阿基米德蜗杆和蜗轮在主平面(又称中间平面)相当于________与________啮合。因此蜗杆的________模数应与蜗轮的________模数相等。
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在标准蜗杆传动中,当蜗杆为主动时,若蜗杆头数z1和模数m一定时,而增大直径系数q,则蜗杆刚度________;若增大导程角γ,则传动效率________。
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