Acording to the oil temperature influenced on the seal reliability, this paper put forward to the importance to study the temperature rise of the damping device. The thermodynamics of physical model of oil gas spring under the forced convection condition was established. The heat transfer coefficient expression of the correlation surface and the comprehensive heat transfer equation were deduced. After that, the external force and internal energy change rate of oil and nitrogen were researched. Through the principle of conservation of energy and the real gas state equation, the oil gas spring thermodynamic mathematical model was created. In the end, the external influence factors on the oil temperature rise were analyzed, the conclusion could be used as a reference for the design of damping device.
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