U.S. patent application number 16/349602 was filed with the patent office on 2019-11-14 for electric coolant pump.
The applicant listed for this patent is Mahle International GmbH. Invention is credited to Swen-Juri Bauer, Michael Baumann, Andreas Gruener, Andrea Teubner.
Application Number | 20190345868 16/349602 |
Document ID | / |
Family ID | 62026387 |
Filed Date | 2019-11-14 |
United States Patent
Application |
20190345868 |
Kind Code |
A1 |
Bauer; Swen-Juri ; et
al. |
November 14, 2019 |
ELECTRIC COOLANT PUMP
Abstract
An electric coolant pump may include at least one first coolant
inlet, at least one second coolant inlet, a coolant outlet, and a
valve device. The valve device may be configured to, based on a
selected operating point and a pressure in a coolant, at least one
of open and close at least one of the at least one first coolant
inlet and the at least one second coolant inlet. The valve device
may be integrated in a body of the coolant pump.
Inventors: |
Bauer; Swen-Juri;
(Stuttgart, DE) ; Baumann; Michael; (Ammerbuch,
DE) ; Gruener; Andreas; (Hattenhofen, DE) ;
Teubner; Andrea; (Rainau-Schwabsberg, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Mahle International GmbH |
Stuttgart |
|
DE |
|
|
Family ID: |
62026387 |
Appl. No.: |
16/349602 |
Filed: |
October 25, 2017 |
PCT Filed: |
October 25, 2017 |
PCT NO: |
PCT/EP2017/077268 |
371 Date: |
May 13, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F01P 7/164 20130101;
F04D 15/00 20130101; F01P 2007/146 20130101; F04D 15/0022 20130101;
F01P 2025/50 20130101; F01P 7/162 20130101; F01P 5/10 20130101;
F01P 7/14 20130101; F04D 15/0016 20130101; F01P 5/12 20130101; F01P
7/16 20130101; F01P 11/16 20130101; F01P 7/161 20130101; F01P
2005/125 20130101; F16K 31/1221 20130101 |
International
Class: |
F01P 5/12 20060101
F01P005/12; F01P 7/14 20060101 F01P007/14; F01P 7/16 20060101
F01P007/16 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 14, 2016 |
DE |
102016222307.0 |
Jan 19, 2017 |
DE |
102017200874.1 |
Claims
1. An electric coolant pump comprising: at least one first coolant
inlet, at least one second coolant inlet, and a coolant outlet; and
a valve device configured to, based on a selected operating point
and a pressure in a coolant, at least one of open and close at
least one of the at least one first coolant inlet and the at least
one second coolant inlet; wherein the valve device is integrated in
a body of the coolant pump.
2. The coolant pump as claimed in claim 1, wherein, in a first
operating point, the coolant pump is switched off and the at least
one first coolant inlet is open.
3. The coolant pump as claimed in claim 2, wherein: in a second
operating point, the coolant pump has a rotational speed at which
the at least one first coolant inlet is open and the at least one
second coolant inlet is closed; in a third operating point, the
coolant pump has a second rotational speed at which the at least
one first coolant inlet and the at least one second coolant inlet
are open; and in a fourth operating point, the coolant pump has a
third rotational speed at which the at least one first coolant
inlet is closed and the at least one second coolant inlet is
open.
4. The coolant pump as claimed in claim 3, wherein the valve device
includes a valve body, and wherein at least one of: in the first
operating point and the second operating point, the valve body is
arranged in a first position, in which the valve body blocks the at
least one second coolant inlet and uncovers the at least one first
coolant inlet; in the third operating point, the valve body is
arranged in a second position, in which the valve body uncovers the
at least one first coolant inlet and the at least one second
coolant inlet; and in the fourth operating point, the valve body is
arranged in a third position, in which the valve body blocks the at
least one first coolant inlet and uncovers the at least one second
coolant inlet.
5. The coolant pump as claimed in claim 1, wherein the valve device
is continuously adjustable based on a rotational speed of the
coolant pump.
6. The coolant pump as claimed in claim 4, wherein the valve body
is structured as a valve piston and is adjustable in a translatory
manner.
7. The coolant pump as claimed in claim 4, further comprising a
spring device prestressing the valve body in the first
position.
