Work vehicle

Abstract

A work vehicle includes a cooling fan provided on a vehicle body frame to face a part of an opening of the vehicle body. The cooling fan includes blades defining a blade reachable region obtained by rotating the blades around a fan rotational axis. A first shroud is provided on the vehicle body frame between the blade reachable region and the vehicle body frame and covers a part of a side surface of the blade reachable region around the fan rotation axis. A heat exchanger is provided on the support frame and has a first surface to receive a cooling air when the heat exchanger covers the part of the opening. A second shroud is provided on the support frame and includes a distal end portion configured to cover a remaining part of the side surface of the blade reachable region other than the part of the side surface.

What is claimed is: 
     
         1 . A work vehicle comprising:
 a vehicle body frame having an opening;   a support frame rotatably connected to the vehicle body frame to be turned to a first position and a second position;   a cooling fan provided on the vehicle body frame to face a part of the opening, the cooling fan comprising:
 blades configured to rotate around a fan rotational axis to generate cooling air, the fan rotational axis passing through the part of the opening, the blades defining a blade reachable region obtained by rotating the blades around the fan rotational axis; 
   a first shroud provided on the vehicle body frame between the blade reachable region and the vehicle body frame as viewed along the fan rotational axis, the first shroud having a first shape to cover a part of a side surface of the blade reachable region around the fan rotation axis;   a heat exchanger provided on the support frame to cover the part of the opening when the vehicle body frame is turned to the first position and to have the part of the opening uncovered when the vehicle body frame is turned to the second position, the heat exchanger having a first surface configured to receive the cooling air when the heat exchanger covers the part of the opening; and   a second shroud provided on the support frame and comprising:
 a proximal end portion surrounding an outer periphery of the first surface of the heat exchanger; and 
 a distal end portion extending from the proximal end portion and having a second shape to cover a remaining part of the side surface of the blade reachable region other than the part of the side surface, when the heat exchanger covers the part of the opening. 
   
     
     
         2 . The work vehicle according to  claim 1 , wherein
 a gap is provided along the side surface of the blade reachable region between the part of the side surface and the remaining part of the side surface, when the heat exchanger covers the part of the opening.   
     
     
         3 . The work vehicle according to  claim 1 , wherein
 the first shroud contacts with the proximal end portion of the second shroud when the heat exchanger covers the part of the opening.   
     
     
         4 . The work vehicle according to  claim 1 ,
 wherein the vehicle body frame comprises a support wall defining a part of an outer periphery of the opening,   wherein the work vehicle further comprises a hinge provided on the support wall and having a hinge rotational axis,   wherein the support frame is supported by the hinge to be rotatable around the hinge rotational axis, and   wherein the first shroud is provided on the vehicle body frame between the plurality of blades and the support wall as viewed along the fan rotation axis.   
     
     
         5 . The work vehicle according to  claim 1 ,
 wherein the first shape is substantially an arc shape as viewed along the fan rotational axis.   
     
     
         6 . The work vehicle according to  claim 4 ,
 wherein the heat exchanger has a second surface opposite to the first surface in an air-flow direction such the cooling air is configured to flow out of the heat exchanger via the second surface when the heat exchanger covers the part of the opening, and   wherein the second surface is exposed from the support frame.   
     
     
         7 . The work vehicle according to  claim 6 ,
 wherein the second shape is substantially an arc shape as viewed in the air-flow direction.   
     
     
         8 . The work vehicle according to  claim 1 , wherein the second shape is determined such that the distal end portion of the second shroud does not enter the blade reachable region when the support frame is turned. 
     
     
         9 . The work vehicle according to  claim 7 ,
 wherein the first shape is substantially an arc shape as viewed along the fan rotational axis,   wherein a radius of the arc shape of the second shape is substantially equal to a radius of the arc shape of the first shape, and   wherein, when the heat exchanger covers the part of the opening, a center of the arc shape of the first shape substantially coincides with a center of the arc shape of the second shape.   
     
     
         10 . The work vehicle according to  claim 9 , wherein a central angle of the arc shape of the second shape is 180 degrees or more, and a central angle of the arc shape of the first shape is 180 degrees or less. 
     
     
         11 . The work vehicle according to  claim 10 , wherein a distance between two end points of the arc shape of the second shape is larger than a diameter of the blade reachable region as viewed in the air-flow direction. 
     
     
         12 . The work vehicle according to  claim 5 , wherein a distance between two end points of the arc shape of the first shape is smaller than a diameter of the blade reachable region. 
     
     
         13 . The work vehicle according to  claim 3 , wherein the first shroud includes an elastic body provided at a portion of the first shroud configured to abut the proximal end portion of the second shroud when the heat exchanger covers the part of the opening. 
     
     
         14 . The work vehicle according to  claim 6 , further comprising:
 a cover configured to cover the second surface, which is swingable around a cover rotational axis.   
     
     
         15 . The work vehicle according to  claim 14 , wherein the cover rotational axis is provided opposite to the hinge rotational axis with respect to the opening. 
     
     
         16 . The work vehicle according to  claim 14 , wherein the cover has a plurality of air holes in a part of the cover configured to confront the second surface when the cover is turned to cover the second surface. 
     
     
         17 . The work vehicle according to  claim 14 , wherein the cover is a bonnet cover. 
     
     
         18 . The work vehicle according to  claim 1 ,
 wherein, when the support frame is turned to the second position, an internal space opposite to the opening with respect to the cooling fan is accessible through a gap between two adjacent blades among the blades.   
     
     
         19 . The work vehicle according to  claim 4 ,
 wherein the second position is obtained by rotating the support frame by 90 degrees or more around the hinge rotational axis from the first position.   
     
     
         20 . The work vehicle according to  claim 1 ,
 wherein a length of the distal end portion of the second shroud in the air-flow direction is longer than a length of the blade reachable region along the fan rotational axis, and   wherein a length of the first shroud along the fan rotational axis is shorter than the length of the blade reachable region.