Bearing Structure With Wave-Shaped Grooves For Low-Speed Stability
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Solution Overview
Problem
Current bearing structures with V-shaped grooves experience unstable disturbances and friction due to excessive film resistance when the rotating speed of the main shaft is reduced, while structures with oval-shaped grooves lack sufficient supporting pressure for heavy loads.
Innovation Solution
The proposed bearing structure features wave-shaped or groove groups with circular arc sections and connecting sections, designed to maintain a stable fluid film pressure even at reduced rotating speeds, preventing contact between the shaft and bearing surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If V-shaped grooves are used in the bearing structure, then the fluid film can provide maximum supporting pressure to support the main shaft, but when the rotating speed is extremely reduced, the film resistance becomes excessive and generates unstable disturbances resulting in friction between the main shaft and bearing structure
Solution Approach 1:
The patent replaces the conventional V-shaped groove with a wave-shaped groove that includes circular arc sections. The circular arc sections create a curved geometry that modifies the fluid film distribution, reducing film resistance at low speeds while maintaining adequate supporting pressure, thereby eliminating unstable disturbances and friction.
Solution Approach 2:
The patent changes the geometric parameters of the groove from a fixed V-shape to a wave-shaped profile with varying curvature. The wave-shaped groove includes sections with different radii of curvature (first radius R1 and second radius R2), which dynamically adjust the fluid film characteristics across different operating conditions, optimizing both supporting pressure and stability.
2Use of energy by moving object
If the main shaft rotates at reduced speed, then energy consumption is reduced, but the excessive film resistance from V-shaped grooves generates unstable disturbances and friction
Solution Approach 1:
The wave-shaped groove with circular arc sections creates a curved geometry that reduces fluid film resistance at low rotating speeds. This curvature design allows the bearing to maintain stable operation with minimal friction, enabling energy-efficient low-speed operation without sacrificing reliability.
3Reliability
If oval-shaped grooves are used, then film resistance is reduced, but sufficient supporting pressure cannot be provided for heavy loads
Solution Approach 1:
The wave-shaped groove design incorporates multiple sections with different geometric parameters, including circular arc sections with specific radii (R1 and R2) and connecting sections with defined angles. This multi-parameter geometry allows the groove to provide both low film resistance and sufficient supporting pressure, overcoming the limitations of simple oval-shaped grooves.
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 design ensures stable rotation without friction and adequate supporting pressure, addressing the limitations of V-shaped and oval-shaped grooves by maintaining low film resistance and sufficient supporting pressure across varying loads.
Implementation Method 1
a spaced distance is formed between the bearing structure and the main shaft, so as to receive a lubricating fluid, such as lubricating oil... the lubricating fluid can generate a fluid film to provide a sufficient pressure to support the main shaft
Implementation Method 2
Each of the wave-shaped grooves includes a first peak section, a second peak section, two first connecting sections, two second connecting sections and a trough section... the proposed bearing structure features wave-shaped or groove groups with circular arc sections and connecting sections, designed to maintain a stable fluid film pressure even at reduced rotating speeds
Data Source
AI summary
A bearing structure includes a plurality of wave-shaped grooves and an inner surface. The wave-shaped grooves are formed on the inner surface for receiving a lubricating fluid. Each of the wave-shaped grooves extends along a longitudinal axis of the bearing structure. Each of the wave-shaped grooves includes a first peak section, a second peak section, two first connecting sections, two second connecting sections and a trough section. The two first connecting sections are connected to opposite sides of the first peak section, and the two second connecting sections are connected to opposite sides of the second peak section. The trough section is disposed between the first peak section and the second peak section, and the trough section is connected to one of the first connecting sections and one of the second connecting sections. The first and second peak sections and the trough section have a circular arc structure.