8. The coolant pump as claimed in claim 1, further comprising a
temperature sensor and a control device communicatively connected
thereto configured to control a power of the coolant pump based on
a temperature of the coolant.
9. A motor vehicle comprising an internal combustion engine, a
radiator, a heat exchanger, and a coolant pump, the coolant pump
including: at least one first coolant inlet, at least one second
coolant inlet, and a coolant outlet; and a valve device configured
to at least one of open and close at least one of the at least one
first coolant inlet and the at least one second coolant inlet based
on a selected operating point of the coolant pump and a pressure in
a coolant, the valve device integrated in a body of the coolant
pump; wherein the at least one first coolant inlet and the coolant
outlet are connected to the internal combustion engine, and the at
least one second coolant inlet is connected to the radiator.
10. The motor vehicle as claimed in claim 9, further comprising an
electric motor and an electrical energy accumulator, wherein the
coolant pump further includes at least one third coolant inlet
connected to at least one of the electric motor and the electrical
energy accumulator.
11. The motor vehicle as claimed in claim 10, wherein the at least
one third coolant inlet and the coolant outlet are connected to at
least one of the electric motor and the electrical energy
accumulator, and the at least one second coolant inlet is connected
to the radiator.
12. The motor vehicle as claimed in claim 9, further comprising a
temperature-regulated valve which is configured to, at a limit
temperature, open a bypass between the coolant outlet and the at
least one second coolant inlet.
13. The motor vehicle as claimed in claim 9, wherein: in a first
operating point of the coolant pump, the coolant pump is switched
off and the at least one first coolant inlet is open; in a second
operating point of the coolant pump, the coolant pump has a
rotational speed at which the at least one first coolant inlet is
open and the at least one second coolant inlet is closed; in a
third operating point of the coolant pump, the coolant pump has a
second rotational speed at which the at least one first coolant
inlet and the at least one second coolant inlet are open; and in a
fourth operating point of the coolant pump, the coolant pump has a
third rotational speed at which the at least one first coolant
inlet is closed and the at least one second coolant inlet is
open.
14. The motor vehicle as claimed in claim 13, wherein the valve
device includes a valve body, and wherein at least one of: in the
first operating point and the second operating point, the valve
body is arranged in a first position, in which the valve body
blocks the at least one second coolant inlet and uncovers the at
least one first coolant inlet; in the third operating point, the
valve body is arranged in a second position, in which the valve
body uncovers the at least one first coolant inlet and the at least
one second coolant inlet; and in the fourth operating point, the
valve body is arranged in a third position, in which the valve body
blocks the at least one first coolant inlet and uncovers the at
least one second coolant inlet.
15. The motor vehicle as claimed in claim 9, wherein the valve
device is continuously adjustable based on a rotational speed of
the coolant pump.
16. The motor vehicle as claimed in claim 14, wherein the valve
body is structured as a valve piston and is adjustable in a
translatory manner.
17. The motor vehicle as claimed in claim 14, further comprising a
spring device prestressing the valve body in the first
position.
18. The motor vehicle as claimed in claim 9, further comprising a
temperature sensor and a control device communicatively connected
thereto configured to control a power of the coolant pump based on
a temperature of the coolant.
19. An electric coolant pump comprising: a plurality of first
coolant inlets, a plurality of second coolant inlets, and a coolant
outlet; and a valve device configured to, based on a selected
operating point and a pressure in a coolant, at least one of open
and close at least one of i) at least one of the plurality of first
coolant inlets and ii) at least one of the plurality of second
coolant inlets; wherein the valve device is integrated in a body of
the coolant pump.
20. The coolant pump as claimed in claim 19, wherein: in a first
operating point, the coolant pump is switched off and at least one
of the plurality of first coolant inlets is open; in a second
operating point, the coolant pump has a rotational speed at which
at least one of the plurality of first coolant inlets is open and
at least one of the plurality of second coolant inlets is closed;
in a third operating point, the coolant pump has a second
rotational speed at which at least one of the plurality of first
coolant inlets and at least one of the plurality of second coolant
inlets are open; and in a fourth operating point, the coolant pump
has a third rotational speed at which at least one of the plurality
of first coolant inlets is closed and at least one of the plurality
of second coolant inlets is open.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority to International Patent
Application No. PCT/EP2017/077268 filed on Oct. 25, 2017, to German
Patent Application No. DE 10 2017 200 874.1 filed on Jan. 19, 2017,
and to German Patent Application No. DE 10 2016 222 307.0 filed on
Nov. 14, 2016, the contents of each of which are hereby
incorporated by reference in their entirety.
