Offset Multi-Wedge Hydrodynamic Bearing Damping
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Solution Overview
Problem
Conventional lemon play bearings exhibit strongly orthotropic dynamic properties, resulting in high rigidity and damping in the main load direction but significantly lower rigidity and damping in deviating directions, leading to uneven performance.
Innovation Solution
A hydrodynamic plain bearing with an offset multi-wedge bore design, where circular segment-shaped surface segments are displaced along an offset plane relative to the bearing shell's center, reducing orthotropic dynamic properties and improving relative bearing damping by creating a lower profiling and enhancing oil distribution through strategically placed oil bores and grooves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional lemon play bearing design is used, then high rigidity and damping are achieved in the main load direction, but significantly lower rigidity and damping occur in deviating directions
Solution Approach 1:
The patent applies asymmetry by offsetting the center of the bearing surface segments relative to the bearing shell center, creating an asymmetric multi-wedge bore configuration. This asymmetric design redistributes the load support more evenly across different directions, reducing the strongly orthotropic dynamic properties while maintaining adequate rigidity in the main load direction.
2Loss of energy
If conventional lemon play bearing design is used, then high damping is achieved in the main load direction, but significantly lower damping occurs in deviating directions
Solution Approach 1:
The asymmetric offset of surface segments creates more uniform oil film distribution across different directions, improving damping in deviating directions while maintaining adequate damping in the main load direction, thus reducing the directional disparity in damping characteristics.
Solution Approach 2:
The patent applies local quality by creating different wedge configurations in different regions of the bearing. The offset multi-wedge bore design creates locally optimized oil film thickness distributions that provide enhanced damping where needed while maintaining overall directional uniformity.
3Loss of energy
If surface segments are offset to reduce orthotropic properties, then relative bearing damping is improved, but bearing rigidity may be compromised
Solution Approach 1:
The patent applies parameter changes by carefully controlling the offset distance and wedge angle parameters. By optimizing these geometric parameters, the design achieves improved relative bearing damping while maintaining adequate bearing rigidity through the balanced multi-wedge configuration.
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 offset multi-wedge bore design reduces orthotropic dynamic properties and enhances relative bearing damping, resulting in improved performance across various load directions and operating conditions without the need for bearing changes.
Implementation Method 1
hydrodynamic plain bearing with a multi-wedge bore design... forms a converging gap or converging gaps with the outer, circular cross-section surface of the shaft to be supported... to form supporting pressures in the lubricating gap
Implementation Method 2
the orthotropic dynamic properties of which are less pronounced and which has better relative bearing damping, ie better damping in relation to rigidity
Data Source
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AI summary
The invention relates to a hydrodynamic plain bearing, comprising a bearing shell, the inner surface of which forms a bearing surface for a rotating shaft or the like; wherein the bearing surface, in order to form a bearing having a multi-wedge bore, comprises a plurality of surface segments, which are arranged one after the other in the circumferential direction of the bearing shell and which each form a circle segment having a radius R by means of the inner circumference of said surface segments, the center point of the circle segment of each surface segment being shifted in relation to a center point of the bearing shell by an eccentricity d; and the bearing shell has two bearing-shell halves, which each extend over 180° of the bearing surface and are joined at a joint in a joint plane. The invention is characterized in that at least one surface segment is offset from the center point of the bearing shell by an offset e along an offset plane, wherein the offset plane is at angle to the joint plane in the circumferential direction of the bearing shell.