Oil guide arrangement for a drive unit

Abstract

An oil guide arrangement can be used for a drive unit (2) with an electrical machine having a rotor (71), a rotor bearing (44), a first gear set, and a second gear set. The oil guide arrangement has a wall section (61) and an oil supply device. The wall section (61) forms a main oil channel (90), an oil channel (91) for the rotor bearing (44), an oil channel (92) for the rotor (71), an oil channel (93) for the first gear set, and an oil channel (94) for the second gear set. The main oil channel (90) is designed to receive oil from the oil supply device. The oil channel (91) for the rotor bearing (44) is in fluid communication with the main oil channel (90). The oil channel (92) for the rotor (71) is in fluid communication with the main oil channel (90). The oil channel (93) for the first gear set is in fluid communication with the oil channel (91) for the rotor bearing (44).The oil channel (94) for the second wheel set is designed to receive oil from the oil supply device.

Description

Technical area

[0001] The present invention relates to an oil guide arrangement for a drive unit, a drive unit for a vehicle and a vehicle. State of the art

[0002] An oil guide arrangement supplies oil to various components of the drive unit for lubrication and cooling. Particularly in a drive unit that includes an electric motor with a rotor, a rotor bearing, a first gear set, and a second gear set, a large number of oil channels are required to lubricate the components. Description of the invention

[0003] It is an object of the present invention to provide an improved oil guide arrangement which enables oil guidance in a simple manner and ensures good oiling of the components.

[0004] The object is achieved by an oil guide arrangement having the features of claim 1. Advantageous further developments are the subject of the dependent claims.

[0005] An oil guide assembly is applicable to a drive unit with an electric machine having a rotor, a rotor bearing, a first gear set, and a second gear set. The oil guide assembly has a wall section and an oil supply device. The wall section can be stationary. The wall section can be connected in a rotationally fixed manner to a stationary component, for example, a housing.

[0006] The wall section forms a main oil channel, an oil channel for the rotor bearing, an oil channel for the rotor, an oil channel for the first gear set, and an oil channel for the second gear set. The main oil channel is designed to receive oil from the oil supply device. The oil channel for the rotor bearing is in fluid communication with the main oil channel. The oil channel for the rotor is in fluid communication with the main oil channel. The oil channel for the first gear set is in fluid communication with the oil channel for the rotor bearing. The oil channel for the second gear set is designed to receive oil from the oil supply device.

[0007] If two elements are coupled together, a movement of one element causes a reaction in the other element. For example, a connection can be provided by a positive or frictional connection. Additional elements can be provided between the elements. For example, a connection can be rotationally fixed. A rotationally fixed connection between two elements is understood to be a connection in which the two elements are rigidly coupled to one another in all intended states, e.g., a transmission, so that they essentially have the same speed. The elements can be present as individual components connected to one another in a rotationally fixed manner or as a single piece.

[0008] If two elements are fluidly connected, a fluid, such as oil, can be conducted from one element to the other. The fluid connection can be designed to be leak-free, so that the oil is essentially completely conducted from one element to the other.

[0009] An oil flow direction is the direction in which the oil moves within the oil guide assembly to reach the components being lubricated. Specifically, the beginning of an oil channel is located upstream of an end of an oil channel in the oil flow direction.

[0010] The main oil channel may have an outer section extending from the outside to the inside in the radial direction of the rotor bearing. The main oil channel may have an inner section extending inward in the radial direction and in the axial direction. The inner section may extend obliquely toward the rotor bearing with respect to a radial direction. The main oil channel may be in fluid communication with the oil supply device via a recess at a beginning in the oil flow direction of the main oil channel.

[0011] At least one of the main oil channel and the oil channels for the rotor, the rotor bearing, the first gear set, and the second gear set can be formed using cylindrical bores. At least two of the main oil channel and the oil channels for the rotor, the rotor bearing, and the second gear set can have the same diameter. Throttle elements, such as nozzles or bearings, for throttling the oil flow can be provided in at least one of the main oil channel and the oil channels for the rotor, the rotor bearing, the first gear set, and the second gear set.

