Speed regulation type fluid coupling

The utility model provides a speed regulation type hydraulic coupler, which relates to the technical field of hydraulic couplings, and comprises a box body and an external lubricating oil supply assembly, a rotating piece is arranged in the box body, the rotating piece comprises a pump wheel and a turbine, the pump wheel and the turbine are symmetrically arranged to form a working cavity, and the working cavity is filled with working oil. The external lubricating oil supply assembly is arranged outside the box body and comprises a lubricating oil pump, an oil inlet of the lubricating oil pump is communicated with the working cavity through a first pipeline, an oil outlet of the lubricating oil pump is communicated with an oil return opening of the box body through a second pipeline, the second pipeline passes through a bearing of external equipment, and the bearing is lubricated by lubricating oil. According to the utility model, enough lubricating oil can be provided for external equipment, the defects of hi