DE102014011997A1 - Powertrain for a motor vehicle, in particular a passenger car - Google Patents

Abstract

The invention relates to a drive train (10) for a motor vehicle, having an internal combustion engine (12) which has output shafts (18) on a driven side (38) of the internal combustion engine (12) for driving the motor vehicle from the internal combustion engine (12 ) and at least one electric machine (22) having a rotor (28) arranged coaxially with the output shaft (18), the electric machine (22) being disposed on a side (20) opposite the output side (20) ) of the internal combustion engine (12) is arranged

Description

The invention relates to a drive train for a motor vehicle, in particular a passenger car, according to the respective preamble of the independent claims.

Such a drive train is for example the DE 100 32 681 A1 as well as the DE 102 42 601 A1 to be known as known. Such a drive train for a motor vehicle, in particular a passenger car, has an internal combustion engine with an output shaft via which torques for driving the motor vehicle can be provided by the internal combustion engine on an output side of the internal combustion engine. The internal combustion engine is designed, for example, as a reciprocating internal combustion engine whose output shaft is a crankshaft. Furthermore, the drive train comprises at least one electric machine which has a rotor which is arranged coaxially with the crankshaft.

In addition, the reveal EP 1 321 646 A1 and the DE 102 19 695 A1 a drive train with an internal combustion engine and an electric machine. The internal combustion engine has an output shaft, which is rotatably mounted on a housing about an axis of rotation relative to the housing and at least partially disposed in the housing. In this case, the electric machine in the radial direction of the output shaft laterally next to the housing, that is arranged next to the internal combustion engine.

Object of the present invention is to develop a drive train of the type mentioned in such a way that a particularly simple and space-saving integration of the electric machine in the drive train can be realized.

This object is achieved by the independent claims. Advantageous embodiments with expedient developments of the invention are specified in the other claims.

In order to develop a drive train specified in the preamble of claim 1 type such that the electric machine can be integrated in a particularly simple and cost-effective manner in the drive train, it is inventively provided that the electric machine is disposed on one of the output side opposite side of the internal combustion engine , Preferably, it is provided that the electric machine, in particular the rotor of the electric machine, at least partially disposed on the output shaft. This means that the output shaft of the internal combustion engine is at least partially covered by the rotor in the radial direction to the outside, wherein it is preferably provided that the rotor is coupled directly to the output shaft or rotatably connected.

This first aspect of the invention is based on the finding that conventionally a torsion damper is required in order to damp vibrations, in particular torsional vibrations, of the output shaft designed, for example, as a crankshaft. Such a torsion damper is provided in particular when a Umschliegungstrieb such as a belt drive for driving ancillaries of the internal combustion engine is not provided. In order to realize a particularly good damping of the vibrations of the output shaft, the torsion damper is usually arranged on the opposite side of the output side. Due to the use of the additional torsional damper it comes to a high weight, a high number of parts and high costs of the internal combustion engine or the drive train as a whole.

The idea underlying the first aspect of the invention is now to use the electric machine, in particular its rotor, as a torsion damper, in that the electric machine, in particular its rotor, has a mass by means of which the output shaft can be damped particularly well. In addition, space can be created on the output side by the arrangement of the electric machine on the opposite side of the output side of the internal combustion engine, in order to realize a particularly advantageous accident behavior of the drive train can. It has been shown that it can be in the arranged on the output side space to a so-called Crashrelevanten space, which can be used for example in an accidental application of force to the motor vehicle for energy absorption and / or to a targeted movement of components of the motor vehicle permit. In addition, results from the described arrangement of the electric machine, a particularly advantageous possibility, a power electronics associated with the electric machine, which is electrically connected to the electric machine, space-saving arrangement.

Such power electronics has, for example, an inverter, by means of which a direct voltage, which is provided by the electric machine, can be converted into an alternating voltage or vice versa. Overall, it is possible to keep the number of parts and the cost of the powertrain low while implementing a Vibration damping of the output shaft, since the vibration damping of the output shaft, the electric machine and not an additionally provided torsional damper is used. In addition, it is possible by the described arrangement of the electric machine to integrate such an electric machine in existing drive trains with motor designs that were not originally designed to integrate an electric machine. As a result, new developments of drive trains can be avoided or kept particularly low in cost.

