Adjustable Bearing Sleeve Elements for Turbocharger Shaft Alignment
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Solution Overview
Problem
Existing bearing devices for turbocharger shafts face misalignment issues due to temperature changes and laborious assembly processes, particularly in high-speed applications where precise axial spacing and stability are critical.
Innovation Solution
A bearing device with axially adjustable and preloadable bearing sleeve elements, guided coaxially and secured by a spring element, ensures play-free operation and tilting stability by allowing axial movement while preventing tilting, and can be assembled in a shortened form for easy adjustment and secure mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single outer bearing sleeve is used with fixed axial spacing between bearing elements, then the structure is simple, but misalignment occurs due to thermal expansion at high temperatures
Solution Approach 1:
The outer bearing sleeve is divided into two separate bearing sleeve elements that can be adjusted independently. This segmentation allows each element to be positioned to compensate for thermal expansion, maintaining precise axial spacing between bearing elements even at high temperatures.
Solution Approach 2:
The bearing sleeve elements are made adjustably dynamic rather than fixed. The axial spacing between the two bearing sleeve elements can be modified to accommodate thermal expansion, transforming the static structure into a dynamically adaptable one that maintains precision under varying temperature conditions.
2Manufacturing precision
If separate bearing sleeve elements are used with adjustable axial spacing, then alignment precision is improved, but assembly process becomes more complex
Solution Approach 1:
The bearing sleeve elements are pre-adjusted to the correct axial spacing during assembly. This preliminary action ensures that when the bearing is installed, the alignment is already optimized, simplifying the overall assembly process while maintaining high precision.
Solution Approach 2:
A guide device is introduced as an intermediary mechanism to control and standardize the axial spacing between bearing sleeve elements. This guide device simplifies the adjustment process by providing a predetermined spacing mechanism, making assembly easier while ensuring precision.
3Adaptability or versatility
If bearing sleeve elements are made adjustable in axial direction, then thermal expansion compensation is achieved, but device complexity increases
Solution Approach 1:
The bearing sleeve is segmented into adjustable elements that can independently compensate for thermal expansion. This segmentation provides the necessary adaptability while keeping each individual element relatively simple in structure.
Solution Approach 2:
The axial spacing parameter between bearing sleeve elements is made variable to compensate for thermal expansion. By allowing this parameter to change in response to temperature variations, the bearing adapts to thermal conditions without requiring complex active control mechanisms.
4Temperature
If shaft length increases due to thermal expansion, then operating temperature range is improved, but bearing alignment is compromised
Solution Approach 1:
The bearing sleeve elements are designed with dynamic adjustability to compensate for shaft length changes due to thermal expansion. This allows the bearing alignment to be maintained across a wide operating temperature range by adjusting the axial spacing as the shaft expands or contracts.
Solution Approach 2:
The bearing device explicitly accounts for thermal expansion by designing the axial spacing between bearing sleeve elements to compensate for shaft length changes. The guide device and adjustment mechanism are configured to maintain proper bearing alignment even as the shaft expands at high operating temperatures.
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 stable, play-free operation of rolling bearings across varying temperatures and high-speed conditions, ensuring long service life and reduced assembly complexity by allowing for thermal expansion compensation and secure mounting through axial preloading and coaxial guidance.
Implementation Method 1
the two bearing sleeve elements can be adjusted and/or fixed and/or preloaded by means of a spring element in the axial direction
Data Source
AI summary
A bearing device for a shaft has at least two axially spaced-apart, radial anti-friction bearings with rolling bodies. In each of the anti-friction bearings, an inner race is formed for the rolling bodies on an inner bearing element which is connected fixedly to the shaft. An outer race is formed for the rolling bodies on an outer bearing sleeve having at least two bearing sleeve elements which are guided coaxially with respect to one another in a guide device. Each of the anti-friction bearings is assigned a separate bearing sleeve element with in each case one anti-friction bearing running surface. The guide device converts a rotation of at least one of the bearing sleeve elements about the shaft longitudinal axis into a spacing change of the two bearing sleeve elements. The axial spacing between the bearing sleeve elements can be adjusted and/or fixed and/or prestressed with spring element.