Helical gears are a single kind of cylindrical gears with slanted tooth trace. In comparison to spur gears, they have the larger contact ratio and excel in quietness and less vibration and able to transmit large power. A set of helical gears has the same helix position however the helix hand is opposite.
When the reference portion of the apparatus is in the standard plane, by tilting the hobbing tool, the spur gear hobbing machine and hobbing tool can be used to create helical gears. Because of the twist of teeth, their manufacturing gets the disadvantage of more difficult production.
The helical gears created by Ever-power can be classified into two groups by the reference portion of the gears being in the rotating plane (transverse module) and normal plane (normal module). If the reference section can be in the rotating plane, the guts distance is similar to spur gears as long as they will be the same module and number of teeth. This enables for easy swapping with spur gears. However, in this case, they require special hobbing cutters and grinding stones, leading to higher production cost. However, if the reference section is certainly in the normal plane, it is possible to use spur gear hobbing equipment and grinding stones. Nevertheless, the same module and number of teeth in spur gears no more match the center distance of helical gears, and swapping becomes very hard. In addition, the center distance is usually no integer.
While spur gears usually do not generate axial helical cut gears thrust forces, due to the twist in the tooth trace, helical gears generate axial thrust force. For that reason, it really is desirable to make use of thrust bearings to soak up this force. However, combining right hands and left hands helical gears making double helical gears will remove the thrust force.
Helical gears tend to be used in auto transmissions by replacing spur gears.
Helical gears have teeth that are set upon an angle to the gear axis. The features and benefits are similar to spur gears, but can be a better choice when higher velocities are needed. Compared to spur gears, helical gears have got greater tooth strength and a higher load carrying capacity. There is also a smoother and quieter procedure because of their higher face get in touch with ratio.
Ever-power is well equipped to meet all of your helical gear requirements, whether cut or precision ground. Our manufacturing features include a wide range of sizes of tailor made helical gears with quality amounts up to AGMA Q15. Whether you need metric, diametral or other styles of gears and splines, the group at Ever-power gets the knowledge and experience to produce the high quality gearing you need.
Ground Helical Gears
Using our intensive experience and our range of state-of-the-art equipment, we can manufacture the best quality floor helical gears anywhere. Our robotically loaded threaded and profile steering wheel gear grinders work to meet high volume demands. For smaller runs, our manually loaded profile equipment grinders are manned by our highly trained staff, providing consistency over the board. We have a dedicated helical equipment design and development team, and our helical gears are produced in lean “Just with time” cells.
Capabilites
Diameter: 0.5” to 27.5”
Face: 12.9” Max
Pitch: 48 to at least one 1.7 DP
Quality: AGMA Tolerance Q15
Equipment
Cut Helical Gears
We also have an array of capabilities when it comes to cut helical gears. From high to low volume, small or large size, we can meet your requirements with our automatic to manually loaded equipment hobbers or shapers. Our clients know they can switch to us for high quality cut helical gears. Our procedures are tried and true, and we guarantee all of our products.
Capabilities
External
Diameter: 0.5” to 72.0”
Face: 24” Max
Pitch: 120 to 1 1.5 DP
Quality: AGMA Tolerance Q10
Internal
We are also capable of slicing select internal helical gears. Please contact us with specifications for account.
Besides smoother motion, higher speed capability, and less noise, another benefit that helical gears provide over spur gears is the ability to be used with either parallel or nonparallel (crossed) shafts. Helical gears with parallel shafts require the same helix angle, but opposite 
hands (i.electronic. right-handed teeth vs. left-handed teeth).
When crossed helical gears are used, they may be of possibly the same or opposite hands. If the gears have got the same hands, the sum of the helix angles should equal the angle between your shafts. The most common exemplory case of this are crossed helical gears with perpendicular (i.e. 90 degree) shafts. Both gears have the same hand, and the sum of their helix angles equals 90 degrees. For configurations with reverse hands, the difference between helix angles should the same the angle between your shafts. Crossed helical gears provide flexibility in design, however the contact between the teeth is nearer to point contact than line contact, so they have lower pressure features than parallel shaft styles.
Helical gears tend to be the default choice in applications that are suitable for spur gears but have non-parallel shafts. Also, they are utilized in applications that require high speeds or high loading. And whatever the load or speed, they often provide smoother, quieter procedure than spur gears.