Patented by Andre Citroen around 1900, and still indispensable today in many industries, double helical gears are used in all sorts of sizes in a variety of sectors. From tiny dimensions in the aerospace industry to huge dimensions in energy or conveyance technology, they combine the advantages of spur and helical gears: quiet-running, low-noise and low-wear, with a high gear efficiency and suitable for transferring large forces. A distinction is made between so-called herringbone and double helical gears. The latter have a gap between the two gears. The classic production method, particularly for gears with larger dimensions, is planing. However, the longserving planing machines are no longer built, so there is an increasing tendency to choose alternative production methods such as shaping or-for very large dimensions-4-axis hobbing.
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