Slide Bearing Temperature Control at the Lubrication Transition
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Solution Overview
Problem
Existing methods for designing slide bearings are highly approximate and fail to accurately account for the dynamic properties of lubricants and the varying conditions of slide bearings during prolonged operation, leading to inefficiencies and reliability issues.
Innovation Solution
A method to control the bearing modulus of slide bearings by determining the temperature dependence of the lubricant's dynamic viscosity and regulating the operating temperature to maintain the bearing modulus within a transitional range between mixed-film and hydrodynamic lubrication, thereby optimizing performance characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If existing theoretical methods for designing slide bearings are used with standard assumptions, then the design process is simplified, but the accuracy and reliability of bearing performance predictions deteriorate
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the bearing modulus through temperature control of the lubricant. By changing the temperature parameter, the viscosity and consequently the bearing modulus are modified, allowing the system to transition between mixed-film and hydrodynamic lubrication regimes. This resolves the contradiction by providing a simple control mechanism (temperature adjustment) that achieves reliable and accurate bearing performance prediction and operation.
Solution Approach 2:
The patent implements dynamics by transitioning from static design assumptions to dynamic operation control. The bearing modulus is no longer fixed but is dynamically adjusted during operation through temperature control, allowing the system to adapt to varying operating conditions and maintain optimal performance. This dynamic approach improves prediction accuracy while keeping the control mechanism simple.
2Loss of energy
If the bearing modulus is maintained in the transitional range between mixed-film and hydrodynamic lubrication, then friction losses and starting torque are reduced, but the control system complexity increases
Solution Approach 1:
The patent applies self-service by utilizing the natural temperature-viscosity relationship of the lubricant. The system leverages the inherent property that lubricant viscosity changes with temperature, allowing automatic adjustment of the bearing modulus without requiring complex external control systems. This reduces friction losses while maintaining simple control through natural physical phenomena.
Solution Approach 2:
The patent changes the temperature parameter to control the bearing modulus, transitioning between lubrication regimes to minimize friction losses. By using temperature as the control parameter, the system achieves energy efficiency without introducing complex control mechanisms, as temperature can be easily monitored and adjusted.
3Manufacturing precision
If complex cooling systems are implemented to maintain bearing temperature, then the bearing modulus can be precisely controlled, but the device complexity and cost increase
Solution Approach 1:
The patent extracts the essential function of temperature control from complex cooling systems and focuses on the critical parameter of bearing modulus control. By taking out only the necessary temperature adjustment capability and using it to control the bearing modulus in the transitional lubrication range, the system achieves precise control without the need for elaborate cooling infrastructure.
Solution Approach 2:
The patent uses parameter changes in temperature to achieve precise bearing modulus control. By monitoring and adjusting the temperature parameter, the system maintains the bearing modulus in the optimal transitional range, achieving manufacturing precision without requiring complex cooling systems.
4Reliability
If the bearing operates in hydrodynamic lubrication with high bearing modulus, then the lubrication layer reliably separates rotating parts, but the vibrational resistance to self-oscillations deteriorates
Solution Approach 1:
The patent applies dynamics by enabling the bearing to operate in the transitional lubrication range rather than fixed hydrodynamic lubrication. This dynamic operation allows the system to maintain reliable lubrication layer separation while preserving vibrational resistance to self-oscillations, resolving the contradiction between reliability and stability.
Solution Approach 2:
The patent changes the bearing modulus parameter to the transitional range between mixed-film and hydrodynamic lubrication. This parameter optimization simultaneously achieves reliable lubrication layer separation and maintains vibrational resistance, eliminating the need to choose between reliability and stability.
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
This method reduces friction losses and starting torque, expands the operational characteristics of the bearing, and simplifies the design by eliminating the need for complex cooling systems, while enhancing the reliability and service life of the slide bearing.
Implementation Method 1
A temperature dependence of the dynamic viscosity of a lubricant of the slide bearing is determined
Implementation Method 2
A mixed-film lubrication to hydrodynamic lubrication transition temperature of the slide bearing is determined
Data Source
AI summary
A method for regulating the physical properties of slide bearings during operation. The method controls the bearing modulus (Hersey number) s of a slide bearing and includes the steps of: (a) determining the temperature dependence of the dynamic viscosity of the bearing lubricant; (b) determining the mixed-film lubrication to hydrodynamic lubrication transition temperature of the bearing; (c) determining, on the basis of the temperature dependence of the dynamic viscosity of the lubricant, the temperature dependence of the bearing modulus λ(T) and the value of the bearing modulus λcr of the mixed-film lubrication to hydrodynamic lubrication transition of the bearing; (d) measuring the operating temperature of the bearing; (e) regulating the value of the operating temperature of the bearing in order to keep the operating value of the bearing modulus λperf close to λcr in a range corresponding to the transition between mixed-film lubrication and hydrodynamic lubrication.