DE102013016504A1 - Drive device for motor vehicle e.g. passenger car, has cooling space that is fluidically connected with lubricant circuit over lubricant passage for electric machine and lubricant passage within shaft of combustion engine - Google Patents

Abstract

The drive device (10) has a cooling space (22) which is fluidically connected to lubricant circuit which flows the lubricant for cooling an electric machine (16). The cooling space is fluidically connected with lubricant circuit over the lubricant passage (24) for electric machine and the lubricant passage (26) within a shaft (12) of combustion engine.

Description

The invention relates to a drive device for a motor vehicle, in particular a passenger car according to the preamble of patent claim 1.

Such a drive device for a motor vehicle is the DE 39 41 474 A1 to be known as known. The drive device comprises an internal combustion engine which has a lubricant circuit. The lubricant circuit can be flowed through by a lubricant. The lubricant serves for at least partial lubrication of the internal combustion engine. For example, the lubricant is used for lubricating a bearing point, on which a first component is movably mounted on a second component of the internal combustion engine relative to the second component. The lubricant is, for example, a lubricating fluid, in particular lubricating oil.

The drive device further comprises at least one electric machine. The electric machine has at least one cooling space. The cooling chamber is fluidly connected to the lubricant circuit of the internal combustion engine. As a result, the lubricant flows through the cooling space of the electric machine, so that the electric machine can be cooled at least in places by means of the lubricant. In other words, the internal combustion engine and the electric machine share the lubricant. As a result, the effort for lubricating the internal combustion engine and for cooling the electric machine can be kept low because, for example, a common conveyor for conveying the lubricant can be used. Respective conveying elements such as pumps can thus be avoided.

The DE 102 04 592 A1 discloses a drive unit for a motor vehicle, with at least one electric motor, and with at least one cooling device for the simultaneous liquid cooling of an electrical functional unit and of the electric motor. It is provided that the electrical functional unit at least partially surrounds the electric motor on its circumference.

Finally, out of the DE 198 10 437 A1 an electric machine, in particular for starting an internal combustion engine and / or for supplying power to an on-board voltage network of a motor vehicle. The electric machine comprises a starter mounted in a housing and a claw-pole rotor system mounted on a rotor, wherein the electric machine can be coupled to the internal combustion engine via a separable operative connection. It is provided that the starter and the rotor in separate, different cooling media having, cooling circuits are involved.

Object of the present invention is to provide a drive device for a motor vehicle of the type mentioned, in which the cooling chamber of the electric machine can be supplied in a simple, cost and space-saving manner with lubricant from the lubricant circuit of the internal combustion engine.

This object is achieved by a drive device having the features of patent claim 1. Advantageous embodiments with expedient and non-trivial developments of the invention are specified in the remaining claims.

In order to provide a drive device for a motor vehicle, in particular a passenger car, specified in the preamble of claim 1 species, in which the cooling space of the electric machine in a simple, cost and space favorable way with lubricant from the lubricant circuit of the internal combustion engine can be supplied, it is according to the invention provided that the cooling space is fluidly connected via at least one first lubricant channel of the electric machine with at least one within a shaft of the internal combustion engine and fluidly connected to the lubricant circuit second lubricant channel, wherein the cooling chamber via the second lubricant can be fed. In other words, the cooling space is fluidically connected to the first lubricant channel, wherein the first lubricant channel extends in the electric machine.

The first lubricant channel is fluidly connected to the second lubricant channel which extends within the shaft. The cooling space can thus be supplied with the lubricant from the lubricant circuit of the internal combustion engine via the first lubricant channel and the second lubricant channel. The lubricant from the lubricant channel of the internal combustion engine can be transferred to the first lubricant channel and thus the cooling space in a particularly space-saving way and particularly streamlined.

