The benefits and drawbacks of herringbone gear and its application
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We all know that the helical gear has a better bearing capacity than the spur gear, and the herringbone gear is a helical gear with opposing symmetrical directions, since the helical gear in these two directions is caused by the helical gear. Because the axial force created by the angle cancels out, the bearing supporting the gear shaft will not carry the axial force, thus the herringbone gear has a better bearing capacity. Are you aware of the benefits of herringbone gears? Let us sum them up for you.
1. The herringbone gear has a high coincidence, with at least two teeth engaged at all times.
2. The meshing process between the teeth of the herringbone cylindrical gear is excessive, with the force on the gear teeth gradually increasing from small to big, and then from large to tiny; the herringbone gear has a high bearing capacity and functions smoothly.
3. There is no or very little axial force due to the opposite direction of the tooth helix angle in the symmetrical direction of the herringbone gear.
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Herringbone gears are commonly employed in equipment with high load and reliability requirements, such as steam turbines. Pumps may also be made using herringbone teeth. Herringbone teeth are also used in the ship's propulsion gearbox.
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crossthread said: Click to expand...
Most rotating assemblys require some control of end float. As it happens in a herringbone or double helical train only one such provision is requiered. That's not to say a significant thrust thrust on the input shaft can be allowed to transmit through the gearing to be restrained by the output shaft bearings. Only the shaft intended to take thrust loads should be so loaded. The remaining shaft(s) may take small incidental thrust loads but preferably these loads should be mitigated by some other means.Case in point: We had several 60 ton rail cranes that rode on special rails set on 20 ft centers. They could straddle a Diesel locomotove. The winch house was big as a small two story house. These cranes were big for shipyard cranes, maybe 700 tons and could lift 50 tons on a 60 radius.Each crane had 16 wheel rail wheels (8 per side). Each pair was driven by a 15 HP DC motor. The drive was double reduction herringbone first reduction from the motor and chain on the second to the drive wheels. No matter how carefully the motor was set to magnetic center and how carefully the gear train was set to the motor, there was always unequal flank wear on the herringbone gears. These were reversing drives and the crane moved at a walking pace.To compensate for this, every five year overhaul cycle the drives were swapped side for side.These gears were maybe 60 years old and still in pretty good shape last I saw of them. Not bad for hand greased gearing inadequately shielded from weather and sand-blast dust.
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