Helical Inline Gear Motors Helical gears are not specifically much like worm or bevel gearbox systems. They are in fact an alternative to spur gears where the teeth are parallel to the axis of the apparatus itself. For example, within an inline application, you can have either spur OR helical gears. An inline helical gearbox motor will most likely be quieter and can carry higher loads than motors utilizing a spur gearbox. They could be more costly in initial price, and manufacturers need to account for axial thrust. However, the actual fact that the helix position may differ from 15 to 30 degrees permits flexibility in conditions of design. They are found in in-line applications as well as parallel shaft applications.

The benefit of helical gears is that it produces a rolling action, is quieter, and has less vibration compared to spur gears. In addition, it produces much less helical spiral bevel gear motor friction and allows for more tooth to be engaged simultaneously as the teeth roll across each other.
There are myriad types of gearing. Some manufactures use spur gears instead of helical gearing, for instance. However, there is not as much surface contact, as noted above and consequently there is more noise and much less torque transfer possible.

Another program where noise is usually common are planetary equipment systems, where in fact the one gear is totally within the other. In addition they require grease lubrication and they must be built with expensive materials to be able to maintain a long-lifestyle and bearing integrity. A simpler variant, internal gearing, is suffering from the same issues and can only be utilized with parallel shaft.

Finally, hypoid gearing may be best understood because similar to bevel gearing, but with the gear axes not intersecting. The sliding action can create huge amounts of heat and the alignment requires great care.