The fluidic connection of the lubricant channels with one another is to be understood in particular as meaning that an inflow opening of the first lubricant channel, via which lubricant can flow into the first lubricant channel, is arranged in at least partial overlap or overlap with an outflow opening of the second lubricant channel, wherein the lubricant flows via the Outflow opening from the second Lubricant channel can flow. As a result, the lubricant exiting via the outflow opening from the second lubricant channel can flow directly into or overflow via the inlet opening into the first lubricant channel, so that a defined and secure supply of the cooling space with the lubricant is ensured.

The lubricant is preferably a liquid, in particular a lubricating oil. As a result, on the one hand, the internal combustion engine can be lubricated efficiently and effectively. On the other hand, an efficient and effective cooling, in particular liquid cooling of the electrical machine can be represented. The lubricating fluid can absorb a particularly large amount of heat from the electric machine and carry away from it.

In particular, it is possible to use the cooling space to cool a stator and a rotor, which is movable relative to the stator, in particular rotatable, of the electric machine by means of the lubricant. In principle, part of the power loss at the stator and another part at the rotor fall on an electric machine. In this case, the cooling of the rotor is usually problematic because it moves relative to the stator. In the drive device according to the invention also an effective and efficient cooling of the rotor can be displayed.

The cooling of the electrical machine is advantageous because magnets, in particular permanent magnets, of the electric machine can demagnetize under excessive heat, so that the electric machine is no longer functional. Such excessive heating of the magnets can be avoided by means of the cooling. The magnets are arranged, for example, on the rotor, this being cooled by means of the cooling space and the lubricant.

Further advantages, features and details of the invention will become apparent from the following description of a preferred embodiment and from the drawing. The features and feature combinations mentioned above in the description as well as the features and feature combinations mentioned below in the description of the figures and / or in the figures alone can be used not only in the respectively specified combination but also in other combinations or in isolation, without the scope of To leave invention.

The drawing shows in:

1 a schematic sectional view of a drive device for a motor vehicle, with an internal combustion engine and an electric machine whose at least one cooling space is fluidly connected to a lubricant circuit of the internal combustion engine, wherein a first lubricant channel of the electric machine fluidly with a running within a shaft of the internal combustion engine, the second Lubricant channel is fluidically connected;

2 a section of another schematic sectional view of the drive device; and

3 a fragmentary schematic and perspective longitudinal view of the shaft of the internal combustion engine.

In the figures, identical or functionally identical elements are provided with the same reference numerals.

1 shows a detail of a whole with 10 Designated drive device for a motor vehicle, especially a passenger car. The drive device 10 serves to drive the motor vehicle.

The drive device 10 includes an internal combustion engine, which is designed as a reciprocating internal combustion engine. From the internal combustion engine is in 1 partially a shaft in the form of a crankshaft 12 recognizable. The internal combustion engine has at least one combustion chamber in the form of a cylinder. In the cylinder, a piston is received translationally movable relative to the cylinder. The piston is articulated via connecting rod with the crankshaft 12 connected, so that the translational movements of the piston in the cylinder in a rotational movement of the crankshaft 12 can be converted. The crankshaft 12 is doing an in 1 unrecognizable crankcase of the internal combustion engine rotatably mounted about an axis of rotation relative to the crankcase.

For storage of the crankshaft 12 a storage lane is provided, which includes several storage locations. These bearings are in the longitudinal direction of the crankshaft 12 arranged consecutively or one behind the other. At these bearings is the crankshaft 12 via respective shaft journals of the crankshaft 12 stored, with one of these journals 14 designated shaft journal of the crankshaft 12 in 1 is recognizable. The bearings where the crankshaft 12 is mounted on the crankcase are also referred to as main bearings or as a main bearing. The bearing of the crankshaft 12 on the crankcase, for example via respective bearing elements. These bearing elements may be rolling bearings with rolling elements or plain bearings, for example with plain bearing shells.

In order to keep the friction at the bearing points and resulting from the friction wear and heat generation low, the bearings are supplied with a lubricant in the form of lubricating oil. The lubricating oil is guided, for example, between at least two components, which are at a rotation of the crankshaft 12 relative to the crankcase and move relative to each other. As a result, the components are cooled and lubricated by means of the lubricating oil. These relatively movable components are, for example, on the one hand to the respective shaft journal (shaft journal 14 ) and on the other hand, the respective plain bearing shells. The internal combustion engine also has a lubricant circuit via which the bearings are supplied with the lubricant.

