Helical gears are 1 type of cylindrical gears with slanted tooth trace. Compared to spur gears, they possess the larger get in touch with ratio and excel in quietness and less vibration and in a position to transmit large force. A couple of helical gears has the same helix angle however the helix hand is definitely opposite.

When the reference section of the gear is in the standard plane, by tilting the hobbing tool, the spur equipment hobbing machine and hobbing tool can be used to create helical gears. Due to the twist of teeth, their manufacturing gets the disadvantage of more difficult 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 guts distance is identical to spur gears provided that they are the same module and amount of teeth. This enables for easy swapping with spur gears. However, in this case, they require special hobbing cutters and grinding stones, resulting in higher production cost. However, if the reference section can be in the standard plane, you’ll be able to use spur gear hobbing tools and grinding stones. However, the same module and number of tooth in spur gears no longer match the center range of helical gears, and swapping turns into very hard. In addition, the guts distance is usually not an integer.

While spur gears usually do not generate axial thrust forces, because of 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. Nevertheless, combining right hands and left hand helical gears making dual helical gears will remove the thrust force.
Helical gears are often used in automotive transmissions by replacing spur gears.
Helical gears have teeth that are established on an angle to the gear axis. The features and benefits act like spur gears, but can be a better choice when higher velocities are helical cut gears needed. Compared to spur gears, helical gears have got better tooth strength and an increased load carrying capacity. There is also a smoother and quieter procedure because of 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 an array 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 gets the knowledge and experience 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 ground helical gears anywhere. Our robotically loaded threaded and profile steering wheel gear grinders function to meet up high volume needs. For smaller runs, our manually loaded profile equipment grinders are manned by our experienced staff, providing consistency over the board. We have a dedicated helical equipment 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 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 quantity, small or large size, we can meet your requirements with this automatic to manually loaded gear hobbers or shapers. Our clients know they can convert to us for high quality cut helical gears. Our processes are old, and we guarantee all of 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 cutting select internal helical gears. Please contact us with specifications for thought.

Besides smoother motion, higher speed ability, and less sound, another benefit that helical gears provide more than 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 angle, but opposite hands (i.electronic. right-handed teeth vs. left-handed teeth).

When crossed helical gears are used, they could be of either the same or opposite hands. If the gears possess the same hands, the sum of the helix angles should equivalent the angle between the shafts. The most typical example of this are crossed helical gears with perpendicular (i.e. 90 degree) shafts. Both gears possess the same hands, 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 the 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 capabilities than parallel shaft designs.

Helical gears tend to be the default choice in applications that are ideal for spur gears but have non-parallel shafts. Also, they are utilized in applications that want high speeds or high loading. And regardless of the load or velocity, they generally provide smoother, quieter operation than spur gears.