Introduction of the Cylindrical Worm

  Cylindrical worm
  Cylindrical worm drive is the worm indexing surface is a cylindrical surface of worm drive.
   The commonly used Archimedes cylindrical worm drive with circular arc tooth cylindrical worm drive.
Archimedes worm tooth profile of Archimedes spiral, the axial tooth profile is straight. Archimedes worm can use ladder turning on lathe, so simple, but it is difficult to grind, so accuracy is not high. Archimedes in the cylindrical worm drive, the angle between the worm and the worm wheel tooth surface contact line and the relative sliding velocity is very small, not easy to form a lubricating oil film, so the low bearing capacity.
   The arc tooth cylindrical worm gearing is a worm shaft surface (or method) for the concave circular arc tooth profile and the worm tooth profile is convex arc worm drive. In this drive, between the contact line and the relative sliding velocity angle is large, it is easy to form a lubricating oil film, and the convex and concave tooth profile meshing tooth profile, the contact line equivalent curvature radius is larger, the contact stress is low, so the carrying capacity and efficiency than other cylindrical worm drive for high.

Spur Gears

  The main parameters
  Parameters and geometric sizes of various types of cylindrical worm drive is basically the same. As the main parameters of Archimedes cylindrical worm drive. The plane perpendicular to the axis of the worm and worm gear axis, known as the middle plane. In the middle of the plane, [1] tooth worm is a straight line, the tooth profile involute worm gear, meshing worm and worm wheel meshing is equivalent to the rack and involute gear. Therefore, parameters and geometric dimensions of worm gear calculation and roughly the same gear transmission, and parameters and dimensions in the design and manufacture with the middle plane as a reference.
   Axial tooth worm and worm gear from the pX should end week section PT are equal, so the axial modulus worm and worm gear end module should be equal, represented by m, m shall be taken as the standard value. The axial pressure angle pressure should be equal to the end of the worm worm gear angular, with α, α =20 ° usually standard pressure angle
   Worm corresponds to the screw, the screw thread is also divided into left and right, single head and long. Usually the worm number Z1=1 ~ 4, head number efficiency is high; but the number is too much, such as Z1>4, indexing error will increase, and not easy to machining. The number of teeth of Z2=iZ1 worm, I worm gear transmission ratio, i=n1/n2=Z2/Z1.
   For the worm drive in general to transfer power, Z2=27 ～ 80. When Z2<27, the worm wheel tooth easily undercut; while the Z2 is too large, may cause the worm gear tooth bending strength is not enough. D1 worm indexing circle diameter, then screw worm indexing columns lift angle λ press type for introducing q=Z1/tg lambda in the formula, pitch diameter can be obtained for d1=qm worm. Type q is called the worm characteristic coefficient. In order to limit the number of standard hob, collocation and each module of the Q value. Usually, q=6 ～ 17. Worm gear pitch circle diameter of d2=Z2m.
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