Drive device for axle of motor vehicle

Abstract

The invention relates to a drive device for an axle of a motor vehicle, the drive device having an electric motor (8) which can rotatably drive two half-axles (2) pointing in opposite directions via a switching stage (7) and a differential, wherein wheels are arranged at the ends of the half-axles facing away from the differential. The differential is an axle-centre transmission (1), on one side of the axle-centre transmission facing the half-axles (2) the electric motor (8) is arranged and on the other side of the axle-centre transmission facing the half-axles (2) the switching stage (7) is arranged, wherein the switching stage (7) can be rotatably driven by the electric motor (8) via a through transmission (9) transverse to the axle orientation (3) of the half-axles (2).

Description

Technical Field

[0001] The invention relates to a drive device for an axle of a motor vehicle, which has an electric machine by which two half-axles pointing in opposite directions can be rotatably driven via a shifting stage and a differential, at whose ends facing away from the differential wheels are arranged. Background Art Summary of the invention

[0002] The object of the present invention is to provide a drive device for an axle of a motor vehicle of the type mentioned in the introduction which takes up a small installation space and has a center of gravity which is at least as central as possible between the wheels.

[0003] According to the invention, this object is achieved in that the differential is an axle-centered transmission, an electric motor is arranged on one side of the axle-centered transmission facing the half-bridge, and a shift stage is arranged on the other side of the axle-centered transmission facing the half-bridge, wherein the shift stage can be driven in a rotatable manner by the electric motor via a through transmission portion oriented transversely to the axle of the half-bridge.

[0004] Due to this configuration, only a single electric machine and a single power electronics are required to drive the two half-bridges, which results in a reduction in components as well as in a reduction in installation space and weight.

[0005] Furthermore, the design according to the invention makes it possible to achieve a mass concentration in such a way that the center of gravity is at least largely centered between the two wheels, which results in at least largely uniform loading of the two half-axles and allows at least approximately identical lengths of the half-axles.

[0006] The nearly central arrangement of the electric machine facilitates the current and cooling water supply of the electric machine and the routing of the cables for the various sensors, since their lines, which usually have a large cross section, can be routed with only a small deflection.

[0007] If the motor vehicle has a transmission tunnel, the electric motor, the shifting stage and the axle center transmission can be arranged in the transmission tunnel in a protected manner. This is particularly advantageous in military vehicle applications and in construction vehicles.

[0008] If the axle center gear, the electric machine and the shifting stage are fastened to the frame of the motor vehicle, their weight is jointly damped by the vehicle body and is therefore less stressed.

[0009] In this case, the axle core drive, the electric machine and the shifting stage can form a preassembled structural unit, which simplifies assembly and allows a very compact design.

[0010] Multiple axles of a motor vehicle can have an axle-center gear, on one side of the axle-center gear facing the half-bridge an electric machine is arranged, and on the other side of the axle-center gear facing the half-bridge a shifting stage is arranged, wherein the shifting stage can be rotatably driven by the electric machine via a through-gear oriented transversely to the axle.

[0011] Furthermore, it is also possible to drive a second axle center transmission via a through-transmission via a second shifting stage, and to rotatably drive two second half-axles pointing in opposite directions via the second axle center transmission, wherein the through-transmission leads to a second shifting stage transversely to the axle orientation of the second half-axles, which is arranged on the side of the second axle center transmission facing away from the first shifting stage.

[0012] Thus, both axles can be driven by a single electric motor.

[0013] The through-drive can be rotatably driven by an electric motor via an adjustment stage.

[0014] The speed and / or torque can be controlled via the control stage.

[0015] In a simple and space-saving manner, the regulating stage can be an intermediate stage.

[0016] In a space-saving manner, the auxiliary unit can be rotatably driven by a shaft extending through the gearbox or the first or second shifting stage, wherein the auxiliary unit can be an emergency steering pump of a steering system.

[0017] A parking brake can be arranged on the through-transmission or on the shaft of the first or second shifting stage, by means of which the through-transmission or the shaft of the first or second shifting stage can be blocked in rotation.

[0018] In this case, both the auxiliary units and the parking brake are directly connected to the wheels. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Embodiments of the present invention are shown in the drawings and described in detail below.

[0020] Figure 1 A schematic diagram showing a first exemplary embodiment of a drive device for an axle of a motor vehicle;

[0021] Figure 2 A schematic diagram showing a second exemplary embodiment of a drive device for an axle of a motor vehicle;

[0022] Figure 3 A schematic diagram showing a third exemplary embodiment of a drive device for an axle of a motor vehicle;

[0023] Figure 4A schematic diagram showing a fourth exemplary embodiment of a drive device for an axle of a motor vehicle;

[0024] Figure 5 The schematic diagram shows a fifth exemplary embodiment of a drive device for an axle of a motor vehicle. DETAILED DESCRIPTION

[0025] The drive device shown has an axle center gear 1, by which two half-axles 2 pointing in opposite directions can be rotatably driven in an axle orientation 3, which form a first axle 16. Wheels (not shown) are arranged in a rotationally fixed manner on the ends of the half-axles 2 facing away from the axle center gear 1. The axle center gear 1 is a differential having a drive bevel gear 4 coaxial with the half-axles 2, which can be rotatably driven by an output bevel gear 5. The output bevel gear 5 is arranged in a rotationally fixed manner on the output shaft 6 of the two-gear shifting stage 7.

[0026] An electric motor 8 is arranged on one side of the axle center gear 1, by which a shifting stage 7 arranged on the other side of the axle center gear 1 can be rotatably driven via a through-gear 9. The through-gear 9 is transverse to the axle orientation 3 of the half-axle 2 at right angles thereto and forms an input shaft 10 of the shifting stage 7.

