Solid Rod Differential Support Structure for Lubrication and Cost Reduction
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Solution Overview
Problem
Conventional support rings for pinion shafts in mechanical differentials require extensive machining to achieve the necessary dimensions, leading to increased manufacturing costs and reduced durability due to friction and heat generation during operation.
Innovation Solution
A support structure made from non-hollow rod material with recessed faces and strategically placed bores and windows to accommodate pinion shafts, allowing for reduced machining and improved lubrication pathways, thereby reducing manufacturing costs and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional hollow tube support rings are used, then material waste increases due to extensive machining required, but manufacturing cost and durability are improved
Solution Approach 1:
The invention changes the manufacturing approach from machining hollow tubes to forming solid rod material into ring shapes. This parameter change in the manufacturing process eliminates the need for extensive material removal, reducing material waste while maintaining structural integrity and controlling costs through efficient material utilization.
Solution Approach 2:
The support ring is designed with varying wall thicknesses at different locations, with thicker sections where strength is needed and thinner sections where material can be reduced. This local quality variation optimizes material distribution, reducing overall material usage while maintaining necessary structural properties.
2Loss of substance
If conventional hollow tube support rings are used, then material waste increases due to extensive machining required, but structural integrity is maintained
Solution Approach 1:
The invention changes the manufacturing approach from machining hollow tubes to forming solid rod material into ring shapes. This parameter change in the manufacturing process eliminates the need for extensive material removal, reducing material waste while maintaining structural integrity through controlled material distribution.
Solution Approach 2:
The support ring features non-uniform wall thickness with thicker sections at critical locations and thinner sections where strength requirements are lower. This local quality variation reduces overall material usage while preserving structural integrity where it is most needed.
3Ease of manufacture
If conventional support rings without windows are used, then manufacturing is simpler, but lubrication pathways are insufficient
Solution Approach 1:
The support ring is segmented with multiple windows distributed around its circumference, creating separate lubrication pathways that deliver lubricant to different pinion shafts. This segmentation improves lubrication efficiency and reliability while maintaining manufacturing simplicity through standardized window formation processes.
Solution Approach 2:
The windows in the support ring serve multiple functions: they provide lubrication pathways to pinion shafts, reduce the ring's rotational inertia, and potentially serve as alignment features. This multi-functionality improves lubrication efficiency without significantly complicating manufacturing.
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 reduces manufacturing costs and improves the durability of mechanical differentials by providing efficient lubrication pathways and minimizing material waste, while maintaining the structural integrity and functionality of the support ring.
Implementation Method 1
the differential assembly must guide lubricant to the various frictional surfaces to relieve friction and minimize the generation of heat
Implementation Method 2
During operation of the differential assembly, friction and heat are generated as components within the differential housing are engaging and contacting one another
Implementation Method 3
solid bars generally have to be substantially machined to create rings. As such, a large amount of material has to be machined to form a hollow support ring having the required dimensional characteristics
Data Source
AI summary
A support structure for a differential assembly comprising: a support ring having a peripheral wall extending between a first face and a second face, the support ring having a non-hollow center; a bore in the peripheral wall sized and shaped to receive a pinion shaft; and an aperture in the first face, the second aperture in fluid communication with the first aperture.