【正文】 大齒輪的彎曲強(qiáng)度極限3802 ?FE? MPa. 2) 由圖 1018 取彎曲疲勞壽命系數(shù) 1FNK = 2FNK = 3) 計(jì)算彎曲疲勞許用應(yīng)力 取彎曲疲勞安全系數(shù) S=，由式（ 1012）得 ? ? 0 5 0 MPSK FEIFNF ???? ?? ? ? MPSK FEFNF ???? ?? 4) 計(jì) 算載荷系數(shù) FbFaVA KKKKK ? =1 1 = 5) 查取齒形系數(shù) 由表 105 查得 1FaY = 2FaY = 6) 查應(yīng)力校正系數(shù)。大齒輪的接觸疲勞強(qiáng)度極限 550im2 ?HL? MPa 6) 由式 1013 計(jì)算應(yīng)力循環(huán)次數(shù) hjLN 11 n60? =60 1430 1（ 2 8 300 8） = 910 892 108 8 2 102 9 4 ????N 7) 由圖 1019 取接觸疲勞壽命系數(shù) 1HNK = 2HNK = 8) 計(jì)算接觸疲勞許用應(yīng)力 取失效概率為 1％，安全系數(shù) S=1。于是由 ???? 1 14c os11 ?nmdz ? 取 1z =28，則 2z = 1z .i= 28= 取 2z =118 1) 計(jì)算 中心矩 2 5 o s2 11 1 828c o s2 )( 21 ?? ????? ?）（? nmzza mm 2) 按圓整后的中心距修正螺旋角 ?? ????? 1)11828(a r c c o s2 )(a r c c o s 21 a mzz n? 14186。由表104 查得 HBK 的值與直齒齒輪相等，故 HBK = smv /? 西南大學(xué)育才學(xué)院機(jī)械設(shè)計(jì)課程設(shè)計(jì) 機(jī)械設(shè)計(jì)制造及其自動(dòng)化 17 由圖 1013 查得 FBK = 由表 103 查得 FaH KK ?a = 。初選螺旋角 β =14186。 計(jì)算電機(jī)的功率 選擇電動(dòng)機(jī)功率 Ped 設(shè)：工作機(jī)（卷筒）所需功率 PW ，卷筒效率 η w，電機(jī)至卷筒軸Ⅲ的傳動(dòng)總效率 ηa（減速器效率），電機(jī)需要的功率 Pd。并且不能準(zhǔn)確的改變速度的對(duì)應(yīng)值。 優(yōu)點(diǎn)： 齒輪傳動(dòng)具有傳遞速度和功率的范圍廣；傳動(dòng)比穩(wěn)定，傳動(dòng)效率高；工作可靠，使用壽命長(zhǎng)；結(jié)構(gòu)緊湊等優(yōu)點(diǎn)。 摩擦傳動(dòng)： 當(dāng)主動(dòng)輪轉(zhuǎn)動(dòng)時(shí)，由于帶和帶輪間的摩擦力，便拖動(dòng)從動(dòng)輪一起轉(zhuǎn)動(dòng)，并傳遞動(dòng)力（平帶和Ｖ帶傳動(dòng)）。但是必須具備相應(yīng)的電源。軸向尺寸大，要求兩級(jí)傳動(dòng)中心距相同。 傳動(dòng)方案 比較與分析 名稱(chēng) 運(yùn)動(dòng)簡(jiǎn)圖 推薦傳動(dòng)比 缺點(diǎn)及其應(yīng)用 轉(zhuǎn)開(kāi)式 i=8~40 應(yīng)用廣泛、結(jié)構(gòu)簡(jiǎn)單，高速級(jí)常用斜齒。 5%。 綜合運(yùn)用機(jī)械設(shè)計(jì)基礎(chǔ)、機(jī)械制造基礎(chǔ)的知識(shí)和繪圖技能，完成傳動(dòng)裝置的測(cè)繪與分析，通過(guò)這一過(guò)程全面了解一個(gè)機(jī)械產(chǎn)品所涉及的結(jié)構(gòu)、強(qiáng)度、制造、裝配以及表達(dá)等方面的知識(shí)，培養(yǎng)綜合分析、實(shí)際解決工程問(wèn)題的能力。mm ） ......................................................................................................................................14 6 齒輪傳動(dòng)的設(shè)計(jì)計(jì)算 .......................................................................................................................................................... 15 高級(jí)齒輪傳動(dòng)的設(shè)計(jì)計(jì)算 .........................................................................................................................................15 低速級(jí)齒輪傳動(dòng)的設(shè)計(jì)計(jì)算 ....................................................................................................................................20 齒輪結(jié)構(gòu)設(shè)計(jì)和零件圖 .............................................................................................................................................24 驗(yàn)算傳動(dòng)系統(tǒng)速度誤差 ................................................................................................................................................... 24 ....................................................................................................................................................................... 25 高速軸的設(shè)計(jì)計(jì)算 ......................................................................................................................................................25 低速軸的設(shè)計(jì)計(jì)算 .......................................................................................................................................................29 中間軸的設(shè)計(jì)計(jì) 算 ......................................................................................................................................................36 .............................................................................................................................................................. 44 滾動(dòng)軸承的選擇 ..........................................................................................................................................................44 高速軸上軸承的校核 ..................................................................................................................................................44 中間軸上軸承校核 .......................................................................................................................................................45 輸出軸上軸承校核 ......................................................................................................................................................46 ..................................................................................................................................................................... 47 ..............................................................................................................................47 西南大學(xué)育才學(xué)院機(jī)械設(shè)計(jì)課程設(shè)計(jì) 機(jī)械設(shè)計(jì)制造及其自動(dòng)化 3 ..............................................................................................................................47 ....................................................................................................................................................... 48 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