Rotating Shaft In Situ Differential Gear Lubrication
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Solution Overview
Problem
Differential gear systems with non-fixed rotating shafts pose challenges in lubrication as the grease is squeezed out and lubrication properties degrade over time, requiring periodic lubrication, but existing methods either require disassembly, which is time-consuming and costly, or are inefficient due to moving parts not aligning with fixed lubrication tubes.
Innovation Solution
A method and apparatus that include a rotating member within a housing with a chamber to receive lubricant from outside and holes to disperse it to selected gear locations, allowing lubricant to be supplied internally through a shaft and distributed radially or via a trough/gutter using centrifugal force, ensuring alignment with gear mesh locations during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grease is supplied through a fixed tube or guide at a fixed location in the housing, then lubrication is simple to implement, but the lubrication is ineffective because the tube or guide does not align with the gear mesh location as the shaft rotates
Solution Approach 1:
The patent applies the dynamics principle by making the lubricant delivery system rotate with the shaft. The tube or guide is coupled to the rotating shaft so that it moves dynamically to maintain alignment with the gear mesh location throughout the rotation cycle, ensuring continuous effective lubrication delivery.
Solution Approach 2:
The patent applies the nesting principle by placing the lubricant delivery tube inside the rotating shaft. The tube is nested within the shaft structure and rotates together with it, allowing the lubrication system to be compact while maintaining dynamic alignment with the gear mesh location.
2Reliability
If the gearbox is disassembled to re-grease the gears, then complete lubrication coverage is achieved, but the maintenance process becomes time consuming, expensive and risky
Solution Approach 1:
The patent applies the extraction principle by removing only the necessary component (the lubricant delivery tube or guide) from the shaft for maintenance, rather than disassembling the entire gearbox. This allows the tube to be replaced or refilled while the shaft and gearbox remain assembled, significantly reducing maintenance time and risk.
Solution Approach 2:
The patent applies segmentation by designing the lubrication system as a separate, accessible component (the tube or guide) that can be independently maintained. The tube is positioned to extend through or beyond the shaft, allowing it to be serviced separately from the shaft and gearbox assembly.
3Reliability
If a dynamic tube or guide is used that rotates with the shaft, then lubrication alignment is maintained, but the device complexity increases
Solution Approach 1:
The patent applies the universality principle by designing the rotating tube or guide to serve multiple functions: it acts as both a structural component of the lubrication system and a dynamic alignment mechanism. The same component that delivers lubricant also provides the rotational coupling to the shaft, eliminating the need for separate alignment mechanisms.
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
Enables in-situ lubrication of differential gear systems without disassembly, reducing maintenance time and cost, minimizing damage risk, and eliminating the need for re-rigging, thus reducing vehicle downtime and ensuring consistent lubrication delivery to moving gear components.
Implementation Method 1
a chamber within the member configured to receive a lubricant from an exterior of the housing
Implementation Method 2
a hole in the member configured to disperse the lubricant from the chamber to a selected gear location of the gear
Data Source
AI summary
A method and apparatus for lubricating a gear of a differential gear system is disclosed. A member or shaft rotates within a housing of the differential gear system. The shaft includes a chamber for receiving a lubricant from the exterior of the housing. A gear rotates relative to the shaft, and a hole in the shaft disperses the lubricant from the chamber to a selected gear location of the gear to lubricate the gear.