DE102012020618B3 - Arrangement of a coolant pump - Google Patents

Abstract

The invention is based on the object of developing a novel arrangement of a coolant pump for internal combustion engines which is simple and robust, is easy to manufacture in terms of production technology, enables a considerably easier accessibility of the coolant pump in the engine compartment, and which, with uniform working parameters, also has a uniform design for different engine platforms ( Universal pump), while at the same time minimizing wear on the components and minimizing working noise, enables the pump functions to be diagnosed, reduces the weight of the coolant pumps and significantly reduces the manufacturing costs of the coolant pumps, and enables the pump functions to be electrified with minimal additional effort. The arrangement of a coolant pump according to the invention is characterized, among other things, by the fact that the bearing housing (2) of the coolant pump (1) is arranged inside the oil pan (10) on the crankcase (9), and one in the bearing housing (2) next to the coolant pump (1) Oil pump (11) is arranged, the drive shaft (3) of the coolant pump (1) also being the drive shaft (3) of the oil pump (11), the drive shaft (3) on the drive side next to the impeller (7) of the coolant pump (1 ) a pump shaft seal (8) and oil pump side in the bearing housing (2), in addition to the pump shaft seal (8) of the coolant pump (1) a leakage collecting chamber (12) with a leakage hole (13) is arranged, with an oil pump side next to the leakage collecting chamber (12) a shaft seal ( 14) and a leakage pump (15) is arranged in the leakage collecting space (12) on the drive shaft (3). The invention relates to the arrangement of a coolant pump (1) for internal combustion engines with a drive shaft (3) rotatably mounted in a bearing housing (2), one on the flow-side end of the drive shaft (3) in one with a suction opening (4) and an outflow opening (5 ) provided working chamber (6) arranged impeller (7), with an oil pump (11) arranged within an oil pan (10) on the crankcase (9).

Description

The invention relates to the arrangement of a coolant pump for internal combustion engines, for example in motor vehicles, such as passenger cars or trucks with a pump shaft and a rotatably mounted on the free, flow-side ends of this pump shaft arranged impeller.

In the prior art, different designs of water / coolant pumps are described above. All these designs have in common that these water / coolant pumps are arranged separately on the motor housing such that their end opposite the impeller end of the pump shaft projects beyond the motor housing. At this the motor housing superior free end pulleys are then arranged, via which then the impeller of the coolant pump by means of wedge, poly-V or timing belt is coupled directly to the crankshaft of the engine.

These arranged on the engine housing, driven directly from the crankshaft of the engine via a pulley water / coolant pumps are divided into two main groups, d. H. in the non-controllable coolant pumps, these are the coolant pumps in which the volume flow depends directly on the speed of the pump shaft, and in the controllable coolant pumps, these are the coolant pumps where the volume flow of the impeller next to the speed of the pump shaft in addition by mechanical, pneumatic or electrically operated components, such as by means of a flow opening of the pump impeller variable overlapping valve spool / control slide can be varied.

Although the controllable water / coolant pumps make it possible to reduce the delivery volume flow dependent on the pump shaft speed alone as required, and thereby save drive energy, the coolant circulation also comes to a standstill when the engine is stopped.

Therefore, electric motor-driven coolant pumps are described in the prior art. In these, the speed of the impeller is determined by the speed of a directly coupled to the impeller electric motor. These exclusively electric motor-driven designs of coolant pumps have the advantage that even in the summer traffic jam, even with the engine off, an optimal, needs-based coolant circulation can always be guaranteed.

The disadvantage of this exclusively electric motor driven coolant pumps is, in addition to the high energy demand, especially in comparison to the pulley but quite large volume of construction, which is required for the respective electric motor drive.

Since these required for the installation of electric motor drives clearances on the engine block, in the newer engine generations, but limited, also coolant pumps have been developed in which the pump shaft, in addition to the pulley, in conjunction with the arrangement of overrunning couplings on the pump shaft, if necessary , z. B. in the summer traffic jam, even when the internal combustion engine, depending on demand can be operated by electric motor.

