WO2019091719A1

WO2019091719A1 - Transmission for an electric vehicle

Info

Publication number: WO2019091719A1
Application number: PCT/EP2018/078274
Authority: WO
Inventors: Philipp Notheis; Leschek Debernitz; Niko Zwerger
Original assignee: Zf Friedrichshafen Ag
Priority date: 2017-11-10
Filing date: 2018-10-16
Publication date: 2019-05-16
Also published as: DE102017220073A1

Abstract

The invention relates to a transmission for an electric vehicle, comprising an electric machine with a driveshaft, a first shifting element, a second shifting element and a manual transmission, a gear of the manual transmission being engageable by actuating the first shifting element and/or the second shifting element. The transmission is characterized in that the electric machine is permanently in driving connection with a fluid pump.

Description

Transmission for an electric vehicle

The invention relates to a transmission for an electric vehicle, with an electric machine having a drive shaft, a first switching element, a second switching element and a transmission, wherein by operating the first switching element and / or the second switching element, a gear of the gearbox can be inserted.

Moreover, the invention relates to a drive train with the transmission according to the invention. Moreover, the invention relates to an electric vehicle with the transmission or the drive train.

The prior art already discloses a large number of differently designed transmissions which are used in electric vehicles. The electric vehicles have in common that they have only an electric drive. This means that the electric vehicles have no internal combustion engine. The electric drive can be realized by providing at least one electric machine.

WO 2011 034 762 A2 discloses an electric vehicle with a double-clutch transmission. In the electric vehicle, three switching stages can be realized.

The object of the invention is to provide a transmission for an electric vehicle, which is improved over the known transmissions.

The object is achieved by a transmission of the aforementioned type, which is characterized in that the electrical machine is always connected to a fluid pump drive technology.

The transmission according to the invention has the advantage that a simply constructed drive of the pump is realized. In addition, a recuperation is possible due to the technical connection of the electrical machine with the fluid pump in a sail mode of the electric vehicle. This is possible because the fluid pump realizes the necessary for the recuperation rotational movement. The transmission according to the invention also has the advantage that the fluid pump, which can be designed as an oil pump, is permanently driven. This is possible because in the technical connection between the electric machine and the pump, no switching element is arranged, so that the technical connection between the electric machine and the fluid pump is permanent. As a result, the fluid pump is driven as long as the drive shaft of the electric machine is rotated regardless of whether a gear is engaged or not.

The fluid pump can promote a fluid, such as oil, even if no gear is engaged in the manual transmission. In particular, the fluid pump can promote the oil in time before the gear is engaged. Thus, a wheel set in the manual transmission can be lubricated with oil, even if no gear is engaged and / or before a gear is engaged. In addition, by means of the oil supplied to the wheel set, the wheelset can be cooled.

The transmission is designed and intended to be installed in an electric vehicle. This means that the transmission, in particular the transmission components, has no connection for an internal combustion engine. In particular, a drive of the gearbox and / or a transmission output shaft can be made purely electrically.

Under a shaft is not exclusive to understand, for example, a cylindrical, rotatably mounted machine element for transmitting torque, but these are also general connecting elements to understand that connect individual components together, in particular fasteners that connect a plurality of components rotatably together.

The electric machine consists at least of a stator and a rotatably mounted rotor and is set up in a motor operation to convert electrical energy into mechanical energy in the form of speed and torque, and in a generator operation mechanical energy into electrical To transform energy in the form of electricity and voltage. The rotor may be rotatably connected to the drive shaft and / or attached to the drive shaft.

The directional data "axial" and "radial" used below refer to a transmission center axis unless otherwise stated.

In a particular embodiment, the electric machine can always be connected to the fluid pump in terms of drive technology without translation. This allows a simple design gear realized.

Alternatively, the transmission may include a summing gear and another electric machine. In this case, the electric machine and the other electric machine can always be connected to the fluid pump by means of the summation with the fluid pump. In particular, a component of the summation gear can always be connected to the fluid pump in terms of drive technology. Another component of the summation can be connected by means of the drive shaft with the electric machine, in particular always, drive technology. In this case, a branch of the drive shaft, via which the drive shaft is connected in terms of drive engineering with other components of the transmission described in more detail below, can be connected upstream of the summing gear in terms of drive technology. Another component of the summation can be connected by means of another drive shaft with the other electric machine, in particular always, drive technology. As a result, the power supplied to the fluid pump can be easily increased by means of the summing gear and the other electric machine.

The first and the second switching element may be arranged one above the other in the radial direction. This makes it possible to produce a compact in the axial direction gear. Alternatively, the first switching element and the second switching element can be arranged offset from one another in the axial direction. In this case, a compact in the radial direction gear can be realized.