The arrangement of the electric machine on the opposite side of the output side, that is before the internal combustion engine, for example, be advantageous if no ancillary drive and / or no timing drive for driving at least one camshaft for actuating at least one gas exchange valve of the internal combustion engine is provided. However, if such a control drive is provided, then it is advantageous if the control drive is arranged on the output side, in particular in a control housing provided on the output side. Such a control drive is, for example, a belt drive such as a belt drive or chain drive, via which, for example, at least one camshaft for actuating the at least one gas exchange valve is driven by the output shaft. Alternatively, the timing drive may be a gear drive for driving the at least one camshaft.

The internal combustion engine has, for example, a housing, in particular a crankcase, wherein the output shaft designed, for example, as a crankshaft rotatably mounted on the housing about an axis of rotation relative to the housing and at least partially, in particular at least predominantly disposed in the housing. It has been found to be particularly advantageous if the electrical machine arranged outside the housing, in particular arranged outside the housing and attached directly to the housing is. As a result, the electric machine can be integrated into the drive train in a particularly simple and cost-effective manner and coupled to the internal combustion engine, in particular its output shaft. Furthermore, a particularly advantageous vibration damping of the output shaft can be realized.

Moreover, it is conceivable for the electric machine to be accommodated in the control housing, in which the control drive is also arranged, so that therefore the electric machine and the control drive, which is also referred to as valve control drive, are located in the same control housing. Here, the control drive is arranged on the opposite side of the output side, which is then referred to as the control side.

A second aspect of the invention relates to a drive train specified in the preamble of claim 5, wherein it is provided for realizing a particularly simple and space-saving integration of the electric machine in the drive train according to the invention, that the electric machine in a control housing in which a timing drive or valve timing drive is arranged for driving at least one camshaft for actuating at least one gas exchange valve of the internal combustion engine is arranged. Advantageous embodiments of the first aspect of the invention are to be regarded as advantageous embodiments of the second aspect of the invention and vice versa.

The second aspect of the invention is based on the finding that the electric machine is usually far away from the output shaft of the internal combustion engine. Then fasteners such as screws with a large extension, in particular length, and a high screw-in must be used to connect the electric machine sufficiently stable at least indirectly to the internal combustion engine, in particular to the output shaft. This leads to a high weight. At the same time, the driveline is susceptible to deflection because a bandage comprising at least the internal combustion engine and the electrical machine relatively far removed therefrom has a high length. This is particularly the case when the drive train comprises a transmission, in particular an automatic transmission, with a torque converter, wherein the torque converter is connected to the output shaft via the rotor of the electric machine.

Due to the described integration of the electric machine in the control housing, the electric machine in the axial direction of the output shaft and the electric machine particularly close to the internal combustion engine, in particular on the output shaft can be arranged so that, for example, for connecting the electric machine to the output shaft fastening means such For example, screws with only a very short length can be used. As a result, the respective weight of the fastening elements and thus of the drive train can be kept low overall. In other words, it is possible to mount the electric machine in and in particular to the control housing with only small and light screws. In addition, the axial length of said dressing can be kept low, so that the risk of excessive deflection of the bandage comprising at least the Internal combustion engine and electric machine can be kept low. In addition, the number of parts and the cost of the powertrain can be kept low. In addition, a particularly advantageous connection of the electrical machine with the power electronics can be realized.

Preferably, it is provided that a stator of the electric machine is attached to the control housing, wherein the stator comprises, for example, a stator and a stator core. The stator core is attached to the stator and serves, for example, to guide a magnetic field of the electric machine. Furthermore, it is preferably provided that the power electronics and a connection terminal are attached to the control housing, wherein preferably the electrical machine is electrically connected to the power electronics via the connection terminal. If the electric machine has, for example, a sensor system by means of which, for example, parameters characterizing the operation of the electrical machine can be detected, then it is preferably provided that the complete sensor system of the electric machine is also fastened to the control housing.

A third aspect of the invention relates to a drive train specified in the preamble of claim 6, wherein it is provided for realizing a particularly simple and space-saving integration of the electric machine in the drive train according to the invention that the internal combustion engine has a control housing in which a timing drive or valve timing drive is arranged for driving at least one camshaft for actuating at least one gas exchange valve of the internal combustion engine, wherein on the control housing at least one projecting from the control housing in the axial direction spacer member is provided, through which in the radial direction outwardly a receiving area is limited, in which the electric machine at least partially is included. It can be provided that the spacer elements is formed separately from the control housing and attached thereto, in particular in the axial direction, or is formed integrally with the control housing.

