QB 1220-1991自行车米制螺纹和量规.pdf

中华人民共和国行业标准QB 1220~-91自行车米制螺纹和量规主题内容与适用范围本标准规定了自行车用的各种成品零件上的米制螺纹的基本牙型、基本尺寸、公差与基本偏差，并规定了自行车用米制螺纹的量规与其制造尺寸。年本标准适用于自行车用的米制螺纹；并适用于检验本标准中规定的米制螺纹尺寸和公差用的螺纹量规。-2 引用标准- *GB 192普通螺纹基本牙型GB 196普通螺纹基本尺寸GB197　普通螺纹公差与配合GB 2515普通螺纹‧术语GB 2516普通螺纹偏差表GB 3934普通螺纹量规自行车米制螺纹33.1基本牙型H = V3/2P= 0.866025404P-5H/8 = 0.541265877P3H/8 = 0.324759526PH81H/4 = 0.216506351P丑860°1H/8 = 0.108253175P1830°D2 = D - 2 ×3H/8Pdz= d - 2 ×3H/84nD, = D - 2 ×5H/8是d, = d - 2 ×5H/811-螺纹轴线D一内螺纹大径；d一外螺纹大径；D2一内螺纹中径；d²一外螺纹中径,D,一内螺纹小径，d,一-外螺纹小径，P一螺距；H一原始三角形高度3.2螺纹牙底形状螺纹牙底形状应符合GB197中9，10，11章的有关规定。1992—04—01实施中华人民共和国轻工业部1991一09—10批准-15— QB 1220--913.3基本尺寸（见表1）表1nmm距蝶大,径中径径小公称直径应用示例RD或dD,或d,D,或d,2.1*0.452.1461.8541.65915号辐条、条母2.3*0.452.3492.0571.86214号辐条、条母:2.6*0.452.6542.3622.167条母13号辐条、3事*30.502.6752.45912号辐条、条母3.20.503.2002.8752.65911号辐条、条母3.60.603.6003.2102.95010号辐条、条母案素44.0.703.5453.242涨闸拉杆0.80554.4804.134泥板支棍、涨闸拉杆1665.3504.917紧闸螺钉鲁峰770.756.5136.188前后闸拉管7木美16.3505.917闸把托架187.3506.917前轴棍81.257.1886.647鞍座夹紧螺栓110108.9179.350轴棍1111110.3509.917脚澜后轴辊141.251413.18812.647脚瞪轴、曲柄事*18 11817.35016.917A型中轴棍2412423.35022.917外五速盖板12626:25.35024.917前叉立管、上挡--事意3313332.35031.917脚闸右大挡3413432.91733.350赛车右后轴身、锁紧母353534.35033.917后轴身、中轴、飞轮芯子、中接头3813837.35036.91716牙飞轮芯子、丝挡*毒1393938.35037.917飞轮芯子42**14241.35040.917多级外变速飞轮外套56**15655.35054.917内变速棘齿盖注：*公称直径为参考尺寸，不等于工件大径尺寸。业为本标准对GB 196的选用。-16- QB 1220-913.4极限尺寸和公差外螺纹极限尺寸和公差（见表2）3.4.1表 2mm中径大径公称最大螺距公差带直径小径最大公差最小公差最大最小0.0711.7632.10.456g6e1.6361.8342.0960.1001.996- ‘0.456g6e1.8392.0370.0711.9660.1002.32.2992.199:0.456g6e2.1442.3420.0712.2712.6040.1002.5042.6、30.506g2.4352.6550.0752.5802.9800.1062.874A0.506g2.6352.8550.0753.1800.1063.22.7803.0743.5790.1253.60.606g2.9233.1890.0853.1043.4540.706g3.2113.5230.0903.4333.9780.1403.83844.9760.1504.82650.806g4.0984.4560.0954.36114.8750.1805.79466g5.3240.1125.2125.97470.756.1586.4910.1006.3916.9780.1406.8386g10.1806.79476g5.8756.3240.1126.2126.9747.79416.8757.2127.9740.18086g7.3240.1126.5927.0427.9720.2127.76081.256g7.1600.11819.794106g8.8759.3240.1129.2