The first and / or the second switching element can each be designed as a clutch. In particular, the first and / or second switching element can each as be carried out a dry clutch or a wet clutch. The switching elements can be designed as a wet clutch and in an axial arrangement as a dry clutch in a radial arrangement. In this case, the dry clutch, in particular when used in a dry clutch described below, have low drag losses.

The first switching element and the second switching element may be part of a double clutch. In particular, the dual clutch can be arranged and / or configured such that the dual clutch drivingly connected to the drive shaft drives the fluid pump, in particular directly. This can be done, for example, by a plate carrier of the double clutch, which is connected to the drive shaft as well as to the fluid pump, in particular always, in terms of drive technology. Such an arrangement and design of the double clutch allows a compact gear. The dual clutch advantageously has short switching times. In addition, the combination of high mass inertias and high differential numbers can be compensated by means of the double clutch.

Alternatively, the drive shaft can drive the fluid pump directly. This means that no other components of the transmission are technically arranged between the fluid pump and the electric machine.

In a particular embodiment, the first switching element and / or the second switching element by means of the fluid pump, in particular using a control device, be actuated. Thus, no further component is required to actuate the first and / or second switching element, in particular to close.

Alternatively or additionally, the transmission may comprise at least one actuator, by means of which the first switching element and / or the second switching element can be actuated. In particular, the transmission may have a first actuator, by means of which the first switching element can be actuated, and a second actuator, by means of which the second switching element can be actuated. Since the operation of the first and / or the second switching element in this embodiment no longer by the Fluid pump must be made, the fluid pump can be made small, since they only need to promote oil for lubrication and / or cooling of the wheelset.

In a particular embodiment, the transmission may include a transmission output shaft, a first shaft, and a second shaft. The drive shaft can be rotatably connected by means of the first switching element with the first shaft and by means of the second switching element with the second shaft. The first shaft and the second shaft can be connected to the transmission output shaft, in particular always, in terms of drive technology. In this embodiment, there is the advantage that the transmission is simple and operated in a push operation and correspondingly closed switching element in a simple manner the electric machine as a generator and power is fed into the system.

Alternatively, the transmission may include the transmission output shaft, the first shaft, and the second shaft. A further drive shaft of a further electric machine can be connected in a rotationally fixed manner to the second shaft by means of the first switching element and to the second shaft by means of the second switching element. The first shaft and the second shaft may be connected to the transmission output shaft in terms of drive technology. In this embodiment, the electric machine, in particular exclusively, serves to drive the fluid pump.

This offers the advantage that the drive of the fluid pump is independent of the required due to the driving condition speed of the transmission output shaft. Thus, it can be prevented that at slow speeds of the electric vehicle by the fluid pump is supplied to a low flow rate. In particular, the volume flow required for cooling and / or lubricating the clutch and / or the wheel set and / or the electric machine can always be provided by the fluid pump. In addition, the electric machine can be made small and compact. As a result, by the separate arrangement of the electric machine, the oil budget of the transmission can be efficiently controlled or regulated as needed. The further electric machine can always be connected to a plurality of fluid pumps in terms of drive technology. The first shaft may be arranged coaxially with the second shaft. The second shaft may be arranged as a hollow shaft which encloses at least a part of the first shaft. The first and second shafts respectively correspond to an input shaft of the manual transmission. The first and second shaft have no interface or connectivity by means of which they are connected directly or indirectly with an internal combustion engine.

A first gear of the gearbox may be rotatably connected to the first shaft and may be in engagement with a non-rotatably connected in the transmission output shaft second gear of the gearbox. A third gear of the gearbox may be rotatably connected to the second shaft and may be in engagement with a non-rotatably connected to the transmission output shaft fourth gear of the gearbox.

As a rotationally fixed connection is understood a connection between two elements, which is designed and arranged such that the two interconnected elements always have the same speed. This is not the case if, for example, between the two interconnected elements, a switching element is arranged, which is in the open state. The rotationally fixed connection can be realized for example by a spline.

In an alternative embodiment, the transmission may have a countershaft and another countershaft. A first gear of the gearbox can be rotatably connected to the first shaft and in engagement with a rotatably connected to the countershaft fifth gear of the gearbox and engaged with a rotatably connected to the other countershaft fifth other gear of the gearbox. A third gear of the gearbox can be rotatably connected to the second shaft and in engagement with a rotatably connected to the countershaft sixth gear of the gearbox and with a rotatably connected to the other countershaft sixth other gear of the gearbox. A seventh gear of the gearbox may be rotatably connected to the transmission output shaft. In this case, the seventh gear in engagement with a non-rotatably connected to the countershaft eighth gear of the shift gear and one with the other countershaft rotatably connected eight other gear of the gearbox be.

