STEER-BY-WIRE STEERING SYSTEM HAVING AN ELECTROMECHANICAL STEERING LOCK

• US 20120205183A1
• Filed: 10/28/2010
• Published: 08/16/2012
• Est. Priority Date: 11/06/2009
• Status: Active Grant

• Current Assignee: ThyssenKrupp Presta AG (Thyssenkrupp AG)
• Original Assignee: ThyssenKrupp Presta AG (Thyssenkrupp AG)
• Inventors: Rombold, Manfred
• Granted Patent: US 8,752,664 B2
• Time in Patent Office: Days
• US Class Current: 180/402
• CPC Class Codes: B60R 25/02 operating on the steering mechanism
• CPC Class Codes: B62D 5/0424 the axes of motor and final driven element of steering gear, e.g. rack, being parallel
• CPC Class Codes: B62D 5/0448 Ball nuts

Abstract

The invention relates to a steering device for a road vehicle according to the steer-by-wire principle with a steering wheel that can be operated by a driver and with a steering gearbox that is not permanently mechanically coupled in a forcible manner, which is equipped with an electric motor drive for swivelling steered wheels, wherein the electric motor drive comprises an electric motor, a pinion (1), a belt (2) and a belt pulley (3), wherein the belt pulley (3) is coupled via the gearbox to a threaded spindle (4), and wherein an electromechanical blocking of the electric motor drive is provided on or in the steering gear.

Claims

1. A steering device for a road vehicle according to the steer-by-wire principle including:

a steering wheel arranged can be operated by a drive;

a steering gear that is not permanently mechanically coupled to the steering wheel, and which includes an electric motor drive configured for swivelling steered wheels, wherein the electric motor drive comprises an electric motor and a gearbox, wherein an electromechanical locking device of the electric motor drive is provided on or in the steering gear.

2. The steering device according to claim 1, wherein the gearbox comprises a pinion, a belt and a belt pulley, wherein the belt pulley is coupled via the gearbox to a threaded spindle.

3. The steering device according to claim 2, wherein the steering system comprises a recirculating ball system for converting the rotational movement of a toothed belt gear into a linear movement of the threaded spindle, and wherein a locking element is provided for blocking the toothed belt gear.

4. The steering device according to claim 1, further comprising a brake shoe configured to is be pressed in the radial direction against a belt drive of the steering system.

5. The steering device according to claim 4, wherein the brake shoe is configured to can be operated via a cam and a return spring.

6. The steering device according to claim 2, wherein teeth specifically for the locking device are arranged on the outside of the toothed belt.

7. The steering device according to claim 1, further including a catch lug or a locking bolt configured to be electromechanically inserted into correspondingly adapted radial recesses or axially parallel recesses of a belt pulley or of a ball nut.

8. The steering device according to claim 4, wherein the belt drive includes at least one of a belt pulley or a ball nut, and wherein the brake shoe is configured to be pressed against the belt pulley or the ball nut.