How out 1 and 2 can be seen includes the drive device 10 also an electric machine 16 , The electric machine 16 is operable as an electric motor, for example, in a motor operation. In engine operation, for example, the crankshaft 12 from the electric machine 16 drivable. The electric machine 16 can thus act in their engine operation as a so-called starter generator, by means of which the crankshaft 12 can be driven. As a result, the initially deactivated internal combustion engine can be activated, that is, started. The electric machine 16 is for example operated in a generator mode as a generator. In generator mode is the electric machine 16 for example, from the crankshaft 12 drivable. This can be done by means of the electric machine 16 In generator mode, mechanical energy is converted into electrical energy.

This electrical energy can be stored for example in an electrical storage device, in particular in a battery of the motor vehicle. By means of the electrical energy can at least one electrical load, such as the electric machine 16 in their engine operation, are supplied. As a result, a particularly efficient and thus fuel consumption and low-emission operation of the motor vehicle can be realized. The electric machine 16 is a so-called close-coupled electric machine 16 which is arranged in particularly close proximity to the internal combustion engine. For example, the electric machine 16 held on the crankcase.

The electric machine 16 includes a stator 18 as well as relative to the stator 18 rotatable rotor 20 , In engine operation is the crankshaft 12 over the rotor 20 drivable. In generator mode, the rotor 20 from the crankshaft 12 drivable. This means that the rotor 20 with the crankshaft 12 coupled or can be coupled. At the rotor 20 For example, magnets, in particular permanent magnets, are arranged.

The electric machine 16 also has at least one cooling space 22 on. As will be explained below, the refrigerator is 22 fluidly connected to the lubricant circuit of the internal combustion engine. This allows the lubricating oil from the lubricant circuit of the internal combustion engine in the refrigerator 22 pour in and the fridge 22 flow through. As a result of heat transfer from the electric machine 16 on the lubricating oil is the electric machine 16 at least partially cooled. In particular, the rotor can 20 be cooled, so that excessive heating and any resulting damage and / or impairment of the function of the magnets can be avoided.

As in 1 is illustrated by a directional arrow, is the refrigerator 22 the electric machine via at least a first lubricant channel 24 the electric machine 16 with at least one within the crankshaft 12 running and very good 3 recognizable second lubricant channel 26 fluidly connected, wherein the second lubricant channel 26 the crankshaft 12 is fluidly connected to the lubricant circuit of the internal combustion engine. This means that the second lubricant channel 26 Belongs to the lubricant circuit of the internal combustion engine and consequently of the lubricating oil, which is conveyed for example by means of at least one conveyor in the form of a pump through the lubricant circuit, is flowed through. Due to the fluidic connection of the lubricant channels 24 . 26 together, the lubricating oil from the second lubricant channel 26 in the first lubricant channel 24 overflow and thus the first lubricant channel 24 flow through. From the first lubricant channel 24 then the lubricant oil can enter the fridge 22 pour in and the fridge 22 flow through. As a result, the lubricant circuit of the internal combustion engine to the first lubricant channel 24 and the fridge 22 extended.

In other words, the electric machine 16 , especially her rotor 20 , to a component or a further consumer in the lubricant circuit of the internal combustion engine. In the flow direction of the lubricating oil through the lubricant circuit is the electric machine 16 while downstream of the internal combustion engine, in particular downstream of the bearings, arranged. Despite the pre-cooling of the electric machine 16 successful lubrication and cooling of the bearings a particularly efficient and effective liquid cooling of the electric machine 16 , in particular the rotor 20 , representable. Using the directional arrow in 1 is the feeder or the Inlet of the lubricating oil from the crankshaft 12 to the refrigerator 22 illustrated.

