1、Rationality of Fitting Structure 裝配結(jié)構(gòu)的合理性,Structures of parts contact 接觸處的結(jié)構(gòu) Removable joint structures 可拆聯(lián)接結(jié)構(gòu) Structures of sealing devices 密封裝置結(jié)構(gòu) Exercises 練習(xí)題,請(qǐng)點(diǎn)擊相應(yīng)標(biāo)題顯示其內(nèi)容,Structures of parts contact 接觸處的結(jié)構(gòu),1) If two parts assemble in the same direction, there should be only one pair of contact s

2、urfaces, thus, reliable contact of the parts can be ensured, the processing requirements lowered and the cost reduced. 兩個(gè)零件在同一方向上，只允許有一對(duì)接觸面。這樣既 保證了零件的可靠接觸，又降低了加工要求和成本。,Quantity of the contact surface 接觸面的結(jié)構(gòu),請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)容,2) Two tapered parts are permitted to have only one contact surface in two dire

3、ctions (axial or radial). therefore, it can ensure a stable contact surface. 兩個(gè)圓錐體零件在兩個(gè)方向(軸向、徑向)上只允許有一 對(duì)接觸面。這樣, 就能確保這對(duì)接觸面穩(wěn)定接觸。,Structures of parts contact 接觸處的結(jié)構(gòu),2. Structure of a contact surface corner 接觸面轉(zhuǎn)角處的結(jié)構(gòu),When two parts contact with a pair of surfaces having a right-angle crossing each other

4、, it is a must to machine a chamfer, groove or round at the corner of the contact surface of the two parts. 當(dāng)兩個(gè)零件上有一對(duì)垂直相交的表面接觸時(shí)，應(yīng)在轉(zhuǎn)角處 制出倒角、溝槽或圓角，否則難以保證接觸良好。,請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)容,When drawing, one should ensure that the external thread fully goes into the internal thread. The external thread should have an

5、escape or the internal thread should have a chamfer. 要使外螺紋全部擰入內(nèi)螺紋中，外螺紋終止處應(yīng)有退刀槽, 內(nèi)螺紋起始端應(yīng)有倒角。,1. Reliable joint structures 可靠聯(lián)接結(jié)構(gòu),Removable joint structures 可拆聯(lián)接結(jié)構(gòu),請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)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 t

6、he nut can move forward. 當(dāng)軸端為螺紋聯(lián)接時(shí)，螺紋段應(yīng)留出余量, 以保證螺母可以繼續(xù)旋入。,2. Convenient structures for disassembly 拆裝方便結(jié)構(gòu),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. 在有軸承或襯套處應(yīng)考慮拆卸方便的問(wèn)題，如：放低軸肩、開凹槽；或加工一個(gè)小孔等。,

7、Removable joint structures 可拆聯(lián)接結(jié)構(gòu),請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)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

8、 the structure. 在裝有螺紋緊固件處應(yīng)留有足夠的空間,以便拆裝。不僅應(yīng)留出擰入螺栓所需的空間，同時(shí)還應(yīng)考慮拆裝時(shí)所用扳手的活動(dòng)范圍。,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. 在裝軸的孔

9、內(nèi)開出一個(gè)環(huán)槽(屬標(biāo)準(zhǔn)結(jié)構(gòu), 尺寸可查設(shè)計(jì)手 冊(cè))，將毛氈圈置于槽內(nèi)并與軸緊密接觸, 可起密封作用。,1. Felt ring sealing device 氈圈密封裝置結(jié)構(gòu),Structures of sealing devices 密封裝置結(jié)構(gòu),請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)容,氈圈與軸緊密接觸，以防泄露,請(qǐng) 點(diǎn) 擊 鼠 標(biāo) 左 鍵 顯 示 后 面 內(nèi) 容,2. Stuffing box sealing device 填料函密封裝置結(jié)構(gòu),To adjust the position of gland by nut to compress the stuffing tightly for seal

