Inter-Axle Differential Case With Fastener-Free Spider Retention
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Solution Overview
Problem
Existing inter-axle differential (IAD) assemblies require additional hardware such as fasteners, clips, rings, or rivets to secure the spider to the case, which increases cost, weight, and assembly time.
Innovation Solution
The IAD assembly integrates protrusions on the case that match indents on the spider legs, allowing for secure positioning without additional fasteners. These protrusions are formed by deforming the case material, such as through punching, to create a secure fit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional hardware such as fasteners, clips, rings, or rivets is used to couple the spider to the case, then the spider is securely attached to the case, but the cost and weight of the IAD assembly increase
Solution Approach 1:
The case and spider are merged into a single integrated component where the spider legs are formed as integral extensions of the case structure. This eliminates the need for separate fasteners, clips, rings, or rivets, thereby reducing weight while maintaining secure attachment through the unified structural design.
Solution Approach 2:
The attachment hardware (fasteners, clips, rings, rivets) is extracted or removed from the design entirely. The spider and case are designed to work together as a unified structure, eliminating the need for additional coupling components and reducing overall assembly weight.
2Reliability
If additional hardware such as fasteners, clips, rings, or rivets is used to couple the spider to the case, then the spider is securely attached to the case, but the cost of the IAD assembly increases
Solution Approach 1:
The case and spider are merged into a single integrated component manufactured as one piece. This eliminates the need to purchase, inventory, and install multiple separate fastening hardware items, thereby reducing material costs and simplifying the manufacturing process.
Solution Approach 2:
All separate attachment hardware (fasteners, clips, rings, rivets) is extracted from the design. The integrated design requires fewer material purchases and reduces assembly labor costs, directly lowering the overall manufacturing cost of the IAD assembly.
3Reliability
If additional hardware such as fasteners, clips, rings, or rivets is used to couple the spider to the case, then the spider is securely attached to the case, but the assembly time increases
Solution Approach 1:
The case and spider are merged into a single integrated component that is manufactured as one piece. This eliminates the need for separate assembly steps involving fastening hardware, allowing the entire assembly to be produced in a single manufacturing operation, thereby reducing assembly time and increasing productivity.
Solution Approach 2:
All separate attachment hardware and the associated assembly operations are extracted from the manufacturing process. The integrated design allows for one-step manufacturing without the need to separately install fasteners, clips, rings, or rivets, significantly reducing assembly time.
4Weight of stationary object
If the case includes protrusions formed by punching to secure the spider, then additional hardware is eliminated reducing weight and cost, but the manufacturing process becomes more complex
Solution Approach 1:
The case design incorporates localized parameter changes through punched protrusions that create mechanical interlocking features. These protrusions are formed by punching operations that modify the case geometry to securely engage with the spider legs, achieving weight reduction while maintaining manufacturability through standard forming processes.
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
This solution eliminates the need for additional hardware, reducing the weight and cost of the IAD assembly while streamlining the assembly process, and ensures correct alignment and stability of the spider within the case.
Implementation Method 1
These protrusions are formed by deforming the case material, such as through punching, to create a secure fit.
Data Source
AI summary
Systems and methods are provided for an inter-axle differential assembly. The inter-axle differential assembly comprises a case and a spider disposed within the case which includes a plurality of outwardly extending leg which includes a indent positioned at a distal face. The case comprises a plurality of protrusions adapted to be positioned within the corresponding indents of the plurality of outwardly extending legs, the plurality of protrusions adapted to maintain a position of the case relative to the spider.