TECHNICAL FIELD
[0002] The present invention relates to an electric coolant pump
for delivering a coolant. The invention moreover relates to a motor
vehicle having an internal combustion engine and such a coolant
pump.
BACKGROUND
[0003] In modern motor vehicles, a coolant pump is usually used for
cooling an internal combustion engine, wherein the cooling power is
usually controlled via a thermostat valve. Such a thermostat valve
can open a bypass circumventing a radiator, for example when only a
low cooling power is required. Such a thermostat valve often
possesses an expansion element which enables comparatively simple
temperature-dependent control.
[0004] However, the coolant pumps known from the prior art are
disadvantageous in that they often run at constantly high power and
are controlled exclusively via a thermostat valve. A comparatively
high amount of energy is thus needed to operate the coolant pump. A
further and decisive disadvantage is that the known coolant pumps
and the thermostat valves arranged separately therefrom need a
comparatively large installation space.
[0005] The present invention is therefore concerned with the
problem of providing an improved or at least an alternative
embodiment for an electric coolant pump, which, in particular,
overcomes the disadvantages known from the prior art.
SUMMARY
[0006] According to the invention, this problem is solved by the
subject mater of the independent claim(s). Advantageous embodiments
are the subject matter of the dependent claims).
[0007] The present invention is based on the general idea of
integrating a valve device in a coolant pump and, at the same time,
no longer operating this expensively under a constantly high load
and therefore with a comparatively high amount of energy, but
instead providing a plurality of power stages in the manner of
operating points, wherein the valve device controls a coolant flow
depending on the selected operating point of the coolant pump and
the pressure generated by this in the process. The electric coolant
pump according to the invention serves in a known manner for
delivering a coolant, for example in the cooling circuit of an
internal combustion engine, and is adjustable between a plurality
of operating points. The electric coolant pump has at least one
first coolant inlet, at least one second coolant inlet and a
coolant outlet, as well as a valve device which is formed such
that, depending on the selected operating point of the coolant pump
and therefore the pressure p in the coolant, it opens or closes at
least one first or second coolant inlet or simultaneously opens at
least one first and second coolant inlet, wherein the valve device
is integrated in the coolant pump and thus optimally arranged in
terms of the installation space. In this case, it is particularly
advantageous that the coolant pump and the valve device form a
common unit or the valve device is integrated in the coolant pump.
In particular, a particularly compact design can thus be achieved,
which is highly advantageous in modern engine compartments and the
limited spatial conditions associated therewith. Moreover, such a
coolant pump can also be prefabricated externally and inserted into
the motor vehicle as a fully pre-assembled unit, thereby resulting
in assembly advantages.
[0008] In a further advantageous embodiment of the solution
according to the invention, in the first operating point, the
coolant pump is switched off and at least one first coolant inlet
is opened. In this case, the first operating point of the coolant
pump is therefore synonymous with an off state. In this case, the
first operating point is used in particular during a cold-start
phase of the internal combustion engine, in which additional
cooling of the internal combustion engine is not desired. A second
operating point provides a greater delivery power and thus
represents a comfort mode in which only an average cooling power of
the internal combustion engine is required, which can also be
achieved, for example, via a heat exchanger of an air-conditioning
system of a motor vehicle. The third operating point of the cooling
pump is represented by a cooling mode, for example, in which the
valve device is set such that the coolant flow circulates via a
radiator, the heat exchanger and the internal combustion engine. By
selecting the operating points, the amount of energy to be used for
this is considerably lower than in a coolant pump running
constantly under full load, in which, during a cold-start phase,
for example, the coolant flow is simply conducted past the radiator
by a valve formed as a bypass valve.
