Can I Modify My Leaf Springs for Increased Truck Payload Capacity?

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Discussion Overview

The discussion centers around modifying leaf springs on a truck to increase payload capacity. Participants explore the implications of adding or modifying leafs in semi-elliptical leaf spring designs, including design practices and considerations for maintaining structural integrity.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Exploratory

Main Points Raised

  • One participant inquires about the maximum considerations for modifying leaf springs to increase payload capacity, questioning whether simply adding leafs is sufficient or if design calculations are necessary.
  • Another participant notes that adding a leaf increases spring rate and emphasizes the importance of ensuring the main leaf can handle the maximum load, suggesting that typically only two or three additional leafs should be added to avoid jeopardizing the main leaf.
  • A participant expresses confusion about where to place the additional leaves, concerned about the potential impact on the triangular shape of the suspension and whether other leaves would need modification to maintain this shape.
  • Several participants request visual aids, such as photos or drawings, to better understand the triangular shape referenced in the discussion.
  • One participant recommends using an air lift air bag system as an alternative to modifying leaf springs, citing successful personal experience with the product.
  • A later reply suggests considering an overload leaf instead of adding leaves, proposing that this could prevent affecting the ride quality until heavy loads are carried.

Areas of Agreement / Disagreement

Participants express differing views on the best approach to modifying leaf springs, with some advocating for adding leaves and others suggesting alternative solutions like overload leaves or air bag systems. The discussion remains unresolved regarding the optimal method for increasing payload capacity.

Contextual Notes

Participants have not reached a consensus on the best practices for modifying leaf springs, and there are uncertainties regarding the structural implications of adding leaves and maintaining the suspension's shape.

AM1990
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Hi.
If I am going to increase pay load on a truck (within front and rear axle capacity). It is supposed to modify or add leafs in semi-elliptical leaf spring. I want to know what should be the max considerations for doing so?
Just adding some leafs in suspension can fulfill the requirement?
or there would be any design practice/calculation that should be followed?
 
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when you add a leaf you are adding spring rate, just make sure the main leaf can taker your max load..typically we add a spring leaf of length in between the current leafs and only add two or three leafs, more than that make jeaporidize the main leaf
 
Ranger Mike said:
when you add a leaf you are adding spring rate, just make sure the main leaf can taker your max load..typically we add a spring leaf of length in between the current leafs and only add two or three leafs, more than that make jeaporidize the main leaf

I am willing to add 2 leaves in total but I am confused where to put them. As it is obvious that a leaf suspension looks like triangular shape, so I am not sure its triangularity would be affected of not? If so then what would be the result? or shall I need to modify other leaves too to maintain its shape?
 
can you post a photo or drawing so we can see the " triangle"...
 
Ranger Mike said:
can you post a photo or drawing so we can see the " triangle"...
Ranger Mike said:
can you post a photo or drawing so we can see the " triangle"...
IMG_20151207_092206_424.jpg
IMG_20151207_092214_024.jpg
Might be these picture could help you also term "triangle" is just used for reference as it has a uniform shape that looks like a "triangle".
 
AM1990 said:
I am willing to add 2 leaves in total but I am confused where to put them. As it is obvious that a leaf suspension looks like triangular shape, so I am not sure its triangularity would be affected of not? If so then what would be the result? or shall I need to modify other leaves too to maintain its shape?
This is the reason it is a "triangle"
http://www.engineersedge.com/material_science/leaf-spring-design.htm

Instead of adding leaves, investigate adding an overload leaf, such as seen in the picture at the bottom.
http://www.torklift.com/index.php/blog/tags/listings/overload-leaf-springs?format=feed&type=rss
That way your ride is not affecting until you have the very heavy loads you wish to carry.
 

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