What are the Advantages of Helical Gears?
Helical gears are types of cylindrical gears that have a slanted teeth trace. They have a large contact ratio in comparison with spur gears and they are able to transmit greater force with less noise and vibration. Do you know the advantages of helical gears?
A big advantage offered by spiral gears is through their torque capacity. By design, the spur gears are slightly weaker because their loads are transmitted over a set of fewer teeth. Helical gearing gets machined with teeth that are angled; they are then ground and hardened to obtain gear mesh of high efficiency. The gears will mesh gradually as the teeth are cut at angles. Teeth of every gear are in contact always with other gears, reducing the load on each tooth and creating smoother transition of forces from one tooth to another. This is the main reason why there is less wear, vibration and noise besides giving longer life.
The angled teeth of helical gears engage in a more gradual manner than those of the spur gears. They offer an advantage over spur gears as the leading edges of their teeth are not placed parallel to the rotational axis. This causes them to run in a smooth and a quiet manner. In the case of parallel helical gears, every teeth pair makes contact first at a single point at a side of the gear wheel. A moving contact curve then will grow slowly across the face of the tooth to a maximum. Before receding until the tooth breaks contact at one point on an opposite side. This offers an advantage over spur gears because in the case of the latter. The teeth will meet suddenly at a contact line across the whole width and this may lead to noise and stress. It has been observed that the spur gears make a typical whining sound at speeds that are high. For this particular reason, spur gears are mostly used in applications of low speed and in cases where noise control is not a big issue.
Helical gears are always preferred in applications of high speed and in situations of large power transmission. They are also used in cases where noise abatement becomes an important factor. The problems created by helical gear come in the form of resultant thrusts along the gear axis that have to be accommodated by thrust bearings and a high degree of sliding friction between meshing teeth. This is taken care of by additives in the lubricants.
DMU five-axis machining groups
Gleason Arc Milling Tooth Machine
Gleason Arc Gear Grinding Machine
C5225 vertical lathe
Germany 160K Cone gear shaping machine
Y2380A conical teeth gear shaping machine