Hydraulic coupler for diesel engine lubricating oil level adjusting system

The hydraulic coupler for the diesel engine lubricating oil level adjusting system comprises a shell, a pump wheel rotationally installed on one side of the shell and a turbine rotationally installed on the other side of the shell, the turbine and the pump wheel are coaxially arranged, and the turbine is rotationally installed on the shell through a driven shaft; an oil inlet hole is formed in the driven shaft, and the length direction of the oil inlet hole is the same as that of the driven shaft; a containing groove communicated with the oil inlet hole is formed in the position, corresponding to the driven shaft, of the pump wheel, and oil guide holes used for communicating the containing groove with the impeller cavities are formed in the positions, corresponding to the impeller cavities, of the pump wheel; an oil collecting cover is arranged on the side, facing the turbine, of the pump wheel, and the other side of the pump wheel is rotationally installed on the shell through a driving shaft. The hydraulic