Problems with the gear drive in the coal grinder!
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The coal grinder is driven by gears, with the smaller gear driving the larger one. Why are the gears beveled? Why not use straight-gear designs for transmission?
I’m not an expert in equipment, but I’ll share some random thoughts – the stress issues associated with gear transmission should be taken into consideration. I’m not sure if what I say is accurate. Please ask a professional to answer.
I have expertise across three different fields, and I know a bit about equipment; in gear transmissions, helical gears operate more stably than spur gears. Helical gear drives operate smoothly, have a high load-carrying capacity, and produce low levels of noise and shock; they are suitable for high-speed, high-power gear transmissions. When straight-cylinder gears mesh, the contact line of the tooth surfaces is parallel to the gear axis. Therefore, the tooth flanks enter and exit engagement simultaneously along the entire tooth width, causing the load to be applied and removed abruptly across the tooth width. Therefore, the smoothness of gear transmission is poor, making it prone to shocks and noise.
Cylindrical gears come in straight-toothed and helical types. During gear meshing, a straight-cylinder gear can only have one pair of teeth in contact at any given time. If the precision of gear manufacturing is poor, vibrations and noise may occur ； On the other hand, helical gears may have more than two pairs of teeth in mesh. Therefore, helical gear drives are smooth in operation, have high load-bearing capacity, generate less noise and shock, and are suitable for high-speed, high-power gear transmissions.
Advantages: 1) Good meshing properties, 2) High degree of overlap, 3) A smaller minimum number of teeth required to avoid root cut compared to straight teeth. Disadvantage: An axial force is generated during operation.