System of the present invention is a kind of actuating unit of cultivator,It is to include on a hydraulic motor combination what cultivator,It is driven in conjunction with a chain-wheel box upper end sprocket wheel with its axle center,And linked with an oil return pipe and a fuel tank,Hydraulic motor is connected with efferent duct with unification pumping and a fuel tank is connected with input pipe,And hydraulic motor,The circuit of one circulation of connection composition between fuel tank and pumping,And with a control box with control line connection hydraulic motor and pumping； In order to composition one oil pressure actuating unit,By control box startup power supply Hou by pumping the input hydraulic motor driving operating of fuel tank oil liquid,And penetrate chain-wheel box and drive ploughing and weeding break bar,Multistage mechanical transmission is replaced to can avoid multiple kinetic equation loss with hydraulic transmission,And the working efficiency of ploughing and weeding operation is improved,And replace the bulky mechanical consumptive material of higher price that can reduce maintenance expense again with tubing transmission power,Progressive and economic benefit are had both up to winner.本發明係為一種耕耘機之動力傳動裝置，係包含一油壓馬達結合於耕耘機上，以其軸心與一鏈輪箱上端鏈輪結合帶動，並以一迴油管與一油箱連結，配合一泵浦以輸出管連接油壓馬達及以輸入管連接一油箱，而在油壓馬達、油箱與泵浦間連接組成一循環的迴路，及以一控制盒以控制線連接油壓馬達與泵浦；俾組成一油壓的動力傳動裝置，由控制盒啟動電源後由泵浦將油箱油液輸入油壓馬達驅動運轉，而透過鏈輪箱帶動耕耘刀輪，以油壓傳動取代多段機械式傳動可避免多重的動力損耗，而提高耕耘操作的工作效率，且以油管傳輸動力取代較高價笨重的機械耗材又可降低維修保養費用，兼具進步性與經濟效益達成者。
