Oil Gel Capsule Overlay for Bearing Wear and Seizure Resistance
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Solution Overview
Problem
Bearing alloys used in vehicles suffer from wear and tear, leading to a decrease in seizure resistance characteristics, and existing overlay materials fail to maintain friction resistance and prevent aggregation after oil release.
Innovation Solution
The development of oil gel capsules, formed by mixing oil and a gelator with an aqueous surfactant solution, which are then coated onto bearing alloys to create an overlay layer that responds to temperature changes and prevents aggregation, improving friction and seizure resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyamideimide and lubricant are used as overlay material on bearing alloy, then wear resistance is improved, but seizure resistance characteristics decrease sharply after initial wear stage
Solution Approach 1:
The patent incorporates oil gel capsules into the overlay material before the bearing is put into service. These capsules are pre-positioned within the polyamideimide matrix, ready to release lubricant when needed. The capsules contain lubricant in a gel state that will melt and release oil under operating temperature conditions, providing preliminary protection against wear and seizure before the bearing experiences significant wear or failure
Solution Approach 2:
The patent utilizes temperature-dependent parameter changes of the oil gel capsules. The lubricant within the capsules is in a gel state at lower temperatures but melts and transitions to liquid state at operating temperatures, changing its flow properties and enabling it to migrate to wear surfaces. This parameter change allows the lubricant to remain contained during application but release automatically under service conditions, maintaining seizure resistance throughout the bearing's operational life
2Reliability
If liquid lubricant is released from microcapsule when plastic skin is physically damaged, then lubrication is provided, but damaged plastic skin aggregates and reduces engine efficiency
Solution Approach 1:
The patent employs oil gel capsules with flexible gel structures that can deform and adapt to mechanical stresses without fracturing into aggregating fragments. The gel matrix provides a flexible containment structure that allows controlled lubricant release through melting rather than through physical damage of a rigid shell. This eliminates the aggregation problem associated with damaged plastic skins while maintaining effective lubrication delivery
Solution Approach 2:
The patent utilizes the phase transition of the lubricant from gel state to liquid state as the primary release mechanism, rather than relying on physical damage of a containment shell. The lubricant is held in a gel state within the capsule at application temperature, then automatically releases when the temperature rises and causes the gel to melt. This phase transition-based release mechanism avoids the creation of damaged shell fragments that would aggregate and harm engine efficiency
3Reliability
If high viscosity lubricant composition is infiltrated into pores of sintered bearing, then lubrication is achieved, but application is limited by pore size and viscosity
Solution Approach 1:
The patent divides the lubricant delivery function into discrete oil gel capsules that are distributed throughout the overlay material matrix. Rather than attempting to infiltrate a continuous high-viscosity lubricant composition into the porous bearing structure, the lubricant is segmented into numerous small capsules that can be uniformly mixed into the polyamideimide overlay during manufacturing. This segmentation approach eliminates the infiltration difficulty while ensuring uniform lubricant distribution throughout the bearing surface
Solution Approach 2:
The patent creates a composite overlay material consisting of polyamideimide matrix embedded with oil gel capsules. This composite structure combines the wear resistance and structural integrity of the polyamideimide with the temperature-responsive lubricant delivery capability of the oil gel capsules. The capsules are dispersed throughout the composite material, providing lubrication at the wear surface without requiring infiltration into the bearing pores, thus avoiding the viscosity and pore size limitations
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 oil gel capsules maintain friction and seizure resistance characteristics even after oil release, preventing aggregation and extending the lifespan of bearing alloys by forming a lubricating film at worn sites, thus enhancing the performance and longevity of vehicle components.
Implementation Method 1
forming an oil gel by mixing an oil and a gelator
Implementation Method 2
mixing the oil gels and an aqueous surfactant solution
Implementation Method 3
forming a lubricating film at worn sites
Data Source
Figure 1
Figure 2A~2C
Figure 3(a)~3(b)
AI summary
An oil gel capsule includes an oil gel including an oil and a gelator, and at least one surfactant bonded to the oil gel. A contact part for a vehicle includes an overlay layer formed on a surface of the contact part, the overlay layer comprising oil gel capsules, wherein the oil gel capsules including an oil gel including an oil and a gelator, and at least one surfactant bonded to the oil gel.