Turbine shaftThe prerequisite for correct gearing. Today I will take you to understand what needs to be done before the worm gear reducer is properly engaged:

Because the worm gear reducer is driven by the two shafts crossing 90 degrees, but they are neither parallel nor intersecting with each other, usually when the worm gear is driven, the worm is the active part, and the worm wheel is indeed the passive part.

Because the internal structure of the worm gear reducer is relatively compact, it can generally obtain a large transmission ratio, which is generally 7-80. Moreover, it works smoothly without noise, and the transmission power range is also large, and it can be self-locking.

Therefore, the prerequisite for the correct meshing of the worm gear reducer is that the modulus and pressure angle of the worm and the worm wheel in the middle plane are equal, that is, the end face modulus of the worm wheel is equal to the axial face modulus of the worm, and it is a standard value. The end pressure angle should be equal to the axial pressure angle of the worm and the standard value, that is, =M.

When the staggered angle of the worm gear reducer is M, it is also necessary to ensure that the spiral directions of the worm wheel and the worm must be the same.

The geometric calculation of the worm gear reducer is basically the same as that of the cylindrical gear. Several issues that need to be paid attention to are that the lead angle of the worm is the tutor between the tangent of the helix on the worm index cylinder and the worm section, and the helix angle of the worm. Larger means high transmission efficiency. When it is smaller than the friction angle between meshing teeth, the mechanism will self-lock.

The meshing of the worm gear reducer is different from the transmission of the cylindrical gear. The transmission ratio of the worm gear reducer is not equal to M, but F.

The method of judging the steering of the worm wheel in the transmission of the worm gear reducer can be determined according to the direction of the meshing point, that is, the tangent line parallel to the helix, and the velocity vector triangle should be drawn perpendicular to the axis of the worm wheel. , Left-handed worm to hold with right hand. Four fingers thumb to judge.

Worm gear reducers often have Uno to transmit the movement and power between the two interleaved shafts. The worm wheel and the worm are flat in the middle and the inside is equivalent to the gear and the rack. The worm and the screw are similar in shape, so the correct meshing of the worm gear reducer is very important.