Helical gears are one kind of cylindrical gears with slanted tooth trace. In comparison to spur gears, they possess the larger get in touch with ratio and excel in quietness and much less vibration and in a position to transmit large drive. A set of helical gears has the same helix position but the helix hand is usually opposite.

When the reference portion of the apparatus is in the normal plane, by helical cut gears tilting the hobbing tool, the spur equipment 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 difficult production.

The helical gears created by Ever-power could be classified into two groups by the reference portion of the gears becoming in the rotating plane (transverse module) and normal plane (normal module). If the reference section is in the rotating plane, the guts distance is similar to spur gears as long as they will be the same module and number of teeth. This enables for easy swapping with spur gears. Nevertheless, in this case, they might need particular hobbing cutters and grinding stones, leading to higher production cost. However, if the reference section is definitely in the normal plane, it is possible to use spur equipment hobbing equipment and grinding stones. However, the same module and quantity of teeth in spur gears no more 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, due to the twist in the tooth trace, helical gears produce axial thrust force. As a result, 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 eliminate the thrust force.
Helical gears are often used in auto transmissions by replacing spur gears.
Helical gears have teeth that are arranged on an angle to the apparatus axis. The features and benefits act like spur gears, but could be a better option when higher velocities are required. In comparison to spur gears, helical gears possess higher tooth strength and a higher load carrying capacity. They also have a smoother and quieter operation because of their higher face contact ratio.

Ever-power is well equipped to meet up all of 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 amounts up to AGMA Q15. Whether you will need metric, diametral or other types of gears and splines, the team at Ever-power has the knowledge and experience to produce the high quality gearing you need.

Ground Helical Gears
Using our intensive experience and our selection 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 function to meet up high volume demands. For smaller runs, our manually loaded profile gear grinders are manned by our highly trained staff, providing consistency over the board. We’ve a dedicated helical equipment design and development team, 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 huge size, we can fulfill your requirements with this automatic to manually loaded equipment hobbers or shapers. Our customers know they can turn to us for top quality cut helical gears. Our processes are old, 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 capable of reducing select internal helical gears. Please contact us with specifications for consideration.

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

When crossed helical gears are used, they may be of possibly the same or reverse hands. If the gears have the same hands, the sum of the helix angles should equal the angle between your shafts. The most common example 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 your shafts. Crossed helical gears offer flexibility in design, but the contact between tooth is nearer to point get in touch with than line contact, therefore they have lower drive capabilities than parallel shaft styles.

Helical gears are often 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 regardless of the load or rate, they generally provide smoother, quieter operation than spur gears.