(Important Gear Terminology and Gear Nomenclature in this picture) The history of gears is old and the use of gears already appears in ancient Greece in B.C. Also, they can be classified by shaft positions as parallel shaft gears, intersecting shaft gears, and non-parallel and non-intersecting shaft gears. Gears can be classified by shape as involute, cycloidal and trochoidal gears. By meshing a pair of these elements, they are used to transmit rotations and forces from the driving shaft to the driven shaft. But in addition to these, there are other types such as face gear, herringbone gear (double helical gear), crown gear, hypoid gear, etc.Ī gear is a kind of machine element in which teeth are cut around cylindrical or cone shaped surfaces with equal spacing. It is best to start with the general knowledge of the types of gears as shown below. If it is difficult to view PDF, please consult these sections. has its own additional explanation regarding the respective gear type. In addition to the list below, each section such as worm gear, rack and pinion, bevel gear, etc. Even after choosing the general type, it is important to consider factors such as: dimensions (module, number of teeth, helix angle, face width, etc.), standard of precision grade (ISO, AGMA, DIN), need for teeth grinding and/or heat treating, allowable torque and efficiency, etc.īesides this page, we present more thorough gear technical information under Gear Knowledge (separate PDF page). It is necessary to accurately understand the differences among gear types to accomplish necessary force transmission in mechanical designs. These can be broadly classified by looking at the positions of axes such as parallel shafts, intersecting shafts and non-intersecting shafts. There are many types of gears such as spur gears, helical gears, bevel gears, worm gears, gear rack, etc.
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