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Glossary
Glossary
Glossary
Alignment Bar A device (gauge) used to check yoke cross hole alignment.
Ball Yoke See Tube Yoke.
Bearing Cross Hole See Cross Hole.
Bearing Cup Assembly Consists of a bearing cup with needle rollers, generally held in place by a seal guard and bear-
ing seal. Sometimes the assembly includes a thrust washer.
Bearing Cup A cup-shaped member used as the bearing bore of a bearing cup assembly and for positioning
a thrust end of a cross trunnion.
Bearing Seal A flexible member of a bearing cup assembly that prevents the escape of grease from or entry
of foreign matter into a bearing.
Bearing Strap A narrow, stamped metal plate used to retain a bearing cup assembly in a half round end yoke
or flange yoke design.
Center Bearing Consists of a rolling element bearing isolated in rubber and a bracket configuration for attach-
ment to the vehicle frame.
Companion Flange A fixed flange member that attaches a driveshaft to another drivetrain component.
Coupling Shaft The coupling member or members of a multiple-piece driveline, which consists of a universal
joint, tube, center bearing, and a slip or fixed spline shaft.
Coupling Shaft Length
(Centerline to Centerline)
The distance between the outermost universal joint centers on a driveshaft. On coupling shafts
with fixed centers, it is the nominal dimension.
Cross See Journal Cross.
Cross Hole A through hole in each lug ear of a yoke used to locate a bearing assembly.
Deflector See Slinger.
Driveline An assembly of one or more coupling shafts and a driveshaft with provisions for axial move-
ment, which transmits torque and/or rotary motion at a fixed or varying angular relationship
from one drivetrain component to another.
Driveshaft An assembly of one or two universal joints connected to a tubular shaft member, which
accommodates axial movement.
Driveshaft Length
(Centerline to Centerline)
The distance between the outermost universal joint centers on a driveshaft. On driveshafts with
variable length centers, driveshaft length is usually measured in the compressed or installed
lengths.
Ear One of two projecting parts of a yoke symmetrically located with respect to the rotation axis of
the yoke.
End Fitting An end yoke or companion flange (including SAE, DIN, and T-Type styles) that attaches a
driveshaft to another drivetrain component.
End Yoke A half round yoke that attaches a driveshaft to another drivetrain component.
Flange Yoke A full round or half round style yoke that attaches a driveshaft to a companion flange.
Flinger See Slinger.
Glidecote® The blue, nylon, wear-resistant coating on Spicer yoke shafts and tube shafts.
Grease Zerk (Nipple) Fitting The fitting on the shoulder or center of a journal cross or on a greaseable slip spline that allows
for lubrication.
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