Superhard Bearing Assembly for Shaft Misalignment in Drilling
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Solution Overview
Problem
Conventional radial-bearing assemblies in subterranean drilling systems experience performance degradation and potential failure due to axial misalignment of the rotor with respect to the stator, caused by repeated deflection of the output shaft during drilling operations.
Innovation Solution
The proposed bearing assembly includes a support ring surrounding a central bearing axis and a plurality of superhard bearing elements with partial-ellipsoidal surfaces, oriented at oblique angles and distributed in multiple rows, to enhance contact and movement between opposing surfaces, thereby maintaining bearing performance despite axial misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional radial-bearing assemblies are used with standard bearing elements, then the structure is simple and easy to manufacture, but axial misalignment occurs due to repeated deflection of the output shaft, leading to performance degradation and bearing failure
Solution Approach 1:
The bearing elements are designed with spherical bearing surfaces that conform to a common spherical outline. This curvature allows the bearing elements to self-align and accommodate axial misalignment between the rotor and stator, maintaining reliable contact surfaces even when the output shaft deflects repeatedly during drilling operations.
Solution Approach 2:
The patent introduces oblique angular orientation of the bearing elements relative to the central bearing axis, transitioning from a conventional radial arrangement to a three-dimensional configuration. This angular distribution in multiple rows allows the bearing assembly to handle both radial and axial misalignment forces, resolving the reliability issue without excessive structural complexity.
2Ease of manufacture
If bearing elements are oriented radially outward to bear against opposing surfaces, then the bearing assembly is simple in design, but repeated shaft deflection causes axial misalignment between rotor and stator, resulting in bearing failure
Solution Approach 1:
The bearing elements are oriented at oblique angles relative to the central bearing axis rather than purely radially outward. This asymmetric angular configuration allows the bearing surfaces to maintain effective contact under misaligned conditions, improving bearing alignment reliability while remaining manufacturable using standard pressing or brazing techniques.
Solution Approach 2:
The spherical bearing surfaces of the elements are designed to conform to a common spherical outline, creating curved contact surfaces that naturally accommodate axial misalignment. This geometric curvature maintains reliable bearing performance even when the rotor becomes axially misaligned due to shaft deflection during drilling operations.
3Reliability
If superhard bearing elements with partial-ellipsoidal surfaces are oriented at oblique angles in multiple rows, then axial misalignment is compensated and bearing performance is maintained, but the manufacturing complexity and assembly difficulty increase
Solution Approach 1:
The partial-ellipsoidal bearing surfaces are designed to conform to a common spherical outline, creating self-aligning geometry. This curvature allows the bearing elements to automatically orient themselves correctly during assembly, reducing installation difficulty despite the complex oblique angular distribution in multiple rows.
Solution Approach 2:
The bearing elements are designed with specific geometric parameters including oblique angular orientation and partial-ellipsoidal surface shapes that can be manufactured using standardized pressing or brazing processes. These parameter optimizations maintain reliability under misalignment while controlling manufacturing complexity through established fabrication methods.
Data Source
AI summary
Bearing apparatus and related methods may include superhard contact elements coupled to support rings where the superhard contact element define an arcuate or a planar surface.