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【简答题】
在下图所示的铰链四杆机构中,已知l AB = 90 mm,lBC = 210 mm,lCD = 150 mm,lAD = 170 mm,AB杆为主动件。 (1)作图表示该机构的极位夹角q 和最小传动角g min (作在试题纸上)。 (2)设l AD 的允许变化范围为10~280 mm,试分析通过改变l AD可以得到几种形式的铰链四杆机构,并给出l AD相应的范围。
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A.
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B.
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