[0009] The valve device expediently has a valve body which, in the
first and second operating point, assumes a first position, in
which it blocks at least one second coolant inlet and uncovers at
least one first coolant inlet. In this case, the second coolant
inlet is connected to a radiator of the motor vehicle, whilst the
first coolant inlet is connected, for example, to the heat
exchanger of an air-conditioning system of the motor vehicle. In
the second operating point, and therefore in the first position of
the valve body, in which only an average cooling power is required,
the coolant flow is therefore not conducted via a radiator of the
motor vehicle. Additionally or alternatively, it can be provided
that the valve device has a valve body which, in the third
operating point, assumes a second position, in which it uncovers at
least one first coolant inlet and at least one second coolant
inlet. In the third operating point of the coolant pump, and
therefore in the second position of the valve body, this therefore
brings about a coolant flow which circulates via a vehicle
radiator, a heat exchanger and the internal combustion engine. In
this case, the valve body assumes the second position solely as a
result of the increased coolant pressure in the third operating
point. In the fourth operating point, the valve body assumes a
third position, in which it blocks at least one first coolant inlet
and uncovers a second coolant inlet.
[0010] In a further advantageous embodiment of the solution
according to the invention, a spring device is provided, which
prestresses the valve body in its first position. To adjust the
valve body between its first and second position, the coolant
pressure must therefore increase, which is usually only achieved if
the coolant pump is adjusted from its second operating point to its
third operating point. In this case, the coolant pressure p.sub.2,
p.sub.3 counteracts the pressure P.sub.F applied by the spring
device.
[0011] A temperature sensor and a control device communicatively
connected thereto are expediently provided for controlling the
operating points and therefore the power of the coolant pump
depending on the temperature of the coolant. To enable the
respective operating point of the coolant pump to be selected, it
is necessary to determine a cooling requirement, which is possible
via the temperature sensor provided according to the invention and
the control device communicatively connected thereto according to
the invention. Below a particular coolant temperature, for example
during a cold-start phase of the internal combustion engine,
cooling of the coolant and therefore cooling of the internal
combustion engine are not desired, so that, in this case, the
control device adjusts the coolant pump to its first operating
point, i.e. switches it off or allows it to be switched off, for
example. If the temperature of the coolant increases, the control
device can detect this via the temperature sensor and, according to
a characteristic map, for example, adjusts the coolant pump to its
second operating point, in which an average cooling power is
achieved. If the load on the internal combustion engine increases
significantly, for example when driving uphill, the temperature of
the coolant also increases, whereupon the control device adjusts
the coolant pump to its third operating point, in which the coolant
flow is conducted via the heat exchanger and the radiator and not,
as in the second operating point, exclusively via a heat exchanger
of an air-conditioning system of the motor vehicle, for example,
and thus generates a considerably higher cooling power for cooling
the internal combustion engine. If the load on the internal
combustion engine increases further, then the temperature of the
coolant also increases, whereupon the control device adjusts the
coolant pump to its fourth operating point, in which the coolant
flow is conducted exclusively via the radiator and not, as in the
third operating point, additionally via the heat exchanger of the
air-conditioning system of the motor vehicle. Therefore, a
temperature-dependent control of the operating points of the
coolant pump is also possible via the temperature sensor and the
control device communicatively connected thereto.
[0012] The present invention is further based on the general idea
of equipping a motor vehicle with an internal combustion engine, a
radiator, a heat exchanger, an air-conditioning system and a
coolant pump described above, wherein at least one first coolant
inlet and the coolant outlet are connected to the internal
combustion engine, whilst at least one second coolant inlet is
connected to the radiator. Such a motor vehicle according to the
invention requires considerably less electrical energy to operate
the coolant pump than is the case in the hitherto constantly
running coolant pumps. However, not only can electrical energy be
saved thereby, but also fuel.
[0013] Further important features and advantages of the invention
are revealed in the subclaims, in the drawings and in the
associated description of the figures with reference to the
drawings.
[0014] Or course, the features mentioned above and those still to
be explained below can be applied not only in the combination
described in each case but also in other combinations or in
isolation, without deviating from the scope of the present
invention.
[0015] Preferred exemplary embodiments of the invention are
illustrated in the drawings and will be explained in more detail in
the description below, wherein identical reference signs relate to
identical or similar or functionally identical components.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The drawings show, in each case schematically:
[0017] FIG. 1--shows a partly sectional coolant pump according to
the invention, having a valve device with a valve body located in
the first position,
[0018] FIG. 2--shows an illustration as in FIG. 1, but with the
valve body located in its third position,
[0019] FIG. 3--shows an exploded illustration of the coolant pump
according to the invention with a valve device,
[0020] FIG. 4--shows a schematic diagram of an installation
situation of the coolant pump according to the invention in a motor
vehicle according to the invention,
[0021] FIG. 5--shows an illustration as in FIG. 4, but with a third
coolant inlet in the coolant pump.
