Drive axle for a motor vehicle

Patent metadata

Field	Value
Publication number	US-12384200-B2
Application number	US-202117155451-A
Country	US
Kind code	B2
Filing date	Jan 22, 2021
Priority date	Jan 24, 2020
Publication date	Aug 12, 2025
Grant date	Aug 12, 2025

Abstract

A drive axle ( 1 ) and a motor vehicle having the drive axle ( 1 ) are proposed. The drive axle ( 1 ) includes an axle body ( 2 ) in which at least one axle shaft ( 3 ) extends. The drive axle ( 1 ) has at least one wheel carrier ( 5 ), which is arranged on a wheel-side end ( 4 ) of the axle body ( 2 ), and at least one steering assembly ( 6 ). The drive axle ( 1 ) is preferably in the form of a rigid axle and the axle body ( 2 ) has a receiving structure ( 7 ) for accommodating a drive unit ( 8 ), and the steering assembly ( 6 ) is directly connected to the axle body ( 2 ).

First claim

The invention claimed is:

1. A drive axle for a motor vehicle, the drive axle comprising:
an axle body in which at least one axle shaft extends,
at least one wheel carrier, and the at least one wheel carrier being arranged on a wheel-side end of the axle body,
at least one steering assembly having a drive an actuator that steers the at least one wheel carrier to steer the drive axle,
the axle body further comprising a receiving structure which receives a drive unit, the drive unit driving the at least one axle shaft and the receiving structure being directly connected to and wholly supported by the axle body, and
the steering assembly being directly connected to the axle body centrally along the drive axle.

2. The drive axle according to claim 1 , wherein the drive axle is a rear axle.

3. The drive axle according to claim 1 , wherein the axle body has at least one fork joint which is arranged at the wheel-side end.

4. The drive axle according to claim 1 , wherein the steering assembly comprises the actuator that is coupled to the at least one wheel carrier, the actuator being fixed to the axle body and actuatable to transmit steering movements to the at least one wheel carrier.

5. The drive axle according to claim 4 , wherein the actuator is an electric motor and actuation of the electric motor transmits the steering movements of the actuator, via track rods, to the at least one wheel carrier.

6. The drive axle according to claim 1 , wherein the steering assembly comprises the actuator and at least one spindle transmission, the actuator is rotatable and rotationally drives the at least one spindle transmission which converts rotational movement of the actuator into translation of a track-rod connected to the at least one wheel carrier to bring about steering movement of the at least one wheel carrier.

7. The drive axle according to claim 1 , wherein when the drive axle is viewed from a lateral side of the vehicle, the steering assembly is located behind the axle shaft in relation to a longitudinal direction of the vehicle.

8. The drive axle according to claim 1 , wherein the steering assembly is arranged on the receiving structure.

9. The drive axle according to claim 1 , wherein the axle shaft is a cardan shaft such that the axle shaft has at least one articulated joint.

10. The drive axle according to claim 9 , wherein the at least one articulated joint is one of a universal joint, a double-universal joint or a constant-velocity joint.

11. The drive axle according to claim 1 , further comprising at least one spring device.

12. The drive axle according to claim 11 , wherein the at least one spring device comprises two leaf springs that are secured to the axle body and extend in a longitudinal direction of the vehicle.

13. The drive axle according to claim 1 , further comprising at least one damper which is arranged on the axle body.

14. The drive axle according to claim 1 , wherein the drive unit is arranged in the receiving structure.

15. The drive axle according to claim 14 , wherein the drive unit comprises at least one electric motor, wherein the drive unit and the at least one steering assembly have a common energy supply.

16. The drive axle according to claim 14 , wherein the drive unit comprises an electric motor and is attached by rubber mountings to the receiving structure which is directly connected to the axle body such that the electric motor is located vertically higher than the at least one axle shaft.

17. The drive axle according to claim 14 , wherein the drive unit comprises a distributor gear system which transmits torque from the drive unit to wheels of the drive axle.

18. The drive axle according to claim 14 , wherein the drive axle is a rigid axle.

19. A motor vehicle with a drive axle, wherein the drive axle includes:
an axle body in which at least one axle shaft extends,
at least one wheel carrier, and the wheel carrier being arranged on a wheel-side end of the axle body,
at least one steering assembly having a drive an actuator that comprises an electric motor which is actuatable to steers the at least one wheel carrier,
the axle body comprises a receiving structure for accommodating a drive unit that comprises another electric motor that rotatably drives the at least one axle shaft, and the receiving structure being directly connected to and wholly supported by the axle body, and
the steering assembly is connected directly to the axle body centrally between axially opposite ends of the axle body.

20. A drive axle for a motor vehicle, the drive axle comprising:
an axle body in which at least one axle shaft extends therethrough, at least first and second wheel carriers, the first wheel carrier being arranged on a first wheel-side end of the axle body and the second wheel carrier being arranged on a second wheel-side end of the axle body opposite the first wheel-side end,
a steering assembly having a first electric motor for steering the first and the second wheel carriers,
the axle body further comprising a receiving structure for accommodating a drive unit having a second electric motor that is actuatable to transmit drive torque to the first and the second wheel carriers, and the receiving structure being directly connected to and wholly supported by the axle body so that the steering assembly moves essentially uniformly with the drive axle when the vehicle experiences oscillations,
the axle body having stiffening ribs, adjacent a drive unit recess, in order to ensure the stability required for holding the drive unit,
the steering assembly extending essentially parallel to the axle body, and
the steering assembly being directly connected to the axle body for steering the first and the second wheel carriers, the steering assembly being connected to the axle body at a middle of the drive axle between the first and the second wheel carriers.

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Kontermann Peter
• Berger Frank

Classifications

• B62D5/0421

  Electric motor acting on or near steering gear · CPC title

• B62D5/0445

  Screw drives · CPC title

• B60K2001/001

  one motor mounted on a propulsion axle for rotating right and left wheels of this axle · CPC title

• B60B35/003

  Steerable axles · CPC title

• B60B35/128 Primary

  of the homokinetic or constant velocity type · CPC title