Such a transmission has the advantage that a force distribution of 50% each can take place on the two countershafts. As a result, the gear width can be reduced and the transmission can be built short. Moreover, it is an advantage of the two-organ design that the first shaft and / or the second shaft and / or the transmission output shaft are not subjected to bending.

By contrast, in the construction of the transmission, in which this has only the transmission output shaft, the transmission in the radial direction made smaller than the transmission in two-way design. However, the transmission has wider gears than the Zweivorgelegewellenbauweise and is thus formed axially longer.

The aforementioned gears can be designed as spur gears. In addition, the gears may have helical teeth, which is advantageous in terms of acoustics.

In an alternative embodiment, the transmission may have a planetary gear set. In this case, a sun gear of the planetary gear set be connected to the electric machine drive technology. In particular, the drive shaft may extend through the fluid pump and be rotatably connected to the sun gear of the planetary gear set. A bridge of the planetary gear set may be rotatably connected to a transmission output shaft and a ring gear of the planetary gear set may be rotatably connected by means of the first switching element with a housing and rotatably connected by means of the second switching element with one of the two other wheelset elements of the planetary gear set. In particular, in one embodiment, the ring gear can be rotatably connected by means of the second switching element with the web. In an alternative embodiment, the ring gear can be rotatably connected to the sun gear. In this embodiment, the drive shaft can be rotatably connected by means of the second switching element with the ring gear. Alternatively, a sun gear of the planetary gear set may be connected to a further electric machine in terms of drive technology. In particular, a further drive shaft of the further electric machine can be connected to the sun gear of the planetary gear set in a rotationally fixed manner. The web of the planetary gear set may be rotatably connected to the transmission output shaft and the ring gear of the planetary gear set may be rotatably connected by means of the first switching element with the housing and rotatably connected by means of the second switching element with one of the two other wheelset elements of the planetary gear set. In particular, in one embodiment, the ring gear can be rotatably connected by means of the second switching element with the web. In an alternative embodiment, the ring gear can be rotatably connected to the sun gear. In this embodiment, the further drive shaft can be rotatably connected by means of the second switching element with the ring gear.

The electric machine is used in this embodiment, in particular exclusively, to drive the fluid pump. This offers the advantage that the drive of the fluid pump is independent of the speed of the transmission output shaft required due to the driving condition. Thus, it can be prevented that at slow speeds of the electric vehicle by the fluid pump is supplied to a low flow rate. In particular, the volume flow required for cooling and / or lubricating the clutch and / or the wheel set and / or the electric machine can always be provided by the fluid pump. In addition, the electric machine can be made small and compact. As a result, by the separate arrangement of the electric machine, the oil budget of the transmission can be efficiently controlled or regulated as needed. The further electric machine can always be connected to a plurality of fluid pumps in terms of drive technology.

The planetary gear has the advantage that a high efficiency can be realized. Further advantages of the planetary gearbox are the radial bearing, the compact design and the good acoustics. In a particular embodiment, at least two gears, in particular exactly two gears, can be realized by the gearbox. In this case, a first gear can be realized by closing the second switching element, wherein the first switching element is open. A second gear can be realized by closing the first switching element, wherein the second switching element is open. The two courses have a different translation. The second gear has the advantage that the electric machine can work efficiently at high speeds. Of course, alternative transmissions may have more than two gears.

By means of the two gears, a forward driving operation of the electric vehicle can be realized. A reverse driving operation of the electric vehicle can be realized in that the drive shaft rotates in a different, in particular reverse, direction of rotation than in a forward drive operation. For this purpose, the drive shaft must be driven by the electric machine in a different direction of rotation.

As a result, a simple and compact transmission can be realized which is light, quiet and high in efficiency.

Of particular advantage is a drive train for an electric vehicle with the transmission according to the invention and an axle differential and / or another axle differential. In this case, the transmission output shaft with the axle differential and / or the other axle differential, in particular always, be connected by drive technology. The axle differential is connected to two wheels of the electric vehicle, in particular always, in terms of drive technology. The other axle differential is connected to two other wheels of the electric vehicle, in particular always, driving technology. The drive train is designed such that only a purely electric drive of the gearbox can take place. The drive train thus has no internal combustion engine.

In this case, the transmission output shaft can be directly or indirectly connected to the axle differential drive technology. Such a compound lends itself to a longitudinal drive train, in which the transmission output shaft runs parallel to the direction of travel of the electric vehicle. This is an indirect technical drive Realized connection between the transmission output shaft and the axle differential, for example, characterized in that the transmission output shaft is connected by means of a connecting shaft with the axle differential drive technology.