All of the above designs, however, have in common that maintenance work on the coolant pumps always require a high installation and disassembly effort, since especially in connection with the newer generations of engines, the accessibility in the engine compartment of motor vehicles, such. B. to remove the water pump is very bad.

In addition, efficiency losses occur in the direct drive of the water / coolant pumps via poly-V belt drives, which are attributable to the flexing work losses in "V-belts".

The crankshaft of the internal combustion engine drives, in addition to the pulley of the pump shaft of the coolant pump arranged on the engine block, also the drive shaft of the oil pump, usually via a gear set or a chain drive. The oil pump is arranged in the region of the oil pan of the engine, and the drive shaft mostly sliding.

The spatially separated arrangement of the coolant pump outside the oil pan is absolutely necessary because despite the use of shaft seals in the pump / or. Drive shafts, both in the oil pumps, as well as in the coolant pumps, especially in prolonged use, the occurrence of leaks can not be excluded.

In the case of oil pumps arranged in the oil sump, this situation is relatively uncritical, with the exception of possibly occurring power losses.

But also for the outside of the engine block arranged coolant pumps solutions have been developed by means of which the coolant leaks z. B. are collected in small reservoirs on the motor housing, and then evaporate during the heating of the engine block, so that even under a parked in a garage car (despite minor leaks) can accumulate no leakage liquid droplets on the garage floor.

This spatially separate arrangement of the coolant pump "far away" of the oil pump so casually ensures that no coolant leaks can get into the lubricant (oil) and this could be contaminated.

Since the leakages of the vacuum pumps, in contrast to those of the coolant pumps do not affect the lubricant, it is also common in the prior art, if necessary, to mount the vacuum pump on the drive shaft of the oil pump directly next to this.

sThe assembly of the vacuum pump in the oil pan of the engine is also very advantageous for reasons of noise minimization.

The disadvantages of the current state of the art are, among other things, in addition to the Walkarbeitsverlusten with the resulting efficiency losses due to the poly-V belt drive of the coolant pump, the low installation space for the coolant pump in the engine compartment, which among other things also means that even with uniform operating parameters, as with similar delivery pressure and similar delivery volume, yet made for reasons of space in the installation space for each engine platform own coolant pump design and this then of course also in the workshops for necessary maintenance work must be provided. Another disadvantage is the poor accessibility of the coolant pump in the engine compartment and the associated high disassembly / assembly costs to ever even get to the coolant pump, and after the repair of the coolant pump, the high additional assembly costs for the "degraded modules to the vehicle then to restore it to a ready state.

In the prior art are also from the DE 692 12 118 T2 , of the DE 20 2004 015 033 U1 , of the DE 198 15 384 A1 and the DE 10 2008 051 129 A1 Pump designs are known in which two separate pumps are arranged axially one behind the other, and both pumps are driven by a common drive shaft.

All the aforementioned solutions are also common that they are intended for use in conjunction with internal combustion engines, motor vehicle engines.

The design after the DE 692 12 118 T2 , as well as the design after the DE 20 2004 015 033 U1 are arranged in the area of the engine block, outside the oil sump.

In the design after the DE 198 15 384 A1 the oil pump is arranged in the oil pan, however, so that their, driven by the crankshaft via a arranged in the oil pan sprocket drive shaft is mounted in the wall of the oil pan, wherein arranged on the drive shaft in this storage area, ie directly to the oil pan a coupling flange is, with which an associated coupling piece on the pump shaft of a pump disposed outside of the oil pan coolant pump rotatably in operative connection occurs.

The in the DE 10 2008 051 129 A1 schematically presented design provides that an oil pump and a coolant pump rotatably coupled to each other, and are arranged in the oil pan of an internal combustion engine.

In this case, the housing of a leakage collecting device is arranged with a leakage collecting container between two pump housings, which receives both the emerging from the coolant pump coolant leakage, as well as emerging from the oil pump oil leakage.

