Patent ID: 12228199

DETAILED DESCRIPTION

The single FIGURE shows, in a schematic depiction, an electric drive system10for a motor vehicle. In its fully produced state, the motor vehicle thus has the electric drive system10, by means of which the motor vehicle can be driven electrically, in particular purely electrically. The motor vehicle has at least or exactly two axles arranged one after the other, and thus one behind the other in the longitudinal direction of the vehicle. The respective axle has at least or exactly two wheels also described as vehicle wheels, wherein the respective wheels of the respective axle are arranged on opposite sides of the motor vehicle in the transverse direction of the vehicle. For example, the drive system10is assigned to at least or exactly one of the axles, such that by means of the electric drive system10, at least or only those wheels of the axle can be driven to which the electric drive system10has been assigned. The wheels, which can be driven by means of the electric drive system10, are also described as drive wheels. The drive wheels are depicted particularly schematically in the FIGURE, and labelled12and14. By driving the drive wheels12and14, in particularly purely electrically, by means of the drive system10, the motor vehicle can be driven electrically, in particular purely electrically.

The drive system10has a first electric engine16, which has a first stator18and a first rotor20. By means of the stator18, the rotor20can be driven, and thus be rotated relative to the stator18around a first engine axis of rotation. The drive system10has a housing22depicted particularly schematically in the FIGURE, which is also described as a housing device or housing element. The rotor20can be rotated around the first engine axis of rotation relative to the stator18and relative to the housing22. The drive system10additionally comprises a second electric engine24, which has a second stator26and a second rotor28. By means of the stator26, the rotor28can be driven, and thus be rotated relative to the stator26and relative to the housing22around a second engine axis of rotation. In the exemplary embodiment shown in the FIGURE, the two specified electric engines16and24are arranged coaxially with each other, such that the engine axes of rotation coincide. The first electric engine16can provide first torques via its first rotor20, and the second electric engine24can provide second torques via its second rotor28.

The drive system10has a planetary transmission30, which has a first planetary gear set32, a second planetary gear set34, a first input shaft36, and a second input shaft38. In addition, the planetary transmission30has a first output shaft40and a second output shaft42. The first input shaft36is designed to introduce the first torques originating from the first electric engine16, i.e., provided by the first electric engine16via the rotor20, and thus by the first rotor20into the planetary transmission30. The second input shaft38is designed to introduce the second torques originating from the second electric engine24, i.e., provided by the second electric engine24via the rotor28, and thus by the first rotor28into the planetary transmission30. The first output shaft40is designed to divert third torques, which for example result from the first torques and/or second torques introduced into the planetary transmission30, from the planetary transmission30. The second output shaft42is designed to divert fourth torques, which for example result from the first torques and/or second torques introduced into the planetary transmission30, from the planetary transmission30.

The first planetary gear set32has a first sun gear44which is connected, in particular permanently, to the first rotor20for conjoint rotation therewith, and a first planetary carrier46, which is connected, in particular permanently, to the first output shaft40for conjoint rotation therewith. In addition, the first planetary gear set32has a first annular gear48, which is connected, in particular permanently, to the second output shaft42for conjoint rotation therewith. The first planetary gear set34has a second sun gear49, which is connected, in particular permanently, to the second rotor28for conjoint rotation therewith. In addition, the second planetary gear set34has a second planetary carrier50, which is connected, in particular permanently, to the first planetary carrier46for conjoint rotation therewith.

To be able to implement a particularly compact structure of the drive system10and a particularly advantageous driveability, the second planetary gear set34has a second annular gear52, which is connected, in particular permanently connected, to the first annular gear48for conjoint rotation therewith.

