It was pointed out that the actual center-line and theoretic meshing line of the paired gears varied in the form of planar motion due to the system vibration, and the actual meshing line was curvilinear.

• 结果表明，由于系统振动的原因，齿轮副的实际中心线和理论啮合线是以平面运动方式变化的，实际啮合线（即啮合点的轨迹）是一条曲线。