which a flow division is effected between the first and the second
canal. The bypass flap is actuated or regulated by a corresponding
control/regulation device and distributes the flow, which is
flowing in the cooling system, to the first or second canal. In a
first extremal position of the bypass flap, the entire flow flows
through the first canal and not through the second canal, while the
exact opposite is true in the instance of the second extremal
position of the pivotable bypass flap. In stepless, adjustable
intermediate positions, the flow between the two canals can be
distributed in nearly any manner whatsoever. Such a pivotable
bypass flap makes possible an extraordinarily precise and, with
regard to the required parts, at the same time a cost-effective
control of the gas flow that is flowing in the cooling system.
[0010] In an advantageous embodiment of the solution according to
the invention, the housing is configured as a light alloy die-cast
housing, in particular composed of aluminium die cast. Owing to its
minimal density, aluminium is favoured for use in those
applications in which the mass of a transportation means is
concerned because this contributes to the use of motor fuel. Should
alloy elements, such as, for example, magnesium, silicium, or other
metals be hereby admixed, resistances can be achieved that steel
can hardly outperform. Aluminium has, in addition to minimal
weight, an extremely favourable heat conductivity and is thereby
predestined for use in heat transmission devices. Thus, cooling
contours, such as cooling ribs, can thus be integrally moulded on
the housing, for example, said cooling ribs effecting a cooling of
the exhaust gas stream flowing therethrough, wherein owing to the
high heat conductivity of the aluminium, a particularly favourable
heat exchange can be ensured.
[0011] In yet another advantageous embodiment of the solution
according to the invention, the housing is configured as having two
parts, wherein cooling contours, in particular cooling ribs, are
configured on at least one of the two housing parts, said cooling
contours protrude into the first canal, preferably perpendicular to
the direction of flow. The cooling contours thereby force a flowing
around of the same by means of the hot exhaust gas and an intensive
heat exchange owing to their large surface. To increase their
cooling effect, the cooling contours can be configured as hollow
and flowed through by a cooling fluid. The cooling fluid can be
withdrawn, for example, from a cooling circuit, which likewise
cools the internal combustion engine, in such a manner that a
warming-up phase of the internal combustion engine can be
considerably reduced with the hot exhaust gas and the NO.sub.x
emissions, which are high in particular in this stage, can thereby
be reduced. In general, such cooling systems can also be used for
heating a passenger compartment, wherein the main focus of
attention is directed to reducing the temperature of the exhaust
gas prior to feeding it to a catalyst in order to thereby be able
to generally decrease the pollutant emissions.
[0012] Additional important features and advantages of the
invention can be found in the dependent claims, in the drawings,
and in the pertinent description of the figures with reference to
the drawings.
[0013] It is understood that the features described above and those
to be described in what follows can be used not only in the
particular cited combination; but also in other combinations or
independently without departing from the scope of the present
invention.
[0014] Preferred embodiments of the invention are shown in the
drawings and are described in more detail in the following
description, the same reference numerals referring to components
which are the same or functionally the same or similar.
[0015] It is respectively schematically shown in
[0016] FIG. 1 a cooling system according to the invention in an
exploded view,
[0017] FIG. 2a a sectional representation along the sectional plane
B-B,
[0018] FIG. 2b a view of the cooling system according to the
invention from above,
[0019] FIG. 2c a sectional representation along the sectional plane
A-A,
[0020] FIG. 2d a sectional representation along the sectional plane
C-C.
[0021] Corresponding to FIG. 1, a cooling system 1 according to the
invention for an internal combustion engine, which cooling system
is configured as an exhaust gas cooling system in a motor vehicle,
has a housing 2 in which a heat transmission device 4 is arranged
in a first canal 3. According to the invention, the housing 2 is
configured as a die-cast metal housing and has an integrally second
canal 6 moulded by housing contours 5, 5', which is configured as a
bypass canal and bypasses the heat transmission device 4. The paths
of the first canal 3 and of the second canal 6 can thus be derived
particularly well from the FIGS. 2a and 2c.
