Sintered Sliding Bearing Wear Resistance via Composite Matrix
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Solution Overview
Problem
Conventional sliding bearings experience excessive wear and reduced lubrication cycles under high-surface-pressure and high-temperature conditions due to inter-metal contact and frictional heat, leading to plastic deformation and abnormal wear of both the bearing and shaft.
Innovation Solution
A sintered sliding bearing composed of copper (7-20 wt%), tin (1-7 wt%), carbon (0.2-2.0 wt%), nickel (0.3-4 wt%), boron (0.01-0.4 wt%), and iron, with optional additives like chrome, molybdenum, vanadium, tungsten, manganese, and silicon, formed with air holes for lubricant impregnation, which maintains optimal friction characteristics and resistance to plastic deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If soft copper particles are dispersed on martensite to maintain bearing density, then the bearing can operate under normal conditions, but the bearing sticks to the shaft under high-surface-pressure and high-temperature conditions due to friction
Solution Approach 1:
The patent applies local quality by creating a dual-structure bearing where the matrix provides structural integrity while dispersed soft metal particles provide localized lubrication and anti-sticking properties. The soft particles are strategically distributed throughout the matrix to specifically address high-stress contact zones where sticking occurs.
Solution Approach 2:
The patent uses composite materials by combining a hard martensitic matrix with soft metal particles (copper, lead, or aluminum). This composite structure allows the bearing to simultaneously maintain structural strength under load and provide low-friction, anti-sticking surfaces through the soft particles that deform plastically to prevent adhesion.
2Loss of energy
If lubricant is impregnated to the bearing to reduce friction, then frictional resistance decreases, but the lubricant deteriorates under high-temperature and high-surface-pressure conditions, reducing the lubrication cycle
Solution Approach 1:
The patent implements self-service by designing the bearing to generate its own lubrication mechanism through the soft metal particles embedded in the matrix. These particles deform under pressure to create a self-renewing lubricating film that reduces friction without relying solely on external lubricant supply, thereby extending the effective lubrication cycle.
Solution Approach 2:
The patent applies parameter changes by modifying the physical and chemical properties of the bearing material through controlled deformation of soft particles under operating conditions. The particles undergo plastic deformation to change their shape and distribution, creating optimal lubrication parameters dynamically during operation rather than relying on static lubricant properties.
3Force
If the bearing operates under high-surface-pressure conditions, then load-bearing capacity increases, but plastic deformation of copper particles occurs, accelerating wear of the bearing
Solution Approach 1:
The patent applies preliminary action by pre-distributing soft metal particles throughout the bearing matrix before operation. These particles are positioned in advance to deform plastically under anticipated load conditions, creating a protective layer that prevents direct metal-to-metal contact and reduces wear before significant damage can occur.
Solution Approach 2:
The patent converts the harmful effect of soft copper particle deformation into a beneficial lubrication mechanism. The plastic deformation of particles under high pressure, which would normally accelerate wear, is instead utilized to create a self-lubricating surface that reduces friction and protects both the bearing and shaft from abnormal wear.
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 provides excellent wear resistance and extended lubrication cycles, maintaining low friction and high-surface-pressure performance without plastic deformation, enhancing load resistance and wear resistance for iron or steel shafts.
Implementation Method 1
reduce frictional resistance between the shafts and the shaft holes
Implementation Method 2
excellent wear resistance and extended lubrication cycles
Implementation Method 3
plastic deformation of the metal due to high-surface-pressure occurs
Implementation Method 4
high-temperature generated by friction
Data Source
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AI summary
The present invention relates to a sliding bearing with improved wear resistance which is manufactured in a sintered body type, and more particularly, to a bush type of sliding bearing that has excellent friction and wear characteristics with a shaft usually made of an iron-based material even under very poor sliding conditions of high-surface pressure, low speed, and irregularity, such that the lubrication cycle of may be extended, and also has excellent hardness such that load feed capability, plastic deformation suppression, and fatigue strength can be improved.