Three-Point Contact Bearing Unit for Low-Oscillation Marble Cutting
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Solution Overview
Problem
Bearing units in the marble cutting industry face challenges with high stress and reduced service life due to excessive tilting moments and axial play, caused by distributed forces from diamond wire cutting, which results in poor cut quality and increased waste, especially when using bearing units with two contact points between the rings and balls.
Innovation Solution
A bearing unit design with three contact points between the rolling bodies and raceways, where each ball has contact points aligned with the symmetry plane, distributing axial forces through multiple lines of action, reducing oscillations and stress, and utilizing annular raceway portions separated by circumferential grooves for reduced axial dimensions and improved lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If bearing units use two contact points between rings and balls, then axial dimensions can be reduced, but axial play increases causing outer ring oscillation and poor cut quality
Solution Approach 1:
The invention segments the contact interface by providing multiple contact points (at least three) between the rolling bodies and raceways, rather than using a single contact point. This segmentation distributes the load and reduces axial play while maintaining compact dimensions, resolving the contradiction between reduced axial size and improved cut quality.
Solution Approach 2:
The invention moves from a two-dimensional contact model (two contact points) to a three-dimensional contact configuration (at least three contact points distributed in space), creating a more rigid constraint system that reduces axial oscillation while maintaining compact axial dimensions.
2Device complexity
If bearing units use two contact points between rings and balls, then device complexity is reduced, but resistance to eccentric loads decreases causing high contact pressures
Solution Approach 1:
The bearing structure is segmented into multiple contact points (at least three) between rolling bodies and raceways, distributing the eccentric loads across multiple locations. This segmentation increases resistance to eccentric loads without significantly increasing overall device complexity, as the additional contact points are integrated into the existing bearing geometry.
Solution Approach 2:
The raceways are pre-configured with specific geometries (annular portions separated by circumferential grooves) that establish multiple contact points before operation. This preliminary geometric configuration ensures proper load distribution and resistance to eccentric loads from the start of operation.
3Force
If bearing units have larger axial dimensions to withstand axial loads in both directions, then load capacity improves, but axial play in the bearing unit increases causing outer ring oscillation
Solution Approach 1:
The invention transitions from a two-contact-point configuration to a multi-contact-point (at least three) configuration, creating a three-dimensional constraint system that simultaneously provides axial load capacity in both directions while minimizing axial play and outer ring oscillation, thereby maintaining high cut quality.
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 three-contact-point design enhances the mechanical rigidity and resistance to eccentric forces, minimizing oscillations and improving cut quality while maintaining compact axial dimensions, thus extending the service life and reducing waste in marble cutting machines.
Implementation Method 1
a row of rolling bodies, or balls (32), interposed between the outer ring (31) and the inner ring (33) to enable the relative rotation thereof
Implementation Method 2
The circumferential grooves (36, 37) are provided for containing lubricating grease
Data Source
AI summary
A bearing unit (10, 10′) has a radially outer ring (31). The outer ring (31) is rotatable with respect to an axis of rotation (X) and is provided with a radially inner raceway (31r). A stationary radially inner ring (33) is provided with a radially outer raceway (33r). A row (132) of rolling bodies (32) is interposed between the radially outer ring (31) and the radially inner ring (33). Each rolling body (32) has three contact points (P1, P2, P3) with the raceways (31r, 33r) of the radially outer ring (31) and, respectively, the radially inner ring (33).