Differential Assembly Link Pinion Mounting
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Solution Overview
Problem
Existing differential assemblies for vehicles are complex and heavy due to the use of spiders to support pinion gears, which increases weight and reduces performance by increasing the mass moment of inertia, and often require additional fasteners and thrust washers for assembly.
Innovation Solution
A differential assembly design that eliminates the need for spiders by directly mounting pinion gears on links extending between flange members, reducing the number of parts and allowing for a more open design that enhances lubrication and simplifies assembly by eliminating fasteners and thrust washers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spiders are used to support pinion gears, then the differential assembly can be assembled, but the weight and mass moment of inertia increase
Solution Approach 1:
The patent removes the spider component entirely from the differential assembly. Instead of using spiders to support pinion gears, the design directly mounts pinion gears to the axles, extracting the unnecessary supporting structure that was adding weight and inertia while not providing adequate support functionality.
Solution Approach 2:
The patent combines the functions of the spider and the axle by directly mounting pinion gears to the axles. This merging eliminates the intermediate spider component, reducing the number of parts and the overall weight of the moving differential assembly while maintaining structural integrity.
2Reliability
If spiders and additional fasteners are used, then the pinion gears can be supported, but the device complexity increases
Solution Approach 1:
The patent extracts and removes the spider component and associated fasteners from the assembly. By eliminating these unnecessary parts, the design reduces device complexity while maintaining the essential function of supporting pinion gears through direct mounting to the axles.
Solution Approach 2:
The patent merges the support function into the existing axle structure, eliminating the need for separate spiders and fasteners. This consolidation reduces the number of parts and simplifies the overall device complexity while preserving the structural support needed for pinion gears.
3Strength
If a closed differential assembly design is used, then structural integrity is maintained, but lubrication access to gear surfaces is reduced
Solution Approach 1:
The patent segments the differential assembly design to create an open configuration that allows lubricant access. By opening up the structure rather than maintaining a fully closed design, the patent enables better lubrication flow to gear surfaces while maintaining sufficient structural integrity through the direct mounting arrangement.
Solution Approach 2:
The open design acts as an intermediary that facilitates lubricant flow between the lubrication system and gear surfaces. This mediator approach allows lubricant to reach critical gear contact areas more effectively, enhancing gear durability without compromising the overall structural integrity of the differential assembly.
Data Source
AI summary
A differential assembly having a link that may extend from a first flange member to a second flange member. A pinion gear may be rotatably disposed on a pin that may be provided with the link.