Vehicle body structure of cab-over type vehicle

1 . A vehicle body structure of a cab-over type vehicle in which a cab body is supported by a chassis frame via mounts,

the vehicle body structure of the cab-over type vehicle comprising:

a floor cross member extending in a vehicle width direction along a lower surface of a floor panel of the cab body and including a pair of mount portions on both sides in the vehicle width direction to which the mounts are attached; and

a gusset extending in a vehicle front-rear direction between the pair of mount portions below the floor panel, including one end portion joined to the lower surface of the floor panel and the other end portion joined to a lower surface of the floor cross member, and linearly connecting the lower surface of the floor panel and the lower surface of the floor cross member, wherein

on one end portion of the lower surface of the floor cross member in the vehicle front-rear direction, a step extending in the vehicle width direction and a step surface are formed, the step surface being a lower surface on one end side relative to the step in the vehicle front-rear direction and larger in height than a lower surface on the other end side in the vehicle front-rear direction relative to the step, and

the other end portion of the gusset is joined to the step surface.

2 . The vehicle body structure of the cab-over type vehicle according to claim 1 , wherein

the gusset includes:

a bottom portion having a predetermined width in the vehicle width direction and extending linearly from the lower surface of the floor cross member to the lower surface of the floor panel;

a side portion extending from an end portion of the bottom portion toward a side surface of the floor cross member on one end side in the vehicle width direction and the lower surface of the floor panel; and

a flange portion extending from the bottom portion and an end portion of the side portion along the side surface of the floor cross member and the lower surface of the floor panel.

3 . A vehicle body structure of a cab-over type vehicle in which a cab body is supported by a chassis frame via mounts, the vehicle body structure of the cab-over type vehicle comprising,

a floor cross member extending in a vehicle width direction along a lower surface of a floor panel of the cab body and including a pair of mount portions on both sides in the vehicle width direction to which the mounts are attached; and

a gusset extending in a vehicle front-rear direction between the pair of mount portions below the floor panel, including one end portion joined to the lower surface of the floor panel and the other end portion joined to a lower surface of the floor cross member, and linearly connecting the lower surface of the floor panel and the lower surface of the floor cross member, wherein

a seat is disposed above the floor cross member, and

a seat attachment portion configured to attach the seat is provided on a position of the floor panel located inside a contour of the gusset in a plan view.

4 . The vehicle body structure of the cab-over type vehicle according to claim 3 ,

further comprising:

a seat belt device including a seat belt configured to restrain an occupant seated on the seat and a buckle including a buckle anchor, a tongue of the seat belt to be inserted into and removed from the buckle, wherein

an anchor attachment portion configured to attach the buckle anchor is provided on the position of the floor panel located inside the contour of the gusset in the plan view.

5 . The vehicle body structure of the cab-over type vehicle according to claim 4 , wherein

the buckle is disposed on a front side relative to the gusset in the vehicle front-rear direction, and

the gusset extends linearly from the lower surface of the floor cross member to the lower surface of the floor panel in a forward and obliquely upward direction.

6 . The vehicle body structure of the cab-over type vehicle according to claim 4 , further comprising:

a reinforcement provided between the floor cross member and the floor panel, wherein

the reinforcement extends in the vehicle front-rear direction while overlapping the floor panel from the floor cross member,

the one end portion of the gusset overlaps from below one end portion in the vehicle front-rear direction of the reinforcement overlapping the floor panel, and is joined together with the floor panel and the reinforcement, and

the seat attachment portion and/or the anchor attachment portion is provided at a position at which the reinforcement and the floor panel overlap each other on a one end portion side of the reinforcement relative to the floor cross member and on a floor cross member side relative to the one end portion of the reinforcement.

7 . A vehicle body structure of a cab-over type vehicle in which a cab body is supported by a chassis frame via mounts, the vehicle body structure of the cab-over type vehicle comprising:

a floor cross member extending in a vehicle width direction along a lower surface of a floor panel of the cab body and including a pair of mount portions on both sides in the vehicle width direction to which the mounts are attached;

a gusset extending in a vehicle front-rear direction between the pair of mount portions below the floor panel, including one end portion joined to the lower surface of the floor panel and the other end portion joined to a lower surface of the floor cross member, and linearly connecting the lower surface of the floor panel and the lower surface of the floor cross member, and

a reinforcement provided between the floor cross member and the floor panel, wherein

the reinforcement extends in the vehicle front-rear direction while overlapping the floor panel from the floor cross member, and

the one end portion of the gusset overlaps from below one end portion in the vehicle front-rear direction of the reinforcement overlapping the floor panel, and is joined together with the floor panel and the reinforcement.