90 度，可是相互既不平行也不相交的状况下，平常在蜗轮传动的时辰，蜗杆是积极件，而蜗轮着实被迫件。 Because the worm gear and worm reducer are intertwined at 90 degrees when the two axes are driven , but under the condition that they are neither parallel or intersecting with each other, usually when the worm gear is driven, the worm is the active part, and the worm gear is really forced. 7-80 。 Because the internal structure of the worm reducer is compact, it can usually achieve a large transmission ratio, usually 7-80 . And the work is stable and no noise, the power boundary of the transmission is also very large, may wish to self-lock.
=M 。 Therefore, the precise meshing condition of the worm and worm slower is that the modulus and pressure angle of the worm and the worm gear meshing in the middle plane are equivalent, that is, the end face modulus of the worm gear is equal to the worm shaft modulus, and it is a guideline value. The pressure angle of the end surface of the worm gear should be equal to the pressure angle of the axial surface of the worm and is a guideline value, that is, = M. M 时，还需求保证蜗轮与蜗杆的螺旋线旋向一定相同。 When the interleaving angle of the worm gear and worm reducer is M , it is also necessary to ensure that the spiral directions of the worm gear and the worm must be the same.
The geometry calculation of the worm reducer is basically the same as that of the spur gear. Several issues that need attention are the worm guide angle is a tutor between the tangent of the helical line on the worm indexing cylinder and the worm section. If the helix angle is large, the transmission efficiency is high. When it is smaller than the collision angle between the meshing teeth, the tissue will self-lock. M ，而是 F 。 The meshing of the worm and worm reducer is different from the transmission of cylindrical gears. The worm and worm reducer's transmission ratio is not equal to M , but F.
The way to determine the worm wheel steering in the transmission of worm and worm reducer may be based on the target of the meshing point, that is, the tangent line parallel to the spiral, and there is still a speed vector triangle drawn perpendicular to the worm gear axis. Grip, left hand worm to hold. Four-finger thumb.
Worm and worm reducers usually have Onuos to convey the movement and power between two interlaced shafts. Worms and worms are equivalent to gears and racks when they are flat in the middle, and the worms are similar to the form of screws, so the precise meshing of the worm and worm slower is very important.