第9章装配结构的合理性.ppt

Structures of parts contact 接触处的结构 Structures of parts contact 接触处的结构 Structures of sealing devices 密封装置结构 Structures of sealing devices 密封装置结构 Structures of sealing devices 密封装置结构 本 小 节 结 束 * * Rationality of Fitting Structure  装配结构的合理性 Structures of parts contact 接触处的结构 Removable joint structures 可拆联接结构 Structures of sealing devices 密封装置结构 Exercises 练习题 请点击相应标题显示其内容 1) If two parts assemble in the same direction, there should be only one pair of contact surfaces, thus, reliable contact of the parts can be ensured, the processing requirements lowered and the cost reduced. 两个零件在同一方向上，只允许有一对接触面。这样既 保证了零件的可靠接触，又降低了加工要求和成本。 Quantity of the contact surface 接触面的结构 请点击鼠标左键显示后面内容 2) Two tapered parts are permitted to have only one contact surface in two directions (axial or radial). therefore, it can ensure a stable contact surface. 两个圆锥体零件在两个方向(轴向、径向)上只允许有一 对接触面。这样, 就能确保这对接触面稳定接触。 2. Structure of a contact surface corner 接触面转角处的结构 When two parts contact with a pair of surfaces having a right-angle crossing each other, it is a must to machine a chamfer, groove or round at the corner of the contact surface of the two parts. 当两个零件上有一对垂直相交的表面接触时，应在转角处 制出倒角、沟槽或圆角，否则难以保证接触良好。 请点击鼠标左键显示后面内容 When drawing, one should ensure that the external thread fully goes into the internal thread. The external thread should have an escape or the internal thread should have a chamfer. 要使外螺纹全部拧入内螺纹中，外螺纹终止处应有退刀槽, 内螺纹起始端应有倒角。 1. Reliable joint structures 可靠联接结构 Removable joint structures 可拆联接结构 请点击鼠标左键显示后面内容 2) If the end of a shaft is a thread joint, one should keep a segment of the thread from going into the nut to ensure that the nut can move forward. 当轴端为螺纹联接时，螺纹段应留出余量, 以保证螺母可以继续旋入。 2. Convenient structures for disassembly 拆装方便结构 One should consider disassembly when there is a bearing or sleeve by, for example, lowering the shaft shoulder or notching. Or one can make a s