为了确保船舶齿轮箱水下密封可靠，开展船舶齿轮箱轴端唇形密封结构的最大密封水压研究。首先，进行齿轮箱轴端唇形密封结构的静力学仿真，得到了过盈量为0.5 mm条件下唇形密封和旋转轴之间的接触宽度和平均接触压力，经进一步计算得到了唇形密封结构的生热量。在此基础上，进行了唇形密封结构的热力学有限元仿真分析，获得了过盈量为0.5 mm时唇形密封结构最高温度随水压载荷的变化规律。最后，以150 ℃为最高温度上限，仿真获得了唇形密封结构的最大密封水压为0.035 MPa，并进行了输出轴端最大密封水压的试验验证，验证了仿真获得的最大密封水压结果的正确性。研究结果表明：在唇形密封与旋转轴过盈量为0.5 mm的条件下，唇形密封结构的最高温度与水压呈正相关关系。

In order to ensure the reliable underwater sealing of the marine gearbox, a study on the maximum sealing water pressure of the lip seal structure at the shaft end of the marine gearbox was carried out. Firstly, the hydrostatic simulation of the lip seal structure at the shaft end of the gearbox was carried out to obtain the contact width and the average contact pressure between the lip seal and the rotating shaft under the interference amount of 0.5 mm, and the heat generation of the lip seal structure was further calculated. Based on this result, the thermodynamic finite element simulation analysis of the lip seal structure was carried out to obtain the variation law of the maximum temperature of the lip seal structure with the hydraulic load under the interference amount of 0.5 mm. Finally, under the maximum temperature of 150 ℃, the maximum sealing water pressure of the lip seal structure of 0.035 MPa was obtained by the simulation, and the maximum sealing water pressure at the output shaft was verified by the test, proving the correctness of the maximum sealing water pressure. The results show that the maximum temperature of the lip seal structure is positively correlated with the water pressure under the condition that the interference amount between the lip seal and the rotary shaft is 0.5 mm.

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