Alternatively, the transmission output shaft can be connected by means of a bevel gear with the axle differential. Such a compound is useful in a transverse drive train in which the transmission output shaft extends transversely, in particular perpendicularly, to the direction of travel. Alternatively or additionally, the transmission output shaft can be connected by means of a gear set with the axle differential. The wheels of the wheelset may have a beveloid toothing.

The transmission output shaft can also be connected by means of a hang-on coupling with another axle differential. In particular, the transmission output shaft can be connected by means of the bevel gear and the hang-on clutch with the other axle differential.

Alternatively or additionally, the dual clutch can also be electrically operated, so that no pump is required for the double clutch.

Of particular advantage is an electric vehicle with the transmission according to the invention or the drive train according to the invention.

In the figures, the subject invention is shown schematically and will be described below with reference to the figures, wherein the same or equivalent elements are usually provided with the same reference numerals. Showing:

Fig. 1 is an illustration of the transmission according to the invention according to a first

Embodiment,

Fig. 2 is an illustration of the transmission according to the invention according to a second

Embodiment,

Fig. 3 is an illustration of the transmission according to the invention according to a third

Embodiment, 4 shows a representation of the transmission according to the invention according to a fourth embodiment,

Fig. 5 is an illustration of the transmission according to the invention according to a fifth

Embodiment,

6 is an illustration of the transmission according to the invention according to a sixth embodiment,

Fig. 7 is an illustration of the transmission according to the invention according to a seventh

Embodiment,

Fig. 8 is an illustration of the transmission according to the invention according to an eighth

Embodiment,

9 is an illustration of the transmission according to the invention according to a ninth embodiment

10 is an illustration of the transmission according to the invention according to a tenth embodiment

11 is an illustration of the transmission according to the invention according to an eleventh

embodiment

Fig. 12 is an illustration of the transmission according to the invention according to a twelfth embodiment

Fig. 13 is an illustration of the transmission according to the invention according to a thirteenth embodiment

Fig. 14 is an illustration of the transmission according to the invention according to a fourteenth embodiment

Fig. 15 is an illustration of the transmission according to the invention according to a fifteenth embodiment

Fig. 16 is an illustration of the transmission according to the invention according to a sixteenth embodiment

17 is an illustration of an alternative drive of a fluid pump of the transmission according to the invention,

18 shows a switching matrix of the gears shown in FIGS. 1 to 16,

19 shows a drive train according to a first exemplary embodiment with the transmission according to the invention,

20 shows a drive train according to a second embodiment with the transmission according to the invention, 21 shows a drive train according to a third embodiment with the transmission according to the invention,

Fig. 22 shows a drive train according to a fourth embodiment with the transmission according to the invention.

The transmission 1 shown in Figure 1 has an electric machine 2 with a drive shaft 3, a first switching element K1, a second switching element K2 and a transmission 6 on. By operating the first switching element K1 and / or the second switching element K2, a gear of the gearbox 6 can be inserted. In addition, the transmission 1 has a fluid pump 7 for conveying oil. The electric machine 2 is always connected to the fluid pump 7 in terms of drive technology.

The first switching element K1 and the second switching element K2 are part of a double clutch 4. Here, the drive shaft 3 is always connected with the dual-clutch transmission. The double clutch 4 is in turn directly connected to the fluid pump 7 by drive technology. In particular, a disk carrier 5 of the dual clutch 4 is directly connected to the fluid pump 7 by a drive. Thus, the electric machine 2 is always connected by means of the dual clutch 4 with the fluid pump 7 in terms of drive technology.

The transmission 1 has a first shaft 11 and a second shaft 12. The first shaft 11 and the second shaft 12 are arranged coaxially with a transmission center axis M. In this case, the second shaft 12 encloses a part of the first shaft 11. The drive shaft 3 is connected by means of the first switching element K1 with the first shaft 11 rotatably connected. In addition, the drive shaft 3 by means of the second switching element K2 with the second shaft 12 rotatably connected. The first switching element K1 and the second switching element K2 are arranged offset from one another in the radial direction. In particular, the first switching element K1 is arranged in the radial direction above the second switching element K2.

The transmission 6 has two sets of wheels. A first wheel set is formed by a first gear 13 and a second gear 14. In this case, the first gear 13 is rotatably connected to the first shaft 11. The second gear 14 is connected to the drive output shaft 10 rotatably connected and is in engagement with the first gear 13. A second set of wheels is formed by a third gear 15 and a fourth gear 16. The third gear 15 is rotatably connected to the second shaft 12 and the fourth gear 16 is rotatably connected to the transmission output shaft 10 and is engaged with the third gear 15 in engagement. The two wheelsets have different translations.