The spacer element is also referred to as a spacer, by means of which components which follow in the axial direction of the internal combustion engine are kept at a defined distance. As a result, a defined space can be created, in which the electric machine can be arranged. The spacer element is doing a double function, since the spacer element is used not only to create the space or to keep distance, but also as a housing element in which the electric machine is at least partially arranged.

In the case of the third aspect of the invention, provision can be made for the stator, in particular the stator carrier, to be held on the spacer element, and the stator core is held over the latter. Preferably, the complete sensor system of the electric machine is attached to the spacer element. Finally, it is preferably provided that the power electronics and the connection terminal are attached to the spacer element. In the second aspect and in the third aspect of the invention, for example, it is provided that the internal combustion engine has no accessory drive such as a belt drive. The described integration of the electric machine, it is possible to keep the axial extent, that is, the length of the drive train particularly low. Furthermore, a functional integration can be represented, since the control housing or the spacer element is used not only for receiving the control drive or for spacing, but also for receiving the electrical machine. As a result, the number of parts, the cost and weight of the drive train can be kept very low. Furthermore, it is possible to pre-assemble the electrical machine and / or the power electronics or components of the power electronics and thereby to create a module part, which can be delivered in the preassembled state, for example, to a production line and finally mounted in a simple, time-consuming and cost-effective manner.

Preferably, it is provided in the second and third aspect of the invention that the example designed as a chain drive control drive (valve timing drive) is arranged on the output side. This makes it possible, for example, to arrange the electric machine in a space-saving manner, axially between the internal combustion engine and a transmission such as an automatic transmission, in particular a torque converter of the automatic transmission. Furthermore, it is preferably provided that a sensor element, in particular in the form of a transmitter wheel for detecting the rotational position of the output shaft of the internal combustion engine, is integrated into the rotor of the electric machine. In the encoder wheel is preferably a 60-2-Kurbenwellengeberrad, by means of which the rotational position of the crank shaft designed as the output shaft is detectable about its axis of rotation. Since the rotor of the electric machine is preferably non-rotatably connected to the output shaft, the rotational position of the output shaft corresponds to the rotational position of the rotor.

A fourth aspect of the invention relates to a drive train specified in the preamble of claim 8, wherein it is provided for realizing a simple and space-saving integration of the electric machine in the drive train according to the invention, that the electric machine in the example designed as a crankcase housing, on the the output shaft of the internal combustion engine is mounted about an axis of rotation relative to the housing is arranged. The example designed as a crankcase housing of the internal combustion engine thus has a dual function, since the housing is used on the one hand for at least partially and preferably predominantly receiving and storing the example designed as a crankshaft output shaft, and for receiving or housing the electric machine.

By this integration of the electric machine in the housing or crankcase, for example, the already described to the second aspect of the invention advantages can be achieved that the axial length of said association comprising the internal combustion engine and electric machine can be kept low, so that the risk of excessive Deflection of this bandage can be kept very low. Further, for connecting the electric machine to the output shaft, in particular the crankshaft, the internal combustion engine particularly small or short and low-weight fasteners such as screws can be used, so that the cost, weight and number of parts of the drive train can be kept low.

Further, it is preferably provided in the fourth aspect of the invention that the control housing is disposed on the opposite side of the output side, thereby to provide, for example, space advantages in the region of a cylinder head of the example designed as a reciprocating internal combustion engine internal combustion engine. Further, it is preferably provided in the fourth aspect of the invention that the electric machine is arranged on the output side. In addition, the electric machine can be used in the fourth aspect of the invention to dampen vibrations of the output shaft. As a result, the use of an additionally provided torsion damper can be avoided. Moreover, it is possible in the fourth aspect of the invention to dispense with a control housing, so that the number of parts, the weight and the space requirement of the drive train can be kept particularly low.

In the second, third and fourth aspects, it is possible for the electric machine to be arranged on the output side or on the output side of the internal combustion engine opposite to the output side. If the control housing, for example, arranged on the opposite side of the output side, it is advantageous to arrange the electric machine on the output side and attach them, for example, directly to the housing or crankcase of the internal combustion engine.

