Radial Shaft Pin Locking Differential Assembly
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Solution Overview
Problem
Existing all-terrain vehicle differentials are bulky and heavy, limiting their ability to efficiently deliver power over harsh terrain and environmental conditions, and require complex assembly processes.
Innovation Solution
A mechanical locking differential with a drive ring rotating about a transverse axis, using radially extending shaft pins instead of axially extending bolts for attachment, resulting in a smaller, lighter design that simplifies assembly and disassembly while maintaining effective power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If traditional axially extending bolts are used to attach the drive ring, then the differential can be assembled, but the differential becomes bulky and heavy
Solution Approach 1:
The patent inverts the traditional bolt attachment approach by using radially extending shaft pins instead of axially extending bolts. This inversion allows the drive ring to be attached to the housing in a manner that reduces both weight and complexity, as the shaft pins integrate more efficiently with the housing structure and eliminate the need for complex axial fastening mechanisms.
Solution Approach 2:
The patent changes the attachment parameter from axial bolts to radial shaft pins. This parameter change fundamentally alters how the drive ring connects to the housing, enabling a more compact and lighter design while simplifying the assembly process through more straightforward radial insertion and securing methods.
2Power
If the differential is made smaller and lighter, then power delivery efficiency improves, but the structural integrity and power transmission capability may be compromised
Solution Approach 1:
The patent employs composite construction techniques in the housing and drive ring assembly, combining different materials and structural approaches to achieve high strength-to-weight ratio. The housing integrates the drive ring mounting features directly into its structure, creating a composite assembly that maintains structural integrity while minimizing weight and maximizing power delivery efficiency.
Solution Approach 2:
The differential is segmented into modular components (housing, drive ring, shaft pins) that can be optimized independently for strength and weight. This segmentation allows each component to be designed with specific material properties and geometries that maximize power delivery while maintaining necessary structural integrity through optimized local features.
Data Source
AI summary
A mechanical locking differential includes a driving ring in a differential housing between right and left active components. The driving ring is in line with the input bevel gear. The differential housing has a thin wall in a single, integral shell around the driving ring. Several hollow cylindrical shaft pins are used to attached the driving ring to the differential housing, with the shaft pins being driven radially relative to the transverse axis of the differential outputs in an interference fit with the housing and the driving ring. The shaft pins are held from axially backing out by two small rivets. The shaft pins preferably have a threaded inner diameter which assists in removal. The shaft pin attachment allows the bevel gear to extend closer to the transverse axis without obstruction.