Adopt angular displacement positive transmission to improve load carrying capacity and improve lubrication conditions. Low speed heavy-duty gears have low starting speed, oil film formation is difficult, and the probability of tooth surface wear and gluing is obviously increased. Therefore, in order to improve lubrication conditions and improve bearing capacity The low-speed heavy-duty gear should use the angular displacement positive transmission as much as possible. Compared with the standard involute gear, the two-point circular separation is smaller than the pitch circle, the full tooth height is reduced by ΔYm, the positive displacement can increase the root strength, and the pitting depth of the tooth surface appears. The area ratio is reduced. As the sum of the displacement coefficients increases, the engagement angle also becomes larger. It can be seen from the calculation analysis that the oil film thickness at the node increases when the angular displacement positive transmission is used. The larger the J, the more the oil film thickness increases, and the probability of severe wear and gluing on the tooth surface is lower.
The structure of the gear housing is improved, and the function of increasing the eccentric sleeve of the housing is to adjust the contact condition when the gear is meshed. In addition, during the use process, when the tooth surface is seriously worn and the tooth side gap exceeds the standard, the eccentric sleeve can be used to adjust the tooth side clearance. For the gear distribution box, the eccentric sleeve of the driving wheel is generally adjusted first. If the eccentric sleeve of the driving wheel is adjusted to the limit position, it is still insufficient, and then the eccentric sleeve of the passive wheel is adjusted. After the field test eccentric sleeve adjustment, the tooth surface contact spot is increased from 50 to 80 in the tooth length direction; the tooth height direction is increased from 40 to 5 or more. Therefore, for the hardened gear transmission, it is a very effective measure to adjust the contact condition by using the eccentric bushing.
Rigidity, avoiding sudden damage to the bearing Since the Fl-F7 gear distribution box has been put into production, the positioning pin of the joint of the box joint has been misaligned due to the poor rigidity of the box, and even the box body is partially deformed, resulting in poor contact of the tooth surface. To this end, the shape and size of the gear distribution box body structure is modified, mainly by strengthening the bearing part size and appropriately increasing the wall thickness, reducing the outer diameter of the eccentric sleeve, increasing the diameter of the box coupling bolt and increasing the size of the positioning pin. The effective measures significantly enhance the rigidity of the box, reduce the vibration and prevent the joint surface from being misaligned, so that the contact of the tooth surface is obviously improved, and the sudden damage of the bearing is avoided.
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