Figure 2 shows a transmission 1 according to a second embodiment. It differs from the transmission 1 illustrated in FIG. 1 in that a further electric machine 33 with a further drive shaft 32 is present. The further electric machine 33 is arranged such that the further drive shaft 32 is rotatably connected by means of the first switching element K1 with the first shaft 11. In addition, the further drive shaft 32 by means of the second switching element K2 with the second shaft 12 rotatably connected.

The electric machine 2 drives the fluid pump 7. However, the fluid pump 7 is not connected to the other electric machine 33 in terms of technology.

FIG. 3 shows a transmission 1 according to a third exemplary embodiment. The transmission 1 differs from the transmission 1 illustrated in FIG. 1 in the design of the gearbox 6. The gearbox 6 has a countershaft 17 and another countershaft 18. In addition, the transmission 6 has three sets of wheels.

In a first set of wheels, the first gear 11 rotatably connected to the first gear 13 with a fifth gear 24 of the gearbox 6 and with a fifth other gear 25 of the gearbox 6 is respectively engaged. The fifth gear 24 is rotatably connected to the countershaft 17 and the fifth other gear 25 is rotatably connected to the other countershaft 18.

In a second set of wheels with the second shaft 12 rotatably connected third gear 15 with a sixth gear 26 of the gearbox 6 and with a sixth other gear 27 of the gearbox 6 is respectively engaged. The sixth gear 26 is rotatably connected to the countershaft 17 and the sixth other gear 27 is rotatably connected to the other countershaft 18.

In a third set of wheels, a rotationally fixedly connected to the transmission output shaft 10 seventh gear 28 with an eighth gear 29 and an eighth other gear 30 is respectively engaged. The eighth gear 29 is rotatably connected to the countershaft 17 and the eighth other gear 30 is rotatably connected to the other countershaft 18.

FIG. 4 shows a transmission 1 according to a fourth exemplary embodiment. It differs from the transmission 1 shown in FIG. 3 in that a further electric machine 33 with a further drive shaft 32 is present. The further electric machine 33 is arranged such that the further drive shaft 32 is rotatably connected by means of the first switching element K1 with the first shaft 11. In addition, the further drive shaft 32 by means of the second switching element K2 with the second shaft 12 rotatably connected.

Figure 5 shows a transmission 1 according to a fifth embodiment. The transmission 1 shown in Figure 5 differs from the transmission 1 shown in Figure 1 in the arrangement of the first switching element K1 and the second switching element K2. Thus, in the embodiment illustrated in FIG. 5, the first switching element K1 is arranged offset in the axial direction relative to the second switching element K2. In this case, the first switching element K1 and the second switching element K2 have the same outer diameter.

Figure 6 shows a transmission 1 according to a sixth embodiment. It differs from the transmission illustrated in FIG. 5 in that a further electric machine 33 with a further drive shaft 32 is present. The further electric machine 33 is arranged such that the further drive shaft 32 by means of the first switching element K1 with the first shaft 11 is rotatably connected. In addition, the further drive shaft 32 by means of the second switching element K2 with the second shaft 12 rotatably connected.

Figure 7 shows a transmission 1 according to a seventh embodiment. The transmission 1 shown in Figure 7 differs from the transmission 1 shown in Figure 3 in the arrangement of the first switching element K1 and the second switching element K2. Thus, in the embodiment shown in Figure 7, the first switching element K1 is arranged offset in the axial direction to the second switching element K2. In this case, the first switching element K1 and the second switching element K2 have the same outer diameter.

Figure 8 shows a transmission 1 according to an eighth embodiment. It differs from the transmission 1 illustrated in FIG. 7 in that a further electric machine 33 with a further drive shaft 32 is present. The further electric machine 33 is arranged such that the further drive shaft 32 is rotatably connected by means of the first switching element K1 with the first shaft 11. In addition, the further drive shaft 32 by means of the second switching element K2 with the second shaft 12 rotatably connected.

FIG. 9 shows a ninth exemplary embodiment of the transmission 1 according to the invention. The transmission 1 differs as follows from the transmissions 1 shown in FIGS. 1 to 8. Thus, one difference is that the manual transmission 6 has a planetary gear transmission PS. Another difference is that the electric machine EM is connected by means of the dual clutch 4 and the fluid pump 7 with the planetary gearbox PS in terms of drive technology. In this case, a sun gear of the planetary gearset PS with the drive shaft 3, in particular translation-free, driving technology connected. A web of the planetary gearset PS is rotatably connected to the transmission output shaft 10. A ring gear of the planetary gearset PS is rotatably connected by means of the first switching element K1 with a housing G. The housing G may be the transmission housing or the housing of the electric vehicle. In both cases, the housing G does not rotate during operation of the transmission 1.