Preferably, the first planetary carrier46is designed as a single planetary carrier, on which first planetary gears54are rotatably held. The respective first planetary gear54engages for example, in particular simultaneously, with the sun gear44and the annular gear48. The second planetary carrier50is, for example, designed as a double planetary carrier, on which second planetary gears56and third planetary gears58are rotatably mounted. It is the case that the second planetary gears56engage with the sun gear49, but do not engage with the annular gear52, wherein it is the case that the third planetary gears58engage with the annular gear52, but do not engage with the sun gear49. The sun gear49thus engages with the planetary gears56, and the planetary gears58engage with the annular gear52, wherein the planetary gears56and58engage with each other. The planetary gears56further do not engage with the annular gear52, and the planetary gears58do not engage with the sun gear49. In addition, the first planetary gears54are designed separately from the second planetary gears56and separately from the third planetary gears58.

It is further preferably provided that the annular gears48and52have different gearing diameters, in particular different pitch diameters.

It has further proved particularly advantageous if the first planetary gear set32is designed for a stationary transmission ratio of +3. It has further proved advantageous if the second planetary gear set34is designed for a stationary transmission ratio of −2.

The electric drive system10has a first transmission stage60, which is arranged in the first torque flow downstream of the first output shaft40in relation to a first torque flow, along which the third torques can be diverted from the planetary transmission30via the first output shaft40. In the first torque flow, a first side shaft62is for example arranged, which is arranged in the first torque flow, and downstream of the first transmission stage60. The side shaft62can be driven by the output shaft40via the transmission stage60, wherein the wheel12can be driven by the side shaft62, and thus via the side shaft62by the transmission stage60. The drive system10additionally comprises a second transmission stage64, which is arranged in the second torque flow downstream of the second output shaft42in relation to a second torque flow, along which the fourth torques can be diverted from the planetary transmission30via the second output shaft42. In the second torque flow, downstream of the transmission stage64, a second side shaft66is arranged, wherein the wheel14can be driven via the side shaft66of the transmission stage64. In addition, the side shaft66can be driven by the output shaft42via the transmission stage64. Consequently, the side shaft62can be driven by the output shaft40via the transmission stage60. The respective transmission stage60,64is also described as a final drive (FD). Preferably, the transmission stage60is a third planetary gear set, wherein it is conceivable that the transmission stage64is a fourth planetary gear set. Preferably, the third planetary gear set and the fourth planetary gear set are identical in structure, i.e., identical or similar with regard to their construction, and thus with regard to their transmission ratio.

It has further proved particularly advantageous if the transmission stages60and64, the planetary gear sets32and34, and the rotors20and28are arranged in the shared housing22of the electric drive system10. In the exemplary embodiment shown in the FIGURE, it is additionally provided that the planetary transmission30, the rotors20and28and the two transmission stages60and64are arranged coaxially with one another.

Although the invention has been illustrated and described in detail by way of preferred embodiments, the invention is not limited by the examples disclosed, and other variations can be derived from these by the person skilled in the art without leaving the scope of the invention. It is therefore clear that there is a plurality of possible variations. It is also clear that embodiments stated by way of example are only really examples that are not to be seen as limiting the scope, application possibilities or configuration of the invention in any way. In fact, the preceding description and the description of the FIGURES enable the person skilled in the art to implement the exemplary embodiments in concrete manner, wherein, with the knowledge of the disclosed inventive concept, the person skilled in the art is able to undertake various changes, for example, with regard to the functioning or arrangement of individual elements stated in an exemplary embodiment without leaving the scope of the invention, which is defined by the claims and their legal equivalents, such as further explanations in the description.

LIST OF REFERENCE NUMERALS

10electric drive system12drive wheel14drive wheel16first electric engine18first stator20first rotor22housing24second electric engine26second stator28second rotor30planetary transmission32first planetary gear set34second planetary gear set36first input shaft38second input shaft40first output shaft42second output shaft44first sun gear46first planetary carrier48first annular gear49second sun gear50second planetary carrier52second annular gear54first planetary gear56second planetary gear58third planetary gear60first transmission stage62first side shaft64second transmission stage66second side shaft