One-way transmission device with coupling

The invention relates to a one-way transmission device with a coupling, and belongs to a transmission device of a power device. The one-way transmission device comprises a coupling, a one-way clutch, elastic element components and compression springs, wherein the clutch comprises an inner race and an outer race; the coupling comprises two half couplings, and the elastic element components and thecompression springs are uniformly distributed between the two half couplings; one of the half couplings is in rigid connection with a prime mover input shaft, and the half coupling is connected with the other half coupling through the elastic element components and the compression springs; the other half coupling is in rigid connection with the inner race or the outer race of the clutch through akey and transfers torsion through the action of a middleware and the corresponding outer race or the corresponding inner race, and the end part of the corresponding outer race or the corresponding inner race is connected with