Herringbone gear

A herringbone gear, a specific type of double helical gear,[1] is a special type of gear that is a side to side (not face to face) combination of two helical gears of opposite hands.[2] From the top, 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.

Like helical gears, they have the advantage of transferring power smoothly because more than two teeth will be in mesh at any moment in time. Their advantage over the helical gears is that the side-thrust of one half is balanced by that of the other half. This means that herringbone gears can be used in torque gearboxes without requiring a substantial thrust bearing. Because of this herringbone gears were an important step in the introduction of the steam turbine to marine propulsion.

Precision herringbone gears are more difficult to manufacture than equivalent spur or helical gears and consequently are more expensive. They are used in heavy machinery.

Where the oppositely angled teeth meet in the middle of a herringbone gear, the alignment may be such that tooth tip meets tooth tip, or the alignment may be staggered, so that tooth tip meets tooth trough. The latter alignment is the unique defining characteristic of a Wuest type herringbone gear, named after its inventor.

Benefits

This double-helical bevel gear was made by Citroen and installed around 1927 in small Miřejovice hydropower plant on Vltava, connecting a Francis turbine to the generator. It worked flawlessly until 2011.

Since a herringbone gear is non-linear in the teeth the gears won't slip out from grabbing one another if the axel or another force moves the gears up and down. This is also a benefit when you have machinery that needs very straight movement, because a herringbone gear is designed to 'self center' and is much less likely to skip a tooth or fall out of place. With some gears sets that use herringbone you can loose an axel and the gear will stay in place, a herring bone planetary gear system.

Manufacture

A disadvantage of the herringbone gear is that it cannot be cut by simple gear hobbing machines, as the cutter would run into the other half of the gear. Solutions to this have included assembling small gears by stacking two helical gears together, cutting the gears with a central groove to provide clearance, and (particularly in the early days) by casting the gears to an accurate pattern and without further machining. With the older method of fabrication, herringbone gears had a central channel separating the two oppositely-angled courses of teeth. This was necessary to permit the shaving tool to run out of the groove. The development of the Sykes gear shaper made it possible to have continuous teeth with no central gap. Sunderland, also in England, also produced a herringbone cutting machine. The Sykes uses cylindrical guides and round cutters; the Sunderland uses straight guides and rack-type cutters. The W.E. Sykes Co. dissolved in 1983-84. Since then it has been common practice to obtain an older machine and rebuild it if necessary to create this unique type of gear. Recently, the Bourn and Koch company has developed a CNC controlled derivation of the W.E. Sykes design called the HDS1600-300. This machine, like the Sykes gear shaper, has the ability to generate a true apex without the need for a clearance groove cut around the gear. This allows the gears to be used in positive displacement pumping applications, as well as power transmission. Helical gears with low weight, accuracy and strength may be 3d printed.

Citroën

Citroën Type A final drive herringbone pinion and crownwheel

The logo of the car maker Citroën is a graphic representation of a herringbone gear, reflecting André Citroën's earlier involvement in the manufacture of these gears. Early Mors and Citroën cars used a herringbone bevel gear final drive in the rear axle.[3]

Panhard Dyna X and successor cars (1948–67) used double helical gears in the transaxle and for the camshaft timing gears in the engine.

References

  1. ↑ DOUBLE HELICAL GEARS or "Herring bone", retrieved 2015-02-14
  2. ↑ Herringbone gears
  3. ↑ The Autocar (Ninth edition, circa 1919). Autocar Handbook. London: Iliffe & Sons. Check date values in: |date= (help)

External links