ROPS frame for work vehicle, and work vehicle

1. A roll-over protective structure (ROPS) frame for a work vehicle, comprising:

a plurality of pipes comprising:

a first pipe having a rear end; and

a second pipe having a front end facing the rear end of the first pipe, the rear end and the front end being disposed in an upper portion of the ROPS frame;

a plate-shaped first joint coupled to the rear end of the first pipe and oriented orthogonally to a longitudinal direction of the pipes;

a plate-shaped second joint coupled to the front end of the second pipe and oriented orthogonally to the longitudinal direction of the pipes, the second joint placed on the first joint; and

a pair of bolts each extending through the first and second joints and fastening the first and second joints to each other,

the first pipe and the second pipe each have a pair of recesses which are recessed toward an axial area of the pipe, the pair of recesses arranged opposite to each other across the axial area, as viewed in the longitudinal direction,

the pair of recesses includes a first recess positioned upward relative to the axial area and laterally inward relative to the axial area, and a second recess positioned downward relative to the axial area and laterally outward relative to the axial area, and

the pair of bolts includes a first bolt adjacent to the first recess, and a second bolt adjacent to the second recess.

2. A work vehicle, comprising:

a ROPS frame according to claim 1 .

3. A roll-over protective structure (ROPS) comprising:

a plurality of pipes comprising:

a first pipe having an end; and

a second pipe having an end facing the end of the first pipe;

a plate-shaped first joint coupled to the end of the first pipe and oriented orthogonally to a longitudinal direction of the pipes;

a plate-shaped second joint coupled to the end of the second pipe and oriented orthogonally to the longitudinal direction of the pipes, the second joint placed on the first joint;

a bolt extending through the first and second joints and fastening the first and second joints to each other;

a first frame member oriented in a direction crossing the first and second pipes and having an end facing the respective ends of the first and second pipes; and

a coupling member coupled to the end of the first pipe and the end of the first frame member and coupled to the end of the second pipe and the end of the first frame member.

4. The ROPS frame according to claim 3 , further comprising:

a second frame member oriented in a direction crossing the first and second pipes and the first frame member and having an end facing the respective ends of the first and second pipes, and

wherein the coupling member is further coupled to the end of the first pipe and the end of the second frame member and coupled to the end of the second pipe and the end of the second frame member.

5. The ROPS frame according to claim 4 , wherein:

the end of the first frame member and the end of the second frame member are coupled to each other.

6. The ROPS frame according to claim 3 , wherein:

the coupling member is coupled to the end of the first pipe at a first coupling portion apart from a second coupling portion at which the coupling member is coupled to the end of the second pipe, and

the respective ends of the first and second pipes face each other at a portion between the first coupling portion and the second coupling portion.

7. The ROPS frame according to claim 3 , wherein:

the coupling member is coupled to the end of the first pipe with:

the coupling member placed on an outer surface of the end of the first pipe; and

a first auxiliary coupling member placed on the outer surface of the end of the first pipe and coupled to the coupling member, and

the coupling member is coupled to the end of the second pipe with:

the coupling member placed on an outer surface of the end of the second pipe; and

a second auxiliary coupling member placed on the outer surface of the end of the second pipe and coupled to the coupling member.

8. A roll-over protective structure (ROPS) frame for a work vehicle, comprising:

a plurality of pipes comprising:

a first pipe having a rear end; and

a second pipe having a front end facing the rear end of the first pipe, the rear end and the front end disposed in an upper portion of the ROPS frame;

a plate-shaped first joint coupled to the rear end of the first pipe and oriented orthogonally to a longitudinal direction of the pipes;

a plate-shaped second joint coupled to the front end of the second pipe and oriented orthogonally to the longitudinal direction of the pipes, the second joint placed on the first joint; and

a pair of bolts each extending through the first and second joints and fastening the first and second joints to each other,

wherein the pair of bolts are disposed in respective end portions of a virtual line in the first joint and the second joint, the virtual line being a longest line across the joint and passing an axial area of the pipe, as viewed in the longitudinal direction of the pipes, and

wherein the pair of bolts includes a first bolt positioned upward relative to the axial area and laterally inward relative to the axial area as viewed in the longitudinal direction of the pipes, and a second bolt positioned downward relative to the axial area and laterally outward relative the axial area as viewed in the longitudinal direction of the pipes.