Transfer Case Lubricant Routing via Retainer Aperture Alignment
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Solution Overview
Problem
Passive lubricant fluid systems in transfer cases often result in insufficient lubricant delivery to clutch assemblies, leading to delays and potential damage due to fluid dispersion to unintended areas.
Innovation Solution
An active transfer case design with a passive lubricant fluid circuit and a retainer that aligns apertures to facilitate immediate lubricant fluid delivery to clutch plates when the clutch assembly is engaged, combined with a lubricant guide to direct fluid flow and prevent dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a passive lubricant fluid system is used to reduce complexity, then device complexity is reduced, but lubricant delivery timing and reliability deteriorate
Solution Approach 1:
The patent implements a lubricant reservoir positioned to pre-position lubricant near the clutch assembly before engagement. This preliminary positioning ensures that lubricant is immediately available when the clutch engages, eliminating delivery delays while maintaining a passive system architecture without complex pumps or controlled delivery mechanisms.
Solution Approach 2:
The patent introduces a lubricant reservoir as an intermediary component between the lubricant fluid system and the clutch assembly. This reservoir acts as a buffer that stores and delivers lubricant directly to the clutch plates, mediating the delivery process to ensure timely and reliable lubrication without requiring complex active control systems.
2Ease of operation
If lubricant fluid is allowed to circulate freely in a passive system, then ease of operation is improved, but lubricant dispersion to unintended areas increases
Solution Approach 1:
The patent employs directed flow paths and positioning features that concentrate lubricant delivery specifically at the clutch assembly location. The reservoir and associated flow channels are designed to deliver lubricant precisely where needed (local quality) rather than allowing free circulation throughout the entire transfer case, preventing dispersion to unintended areas while maintaining passive operation.
3Device complexity
If lubricant delivery is delayed in a passive system, then device complexity is reduced, but damage to clutch assembly increases
Solution Approach 1:
The lubricant reservoir is positioned and configured to pre-position lubricant in close proximity to the clutch assembly before engagement occurs. This preliminary action ensures that as soon as the clutch engages, lubricant is immediately available to protect the clutch plates, eliminating the delay that would otherwise lead to damage while keeping the system passive and simple.
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
Ensures timely and effective lubricant delivery to clutch plates, reducing the risk of damage and maintaining a consistent supply, thereby enhancing the reliability of the transfer case.
Implementation Method 1
the lubricant fluid system may be passive and may rely on splash of the lubricant fluid off of rotating internal parts to deliver the lubricant fluid to the targeted components
Implementation Method 2
The retainer may include at least one retainer aperture that aligns with the hub aperture of the clutch hub when the clutch assembly is engaged to permit a flow of the lubricant fluid from the clutch hub center to the clutch plates
Data Source
AI summary
An active transfer case for a motor vehicle may comprise a clutch assembly configured to rotatably couple a primary output shaft to an input sprocket when engaged. The clutch assembly may include a clutch pack having a plurality of clutch plates, and a clutch hub having a clutch hub center defined between an inner ring and an outer ring. The outer ring of the clutch hub may have a hub aperture placing the clutch hub center in fluid communication with the clutch plates. The active transfer case may further comprise a retainer slidingly inserted in the clutch hub center between the inner ring and the outer ring. The retainer may include a retainer aperture that aligns with the hub aperture of the clutch hub when the clutch assembly is engaged to permit a flow of a lubricant fluid from the clutch hub center to the clutch plates.