APPARATUS FOR CONTROLLING TRAVELING SPEED OF COMBINE HARVESTER

PURPOSE:To suppress the lowering of the work efficiency caused by the unnecessary speed-reducing control while preventing the stalling of the engine caused by the increase of the load on the engine. CONSTITUTION:The traveling speed controlling apparatus of a combine harvester is provided with an electric motor 8 to drive a speed change gear 7 for traveling, a sensor S1 for detecting the rotational speed of the engine, and a culm base sensor S0 to detect whether the combine harvester is in a reaping state or not. the apparatus is also provided with a controlling apparatus 15 to reduce the speed of the electric motor 8 to keep the rotational speed of the engine detected by the detection sensor S1 above a preset level after detecting the change from the reaping work state to the non-reaping work state by the culm base sensor S0. A gyration state detection sensor S2 detects whether the traveling machine body is in the state of gyrating motion or not. When the gyration state detection sensor S2 detects the change from the gyrating state to the non-gyrating state in the case of detecting the gyrating state by the gyration state detection sensor S2 and preforming the speed-reduction control by the controller 15, the speed-reduction control is stopped by the controller 15.