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自1955年以来,在传递交叉轴间旋转运动时,螺旋蜗轮付获得了广泛的应用。它由一圆锥蜗杆与一较大的弧齿形锥齿轮(蜗轮)构成(图1)。与普通蜗轮付相较,这种传动具有一系列的优点:结构紧凑;能传递较大扭矩;如将蜗杆或齿轮作轴向移动,可调节间隙、消除“死行程”,故能有成效地应用在精密运动链中。此外,它具有较大的重迭系数,约有10%的轮齿能同时进入啮合,故能承受较大载荷,耐磨性也更好;传动时,齿轮轮齿工作表面的瞬时接触线实际上垂直于滑动速度向量(图2),且移动速度很快,接触表面的曲率半径也较大,这就使得接触区的导热良好,且能在啮合区内形成油膜,减少磨损。
Since 1955, helical worm gears have been widely used to transmit rotational motion between cross-axes. It consists of a cone worm and a larger arc bevel gear (worm gear) (Figure 1). Compared with ordinary worm gear, this kind of transmission has a series of advantages: compact structure; can transmit large torque; such as the worm or gear for axial movement, adjustable clearance, eliminating the “dead-stroke”, it can be effective Used in precision motor chains. In addition, it has a large coefficient of overlap, about 10% of the teeth can simultaneously enter the mesh, it can withstand greater load, better wear resistance; transmission, the gear tooth surface of the instantaneous contact line actual (Figure 2), and the moving speed is very fast, and the radius of curvature of the contact surface is also large, which makes the contact area have good thermal conductivity and can form an oil film in the meshing area to reduce the wear.