Helical helical spiral bevel gear motor inline Gear Motors Helical gears are not specifically comparable to worm or bevel gearbox systems. They are actually an alternative to spur gears where the tooth are parallel to the axis of the apparatus itself. For example, in an inline application, you could have either spur OR helical gears. An inline helical gearbox electric motor will most likely be quieter and will carry higher loads than motors using a spur gearbox. They may be more costly in initial cost, and manufacturers need to account for axial thrust. Nevertheless, the actual fact that the helix angle may differ from 15 to 30 degrees allows for flexibility when it comes to design. They are found in in-line applications and also 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 friction and allows for more the teeth to be engaged concurrently as one’s teeth roll across each other.
There are myriad types of gearing. Some manufactures use spur gears instead of helical gearing, for example. However, there is not as much surface contact, as noted above and because of this there is more noise and much less torque transfer possible.

Another program where noise is common are planetary gear systems, where in fact the one gear is completely within the other. In addition they require grease lubrication plus 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 problems and can only be used with parallel shaft.

Finally, hypoid gearing may be best understood as similar to bevel gearing, but with the gear axes not intersecting. The sliding actions can create large amounts of temperature and the alignment needs great care.