At the leakage collecting device, a drainage channel and / or a ventilation channel is arranged, via which the pump channels of the coolant pump are vented in addition to the leakage container.

The contents of the leak collection container is emptied either via the arranged on the leakage collecting device drain channel, the oil change, or can be sucked in the absence of a drain channel on the arranged on the leakage collecting ventilation duct by means of negative pressure.

The object of the invention is to develop a novel arrangement of a coolant pump for internal combustion engines, for example in motor vehicles, which does not have the aforementioned disadvantages of the prior art, is characterized in particular by a very high mechanical efficiency, simple and robust, manufacturing technology is simple can be produced, and also easy to assemble, the maintenance costs significantly reduced by a much easier accessibility of the coolant pump in the engine compartment, which also uniform for uniform engine parameters even designed for different engine platforms (universal pump), while the wear of the modules, as well as the working noise (eg squeak suppression of the water pump seal) minimizes the ability to diagnose the pump functions, also the weight of the coolant pumps, as well as the manufacturing cost of the coolant pump wesentli ch reduces high reliability, ensures a long service life and low susceptibility to soiling, and electrification of the pump functions with minimal additional effort Ensuring optimal cooling in the start-stop mode, as well as in the context of a hybridization (whether micro, mild or full hybrid) of the drive concept allows.

According to the invention this object is achieved by the inventive arrangement of a coolant pump for internal combustion engines according to the features of the main claim of the invention.

Advantageous embodiments, details and features of the invention will become apparent from the dependent claims, as well as from the following description of the three embodiments of the invention in conjunction with seven drawings to the different designs of the inventive solution.

The invention will now be explained in more detail with reference to three exemplary embodiments in conjunction with seven associated figures.

The 1 shows the bearing housing 2 with the inventive arrangement of a coolant pump 1 for combustion engines within the oil sump 10 in a horizontal section in the mounting plane on the crankcase 9 with an outside on the oil pan 10 arranged electric motor 26 , whose rotor shaft 27 through a shaft break 24 in the oil pan 10 via a shaft coupling 25 with the drive shaft 3 the coolant pump 1 can come into operative connection.

In the 2 is now in the 1 represented according to the invention within the oil pan 10 arranged coolant pump 1 for combustion engines on average at AA (acc 1 ) in the crankcase 9 shown attached state. In this, in the 1 shown, the design is the drive shaft 3 the coolant pump 1 also the drive shaft 3 the oil pump 11 , as well as the drive shaft 3 a vacuum pump 16 , In the coolant pump used in this embodiment 1 it is a controllable coolant pump, its volume flow by means of a control slide 41 , as described in the various patent rights in the prior art, can be varied according to demand. Of course, can also be used in conjunction with the solution according to the invention not controllable or controllable with other systems coolant pump.

The 3 now shows the detail X as shown in the 2 with the invention between the coolant pump 1 and the oil pump 11 on the drive shaft 3 arranged leakage pump 15 ,

The section through the leakage pump according to the invention 15 , ie the section BB after 3 , is in the 4 shown, and shows the leakage pump according to the invention 15 in the side view in partial section.

The 5 shows the detail Y from the 2 with the at the drive shaft 3 arranged positive shaft coupling 25 in the design of a curved tooth coupling.

The in the 1 to 5 illustrated arrangement of a coolant pump 1 for internal combustion engines with one in a bearing housing 2 rotatably mounted drive shaft 3 , one on the flow-side end of the drive shaft 3 in one with a suction port 4 and an outflow opening 5 provided working chamber 6 arranged impeller 7 one of the impeller 7 drive side on the drive shaft 3 adjacent in the bearing housing 2 arranged pump shaft seal 8th , with one on the crankcase 9 arranged oil pan 10 and one inside this sump 10 on the crankcase 9 arranged, driven by the crankshaft shaft of an oil pump 11 is characterized in particular by the fact that the bearing housing 2 the coolant pump 1 inside the oil pan 10 on the crankcase 9 is arranged, and that in the bearing housing 2 next to the coolant pump 1 an oil pump 11 is arranged, wherein the drive shaft 3 the coolant pump 1 at the same time also the drive shaft 3 the oil pump 11 is, and that on the drive shaft 3 on the drive side in the bearing housing 2 , next to the impeller 7 the coolant pump 1 a pump shaft seal 8th is arranged, with oil pump side in the bearing housing 2 , next to the pump shaft seal 8th the coolant pump 1 a leak collection room 12 with a leakage hole 13 is arranged, and oil pump side next to the leakage collecting space 12 a shaft seal 14 is arranged, and on the drive shaft 3 in the leakage collection room 12 a leakage pump 15 is arranged.

