Meritor MM-96147, Maintenance Manual, Page: 95 / 100

Copyright Meritor, Inc., 2021
MM-96147 / Revised 03-21
Page 95
(16579)
Printed in USA
17 Glossary
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.
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.