In 2 is shown a further directional arrow, by means of which the discharge or the flow of the lubricating oil from the refrigerator 22 back to the crankshaft 12 is illustrated. The fridge 22 is with at least a first return channel 28 the electric machine 16 fluidly connected. Via the return channel 28 is the lubricating oil from the refrigerator 22 dissipated. The return channel 28 is one of the first lubricant channel 24 different, additionally provided channel. The first lubricant channel 24 and the return channel 28 thereby run inside the electrical machine 16 ,

How out 2 Furthermore, it can be seen, the return channel 28 the electric machine 16 with at least one within the crankshaft 12 extending, second return channel 30 fluidly connected. That from the fridge 22 over the first return channel 28 discharged lubricating oil can thus from the first return channel 28 in the second return channel 30 overflow, leaving a closed lubricating oil circuit between the crankshaft 12 and the electric machine 16 , in particular the rotor 20 , is formed. By this fluidic connection of the lubricating oil circuit of the electric machine 16 With the lubricant circuit of the internal combustion engine, the pump for conveying the lubricating oil through the lubricant circuit of the internal combustion engine and for conveying the lubricating oil through the lubricating oil circuit of the electric machine 16 be used. This is a simple, cost, weight and space favorable cooling of the electric machine 16 realizable.

It is provided, for example, that an outflow opening of the first return channel 28 , via the first return channel 28 flowing lubricating oil from the first return channel 28 can flow, in at least partial overlap or overlap with an inflow opening of the second return channel 30 is arranged so that from the first return channel 28 via the outflow opening of the first return channel 28 escaping lubricating oil on the inflow of the second return channel 30 in the second return channel 30 can flow in. This is indicated by the directional arrow in 2 illustrated. The second lubricant channel 26 is designed for example as a tap hole. The first lubricant channel 24 is designed, for example, as a gutter. The first return channel 28 is designed, for example, as a gutter.

Preferably, it is provided that the lubricating oil circuit, that is, the supply of the cooling space 22 is switchable with the lubricating oil. For this purpose, for example, a valve element is provided, which between a supply of the cooling space 22 with the lubricating oil preventing closed position and at least one open the supply open position is adjustable. The valve element may be in the first lubricant channel 24 or at the second lubricant channel 26 be arranged and fluidly obstruct in the closed position and release in the open position. As a result, a needs-based cooling of the electric machine 16 realizable.

The second lubricant channel 26 is fluid with a particularly good looking 3 recognizable pressure oil chamber 32 connected. The pressure oil room 32 is a pressure chamber, which is in the crankshaft 12 is arranged. Above the pressure oil room 32 can the second lubricant channel 26 be supplied with the pressurized lubricating oil. Out 1 and 3 is another in the crankshaft 12 running lubricant channel 34 recognizable, which also fluidly with the pressure oil space 32 is connected and to provide the refrigerator 22 is used.

The lubricating oil is pumped by the pump under pressure and thereby first in the pressure oil chamber 32 brought. From the pressure oil room 32 The lubricating oil can then into the second lubricant channel 26 or in the lubricant channel 34 and from there into the refrigerator 22 stream.

The second return channel 30 is by a separate from the crankshaft 12 trained insert 36 limited or formed. The insert part 36 is in one within the crankshaft 12 arranged and designed, for example as a bore receiving space 38 arranged. By means of the insert part 36 is the second return channel 30 from the pressure oil room 32 fluidly isolated. How out 3 is recognizable, surrounds the pressure oil chamber 32 the insert part 36 outer circumference. By means of the insert part 36 is also one inside the crankshaft 12 arranged oil room 40 fluidic from the pressure oil space 32 separated. Here is a sealing element in the form of an O-ring 42 provided by means of which the insert part 36 against the crankshaft 12 is sealed, leaving the oil room 40 against the pressure oil room 32 is sealed. The O-ring 42 is in a groove 44 of the insert part 36 arranged. The insert part 36 has another groove 46 on, in which a in 3 not shown, further sealing element, for example in the form of an O-ring, can be arranged. By means of this O-ring, the insert part 36 also against the crankshaft 12 be sealed, so that an undesirable leakage of lubricating oil from the pressure oil chamber 32 can be avoided to the environment.