10、ing. when drawing, the gland shall be positioned where it is pushed by 35mm. 通過(guò)螺母調(diào)節(jié)填料壓蓋的位置,將填料壓緊而起到密 封作用。畫圖時(shí),應(yīng)使填料壓蓋處于可調(diào)節(jié)位置,一般使其調(diào)節(jié) 量為35mm。,Structures of sealing devices 密封裝置結(jié)構(gòu),無(wú)調(diào)節(jié)的余地,留有調(diào)節(jié)的余量,請(qǐng) 點(diǎn) 擊 鼠 標(biāo) 左 鍵 顯 示 后 面 內(nèi) 容,3. Washer sealing device 墊片密封裝置結(jié)構(gòu),To adopt washer on the contact surface of two part

11、s for sealing. If the thickness of the washer is less than or equal to 2mm, one should use an enlargement representation to clarify it. 在兩零件結(jié)合面,常 采用墊片密封。當(dāng)墊片厚度小于等于2mm時(shí), 應(yīng)采用夸大畫法 將其涂黑。,Structures of sealing devices 密封裝置結(jié)構(gòu),請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)容,墊片使兩零件接觸面更嚴(yán)密而無(wú)法泄露,墊片使兩零件接觸面更嚴(yán)密而無(wú)法泄露,Exercise 練習(xí)題,Indicate what repr

12、esentation methods of assembly drawings and sealing devices adopted in the view? Analysis the axial fixed methods of the shaft. 指出下面裝配圖采用了何種裝配畫法和密封結(jié)構(gòu)，并分析 圖中軸向固定的方法。,采用了毛氈 圈密封裝置,省去螺釘用了簡(jiǎn)化畫法,省去螺釘用了簡(jiǎn)化畫法,齒輪的兩端面被軸上的臺(tái)階和螺母、墊圈沿軸向固定，不可竄動(dòng),軸承外圈被端蓋上的凸緣和殼體上的臺(tái)階固定,不可沿軸向竄動(dòng),軸承內(nèi)圈被軸上的臺(tái)階固定,不可沿軸向竄動(dòng),請(qǐng) 點(diǎn) 擊 鼠 標(biāo) 左 鍵 顯 示 后 面

13、內(nèi) 容,本 小 節(jié) 結(jié) 束,謝謝您的認(rèn)真學(xué)習(xí)！,退出,前一頁(yè),Structures of parts contact 接觸處的結(jié)構(gòu),請(qǐng)點(diǎn)擊鼠標(biāo)左鍵顯示后面內(nèi)容,Inappropriate 不合理,Appropriate 合 理,在垂直方向上只可以有一對(duì)接觸面,在水平方向上只可以有一對(duì)接觸面,請(qǐng) 點(diǎn) 擊 鼠 標(biāo) 左 鍵 顯 示 后 面 內(nèi) 容,兩個(gè)方向上只能有一對(duì)接觸面,Structures of parts contact 接觸處的結(jié)構(gòu),Inappropriate 不合理,Appropriate 合 理,此面不應(yīng)接觸,此面不應(yīng)接觸,此面不應(yīng)接觸,此面不應(yīng)接觸,請(qǐng) 點(diǎn) 擊 鼠 標(biāo) 左 鍵 顯 示

14、 后 面 內(nèi) 容,軸肩無(wú)法接觸到端面,工作的可靠性降低,Structures of parts contact 接觸處的結(jié)構(gòu),Inappropriate 不合理,Appropriate 合 理,凹槽 倒角 圓角,Removable joint structures 可拆連接結(jié)構(gòu),外螺紋終止處有退刀槽,內(nèi)螺紋起始端有倒角,軸端螺紋應(yīng)伸進(jìn)孔里,Removable joint structures 可拆連接結(jié)構(gòu),Inappropriate 不合理,Appropriate 合 理,Removable joint structures 可拆連接結(jié)構(gòu),請(qǐng) 點(diǎn) 擊 鼠 標(biāo) 左 鍵 顯 示 后 面 內(nèi) 容,Inappropriate 不合理,Appropriate 合 理,襯套無(wú)法拆出,放低 軸肩,開凹槽,加大 孔徑,開螺孔