Axel Mount Mechanical Stop Leaf Spring Deflection
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Solution Overview
Problem
Leaf springs in heavy commercial vehicles are prone to failure due to excessive vertical deflection and buckling, which can lead to a rough ride and increased maintenance costs.
Innovation Solution
An axel mount with a mechanical stop and/or windup preventer is designed to reduce vertical deflection and prevent buckling by incorporating a housing, support, and mechanical stop, or a windup preventer that limits the flexibility of the leaf spring, thereby enhancing its durability and load-carrying capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the leaf spring is allowed to flex freely to provide suspension, then the cushioning effect is improved, but the vertical deflection becomes excessive causing failure
Solution Approach 1:
The patent introduces a mechanical stop that changes the deflection parameter of the leaf spring by limiting its vertical movement. The stop creates a physical barrier that prevents the spring from exceeding a predetermined deflection threshold, thereby controlling the parameter of vertical displacement while maintaining the spring's cushioning function within safe limits.
2Ease of operation
If the leaf spring is made more flexible to improve ride comfort, then the suspension performance is enhanced, but buckling occurs under load
Solution Approach 1:
The mechanical stop acts as an intermediary element between the leaf spring and the frame. It mediates the interaction by providing a controlled contact point that prevents excessive flexing and buckling while allowing the spring to maintain its flexibility for ride comfort. The stop serves as a middleman that limits the spring's movement without eliminating its suspension function.
3Weight of moving object
If the leaf spring thickness is reduced to lower vehicle weight, then fuel efficiency is improved, but the load-carrying capacity decreases
Solution Approach 1:
The mechanical stop performs a preliminary action by preventing the leaf spring from entering the buckling regime before it occurs. By establishing a physical limit on deflection in advance, the stop protects the reduced-thickness spring from experiencing the high stresses that would cause failure, thereby enabling the use of lighter springs without sacrificing load-carrying capacity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses shock and maintains a smoother ride while allowing vehicles to carry more weight without compromising steering or handling, reducing the likelihood of leaf spring failure and the need for maintenance associated with air suspension systems.
Implementation Method 1
The mechanical stop is coupled to the support and reduces an amount of vertical deflection allowed in an associated leaf spring
Implementation Method 2
The windup preventer coupled to the support and prevents a portion of the leaf spring from buckling
Implementation Method 3
The leaf spring is basically a slightly arced band that bends (e.g., straightens out) to provide a cushioning effect
Data Source
Figure 1
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Figure 3
AI summary
An axel mount (100) for a leaf spring comprises a housing (102), an aperture (104), a support (106), and a mechanical stop (108). The support (106) runs lengthwise on a shelf (112) of the housing (102) and has a length generally equal to a length of the housing (102). The mechanical stop (108) is coupled to the support (106) and reduces an amount of vertical deflection allowed to an associated leaf spring. Further, a windup preventer (530) may be coupled to the support (108) that prevents the leaf spring from entering a windup mode.