Cross Helical Gear

Crossed Helical Gears are a type of Helical Gears only. They are the typical example of two helical gears applied for transmitting power between non parallel and non-intersecting shafts. To operate a a crossed helical gears perfectly, they should possess identical pressure angle and normal pitch. However, it is not essential to have a same helix angle or to be in opposite hand only Crossed Helical Gear is only recommended for a narrow range of applications, with relatively light loads and it is better to avoid it for precision meshes. What happens is that the for the two gears contact takes place only in a point, and not a line. So the resulting high sliding loads taking place in between the teeth necessitates an extensive lubrication. Thus, it has been seen that very little power can actually be transmitted by using crossed helical gears. Cross helical gears are mounted on an intersecting shaft with the shaft angle at 90 degrees.