Rear /Air Suspensions Flashcards
what are some key functions the rear suspension must perform
- Support the payload of the vehicle.
- Transmit acceleration and braking forces to the frame.
- Articulate tandem axles for all road conditions.
- Provide an acceptable ride both loaded and unloaded.
- Track properly to provide safe steering.
- Be easily serviced and maintained.
Main types of rear suspensions
- spring
- walking-beam
- air
what do suspension springs refer to
multileaf or taper leaf
What type of rear spring suspensions does PB use?
Slipper type ends
-forces spring contact to move to middle when loaded
what ratings does PB offer in walking-beam suspensions
35k to >65k pounds
how are walking beam suspensions connected
2 beams - 1 on each side of vehicle are connected to forward and rear drive axles
how many points of contact do walking beam suspensions use
They use 4-point frame mounting
Where are walking beam suspensions used?
reliable and perform well in heavy-duty on/off hwy vocational applications, but do not ride as well as air suspension
on which applications is PB low air leaf available?
as a tandem suspension application on Class 8 and single or tandem Class 7 vehicle
Capacity of PB low air leaf
tandem capacity of 40k lbs, Max GCW of 143k pounds
What carries most load on low air leaf
Air bags mounted to the leaf springs on each side of each axle carry most of the load
What is low air leaf designed for
for use with “high cube” general freight trailers or for auto carriers or flat beds, which require a low frame or fifth wheel height
What is low air leaf ride height
ride height of 19.5-inches, which is approximately 2.5-inches lower than standard
How much lower is low-low air leaf compared to low air leaf?
low-low is 2 inches shorter
Capacity of flex air system and air leaf with tracking rods
Rated capacity of 38k lbs, max GCW of 143k pounds
which suspension is PB lightest
Flex Air
Who is flex-air perfect for
Flex-Air is perfect for on-highway customers who need
the stability of lower ride height for high cube van
trailers
What is air leaf with tracking rods ideal for
very effective for all on-highway freight services. The overall durability of its design also allows it to be used in some on/off-highway applications, such as semi end-dump tractors
Which air suspension is designed for heavy duty on or off highway applications?
Air Trac
What is difference in Air Trac vs. Air Leaf w/tracking rods?
Air trac adds longitudinal tracking rods to transmit acceleration and braking to the frame
What are air trac suspensions best designed for?
Severe off-highway applications such as logging, refuse, dump, and low bed
What capacities are available with Air Trac?
The Air Trac is available in both single and tandem drive axle configurations.
Single drive application is available in 20,000- and 23,000-pound capacities
tandem drive applications in 40,000-, 44,000-, and 46,000-pound capacities.
Standard axle spacing for the dual drive Air Trac is
52-inches. Optional axle spacings of 54, 60, 65, and 72-inches are also available.
The Air Trac has a maximum GCW rating of 125,000 pounds for single axles
180,000 pounds for tandems
what does height control valve do
lets air in or out of suspension based on varying loads
