Steering device

1. A steering device comprising:

a housing including a steering shaft receiving space, and a seal member receiving space;

an input shaft made from a metal, the input shaft including:

an input shaft main body portion, which is rotatably received in the steering shaft receiving space, which includes an input shaft first end portion and an input shaft second end portion that are both end portions in a rotation axis direction of the input shaft main body portion, and which includes an input shaft first region that includes the input shaft first end portion, and that protrudes from the housing, and an input shaft second region that includes the input shaft second end portion, and that is received within the steering shaft receiving space,

a torsion bar insertion hole which is provided within the input shaft main body portion, and which extends from the input shaft second end portion to the input shaft first end portion,

an input shaft retaining pin insertion hole which is provided in the input shaft first region, which extends across the torsion bar insertion hole in a radial direction of the input shaft main body portion, and

a first input shaft seal portion provided in the input shaft first region between the input shaft first end portion and the input shaft retaining pin insertion hole in the rotation axis direction of the input shaft main body portion;

an output shaft rotatably provided within the steering shaft receiving space;

a torsion bar including a torsion bar first end portion and a torsion bar second end portion which are a pair of end portions, including a torsion bar first region including the torsion bar first end portion, and a torsion bar second region including the torsion bar second end portion, the torsion bar including:

a torsion bar first fixing portion which is provided in the torsion bar first region, and which includes a torsion bar retaining pin insertion hole extending in the radial direction of the input shaft main body portion, and extending in series with the input shaft retaining pin insertion hole, and

a torsion bar second fixing portion provided in the torsion bar second region, and connected to the output shaft;

a retaining pin which is inserted into the input shaft retaining pin insertion hole and the torsion bar retaining pin insertion hole, and which connects the input shaft and the torsion bar;

a seal member provided within the seal member receiving space;

a transmitting shaft arranged to turn steered wheels in accordance with the rotation of the output shaft;

an actuator arranged to provide a steering force to the output shaft in accordance with a torsion amount of the torsion bar; and

an input shaft cover including:

a first input shaft cover main body portion having a cylindrical shape, and surrounding a portion of the input shaft first region which is closer to the input shaft second end portion than the first input shaft seal portion in the rotation axis direction of the input shaft main body portion, and

a first input shaft cover seal portion provided to the first input shaft cover main body portion, abutted on the first input shaft seal portion, and arranged to suppress moisture from entering between the input shaft and the input shaft cover,

wherein the input shaft cover includes a first input shaft cover member and a second input shaft cover member which is press-fit into the first input shaft cover member.

2. The steering device as claimed in claim 1 , wherein the input shaft cover includes a second input shaft cover seal portion provided between the first input shaft cover seal portion and the seal member in the rotation axis direction of the input shaft main body portion.

3. The steering device as claimed in claim 1 , wherein the first input shaft cover member surrounds a predetermined axial range of the input shaft first region which includes the first input shaft seal portion in the rotation direction of the input shaft main body, and the second input shaft cover member is closer to the input shaft second end portion than to the first input shaft cover member in the rotation axis direction of the input shaft main body portion.

4. The steering device as claimed in claim 3 , wherein the first input shaft cover member includes a first input shaft cover member abutment portion; the second input shaft cover member includes a second input shaft cover member abutment portion, and includes a second input shaft cover member first end portion and a second input shaft cover member second end portion which are both end portions in the rotation axis direction of the input shaft main body portion; the second input shaft cover member first end portion is closer to the input shaft first end portion than the second input shaft cover member second end portion; a predetermined region of the second input shaft cover member including the second input shaft cover member abutment portion and the second input shaft cover member first end portion is inserted into the first input shaft cover member in the rotation axis direction of the input shaft main body portion; and the second input shaft cover member abutment portion is abutted on the first input shaft cover member abutment portion with an interference.

