Wheel-End/Drivelines/Rear Axles Flashcards
What wheel mounting system is standard on PB trucks?
Hub-piloted (PHP-10) - close tolerances between wheel center and machined surface on hub.
Which axles have an oil seal sight glass?
All non-driving axles on PB trucks
Key features of driveline
- strong enough for low-gear torque
- light and dynamically balanced to prevent noise/vibration
Type of joint used on driveline connections
Slip joint to allow movement with up/down motion of suspension
Where is the 1st slip joint
Output joint where shaft attaches to transmission
What do u-joints do
Allow for driveshaft to operate at different angles (e.g. sloped roads)
When is a midship bearing used?
What does it do?
- used on long wheelbase vehicles
- Intermediate bearing in case 2 or more driveshafts are required
What material does PB use for driveshafts?
Steel tubing
What is purpose of rear axle?
- Support the load
- Retain and position the wheels
- Act as a mounting surface for the suspension
- Provide support for the braking system
- Encase the differential gearing and axle shafts
- Provide power transfer to the ground
- Allow a differential action to each side during a turn
What is used to allow wheels to go different speeds in turns?
A differential is used
In standard rear axles - what are the 2 gears called?
- Pinion (input or driving gear)
- Ring gear (driven gear)
How is rear axle ratio calculated?
teeth on ring gear divided by # teeth on pinion gear
Which applications typically use a double reduction axle?
heavier duty w/ addt’l strength and torque
- dump
- mixer
- off-highway
What are 2 methods for double reduction?
- planetary gear (addt’l planetary set inside ring gear)
- hypoid-helical (ring gear on shaft that has helical drive gear)
How does 2-speed rear axle work?
low range - planetary gears act normal
high range - planetary locked