[0012] The oil channel for the rotor bearing can be in fluid communication with one end of the main oil channel. The oil channel for the rotor bearing can extend from the end of the inner section of the main oil channel in the same direction as the inner section. In particular, the oil channel for the rotor bearing can be an extension of the inner section of the main oil channel. The oil channel for the rotor can be in fluid communication with the end of the main oil channel. The oil channel for the rotor can extend from the end of the inner section of the main oil channel in the axial direction of the rotor bearing. The oil channel for the first gear set can be in fluid communication with one end of the oil channel for the rotor bearing. The oil channel for the first gear set can extend from one end of the oil channel for the rotor bearing in the axial direction. The oil channel for the first gear set can extend in the axial direction opposite to the oil channel for the rotor.The oil channel for the second gear set can extend radially from the outside to the inside.

[0013] In one embodiment, the oil passage for the rotor bearing and the oil passage for the rotor can be in fluid communication with the main oil passage at the same position. In particular, the main oil passage can split into the oil passage for the rotor bearing and the oil passage for the rotor at one position.

[0014] In one embodiment, the oil channel for the first gear set can be fluidly connected to the oil channel for the rotor bearing via at least one bearing seat. The oil channel for the first gear set can be fluidly connected to one end of the oil channel for the rotor bearing.

[0015] The oil channel for the first gear set can be in fluid communication with the oil channel for the rotor bearing via two bearing seats. The two bearing seats can have a bearing seat for the rotor bearing. The bearing seat for the rotor bearing can be formed by the rotor and the wall section. The rotor bearing can be designed as a deep groove ball bearing and can throttle the oil flow in the oil channel for the first gear set. The two bearing seats can have a bearing seat for a bearing of a first planet carrier. The bearing seat for the bearing of the first planet carrier can be formed by the first planet carrier and the wall section. The bearing of the first planet carrier can be designed as a needle roller bearing and can throttle the oil flow in the oil channel for the first gear set.

[0016] The two bearing seats can be designed to be adjacent to each other. The bearing seat for the rotor bearing and the bearing seat for the first planet carrier bearing can be arranged in this order in the oil flow direction. A gap can be provided between the bearing seat of the first planet carrier bearing and the bearing seat of the rotor bearing in the oil flow direction. The oil flow direction in the gap can be in the axial direction.

[0017] In one embodiment, the oil guide arrangement may include a collecting component with a collecting surface. The oil channel for the first gear set may have an opening. The oil channel for the first gear set may have an opening at one end in the oil flow direction. The collecting surface may be configured to collect oil from the opening of the oil channel for the first gear set in the radial direction and direct it in the axial direction to the first gear set.

[0018] The collecting component can be a separate component. The collecting surface can redirect oil flow from the radial direction to the axial direction. The collecting surface can cover the opening of the oil channel for the first gear set in the axial direction. The collecting surface can be arranged radially outside the opening of the oil channel for the first gear set. The opening of the oil channel for the first gear set can be at one end of the oil channel for the first gear set in the oil flow direction.

[0019] In one embodiment, the first gear set may include a first spur gear. The oil guide assembly may include a first pin, which may be configured to support the first spur gear. The collecting component may be configured to guide oil in the axial direction toward the first pin.

[0020] In one embodiment, the first bolt may have a cavity and a recess. The cavity may be open toward the collecting surface. The recess may extend radially from the cavity through the first bolt to an outer side of the first bolt.

[0021] The cavity can be designed as a cylindrical bore in the axial direction in the first pin. The recesses can be designed as cylindrical bores. The diameter of the bores of the recesses can be smaller than the diameter of the bore for the cavity. Several recesses can be evenly distributed in the circumferential direction. Two recesses can be arranged in the radial direction of the first pin. Recesses can be arranged centrally to a bearing of the first spur gear. The collecting component can be designed to conduct oil in the axial direction to the cavity of the first pin.

[0022] In one embodiment, the second gear set may include a second spur gear. The oil guide arrangement may include a second pin, which may be configured to support the second spur gear. The second pin may include a cavity. The cavity of the second pin may be in fluid communication with the oil passage for the second gear set. The cavity of the second pin may be in fluid communication with one end of the oil passage for the second gear set. The second pin may include a recess. The recess may extend radially from the cavity through the second pin to an outer side of the second pin.

[0023] The cavity can be designed as a cylindrical bore extending axially in the second pin. The cavity can be open axially toward the oil channel for the second gear set. The recesses can be designed as cylindrical bores. The diameter of the bores of the recesses can be smaller than the diameter of the bore for the cavity.

