Combustion motor and stirling compound engine

The invention relates to an engine compounded by combustion motor and stirling engine. Combustion motor and stirling engine are in the same machine body, the exhaust pipe of the combustion motor is connected with the heater of the stirling enging in series, exhaust of the combustion motor is taken as high temperature heat source of the stirling engine, and power produced by the two engines is used for driving the same crankshaft. Working medium in the stirling engine passes through closed circulation loops, each loop is composed of an expanding cavity, a piston, a compression cavity, a heat regenerator, a cooler and a group of heating tubes which are sequentially connected. The processes of working medium when doing work in the circulation loop are the same, namely the working medium absorbs heat of exhaust of the combustion motor and then is expanded in the expanding cavity, the piston is driven to move downward, and the crankshaft is driven to do work. The invention has the characteristic that stirling engine can absorb waste heat of exhaust of combustion motor to the utmost extent. Compared with the traditional combustion motor waste heat recycling device, the invention can cause mean effective power of diesel engine to be increased by 10% under the same fuel consumption condition.