Glossary, Double reduction, Ctis – Spicer Drive Axles Application Guidelines User Manual
Page 95
AXAG-0200 June 2009 95
Glossary
Companion Flange
- Drive shaft side of the joint that
connects the drive shaft to the drive axle.
Compressible Inserts
- Foam inserts installed in the top
and bottom of the kingpin under the cap that reduce the
pressure / vacuum that is found in the bushing area during
typical service.
Connectors, ABS
- Sealed, corrosion-resistant plugs that
link the ABS wiring system to the Electronic Control Unit
(ECU), wheel speed sensors and modulator or relay valves
using a shielded wiring harness.
Control Algorithm
- The computer commands
programmed into the Electronic Control Unit (ECU) to
control brake actuation under impending wheel lock-up.
Controlled Traction Differential
- A differential
assembly that incorporates a friction plate assembly whose
purpose is to transfer torque from the slipping wheel to the
one with traction. This assembly consists of a multiple-
disc clutch that is designed to slip when a predetermined
torque value is reached.
Cracked Drum
- Brake drum cracked all the way through
by excessive heat build-up (perhaps signifying inadequate
drum weight, and/or driver abuse and/or resurfacing of a
drum beyond the manufacturer's limit). It could also be
caused by poor brake balance (See “
”)
Crack Pressure
- Minimum air pressure, expressed in
pounds per square inch (psi), required to open an air valve.
Cramp Angle
- Maximum turn of steering wheel in either
direction.
Creep Rating
- Extremely slow operation (<1.0 mi/hr)
typically applying to crane service.
Cross Link
- Composed of the adjustable cross tube and
threaded tie rod ends with ball sockets that connect the LH
knuckle tie rod arm to the RH knuckle tie rod arm.
Cross Tube
- Center tube portion of a cross link assembly
that is threaded with opposite threads on each end thereby
allowing adjustment by turning the tube with one hand.
CTIS
- Central Tire Inflation System- a means of easily
adjusting the vehicle tire pressure, both inflate and deflate,
for the conditions encountered whereby improving vehicle
mobility performance. CTIS is synonomus with military
off-road applications.
DAP (Double Anchor Pin)
- Brake system using two
pivot pins as opposed to just one for anchoring the brake
shoes.
Diagnostics, ABS
- A component-by-component self-
check performed each time the truck's ignition is turned
on. An independent microprocessor also checks the system
continuously during vehicle operation.
Diagonal System, ABS
- A brake system design that
divides the ABS into two circuits (front wheel on one side
with rear on the other side, and vice versa) to allow partial
system function should one diagonal malfunction.
Differential
- Rear axle gear assembly permitting one
and wheel to turn more slowly or faster than the other
when negotiating a turn
Differential Lock
- A mechanism that eliminates the
action of the differential so that both wheels can be driven
to improve tractive efforts on slippery surfaces. See
Driver-controlled Differential Lock
”.
Digital Processing, ABS
- The latest processing
technology that is many times faster and more reliable
than analog processing.
Disc Brake
- A foundation brake system consisting of a
flat disc or rotor on either side of which are friction pads.
Equal and opposite forces are applied to these pads to
press their working surfaces into contact with the braking
path of the rotor.
Dolly
- Two-wheel trailer equipped with drawbar and the
lower portion of a fifth wheel and other components
necessary to permit a
operate a full trailer; sometimes called a "PUP."
Double Anchor Pin
- See "
".
Double Diaphragm Air Chamber
- Generates force
output by utilizing two separate diaphragms, one in the
service chamber, and the other inside the spring chamber.
Double diaphragm brake chambers are the most common
in North America for general truck/
applications. (See “
Spring Brake
”)
Double Drop
- Beam having a drop in the center between
the spring mounting pads as well as the drop from the KPI
to the spring mounting pads.
Double Reduction Axle
- Dual gear reduction generally
used in rear axles.
Draglink
- Connection between the pitman arm and the
steer ball on the steer arm. Acts as a pull-and-push rod to
convey steering movements from the chassis-mounted
steering box to the spring-mounted axle.