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Glossary
Bearing Stub— A splined stub that is pressed into and welded
onto the tubing of a non-slip coupling shaft assembly.
Brinelling— Grooves worn into a cross and bearing kit trunnion
by the needle rollers due to insuffi cient lubrication, excessive load
or incorrect driveline angles.
Cardan Universal Joint— A mechanical device in which a cross
and bearing kit connects yokes of a driving and a driven shaft.
Cross— The cross-shaped "body" of a universal joint kit.
Cross and Bearing Kit— Cross-shaped body with swivel
bearings over each end that joins two driveline yokes in a Cardan
universal joint. Cross and bearing kits are sometimes referred to as
a "universal joint" or "universal joint kit."
End Yoke— A yoke mounted to an input or output transmission
shaft or axle shaft and secured by a nut and washer.
Galling— A transfer or displacement of metal. Galling can be
caused by lack of lubricant, incorrect lubrication or excessive loads.
Gear Effi ciency (e)— Ratio of power out of a gear set and the
power provided into that gear set.
Hinging-Loose Condition— Usually within a slip section, which
causes vibration through the driveline.
Needle Cup— A cross and bearing component kit that fi ts over
the trunnion and holds the needle rollers.
Needle Rollers— Cylindrical bearings positioned around the bore
of the needle cup that enable the bearing to rotate freely on the
trunnion.
Non-Slip Coupling Shaft Assembly— A driveline of fi xed length
consisting of a weld yoke, tubing, bearing stub, center bearing kit
and an end yoke with splined hole.
Operating Angle— The angle defi ned by the intersection of the
centerlines of two shafts connected by a universal joint.
Permalube Universal Joint— A permanently lubricated and
sealed universal joint that does not require regular lubrication.
Permalube Driveline— A driveline incorporating permanently
lubricated universal joints with a permanently lubricated and
sealed slip section. The entire assembly does not require regular
lubrication.
(16579)
Printed in USA
Phasing— Correct alignment between yokes at each end of a
driveline.
Round Bearing— A type of bearing cup used in cross and
bearing kits for Cardan universal joints.
Runout— A condition in which a component's radius dimensions
vary when the component is rotated. Excessive runout can
negatively affect driveline operation.
Slip Yoke— A driveline assembly component that allows for
driveline length changes by absorbing axial (backward-forward)
movement of the driveline caused by axle articulation.
Standard Slip Assembly— A driveline assembly consisting of a
slip yoke, spline plug, tubing and weld yoke.
Torsional Acceleration— Excessive rotation speed in an
individual section of the driveline. Usually due to incorrect phasing.
Trunnion— Ground surfaces of the universal joint crossover in
which the bearing cups fi t.
Universal Joint— A joint providing a fl exible coupling that allows
torque transmission and rotary motion from one shaft to another,
as well as angular changes in shaft alignment.
Welch Plug— A plate or cup used to seal the hole in the throat of
a slip yoke and retain grease in the spline area.
Weld Yoke— A type of permanent fi tting, welded to one or both
ends of a driveline, designed for a specifi c combination of tubing
and universal joint kit.
Wing Bearing— A type of bearing cup used in cross and bearing
kits for specifi c types of yokes in Cardan universal joints. The cup
has two fl anges through which drilled or threaded holes extend to
allow for cross and bearing kit mounting.
Copyright Meritor, Inc., 2021
17
Glossary
MM-96147 / Revised 03-21
Page 95
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