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四、齿轮传动中的弹流润滑油膜厚度的计算从渐开线齿轮传动的运动学分析可知,一对轮齿的啮合过程是一种非稳态过程。要直接利用Dowson-Higginson按稳态等温弹流理论所推得的油膜厚度公式来预计齿轮啮合中所形成的油膜,本来是不妥当的。不过润滑油流过接触区所需的时间极短(约10~(-4)～10~(-6)秒),而一对轮齿完成一个啮合循环所需的时间则长得多。因此,L.S.Akin[7]认为把轮齿在啮合线b_1b_2上(参看图1,α)任一瞬时位置的啮合情况,就用该点的曲率半径、滚动速度及
Fourth, gear transmission in the calculation of the thickness of the oil film from the involute gear kinematics analysis shows that a pair of gear meshing process is a non-steady-state process. It is not proper to directly use the oil film thickness formula deduced by Dowson-Higginson according to the steady state isothermal eruptive theory to predict the oil film formed during gear meshing. However, the time it takes for lubricant to flow through the contact zone is extremely short (about 10 -4 to 10 -6 seconds) and the time it takes for a pair of teeth to complete a meshing cycle is much longer. Therefore, L.S.Akin [7] considers the engagement of the gear teeth at any instantaneous position on the engaging line b_1b_2 (see FIG. 1, α), and uses the radius of curvature of the point, the rolling speed and