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Glossary
Glossary
Balancing - A procedure by which the mass distribution of a
rotating body is checked, and corrected to insure smooth
operation.
Ball Yoke - See Tube Yoke.
Bearing Cross Hole - See Cross Hole.
Bearing Cup Assembly - Consists of a bearing up with needle
rollers generally held in place by a seal guard and bearing
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 Retainer - A heavy, formed metal cap used to retain a
bearing cup assembly in Quick Disconnect end yoke or flange
yoke designs.
Bearing Seal - A flexible member of a bearing cup assembly
which prevents the escape of lubricant from or entry of for-
eign matter into a bearing.
Bearing Strap - Stamped metal strap used to retain a bearing
cup assembly in a half-round end yoke or flange yoke design.
Boot - A flexible member which prevents the escape of lubri-
cant from or entry of foreign matter into the slip spline mem-
bers.
Boot Clamp - A thin adjustable band used to hold the boot in
position on the slip spline members.
Boot Seal - See Boot.
Center Bearing - Consists of a rolling element bearing iso-
lated in rubber and a bracket configuration for attachment to
the vehicle fram.
Companion Flange - A fixed flange member that attaches the
driveshaft assembly to another drivetrain component.
Coupling Shaft - The coupling member or members of a mul-
tiple-piece driveline which includes a center bearing.
Cross - See Journal Cross.
Cross Hole - A through hole in each lug ear of a yoke used to
locate a bearing cup assembly.
Deflector - See Slinger.
Driveline - An assembly of one or more coupling shafts and a
driveshaft with provisions for axial movement, which trans-
mits 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 con-
nected to a tubular shaft member which accomodates axial
movement.
Driveshaft Length (Center Line to Center Line or CL to CL) -
The distance between the outermost universal joint centers on
a driveshaft. On driveshafts with variable length centers, it is
usually measured in the compressed or installed lengths.
Ear - One of two projecting parts of a yoke symmetrically
located with respect to the yoke’s rotational axis.
End Fitting - An end yoke or companion flange (including
S.A.E>, DIN and T-Type styles) that attaches a driveshaft to
another drivetrain component.
End Yoke - A Quick Disconnect yoke that attaches a driveshaft
to another drivetrain component.
Flange Yoke - A full-round or Quick Disconnect style yoke
which attaches a driveshaft to a companion flange.
Glidecote - The blue, nylon, wear-resistant coating on Spicer
yoke shafts and tube shafts.
Grease Zerk
Fitting - The fitting on the shoulder or center of a
journal cross or on a relubable slip spline that allows for lubri-
cation.
Inboard Yokes - Yokes that make up the ends of a driveshaft
or coupling shaft assembly, i.e. tube yokes, slip yokes, yoke
shafts, and center bearing end yokes.
Installation Height Tools - Round, hard plastic disk that are
supplied with all Spicer Life Series replacement universal joint
kits to ensure proper bearing cup assembly installation speci-
fications.
Journal Cross - The core component of a universal joint
which is an intermediate drive member with four equally
spaced trunnions in the same plane.
Lug Ear - See Ear.
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