Adjustable Retainer Anchoring Bimetal Coil Fan Drive
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Solution Overview
Problem
Bimetal coil viscous fan drives face repeatability issues due to varying side loads and friction on the valve shafts, affecting the consistent engagement and disengagement of the cooling fan, which is critical for engine cooling.
Innovation Solution
An adjustable retainer member with UV-curable silicone is used to securely anchor the outer end of the bimetal coil, allowing for calibration and adjustment during and after production to ensure precise positioning and consistent operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bimetal coil is anchored using a fixed positioning method, then the structure is simple, but the engagement and disengagement repeatability is poor due to varying side loads and friction
Solution Approach 1:
The retainer member is made adjustable rather than fixed, allowing it to be repositioned along the housing to accommodate variations in side loads and friction. This dynamic positioning capability enables calibration of the bimetal coil's free end to achieve consistent engagement and disengagement repeatability despite varying operational conditions.
Solution Approach 2:
The invention allows changing the positional parameter of the retainer member along the housing. By adjusting the position of the retainer member, the free end of the bimetal coil can be calibrated to compensate for variations in side loads and friction, thereby improving engagement and disengagement repeatability.
2Adaptability or versatility
If the bimetal coil position is fixed during production, then the manufacturing process is simple, but calibration and adjustment after production is not possible
Solution Approach 1:
The retainer member is designed with adjustability, allowing it to be repositioned after production. This enables calibration of the bimetal coil's free end to achieve optimal engagement and disengagement characteristics, providing adaptability while maintaining relatively simple manufacturing processes.
Solution Approach 2:
The retainer member is pre-installed on the housing during production, but its adjustable nature allows for subsequent calibration. This preliminary installation provides a baseline structure that can later be fine-tuned without requiring complex re-manufacturing processes.
3Measurement precision
If the retainer member position is adjustable, then calibration and repeatability are improved, but the anchoring structure becomes more complex
Solution Approach 1:
The retainer member allows adjustment of its positional parameter along the housing, enabling precise calibration of the bimetal coil's free end. This positioning precision improves engagement and disengagement repeatability while the adjustment mechanism itself remains relatively simple.
Solution Approach 2:
The retainer member acts as an intermediary between the housing and the bimetal coil's free end. It provides a simple yet effective means of adjustment and calibration without requiring complex anchoring structures, achieving positioning precision through a straightforward mechanical interface.
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 enhances the repeatability and calibration of bimetal coil engagement and disengagement, addressing the inconsistency caused by side loads and friction, ensuring reliable fan drive operation across varying temperatures.
Implementation Method 1
The outer end of the bimetal coil member is anchored in place with a curable material, such as silicone
Data Source
AI summary
A system and method of anchoring a bimetal coil member on a viscous clutch fan drive. An adjustable channeled retainer member together with a silicone or silicone-type material is used to anchor the free end of the bimetal coil member.