Overall, it can be seen that the four aspects of the invention is based on the common idea of integrating the coaxial with the output shaft of the internal combustion engine in a simple and space-saving manner in the drive train and thereby to arrange the electric machine on the output side or on the opposite side of the output side , The arrangement of the electric machine on the output side opposite side is particularly advantageous when the control drive, in particular the control housing, is arranged on the output side, wherein an accessory drive is not provided or if an accessory drive is arranged on the output side or if the accessory drive only is arranged after the electric machine.

In the arrangement of the electric machine on the opposite side of the output side, it is preferably provided that the electric machine is mounted directly on the crankcase. Furthermore, it is possible to arrange the electric machine on the output side in and thereby on the control housing. This is particularly advantageous when the control housing is arranged on the output side, for example, no accessory drive is provided or if the accessory drive is arranged on the opposite side of the output side.

The electric machine may be formed, for example, as an asynchronous machine. Furthermore, it is possible for the electric machine to be designed as a PSM, that is to say as a permanently excited machine, in particular as a permanently excited synchronous machine.

As further particularly advantageous, it has been shown, when the electric machine and its associated power electronics form a structural unit, the power electronics is arranged for example on the electric machine. This structural unit can be pre-assembled and integrated as a pre-assembled modular component in the drive train easily and inexpensively.

Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments 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 and perspective longitudinal sectional view of a drive train according to a first embodiment for a motor vehicle, with an internal combustion engine and with an electric machine, which is arranged on a side opposite the output side of the internal combustion engine side;

2 a schematic longitudinal sectional view of the drive train according to the first embodiment;

3 a schematic exploded view of the drive train according to a second embodiment, wherein the electric machine is arranged in a control housing of the internal combustion engine;

4 1, a schematic longitudinal sectional view of the drive train according to the second embodiment;

5 a fragmentary schematic and perspective longitudinal sectional view of the drive train according to the second embodiment;

6 1, a schematic longitudinal sectional view of the drive train according to the second embodiment;

7 a fragmentary schematic longitudinal sectional view of the drive train according to the second embodiment;

8th a schematic longitudinal sectional view of the drive train according to a third embodiment, in which the electric machine is at least partially disposed in a spacer element;

9 a schematic and perspective longitudinal sectional view of the drive train according to a fourth embodiment, in which the electric machine is arranged in a crankcase designed as a housing of the internal combustion engine; and

10 a fragmentary longitudinal sectional view of the drive train according to the fourth embodiment.

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

1 shows a schematic and perspective longitudinal sectional view of a whole 10 designated drive train for a trained example as a passenger cars. The powertrain 10 includes a whole with 12 designated internal combustion engine, which is designed as a reciprocating internal combustion engine and is used to drive the motor vehicle. The internal combustion engine 12 includes a housing in the form of a crankcase 14 , which is designed for example as a cylinder crankcase. The crankcase 14 has a plurality of combustion chambers in the form of cylinders, of which in 1 two with 16 designated cylinders are recognizable. The cylinders 16 are arranged in a row one behind the other, so that the internal combustion engine 12 for example, is designed as a series motor.

In the cylinders 16 is one in each case 1 Not shown piston received translationally movable. The respective piston is in each case via a connecting rod with an output shaft in the form of a crankshaft 18 the internal combustion engine 12 articulated coupled. This articulated coupling allows the translational movements of the pistons in the cylinders 16 in a rotational movement of the crankshaft 18 being transformed.

Out 1 is recognizable that the crankshaft 18 on the crankcase 14 about an axis of rotation relative to the crankcase 14 rotatably mounted and thereby at least partially and present at least predominantly or completely in the crankcase 14 is included. During its train operation, the internal combustion engine 12 over her crankshaft 18 on one in 1 unrecognizable output side torques for driving the motor vehicle ready. In 1 is one of the output side in the axial direction of the crankshaft 18 opposite side 20 recognizable.