[0024] A plurality of recesses can be evenly distributed in the circumferential direction. Two recesses can be arranged in the radial direction of the second pin. Recesses can be arranged centrally with respect to a bearing of the second spur gear. Two recesses can be arranged next to one another in the axial direction. Two bearings arranged next to one another can be provided to support the second spur gear. The recesses arranged next to one another in the axial direction can each be arranged centrally with respect to a bearing. The collecting component can be designed to conduct oil in the axial direction to the cavity of the first pin.

[0025] In one embodiment, the first gear set can be formed by a first planetary gear set with a first planetary gear. The second gear set can be formed by a second planetary gear set with a second planetary gear. The oil guide arrangement can have a first planetary pin. The first planetary pin can form the first pin. The first planetary pin can be designed to support the first planetary gear. The oil guide arrangement can have a second planetary pin. The second planetary pin can form the second pin. The second planetary pin can be designed to support the second planetary gear.

[0026] The first planetary gear can be rotatably mounted on the first planetary pin by means of a bearing, for example, a needle bearing. The second planetary gear can be rotatably mounted on the second planetary pin by means of two adjacently arranged bearings, for example, needle bearings.

[0027] In one embodiment, the oil guide arrangement may include a first planetary carrier. The first planetary carrier may be rotatably mounted by means of a bearing. The first planetary carrier may be rotatably mounted on the wall section. The first planetary carrier may be configured to receive the first planetary pin. The retaining component may be configured to be non-rotatably connected to the first planetary carrier.

[0028] The retaining component can have an elastically deformable undercut. The undercut can have an arcuate cross-section. The undercut can extend in the circumferential direction. The undercut can be configured for connection to a projection of the first planet carrier extending in the circumferential direction. The retaining component can be connected to the first planet carrier in a rotationally fixed manner by means of a screw connection.

[0029] In one embodiment, the oil guide arrangement can include a second planetary carrier. The second planetary carrier can at least partially form the wall section. The second planetary carrier can completely form the wall section. The second planetary carrier can be configured to receive the second planetary pin. The second planetary carrier can form the main oil channel, the oil channel for the rotor bearing, the oil channel for the rotor, the oil channel for the first gear set, and the oil channel for the second gear set.

[0030] In one aspect, a drive unit for a vehicle comprises an electric machine having a rotor, a rotor bearing, a first gear set, a second gear set, a first output shaft, a second output shaft, and an oil guide arrangement according to any one of the preceding embodiments. The rotor is configured to transmit torque to the first gear set. The rotor bearing rotatably supports the rotor. The rotor bearing can rotatably support the rotor on the wall section. The first gear set and the second gear set are mechanically operatively connected to one another such that torque can be transmitted from the first gear set to the second gear set. The first output shaft is configured to output torque from the first gear set. The second output shaft is configured to output torque from the second gear set.

[0031] The first and second gear sets can function as a differential. The first gear set can be formed by a first planetary gear set. The first planetary gear set can have a first sun gear, a first planetary gear, and a first ring gear. The first sun gear can mesh with the first planetary gear. The first planetary gear can mesh with the first ring gear. The second gear set can be formed by a second planetary gear set. The second planetary gear set can have a second sun gear, a second planetary gear, and a second ring gear. The second sun gear can mesh with the second planetary gear. The second planetary gear can mesh with the second ring gear. The first planetary gear set and the second planetary gear set can be arranged in the same plane in the axial direction. The first planetary gear set and the second planetary gear set can be arranged offset from one another in the axial direction.

[0032] In one aspect, a vehicle has drive wheels and a drive unit according to any one of the preceding aspects. The first output shaft is configured to drive one of the drive wheels. The second output shaft is configured to drive another of the drive wheels. Short description of the characters Fig. 1 shows a sectional view of an embodiment of an oil guide arrangement. Fig. 2 shows a further sectional view of the embodiment of the oil guide arrangement. Fig. 3 shows a further sectional view of the embodiment of the oil guide arrangement. Fig. 4 shows a diagram of an embodiment of a drive unit with the oil guide arrangement. Detailed description of embodiments

[0033] Fig. Figure 1 shows a sectional view of an embodiment of an oil guide assembly. The oil guide assembly is applicable to a drive unit 2 with an electric machine having a rotor 71, a rotor bearing 44, a first gear set, in this case a first planetary gear set 10, and a second gear set, in this case a second planetary gear set 20. The oil guide device has a wall section 61 and an oil supply device.

