Concave Rotor Bearing Support for Precise Centering Across Diameters
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Solution Overview
Problem
Existing balancing machines face challenges in precisely centering and correcting the unbalance of rotors with varying diameters and axial positions, often risking damage due to high Hertzian stress during the process.
Innovation Solution
A bearing device with a bearing pedestal featuring concavely cylindrical bearing surfaces, allowing for symmetrical support of workpieces with different diameters, reducing Hertzian stress and enabling precise centering without damaging the workpiece, and incorporating adjustable bearing elements and a ventilation system for chip removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bearing elements are adapted exactly to the diameter of the workpiece bearing surface to precisely center the workpiece, then centering precision is improved, but adaptability to different workpiece diameters deteriorates
Solution Approach 1:
The bearing elements are made adjustable in their radial position, allowing dynamic adaptation to different workpiece diameters. The bearing elements can be moved radially outward or inward and fixed at different positions using locking screws, enabling the same bearing device to precisely center workpieces of varying diameters without requiring multiple specialized bearing elements.
Solution Approach 2:
The bearing device is divided into multiple independent bearing elements (typically three) that can be individually adjusted. This segmentation allows each bearing element to be independently positioned radially, providing flexibility in adapting to different workpiece diameters while maintaining precise centering capability.
2Ease of manufacture
If planar support surfaces are used to support workpieces, then manufacturing simplicity is improved, but contact stress (Hertzian stress) increases causing workpiece damage
Solution Approach 1:
The bearing surfaces of the bearing elements are given a concave curvature that matches the convex curvature of the workpiece bearing surfaces. This curved surface contact distributes the load over a larger area compared to planar contact, significantly reducing Hertzian stress and preventing workpiece damage while maintaining manufacturing feasibility through standard bearing element designs.
3Adaptability or versatility
If multiple bearing elements with different diameters are provided to handle different workpiece sizes, then adaptability is improved, but device complexity increases
Solution Approach 1:
Instead of providing multiple bearing elements with fixed different diameters, the invention uses bearing elements with adjustable radial positions. This dynamic adjustment capability allows a smaller number of identical bearing elements to handle a wide range of workpiece diameters, significantly reducing device complexity while maintaining high adaptability.
4Stability of the object's composition
If bearing elements are fixed in position to ensure stability, then mounting stability is improved, but adaptability to different workpiece diameters deteriorates
Solution Approach 1:
The bearing elements incorporate a two-state positioning system: during adjustment, they are movable to adapt to different workpiece diameters; during operation, they are fixed in position using locking screws to ensure mounting stability. This dynamic-adjustable-fixed cycle resolves the contradiction between stability and adaptability.
Data Source
AI summary
The invention relates to a device for receiving a workpiece in a bearing device for rotatably mounting the workpiece about a bearing axis (L) associated with a workpiece bearing surface. The device comprises a bearing pedestal (14) including a bearing element (1) which has two concavely cylindrical bearing surfaces (5, 6) that lie next to one another in the same bearing plane and symmetrically to a plane of symmetry containing the bearing axis (L), the cylinder radii of the cylindrical bearing surfaces being greater than the radius of the workpiece bearing surface for which the bearing device is intended, wherein the cylinder axes of the two bearing surfaces (5, 6) are parallel to the bearing axis (L) and have a distance between each other.