In addition, the ring gear by means of the second switching element K2 rotatably connected to the sun gear of the planetary gear set PS. In a closed second switching element K2, the ring gear is rotatably connected to the sun gear of the planetary gearset PS, whereby a direct gear is realized. In addition, the ring gear of the planetary gearset PS by means of the second switching element K2 with the drive shaft 3 rotatably connected. The first switching element K1 is arranged in the radial direction above the second switching element K2.

FIG. 10 shows a tenth exemplary embodiment of the transmission 1 according to the invention. It differs from the transmission 1 shown in FIG. 9 in that a further electric machine 33 with a further drive shaft 32 is present. The further drive shaft 32 is rotatably connected directly to the sun gear of the planetary PS. The electric machine 2 drives the fluid pump 7. However, the fluid pump 7 is not connected to the other electric machine 33 in terms of technology.

Figure 11 shows a transmission 1 according to an eleventh embodiment. The transmission 1 shown in Figure 11 differs from the transmission 1 shown in Figure 9 in the coupling of the ring gear. Thus, in the embodiment shown in Figure 11, the ring gear of the planetary gearset PS by means of the second switching element K2 with the web of the planetary gear set PS rotatably connected. The drive shaft 3 is no longer rotatably connected in this embodiment by means of the second switching element K2 with the ring gear. Another difference is that the drive shaft 3 extends through the fluid pump 7 and with the sun gear of the planetary gearset PS technically connected, in particular rotatably connected.

FIG. 12 shows a twelfth exemplary embodiment of the transmission 1 according to the invention. It differs from the transmission 1 shown in FIG. 11 in that a further electric machine 33 with a further drive shaft 32 is present. The further drive shaft 32 is rotatably connected directly to the sun gear of the planetary PS. The electric machine 2 drives the fluid pump 7. However, the fluid pump 7 is not connected to the further electric machine 33 in terms of drive technology.

Figure 13 shows a Getnebe 1 according to a thirteenth embodiment. The transmission 1 shown in Figure 13 differs from the transmission 1 shown in Figure 9 in the arrangement of the first switching element K1 and the second switching element K2. In the embodiment shown in Figure 13, the first switching element K1 and the second switching element K2 are arranged offset from one another in the axial direction.

FIG. 14 shows a fourteenth embodiment of the transmission 1 according to the invention. It differs from the transmission 1 shown in FIG. 13 in that a further electric machine 33 with a further drive shaft 32 is present. The further drive shaft 32 is rotatably connected directly to the sun gear of the planetary gearset PS. The electric machine 2 drives the fluid pump 7. However, the fluid pump 7 is not connected to the other electric machine 33 in terms of technology.

FIG. 15 shows a transmission 1 according to a fifteenth embodiment. The transmission 1 shown in Figure 15 differs from the transmission shown in Figure 11 in the arrangement of the first switching element K1 and the second switching element K2. In FIG. 15, the first switching element K1 and the second switching element K2 are arranged offset from one another in the axial direction. FIG. 16 shows a sixteenth embodiment of the transmission 1 according to the invention. It differs from the transmission 1 shown in FIG. 15 in that a further electric machine 33 with a further drive shaft 32 is present. The further drive shaft 32 is rotatably connected directly to the sun gear of the planetary PS. The electric machine 2 drives the fluid pump 7. However, the fluid pump 7 is not connected to the other electric machine 33 in terms of technology.

17 shows an alternative drive of the fluid pump 7. The drive shown in FIG. 17 can be used instead of the drives for the fluid pump 7 shown in FIGS. 1, 3, 5, 7, 9, 11, 13 and 15. In comparison to the drives shown in FIGS. 1, 3, 5, 7, 9, 11, 13 and 15, the gearbox 1 has, in addition to the electric machine 2, another electric machine 9. In addition, the transmission 1 has a summing gear 8. A component of the summing 8 is connected to the fluid pump 7 drive technology and other component of the summation 8 is connected to the drive shaft 3 in terms of drive technology. Another component of the summation 8 is connected to another drive shaft 19 of the other electric machine 9 in terms of drive technology.

A branch 31 of the drive shaft 3, via which the drive shaft 3 can be connected to the other transmission components, not shown in FIG. 17, such as the first shift element K1 and the second shift element K2, takes place prior to the summation drive 8.

FIG. 18 shows a switching matrix of the transmission illustrated in FIGS. 1 to 16. Thus, each of the transmission has exactly two gears, namely a first gear G1 and a second gear G2. The first gear G1 can be realized by closing the second switching element K2, wherein the first switching element K1 is open. The second gear G2 can be realized by closing the first switching element K1, wherein the second switching element K2 is open.

