【20160414】Relationships of Gears in Mesh$ N i1 Z% ], W; l
9 q+ d- w; E) ?/ Y. `. G: X& L+ v4 y' wCenter Distance
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Pinion-the smaller gear 小齿轮
8 R. o( N8 \1 |4 z! R0 G5 H7 OBull gear or gear -the larger gear 大齿轮; Q& ?/ N0 T: _6 J; T) p. K1 b" |# o3 a
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Contact ratio( mp ): the average number of teeth that are in contact at any instant.% B0 ^: r, D! I' O- @0 n) r
重合度:任意时刻相互接触的齿数。
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Z -The length of the contact path( length of straight line)9 ~0 R D% j6 r, I# }4 t
pb-The base pitch, which is defined as the distance between corresponding points of adjacent teeth, measured on the base circle( length of arc ), `% v( {( A) D% @6 G
啮合度=接触长度(直线长度)/节距(弧线长度)
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6 `0 R+ z& @8 s# ?0 J2 I- tAn involute shape is constructed by unwinding a taut wire from a base circle., B$ B, ]7 x1 d, g' {* V
渐开线的形成方式决定了直线段KN与弧线段AN的长度相等。4 r1 O' D/ `) ~8 S$ o" C! O
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Inpractice, contact ratios should be greater than 1.2.6 H3 }3 U2 T: F b6 Z# F9 X7 ]
实际应用中,重合度应大于1.2。
% \/ {4 ^1 q& r/ e5 `A contact ratio of 1.2 indicates that one pair of teeth is always in contact and a second pair of teeth is incontact 20 percent of the time.
6 R2 l5 ~7 y9 U8 }重合度为1.2意味着,一对齿总是接触,第二对齿有20%的时间接触。: m# o7 U; J( y( S, p
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