機(jī)械設(shè)計(jì)一級(jí)斜齒圓柱齒輪減速器說明書(編輯修改稿)
2025-06-10 00:56 本頁面
【文章內(nèi)容簡介】 a = ea/cos2bb = 17) 由表84得：KHb = ++103b = 18) K = KAKVKHaKHb = 1 = 19) 計(jì)算d1：d1 ≥ = = mm實(shí)際d1 = 76 。5 校核齒根彎曲疲勞強(qiáng)度：(1) 確定公式內(nèi)各計(jì)算數(shù)值： 1) 當(dāng)量齒數(shù)：ZV1 = Z1/cos3b = 21/cos3150 = ZV2 = Z2/cos3b = 50/cos3150 = 2) eaV = [(1/ZV1+1/ZV2)]cosb= [(1/+1/)]cos150 = 3) 由式825得重合度系數(shù)：Ye = + 4) 由圖826和eb = = 5) = = 前已求得:KHa = ，故取：KFa = 6) = = = 且前已求得:KHb = ，由圖812查得：KFb = 7) K = KAKVKFaKFb = 1 = 8) 由圖81818查得齒形系數(shù)和應(yīng)力修正系數(shù)：齒形系數(shù):YFa1 = YFa2 = 應(yīng)力校正系數(shù):YSa1 = YSa2 = 9) 由圖822c按齒面硬度查得大小齒輪的彎曲疲勞強(qiáng)度極限為：sFlim1 = 500 MPa sFlim2 = 380 MPa 10) 同例82：小齒輪應(yīng)力循環(huán)次數(shù):N1 = 109大齒輪應(yīng)力循環(huán)次數(shù):N2 = 108 11) 由圖820查得彎曲疲勞壽命系數(shù)為：KFN1 = KFN2 = 12) 計(jì)算彎曲疲勞許用應(yīng)力，取S=，由式815得：[sF]1 = = = [sF]2 = = = = = = = 大齒輪數(shù)值大選用。(2) 按式823校核齒根彎曲疲勞強(qiáng)度：mn≥ = = mm≤。(3) 各齒輪參數(shù)如下：大小齒輪分度圓直徑：d1 = 76 mmd2 = 181 mmb = ydd1 = 76 mmb圓整為整數(shù)為：b = 76 mm圓整的大小齒輪寬度為：b1 = 81 mm b2 = 76 mm中心距：a = mm，模數(shù)：m = mm第七部分 傳動(dòng)軸承和傳動(dòng)軸及聯(lián)軸器的設(shè)計(jì)Ⅰ軸的設(shè)計(jì)1 輸入軸上的功率P轉(zhuǎn)速n1和轉(zhuǎn)矩T1:P1 = KW n1 = 730 r/min T1 = Nm2 求作用在齒輪上的力: 已知小齒輪的分度圓直徑為:d1 = 76 mm 則:Ft = = = NFr = Ft = = 1173 NFa = Fttanb = tan150 = N3 初步確定軸的最小直徑: 先初步估算軸的最小直徑。選取軸的材料為45鋼（調(diào)質(zhì)），根據(jù)《機(jī)械設(shè)計(jì)（第八版）》表153，取A0 = 112，得：dmin = A0 = 112 = mm 顯然，輸入軸的最小直徑是安裝大帶輪處的軸徑，由于安裝鍵將軸徑增大4%，故選取:d12 = 27 mm。帶輪的寬度：B = (Z1)e+2f = (41)18+28 = 70 mm，為保證大帶輪定位可靠?。簂12 = 68 mm。大帶輪右端用軸肩定位，故取IIIII段軸直徑為:d23 = 32 mm。大帶輪右端距箱體壁距離為20，取:l23 = 35 mm。4 根據(jù)軸向定位的要求確定軸的各段直徑和長度: 初選軸承的類型及型號(hào)。為能順利地在軸端IIIIV、VIIVIII上安裝軸承，其段滿足軸承內(nèi)徑標(biāo)準(zhǔn)，故取:d34 = d78 = 35 mm；因軸既受徑載荷又受軸向載荷作用，查軸承樣本選用：30207型單列圓錐滾子軸承，其尺寸為:dDT = 3572 mm，軸承右端采用擋油環(huán)定位，由軸承樣本查得：30207。型軸承的定位軸肩高度：h = mm，故?。篸45 = d67 = 42 mm，?。簂45 = l67 = 5 mm。 齒輪的定位及安裝齒輪處軸段尺寸的確定。由于:d1≤2d56 ，所以小齒輪應(yīng)該和輸入軸制成一體，所以:l56 = 81 mm；則:l34 = T+s+al45 = +8+115 = mml78 = T+s+al67 = +8+11+25 = mm5 軸的受力分析和校核:1）作軸的計(jì)算簡圖（見圖a）: 根據(jù)30207圓錐滾子軸承查手冊得a = mm 帶輪中點(diǎn)距左支點(diǎn)距離L1 = (70/2+35+)mm = mm 齒寬中點(diǎn)距左支點(diǎn)距離L2 = (81/2++)mm = mm 齒寬中點(diǎn)距右支點(diǎn)距離L3 = (81/2+5+)mm = mm2）計(jì)算軸的支反力：水平面支反力（見圖b）：FNH1 = = = NFNH2 = = = N垂直面支反力（見圖d）：FNV1 = = = NFNV2 = = = N3）計(jì)算軸的彎矩，并做彎矩圖：截面C處的水平彎矩：MH = FNH1L2 = Nmm = 93684 Nmm截面A處的垂直彎矩：MV0 = FQL1 = Nmm = 144299 Nmm截面C處的垂直彎矩：MV1 = FNV1L2 = Nmm = 116600 NmmMV2 = FNV2L3 = Nmm = 92541 Nmm分別作水平面彎矩圖（圖c）和垂直面彎矩圖（圖e）。截面C處的合成彎矩：M1 = = 149574 NmmM2 = = 131683 Nmm作
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