农业机械底盘机械式变速箱虚拟装配

研究了农业机械的机械式变速箱虚拟装配模型建立方法,并实现了其虚拟装配.将虚拟装配模型分为装配零件固有信息和动态信息的对象模型、装配成员之间层次关系的装配树模型、零部件之间配合约束的关系图模型,通过CAD系统与虚拟装配系统之间的模型数据转换方法获取装配模型信息,在虚拟装配系统中建立装配模型.采用基于空间位置和几何约束的自由度分析法,实现了虚拟装配过程中的运动约束.利用虚拟现实软件EON及其二次开发技术,建立虚拟装配模块,实现了某机械式变速箱的虚拟装配过程.

Virtual Assembly for Mechanical Gearbox of Agricultural Chassis

The virtual assembly model of mechanical gearbox was researched and its virtual assembly process was realized. By analyzing the information of the virtual assembly object and the relationship between the assembly objects, the virtual assembly model was divided into the object model describing inherent information and dynamic information in the assembly parts, the assembly tree model describing assembly-level information of assembly members, and the relational model describing the parts assembly constraints between the assembly parts. The assembly model information was obtained by the conversion of model data between CAD system and virtual assembly system. Then the assembly model was developed in the virtual assembly system and the implementation of the motion constraints in the virtual assembly process was proposed. By analyzing the DOF based on the space position and geometric constraints, the motion constraints were determined. Using EON and its secondary development tool, the virtual assembly module was built, and then the virtual assembly process of mechanical gearbox was implemented.