螺旋齿轮、圆柱斜齿轮 Helical gear
分析齿轮主要参数，提出用测量跨棒（）和公法线长度计算斜齿圆柱齿轮螺旋角的测绘方法，并推导出螺旋角的计算公式。
In this paper calculating method of lead angle of helical gear by measuring span length of length bar and base tangent length is put forward and lead angle calculating formula is deducel.
工业齿轮油广泛用于各种圆柱齿轮、斜齿轮、正齿轮及直、斜、螺旋伞齿轮等齿轮传动装置。
Industrial gear oils are extensively used for various gear transmission devices, such as column, bevel, spur gears and etc.
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