Cross Helical Gears

Manufacturing

Characteristics

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.

Manufacturing Cross Helical Gears
Generally, the Crossed Helical Gears are offered in four types of materials:

• Steel
• Stainless Steel
• Cast aluminum
• Bronze
• Nylon

Characteristics of Cross Helical Gears

• Precision rating is poor
• Skewed shafting
• High sliding
• Low speeds
• Only point contact
• Lighter loads
• Comparatively low velocity ratio
• Principally used for allowing wide variety of speed ratios without changing center distance or gear size
• Very good adaptability of crossed helical gears allows them to get over many of the difficulties in a speed-reducer design

Gear design of Crossed Helical Gear Box This particular Crossed helical Gear is applied in agricultural equipment. The unparalleled freedom of a Direct Gear Design has now made it possible for replacing old styled metal chain drive with a plastic Gear drive with a flexible shaft that is cheaper, safe, as well as free from maintenance.