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About Helical Gear

Helical gears can transmit energy between parallel or perpendicular axes through the use of helical teeth. They are designed to distribute pressure gradually along the whole tooth. Because of their tooth inclination, helical gears run smoother and quieter than other gears and are able to carry heavy loads efficiently. Due to the gradient of the teeth and the pressure applied, these gears are subject to axial thrust. This can be remedied by the use of  thrust bearings and specialized lubricant.


High Precision Helical Bevel Gear
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Helical Bevel Gears Information

Helical bevel gears are available in two teeth configurations: left handed and right hand. 
Helical bevel gears transmit energy through two axial configurations: parallel and perpendicular.
In parallel-axis helical gears the two opposite-hand gears provide quiet operation and high load capacity. These helical gears must be of opposite hands.
In perpendicular-axis helical gears, also called skew gears, two same-hand gears transmit energy through a 90° angle. The limited tooth contact of this configuration constricts work load. This type of helical alignment is comprised of two same-hand gears.


Helical Bevel Gear Application


Power, velocity and torque

Power, velocity and torque consistency and output peaks of the gear drive so the gear meets mechanical requirements.



Inertia of the gear through acceleration and deceleration. Heavier gears can be harder to stop or reverse.



Precision requirement of gear, including gear pitch, shaft diameter, pressure angle and tooth layout. 



Gear lubrication requirements. Some gears require lubrication for smooth, temperate operation and this is especially true for helical gears.



Noise limitation. Commercial applications may value a smooth, quietly meshing gear. Helical gears offer quiet operation.



Vibration and shock resistance. Heavy machine loads or backlash, the deliberate surplus space in the circular pitch, may jostle gearing. 

The Materials Of Helical Bevel Gear


Gear composition is determined by application, including the gear’s service, rotation speed, accuracy and more.
Cast iron provides durability and ease of manufacture.Alloy steel provides superior durability and corrosion resistance. Minerals may be added to the alloy to further harden the gear.Cast steel provides easier fabrication, strong working loads and vibration resistance.

Carbon steels are inexpensive and strong, but are susceptible to corrosion.Aluminum is used when low gear inertia with some resiliency is required.Brass is inexpensive, easy to mold and corrosion resistant.Copper is easily shaped, conductive and corrosion resistant. The gear’s strength would increase if bronzed.

Plastic is inexpensive, corrosion resistant, quiet operationally and can overcome missing teeth or misalignment.Plastic is less robust than metal and is vulnerable to temperature changes and chemical corrosion.Acetal, delrin, nylon, and polycarbonate plastics are common.
Other material types like wood may be suitable for individual applications.


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