Truck & Off-Highway Engineering - April 2019 - 28

Developing for

DEFENSE

PRODUCT DEVELOPMENT FEATURE

Allison's x1100 crossdrive transmission
is unique to tracked
vehicles and is
specifically designed
for either military or
heavy-duty tracked
vehicles such as the
Abrams tank.
Engineered to military specs, Meritor's ProTec Series 50 beam axles have a
gross axle weight rating (GAWR) up to 30,000 lb (13,608 kg) per axle.

Tailored transmissions

28 April 2019

End users specify the conditions under which their
military vehicles will operate and Allison Transmission
tests to those conditions. "These range from extreme
weather conditions and temperatures to nuclear attacks," he said.

Electrifying drivetrains
Electrified drivetrain technology is an area where
Allison's commercial endeavors inform military product development, Pittard told TOHE. Allison
Transmission offers electric hybrid solutions, as well
as the ability for the transmission to convert engine
power not needed to drive the vehicle into electrical
power to operate computers, radars, and other auxiliary systems that require onboard electric vehicle
power (OBEVP).
"A unique consideration is the duty cycle of military
vehicles and how this differs from the commercial vehicles that can use electrified drivetrains today," he
said. "The bus, garbage truck and other commercial
vehicles that start and stop frequently are ideal for
electrified drivetrains, as they can [via regenerative
braking] recharge their batteries regularly."
Military vehicles tend to operate differently, because
they either drive continuously while "road-marching"
great distances or tend to be stationary for extended
periods with a need for their engines to be running to
power accessories. Pittard explained that neither of
those typical operating modes adequately recharge
their batteries. Also, many tracked military vehicles
operate outside of cities where charging stations are
not available.
According to Pittard, Allison is working with various
partners to develop electrified drivetrains for future
military vehicles.
TRUCK & OFF-HIGHWAY ENGINEERING

CLOCKWISE FROM TOP LEFT: MERITOR; ALLISON TRANSMISSION; ALLISON TRANSMISSION

Allison Transmission exhibited in late February at the International
Defense Exhibition and Conference in Abu Dhabi, showcasing its
3000- and 4000-series units as well as the 5290 MXR, a future innovation for tracked vehicles. Allison shared the message that it continues to evolve to meet the stringent demands of military fleets worldwide, working with OEMs to design, develop, manufacture and support transmissions for tough conditions.
Dana Pittard, Allison's VP of Defense Programs, who is also retired
from the U.S. Army in the grade of Major General (2-Star), discussed
with Truck & Off-Highway Engineering how the company tailors a
transmission specifically for fleets that are developing new wheeled
or tracked vehicles, and what is involved in the process.
"While Allison's cross-drive transmissions-unique to tracked vehicles-are specifically designed for either military or heavy-duty
tracked vehicles, they still reflect the cutting-edge and innovative
technology developed by Allison's commercial business," he said. "In
fact, one of [our] most significant advantages in the military vehicle
market is that Allison is the only tracked-vehicle transmission manufacturer who also can offer wheeled-vehicle transmissions."
The work, research and development Allison's engineers bring
from the commercial side of the business offers military vehicles
"cutting-edge features," performance and durability that is not available to strictly military transmission developers, according to Pittard.
The supplier adapts commercial products and technology to reflect
the different environment, conditions and stresses of military duty.
Engineers need to know how to package the transmission in a way
that eliminates problems for the power pack integrator and vehicle
manufacturer. "We do not want to be [just] transmission salesmen or
suppliers," he said. "Our technical team works closely with the rest of
the vehicle team to make the entire platform better."
Challenges arise when applying these technologies to military vehicles. Additional durability has to be engineered into the military
applications, and the vehicles also demand more electronic features
to power radios, computer systems, infrared lights, etc.
"These challenges were largely overcome by working closely with our
customers to understand requirements, then to develop innovative solutions to these challenges. Solutions range from more robust hardware to
software that allows safe operation in a military environment," he said.
The testing process for military vehicles is somewhat more rigorous than for CVs, and tracked-vehicle applications are more challenging than wheeled-vehicle applications, according to Pittard.



Truck & Off-Highway Engineering - April 2019

Table of Contents for the Digital Edition of Truck & Off-Highway Engineering - April 2019