5. The steering device as claimed in claim 4 , wherein the second input shaft cover member includes a second input shaft cover seal portion provided between the first input shaft cover seal portion and the seal member in the rotation axis direction of the input shaft main body portion, at a position at which the second input shaft cover seal portion is overlapped with the second input shaft cover member abutment portion in the rotation axis direction of the input shaft main body portion.

6. The steering device as claimed in claim 3 , wherein the second input shaft cover member includes a second input shaft cover member first end portion and a second input shaft cover member second end portion which are a pair of end portions in the rotation axis direction of the input shaft main body portion; the second input shaft cover member first end portion is closer to the input shaft first end portion than the second input shaft cover member second end portion; and a predetermined region of the second input shaft cover member which includes the second input shaft cover member first end portion is inserted into the first input shaft cover member in the rotation axis direction of the input shaft main body portion.

7. The steering device as claimed in claim 6 , wherein the first input shaft cover main body portion has a cylindrical shape, the first input shaft cover member includes a first input shaft cover member flange portion; the input shaft main body portion includes a first input shaft cover member first end portion and a first input shaft cover member second end portion which are both end portions in the rotation axis direction of the input shaft main body portion; the first input shaft cover member second end portion is closer to the input shaft second end portion than the first input shaft cover member first end portion; the first input shaft cover member flange portion is formed in a predetermined region including the first input shaft cover member second end portion; and the first input shaft cover member flange portion protrudes from the first input shaft cover main body portion in a radially outward direction of the input shaft main body portion.

8. The steering device as claimed in claim 6 , wherein the first input shaft cover member includes a first input shaft cover member taper portion opened on the first input shaft cover member second end portion of the first input shaft cover member; and the first input shaft cover member taper portion increases in diameter toward the first input shaft cover member second end portion.

9. The steering device as claimed in claim 8 , wherein the first input shaft cover member includes a first input shaft cover member abutment portion; the second input shaft cover member includes a second input shaft cover member abutment portion provided in the first input shaft cover taper portion; the first input shaft cover member is abutted on the second input shaft cover member abutment portion at the first input shaft cover member abutment portion; and the first input shaft cover member is apart from the second input shaft cover member in a region closer to the input shaft first end portion than the first input shaft cover abutment portion in the rotation axis direction of the input shaft main body portion.

10. The steering device as claimed in claim 3 , wherein the first input shaft cover member and the second input shaft cover member are made from the same material.

11. The steering device as claimed in claim 3 , wherein the first input shaft cover member is apart from the input shaft in the radial direction of the input shaft main body portion, in a region which is closer to the input shaft second end portion than the first input shaft cover seal portion in the rotation axis direction of the input shaft main body portion.

12. The steering device as claimed in claim 1 , wherein the input shaft cover is arranged to rotate as a unit with the input shaft in accordance with the rotation of the input shaft.

13. The steering device as claimed in claim 1 , wherein the input shaft is arranged to be connected through a universal joint to a steering wheel side steering shaft connected to a steering wheel;

the universal joint has an outside diameter greater than an outside diameter of the input shaft by a first length;

the input shaft cover includes an input shaft cover first end portion and an input shaft cover second end portion which are both end portions in the rotation axis direction of the input shaft main body;

the input shaft cover first end portion is closer to the input shaft first end portion that the input shaft cover second end portion; and

a clearance between the universal joint and the input shaft cover first end portion is set to be smaller than the first length.

14. The steering device as claimed in claim 1 , wherein the input shaft cover includes an input shaft cover first end portion and an input shaft cover second end portion which are both end portions in the rotation axis direction of the input shaft main body portion; the first input shaft cover first end portion is closer to the input shaft first end portion; and the first input shaft cover seal portion is closer to the input shaft first end portion than the input shaft cover second end portion so as to have a predetermined length between the input shaft first end portion and the input shaft first end portion in the rotation axis direction of the input shaft main body portion.

15. The steering device as claimed in claim 1 , wherein the input shaft cover is provided to the input shaft without providing other members between the input shaft and the input shaft cover.