Herringbone Gears

Large Diameter Alloy Steel Herringbone Gear

A herringbone gear, a specific type of double helical gear, is a side to side (not face to face) combination of two helical gears of opposite hands. Each helical groove of this gear looks like the letter V, and many together form a herringbone pattern (resembling the bones of a fish such as a herring). Unlike helical gears, herringbone gears do not produce an additional axial load.
Applications of Herringbone gear include transmission of high torque, heavy machinery, gas turbines, heavy-duty vehicles, torque gearboxes, etc. Apart from these, some of the other uses of these Herringbone gears include :

  1. The herringbone gears are used in the torque gearbox.
  2. Used in a steam turbine to marine propulsion.
  3. It is used in roller shafts in steel mills.

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Herringbone gear is a kind of cylinder. It is a right-handed tooth in a particular part of the tooth width, and the other end is a left-handed tooth in the tooth width. Herringbone gear has a more substantial bearing capacity, relatively high transmission balance, and smaller axial load. It has a wide application and importance in the transmission system of heavy machinery in marine engineering. Herringbone gear shaft can be manufactured separately on both sides according to needs and only then reassembled; Or make both sides into a whole, but this will leave an overpass groove at the bite position of both sides can be manufactured by gear shaping. Still, it also needs to disconnect the tooth surfaces on both sides. Herringbone gear’s manufacturing and processing technology are relatively complex, and the processing difficulty coefficient is relatively high. Generally, the method with high frequency is the finger gear milling cutter processing method.

In the process of herringbone gear processing, it should be noted that the herringbone gear shaft must be positioned in the process of assembly, and the position error of the herringbone center plane needs to be controlled within the standard of assembly adjustment so that the herringbone gear can achieve better effect in gear transmission.

Generally speaking, the large herringbone gear used frequently in offshore engineering projects is 34crni1mo material. The following points should be paid attention to in the manufacturing process;

(1) The modulus m of large herringbone gear shall be between 28-36mm;

(2) The helix angle of herringbone gear shall be controlled between 20-28 °;

(3) The tooth surface hardness of large herringbone gear should be controlled between 240-280hb;

(4) The error between the standard regular lines of the left and right herringbone gears should also be controlled. Generally, the standard average line error should be less than 0.1mm.

In the manufacturing process, normalizing technology is required after the forging blank is finished, mainly because the grain size of the herringbone gear material needs to be refined, which can reduce the deformation of the herringbone gear in the subsequent quenching and tempering process. Before the quenching and tempering treatment, it is also necessary to add a rough hobbing process so that the herringbone gear can ensure that the root position of the herringbone gear can achieve good comprehensive mechanical performance after the heat treatment process and the surface hardness can meet the requirements of the project. In addition, after the quenching and tempering process, the lathe processing process (finish turning and semi-finish turning) needs to be added. This process is mainly to control the heat generated in the drilling process to control the positioning of internal roundness in the large thin-walled herringbone gear. After the drilling process, the finish turning process needs to be added. Only in this way can we solve some unnecessary problems.