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【简答题】
已知轴径 d=40mm,轴上安装的齿轮宽度B=70mm,请选一普通A,并标记。 附表 普通平键、导向平键和键槽的截面尺寸及公差 轴 键 键 槽 直径 d b (h9) h (h11) L (h14) 宽 度 b 深 度 半径 r 极 限 偏 差 轴 t 毂 t 1 较联接 一般键联接 较紧键联接 轴H9 毂D10 轴N9 毂Js9 轴和毂P9 尺寸 极限偏差 尺寸 极限偏差 最小 最大 >10~12 4 4 8~45 +0.030 0 +0.078 +0.030 0 -0.036 ±0.015 -0.012 -0.042 2.5 +0.1 0 1.8 +0.1 0 0.08 0.16 >12~17 5 5 10~56 3.0 2.3 0.16 0.25 >17~22 6 6 14~70 3.5 2.8 >22~30 8 7 18~90 +0.036 0 +0.098 +0.040 0 -0.036 ±0.018 -0.015 -0.051 4.0 +0.2 0 3.3 +0.2 0 >30~38 10 8 22~110 5.0 3.3 0.25 0.40 >38~44 12 8 28~140 +0.043 0 +0.120 +0.050 0 -0.043 ±0.0215 -0.018 -0.061 5.0 3.3 >44~50 14 9 36~160 5.5 3.8 >50~58 16 10 45~180 6.0 4.3 >58~65 18 11 50~200 7.0 4.4 >65~75 20 12 56~220 +0.052 0 +0.149 +0.065 0 -0.052 ±0.026 -0.022 -0.074 7.5 4.9 0.40 0.60 >75~85 22 14 63~250 9.0 5.4 >85~95 25 14 70~280 9.0 5.4 >95~110 28 16 80~320 10.0 6.4
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