Helical gears are 1 kind of cylindrical gears with slanted tooth trace. Compared to spur gears, they have the larger contact ratio and excel in quietness and much less vibration and able to transmit large force. A couple of helical gears gets the same helix position but the helix hand is certainly opposite.

When the reference section of the gear 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 tooth, their manufacturing gets the disadvantage of more challenging production.

The helical gears made by Ever-power could be classified into two groups by the reference section 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 center distance is identical to spur gears so long as they are the same module and quantity of teeth. This allows for easy swapping with spur gears. However, in this case, they might need unique hobbing cutters and grinding stones, resulting in higher production cost. On the other hand, if the reference section is certainly in the standard plane, it is possible to use spur equipment hobbing tools and grinding stones. Nevertheless, the same module and amount of teeth in spur gears no longer match the center range of helical gears, and swapping becomes very hard. In addition, the center distance is usually no integer.

While spur gears do not generate axial thrust forces, due to the twist in the tooth trace, helical gears produce axial thrust force. As a result, it is desirable to use thrust bearings to absorb this force. However, combining right hands and left hands helical gears making dual helical gears will remove the thrust force.
Helical gears tend to be used in automotive transmissions by replacing spur gears.
Helical gears have teeth that are arranged 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 required. In comparison to spur gears, helical gears have got greater tooth strength and an increased load carrying capacity. They also have a smoother and quieter operation because of their higher face get in touch with ratio.

Ever-power is well equipped to meet all your helical gear requirements, whether cut or precision ground. Our manufacturing features include a wide selection of sizes of tailor made helical gears with quality levels up to AGMA Q15. Whether you need metric, diametral or other styles of gears and splines, the team at Ever-power has the knowledge and encounter to produce the high quality gearing you need.

Ground Helical Gears
Using our comprehensive experience and our range of state-of-the-art equipment, we are able to manufacture the highest quality surface helical gears anywhere. Our robotically loaded threaded and profile steering wheel gear grinders function to meet high volume needs. For smaller runs, our manually loaded profile equipment grinders are manned by our highly trained staff, providing consistency across the board. We have a dedicated helical gear design and development group, and our helical gears are produced in lean “Just in Time” cells.

Diameter: 0.5” to 27.5”
Face: 12.9” Max
Pitch: 48 to 1 1.7 DP
Quality: AGMA Tolerance Q15
Cut Helical Gears
We also have an array of capabilities with regards to cut helical gears. From high to low quantity, small or large size, we can meet your requirements with this automated to manually loaded gear hobbers or shapers. Our clients know they can change to us for high quality cut helical gears. Our procedures are old, and we guarantee our products.


Diameter: 0.5” to 72.0”
Face: 24” Max
Pitch: 120 to at least one 1.5 DP
Quality: AGMA Tolerance Q10

We are also with the capacity of reducing select internal helical gears. Please e mail us with specifications for concern.

Besides smoother movement, higher speed capacity, and less noise, another benefit that helical gears provide more than spur gears may be the helical cut gears 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 can be of possibly the same or opposite hands. If the gears have the same hands, the sum of the helix angles should equivalent the angle between your shafts. The most typical exemplory case of this are crossed helical gears with perpendicular (i.e. 90 degree) shafts. Both gears have the same hands, and the sum of their helix angles equals 90 degrees. For configurations with opposite hands, the difference between helix angles should the same the angle between the shafts. Crossed helical gears offer flexibility in design, however the contact between teeth is nearer to point get in touch with than line contact, therefore they have lower force capabilities than parallel shaft styles.

Helical gears are often the default choice in applications that are suitable for spur gears but have nonparallel shafts. They are also utilized in applications that require high speeds or high loading. And regardless of the load or rate, they often provide smoother, quieter procedure than spur gears.