Contents
Truck & Off-Highway Engineering - April 2019 - Intro
Truck & Off-Highway Engineering - April 2019 - Cover1
Truck & Off-Highway Engineering - April 2019 - Cover2
Truck & Off-Highway Engineering - April 2019 - 1
Truck & Off-Highway Engineering - April 2019 - Contents
Truck & Off-Highway Engineering - April 2019 - 3
Truck & Off-Highway Engineering - April 2019 - 4
Truck & Off-Highway Engineering - April 2019 - 5
Truck & Off-Highway Engineering - April 2019 - 6
Truck & Off-Highway Engineering - April 2019 - 7
Truck & Off-Highway Engineering - April 2019 - 8
Truck & Off-Highway Engineering - April 2019 - 9
Truck & Off-Highway Engineering - April 2019 - 10
Truck & Off-Highway Engineering - April 2019 - 11
Truck & Off-Highway Engineering - April 2019 - 12
Truck & Off-Highway Engineering - April 2019 - 13
Truck & Off-Highway Engineering - April 2019 - 14
Truck & Off-Highway Engineering - April 2019 - 15
Truck & Off-Highway Engineering - April 2019 - 16
Truck & Off-Highway Engineering - April 2019 - 17
Truck & Off-Highway Engineering - April 2019 - 18
Truck & Off-Highway Engineering - April 2019 - 19
Truck & Off-Highway Engineering - April 2019 - 20
Truck & Off-Highway Engineering - April 2019 - 21
Truck & Off-Highway Engineering - April 2019 - 22
Truck & Off-Highway Engineering - April 2019 - 23
Truck & Off-Highway Engineering - April 2019 - 24
Truck & Off-Highway Engineering - April 2019 - 25
Truck & Off-Highway Engineering - April 2019 - 26
Truck & Off-Highway Engineering - April 2019 - 27
Truck & Off-Highway Engineering - April 2019 - 28
Truck & Off-Highway Engineering - April 2019 - 29
Truck & Off-Highway Engineering - April 2019 - 30
Truck & Off-Highway Engineering - April 2019 - 31
Truck & Off-Highway Engineering - April 2019 - 32
Truck & Off-Highway Engineering - April 2019 - 33
Truck & Off-Highway Engineering - April 2019 - 34
Truck & Off-Highway Engineering - April 2019 - 35
Truck & Off-Highway Engineering - April 2019 - 36
Truck & Off-Highway Engineering - April 2019 - 37
Truck & Off-Highway Engineering - April 2019 - 38
Truck & Off-Highway Engineering - April 2019 - 39
Truck & Off-Highway Engineering - April 2019 - 40
Truck & Off-Highway Engineering - April 2019 - 41
Truck & Off-Highway Engineering - April 2019 - 42
Truck & Off-Highway Engineering - April 2019 - 43
Truck & Off-Highway Engineering - April 2019 - 44
Truck & Off-Highway Engineering - April 2019 - 45
Truck & Off-Highway Engineering - April 2019 - 46
Truck & Off-Highway Engineering - April 2019 - 47
Truck & Off-Highway Engineering - April 2019 - 48
Truck & Off-Highway Engineering - April 2019 - 49
Truck & Off-Highway Engineering - April 2019 - 50
Truck & Off-Highway Engineering - April 2019 - 51
Truck & Off-Highway Engineering - April 2019 - 52
Truck & Off-Highway Engineering - April 2019 - Cover3
Truck & Off-Highway Engineering - April 2019 - Cover4
https://www.nxtbook.com/smg/sae/21AVE09
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https://www.nxtbook.com/nxtbooks/sae/18TOFHP12
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https://www.nxtbook.com/nxtbooks/sae/ave_201810
https://www.nxtbook.com/nxtbooks/sae/18TOFHP09
https://www.nxtbook.com/nxtbooks/sae/18AUTP09
https://www.nxtbook.com/nxtbooks/sae/18MOMP09
https://www.nxtbook.com/nxtbooks/sae/18TOFHP08
https://www.nxtbook.com/nxtbooks/sae/18AUTP08
https://www.nxtbook.com/nxtbooks/sae/ave_201808
https://www.nxtbook.com/nxtbooks/sae/18AUTP06
https://www.nxtbook.com/nxtbooks/sae/18TOFHP06
https://www.nxtbook.com/nxtbooks/sae/18AUTP05
https://www.nxtbook.com/nxtbooks/sae/ave_201805
https://www.nxtbook.com/nxtbooks/sae/18TOFHP04
https://www.nxtbook.com/nxtbooks/sae/18AUTP04
https://www.nxtbook.com/nxtbooks/sae/18MOMP04
https://www.nxtbook.com/nxtbooks/sae/ave_201803
https://www.nxtbook.com/nxtbooks/sae/18AUTP03
https://www.nxtbook.com/nxtbooks/sae/18TOFHP02
https://www.nxtbook.com/nxtbooks/sae/18AUTP02
https://www.nxtbook.com/nxtbooks/sae/18AUTP01
https://www.nxtbook.com/nxtbooks/sae/17TOFHP12
https://www.nxtbook.com/nxtbooks/sae/17AUTP11_supp
https://www.nxtbook.com/nxtbooks/sae/17AUTP11
https://www.nxtbook.com/nxtbooks/sae/17AUTP10
https://www.nxtbook.com/nxtbooks/sae/17TOFHP10
https://www.nxtbook.com/nxtbooks/sae/17AUTP09
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https://www.nxtbook.com/nxtbooks/sae/17AUTP08
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https://www.nxtbook.com/nxtbooks/sae/17AUTP01
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