Helical gears are one kind of cylindrical gears with slanted tooth trace. In comparison to spur gears, they have the larger contact ratio and excel in quietness and much less vibration and able to transmit large drive. A pair of helical gears gets the same helix angle but the helix hand is 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 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 being in the rotating plane (transverse module) and normal plane (normal module). If the reference section is definitely in the rotating plane, the guts distance is similar to spur gears provided that they will be the same module and amount of teeth. This allows for easy swapping with spur gears. Nevertheless, in this case, they require special hobbing cutters and grinding stones, resulting in higher production cost. However, if the reference section is in the standard plane, you’ll be able to use spur gear hobbing tools and grinding stones. Nevertheless, the same module and amount of tooth in spur gears no longer 
match the center range of helical gears, and swapping becomes very difficult. 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. Therefore, it really is desirable to make use of thrust bearings to soak up this force. However, combining right hands and left hand helical gears making dual helical gears will eliminate the thrust force.
Helical gears are often used in automotive 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 can be a better option when higher velocities are required. In comparison to spur gears, helical gears have higher tooth strength and an increased 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 all your helical gear requirements, whether cut or accuracy 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 styles of gears and splines, the group at Ever-power has the knowledge and encounter to produce the top 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 floor helical gears anywhere. Our robotically loaded threaded and profile 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 have a dedicated helical equipment design and development group, and our helical gears are produced in lean “Just in Time” cells.
Capabilites
Diameter: 0.5” to 27.5”
Face: 12.9” Max
Pitch: 48 to at least one 1.7 DP
Quality: AGMA Tolerance Q15
Equipment
Cut Helical Gears
We also have a wide range of capabilities with regards to cut helical gears. From high to low volume, small or huge size, we can meet your requirements with our automated to manually loaded equipment hobbers or shapers. Our clients know they can turn to us for high quality cut helical gears. Our procedures are tried and true, and we guarantee all of our products.
Capabilities
External
Diameter: 0.5” to 72.0”
Face: 24” Max
Pitch: 120 to at least one 1.5 DP
Quality: AGMA Tolerance Q10
Internal
We are also with the capacity of reducing select internal helical gears. Please contact us with specifications for consideration.
Besides smoother movement, higher speed ability, and less sound, another advantage that helical gears provide more than spur gears is the ability to be helical cut gears utilized 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 can be of either the same or opposite hands. If the gears possess 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 possess the same hand, and the sum of their helix angles equals 90 degrees. For configurations with opposite hands, the difference between helix angles should equal the angle between the shafts. Crossed helical gears offer flexibility in design, but the contact between the teeth is closer to point contact than line contact, so they have lower push capabilities than parallel shaft designs.
Helical gears are often the default choice in applications that are ideal 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 generally provide smoother, quieter operation than spur gears.
