Banjo Beam Axle Coverpan Strengthening Protrusions
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Solution Overview
Problem
Conventional banjo-style axle assemblies experience stress transmission to the coverpan during loading, leading to a finite fatigue life due to inadequate stress distribution.
Innovation Solution
The axle assembly design incorporates a banjo beam with upper and lower beam members welded together, featuring central carrier portions with tubes and spring seats, and a coverpan with a weld flange and strengthening protrusions to enhance structural integrity and stress distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coverpan is welded to the banjo beam to close the rear aperture, then the housing structure is completed and sealed, but stress is transmitted to the coverpan during loading, resulting in finite fatigue life
Solution Approach 1:
The patent applies local quality by adding reinforcing protrusions at specific locations on the coverpan where stress concentration occurs. These protrusions are strategically positioned to provide localized strengthening without requiring a complete redesign of the entire coverpan structure, thus improving fatigue life while maintaining manufacturing efficiency.
Solution Approach 2:
The patent employs composite material principles by integrating the coverpan as an load-bearing component with the banjo beam structure. The coverpan is designed with reinforcing protrusions that create a composite structural system, allowing the coverpan to actively participate in load distribution rather than merely serving as a closure, thereby improving both strength and fatigue resistance.
2Strength
If the coverpan is designed as a simple closure component, then manufacturing is simple and cost-effective, but it cannot adequately distribute stress under load conditions
Solution Approach 1:
Rather than making the entire coverpan complex, the patent applies local quality by adding reinforcing protrusions only at critical stress areas. This approach enhances stress distribution capability while keeping the overall coverpan design simple and manufacturable, avoiding unnecessary complexity throughout the entire component.
Solution Approach 2:
The patent segments the coverpan structure by adding discrete reinforcing protrusions rather than creating a monolithic complex structure. These protrusions are separate, localized features that can be independently manufactured and positioned, simplifying the overall manufacturing process while improving stress distribution where needed.
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 enhanced design improves the fatigue life of the coverpan by effectively distributing stress and increasing structural strength, allowing for more reliable operation under load conditions.
Implementation Method 1
The weld flange is welded to the central carrier portion via a fillet weld to close a first aperture formed in the central carrier portion
Data Source
AI summary
An axle assembly with a banjo beam and a coverpan. The banjo beam has an upper and lower beam members that are welded together to define a central carrier portion and a pair of tubes. The upper beam member has a pair of upper spring seats that are disposed on opposite sides of the central carrier portion. The lower beam member has a pair of lower spring seats that are disposed on opposite sides of the central carrier portion. The coverpan includes a weld flange and a cover portion. The weld flange is welded to the central carrier portion via a fillet weld to close a first aperture formed in the central carrier portion. The cover portion includes a wall member into which a pair of strengthening protrusions are formed. The strengthening protrusions are disposed on opposite lateral sides of a centerline of the central carrier portion.