The internal combustion engine 12 can a in 1 Not shown cylinder head, which with the crankcase 14 connected is. At least one camshaft is rotatably mounted on the cylinder head about an axis of rotation relative to the cylinder head. The camshaft is used to actuate gas exchange valves, which are, for example, at the gas exchange valves Intake valves and / or exhaust valves is. The gas exchange valves serve to control the so-called gas exchange. In other words, the gas exchange valves serve to an influx of gas, in particular fresh air or a fuel-air mixture in the cylinder 16 and a discharge of exhaust gas from the cylinders 16 to control.

Usually, the internal combustion engine comprises 12 while a timing drive, which is also referred to as Ventilsteuertrieb. The control drive is used to drive the at least one camshaft and thus to control the gas exchange valves. About the timing drive is the at least one camshaft with the crankshaft 18 coupled so that the at least one camshaft via the control drive from the crankshaft 18 can be driven. The timing drive is designed for example as a belt drive, in particular as a chain or belt drive, or as a gear drive. The tax drive is, for example, on the in 1 unrecognizable output side arranged.

The powertrain 10 also includes an electric machine 22 , which is used for example as a starter generator (SG) or as an integrated starter generator (ISG). The electric machine 22 includes a housing in the form of a stator housing 24 as well as a whole with 26 designated stator, which may have windings. The windings are, for example, part of a stator core, which is used to guide a magnetic field of the electric machine 24 serves. The stator core is held, for example, on a stator, which in turn on the stator housing 24 can be attached.

In addition, the electric machine points 22 one in total with 28 designated rotor, which is about an axis of rotation relative to the stator 26 and relative to the stator housing 24 is rotatable. The rotor 28 includes, for example, a rotor carrier 30 and a rotor core 32 for guiding the magnetic field, wherein the rotor core 32 For example, designed as a laminated core and rotor arm 30 is held. Out 1 is particularly well recognizable that the rotor 28 coaxial to the crankshaft 18 (Output shaft) is arranged, so that is the axis of rotation of the crankshaft 18 with the axis of rotation of the rotor 28 coincides.

To now a particularly simple and space-saving integration of the electric machine 22 in the drive train 10 to realize is at an in 1 and 2 illustrated first embodiment of the drive train 10 provided that the electric machine 22 on the opposite side of the output side 20 is arranged. Here is the electric machine 22 outside the crankcase 14 arranged and directly on the crankcase 14 attached. How out 1 can be seen, is the stator case 24 directly on the crankcase 14 attached. In addition, the rotor 28 non-rotatable with the crankshaft 18 connected. These are rigid screwed 34 provided by means of which the rotor 28 directly and non-rotatably with the crankshaft 18 is coupled. This allows torques between the crankshaft 18 and the rotor 28 be transmitted. It is also in 1 a second storage 36 recognizable.

The electric machine 22 For example, it is operable in a motor mode in which it transmits torques via its rotor 28 provides. Due to the coupling between the rotor 28 and the crankshaft 18 can the torques from the rotor 28 on the crankshaft 18 be transmitted, so that during engine operation, the crankshaft 18 by means of the electric machine 22 is drivable. This makes it possible, for example, the initially deactivated internal combustion engine 12 by means of the electric machine 22 in their engine operation, that is to activate or start. Alternatively or additionally, a so-called boost function can be represented. As part of the boost function, the internal combustion engine 12 operated in their train operation, in which wheels of the motor vehicle by means of the internal combustion engine 12 are driven. In addition, as part of the boost function, the electric machine 22 operated in their engine operation, so that the electric machine 22 over her rotor 28 the crankshaft 18 drives. This means that the internal combustion engine 12 , in particular the crankshaft 18 , is supported in the context of the boost function when driving the wheels, so that, for example, the car can be accelerated particularly strong.

The electric machine 22 is also operable in a generator mode. In generator mode, the internal combustion engine 12 over her crankshaft 18 mechanical energy by means of which the rotor 28 is driven. By means of the rotor 28 the mechanical energy is converted into electrical energy during generator operation, wherein this electrical energy can be supplied to at least one electrical load and / or stored in a battery.

In the first embodiment, the electric machine will now be 22 in front of the internal combustion engine 12 that is on the opposite side of the output side 20 arranged and directly on the crankshaft 18 appropriate. The idea underlying this arrangement is that the electric machine 22 on the website 20 can simultaneously act as a torsion damper, so that a trained example as a belt drive Auxiliary drive and a torsion damper on the side 20 can be omitted.

