Non-road vehicle power coupling device

Compared with a traditional loader hydraulic mechanical power gear shifting gearbox, the non-road vehicle power coupling device has the advantages that the transmission efficiency of a transmission device can be greatly improved, an engine can normally work in an economical rotating speed interval, and the oil consumption and the noise level of a loader are reduced. The non-road vehicle power coupling device comprises a hydraulic speed regulation loop, a forward and reverse mechanism, a flow dividing and converging mechanism, a hydraulic section dead axle gear transmission unit, a hydraulic machinery I section dead axle gear transmission unit, a hydraulic machinery II section dead axle gear transmission unit and an output unit. A forward gear of the power coupling device comprises a hydraulic section and two hydraulic mechanical sections which are respectively used for starting, low-speed operation and high-speed walking; the reverse gear comprises a hydraulic section and two hydraulic mechanical sections. Th