[0034] A main oil channel 90 is formed by the wall section 61. The main oil channel 90 is designed to receive oil from the oil supply device. The oil supply device is an annular space located on an inner circumference of a stationary component 60 of the drive unit 2 at the top of the main oil channel 90 in Fig. 1 extends to the left. The main oil channel 90 is in fluid communication with the oil supply device via a horizontally extending, flat recess. The main oil channel 90 is thus designed to receive oil from the oil supply device.

[0035] An oil channel 91 for the rotor bearing 44 is in fluid communication with the main oil channel 90. An oil channel 92 for the rotor 71 is in fluid communication with the main oil channel 90. An oil channel 93 for the first gear set is in fluid communication with the oil channel 91 for the rotor bearing 44. A Fig. The oil channel 94 described in Figure 3 for the second wheel set is designed to receive oil from the oil supply device.

[0036] Wall section 61 forms the main oil channel 90 and the oil channels for oiling the rotor 71, the rotor bearing 44, the first gear set, and the second gear set. In this case, wall section 61 is formed by a second planet carrier 22 for the second gear set.

[0037] Further details of the oil guide arrangement are described below.

[0038] The main oil channel 90 consists of two cylindrical holes. The first hole extends Fig. 1 in the vertical direction and is located radially outward. The first bore forms an outer section of the main oil channel 90. The second bore of the main oil channel 90 extends obliquely from the lower end of the first bore of the main oil channel 90 toward the rotor bearing 44. The second bore forms an inner section of the main oil channel 90.

[0039] The oil channel 91 for the rotor bearing 44 is formed as an extension of the main oil channel 90. The oil channel 91 for the rotor bearing 44 ends in the oil flow direction at a bearing seat for the rotor bearing 44, which is formed by the wall section 61 and a first sun gear 11 of the first gear set. The oil flow direction of the oil is in Fig. 1 to 3 by dashed arrows. The oil channel 91 for the rotor bearing 44 is in fluid communication with the main oil channel 90 at the same location as the oil channel 92 for the rotor 71. The oil channel 92 for the rotor 71 extends horizontally toward the rotor 71 and is formed by a bore. In other words, the main oil channel 90 branches into the oil channel 91 for the rotor bearing 44 and the oil channel 92 for the rotor 71.

[0040] Adjacent to the bearing seat for the rotor bearing 44, a bearing seat for a bearing 40 of a first planet carrier 12 for the first gear set is formed by the wall section 61 and the first planet carrier 12. At a rear end of the bearing seat for the bearing 40 of the first planet carrier 12, in the oil flow direction, a shoulder for axially positioning the bearing 40 of the first planet carrier 12 is provided. The oil channel 93 for the first gear set has an inner circumference of the shoulder of the wall section 61 and an outer circumference of a section of the first planet carrier 12. The oil channel 93 for the first gear set extends annularly horizontally to the right in the oil flow direction from the bearing seat for the rotor bearing 44 and ends with an opening at a short distance from a radially arranged section of the first planet carrier 12.

[0041] From the opening of the oil channel 93 for the first gear set, the oil escaping in the oil flow direction is conveyed outwards in the radial direction along the first planet carrier 12 due to centrifugal force during operation of the drive unit 2.

[0042] A collecting component 80 is arranged radially outside the opening of the oil channel 93 for the first gear set. The collecting component 80 has a collecting surface. The collecting surface is designed to collect oil from the opening of the oil channel 93 for the first gear set in the radial direction and to direct it axially to the first gear set. The collecting component 80 is designed to be connected in a rotationally fixed manner to the first planet carrier 12. For this purpose, the collecting component 80 has a circumferentially extending undercut with an arcuate cross-section, which can be hooked over a circumferentially extending projection. The projection projects in the radial direction. The guidance of the oil by means of the collecting component 80 is described with reference to Fig. 2 describe in more detail.

[0043] Fig. Figure 2 shows another sectional view of the embodiment of the oil guide assembly. The sectional view extends radially through the first gear set, in this case the first planetary gear set 10. The first gear set has a number of first planet gears 14. One of the first planet gears 14 is rotatably mounted on a first planetary pin 13 of the oil guide assembly by means of a bearing, in this case a needle bearing.

