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Heavy Duty Gearbox
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Heavy Duty Industrial
Herringbone Gear
Herringbone gear is an important part of the mechanical transmission system. with the advantages of high transmission power, high reliability. high precision and strong load-bearing capacity. plays an important role in aerospace, shipping and other heavy machinery fields.
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What is a herringbone gear？
A herringbone gear, a special type of double helical gear. It is a special type of gear that is a side-to-side combination of two opposing hand helical gears. When viewed from the top, each helical groove of this gear looks like the letter V. and many together form a herringbone pattern (like the bones of fish such as herring). Unlike helical gears, herringbone gears do not generate additional axial loads.
Like helical gears, they have the advantage of transmitting power smoothly. because more than two teeth mesh at any one time. Their advantage over helical gears is that half of the lateral thrust is balanced by the other half of the lateral thrust. This means that herringbone gears can be used in torque gearboxes without the need for a large number of thrust bearings.
Advantages of Herringbone Gears
- Herringbone gears have a high degree of overlap, with at least 2 teeth meshing at any given moment.
- The meshing process between herringbone cylindrical gear teeth is an excessive process. and the force on the gear teeth is graduallyfrom small to large, and then from large to small. herringbone gears have high load-bearing capacity and work smoothly.
- Herringbone gear theory has no or very small axial force . due to the opposite direction of tooth helix angle in the symmetry direction.
Disadvantages of Herringbone Gears
- A very obvious disadvantage of herringbone gears is the difficulty of processing. herringbone gears can not be processed byconventional gear shaping and hobbing methods.
- To manufacture more precise herringbone gears is very expensive. so that only in heavy equipment utilized it.
Applications of Herringbone Gear
Herringbone gears are generally external mesh involute herringbone cylindrical gear reducers, mainly used in heavy-duty, highly reliable equipment, such as steam turbines.
Compared with helical gears, herringbone and double helical gears have the advantage of balancing axial thrust in both directions. Therefore, they are used in industries with high load capacity requirements, such as differential gears and heavy machinery, metallurgy, mining, cement building material machinery, etc.
Precautions for Using Herringbone Gear
- In the operation of 200 ~ 300 hours, should be the beginning of the oil change. in the future use should be regularly checked the quality of the oil. for mixed with impurities or deterioration of the oil must be replaced in a timely manner. In general, for long-term continuous work of the reducer. according to the operation of 5000 hours or once a year to replace the new oil. long-term disuse of the reducer, before re-running should also be replaced with new oil. The reducer need to added to the same grade of oil as the original, not mixed with different grades of oil. the same grade and different viscosity of oil allowed to be mixed.
- oil change should wait until the reducer cools down without the risk of burning. and still keep warm, because after complete cooling. the viscosity of the oil increases, and it is difficult to drain the oil. Note: To cut off the power supply of the transmission to prevent unintentional energization.
- when found that the oil temperature rise more than 80 ℃ or oil pool temperature more than 100 ℃ . and produce abnormal noise and other phenomena should stop using. check the cause, must troubleshoot, replace the lubricant before continuing to run.
- The user should have a reasonable use of maintenance rules and regulations. the operation of the reducer and the problems found in the inspection should be carefullyrecorded. the above provisions should be strictlyenforced.
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