Custom drive shaft assemblies enhance military vehicles
Belden Inc., Broadview, Ill., was recently contracted to supply a complete universal joint drive shaft assembly for a Mine Resistant Ambush Protected (MRAP) multi-role armored military vehicle. The drive shaft assembly was needed to connect the diesel engine and the compressor for the air conditioning unit in the vehicle.
The
end user originally specified a standard 32 mm OD needle bearing drive
shaft with stainless steel yokes and a quick release hub feature for
the initial testing phase. In 2007, the entire vehicle was placed into
a climate chamber to replicate environmental elements the armored
vehicle might encounter in various regions of the world. The tests
proved to be extremely demanding on the universal joint drive shaft,
resulting in premature failure.
Belden
then evaluated the application in the field. Company engineers
suspected that a combination of an undersized joint that couldn't
handle the torque and rpm of the diesel engine, plus the harsh
temperature and operating environment inside the vehicle’s engine
compartment, contributed to the drive shaft failure. Belden was further
challenged by the space limitations for a more robust joint. The
distance was very short and a telescoping feature was mandatory for the
assembly. The severe space constraints limited the possible bearing
size.
The
redesigned drive shafts now include a larger, heavy-duty bearing that
is sealed and equipped with a lubricant that can handle a greater range
of operating temperatures. The bearing seal was also improved to better
retain lubrication during longer periods of extreme operation.
Stainless steel yokes incorporate a custom profile and hub, as well as
the quick release feature.
The
selected needle bearing universal joints provide precise positioning,
operate continuously at high speeds, feature rigid axial stiffness for
push/pull loads, and can handle higher angles and rpm. The joint is
available in a variety of hub materials, including high-grade alloy
steel, grades of stainless steel, and an extruded aluminum for high
strength-to-weight ratios; specialty plating is available for
additional corrosion resistance. Boot covers are recommended in gaseous
and abrasive environments for added protection of the cross and
bearing. The joints are manufactured in both inch and metric sizes and
operating angles up to 45 degrees.
Visit Belden Inc. for more information.
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