Work vehicle

1. A work vehicle comprising:

a steering column which is arranged in front of a control seat which is provided on a travel machine body; and

a control steering wheel which has an approximately round shape in a plan view and is arranged in an upper end side of a steering wheel shaft which protrudes upward out of an upper surface of the steering column,

wherein the control steering wheel is constructed by spokes which are axially supported to the steering wheel shaft, and a steering wheel which is arranged in an outer side of the spokes,

wherein the steering wheel shaft extends along a steering wheel shaft axis, the steering wheel shaft axis extending through the upper surface of the steering column, and

wherein a plurality of switches are arranged at positions which are on the upper surface of the steering column and correspond to an area surrounded by the spokes and the steering wheel in the control steering wheel at a straight traveling position.

2. The work vehicle according to claim 1 , wherein:

a meter panel is fixed to a dash board, and

the spokes of the control steering wheel are arranged in a Y-shaped form, and the meter panel is positioned between the spokes in the control steering wheel at the straight traveling position, thereby arranging the meter panel in a field of vision of an operator under a straight traveling work posture.

3. The work vehicle according to claim 2 , wherein:

the dash board comprises an inside board to which the meter panel is fixed, and an outside cover which is fixed so as to cover the inside board from an upper side, and

the inside board is provided with an opening portion in which a display surface of the meter panel is arranged, and a side wall which is obtained by upraising an outer peripheral portion of the opening portion, and is formed into a shape in which an outer side of the display surface of the meter panel is formed by the side wall.

4. The work vehicle according to claim 1 , wherein:

the control steering wheel is constructed by a steering wheel main body which is axially supported to the steering wheel shaft, a hub cover which covers an upper surface of a hub in a center portion of the steering wheel main body, and a cap which covers an upper surface of the hub cover,

a first contact point of an alarm switch is provided in the cap, a second contact point of the alarm switch is provided in the hub cover, and

the first contact point is electrically connected to a boss which is provided at a position of an axial center of the steering wheel main body and fitted to the steering wheel shaft, and the second contact point is electrically connected to a slip ring which is provided in a lower surface of the hub in the steering wheel main body and insulated from the boss.

5. The work vehicle according to claim 1 , wherein the steering column comprises:

a left side surface extending from the upper surface;

a right side surface extending from the upper surface; and

one or more levers extending from each of the left side surface and the right side surface.

6. The work vehicle according to claim 5 , wherein at least a portion of the left side surface is substantially perpendicular to the upper surface, and a portion of the right side surface is substantially perpendicular to the upper surface.

7. The work vehicle according to claim 5 , wherein at least a portion of the left side surface of the steering column is parallel to the steering wheel shaft axis, and at least a portion of each of the right side surface of the steering column is parallel to the steering wheel shaft axis.

8. The work vehicle according to claim 1 , wherein the steering wheel shaft axis extends along a back-and-forth direction of the travel machine body.

9. The work vehicle according to claim 1 , wherein:

the control steering wheel is configured to rotate about the steering wheel shaft axis; and

the upper surface is planar and the steering wheel shaft axis passes through a central portion of the upper surface.

10. The work vehicle according to claim 9 , wherein the upper surface is arranged orthogonal to the steering wheel shaft axis.

11. A work vehicle comprising:

a steering column configured to be positioned in front of a control seat of a travel machine body, the steering column comprising:

an upper surface; and

a side surface;

a steering wheel shaft which extends along a steering wheel shaft axis and protrudes upward out of the upper surface of the steering column;

a control steering wheel coupled to an upper end of the steering wheel shaft and configured to rotate about the steering wheel shaft axis, the control steering wheel comprising:

spokes that are axially supported to the steering wheel shaft; and

a steering wheel coupled to an outer side of the spokes and that circumscribes the spokes, the spokes and the steering wheel define one or more openings; and

a plurality of switches provided on the upper surface of the steering column; and

wherein the plurality of switches are configured to be visible through at least one of the one or more openings based on the control steering wheel being at a straight traveling position.

12. The work vehicle according to claim 11 , wherein:

the control steering wheel is configured to rotate about the steering wheel shaft axis; and

the upper surface is planar and the steering wheel shaft axis passes through a central portion of the upper surface.

13. The work vehicle according to claim 11 , wherein the steering wheel shaft axis extends through the upper surface of the steering column and the upper surface is arranged orthogonal to the steering wheel shaft axis.

14. The work vehicle according to claim 11 , wherein the upper surface of the steering column has an outer edge and a portion of the side surface of the steering column extends away from the outer edge along the steering wheel shaft axis.

15. The work vehicle according to claim 14 , wherein the outer edge defines an intersection of the upper surface and side surface of the steering column.

16. The work vehicle according to claim 11 , further comprising:

a dash board provided on the traveling machine body; and

a meter panel coupled to the dash board;

wherein the dash board comprises:

an inside board coupled to the meter panel, and

an outside cover which is disposed over the inside board such that the outside cover covers an upper side of the inside board; and

wherein the inside board defines an opening portion in which a display surface of the meter panel is disposed, and a side wall is formed into a shape in which an outer side of the display surface of the meter panel is formed by the side wall.

17. The work vehicle according to claim 1 , wherein:

a diesel particulate filter (DPF) regeneration switch, a working switch, and a one-touch automatic switch are provided on the upper surface of the steering column,

the DPF regeneration switch is provided on an upper surface of one side of the steering column above a brake pedal, and

the working switch and the one-touch automatic switch are positioned on a left side and a right side of a spoke of the spokes of the control steering wheel when the spoke is arranged in a vertical orientation.