Through this leakage pump 15 in the first place, the inventive arrangement of a coolant pump 1 inside the oil pan 10 possible.

The inventively arranged leakage pump 15 generates both immediately adjacent to the pump shaft seal 8th the coolant pump 1 , as well as immediately adjacent to the oil pump side arranged shaft seal 14 in a special leak collection room 12 constantly a negative pressure and at the same time ensuring that all in the leak collection room 12 entering leaks, whether coolant 44 or oil 43 , as soon as possible via a leakage hole 13 from the area of the oil sump 10 be promoted. This arrangement according to the invention is characterized by a very high mechanical efficiency, is simple and robust, while manufacturing technology easy to produce, and also easy to install.

The much easier accessibility of the coolant pump 1 in the engine compartment, after removing the oil drain plug 48 and draining the oil 43 over the oil drain hole 47 by simply removing the oil pan 10 reached.

It is essential to the invention that in the lowest area of the coolant pump 1 a coolant drain hole 45 with a coolant drain hole 45 sealingly closing coolant drain plug 46 is arranged.

After removing the oil pan 10 can therefore now the cooling water drain plug 46 be opened. The coolant 44 can then, since the coolant drain plug 46 positioned at the lowest point, via coolant drainage hole 45 be completely drained.

After this complete Entlehrung can the coolant pump 1 then easily dismantled "dry".

The coolant pump assembly according to the invention thus offers the advantage of a simple and at the same time very comfortable assembly and disassembly which greatly reduces the maintenance effort.

With uniform working parameters (conveying volume delivery pressure, ...) can be defined via connection grid (bore patterns) on the crankcase 9 by means of the inventive solution for the first time even for different motor platforms uniformly designed (universal pumps) pump assemblies are used. At the same time, the arrangement according to the invention in its entirety ensures that the wear of the assemblies as well as the operating noise (eg squeaking suppression of the water pump seal) are minimized, so that a high level of reliability, a long service life and low susceptibility to soiling can always be ensured.

About, about the leakage hole 13 but at the same time a simple diagnostic capability of the pump functions is made possible. In addition, the arrangement according to the invention causes the weight of the coolant pumps to be reduced, but also the manufacturing costs of the coolant pumps, on the one hand by dispensing with a separate drive shaft 3 but also can be significantly reduced by the use of "universal pumps", whereby at the same time the logistical effort from the manufacture of the assembly to maintenance in the workshops can be significantly reduced. By arranging several pumps on a drive shaft 3 The electrification of all pump functions, ie ensuring optimum cooling in start-stop mode, but also electrification of all pump functions in the context of a hybridization (whether micro, mild or full hybrid) of the drive concept can be optimally ensured with minimal additional effort.

Essential to the invention in this context is also that, as in the 2 shown on the drive shaft 3 the coolant pump 1 next to the oil pump 11 also a vacuum pump 16 is arranged.

The arrangement of an oil pump 11 together with a vacuum pump 16 in the oil pan 10 an internal combustion engine is known, but the common arrangement of all three pumps on a common drive shaft 3 causes, again, a significant increase in the efficiency of the overall module.

