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众所周知,螺旋伞齿轮的螺旋角系指其分齿圆锥齿圈中点处的螺旋角。格里逊(Gleason)型螺旋伞齿轮,其分齿圆锥齿宽全长各处的螺旋角是个变量(大端与小端上的螺旋角值相差8～12°之多),所以在实用上不易测得其螺旋角。但对斜齿轮来说其分齿圆柱齿宽全长各处的螺旋角是一个常量,它的螺旋角是易于测得的。本文提出藉助于Tredgold法将斜齿轮螺旋角公式引用到螺旋伞齿轮上,从而解决了这个问题。它在测绘中的精确度要比文献[1]、[2]所介绍的
It is well known that the helix angle of a helical bevel gear refers to the helix angle at the midpoint of its bevel gear. The helical bevel gear of Gleason type has a variable helical angle (the difference between the helical angles on the large end and the small end is about 8 to 12 degrees) in the entire length of the tooth pitch of the tooth, so that in practice Not easy to measure the helix angle. However, for helical gears, the helical angle of the entire tooth length of the helical gear is constant, and its helix angle is easily measurable. This paper proposes to solve this problem by using the Tredgold method to refer to the helical bevel gear. Its accuracy in surveying and mapping than the literature [1], [2] introduced