Axial Flow Rotors This is a short explanation concerning advantages of using rasp type rotor bars, as opposed to conventional rub bar type rotor bars. The nearly vertical profile of the leading edges of rasp type rotor bar teeth pulls more easily, and provides more positive rolling and fluffing action of material for separation of the crop, without the requirement for the squeezing and tearing action of rub bar type rotor bars. The depth and spacing of rasp type rotor bar teeth provides open area for grain and fines to channel between them, as opposed to the pinching action at the concave surface required by the use of shallower toothed rub bar style rotor bars, and also deposits grain and fines more evenly through the entire concave and separating grate areas, providing a more consistent spreading of the load across the cleaning shoe. The constant arch at the top of the rasp bar type teeth provide for a wider area of coverage in respect to concave overbore, and in combination with tooth spacing provide more angular deflection against the concave crossbars than rub style rotor bars, moving material toward the rotor discharge area more easily, and preventing roping in vine crops. The longer length of individual rotor bars, in combination with mountings, which are spiraled around the rotor in a staggered configuration, sweeps and spreads material across the concave crossbars more evenly, and provide for a more consistent threshing progression and load on the rotor.

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Case IHC Rotor

Case IHC Rotor in Progress

New Holland Rotor

White/Massey Rotor

Chrome Alloy Rotor Bars

US Pat. No. 6,261,176