Hydrodynamic Sliding Bearing with Multi-Wedge Bore Segments
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Solution Overview
Problem
Hydrodynamic plain bearings face high oil consumption and power loss while maintaining good dynamic properties and heat management, leading to increased bearing temperatures.
Innovation Solution
A hydrodynamic plain bearing design with a bearing shell featuring at least two surface sections arranged in the circumferential direction, where one section is a load segment and the other a non-load segment, with varying eccentricities and strategically positioned oil supply pockets to optimize lubrication and reduce oil usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a multi-wedge bore bearing design is used to achieve good dynamic properties 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 wedge sections (first wedge section, second wedge section, third wedge section) with different eccentricities. This segmentation allows each section to contribute differently to load bearing and lubrication, optimizing the balance between heat management and power loss
Solution Approach 2:
Different wedge sections have different local geometric properties, specifically different eccentricities (e1, e2, e3) with e1 > e2 > e3. The first wedge section has higher eccentricity for better load bearing, while subsequent sections have progressively lower eccentricity to reduce oil consumption and power loss in regions where full load bearing is not required
2Force
If higher eccentricity is used in all surface sections to improve load bearing capacity, then carrying capacity is improved, but oil consumption increases
Solution Approach 1:
The bearing surface is divided into multiple wedge sections with different local geometric properties, specifically different eccentricities. The first wedge section has higher eccentricity for better load bearing, while subsequent sections have progressively lower eccentricity to reduce oil consumption and power loss in regions where full load bearing is not required
Solution Approach 2:
The bearing surface is segmented into multiple wedge sections, each optimized for its specific functional requirement. This allows the bearing to achieve high carrying capacity where needed while minimizing oil consumption in non-critical regions
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 design achieves lower oil consumption and power loss without significant temperature increases, ensuring sufficient damping under both no-load and full-load conditions.
Implementation Method 1
a hydrodynamic lubricating film forms between the outer peripheral surface of the revolving or rotatable shaft and the surface sections forming the inner peripheral surface of the plain bearing
Implementation Method 2
the individual surface sections each generate a wedge gap (multi-wedge bore) and thus also a respective pressure build-up in a lubricating oil
Data Source
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AI summary
The invention relates to a hydrodynamic sliding bearing (1) having a bearing shell (2), the inner surface of which forms a bearing surface (3) for a rotating shaft (5), wherein the bearing surface (3) has at least two surface portions (6, 7), which are arranged one behind the other in the circumferential direction of the bearing shell (2), for forming a bearing with multi-wedge bore. At least one surface portion (7) forms a load segment (17), and at least one surface portion (6) forms a non-load segment (16). A circle (K1, K2) can be written in an axial section into each of the at least two surface portions (6, 7), which circle has a larger radius (R1, R2) than the radius (Rw) of the rotating shaft (5).