The vibration generating during the motorcycle driving affects not only the operation stability and driving comfortable of the motorcycle, but also the riding safety of the driver. In addition, the main factors causing motorbike’s vibration are the inertia force and inertia torque produced by reciprocating of the crankshaft-connecting rod mechanism. Therefore, it must be designed of the appropriate balance mechanism to achieve the dynamic balance of the mechanism. This article is based on a type of two cylinder motorcycle engine, and the virtual prototyping model of the crankshaft-connecting rod mechanism is built by using the ADAMS/Engine, then dynamics simulations are carried on in this article. At last, the configuration of the balance mechanism is optimized according to the simulation results.%摩托车行驶时的振动大小不仅影响摩托车的操作稳定性和行驶舒适性，而且严重时会影响驾驶者骑行的安全性。而引起摩托车振动的主要因素是发动机曲柄连杆机构往复运动产生的惯性力和惯性力矩，所以必须针对曲柄连杆设计相应的平衡机构，使发动机实现内部活塞往复运动时的动态平衡。根据某企业的摩托车两缸汽油发动机图纸，本文将虚拟样机技术应用于发动机减振设计过程，通过ADAMS/Engine建模并对其模型的动力学特性进行分析，依据仿真结果优化平衡机构的配置。
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