FIG. 19 shows an electric vehicle 22 with a drive train 20 according to a first embodiment. The drive train 20 has the transmission 1 shown in FIG and an axle differential 21. In this case, the transmission output shaft 10 by means of a bevel gearbox 23 of the drive train 20 with the axle differential 21 is connected by drive technology. The axle differential 21 in turn is connected to two vehicle wheels of the electric vehicle 22. FIG. 19 shows a drive train 20 transverse to the direction of travel F of the electric vehicle 22, in particular a transverse transmission 1.

FIG. 20 shows an electric vehicle 22 with a drive train 20 according to a second embodiment. The drive train 20 differs from the drive train 20 shown in FIG. 19 in that the drive train 20, in particular the transmission 1, is longitudinal to the travel direction F of the electric vehicle 22. Another difference is that the transmission output shaft 10 directly and thus not by means of a bevel gear 23 with the axle differential 21 is connected by drive technology.

FIG. 21 shows an electric vehicle 22 with a drive train 20 according to a third embodiment. The drive train 20 has the transmission 1 shown in FIG. 9 and an axle differential 21. In this case, the transmission output shaft 10 is connected by means of a wheel 34 of the drive train 20 with the axle differential 21. The wheels of the wheelset 34 have beveloid teeth. The axle differential 21 in turn is connected to two vehicle wheels of the electric vehicle 22 in terms of drive technology.

In addition, the transmission output shaft 10 is connected by means of a hang-on clutch 35 with another axle differential 36. The other axle differential 36 is connected to two other vehicle wheels of the electric vehicle 22 in terms of drive technology. The drive train 20 shown in FIG. 22 runs along the direction of travel F of the electric vehicle 22.

FIG. 22 shows an electric vehicle 22 with a drive train 20 according to a fourth embodiment. The drive train 20 differs from the drive train 20 shown in FIG. 21 in that the drive train 20, in particular the transmission 1, is transverse to the travel direction F of the electric vehicle 22. Another Difference is that the transmission output shaft 10 by means of the bevel gear 23 with the axle differential 21 is connected by drive technology. In addition, the transmission output shaft 10 is connected by means of the bevel gear 23 and the hang-on clutch 35 with the other axle differential 36.

Reference gear

electric machine

drive shaft

Double coupling

plate carrier

manual transmission

fluid pump

summing

other electric machine

Transmission output shaft

first wave

second wave

first gear

second gear

third gear

fourth gear

Countershaft

other countershaft

other drive shaft

powertrain

axle differential

electric vehicle

bevel gear

fifth gear

fifth other gear

sixth gear

sixth other gear

seventh gear

eighth gear

Eight other gear

diversion 32 more drive shaft

33 more electric machine

34 wheelset

35 Hang-on coupling

36 different axle differential

F direction of travel

G housing

M gear center axis

G1 first gear

G2 second gear

K1 first switching element

K2 second switching element

PS planetary gear set

Claims

claims

1. transmission (1) for an electric vehicle (22), with an electric machine (2) with a drive shaft (3), a first switching element (K1), a second switching element (K2) and a gearbox (6), wherein by pressing the first switching element (K1) and / or the second switching element (K2) a gear of the gearbox (6) can be inserted, characterized in that the electric machine (2) with a fluid pump (7) is always connected by drive technology.

2. Transmission (1) according to claim 1, characterized in that

a. the electric machine (2) is always connected to the fluid pump (7) in terms of transmission technology, or that

b. the transmission (1) has a summing gear (8) and another electric machine (9), the electric machine (2) and the other electric machine (9) always being connected to the fluid pump (7) by means of the summing gear (8) are.

3. Transmission (1) according to claim 1 or 2, characterized in that

a. the first switching element (K1) and the second switching element (K2) are arranged one above the other in the radial direction or that

b. the first switching element (K1) and the second switching element (K2) are arranged offset from each other in the axial direction.

4. transmission (1) according to one of claims 1 to 3, characterized in that a. the first switching element (K1) and the second switching element (K2) are part of a double clutch (4) or that

b. the first shift element (K1) and the second shift element (K2) are components of a dual clutch (4), the drive shaft (3) driving the fluid pump (7) directly or the dual clutch (4) connected to the drive shaft (3) driving the fluid pump (7)

5. Transmission (1) according to one of claims 1 to 4, characterized in that a. the first switching element (K1) and / or the second switching element (K2) can be actuated by means of the fluid pump (7) and / or that b. the transmission (1) has at least one actuator by means of which the first switching element (K1) and / or the second switching element (K2) can be actuated.