[0027] exist Figure 1 In the embodiment, the through transmission part 9 is directly driven by the motor 8, while in Figures 2 to 5 In the embodiment, the through transmission 9 is driven by the motor 8 via the intermediate stage 11 .

[0028] exist Figure 3 In addition to the shifting stage 7 , an emergency steering pump 12 is arranged which is driven by the output shaft 6 of the shifting stage 7 .

[0029] exist Figure 4 In the embodiment of the present invention, a brake disk 13 is arranged in a rotationally fixed manner at the end of the output shaft 6 of the shifting stage 7 facing away from the axle core transmission, which brake disk 13 can be blocked by a parking brake 14 .

[0030] Both the emergency steering pump 12 and the brake disk 13 are connected to the wheels in a play-free manner via the axle center gear 1 and the half-axle 2 .

[0031] exist Figure 5 In the embodiment, the input shaft 10 of the shifting stage 7 is connected in a rotationally fixed manner via a Cardan shaft 15 to a second through-transmission 17 which is transversely connected at right angles to a second axle orientation 18 of two second half-bridges 26 oriented opposite to one another and forming a second axle 19 .

[0032] The second through-drive 17 forms the second input shaft 21 of the second shifting stage 20 of the second gear.

[0033] The second output bevel gear 23 of the second shifting stage 20 is arranged rotationally fixed on the second output shaft 22, via which the second drive bevel gear 24 of the second axle center gear 25 can be driven. The second axle center gear 25 is a differential, via which the two second half-axles 26 of the second axle 19 can be rotatably driven.

[0034] A second wheel (not shown) is arranged in a rotationally fixed manner at the end of the second half-axle 26 facing away from the second axle center gear 25 .

[0035] Reference numerals list

[0036] 1 Axle center drive

[0037] 2 First Half Bridge

[0038] 3 Axle orientation

[0039] 4 Drive bevel gear

[0040] 5 Output bevel gear

[0041] 6 Output shaft

[0042] 7 Switching level

[0043] 8 Output shaft

[0044] 9 Through transmission

[0045] 10 Input shaft

[0046] 11 Intermediate

[0047] 12 Emergency steering pump

[0048] 13 Brake disc

[0049] 14 Parking brake

[0050] 15 Cardan shaft

[0051] 16 First Axle

[0052] 17 Second through transmission unit

[0053] 18 Second axle orientation

[0054] 19 Second axle

[0055] 20 Second switching level

[0056] 21 Second input shaft

[0057] 22 Second output shaft

[0058] 23 Second output bevel gear

[0059] 24 Second drive bevel gear

[0060] 25 Second axle center transmission

[0061] 26 Second Half Bridge

Claims

1. A drive device for an axle (16) of a motor vehicle, the drive device having an electric motor (8) by which two half-axles (2) pointing in opposite directions can be rotatably driven via a first switching stage (7) and a differential, wherein wheels are arranged at the ends of the half-axles facing away from the differential, characterized in that: The differential is an axle center transmission (1), on one side of the axle center transmission facing the half-bridge (2) the electric motor (8) is arranged, and on the other side of the axle center transmission facing the half-bridge (2) the first switching stage (7) is arranged, wherein the first switching stage can be driven in a rotatable manner by the electric motor (8) via a through transmission (9) transverse to the axle orientation (3) of the half-bridge (2), wherein the through transmission (9) can drive a second axle center transmission (25) via a second switching stage (20), and two axle center transmissions with opposite directions can be driven in a rotatable manner via the second axle center transmission The invention relates to a second half-bridge (26) having a through-drive mechanism (9), wherein the through-drive mechanism (9) leads to a second shifting stage (20) transversely to the second axle orientation (18) of the second half-bridge (26), the second shifting stage being arranged on the side of the second axle central transmission (25) facing away from the first shifting stage (7), and wherein the input shaft (10) of the first shifting stage (7) is connected to the second through-drive mechanism (17) via a cardan shaft (15) in a rotationally fixed manner, the second through-drive mechanism (17) being transversely to the second axle orientation (18) of two second half-bridges (26) pointing in opposite directions, the two second half-bridges pointing in opposite directions forming a second axle (19).

2. The driving device according to claim 1, characterized in that: The axle center transmission (1), the electric machine (8) and the first switching stage (7) are fastened to the frame of the motor vehicle.

3. The driving device according to claim 2, characterized in that: The axle center gear (1), the electric machine (8) and the first shifting stage (7) form a preassembled structural unit.

4. The drive device according to any one of claims 1 to 3, characterized in that A plurality of axles of the motor vehicle have an axle-center gear, on one side of which the electric machine is arranged facing the half-bridges, and on the other side of which the axle-center gear is arranged facing the half-bridges, a shifting stage is arranged, wherein the shifting stage can be rotatably driven by the electric machine via a through-gear oriented transversely to the axle.

5. The driving device according to any one of claims 1 to 3, characterized in that: The through transmission part (9) can be driven in a rotatable manner by the electric motor (8) via an adjustment stage.

6. The driving device according to claim 5, characterized in that The adjustment stage is an intermediate stage (11).

7. The driving device according to claim 1, characterized in that: The auxiliary unit can be driven in a rotatable manner by the through-drive (9) or the shaft (6, 22) of the first switching stage (7) or the second switching stage (20).

8. The driving device according to claim 7, characterized in that The additional unit is an emergency steering pump (12) of the steering system.

9. The driving device according to claim 1, characterized in that: A parking brake (14) is arranged on the through-drive (9) or on the shaft (6) of the first switching stage (7) or the second switching stage, by means of which the through-drive (9) or the shaft (6) of the first switching stage (7) or the second switching stage can be rotationally blocked.

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