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

• US 9,199,527 B2
• Filed: 12/05/2012
• Issued: 12/01/2015
• Est. Priority Date: 12/05/2011
• Status: Active Grant

• Current Assignee: Dr Ing hc F Porsche AG (Volkswagen AG)
• Original Assignee: Dr Ing hc F Porsche AG (Volkswagen AG)
• Inventors: Knoblauch, Daniel
• Primary Examiner(s): KNIGHT, DEREK DOUGLAS
• Application Number:
  US14/363,009
• Publication Number:
  US 20140335999A1
• Time in Patent Office: 1,091 Days
• US Class Current: 1/1
• CPC Class Codes: B60K 1/00 Arrangement or mounting of electrical propulsion units B60K7/00 takes precedence; arrangement or mounting of plural diverse prime-movers for mutual or common propulsion B60K6/00; electric transmission arrangements B60K17/12; electric equipment or propulsion of electrically-propelled vehicles per se B60L; current-collectors for power supply lines of electrically-propelled vehicles B60L5/00
• CPC Class Codes: B60K 1/02 comprising more than one electric motor
• CPC Class Codes: B60K 17/02 characterised by arrangement, location, or kind of clutch
• CPC Class Codes: B60K 17/12 of electric gearing of electrically-actuated clutches B60K17/02
• CPC Class Codes: B60K 17/16 of differential gearing
• CPC Class Codes: B60K 17/165 provided between independent half axles B60K17/18, B60K17/20 take precedence
• CPC Class Codes: B60K 17/24 Arrangements of mountings for shafting
• CPC Class Codes: B60K 17/348 having differential means for driving one set of wheels, e.g. the front, at one speed and the other set, e.g. the rear, at a different speed B60K17/346 takes 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: B60K 23/0808 for varying torque distribution between driven axles, e.g. by transfer clutch
• 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 2220/42 with use of more than one motor
• 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: B60Y 2200/91 : Electric vehicles
• CPC Class Codes: F16H 48/20 : Arrangements for suppressing or influencing the differential action, e.g. locking devices
• 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) having a differential (23), a second axle (3) having a differential (26), and at least one electric machine (11, 32) for driving the two axles (2, 3). The at least one electric machine (11, 32) is arranged transversely to the direction of travel (4) of the motor vehicle and is connected to the first axle (2) of the drive train (1) via a spur gear (12). The first axle (2) and the second axle (3) each have a crown wheel (25). The crown wheels (25) are connected to each other via a shaft (27) that has pinions (28) at its respective ends, which engage into a respective crown wheel (25). The drive train allows retrofitting the drive train with simple construction, from an initial state with only one driven axle to all-wheel drive.

Claims

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

a first axle with a first differential having a first differential housing;

a second axle with a second differential having a second differential housing;

at least one electric machine disposed so that the first axle is between the at least one electric machine and the second axle, the at least one electric machine being configured for driving at least the first axle, the at least one electric machine being arranged transversely with respect to a forward direction of travel of the motor vehicle and being connected to the first axle of the drive train via a spur gearing;

first and second crown wheels disposed respectively on the first and second differential housings; and

a shaft having first and second ends provided respectively with first and second pinions that are engageable respectively with the first and second crown wheels on the first and second differential housings, wherein the shaft is selectively incorporated into the drive train for achieving all-wheel drive of the vehicle without reconfiguring remaining components of the drive train.

2. The drive train of claim 1, wherein the first axle is a rear axle of the motor vehicle.

3. The drive train of claim 2, wherein the at least one electric machine is arranged behind the rear axle.

4. The drive train of claim 1, wherein the drive train is a drive train of a sports car.

5. The drive train of claim 1, wherein the at least one electric machine is the only electric machine in the drive train.

6. The drive train of claim 1, wherein the at least one electric machine is a first electric machine, and wherein the drive train further has a second electric machine disposed so that the first axle is between the second electric machine and the second axle, wherein one of the electric machines can be decoupled from the drive train by a switchable clutch.

7. The drive train of claim 6, wherein the first axle is a rear axle of the motor vehicle and wherein the electric machines are disposed on a common axis parallel to and rearward of the rear axle.

8. The drive train of claim 1, wherein the differential of the first axle is a conventional, open differential or a torque-vectoring differential with a planetary gearing and brakes.

9. The drive train claim 1, wherein the spur gearing has an intermediate shaft between an output shaft of the electric machine or output shafts of the electric machines and the first axle.

10. The drive train of claim 1, wherein the spur gearing is not switchable.

11. The drive train of claim 1, wherein the shaft has a controllable hang-on clutch.

12. The drive train of claim 1, wherein the spur gearing is switchable.