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Proper Assembly of Bevel Gears: 2 Important Factors to Know

October 17, 2018

While it is true that spur gears are easier to layout than bevel gears, these latter gears can be assembled in a way that can optimize their performance. A bevel gear is manufactured in various ways, such as spiral, straight, hypoid, or spiroid. All of these gears can be positioned optimally for the best performance under varying parameters. Two crucial criteria that will help ensure smooth and efficient bevel gears are the mounting distance and the backlash.


Our bevel gears at True Gear and Spline are perfect for your industrial applications!


Mounting Distance


This is a crucial factor to ensure optimal operation of bevel gears. It is the measure of distance between the bearing seat and the centerline of a mating gear. Given the dimensional variations between parts, each gear typically has its own unique mounting distance value. This is why manufacturers mark these values on each gear, which is also within the tolerance specified on the drawings.


From the nominal value of the mounting distance, the air for tolerance is at ±0.05mm. When the mounting distance value of the gear is less than the specified dimension, it may lead to tooth binding to one another and excessive wear. Similarly, if the value is greater than what is specified, the bevel gear will not be able to mesh properly, resulting in excessive backlash.




Backlash is understood as the space between each mating gear tooth, this is space is necessary in order to attain correct operation of bevel gears. It varies according to tooth size and the operating conditions. A definite amount of backlash should be achieved to properly assemble the gears. It is measured at the tightest point of the meshing teeth, unless specified otherwise. Same as the mounting distance, insufficient or excessive backlash may cause damage to the tooth due to shock load or sudden impulse and noise. It can be changed by also changing the position of the gears.


At True Gear and Spline, we dedicate ourselves to providing the best gear solutions for all of your industrial applications. Our team is highly capable of accommodating any unique requests for single gears and spline shafts. Call or email us today to learn more about our products and services!