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Directions for Assembly
Universal Joints and Drive Shafts Single
or Do
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The single joints transfer the initiated
uniform motion non-uniformly, because in one revolution of the driving
shaft the driven shaft is accelerated twice and slowed down twice.
The size of the cyclic irregularity depends on the working angle ß.
To keep the motion uniform, two single joints (or one drive shaft)
or one double universal joint must be used. If minor irregularities
in rotation are acceptable or the working angles are only small, just
one joint may also be used.
The working angle ß must be equal at each end of the intermediate
shaft for uniform transmission of motion.
Improperly assembled drive shafts reinforce the irregularities of
the rotary motion instead of compensating for them. This may destroy
the joint bearings and splines. For this reason, the marks on the
splined shaft and the socket must be in line when assembling the two
halves of the drive shaft.
It is also important for the bearings to be installed as close as
possible to the drive shafts.
Proper lubrication of drive shafts in friction bearings is essential
for sustained operation. If drip-feed lubrication is not possible,
the joints should be greased once a day. The joint may also be covered
with a GN 808.1 protective boot which is filled with oil or grease.
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