[0044] The first planetary pin 13 has a cavity formed by a bore in the axial direction and open toward the receiving component 80. The first planetary pin 13 has a number of recesses extending from the cavity of the first planetary pin 13 to an outer side of the first planetary pin 13. The recesses are formed by bores that have a significantly smaller diameter than the bore of the cavity. In the present case, two opposing recesses are provided. The recesses are arranged centrally with respect to the bearing of one of the first planetary gears 14.

[0045] The collecting component 80, with its collecting surface, is designed to direct oil in the axial direction to the cavity of the first planetary pin 13. The oil is directed radially to the bearing of one of the first planetary gears 14 via the recesses of the first planetary pin 13.

[0046] In addition to the first sun gear 11 and the first planet gears 14, the first gear set includes a first ring gear 15. The first sun gear 11 meshes with one of the first planet gears 14. One of the first planet gears 14 meshes with the first ring gear 15 and is rotatably mounted on the first planetary pin 13. The first planetary pin 13 is connected to the first planetary carrier 12.

[0047] Fig. Figure 3 shows another sectional view of the embodiment of the oil guide assembly. The sectional view extends radially through the second gear set, in this case the second planetary gear set 20. The second gear set has a number of second planet gears 24. One of the second planet gears 24 is rotatably mounted on a second planetary pin 23 of the oil guide assembly by means of two adjacently arranged bearings, in this case needle bearings.

[0048] The second planetary pin 23 has a cavity formed by a bore in the axial direction and open toward the oil channel 94 for the second gear set. The second planetary pin 23 has a number of recesses extending from the cavity of the second planetary pin 23 to an outer side of the second planetary pin 23. The recesses are formed by bores that have a significantly smaller diameter than the bore of the cavity of the second planetary pin 23. In the present case, two opposing recesses are provided centrally to each of the bearings of the second planetary gear 24.

[0049] The cavity of the second planetary pin 23 is in fluid communication with the oil channel 94 for the second gear set. The oil is directed to one of the second planetary gears 24 via the cavity and the recesses of the second planetary pin 23.

[0050] In addition to the second planetary gears 24, the second gear set includes a second sun gear 21 and a second ring gear 25. The second sun gear 21 meshes with one of the second planetary gears 24. One of the second planetary gears 24 meshes with the second ring gear 25 and is rotatably mounted on the second planetary pin 23. The second planetary pin 23 is connected to the second planetary carrier 22.

[0051] The first ring gear 15 and the second sun gear 21 are formed by a sun ring gear 30. The sun ring gear 30 has the first ring gear 15 on an inner circumference. The sun ring gear 30 has the second sun gear 21 on an outer circumference. The first gear set and the second gear set are arranged in the same plane in the axial direction.

[0052] Fig.Figure 4 shows a diagram of an embodiment of a drive unit 2 with the oil guide arrangement. The rotor 71 is arranged radially within a stator 70 of the electric machine. A first output shaft 5 of the drive unit 2 extends radially within the rotor 71. The first output shaft 5 is connected in a rotationally fixed manner to the first planet carrier 12. A second output shaft 6 of the drive unit 2 is connected in a rotationally fixed manner to the second ring gear 25.

[0053] The wall section 61 is non-rotatably connected to the stationary component 60, in this case a housing. The wall section 61 forms the main oil channel 90, the oil channel 91 for the rotor bearing 44, the oil channel 92 for the rotor 71, the oil channel 93 for the first gear set, and the oil channel 94 for the second gear set. The second planet carrier 22 forms the wall section 61. Reference symbol 2 drive unit 5 First output shaft 6 Second output shaft 10 First planetary gear set 11 First sun gear of the first planetary gear set 12 First planet carrier of the first planetary gear set 13 First planetary pin of the first planetary gear set 14 First planetary gear of the first planetary gear set 15 First ring gear of the first planetary gear set 20 Second planetary gear set 21 Second sun gear of the second planetary gear set 22 Second planet carrier of the second planetary gear set 23 Second planetary pin of the second planetary gear set 24 Second planetary gear of the second planetary gear set 25 Second ring gear of the second planetary gear set 30 sun gear 40 bearings of the first planet carrier 44 rotor bearings 60 Stationary component 61 wall section 70 Stator 71 Rotor 80 Catchment component 90 Main oil channel 91 Oil channel for the rotor bearing 92 Oil channel for the rotor 93 Oil channel for the first wheel set 94 Oil channel for the second wheel set

