本文用流体动力润滑理论分析了渐开线圆柱直齿修缘齿轮齿面间的油膜厚度。在求解时考虑了滚动速度、滑动速度、挤压速度,润滑油粘度的变化、以及每一瞬间真实的啮合齿数等因素的影响,并导出了压力分布的表达式。在中小载荷的情况下,用数值计算方法求得了渐开线直齿修缘齿轮的油膜厚度变化曲线和压力分布曲线。得到了油膜厚度和修缘量之间的关系以及一系列动态特性。作者用实验验证了理论计算的油膜厚度,在实验中,油膜厚度的测定采用了“位移法”。 In this paper, the hydrodynamic lubrication theory was used to analyze the film thickness of involute cylindrical spur gear teeth. The influence of factors such as rolling speed, sliding speed, extrusion speed, viscosity of lubricating oil, and the number of meshing teeth at each instant was considered. The expression of pressure distribution was derived. In the condition of medium and small load, the change curve of oil film thickness and the pressure distribution curve of involute spur gear were obtained by numerical calculation method. The relationship between oil film thickness and the amount of repair and a series of dynamic characteristics were obtained. The author experimentally verified the theoretical calculation of the oil film thickness, in the experiment, the determination of film thickness using the “displacement method.”