Helical gears are one type of cylindrical gears with slanted tooth trace. Compared to spur gears, they have the larger get in touch with ratio and excel in quietness and much less vibration and able to transmit large power. A set of helical gears has the same helix angle however the helix hand is certainly opposite.

When the reference portion 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 the teeth, 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 portion of the gears getting in the rotating plane (transverse module) and normal plane (normal module). If the reference section is in the rotating plane, the center distance is identical to spur gears provided that they are the same module and number of teeth. This allows for easy swapping with spur gears. However, in this case, they might need particular hobbing cutters and grinding stones, leading to higher production cost. On the other hand, if the reference section is usually in the standard plane, you’ll be able to use spur gear hobbing tools and grinding stones. Nevertheless, the same module and number of tooth in spur gears no more match the center distance of helical gears, and swapping turns into very difficult. In addition, the center distance is usually not an integer.

While spur gears do not generate axial 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 hand and left hand helical gears making double helical gears will get rid of the thrust force.
Helical gears tend to be used in auto 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 could be a better option when higher velocities are needed. Compared to spur gears, helical gears have got greater tooth strength and an increased load carrying capacity. There is also a smoother and quieter operation due to their higher face get in touch with ratio.

Ever-power is well equipped to meet all your helical gear needs, whether cut or accuracy ground. Our manufacturing features include a wide variety 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 team 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 are able to manufacture the highest quality ground helical gears anywhere. Our robotically loaded threaded and profile wheel gear grinders work to meet up high volume helical cut gears demands. For smaller operates, our manually loaded profile equipment grinders are manned by our experienced staff, providing consistency across the board. We have a dedicated helical equipment design and development group, and our helical gears are stated 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 when it comes to cut helical gears. From high to low volume, small or huge size, we can meet your requirements with our automatic to manually loaded gear hobbers or shapers. Our customers know they can change to us for high quality cut helical gears. Our processes are tried and true, and we guarantee 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 with the capacity of slicing select internal helical gears. Please contact us with specifications for consideration.

Besides smoother motion, higher speed capability, and less noise, another advantage that helical gears provide more than spur gears is the ability to be used with either parallel or non-parallel (crossed) shafts. Helical gears with parallel shafts require the same helix position, but opposing hands (i.electronic. right-handed teeth vs. left-handed teeth).

When crossed helical gears are used, they may be of either the same or opposing hands. If the gears have the same hands, the sum of the helix angles should the same the angle between the shafts. The most common example 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 reverse hands, the difference between helix angles should equivalent the angle between your shafts. Crossed helical gears offer flexibility in design, however the contact between teeth is closer to point get in touch with than line contact, therefore they have lower drive capabilities than parallel shaft designs.

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