Such an accessory drive is a drive for driving ancillaries of the internal combustion engine 12 , These ancillaries may be, for example, pumps. The accessory drive can be completely eliminated or arranged for example on the output side. In comparison to an arrangement of the electric machine 22 On the output side can be a better torsional damping of the crankshaft 18 by means of the electric machine 22 will be realized. In addition, the number of parts, the weight and the noise of the drive train 10 be kept low. In addition, additional space for the electric machine 22 created or used. In addition, an additional, cost and weight-intensive torsion damper is not provided and not required.

The arrangement of the electric machine 22 in front of the internal combustion engine 12 or on the side 20 and the direct connection of the electric machine 22 to the crankcase 14 and the crankshaft 18 go out very well 2 showing off the powertrain 10 according to the first embodiment in a schematic longitudinal sectional view shows. In 2 is the electric machine 22 illustrated particularly schematically as a block. 2 So shows the electric machine 22 , which as a unit in front of the internal combustion engine 12 or the crankcase 14 is arranged.

Based on 3 to 7 is a second embodiment of the powertrain 10 illustrated. For example in 3 is the internal combustion engine 12 with her crankcase 14 recognizable. Furthermore, in 3 the page 20 as well as the side 20 opposite and with 38 designated output side shown. Out 3 is also a control box 40 in the form of a control housing cover recognizable, for example, has an integrated spacer element, that is, a so-called spacer. In synopsis with 2 it can be seen that the rotor carrier 30 is designed as a so-called rotor bell, on which the formed as a laminated core rotor core 32 is attached.

The powertrain 10 further comprises a transmission in the form of an in 3 to 7 not shown automatic transmission, which is a in 4 partially recognizable gearbox housing 41 as well as a torque converter 42 having. The torque converter 42 has an input element rotatable about a rotation axis 44 on, with the input element 44 coaxial with the electric machine 22 or the rotor 28 and thus coaxial with the crankshaft 18 is arranged. This means that the respective axes of rotation of the crankshaft 18 , the rotor 28 and the input element 44 coincide. Torques generated by the internal combustion engine 12 over her crankshaft 18 and / or from the electric machine 22 over her rotor 28 be provided via the input element 44 in the torque converter 42 initiated or transmitted to this and the torque converter 42 introduced into the automatic transmission. This automatic transmission finally drives the wheels of the motor vehicle.

Especially good in 4 is recognizable that the torque converter 42 , in particular the input element 44 , with the rotor 28 , in particular the rotor carrier 30 , rotatably coupled. For this purpose, fittings are provided, of which in 4 one with 46 designated screw is recognizable. In other words, the input element 44 with the rotor carrier 30 screwed.

Out 3 and 4 is beyond a connecting element in the form of a so-called flexplate 48 recognizable. The input element 44 is about the flexplate 48 with the rotor carrier 30 coupled. The flexplate 48 is an elastically deformable compensating element, by means of which axial and radial relative movements between the input element 44 and the rotor carrier 30 can be compensated. In addition, in 3 a detection element in the form of a donor wheel 50 recognizable, which is designed as a 60-2-Drehzahlgeberrad. By means of the encoder wheel 50 can rotate the crankshaft 18 and thus the rotor 28 be detected about the respective axis of rotation, so that by means of the encoder wheel 50 the respective speed of the crankshaft 18 and the rotor 28 can be detected.

The control housing 40 serves to record the previously described control drive. In other words, the timing drive is in the control housing 40 added. Moreover, in the second embodiment, it is also provided that the electric machine 22 in the control housing 40 is included. Here are the timing drive and thus the control housing 40 as well as the electric machine 22 on the output side 38 arranged.

Especially good 5 it can be seen that it can also be provided in the second embodiment that the electric machine 22 or her rotor 28 over the rotor carrier 30 directly with the crankshaft 18 can be connected rotatably.

