Motor-driven steering apparatus

Abstract

In a motor-driven steering apparatus structured such that a motor-driven steering assist unit is interposed between a steering shaft in a handle side and a wheel side steering member, and an input shaft connected to the steering shaft of the motor-driven steering assist unit and an output shaft connected to the wheel side steering member are coupled by a torsion bar and arranged on the same center axis, reference angle position marks are applied to portions existing at the same angle position around the same center axis of the input shaft and the output shaft, in a neutral steering state in which a steering force is not applied to the input shaft of the motor-driven steering assist unit.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be more fully understood from the detailed description given below and from the accompanying drawings which should not be taken to be a limitation on the invention, but are for explanation and understanding only.

The drawings:

FIG. 1 is a schematic view showing a saddle riding type vehicle;

FIG. 2 is a schematic view showing a motor-driven steering apparatus;

FIG. 3 is a schematic view showing a motor-driven steering assist unit;

FIG. 4 is a cross sectional view along a line IV-IV in FIG. 3; and

FIG. 5 is a cross sectional view along a line V-V in FIG. 3.

Claims

1. A motor-driven steering apparatus comprising a motor-driven steering assist unit is interposed between a steering shaft in a handle side and a wheel side steering member, and an input shaft connected to the steering shaft of the motor-driven steering assist unit and an output shaft connected to the wheel side steering member are coupled by a torsion bar and arranged on the same center axis, wherein reference angle position marks are applied to portions existing at the same angle position around the same center axis of the input shaft and the output shaft, in a neutral steering state in which a steering force is not applied to the input shaft of the motor-driven steering assist unit.

2. A motor-driven steering apparatus as claimed in claim 1, wherein the reference angle position mark provided in the input shaft of the motor-driven steering assist unit comprises one differentiated tooth portion formed in a serration of the input shaft, and the reference angle position mark provided in the output shaft of the motor-driven steering assist unit comprises one differentiated tooth portion formed in a serration of the output shaft.

3. A motor-driven steering apparatus as claimed in claim 1, wherein the handle comprises a bar handle.

4. A motor-driven steering apparatus as claimed in claim 2, wherein the handle comprises a bar handle.

5. A motor-driven steering apparatus as claimed in claim 1, wherein the reference angle position marks comprise pain marks respectively provided in the input shaft and the output shaft of the motor-driven steering assist unit.

6. A motor-driven steering apparatus as claimed in claim 1, wherein the reference angle position marks comprise engraved marks respectively provided in the input shaft and the output shaft of the motor-driven steeling assist unit.

7. A saddle riding type vehicle using the motor-driven steering assist apparatus as claimed in claim 1.

8. A saddle riding type vehicle using the motor-driven steering assist apparatus as claimed in claim 2.

9. A saddle riding type vehicle using the motor-driven steering assist apparatus as claimed in claim 3.

10. A saddle riding type vehicle using the motor-driven steering assist apparatus as claimed in claim 4.

11. A saddle riding type vehicle using the motor-driven steering assist apparatus as claimed in claim 5.

12. A saddle riding type vehicle using the motor-driven steering assist apparatus as claimed in claim 6.