Multi-Wedge Hydrodynamic Bearing for Lower Oil and Power Loss
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Solution Overview
Problem
Hydrodynamic sliding bearings exhibit high oil consumption and power loss while maintaining good dynamic characteristics and heat management, necessitating a design that reduces oil consumption without increasing bearing temperatures.
Innovation Solution
The design features a bearing shell with at least two surface sections arranged in the circumferential direction, forming a multi-wedge bore with one surface section as a load segment and another as a non-load segment, where a circle with a larger radius can be inscribed, and the center points of these circles have an eccentricity relative to the bearing shell center, with the load segment having greater eccentricity, allowing for optimized lubrication and reduced oil usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a multi-wedge bore bearing design is used to achieve good dynamic characteristics and heat management, then bearing damping and heat management are improved, but oil consumption and power loss increase
Solution Approach 1:
The bearing surface is divided into multiple surface sections (at least two) arranged in the circumferential direction, creating a multi-wedge bore configuration. Each surface section forms a wedge gap that contributes to pressure buildup, allowing the bearing to be segmented into functional zones that optimize both heat management and reduce oil consumption
Solution Approach 2:
Different surface sections are designed with different properties: load segments with higher eccentricity for supporting bearing forces, and non-load segments with lower eccentricity for reduced oil consumption. This local differentiation allows optimal performance in each zone while balancing overall bearing performance
2Reliability
If a multi-wedge bore bearing design is used to achieve good dynamic characteristics, then dynamic characteristics are improved, but oil consumption increases
Solution Approach 1:
The bearing surface is divided into multiple surface sections (at least two) arranged in the circumferential direction, creating a multi-wedge bore configuration. Each surface section forms a wedge gap that contributes to pressure buildup, allowing the bearing to be segmented into functional zones that optimize both heat management and reduce oil consumption
Solution Approach 2:
Different surface sections are designed with different properties: load segments with higher eccentricity for supporting bearing forces, and non-load segments with lower eccentricity for reduced oil consumption. This local differentiation allows optimal performance in each zone while balancing overall bearing performance
3Loss of energy
If surface sections with different eccentricity are used to reduce oil consumption, then oil consumption and power loss are reduced, but bearing temperature management becomes more challenging
Solution Approach 1:
The bearing surface is divided into multiple surface sections (at least two) arranged in the circumferential direction, creating a multi-wedge bore configuration. Each surface section forms a wedge gap that contributes to pressure buildup, allowing the bearing to be segmented into functional zones that optimize both heat management and reduce oil consumption
Solution Approach 2:
Different surface sections are designed with different properties: load segments with higher eccentricity for supporting bearing forces, and non-load segments with lower eccentricity for reduced oil consumption. This local differentiation allows optimal performance in each zone while balancing overall bearing performance
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 configuration results in lower oil consumption and power loss while maintaining sufficient damping and preventing significant increases in bearing temperatures, even under full-load conditions.
Implementation Method 1
a hydrodynamic lubricating film of oil is formed during rotation of the shaft if a suitable oil supply is available
Implementation Method 2
the individual surface sections in each case create a wedge gap (multi-wedge bore) and thus, respectively also a pressure build up in a lubricating oil
Data Source
AI summary
A hydrodynamic sliding bearing, including: a housing shell including an inner surface which forms a bearing surface configured for a rotating shaft having a radius, the housing shell including a center point, the bearing surface including at least two surface sections which are arranged one behind the other in a circumferential direction of the bearing shell, the at least two surface sections including at least one first surface section and at least one second surface section, the at least one second surface section forming a load segment, the at least one first surface section forming a non-load segment, the at least two surface sections each configured for being inscribed thereinto in an axial section with a respective circle, the respective circle of each of the at least two surface sections each having a radius that is larger than the radius of the rotating shaft and each having a center point each of which exhibits a respective eccentricity relative to the center point of the housing shell, the eccentricity of the load segment being greater than the eccentricity of the non-load segment.