Thus, the coupling of the input element takes place 44 with the crankshaft 18 over the flexplate 48 and the rotor 28 , in particular the rotor carrier 30 ,

6 shows the electric machine 22 , which as a unit in the control housing 40 is installed. The electric machine 22 is thus in the axial direction between the internal combustion engine 12 and the automatic transmission mounted. The second embodiment is based on the idea that the electric machine 22 not in a separate from the crankcase 14 and separately from the control box 40 trained ring is mounted, but the electric machine 22 is in the back, that is on the output side 38 arranged control housing 40 integrated. This allows a particularly high rigidity of a bandage comprising the internal combustion engine 12 and the automatic transmission as well as the electric machine 22 will be realized. As a result of this very high rigidity, there is no or very little noise during operation of the drive train 10 , so that this has a particularly advantageous noise behavior. Furthermore, it is possible to use the electric machine 22 connect with only short screws, so that the weight and the costs can be kept low. In addition, the number of parts of the drive train 10 be kept particularly low. Furthermore, a particularly high density of the drive train can be 10 realize.

7 shows the second embodiment in a further schematic longitudinal sectional view. By a double arrow 52 are in 7 Bending loads of the drive train 10 illustrated. As for the connection of the electric machine 22 very short screws can be used, it comes to very little screw forces, causing excessive deflections and excessive loads on the drive train 10 can be prevented.

8th shows the drive train 10 according to a third embodiment. In the third embodiment, the control housing 40 provided, for example, on the crankcase 14 , in particular directly, is attached. In addition, on the control box 40 at least one from the control box 40 in the axial direction, in this case in the direction of the automatic transmission or the transmission housing 41 , protruding spacer element 54 provided, wherein the spacer element 54 is designed as a ring. By means of the spacer element 54 is a receiving area in the radial direction to the outside 56 limited, in which the electric machine 22 at least partially and in the present case at least predominantly included. In other words, in the third embodiment, it is provided that the electric machine 22 at least partially in the spacer element 54 , which is also referred to as a spacer, is arranged. Here is the spacer element 54 separate from the crankcase 14 , separate from the control box 40 and separately from the gearbox 41 trained and the control box 40 attached.

In 8th is a dividing line 58 recognizable, along which the spacer element 54 on the steering box 40 supported or connected to this. In other words, the spacer element 54 along the dividing line 58 from the control box 40 be dismantled. This, by the dividing line 58 illustrated separation between the control housing 40 and the spacer element 54 that is, the respective axial extension of the control housing 40 and the spacer element 54 is variable, so the electric machine 22 in the spacer element 54 can be pre-assembled. In other words, for example, the electric machine 22 independent of the control housing 40 in the spacer element 54 and be attached to this, so that the spacer element 54 and the electric machine 22 form a pre-assembled module part. This module part can be preassembled and delivered in the preassembled state, for example, to an assembly line and finally time and cost in the drive train 10 to get integrated.

9 and 10 show a fourth embodiment of the drive train. In this fourth embodiment it is provided that the electric machine 22 in the internal combustion engine 12 is integrated. This means that the electric machine 22 in the crankcase 14 is arranged or recorded. Here is the electric machine 22 on the output side 38 arranged and therefore between the crankshaft 18 and the automatic transmission or the torque converter 42 arranged.

10 shows the electric machine 22 , which as a unit in the internal combustion engine 12 or the crankcase 14 is installed. Also in the fourth embodiment is at least a rigid screw as in the second embodiment and in the third embodiment 46 the electric machine 22 , especially their rotor 28 , with the input element 44 intended. The idea underlying the fourth embodiment is that the electric machine 22 not in a separate from the crankcase 14 trained housing element such as the control housing 40 or the spacer element 54 but in the crankcase 14 is arranged. So here is a room of the electric machine 22 directly to the crankcase 14 connected. Through such integration allows a particularly high stiffness of the bandage comprising the internal combustion engine 12 , the electric machine 22 and realize the automatic transmission. This results in a particularly advantageous noise behavior of the drive train 10 , In addition, a particularly simple cooling of the electric machine can be 22 For example, realize such that the electric machine 22 via a high-temperature cooling circuit of the internal combustion engine 12 is cooled. This high-temperature cooling circuit can be traversed, for example, by a cooling medium in the form of a cooling liquid, which is also referred to as cooling water. In the fourth embodiment, the number of parts, the cost and the space requirement of the drive train can be 10 keep low. In addition, a particularly advantageous space for accommodating the electrical machine is available.

