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一、概述在斜齿圆柱齿轮的传动中(两齿轮轴心线平行的传动),螺旋角大多在8°～20°范围内。航空机械传动一般也只有7°～25°。没有超出常用滚齿机的加工范围(一般滚齿机能加工到±45°或±60°螺旋角)。可是在螺旋齿轮传动中(两齿轮轴心线既不平行也不相交的传动),情况就不同了。虽说从单个齿轮来看与斜齿圆柱齿轮没有区别,可是为了满足中心距、齿轮外径等结构上的需要,其螺旋角也可能大于60°,超出普通滚齿机的加工范围。我厂在生产民用产品中,就碰到66°大螺旋角的齿轮,其形状如图1所示。法向模数:0.8;齿数:20;
First, an overview In the helical gear transmission (two gear axis parallel transmission), the helix angle mostly in the range of 8 ° ~ 20 °. Aerospace mechanical transmission is generally only 7 ° ~ 25 °. It does not exceed the machining range of hobbing machine (general hobbing machine can process to ± 45 ° or ± 60 ° helix angle). However, the situation is different in helical gear drive (the two gear axes are neither parallel nor intersecting). Although there is no difference from helical gear in terms of single gear, in order to meet structural requirements such as center distance and gear diameter, the helix angle may be larger than 60 °, which is beyond the machining range of ordinary gear hobbing machine. I plant in the production of civilian products, encountered a large helix angle 66 ° gears, the shape shown in Figure 1. Normal modulus: 0.8; Number of teeth: 20;