Multi-row Ball Bearing with Divided Gothic Arch Rings
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Solution Overview
Problem
Multi-row ball bearings used in drilling operations face challenges with high axial loads, harsh environmental conditions, poor lubrication, and difficulty in maintenance due to integrated designs that require replacement of entire units upon damage.
Innovation Solution
A multi-row ball bearing design featuring Gothic arch raceway surfaces on divided outer and inner rings, allowing for four-point contact with balls and facilitating easier maintenance by allowing individual replacement of damaged components, with specific material compositions and dimensions for enhanced durability and load resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the inner ring is formed as an integrated type with multi-row inner ring raceway surface, then axial load is uniformly received in each row, but the bearing cannot be easily inspected or maintained and requires entire bearing replacement upon damage
Solution Approach 1:
The patent divides the integrated inner ring into multiple separate inner rings, each with its own raceway surface. This segmentation allows individual inspection and replacement of damaged components while maintaining the unified load-bearing function through the multi-row configuration of separate bearing units.
2Strength
If numerous inner ring raceway surfaces are formed by making the inner ring wider, then high axial load capacity is achieved, but manufacturing accuracy requirements increase and grooves must be accurately machined
Solution Approach 1:
By segmenting the bearing into multiple independent bearing units with separate inner rings, the manufacturing complexity and accuracy requirements for the overall structure are reduced. Each individual unit can be manufactured with standard precision, avoiding the need for high-precision machining of complex integrated multi-row raceways.
3Strength
If the bearing is designed to withstand high axial loads in vertical directions, then load resistant performance is improved, but the bearing becomes more complex and harder to maintain
Solution Approach 1:
The patent achieves high load resistant performance through a multi-row configuration of separate bearing units, where each unit handles specific directional loads. This modular segmentation maintains structural functionality while simplifying maintenance, as individual units can be inspected and replaced independently.
Solution Approach 2:
Each bearing unit is designed with specific local characteristics optimized for its directional load requirements, while the overall assembly provides comprehensive load resistance in multiple vertical directions. This local optimization maintains performance without requiring excessive overall complexity.
Data Source
AI summary
Provided is a multi-row ball bearing that includes an outer ring, an inner ring, and two or more rows of balls retained by raceway surfaces of the outer and inner rings. Each of the raceway surfaces is formed as a Gothic arch groove, and the outer and inner rings are division races that are divided on at least one of the raceway 5 surfaces at a middle position of the raceway surface.