Claims

[1] Oil guide arrangement for a drive unit (2) with an electric machine having a rotor (71), a rotor bearing (44), a first gear set and a second gear set, wherein the oil guide arrangement has a wall section (61) and an oil supply device, wherein the wall section (61) forms a main oil channel (90), an oil channel (91) for the rotor bearing (44), an oil channel (92) for the rotor (71), an oil channel (93) for the first wheel set and an oil channel (94) for the second wheel set, the main oil channel (90) is designed to receive oil from the oil supply device, the oil channel (91) for the rotor bearing (44) is in fluid communication with the main oil channel (90), the oil channel (92) for the rotor (71) is in fluid communication with the main oil channel (90), the oil channel (93) for the first gear set is in fluid communication with the oil channel (91) for the rotor bearing (44), and the oil channel (94) for the second wheel set is designed to receive oil from the oil supply device. [2] Oil guide arrangement according to claim 1, characterized by that the oil channel (91) for the rotor bearing (44) and the oil channel (92) for the rotor (71) are in fluid communication with the main oil channel (90) at the same position. [3] Oil guide arrangement according to claim 1 or 2, characterized by that the oil channel (93) for the first gear set is in fluid communication with the oil channel (91) for the rotor bearing (44) via at least one bearing seat. [4] Oil guide arrangement according to one of the preceding claims, characterized by , that the oil guide arrangement has a collecting component (80) with a collecting surface, the oil channel (93) for the first wheel set has an opening, and the collecting surface is designed to collect oil from the opening of the oil channel (93) for the first wheel set in the radial direction and to direct it in the axial direction to the first wheel set. [5] Oil guide arrangement according to claim 4, characterized by , that the first gear set has a first spur gear, the oil guide arrangement has a first bolt which is designed to support the first spur gear, and the collecting member (80) is designed to guide oil in the axial direction to the first bolt. [6] Oil guide arrangement according to claim 5, characterized by that the first bolt has a cavity open towards the collecting surface and a recess extending radially from the cavity through the first bolt to an outer side of the first bolt. [7] Oil guide arrangement according to one of the preceding claims, characterized by , that the second gear set has a second spur gear, the oil guide arrangement has a second bolt which is designed to support the second spur gear and has a cavity, the cavity of the second bolt is in fluid communication with the oil channel (94) for the second gear set, and the second bolt has a recess extending radially from the cavity through the second bolt to an outer side of the second bolt. [8] Oil guide arrangement according to one of the preceding claims, characterized by , that the first gear set is formed by a first planetary gear set (10) with a first planetary gear (14), the second gear set is formed by a second planetary gear set (20) with a second planetary gear (24), the oil guide arrangement has a first planetary bolt (13) and a second planetary bolt (23), the first planetary pin (13) forms the first pin and is designed to support the first planetary gear (14), and the second planetary bolt (23) forms the second bolt and is designed to support the second planetary gear (24). [9] Oil guide arrangement according to claim 8, characterized by , that the oil guide arrangement comprises a first planet carrier (12) which is rotatably mounted by means of a bearing (40) and is designed to receive the first planet pin (13), and the collecting component (80) is designed such that it can be connected to the first planet carrier (12) in a rotationally fixed manner. [10] Oil guide arrangement according to claim 8 or 9, characterized by that the oil guide arrangement has a second planet carrier (22) which at least partially forms the wall section (61) and is designed to receive the second planet pin (23). [11] Drive unit (2) for a vehicle with an electric machine having a rotor (71), a rotor bearing (44), a first gear set, a second gear set, a first output shaft (5), a second output shaft (6) and an oil guide arrangement according to one of the preceding claims, wherein the rotor (71) is designed to transmit a torque to the first wheel set, the rotor bearing (44) rotatably supports the rotor (71), the first wheelset and the second wheelset are mechanically connected to each other in such a way that a torque can be transmitted from the first wheelset to the second wheelset, the first output shaft (5) is designed to output a torque from the first gear set, and the second output shaft (6) is designed to output a torque from the second gear set. [12] Vehicle with drive wheels and a drive unit (2) according to claim 11, wherein the first output shaft (5) is designed to drive one of the drive wheels, and the second output shaft (6) is designed to drive another of the drive wheels.

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