Drive train of a purely electrically all-wheel drivable motor vehicle

• US 9,096,126 B2
• Filed: 11/27/2012
• Issued: 08/04/2015
• Est. Priority Date: 12/05/2011
• Status: Active Grant

• Current Assignee: Dr Ing hc F Porsche AG (Volkswagen AG)
• Original Assignee: Dr. Ing. H.C.F. Porsche Ag
• Inventors: Knoblauch, Daniel
• Primary Examiner(s): Hurley, Kevin
• Application Number:
  US14/359,675
• Publication Number:
  US 20140284130A1
• Time in Patent Office: 980 Days
• US Class Current: 1/1
• CPC Class Codes: B60K 1/02 comprising more than one electric motor
• CPC Class Codes: B60K 17/165 provided between independent half axles B60K17/18, B60K17/20 take precedence
• CPC Class Codes: B60K 17/35 including arrangements for suppressing or influencing the power transfer, e.g. viscous clutches differential gearing with locking devices F16H48/20
• CPC Class Codes: B60K 17/356 having fluid or electric motor, for driving one or more wheels disposition of motor in, or adjacent to, traction wheel B60K7/00
• CPC Class Codes: B60K 2001/001 one motor mounted on a propulsion axle for rotating right and left wheels of this axle
• CPC Class Codes: B60L 15/2036 Electric differentials, e.g. for supporting steering vehicles
• CPC Class Codes: B60L 15/2054 by controlling transmissions or clutches
• CPC Class Codes: B60L 2220/46 Wheel motors, i.e. motor connected to only one wheel
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/486 Operating parameters
• CPC Class Codes: B60L 2260/28 Four wheel or all wheel drive
• CPC Class Codes: B60L 50/52 characterised by DC-motors
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

A drive train (1) of a purely electrically all-wheel drivable motor vehicle has a first axle (2) with axle halves (7, 8) and a differential (9) connecting them, a second axle (3) with axle halves (4, 5) and a differential connecting them, and first and second electric machines (19, 20) for driving the axles (2, 3). The first electric machine (19) is connected via a first transmission (24) to one axle half (7) of the the first axle (2) and the second electric machine (20) is connected via a second transmission (25) to the other axle half (8) of the first axle (2). The two differentials (6, 9) are connected to each other via a shaft (13). The drive train provides an all-wheel drive with simple construction, and standardization.

Claims

1. A drive train of a purely electrically all-wheel drivable motor vehicle, comprising:

a rear axle that has first and second rear axle halves and a rear differential connecting the rear axle halves, a front axle that has first and second front axle halves and a front differential connecting the front axle halves, and first and second electric machines arranged behind the rear axle of the motor vehicle for driving the front and rear axles, the first electric machine being connected via a first gearing to the first rear axle half of the rear axle and the second electric machine being connected via a second gearing to the second rear axle half of the rear axle, and the front and rear differentials are connected via a shaft.

2. The drive train of claim 1, wherein the two electric machines are arranged transversely with respect to a direction of travel of the motor vehicle.

3. The drive train of claim 2, axes of rotation of rotors of the electric machines are identical.

4. The drive train of claim 1, wherein the respective gearing has a spur gear toothing, and the respective electric machine is connected via the spur gear toothing to the associated axle half of the rear axle.

5. The drive train of claim 1 to, wherein the differential of the rear axle and/or the differential of the front axle has a crown wheel.

6. The drive train of claim 5, wherein the two crown wheels are connected to each other via the shaft, wherein outer end regions of the shaft have pinions that interact with the crown wheels.

7. A drive train of a purely electrically all-wheel drivable motor vehicle, comprising:

a first axle that has left and right first axle halves and a differential connecting the left and right first axle halves, a second axle that has left and right second axle halves and a differential connecting the left and right second axle halves, and first and second electric machines for driving the first and second axles, the first electric machine being connected via a first gearing to the left first axle half of the first axle and the second electric machine being connected via a second gearing to the right first axle half of the first axle, and the two differentials are connected via a shaft, wherein the shaft has a controllable clutch.

8. The drive train of claim 7, wherein the first axle is a rear axle of the motor vehicle.

9. The drive train of claim 8, wherein the two electric machines are arranged behind the rear axle of the motor vehicle.

10. A drive train of a purely electrically all-wheel drivable motor vehicle, comprising:

a first axle that has left and right first axle halves and a differential connecting the left and right first axle halves, a second axle that has left and right second axle halves and a differential connecting the left and right second axle halves, and first and second electric machines for driving the first and second axles, the first electric machine being connected via a first gearing to the left first axle half of the first axle and the second electric machine being connected via a second gearing to the right first axle half of the first axle, and the two differentials are connected via a shaft, wherein the two axle halves of the first axle are mounted one in the other by needle bearings.

11. The drive train of claim 10, wherein the two axle halves of the first axle are mounted in regions of outer sides of the housing shells.

12. A drive train of a purely electrically all-wheel drivable motor vehicle, comprising:

a first axle that has left and right first axle halves and a differential connecting the left and right first axle halves, a second axle that has left and right second axle halves and a differential connecting the left and right second axle halves, and first and second electric machines for driving the first and second axles, the first electric machine being connected via a first gearing to the left first axle half of the first axle and the second electric machine being connected via a second gearing to the right first axle half of the first axle, and the two differentials are connected via a shaft, wherein the two gearings and the differential of the first axle have a common housing with two housing shells.

13. A drive train of a purely electrically all-wheel drivable motor vehicle, comprising:

a first axle that has left and right first axle halves and a differential connecting the left and right first axle halves, a second axle that has left and right second axle halves and a differential connecting the left and right second axle halves, and first and second electric machines for driving the first and second axles, the first electric machine being connected via a first gearing to the left first axle half of the first axle and the second electric machine being connected via a second gearing to the right first axle half of the first axle, and the two differentials are connected via a shaft, wherein the respective gearing, has an intermediate shaft between a driven shaft of the electric machine assigned to said gearing and the axle half assigned to the electric machine, of the first axle, and wherein the intermediate shafts of the two gearings are mounted one in the other by needle bearings.

14. The drive train of claim 13, wherein the two intermediate shafts are mounted in the gearing shells, in a region of outer sides thereof.