Agricultural vehicle with belt unloader

1. An agricultural vehicle, comprising:

a chassis;

a cleaning system carried by said chassis including at least one sieve and configured to clean crop material; and

an unloader carried by said chassis and supplied with cleaned crop material from said cleaning system, said unloader including:

a roller;

a belt wrapped around said roller and defining a conveying side and a return side opposite said conveying side; and

an oblong housing at least partially enclosing said belt, said oblong housing comprising a first U-shaped surface in contact with said conveying side of said belt and a second U-shaped surface in contact with said return side of said belt.

2. The agricultural vehicle according to claim 1 , wherein said belt defines a flattened region between said first U-shaped surface and said second U-shaped surface during rotation of said roller.

3. The agricultural vehicle according to claim 1 , wherein said oblong housing includes a divider including at least one of said first U-shaped surface and said second U-shaped surface.

4. The agricultural vehicle according to claim 1 , wherein said roller comprises a first diameter region defining a first roller diameter and a second diameter region connected to said first diameter region and defining a second roller diameter which is less than said first roller diameter.

5. The agricultural vehicle according to claim 4 , wherein said roller defines a tapering region between said first diameter region and said second diameter region, said first roller diameter linearly decreasing in said tapering region to said second roller diameter.

6. The agricultural vehicle according to claim 4 , wherein said roller defines a generally hourglass shape formed by a pair of first diameter regions connected by said second diameter region.

7. The agricultural vehicle according to claim 4 , wherein said roller includes a surface approximately defining a U-shape and defining a roller degree of curvature which is greater than a housing degree of curvature of at least one of said first U-shaped surface and said second U-shaped surface of said oblong housing.

8. A material conveyor, comprising:

a roller;

a belt wrapped around said roller and defining a conveying side and a return side opposite said conveying side; and

an oblong housing at least partially enclosing said belt, said oblong housing comprising a first U-shaped surface in contact with said conveying side of said belt and a second U-shaped surface in contact with said return side of said belt.

9. The material conveyor according to claim 8 , wherein said belt defines a flattened region between said first U-shaped surface and said second U-shaped surface during rotation of said roller.

10. The material conveyor according to claim 8 , wherein said oblong housing includes a divider including at least one of said first U-shaped surface and said second U-shaped surface.

11. The material conveyor according to claim 8 , wherein said roller comprises a first diameter region defining a first roller diameter and a second diameter region connected to said first diameter region and defining a second roller diameter which is less than said first roller diameter.

12. The material conveyor according to claim 11 , wherein said roller defines a tapering region between said first diameter region and said second diameter region, said first roller diameter linearly decreasing in said tapering region to said second roller diameter.

13. The material conveyor according to claim 11 , wherein said roller defines a generally hourglass shape formed by a pair of first diameter regions connected by said second diameter region.

14. The material conveyor according to claim 11 , wherein said roller includes a surface approximately defining a U-shape and defining a roller degree of curvature which is greater than a housing degree of curvature of at least one of said first U-shaped surface and said second U-shaped surface of said oblong housing.

15. An agricultural vehicle, comprising:

a chassis;

a cleaning system carried by said chassis including at least one sieve and configured to clean crop material; and

an unloader carried by said chassis and supplied with cleaned crop material from said cleaning system, said unloader including:

a roller;

a belt wrapped around said roller and defining a conveying side and a return side opposite said conveying side; and

a housing at least partially enclosing said belt and having a divider comprising a first U-shaped surface in contact with said conveying side of said belt and a second U-shaped surface in contact with said return side of said belt.

16. The agricultural vehicle according to claim 15 , wherein said belt defines a flattened region between said first U-shaped surface and said second U-shaped surface during rotation of said roller.

17. The agricultural vehicle according to claim 15 , wherein said roller comprises a first diameter region defining a first roller diameter and a second diameter region connected to said first diameter region and defining a second roller diameter which is less than said first roller diameter.

18. The agricultural vehicle according to claim 15 , wherein said first U-shaped surface and said second U-shaped surface are flipped about a dividing surface of said divider.