helical cut gears

Helical gears are one kind of cylindrical gears with slanted tooth trace. Compared to spur gears, they possess the larger contact ratio and excel in quietness and less vibration and in a position to transmit large push. A couple of helical gears gets the same helix position however the helix hand is usually opposite.

When the reference portion of the gear is in the normal plane, by tilting the hobbing tool, the spur equipment hobbing machine and hobbing tool can be used to produce helical gears. Due to 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 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 amount of teeth. This enables for easy swapping with spur gears. Nevertheless, in this case, they might need special hobbing cutters and grinding stones, leading to higher production cost. However, if the reference section can be in the normal plane, you’ll be able to use spur equipment hobbing equipment and grinding stones. Nevertheless, the same module and amount of the teeth in spur gears no longer match the center range of helical gears, and swapping becomes very difficult. In addition, the guts distance is usually no integer.

While spur gears do not generate axial thrust forces, due to the twist in the tooth trace, helical gears generate axial thrust force. Therefore, it 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 automotive transmissions by replacing spur gears.
Helical gears have teeth that are established on an angle to the apparatus axis. The features and benefits are similar to spur gears, but could be a better choice when higher velocities are required. Compared to spur gears, helical gears have got 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 needs, whether cut or precision ground. Our manufacturing capabilities 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 types of gears and splines, the team at Ever-power gets the knowledge and encounter to produce the high quality gearing you need.

Ground Helical Gears
Using our extensive experience and our selection of helical cut gears state-of-the-art equipment, we are able to manufacture the best quality ground 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 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 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 with regards to cut helical gears. From high to low volume, small or large size, we can satisfy your requirements with our automated to manually loaded gear hobbers or shapers. Our customers know they can convert to us for top 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 trimming select internal helical gears. Please e mail us with specifications for consideration.

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

When crossed helical gears are used, they can be of possibly the same or reverse 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 hands, and the sum of their helix angles equals 90 degrees. For configurations with opposing hands, the difference between helix angles should equivalent the angle between the shafts. Crossed helical gears provide flexibility in design, but the contact between teeth is closer to point contact than line contact, therefore they have lower force features than parallel shaft designs.

Helical gears tend to be the default choice in applications that are suitable for spur gears but have non-parallel shafts. They are also used in applications that want high speeds or high loading. And regardless of the load or swiftness, they often provide smoother, quieter operation than spur gears.


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