Rear transmission mechanism of engine of frame vehicle

The invention relates to a rear transmission mechanism of an engine of a frame vehicle. The frame vehicle comprises a frame, a cab, a steering axle, a drive axle, wheels, a gearbox and the engine, wherein the cab is arranged at the lower part of the front end of the frame; the steering axle and the drive axle are arranged at the lower part of the frame; the wheels are connected to the lower part of the steering axle or the drive axle; and the engine is arranged at the lower part of the rear end of the frame and used for driving the drive axle through the gearbox. The rear transmission mechanism is compact in structure and large in climbing approach and departure angles, and is especially suitable for the under cap type frame vehicle.