LIST OF REFERENCE NUMBERS

10

powertrain

12

Internal combustion engine

14

crankcase

16

cylinder

18

crankshaft

20

page

22

electric machine

24

stator

26

stator

28

rotor

30

rotorarm

32

rotor core

34

screwing

36

second storage

38

output side

40

control housing

41

gearbox

42

torque converter

44

input element

46

screw

48

flexplate

50

sensor wheel

52

double arrow

54

Spacer element

56

reception area

58

parting line

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 10032681 A1 [0002]
• DE 10242601 A1 [0002]
• EP 1321646 A1 [0003]
• DE 10219695 A1 [0003]

Claims (9)

Powertrain ( 10 ) for a motor vehicle, with an internal combustion engine ( 12 ), which has an output shaft ( 18 ), via which on a driven side ( 38 ) of the internal combustion engine ( 12 ) Torques for driving the motor vehicle of the internal combustion engine ( 12 ) and at least one electric machine ( 22 ), which has a rotor ( 28 ) which is coaxial with the output shaft ( 18 ), characterized in that the electric machine ( 22 ) on one of the output side ( 38 ) opposite side ( 20 ) of the internal combustion engine ( 12 ) is arranged. Powertrain ( 10 ) according to claim 1, characterized in that the electric machine ( 22 ), in particular the rotor ( 28 ) of the electric machine ( 22 ), at least partially on the output shaft ( 18 ) is arranged. Powertrain ( 10 ) according to one of claims 1 or 2, characterized in that the output shaft ( 18 ) on a housing ( 14 ), in particular a crankcase ( 14 ), the internal combustion engine ( 12 ) and at least partially in the housing ( 14 ), wherein the electric machine ( 22 ) outside the housing ( 14 ), in particular outside the housing ( 14 ) and directly to the housing ( 14 ) is attached. Powertrain ( 10 ) according to one of the preceding claims, characterized in that the electric machine ( 22 ) in a control housing ( 40 ) in which a control drive for driving at least one camshaft for actuating at least one gas exchange valve of the internal combustion engine ( 12 ) is arranged. Powertrain ( 10 ) for a motor vehicle, with an internal combustion engine ( 12 ), which has an output shaft ( 18 ), via which on a driven side ( 38 ) of the internal combustion engine ( 12 ) Torques for driving the motor vehicle of the internal combustion engine ( 12 ) and at least one electric machine ( 22 ), which has a rotor ( 28 ) which is coaxial with the output shaft ( 18 ), characterized in that the electric machine ( 22 ) in a control housing ( 40 ) in which a control drive for driving at least one camshaft for actuating at least one gas exchange valve of the internal combustion engine ( 12 ) is arranged. Powertrain ( 10 ) for a motor vehicle, with an internal combustion engine ( 12 ), which has an output shaft ( 18 ), via which on a driven side ( 38 ) of the internal combustion engine torques for driving the motor vehicle from the internal combustion engine ( 12 ) and at least one electric machine ( 22 ), which has a rotor ( 28 ) which is coaxial with the output shaft ( 18 ), characterized in that the internal combustion engine ( 12 ) a control housing ( 40 ), in which a control drive for driving at least one camshaft for actuating at least one gas exchange valve of the internal combustion engine ( 12 ) is arranged, wherein on the control housing ( 40 ) at least one of the control housing ( 40 ) projecting in the axial direction spacer element ( 54 ) is provided, through which in the radial outward direction a receiving area ( 56 ) in which the electric machine ( 22 ) is at least partially included. Powertrain ( 10 ) according to claim 6, characterized in that the spacer element ( 54 ) separately from the control housing ( 40 ) and secured thereto or integrally with the control housing ( 40 ) is trained. Powertrain ( 10 ) for a motor vehicle, with an internal combustion engine ( 12 ), which a housing ( 14 ) and one on the housing ( 14 ) and at least partially in the housing ( 14 ) received output shaft ( 18 ), via which on a driven side ( 38 ) of the internal combustion engine ( 12 ) Torques for driving the motor vehicle of the internal combustion engine ( 12 ) and at least one electric machine ( 12 ), which has a rotor ( 28 ) which is coaxial with the output shaft ( 18 ), characterized in that the electric machine ( 12 ) in the housing ( 14 ) is arranged. Powertrain ( 10 ) according to one of claims 5 to 8, characterized in that the electrical machine ( 22 ) on the output side ( 38 ) or on one of the output side ( 38 ) opposite side ( 20 ) of the internal combustion engine ( 12 ) is arranged.

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