VEHICULAR STEERING WHEEL AND COLUMN ASSEMBLY INCLUDING TORSIONAL DAMPER DEVICE

• US 20090301803A1
• Filed: 06/10/2008
• Published: 12/10/2009
• Est. Priority Date: 06/10/2008
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust)
• Inventors: OBLIZAJEK, Kenneth L., WRIGHT, Carl T.
• Granted Patent: US 7,909,361 B2
• Time in Patent Office: Days
• US Class Current: 180/444
• CPC Class Codes: B62D 7/224 acting between the steering wheel and the steering gear, e.g. on the steering column
• CPC Class Codes: F16F 7/04 in the direction of the axis of rotation F16F7/023 takes precedence

Abstract

A steering wheel and column assembly is provided for deployment on a vehicle. In one embodiment, the steering wheel and column assemblies comprises: (i) a steering column housing, (ii) a rotatable steering assembly, and (iii) a torsional damper device. The rotatable steering assembly includes a steering column shaft, which is rotatably coupled to the steering column housing, and a steering wheel, which is fixedly coupled to the steering column shaft. The torsional damper device includes a stator body, which is fixedly coupled to the steering column housing, and a rotor body, which is fixedly coupled to the rotatable steering assembly. The rotor body frictionally engages the stator body to produce a predetermined coulomb torque frictional resistance.

Claims

1. A steering wheel and column assembly for deployment on a vehicle, the steering wheel and column assembly comprising:

a steering column housing;

a rotatable steering assembly, comprising;

a steering column shaft rotatably coupled to the steering column housing; and

a steering wheel fixedly coupled to the steering column shaft; and

a torsional damper device, comprising;

a stator body fixedly coupled to the steering column housing; and

a rotor body fixedly coupled to the rotatable steering assembly, the rotor body frictionally engaging the stator body to produce a predetermined coulomb torque frictional resistance.

2. A steering wheel and column assembly according to claim 1 wherein the steering column shaft extends through the stator body.

3. A steering wheel and column assembly according to claim 2 wherein the steering column shaft extends through the rotor body.

4. A steering wheel and column assembly according to claim 1 wherein the rotor body frictionally engages the stator body along an annular friction interface.

5. A steering wheel and column assembly according to claim 4 wherein the plane of the annular friction interface is substantially orthogonal to the longitudinal axis of the steering column shaft.

6. A steering wheel and column assembly according to claim 4 wherein the inner diameter of the substantially annular friction interface is between approximately 70 millimeters and approximately 110 millimeters.

7. A steering wheel and column assembly according to claim 1 wherein the rotor body frictionally engages the rotor body along a tubular friction interface.

8. A steering wheel and column assembly according to claim 7 wherein the tubular friction interface is substantially coaxial with the steering column shaft.

9. A steering wheel and column assembly according to claim 1 further comprising:

a supplemental inflatable restraint (SIR) module mounted on the steering wheel; and

an elongated electrical conductor electrically coupled to the SIR module and residing between the stator body and the rotor body.

10. A steering wheel and column assembly according to claim 9 wherein the elongated electrical conductor is substantially contained within the torsional damper device.

11. A steering wheel and column assembly according to claim 1 further comprising a resilient element contacting at least one of the rotor body and the stator body to bias the rotor body and the stator body toward each other.

12. A steering wheel and column assembly according to claim 11 wherein the resilient element is integrally formed with the rotor body.

13. A steering wheel and column assembly according to claim 11 wherein the rotor body frictionally engages the stator body along a friction interface, and wherein the resilient element is compliant in a direction normal to the friction interface.

14. A steering wheel and column assembly according to claim 11 wherein the resilient element comprises a spring disposed between the rotor body and the steering wheel.

15. A steering wheel and column assembly according to claim 1 wherein the predetermined coulomb torque frictional resistance is between approximately 0.1 Newton meters and approximately 0.4 Newton meters.

16. A steering wheel and column assembly according to claim 1 wherein the predetermined coulomb torque frictional resistance is between approximately 0.15 Newton meters and approximately 0.25 Newton meters.

17. A steering wheel and column assembly, comprising:

a steering column housing;

a rotatable steering assembly, comprising;

a steering column shaft rotatably coupled to the steering column housing; and

a steering wheel fixedly coupled to the steering column shaft; and

a torsional damper device, comprising;

a stator body fixedly coupled to the steering column housing, the stator body having a first predetermined torsional stiffness;

a rotor body fixedly coupled to the rotatable steering assembly, the rotor body having a second predetermined torsional stiffness; and

a resilient element maintaining the stator body and the rotor body in frictional engagement.

18. A steering wheel and column assembly according to claim 17 wherein the first predetermined torsional stiffness and the second predetermined torsional stiffness are each between approximately 40 Newton meters per degree and approximately 80 Newton meters per degree.

19. A supplemental inflatable restraint (SIR) coil assembly for deployment within a steering wheel and column assembly of the type that includes a steering column housing, a steering column shaft rotatably coupled to the steering column housing, a steering wheel fixedly coupled to the steering column shaft, and an SIR module mounted on the steering wheel, the SIR coil assembly comprising:

a stator body configured to be fixedly coupled to the steering column housing;

a rotor body configured to be fixedly coupled to at least one of the steering wheel and the steering column shaft, the rotor body frictionally engaging the stator body to produce a predetermined coulomb torque frictional resistance between approximately 0.1 Newton meters and approximately 0.4 Newton meters; and

an SIR coil disposed between the stator body and the rotor body and configured to be electrically coupled to the SIR module.

20. An SIR coil assembly according to claim 19 wherein the stator body comprises a raised annular rim, and wherein the rotor body comprises an outer radial lip frictionally engaging the raised annular rim.