Essential to the invention is that the bearing housing 2 by means of fixing holes 17 arranged fastening screws on the crankcase 9 is attached, and that the bearing housing 2 as well as the oppositely arranged crankcase 9 with inlet channels 18 and outlet channels 19 for those in the bearing housing 2 arranged pumps, such as the oil pump 11 , the vacuum pump 16 and / or the coolant pump 1 , as well as the leakage hole 13 for the leakage pump 15 is provided, wherein between the bearing housing 2 and the crankcase 9 a bearing housing gasket 20 , analogous to a cylinder head gasket, common to all intake ports 18 , all outlet channels 19 as well as the leakage hole 13 , is arranged.

But also according to the invention, as also in the 2 shown that the inlet channel 18 the coolant pump 1 from a impeller side on the bearing housing 2 arranged inlet nozzle 21 , which is separately next to the bearing housing 2 on the crankcase 9 is arranged is formed.

This significantly simplifies the manufacture of the bearing housing 2 and lowers not only the production costs but also the installation and maintenance costs and at the same time allows for a reduction in manufacturing tolerances and a simple and cost-effective tolerance compensation in the suction port 42 of the inlet nozzle 21 the coolant pump 1 ,

It is also advantageous in this context that, as also in the 2 presented to rotatable mounting of the drive shaft 3 in the bearing housing 2 bearings 22 are arranged.

Compared with rolling bearings, these plain bearings are significantly cheaper to manufacture but also much more robust, durable, vibration-damping, low-friction, and reliable in operational use. According to the invention is on the drive shaft 3 , inside the oil pan 10 , the impeller 7 opposite a drive wheel 23 , arranged in the design of a toothed or sprocket. This drive of the coolant pump has over the conventional drive in the art of coolant pumps with poly-V belt drives essential advantages, since not inevitable in these V-belt drives flexing does not occur, and only by the overall efficiency of the inventive design compared to those in the prior art known solutions increases.

It is also essential to the invention that with minimal additional effort the electrification of all pump functions, ie also ensuring optimal cooling in the start-stop mode, but also electrification of all pump functions in the context of hybridization (whether micro, mild or full hybrid) of the drive concept optimal thereby, as well as in the 2 can be ensured that in the oil pan 10 , next to the drive wheel 23 , in the area of the drive shaft 3 , a wave break 24 is arranged, and that in the area of the drive wheel 23 on the drive shaft 3 a positive shaft coupling 25 is arranged, and that outside on the oil pan 10 in the area of the shaft break 24 an electric motor 26 is arranged, whose rotor shaft 27 over the shaft coupling 25 with the drive shaft 3 in operative connection occurs, and that the drive wheel 23 with the drive shaft 3 about one in the direction of a higher speed of the drive shaft 3 "Freewheeling" overtaking freewheel 28 connected, and that also the rotor 29 the electric motor 26 by means of another, in the direction of a higher speed of the rotor shaft 27 "Freewheeling" overtaking freewheel 28 with the rotor shaft 27 connected is.

The arrangement of the two overrunning clutches shown in this context ensures simple and very cost-effective that the respectively faster drive, ie either mechanically via the drive wheel 23 , or electrically by means of the electric motor 26 always the drive of the drive shaft 3 takes over. Essential to the invention in this context is also that, as in the 2 shown, the positive shaft coupling 25 a plug-in coupling in the form of a curved tooth coupling is.

Such a gear couplings ensure within certain limits, ie even with not exactly aligned shafts, a tolerance compensation and allow despite the reduction of manufacturing costs (by larger tolerance fields) an accurate and reliable "floating" of the drive shaft 3 in the sliding bearing points, whereby a low-cost manufacturing with high reliability and long life with minimal friction losses can be ensured.

Essential to the invention is also that both between the pump shaft seal 8th the coolant pump 1 and the leak collection room 12 with the leakage pump 15 , as well as between the oil pump side arranged shaft seal 14 and the leak collection room 12 one stop disk each 30 is arranged, being between these two thrust washers 30 a rotationally fixed on the drive shaft 3 arranged rotary vane pump 31 as a leakage pump 15 revolves, by means of a rotating, spring-loaded slide 32 leaking fluid 33 from a crescent-shaped suction area 34 over the pressure range 35 the rotary vane pump 31 into the leakage hole 13 promotes.

