Freewheel Lubrication Barrier With Variable Opening for Heat Control
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Solution Overview
Problem
Existing freewheel lubrication systems face challenges in maintaining effective lubrication during both engaged and disengaged operating modes, with current methods either failing to immerse contact zones adequately during engagement or causing heating issues due to bubbling during disengagement.
Innovation Solution
A freewheel with a lubrication barrier featuring a variable opening mechanism, where the opening area adjusts based on the position of the cage relative to the driving part, allowing for optimal lubrication during engagement and efficient fluid evacuation during disengagement, ensuring consistent lubrication and cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact areas are immersed in an oil bath during engaged operation, then wear on the freewheel is limited, but during disengaged operation the oil generates heat through a splashing effect
Solution Approach 1:
The barrier is designed to be movable relative to the driving part, changing its position between engaged and disengaged operating modes. During engaged mode, the barrier closes to immerse contact areas in lubricating fluid for wear protection. During disengaged mode, the barrier opens to allow oil evacuation and prevent splashing-induced heating. This dynamic reconfiguration resolves the contradiction between wear protection and heat generation.
Solution Approach 2:
The system changes the parameter of lubricating fluid volume in the connecting space based on operating mode. During engaged operation, the barrier closes to maintain high lubricant volume for adequate immersion of contact areas. During disengaged operation, the barrier opens to reduce lubricant volume and eliminate the oil bath, thereby preventing heat generation from splashing while maintaining lubrication when needed.
2Reliability
If a rim is used to delimit a lubricant pool containing the rollers, then contact areas are immersed in oil during engaged operation, but the rim must be precisely sized to prevent splashing during disengaged operation
Solution Approach 1:
Instead of a fixed rim that requires precise sizing, the invention uses a movable barrier that actively opens during disengaged operation. This dynamic mechanism eliminates the need for precise rim dimensioning, as the barrier completely opens to allow unrestricted oil evacuation, simplifying the design while maintaining lubrication effectiveness during engaged mode.
3Reliability
If a barrier completely blocks fluidic communication to flood contact areas during engaged operation, then lubrication is improved, but fluid evacuation during disengaged operation becomes difficult
Solution Approach 1:
The barrier is designed with movable elements that change its blocking capability based on operating mode. During engaged operation, the barrier closes completely to flood contact areas with lubricating fluid for optimal lubrication coverage. During disengaged operation, the barrier opens to restore fluidic communication, enabling efficient oil evacuation. This dynamic behavior resolves the contradiction between lubrication coverage and fluid evacuation efficiency.
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 ensures thorough lubrication of freewheel components during engaged mode while preventing overheating by maximizing fluid evacuation during disengaged mode, thereby extending freewheel lifespan and performance.
Implementation Method 1
a lubricating fluid circulating during engaged operation to lubricate the contact areas
Implementation Method 2
This internal shaft then has at least one radial orifice to direct the oil between the driving and driven sections by centrifugal force
Implementation Method 3
The lubrication system then aims to dissipate heat to cool the freewheel
Data Source
Figure 1~2
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Figure 5~6
AI summary
The present invention relates to a freewheel (10) comprising a driving portion (20) and a driven portion (30) that are free to rotate about an axis of rotation (AX). The freewheel (10) comprises a cage (400) carrying at least one rolling element (40) arranged in a connecting space (50). The freewheel (10) has at least one lubrication device (80) conveying a lubricating fluid (85) into the connecting space (50). The freewheel (10) includes at least one barrier (70) with a variable opening, arranged radially between the driving portion (20) and the driven portion (30) and longitudinally against the connecting space (50). The opening is indexed to a relative position of the cage (400) and the driving portion (20).