Transition device for a combine threshing system

A transition device for a threshing system for an agricultural harvester, the transition device comprising:

• a body having an inlet end for receiving crop material from a feeder source, and an outlet end opposite the inlet end for distributing crop material into a threshing space of the threshing system;
• and
• a plurality of vanes positioned on an interior facing surface of the body for guiding the crop material through the transition device, each vane having a first end positioned at the inlet end of the body and a second end positioned either on or adjacent the outlet end of the body, wherein an arc length between the first ends of two adjacent vanes of the plurality of vanes is less than or equal to an arc length between the second ends of the two adjacent vanes of the plurality of vanes, such that the crop material can expand between the two adjacent vanes upon travelling along a trajectory from the inlet end to the outlet end of the transition device,
• wherein the first ends of the vanes are positioned on only one side of the inlet end of the body, and
• wherein the first ends of the vanes are uniformly spaced apart about said one side of the inlet end of the body.

A transition device for a threshing system for an agricultural harvester, the transition device comprising:

• a body having an inlet end for receiving crop material from a feeder source, and an outlet end opposite the inlet end for distributing crop material into a threshing space of the threshing system;
• and
• a plurality of curved vanes positioned on an interior facing surface of the body for guiding the crop material through the transition device, each curved vane having a first end positioned either on or adjacent the inlet end of the body and a second end positioned either on or adjacent the outlet end of the body,
• wherein the first ends of the vanes are not uniformly distributed about an entire circumference of the inlet end, and the second ends of the vanes are uniformly distributed about an entire circumference of the outlet end, and
• wherein an arc length between the first ends of two adjacent curved vanes of the plurality of vanes is less than or equal to an arc length between the second ends of the two adjacent curved vanes of the plurality of vanes, such that the crop material can expand between the two adjacent curved vanes upon travelling along a spiral trajectory from the inlet end to the outlet end of the transition device.