Steering device

1. A steering device for steering a vehicle, the steering device comprising:

a movable member configured to move along with a shaft member in an axial direction of the shaft member and to rotatably support the shaft member, the shaft member being connected, at a rear end of the shaft member in a front-rear direction of the vehicle, to an operating member;

a holding member configured to hold the movable member so as to move in the axial direction;

an impact absorbing member connected to the movable member, the impact absorbing member being configured to absorb impact as a front end portion of at least one of the shaft member and the movable member in the front-rear direction of the vehicle moves frontward in the axial direction inside a space for movement;

a movement driving unit configured to move the movable member along the axial direction so as to change a position of the movable member in the axial direction in a vehicle body of the vehicle; and

a controller, the controller being configured to perform first control and second control by which the movement driving unit is controlled, the first control being a control for moving the movable member along the axial direction within such a range that the front end portion is located rearward of the space for movement in the front-rear direction of the vehicle, and the second control being a control for moving the movable member along the axial direction within such a range that the front end portion is located inside the space for movement, wherein:

the holding member includes a base member that is fixed to the vehicle body, and an intermediate member that is held by the base member so as to move in the axial direction and configured to hold the movable member so as to move in the axial direction;

the movement driving unit includes a first driving part that moves the intermediate member relative to the base member, and a second driving part that moves the movable member relative to the intermediate member; and

the controller is configured to control the first driving part in the first control so as to move the intermediate member relative to the base member in a state where the front end portion is located rearward of the space for movement in the front-rear direction of the vehicle, and configured to control the second driving part in the second control so as to move the movable member frontward in the front-rear direction of the vehicle within such a range that the front end portion is located inside the space for movement.

2. The steering device according to claim 1 , wherein the controller is configured to allow the second control to start when it is determined that there is no need to absorb impact by the impact absorbing member.

3. The steering device according to claim 2 , wherein the controller is configured to determine that there is no need to absorb impact by the impact absorbing member when the operating member is located frontward of a predetermined position in the front-rear direction of the vehicle.

4. The steering device according to claim 3 , further comprising an airbag housing part, wherein:

the airbag housing part is configured to move along with the shaft member in the axial direction and to house an airbag so as to allow the airbag to deploy; and

the predetermined position is a position at which the airbag becomes unable to fulfill an expected function.

5. The steering device according to claim 2 , wherein the controller is configured to determine that there is no need to absorb impact by the impact absorbing member when a running state of the vehicle meets a predetermined condition.

6. The steering device according to claim 1 , wherein:

the controller is configured to change, according to a running state of the vehicle, a length of the space for movement in the axial direction that is stored in a predetermined storage area; and

the controller is configured to perform the first control and the second control using the changed length in the axial direction.

7. The steering device according to claim 1 , wherein the controller is configured to change, according to a running state of the vehicle, a length of the space for movement in the axial direction by controlling the movement driving unit.

8. The steering device according to claim 1 , further comprising a stopper, wherein the stopper is configured to restrain the movable member from falling off the holding member by coming into contact with at least one of the shaft member and the movable member after the impact absorbing member starts to absorb impact.

9. The steering device according to claim 8 , wherein the stopper includes at least one of a front stopper that is configured to restrict frontward movement of the shaft member and the movable member and a rear stopper that is configured to restrict rearward movement of the shaft member and the movable member.

10. The steering device according to claim 9 , wherein the at least one of the front stopper and the rear stopper includes a buffer member that is disposed at such a position as to come into contact with at least one of the shaft member and the movable member.

11. A steering device for steering a vehicle, the steering device comprising:

a movable member configured to move along with a shaft member in an axial direction of the shaft member and to rotatably support the shaft member, the shaft member being connected, at a rear end of the shaft member in a front-rear direction of the vehicle, to an operating member;

a holding member configured to hold the movable member so as to move in the axial direction;

an impact absorbing member connected to the movable member, the impact absorbing member being configured to absorb impact as a front end portion of at least one of the shaft member and the movable member in the front-rear direction of the vehicle moves frontward in the axial direction inside a space for movement;

a movement driving unit configured to move the movable member along the axial direction so as to change a position of the movable member in the axial direction in a vehicle body of the vehicle;

a controller, the controller being configured to perform first control and second control by which the movement driving unit is controlled, the first control being a control for moving the movable member along the axial direction within such a range that the front end portion is located rearward of the space for movement in the front-rear direction of the vehicle, and the second control being a control for moving the movable member along the axial direction within such a range that the front end portion is located inside the space for movement; and

a stopper that is configured to restrain the movable member from falling off the holding member by coming into contact with at least one of the shaft member and the movable member after the impact absorbing member starts to absorb impact.

12. The steering device according to claim 11 , wherein the stopper includes at least one of a front stopper that is configured to restrict frontward movement of the shaft member and the movable member and a rear stopper that is configured to restrict rearward movement of the shaft member and the movable member.

13. The steering device according to claim 12 , wherein the at least one of the front stopper and the rear stopper includes a buffer member that is disposed at such a position as to come into contact with at least one of the shaft member and the movable member.