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 less vibration and able to transmit large pressure. A set of helical gears gets the same helix angle however the helix hand is certainly opposite.

When the reference portion of the gear is in the normal plane, by tilting the hobbing tool, the spur gear hobbing machine and hobbing tool can be used to create helical gears. Due to the twist of the teeth, their manufacturing has the disadvantage of more difficult 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 is definitely in the rotating plane, the center distance is identical to spur gears as long as they will be the same module and amount of teeth. This allows for easy swapping with spur gears. However, in this case, they might need special hobbing cutters and grinding stones, resulting in higher production cost. On the other hand, if the reference section can be in the normal plane, you’ll be able to use spur gear hobbing tools and grinding stones. However, the same module and quantity of teeth in spur gears no more match the center distance of helical gears, and swapping turns into very hard. In addition, the guts distance is usually no integer.

While spur gears do not generate axial thrust forces, because of the twist in the tooth trace, helical gears create axial thrust force. As a result, it really is desirable to use thrust bearings to absorb this force. Nevertheless, combining right hands and left hand 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 arranged on an angle to the gear axis. The features and benefits are similar to spur gears, but can be a better option when higher velocities are needed. Compared to spur gears, helical gears possess greater tooth strength and a higher load carrying capacity. They also have a smoother and quieter operation due to their higher face contact ratio.

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

Ground Helical Gears
Using our extensive experience and our selection of state-of-the-art equipment, we are able to manufacture the highest quality floor helical gears anywhere. Our robotically loaded threaded and profile steering wheel gear grinders function to meet high volume demands. For smaller operates, our manually loaded profile gear grinders are manned by our highly trained staff, providing consistency across the board. We’ve a dedicated helical gear design and development group, and our helical gears are stated in lean “Just with time” cells.

Diameter: 0.5” to 27.5”
Face: 12.9” Max
Pitch: 48 to at least one 1.7 DP
Quality: AGMA Tolerance Q15
Cut Helical Gears
We also have a wide selection of capabilities when it comes to cut helical gears. From high to low volume, small or large size, we can satisfy your requirements with this automated to manually loaded equipment hobbers or shapers. Our customers know they can switch to us for high quality cut helical gears. Our procedures are old, and we guarantee all of our products.


Diameter: 0.5” to 72.0”
Face: 24” Max
Pitch: 120 to 1 1.5 DP
Quality: AGMA Tolerance Q10

We are also capable of slicing select helical cut gears internal helical gears. Please e mail us with specifications for account.

Besides smoother movement, higher speed capacity, and less noise, another advantage that helical gears provide over spur gears may be the ability to be used with either parallel or non-parallel (crossed) shafts. Helical gears with parallel shafts need the same helix position, but reverse hands (i.e. right-handed teeth versus. left-handed teeth).

When crossed helical gears are used, they could be of either the same or opposing hands. If the gears have got the same hands, the sum of the helix angles should the same the angle between your shafts. The most typical exemplory case of this are crossed helical gears with perpendicular (i.e. 90 level) shafts. Both gears have the same hands, and the sum of their helix angles equals 90 degrees. For configurations with opposing hands, the difference between helix angles should the same the angle between the shafts. Crossed helical gears offer flexibility in design, but the contact between tooth is nearer to point contact than line contact, therefore they have lower pressure capabilities than parallel shaft styles.

Helical gears tend to be the default choice in applications that are ideal for spur gears but have nonparallel shafts. Also, they are utilized in applications that require high speeds or high loading. And whatever the load or speed, they generally provide smoother, quieter operation than spur gears.