Grooved Nut Recess Geometry for Bearing Clamping Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Grooved nuts used to secure bearing inner rings on shafts experience high deformations under axial loads, leading to reduced clamping strength and potential failure due to conical deformation of the threaded bore, which unloads initial threads and overloads last threads.
Innovation Solution
A grooved nut design with recesses of reduced axial depth and a radial flange extension, where the axial depth of the recess is between 0.3D and 0.7D, and radial depth between 0.4B and 0.6B, and an L-shaped profile, to reduce conical deformation and enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If grooved nuts are used to secure bearing inner rings on shafts under high axial loads, then the clamping force is sufficient to secure the bearing, but the grooved nut experiences conical deformation of the threaded bore which leads to loss of clamping strength and potential failure
Solution Approach 1:
The patent applies local quality by creating recesses at specific locations on the outer circumferential surface of the grooved nut. These recesses are positioned to allow localized deformation in controlled areas while preserving the structural integrity of the threaded bore. The recesses have specific dimensional parameters (depth between 0.3D and 0.7D, radial depth between 0.4B and 0.6B) that optimize the balance between allowing necessary deformation and preventing conical deformation of the threads.
Solution Approach 2:
The grooved nut is segmented by introducing recesses that divide the outer circumferential surface into distinct regions. This segmentation allows different parts of the nut to deform independently under load, preventing uniform conical deformation of the entire threaded bore. The recesses create zones that can accommodate deformation while maintaining the overall structural stability of the nut.
2Stability of the object's composition
If the axial depth of the recess is reduced to between 0.3D and 0.7D, then conical deformation of the threaded bore is reduced by up to 45%, but the recess does not extend through the full axial thickness which may limit deformation accommodation
Solution Approach 1:
The patent optimizes the axial depth parameter of the recesses to be between 0.3D and 0.7D of the total axial thickness D. This parameter change creates an optimal balance: the recesses are deep enough to provide deformation relief and reduce conical deformation of the threaded bore by up to 45%, but not so deep that they compromise the overall structural strength and stability of the nut body.
3Ease of manufacture
If the grooved nut has a segmented shape with axially continuous grooves, then the nut can be manufactured and installed, but the segmented regions are prone to conical deformation under high axial loads
Solution Approach 1:
The patent transitions from traditional axially continuous grooves to recesses that extend radially into the outer circumferential surface. This dimensional change from axial segmentation to radial segmentation fundamentally alters the deformation behavior. The radial recesses prevent the propagation of conical deformation along the axial direction while maintaining manufacturability through standard machining operations.
Data Source
AI summary
A grooved nut for axially securing an inner ring of a bearing that is mounted on an axle or shaft includes a body portion surrounding a threaded inner bore. The body portion has a circumferential outer surface and an axial thickness, the outer surface includes at least one recess, and an axial depth of the recess is smaller than the axial thickness.