It is characteristic that at that of the leakage pump 15 opposite free end of the leakage hole 13 a diagnostic unit 36 is arranged.

According to the invention are in the diagnostic unit 36 a leakage tank 37 with activated carbon filter, a pressure measuring sensor 38 , a panel 39 and a check valve 40 arranged.

Thus, the occurrence of "increased" leakage amounts, which indicate a malfunction of the shaft seals, an increasing dynamic pressure in front of the aperture 39 detected, and by the diagnostic unit 36 be evaluated. In contrast, the unavoidable leaks are inventively in the leakage container 37 arranged activated carbon filter cleaned and do not lead to an increase in pressure in front of the panel 39 ,

In addition, due to the inventive geodetic height difference between the coolant pump 1 and the expansion tank, on the sensors of the coolant pump 1 , a positive form, referring to the cavitation behavior of the coolant pump 1 has a favorable effect.

In the 6 is a modified design of the solution according to the invention just described, shown without a vacuum pump and with a coolant pump in a non-controllable design.

Of course, in the designs "without vacuum pump" in inventive arrangement of the coolant pump 1 inside the oil pan 10 the combustion engines also controllable Coolant pumps 1 , as for example by means of a control slide controllable coolant pumps 1 , Find employment.

However, all the assemblies according to the invention and their arrangement according to the invention shown in this second exemplary embodiment also result in the effects according to the invention explained in connection with the features according to the invention of the first exemplary embodiment (that is to say the connection with the abovementioned figures).

The 7 Now shows a further modification of the first embodiment (see 1 to 5 ). Compared to this first embodiment was in the in 7 illustrated design of the solution according to the invention to the additional drive by means of an outside of the oil pan 10 arranged electric motor 26 omitted, the rotor shaft 27 in the first embodiment via the shaft coupling 25 with the drive shaft 3 could enter into operative connection.

Also in this embodiment, one was by means of a control slide 41 adjustable coolant pump 1 used. Of course, in both embodiments, both controllable and non-controllable coolant pump according to the invention within the oil pan 10 to be ordered.

In addition, it should be noted that only two bearings are required by the inventive solution, and only thereby the overall solution works very low friction, in particular the oil lubrication of the two oil lubricated plain bearings is optimally ensured by the present invention "fitting" oil pump. The sliding bearings are also much more robust than the rolling bearings used in coolant pumps.

Also the common bearing housing 2 (All pumps are arranged in only one pump housing) leads in addition to the space savings at the same time to a significant reduction in weight, as well as to an associated saving of components such. As housing components, mounting flanges, shafts, bearings and the like.

Not least, the fact that due to the inventive solution when using an electric motor leads 26 and in "pure" electrical operation (ie only by means of the electric motor) for all pumps together only one electric motor is required, in addition to space, weight and cost savings, also to a significant reduction in manufacturing, assembly and maintenance costs, allows Cooling / heating function at engine standstill, and the reduction of bearing wear, since in the engine before the engine start electrically lubricating oil pressure can be provided, also by means of the electric drive with frequent start / stop operation by avoiding the mixed friction optimum supply of bearings guaranteed and so their life can be increased.

The solution according to the invention in conjunction with the use of an electric motor at the same time ensures a safety gain in the supply of the brake booster, but also at engine standstill a follow-up function of the pump to protect the turbocharger and the EGR components.

The combination of electric motor and "mechanical" drive also offers an additional safety redundancy.

In all designs of the solution according to the invention, it is possible to eliminate the disadvantages described in the prior art, and by the solution according to the invention an arrangement for coolant pumps 1 ready to provide, which is characterized by a very high mechanical efficiency, simple and robust, manufacturing technology is easy to manufacture, and also easy to install, the maintenance costs significantly reduced by a much easier accessibility of the coolant pump in the engine compartment, which also with uniform operating parameters themselves can be uniform for different motor platforms (universal pump), while at the same time minimizing the wear of the assemblies as well as the working noise (eg squeaking suppression of the water pump seal), a diagnostic capability of the pump functions, the weight of the coolant pumps, as well as the manufacturing cost of the coolant pumps substantially lowers, ensures high reliability, with a long service life and low susceptibility to soiling, and with minimal additional effort electrification of the pump functions to ensure optimal cooling in the start-stop mode, as well as in the context of a hybridization (whether micro, mild or even full hybrid) of the drive concept allows.

