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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,Structures of parts contact 接触处的结构,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。,Structures of parts contact 接触处的结构,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 small hole. 在有轴承或衬套处应考虑拆卸方便的问题，如：放低轴肩、开凹槽；或加工一个小孔等。,Removable joint structures 可拆联接结构,请点击鼠标左键显示后面内容,2) There should be enough space when there is a thread fastener so that the bolt can be removed. One should not only consider the space for the bolt, but also the space for the wrench when removing the bolt, as well as the convenience for disassembling the structure. 在装有螺纹紧固件处应留有足够的空间,以便拆装。不仅应留出拧入螺栓所需的空间，同时还应考虑拆装时所用扳手的活动范围。,To produce an annular groove (standard structure, the dimension of which can be consulted) in the hole to mount the shaft, and insert the felt ring in the groove and make it tightly in contact with the shaft for Sealing. 在装轴的孔内开出一个环槽(属标准结构, 尺寸可查设计手 册)，将毛毡圈置于槽内并与轴紧密接触, 可起密封作用。,1. Felt ring sealing device 毡圈密封装置结构,Structures of sealing devices 密封装置结构,请点击鼠标左键显示后面内容,毡圈与轴紧密接触，以防泄露,请 点 击 鼠 标 左 键 显 示 后 面 内 容,2. Stuffing box sealing device 填料函密封装置结构,To adjust the position of gland by nut to compress the stuffing tightly for sealing. when drawing, the gland shall be positioned where it is pushed by 35mm. 通过螺母调节填料压盖的位置,将填料压紧而起到密 封作用。画图时,应使填料压盖处于可调节位置,一般使其调节 量为35mm。,Structures of sealing devices 密封装置结构,无调节的余地,留有调节的余量,请 点 击 鼠 标 左 键 显 示 后 面 内 容,3. Washer sealing device 垫片密封装置结构,To adopt washer on the contact surface of two parts for sealing. If the thickness of the washer is less than or equal to 2mm, one should use an enlargement representation to clarify it. 在两零件结合面,常 采用垫片密封。当垫片厚度小于等于2mm时, 应采用夸大画法 将其涂黑。,Structures of sealing devices 密封装置结构,请点击鼠标左键显示后面内容,垫片使两零件接触面更严密而无法泄露,垫片使两零件接触面更严密而无法泄露,Exercise 练习题,Indicate what representation methods of assembly drawings and sealing devices adopted in the view? Analysis the axial fixed methods of the shaft. 指出下面装配图采用了何种装配画法和密封结构，并分析 图中轴向固定的方法。,采用了毛毡 圈密封装置,省去螺钉用了简化画法,省去螺钉用了简化画法,齿轮的两端面被轴上的台阶和螺母、垫圈沿轴向固定，不可窜动,轴承外圈被端盖上的凸缘和壳体上的台阶固定,不可沿轴向窜动,轴承内圈被轴上的台阶固定,不可沿轴向窜动,请 点 击 鼠 标 左 键 显 示 后 面 内 容,本 小 节 结 束,谢谢您的认真学习！,退出,前一页,Structures of parts contact 接触处的结构,请点击鼠标左键显示后面内容,Inappropriate 不合理,Appropriate 合 理,在垂直方向上只可以有一对接触面,在水平方向上只可以有一对接触面,请 点 击 鼠 标 左 键 显 示 后 面 内 容,两个方向上只能有一对接触面,Structures of parts contact 接触处的结构,Inappropriate 不合理,Appropriate 合 理,此面不应接触,此面不应接触,此面不应接触,此面不应接触,请 点 击 鼠 标 左 键 显 示 后 面 内 容,轴肩无法接触到端面,工作的可靠性降低,Structures of parts contact 接触处的结构,Inappropriate 不合理,Appropriate 合 理,凹槽 倒角 圆角,Removable joint structures 可拆连接结构,外螺纹终止处有退刀槽,内螺纹起始端有倒角,轴端螺纹应伸进孔里,Removable joint structures 可拆连接结构,Inappropriate 不合理,Appropriate 合 理,Removable joint structures 可拆连接结构,请 点 击 鼠 标 左 键 显 示 后 面 内 容,Inappropriate 不合理,Appropriate 合 理,衬套无法拆出,放低 轴肩,开凹槽,加大 孔径,开螺孔,开小孔,英国图例,Inappropriate 不合理,Removable joint structures 可拆连接结构,螺栓无法拆出,请 点 击 鼠 标 左 键 显 示 后 面 内 容,Appropriate 合 理,螺栓无法装入,Removable joint structures 可拆连接结构,在图片上点击鼠标左键可以“暂停”或再次“播放”,在图片上点击鼠标左键可以“暂停”或再次“播放”,在图片上点击鼠标左键可以“暂停”或再次“播放”,
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