Hydraulic hybrid power device of heavy vehicle

The invention provides a hydraulic hybrid power device of a heavy vehicle. The hydraulic hybrid power device comprises a plurality of hydraulic pumps/motors, energy accumulators and a hydraulic oil tank, wherein a rotating shaft of each hydraulic pump/motor is connected in parallel with a transmission shaft of the vehicle, each hydraulic pump/motor is connected with a main control valve group, in addition, a loop is formed, and an oil inlet and outlet opening of each hydraulic pump/motor is connected with the corresponding energy accumulator and the hydraulic oil tank through the main control valve groups. During the vehicle braking, hydraulic oil flows from the hydraulic oil tank to the corresponding energy accumulator through the main control valve groups; during the vehicle starting, the hydraulic oil flows from the corresponding energy accumulator to the hydraulic oil tank through the main control valve groups; during the normal running of the vehicle, the hydraulic oil circularly flows on an inside oil path of the main control valve groups through the main control valve groups. The hydraulic hybrid power device has the advantages that each hydraulic pump/motor is provided with one main control valve group, the complicated working condition requirement of the vehicle is met, and in addition, each main control valve group is compact in structure, low in cost and small in size. The hydraulic hybrid power device is provided with a plurality of hydraulic pumps/motors, the main control valve groups and the energy accumulators, the arrangement is more compact, the installation space is smaller, and the hydraulic hybrid power device is applicable to vehicles with greater loads.