[0022] In regarding FIGS. 1 and 2a, it is recognisable that a
pivotable bypass flap 7 is provided that brings about a flow
division between the first canal 3 and the second canal 6. It goes
without saying that the bypass flap 7 represents merely one
possible embodiment, meaning that in this instance, generally
sliders, valves or similar such items can also be used. The
pivotable bypass flap 7 is pivotably mounted about an axis 8 and
has an adjustment lever 9 outside of the housing 2, said adjustment
lever being connected to the bypass flap 7 in a rotationally fixed
manner and furthermore by means of which the position of the bypass
flap 7 can be adjusted. In the situation represented according to
FIG. 2a, the bypass flap 7 is situated in a first extremal position
in which it blocks the second canal 6 and directs the entirety of
the gas flow flowing through the cooling system 1 exclusively
through the first canal 3. In a second extremal position, which is
represented with a broken line according to FIG. 2a, the bypass
flap 7 would completely block the first canal 3 in such a manner
that the entirety of the gas flow flowing through the cooling
system 1 is directed exclusively through the second canal 6. It
goes without saying that any intermediate position whatsoever is
also conceivable that would effect a distribution of the gas flow
flowing through the cooling system 1 to the first canal 3 and to
the second canal 6.
[0023] It can be seen in FIG. 1 that the housing 2 is configured as
having at least two parts and exhibits a first housing part 10a as
well as s second housing part 10b that is sealing connected to said
first housing part. In an advantageous embodiment of the solution
according to the invention, cooling contours 11, in particular
cooling ribs, are configured on at least one of the two housing
parts 10a, 10b in such a manner that said cooling contours protrude
into the first canal 3, preferably perpendicular to the direction
of flow, and thereby force a redirection of the gas flow. In the
embodiment represented according to FIGS. 1 and 2, cooling contours
11 are configured on both housing parts 10a, 10b and engage with
one another in the assembled housing 2, as can particularly be seen
according to FIG. 2c. The cooling contours 11 represented in the
sectional view according to FIG. 2c are configured as solid,
wherein it is also conceivable that the cooling contours 11 are
configured to be hollow at least in part and flowed through by a
cooling fluid, in particular from housing part 10a to housing part
10b or the converse. In particular, the cooling contours 11 can
exhibit a blind hole by means of which an active cooling of the
cooling contours 11 is effected and furthermore by means of which
the cooling effect of the cooling system 1 is additionally
improved.
[0024] The housing 2 is configured as a die-cast metal housing,
wherein light metals, aluminium and alloys thereof in particular,
can be used. It goes without saying that zinc or magnesium die-cast
housings are also conceivable. By adding different metals to
aluminium, properties that are similar to steel can be generated,
while the high degree of heat conductivity that is an attribute of
aluminium, continues to remain. The connection of the both of the
housing parts 10a and 10b customarily is effected in a
pressure-sealed manner, for example by means of a welding process.
The selection of the die-cast metal as a material for the housing 2
is one that does not react unfavourably to the high temperatures
that arise in the exhaust gas and that furthermore thereby exhibits
a high degree of service performance. In using light metals for the
material of the housing 2, weight can moreover be reduced, which
increasingly becomes the aim with modern motor vehicles in
particular owing to the continually increasing costs of power
fuel.
[0025] With the cooling system 1 according to the invention, it is
thus possible to form both of the cooling canals 3 and 6
exclusively by means of integral moulding with housing contours 5,
5' connected to the housing 2 in such a manner that additional
separating elements, which are both too costly and too complicated
to assemble, can be dispensed with. Such a housing 2 or such
housing parts 10a and 10b can be manufactured with almost any
geometry whatsoever by means of a corresponding configuration of
the pressure die casting mould and can furthermore be manufactured
in a cost-effective manner.
[0026] Purely for the purpose of completeness, an exhaust gas
recirculation valve 12 is shown that is integrated in the cooling
system 1 or is at least cooled by a cooling jacket or directly with
coolant.
[0027] The housing part 10a and/or 10b can additionally be provided
with upper and/or lower closure head 13, which is configured out of
plastic in particular, in which additional components, which are
not shown, such as a thermostat valve, can be integrated or
installed therein. The closure head(s) 13 can be screwed to the
corresponding housing parts by means of screws 14.
* * * * *