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一、前言某八缸发动机采用60°气缸夹角和平面曲轴的结构,其主要问题是发火间隔不均匀和二次惯性力不平衡。发动机的输出端装有飞轮,减少了由于发火间隔不均而反扭矩随曲轴转速跳动量大而引起的振动;二次惯性力则采用了单平衡轴平衡,从直观感觉比没平衡机有明显的好转。但由于发动机运动件结构为主付连杆式,二次惯性力作用轨迹类似椭圆形并作非均速运动见图1,所以用单平衡轴的离心力——圆形均速运动力,来平衡二次惯性是无法全部平衡的。单轴平衡后余下的二次惯性力在惯性力方向不平衡量见图2,从图看出,虽然单
I. Foreword An eight-cylinder engine adopts the structure of 60 ° cylinder angle and plane crankshaft. The main problem is the uneven firing interval and the unbalanced secondary inertia force. The output end of the engine is equipped with a flywheel, which reduces the vibration caused by the large torque fluctuation of the anti-torque with the crankshaft speed due to the uneven firing interval. The second inertial force adopts the balance of single balance shaft, which is more obvious than the unbalanced machine The improvement. However, due to the structure of engine moving parts to pay the main link, the second inertial force similar to the trajectory of elliptical and non-uniform motion shown in Figure 1, so a single balance shaft centrifugal force - circular uniform speed movement to balance Second inertia can not be fully balanced. After the uniaxial balance of the remaining secondary inertial force imbalance in the direction of inertial force shown in Figure 2, seen from the figure, although the single