LIST OF REFERENCE NUMBERS

1

Coolant pump

2

bearing housing

3

drive shaft

4

suction

5

outflow

6

working chamber

7

impeller

8th

Pump shaft seal

9

crankcase

10

oil pan

11

oil pump

12

Leakage collection chamber

13

leakage hole

14

shaft seal

15

leakage pump

16

vacuum pump

17

mounting hole

18

inlet channel

19

exhaust port

20

Bearing housing gasket

21

inlet connection

22

bearings

23

drive wheel

24

Wave breakthrough

25

shaft coupling

26

electric motor

27

rotor shaft

28

overrunning clutch

29

rotor

30

thrust washer

31

Rotary vane pump

32

pusher

33

leaking fluid

34

suction area

35

pressure range

36

diagnostic unit

37

leakage container

38

Pressure measuring sensor

39

cover

40

check valve

41

regulating slide

42

suction

43

oil

44

coolant

45

Coolant drain hole

46

Coolant drain plug

47

Oil drain hole

48

Oil drain plug

Claims (12)

Arrangement of a coolant pump ( 1 ), in particular for internal combustion engines with one in a bearing housing ( 2 ) rotatably mounted drive shaft ( 3 ), one on the flow-side end of the drive shaft ( 3 ) in one with a suction port ( 4 ) and an outflow opening ( 5 ) provided working chamber ( 6 ) arranged impeller ( 7 ), one impeller ( 7 ) on the drive side on the drive shaft ( 3 ) adjacent in the bearing housing ( 2 ) arranged pump shaft seal ( 8th ), with one on a crankcase ( 9 ) arranged oil pan ( 10 ) and within this sump ( 10 ) on the crankcase ( 9 ) arranged bearing housing ( 2 ) with one in the bearing housing ( 2 ) rotatably mounted, driven by the crankshaft drive shaft ( 3 ) of an oil pump ( 11 ), in the bearing housing next to the oil pump ( 11 ) also the coolant pump ( 1 ) is arranged, and the drive shaft ( 3 ) of the oil pump ( 11 ) at the same time the drive shaft ( 3 ) of the coolant pump ( 1 ), with one between the coolant pump ( 1 ) and the oil pump ( 11 ), with a drainage channel for leakage fluid ( 33 ) provided leakage collection room ( 12 ), wherein on both sides of the leakage collecting space ( 12 ) on the drive shaft ( 3 ) Shaft seals are arranged, characterized in that on the drive shaft ( 3 ) in the leakage collection room ( 12 ) a leakage pump ( 15 ) is arranged, which the leakage liquid ( 33 ) in the as leakage hole ( 13 ) promotes trained drainage channel. Arrangement of a coolant pump ( 1 ) according to claim 1, characterized in that on the drive shaft ( 3 ) of the coolant pump ( 1 ) next to the oil pump ( 11 ) also a vacuum pump ( 16 ) is arranged. Arrangement of a coolant pump ( 1 ) according to claim 1 or 2, characterized in that - the bearing housing ( 2 ) by means of fastening bores ( 17 ) arranged fastening screws on the crankcase ( 9 ), and - that the bearing housing ( 2 ) as well as in each case opposite the crankcase ( 9 ) with inlet channels ( 18 ) and outlet channels ( 19 ) for in the bearing housing ( 2 ) arranged pumps, such as the oil pump ( 11 ), the vacuum pump ( 16 ) and / or the coolant pump ( 1 ), and also with the leakage hole ( 13 ) for the leakage pump ( 15 ), and - that between the bearing housing ( 2 ) and the crankcase ( 9 ) for all intake channels ( 18 ), Outlet channels ( 19 ) as well as the drainage channel, the leakage hole ( 13 ), a common bearing housing seal ( 20 ) is arranged. Arrangement of a coolant pump ( 1 ) according to claim 3, characterized in that the inlet channel ( 18 ) of the coolant pump ( 1 ) over an impeller side on the bearing housing ( 2 ) arranged inlet connection ( 21 ) separately next to the bearing housing ( 2 ) on the crankcase ( 9 ) is arranged. Arrangement of a coolant pump ( 1 ) according to one or more of claims 1 to 4, characterized in that for the rotatable mounting of the drive shaft ( 3 ) Bearings ( 22 ) in the bearing housing ( 2 ) are arranged. Arrangement of a coolant pump ( 1 ) according to one or more of claims 1 to 5, characterized in that on the drive shaft ( 3 ), inside the sump ( 10 ), the impeller ( 7 ) opposite a drive wheel ( 23 ), In the design of a toothed belt wheel, a toothed or sprocket wheel is arranged. Arrangement of a coolant pump ( 1 ) according to claim 6, characterized in that - in the oil sump ( 10 ), next to the drive wheel ( 23 ), in the area of the drive shaft ( 3 ), a shaft breakthrough ( 24 ), and - that in the area of the drive wheel ( 23 ) on the drive shaft ( 3 ) a positive shaft coupling ( 25 ), and - that on the outside of the oil sump ( 10 ) in the area of the shaft breakthrough ( 24 ) an electric motor ( 26 ) is arranged, the rotor shaft ( 27 ) via the shaft coupling ( 25 ) with the drive shaft ( 3 ), and - that the drive wheel ( 23 ) with the drive shaft ( 3 ) via one in the direction of a higher speed of the drive shaft ( 3 ) "Freewheeling" overrunning clutch ( 28 ), and - that also a rotor ( 29 ) of the electric motor ( 26 ) by means of a further, in the direction of a higher speed of the rotor shaft ( 27 ) "Freewheeling" overtaking freewheel ( 28 ) with the rotor shaft ( 27 ) connected is. Arrangement of a coolant pump ( 1 ) according to claim 7, characterized in that the positive shaft coupling ( 25 ) is a plug-in coupling in the form of a curved tooth coupling. Arrangement of a coolant pump ( 1 ) according to one or more of claims 1 to 8, characterized in that - oil pump side next to the leakage collecting space ( 12 ) a shaft seal ( 14 ), and - that both between the pump shaft seal ( 8th ) of the coolant pump ( 1 ) and the leakage collection room ( 12 ) with the leakage pump ( 15 ), as well as between the oil pump side arranged shaft seal ( 14 ) and the leakage collection room ( 12 ), with the leakage pump ( 15 ), one stop disk each ( 30 ), and - that between these two thrust washers ( 30 ) a rotationally fixed on the drive shaft ( 3 ) arranged rotary vane pump ( 31 ) as a leakage pump ( 15 ), which by means of a circumferential, spring-loaded slide ( 32 ) Leakage fluid ( 33 ) from a crescent-shaped suction area ( 34 ) over the pressure range ( 35 ) of the rotary vane pump ( 31 ) into the leakage hole ( 13 ) promotes. Arrangement of a coolant pump ( 1 ) according to one or more of claims 1 to 9, characterized in that on the of the leakage pump ( 15 ) opposite free end of the leakage bore ( 13 ) a diagnostic unit ( 36 ) is arranged. Arrangement of a coolant pump ( 1 ) according to claim 10, characterized in that in the diagnostic unit ( 36 ) a leakage container ( 37 ) with activated carbon filter, a pressure measuring sensor ( 38 ), an aperture ( 39 ) and a check valve ( 40 ) are arranged. Arrangement of a coolant pump ( 1 ) according to one or more of claims 1 to 11, characterized in that in a lowermost region of the coolant pump ( 1 ) a coolant drain hole ( 45 ) with a sealing this sealingly closing coolant drain plug ( 46 ) is arranged.

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