Patent ID: 8621834

Claim:
A drive arrangement for a reel ( 52 ) and a chaff spreader ( 60 ) of a combine ( 10 ), having a first hydraulic motor ( 56 ) for driving the reel ( 52 ) and a second hydraulic motor ( 62 , 62 ′) for driving the chaff spreader ( 60 ), wherein the hydraulic motors ( 56 , 62 , 62 ′) are connected in series with regard to the flow of hydraulic fluid, wherein each of the hydraulic motors ( 56 , 62 , 62 ′) has a corresponding supply line for supplying hydraulic fluid to said each of the hydraulic motors ( 56 , 62 , 62 ′), wherein the hydraulic motors ( 56 , 62 , 62 ′) have a fixed displacement volume and are driven by a pump ( 66 ) having a fixed delivery volume, and wherein a proportional valve ( 68 , 70 ) is arranged in the corresponding supply line ( 80 , 88 ) of each of the hydraulic motors ( 56 , 62 , 62 ′) in order to vary the speed of the hydraulic motors ( 56 , 62 , 62 ′), and further wherein upstream connections of the proportional valves ( 68 , 70 ) and downstream connections of the hydraulic motors ( 56 , 62 , 62 ′) are in each case bridged by control valves ( 72 , 74 ) which maintain a defined pressure or defined flow or both a defined pressure and a defined flow in a connecting line ( 84 ) between the first hydraulic motor ( 56 ) and second hydraulic motor ( 62 , 62 ′).