Tech Briefs Magazine - December 2021 - MD-10

measured in gear tooth backlash. Bevel
gears, particularly spiral bevel gears,
can be made in sets to be very accurate,
down to about 6 arc mintues backlash.
Most worm and worm wheel gearing,
however, have far more backlash in
the gear tooth mesh, making them unsuitable
for many applications beyond
power transmission.
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Hypoid gears can achieve backlash
specifications as low as 3 arc minutes,
making them far more accurate than either
bevel or worm gear arrangements.
This level of precision, combined with
the many other established advantages,
has allowed hypoid gearing to go beyond
power transmission and to penetrate
the motion control market.
Hypoid Gears Have the Largest
Range of Uses
Hypoid gears are now commonly used
across a wide spectrum of automation
and motion control applications. Their
performance characteristics make them
ideal for both low- and high-speed applications
as well as high-cycle-rate applications
that require extreme precision.
Available in single- and two-stage arrangements,
packaged with a planetary
gear stage, hypoid gearboxes offer a wide
range of ratios from 3:1 up to 100:1.
Precision planetary gearboxes have
been present in the motion control
industry for many years. In order to
convert an inline planetary arrangement
into a right-angle reducer, gearbox manufacturers
incorporated a set of spiral
bevel gears to make the 90-degree turn.
In the past several years, these bevel gear
sets inside multi-stage, right-angle planetary
gearboxes are being replaced with
hypoid gears, resulting in more compact,
efficient, and precise gearboxes.
Most manufacturers have designed
motor flanges on the input of these
hypoid gearboxes to allow for a variety
of motors, including metric and NEMA
servo motors, to mount directly to the
gearbox housing. Whether used in a
single-stage right-angle gearbox or in
conjuction with planetary stages, hypoid
gears have a growing presence in the
motion control industry.
Hypoids Are the Gears
of the Future
It is unlikey Ernest Wildhaber could
have anticipated that his invention
would travel well beyond vehicle drivetrains
and into the world of industrial
power transmission and motion control.
Upon reviewing the design characteristics
of hypoid gears, it is easy to see why
this technology has experienced such
significant growth.
Compact, high speed, high torque,
high efficiency, extreme precision, low
noise, low heat, and long life - these
performance characteristics are synonymous
with hypoid gears and gearboxes.
The combination of these traits has
made hypoid gearing an increasingly
popular speed reduction solution for the
growing demands of today's power transmission
and motion control industries.
This article was contributed by Candy
Controls, Niles, IL. For more information,
visit http://info.hotims.com/79420-282.
10
Free Info at http://info.hotims.com/79420-723
Motion Design, December 2021
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ToC
11/17/21 3:39 PM
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Tech Briefs Magazine - December 2021

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