The lubricating oil which comes from the refrigerator 22 via the return channels 28 . 30 can be discharged from the second return channel 30 and about the unpressurized oil room 40 For example, be returned to the pump.

How out 1 and 3 can be seen, the crankshaft 12 one inside the crankshaft 12 extending lubricant channel 33 on. The lubricant channel 33 is with the pressure oil room 32 fluidly connected. About the lubricant channel 33 can lubricate oil from the bearing point to which the shaft journal 14 belongs, in the pressure oil room 32 be guided. The lubricant channel 33 on the one hand leads into the pressure oil room 32 and on the other hand to an outer peripheral side surface 35 of the shaft journal 14 , Thus, so lubricating oil on the lubricant channel 33 , the pressure oil room 32 and the second lubricant channel 26 from the bearing point to which the shaft journal 14 heard, branched off and to the first lubricant channel 24 be guided. The lubricant channel 33 thus serves as a lubricating oil inlet from the main bearing, to which the shaft journal 14 belongs.

By the basis of 1 to 3 described integration of the refrigerator 22 in the lubricant circuit of the internal combustion engine are to realize the cooling of the electric machine 16 no additional components, in particular no additional pumps required. The lubricating oil circuit of the electric machine 16 or the lubricant circuit as a whole is closed. This allows the range of electrical machine 16 stay dry and does not have to be encapsulated. In addition, the introduction of additional friction, for example by shaft seals, can be avoided.

LIST OF REFERENCE NUMBERS

10

driving means

12

crankshaft

14

shaft journal

16

electric machine

18

stator

20

rotor

22

refrigerator

24

first lubricant channel

26

second lubricant channel

28

first return channel

30

second return channel

32

Pressure oil chamber

33

lubricant channel

34

lubricant channel

35

outer peripheral side surface

36

insert

38

accommodation space

40

oil space

42

O-ring

44

groove

46

groove

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 3941474 A1 [0002]
• DE 10204592 A1 [0004]
• DE 19810437 A1 [0005]

Claims (5)

Drive device ( 10 ) for a motor vehicle, with an internal combustion engine which has a lubricant circuit through which a lubricant can be passed for at least partial lubrication of the internal combustion engine, and with at least one electric machine ( 16 ), which at least one cold room ( 22 ), which is fluidically connected to the lubricant circuit and for at least partially cooling the electric machine ( 16 ) through which the lubricant can flow, characterized in that the cooling space ( 22 ) via at least one first lubricant channel ( 24 ) of the electric machine ( 16 ) with at least one within a wave ( 12 ) of the internal combustion engine and fluidically connected to the lubricant circuit second lubricant channel ( 26 ) is fluidically connected, via which the cooling space ( 22 ) the lubricant can be supplied. Drive device ( 10 ) according to claim 1, characterized in that in the shaft ( 12 ) with the second lubricant channel ( 26 ) fluidly connected pressure chamber ( 32 ) is arranged, via which the second lubricant channel ( 26 ) can be supplied with the pressurized lubricant. Drive device ( 10 ) according to one of claims 1 or 2, characterized in that the cooling space ( 22 ) with at least one return channel ( 28 ) of the electric machine ( 16 ) is fluidly connected, via which the lubricant from the cold room ( 22 ) dischargeable. Drive device ( 10 ) according to claim 3, characterized in that the return channel ( 28 ) of the electric machine ( 16 ) with at least one within the shaft ( 12 ) extending second return channel ( 30 ) is fluidly connected for discharging the lubricant. Drive device ( 10 ) according to one of the preceding claims, characterized in that via the second lubricant channel ( 26 ) the lubricant from a bearing point where the shaft ( 12 ) is mounted on a corresponding component of the internal combustion engine, branched off and to the first lubricant channel ( 24 ) is feasible.

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