Rear Differential Design: The Cause of Washboard Roads?

In summary, the conversation discusses the cause of washboard roads, specifically in the context of mountainous areas and logging trucks. Theories include the design of the rear differential, suspension systems, and the effect of heavy vehicles on compressible road surfaces. Factors such as vehicle speed, weight, and road composition are also noted as potential influences.
  • #1
zedex
5
0
After going up in the mountains where i live i started getting annoyed at how washboard the roads were. Logging trucks go up this road alot.
Is the design of the rear differential to blame for washboard roads? Seems to me to be the case since the bumps are evenly spaced.
Cheers :smile:
 
Physics news on Phys.org
  • #2
I would be more likely to believe that suspension systems are to blame. Others may know more.
 
  • #3
zedex,

I noticed this washboard effect once in northerrn Illinois where there are absolutely no hills. It occurs on roads that are basically dirt with just an oily tar coating, that is the surface is not very stable. It also occurs only at intersections (before the road crosses the other road). My theory was that it's caused by the constant breaking, which pushes forward on the road as cars come to a stop. The effect on other parts of the road where cars aren't accelerating as much or as often would be far less.

In the mountains just going up and down hills requires a lot of force being applied to roads, and with big trucks, even more force.

Anyway that's my guess.
 
  • #4
I agree with Integral. A standard vehicle has 2 primary suspensions; front and rear. Load forces are placed via the wheels on roads, and a moving vehicle generally has asymmetric loading on suspension, usually(though not always) with the greater load on the rear. Compressible road surfaces are affected under these circumstances. "Washboarding" results.
Factors including vehicle speed, total gross vehicle weight, axil loading differentials, axil spacing, road composition and traffic throughput have influence.
A heavily traveled compressible road surface often has more tightly space "washboards" due to the collective effects noted above.
 
  • #5
excellent. Makes sence. Thanks guys.
 

1. What is a rear differential and how does it relate to washboard roads?

A rear differential is a mechanical component in a vehicle that transfers power from the engine to the wheels. It is responsible for allowing the wheels to rotate at different speeds while the vehicle is turning. In the case of washboard roads, the design of the rear differential can contribute to the formation of the bumps and ridges on the road surface.

2. How does the design of a rear differential affect the formation of washboard roads?

The design of a rear differential can affect the formation of washboard roads in a few ways. One factor is the number and placement of spider gears, which are responsible for distributing power to the wheels. A higher number of spider gears can create a more even distribution of power, reducing the likelihood of washboard roads. Additionally, the angle and positioning of the gears can also impact the formation of washboard roads.

3. Are there specific types of rear differentials that are more prone to causing washboard roads?

Yes, some types of rear differentials are more likely to cause washboard roads than others. For example, open differentials, which have only one spider gear, are more prone to causing washboard roads due to their uneven distribution of power to the wheels. Limited-slip differentials, which have additional friction plates, can help reduce the formation of washboard roads.

4. Can the design of a rear differential be modified to prevent the formation of washboard roads?

Yes, the design of a rear differential can be modified to help prevent the formation of washboard roads. As mentioned before, using a limited-slip differential can help reduce the likelihood of washboard roads. Additionally, adjusting the placement and angle of the gears can also have an impact on the road surface. However, there is no one-size-fits-all solution, as the design of the rear differential must also be balanced with other factors such as fuel efficiency and handling.

5. Are there any other factors besides rear differential design that contribute to the formation of washboard roads?

Yes, there are other factors that can contribute to the formation of washboard roads. Some of these include the type and condition of the road surface, the weight and speed of the vehicles traveling on the road, and the frequency of traffic. Weather conditions, such as heavy rain or snow, can also affect the formation of washboard roads. Therefore, it is important to consider all of these factors when trying to prevent or repair washboard roads.

Similar threads

  • Other Physics Topics
Replies
5
Views
1K
  • Other Physics Topics
Replies
7
Views
2K
  • Introductory Physics Homework Help
Replies
6
Views
719
  • Sci-Fi Writing and World Building
Replies
24
Views
636
  • Differential Equations
Replies
1
Views
704
  • Other Physics Topics
Replies
1
Views
3K
Replies
26
Views
7K
  • Introductory Physics Homework Help
Replies
1
Views
205
Replies
81
Views
4K
  • Sci-Fi Writing and World Building
2
Replies
52
Views
4K
Back
Top