Work vehicle

1. A work vehicle comprising:

an engine;

a stepless speed changer device having a drive pulley receiving input of power of the engine, a driven pulley, and an endless rotary body wound around and entrained between the the drive pulley and the driven pulley; and

an accommodating body having an accommodation space for accommodating the drive pulley, the driven pulley and the endless rotary body;

wherein the accommodation space includes an air passage for causing air introduced from the outside to flow from the driven pulley side to the drive pulley side to be eventually discharged to the outside,

wherein the accommodating body includes a first discharge opening capable of discharging air from the accommodation space to the outside,

wherein the first discharge opening is disposed on a side opposite the driven pulley relative to the drive pulley,

wherein at a portion of the accommodating body located between the drive pulley and the driven pulley, there is provided a second discharge opening separately of the first discharge opening, the second discharge opening being capable of discharging air from the accommodation space to the outside, and

wherein the first discharge opening and the second discharge opening are provided parallel with each other between the accommodating space and the outside of the accommodating space.

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

adjacent the driven pulley inside the accommodating body, there is provided an inlet capable of introducing air from the outside into the accommodation space; and

the work vehicle further comprises a fin disposed adjacent the inlet and capable of generating an air current flowing from the outside to the accommodation space in association with rotational drive of the driven pulley.

3. The work vehicle according to claim 2 , further comprising:

a driving section having a driver's seat; and

an air introducing member connected to the inlet; and

wherein an air introducing opening included in the air introducing member is disposed at a portion rearwardly of the driver's seat.

4. The work vehicle according to claim 1 , further comprising:

an air drawing member connected to the first discharge opening;

wherein the air drawing member includes an air drawing opening at an end opposite the first discharge opening, the air drawing opening being opened toward an oil pan of the engine.

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

the accommodating body includes an accommodating case for accommodating the drive pulley, the driven pulley and the endless rotary body, and a clutch case communicated to the accommodating case and configured to accommodate a centrifugal clutch capable of engaging/disengaging transmission of power of the engine to the drive pulley; and

the first discharge opening is provided in the clutch case.

6. A work vehicle comprising:

an engine;

a stepless speed changer device having a drive pulley receiving input of power of the engine, a driven pulley, and an endless rotary body wound around and entrained between the the drive pulley and the driven pulley; and

an accommodating body having an accommodation space for accommodating the drive pulley, the driven pulley and the endless rotary body;

wherein the accommodation space includes an air passage for causing air introduced from the outside to flow from the driven pulley side to the drive pulley side to be eventually discharged to the outside,

wherein the accommodating body includes a first discharge opening capable of discharging air from the accommodation space to the outside,

wherein the first discharge opening is disposed on a side opposite the driven pulley relative to the drive pulley,

wherein an air drawing member is connected to the first discharge opening,

wherein the air drawing member includes an air drawing opening at an end opposite the first discharge opening, the air drawing opening being opened toward an oil pan provided in a bottom portion of the engine to direct air towards the oil pan.