DETAILED DESCRIPTION
[0022] According to FIGS. 1 to 5, an electric coolant pump 1
according to the invention for delivering a coolant 2 has at least
one first coolant inlet 3, 3', at least one second coolant inlet 4,
4' and a coolant outlet 5. In this case, the coolant pump 1
according to the invention is adjustable between a plurality of
operating points, in particular between a first, a second, a third
and a fourth operating point. In addition, the coolant pump 1
according to the invention has a valve device 6, which is
integrated in the coolant pump 1 and which is formed such that,
depending on the selected operating point of the coolant pump 1 and
therefore the coolant pressure p, opens or closes the at least one
first or second coolant inlet 3, 3', 4, 4' or simultaneously opens
at least one first and second coolant inlet 3, 3', 4, 4'.
[0023] As can be seen in FIGS. 1, 2, and 4, the coolant pump 1
according to the invention and the valve device 6 form a common
unit 16 which, compared to hitherto used coolant pumps with
thermostat valves arranged separately therefrom, is considerably
compacter in design and thus offers considerable advantages in
terms of installation space.
[0024] In this case, a first operating point of the coolant pump 1
according to the invention has, for example, a delivery power of 0
l/min and a pressure p.sub.1 of 0 bar. In this state, i.e. in the
first operating point, delivery of coolant 2 through the coolant
pump 1 does not take place, so that this is switched off, for
example. A second operating point of the coolant pump 1 has, for
example, a delivery power of ca. 125 l/min and a pressure p.sub.2
of ca. 0.4 bar, whereas a third operating point has, for example, a
delivery power of ca. 220 l/min and a pressure p.sub.3 of ca. 1.4
bar.
[0025] The pressures in the respective operating points are
achieved by a corresponding rotational speed of the coolant pump 1,
so that, in the second operating point, the coolant pump 1 has a
rotational speed in which at least one first coolant inlet 3, 3' is
opened and at least one second coolant inlet 4, 4' is closed,
wherein, in the third operating point, the coolant pump 1 has a
rotational speed in which at least one first coolant inlet 3, 3'
and at least one second coolant inlet 4, 4' are opened, and
wherein, in a fourth operating point, the coolant pump 1 has a
rotational speed in which at least one first coolant inlet 3, 3' is
closed and at least one second coolant inlet 4, 4' is opened.
[0026] With regard to the construction of the valve device 6
according to the invention, reference is made below to FIGS. 1 to
3, from which it can be seen that the valve device 6 possesses a
valve body 7 which, in this case, is formed as an adjustable valve
piston 8 and which, in the first and second operating point,
assumes a first position (c.f. FIGS. 1 and 4), in which it blocks
at least one second coolant inlet 4, 4' and uncovers at least one
first coolant inlet 3, 3'. In the third operating point, on the
other hand, the valve body 7 assumes a second position, in which it
uncovers at least one first coolant inlet 3, 3' and at least one
second coolant inlet 4, 4'. In the fourth operating point, the
valve body 7 assumes a third position, in which it blocks at least
one first coolant inlet 3, 3' and uncovers a second coolant inlet
4, 4' (c.f. FIG. 2). Moreover, a spring device 9, for example a
simple helical spring, is provided, which prestresses the valve
body 7 in its first position, in which at least one second coolant
inlet 4, 4' is blocked. In this case, the spring device 9 exerts a
force on the valve body 7 which, in relation to the surface
thereof, corresponds to a pressure p.sub.F. A temperature sensor 10
and a control device 11 communicatively connected thereto can
likewise be provided for controlling the operating points of the
coolant pump 1 depending on the temperature of the coolant 2. In
this case, the valve device 6 is continuously adjustable depending
on the rotational speed of the coolant pump 1. In this case, it is,
of course, also alternatively conceivable that, instead of the
valve body 7 formed as a valve piston 8, the valve device 6
according to the invention can also have other valve bodies 7, so
that the valve device 6 can also be formed as a ball valve or as a
disk valve, for example.
[0027] The valve piston 8 illustrated according to FIG. 3 possesses
leakage openings 17 for pressure equalization.
