Slide Bearing Throttling Elements Lubricant Flow Control
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Solution Overview
Problem
Slide bearings in internal combustion engines face issues with excessive lubricant outflow due to temperature-induced widening of the bearing gap, leading to pressure drops and increased wear of moving parts, which existing solutions attempt to address by using high-pressure pumps or heavy, costly light-metal housings.
Innovation Solution
Incorporation of throttling elements within the bearing gap, such as shut-off elements or sealing lips, to regulate lubricant flow and maintain constant pressure, allowing for the use of smaller, less expensive pumps and ensuring consistent lubrication over a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the bearing gap is reduced to minimize lubricant outflow, then lubricant retention is improved, but manufacturing precision and assembly tolerance become more difficult to maintain
Solution Approach 1:
The patent introduces throttling elements as intermediary components within the bearing gap to control lubricant flow. These elements act as mediators between the bearing surfaces, providing flow restriction without requiring tight manufacturing tolerances on the bearing gap itself. The throttling elements can be adjusted or replaced independently to optimize lubricant retention.
Solution Approach 2:
The patent changes the flow parameters by introducing throttling elements that create localized flow resistance. This allows the bearing gap dimensions to remain within standard manufacturing tolerances while still achieving reduced lubricant outflow through the throttling effect of the added elements.
2Stress or pressure
If high-pressure pumps are used to maintain oil pressure against gap widening, then lubricant pressure is maintained, but device complexity and cost increase
Solution Approach 1:
The throttling elements serve as intermediary flow control components that work in conjunction with standard-pressure pumps. They provide the necessary flow resistance to maintain pressure without requiring high-pressure pumping systems, thereby reducing overall system complexity.
Solution Approach 2:
The throttling elements create a self-regulating system where the flow resistance is inherent in the bearing structure itself. The lubricant pressure is maintained through the flow restriction provided by the throttling elements rather than requiring continuously high-pressure pumping, allowing for simpler pump systems.
3Temperature
If the bearing gap is allowed to widen with temperature, then thermal expansion is accommodated, but lubricant outflow increases and pressure drops
Solution Approach 1:
The throttling elements act as temperature-compensating intermediaries that maintain flow resistance despite changes in bearing gap dimensions. As the bearing expands thermally, the throttling elements continue to provide the necessary flow restriction, preventing excessive lubricant outflow even when the gap widens.
Solution Approach 2:
The patent changes the flow dynamics by introducing elements that create flow resistance independent of the bearing gap dimensions. This allows the system to accommodate thermal expansion while maintaining controlled lubricant flow through the throttling effect.
4Stability of the object's composition
If cast beds are used in light-metal housings to reduce radial widening, then bearing gap stability is improved, but engine weight and production costs increase
Solution Approach 1:
The throttling elements serve as intermediary flow control components that decouple bearing gap stability from housing material selection. By providing flow restriction through the throttling elements, the system can use lighter materials for the housing without compromising lubricant retention, as the throttling elements compensate for gap variations.
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
Prevents excessive lubricant outflow and pressure drops, reducing wear on moving parts while eliminating the need for high-pressure pumps and heavy light-metal housings, ensuring reliable lubrication across varying temperatures.
Implementation Method 1
at least one throttling element for throttling the lubricant flow through the bearing gap
Implementation Method 2
means for supplying a lubricant to the bearing gap which can subsequently be removed from the bearing gap
Data Source
AI summary
A slide bearing for supporting a shaft and comprising at least one bearing shell for receiving the shaft. The bearing shell and the surface of the shaft define a bearing gap. Also described is a mechanism for supplying a lubricant to the bearing gap so that the lubricant can be removed therefrom. To compensate for negative effects of a temperature-dependent change of the bearing gap, there is provided at least one throttling element for throttling the flow of lubricant through the bearing gap.