6. transmission (1) according to one of claims 1 to 5, characterized in that a. the transmission (1) a transmission output shaft (10), a first shaft

(11) and a second shaft (12), wherein the drive shaft (3) by means of the first switching element (K1) with the first shaft (11) and by means of the second switching element (K2) with the second shaft (12) rotatably connected and the first shaft (11) and the second shaft

(12) are connected to the transmission output shaft (10) driving technically or that

the transmission (1) has a transmission output shaft (10), a first shaft (11) and a second shaft (12), wherein a further drive shaft (3) of a further electric machine (33) by means of the first switching element (K1) with the first Shaft (11) and by means of the second switching element (K2) with the second shaft (12) rotatably connected and the first shaft (11) and the second shaft (12) with the transmission output shaft (10) are connected by drive technology.

7. transmission (1) according to claim 6, characterized in that a first gear (13) of the gearbox (6) with the first shaft (11) is rotatably connected and in engagement with a with the transmission output shaft (10) rotatably connected second gear (14) of the gearbox (6) and that a third gear (15) of the gearbox (6) with the second shaft (12) is rotatably connected and in engagement with a with the transmission output shaft (10) rotatably connected fourth gear (16) of the gearbox (6).

8. Transmission (1) according to claim 6, characterized in that the gearbox (6) has a countershaft (17) and another countershaft (18) and

a first gear (13) of the gearbox (6) rotatably connected to the first shaft (11) and in engagement with a with the countershaft (17) rotatably connected fifth gear (24) of the gearbox (6) and in engagement with a with the other countershaft (18) rotatably connected fifth other gear (25) of the gearbox (6) and that

a third gear (15) of the gearbox (6) rotatably connected to the second shaft (12) and in engagement with a with the countershaft (17) rotatably connected sixth gear (26) of the gearbox (6) and one with the other countershaft (18) rotatably connected sixth other gear (27) of the gearbox (6) and that

a seventh gear (28) of the gearbox (6) with the transmission output shaft (10) is rotatably connected, wherein the seventh gear (28) in engagement with a with the countershaft (17) rotatably connected eighth gear (29) of the gearbox (6) and one with the other countershaft (18) rotatably connected eight other gear (30) of the gearbox (6).

9. transmission (1) according to one of claims 1 to 8, characterized in that a. the gearbox (6) has a planetary gear (PS), wherein a sun gear of the planetary gear set (PS) with the electric machine (2) is technically connected and a web of the planetary gear set (PS) with the transmission output shaft (10) is rotatably connected and a Ring gear of the planetary gear set (PS) by means of the first switching element (K1) with a housing (G) is rotatably connected and by means of the second switching element (K2) with one of the two other wheelset elements of the planetary gear set (PS) rotatably connected or that b. the gearbox (6) has a planetary gear set (PS), wherein a sun gear of the planetary gear set (PS) is connected to a further electric machine (33) and a web of the planetary gear set (PS) is rotatably connected to the transmission output shaft (10) and a Ring gear of the planetary gear set (PS) by means of the first switching element (K1) with a housing (G) is rotatably connected and by means of the second switching element (K2) with one of the two other wheelset elements of the planetary gear set (PS) is rotatably connected.

10. Transmission (1) according to claim 9, characterized in that the drive shaft (3) or a further drive shaft (32) of the further electric machine (33)

a. extends through the fluid pump (7) and rotatably connected to the sun gear of the planetary gear set (PS) and / or b. by means of the second switching element (K2) with the ring gear of the planetary gear set (PS) is rotatably connected.

11. Transmission (1) according to one of claims 1 to 10, characterized in that at least two gears can be realized by the transmission (1), wherein a. a first gear (G1) can be realized by closing the second switching element (K2), the first switching element (K1) being open or

b. a second gear (G2) can be realized by closing the first switching element (K1), the second switching element (K2) being open.

12. Transmission according to one of claims 1 to 11, characterized in that a reverse drive operation by reversing the direction of rotation of the drive shaft (3) can be realized.

13. A drive train (20) for an electric vehicle (22) with a transmission (1) according to one of the preceding claims 1 to 12 and an axle differential (21) and / or another axle differential (36), characterized in that the transmission output shaft (10 ) is drivingly connected to the axle differential (21) and / or the other axle differential (36).

14. Drive train (20) according to claim 13, characterized in that

a. the transmission output shaft (10) is directly or indirectly connected to the axle differential (21) in terms of drive technology or b. the transmission output shaft (10) by means of a bevel gear (23) and / or a wheel set (34) with the axle differential (21) is connected by drive technology.

15. Electric vehicle (22) with a transmission (1) according to one of claims 1 to 12 or a drive train (20) according to claim 13 or 14.