[0028] Observation of FIG. 4 now shows a motor vehicle 12 having an
internal combustion engine 13, a radiator 14, a heat exchanger 15
in an air-conditioning system which is not otherwise illustrated,
and having a coolant pump 1 according to the passages above. In
this case, a first coolant inlet 3, 3' of the coolant pump 1, like
the coolant outlet 5, is connected to the internal combustion
engine 13, whilst a second coolant inlet 4, 4' is connected to the
radiator 14.
[0029] In this case, in terms of controlling a coolant flow 2, the
coolant pump 1 according to the invention functions as follows:
[0030] Cooling of the internal combustion engine 13 is not required
or desired upon a cold start thereof in order to accelerate the
heating of the internal combustion engine 13 and therefore achieve
a more rapid lowering of emissions. During this cold-start phase,
the coolant pump 1 is located in its first operating point, in
which it does not bring about a build-up of pressure and does not
deliver coolant 2 and is therefore switched off. If the temperature
of the coolant 2 increases, this is detected via the temperature
sensor 10, for example, which, in the present case according to
FIG. 1, is arranged in the region of the coolant pump 1, but can,
of course, additionally or alternatively also be positioned at
another point in the coolant system. If the temperature of the
coolant 2 reaches a certain value, the control device 11 connected
to the temperature sensor 10 adjusts the coolant pump 1 to its
second operating point, in which at least one second coolant inlet
4, 4' is still closed and a coolant flow circulates exclusively via
the internal combustion engine 13 and, for example, the heat
exchanger 15 of the air-conditioning system of the motor vehicle
12. Also, in this case, only moderate cooling of the internal
combustion engine 13 is required in this second operating point.
The pressure p.sub.2 of the coolant 2 generated in the second
operating point is lower than the pressure p.sub.F acting on the
valve body 7 by means of the spring device 9, so that the spring
device 9 prestresses the valve body 7 in its first position in
opposition to the coolant pressure p.sub.2.
[0031] If the temperature of the coolant 2 increases further, this
is likewise detected by the temperature sensor 10 and, upon
reaching a further limit value, results in the control device 11
adjusting the coolant pump 1 to its third operating point, in which
both the delivery power of the coolant pump 1 and also the pressure
p.sub.3 generated thereby in the coolant 2 increase significantly.
This results in the coolant pressure p.sub.3 being greater than the
pressure p.sub.F applied by the spring device 9 so that, in the
third operating point, the valve body 7 is adjusted to the right
according to FIG. 2, the spring device 9 is compressed and
simultaneously uncovers at least one second coolant inlet 4, 4',
whereby the coolant flow now circulates via the internal combustion
engine 13 and the radiator 14 and via the coolant pump 1 back to
the internal combustion engine 13. However, some of the coolant
flow 2 still flows via the heat exchanger 15. In this case, the
maximum cooling power is also produced in the fourth operating
point since the coolant pump 1 has a rotational speed in which at
least one first coolant inlet 3, 3' is closed and at least one
second coolant inlet 4, 4' is opened. In the fourth operating
point, the valve body 7 takes assumes its third position, in which
it blocks at least one first coolant inlet 3, 3' and uncovers a
second coolant inlet 4, 4' so that all of the coolant flow 2 flows
via the internal combustion engine 13 and the radiator 14.
[0032] Observation of FIG. 5 shows that the motor vehicle 12 has an
electric motor 18 and an electrical energy accumulator 19, wherein
at least one third coolant inlet 20 is connected to the electric
motor 18 and/or the electrical energy accumulator 19. In this case,
it is conceivable that the third coolant inlet 20 and the coolant
outlet 5 are connected to the electric motor 18 and/or the electric
accumulator 19 whilst a second coolant inlet 4, 4' is connected to
the radiator 14.
[0033] In FIG. 5, a temperature-regulated valve 21 is moreover
provided which, at a limit temperature, opens a bypass 22 between
the coolant outlet 5 and at least one second coolant inlet 4,
4'.
[0034] By means of the coolant pump 1 according to the invention
and the motor vehicle 12 according to the invention, it is for the
first time possible to form the coolant pump 1 and an associated
valve device 6 as an extremely compact unit 16, whereby
considerable advantages in terms of installation space can be
achieved.
* * * * *