Roller Bearing Preload Assembly for Consistent Torque Locking
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Solution Overview
Problem
Current preload assemblies for roller bearings lack a standardized and efficient method to achieve the correct preload torque, leading to inconsistent bearing performance and potential mechanical failures.
Innovation Solution
A preload assembly comprising a threaded bolt with a compression head and hex head, an anti-rotational washer, a serrated edge locking washer, and a locking nut, which are designed to provide a precise preload by regulating the thread length and diameter, ensuring consistent torque application to the bearings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a standardized preload assembly with specific thread dimensions is used, then manufacturing precision and consistency are improved, but device complexity increases due to multiple components
Solution Approach 1:
The preload assembly is divided into distinct functional components: a threaded bolt with compression head, anti-rotational washer, serrated edge locking washer, and locking nut. Each component performs a specific function (preload application, rotation prevention, locking, and securing), allowing for standardized manufacturing of individual parts while achieving consistent overall preload torque through the assembled system.
2Reliability
If multiple locking mechanisms are incorporated, then reliability is improved, but ease of operation deteriorates due to more steps in assembly and disassembly
Solution Approach 1:
The anti-rotational washer and serrated edge locking washer are pre-positioned on the bolt before final tightening. The locking notches are预先 formed in the locking nut to engage with the serrated edges. This preliminary arrangement of components ensures that when the locking nut is tightened, the locking mechanisms automatically engage without requiring additional assembly steps, thus maintaining reliability while preserving ease of operation.
3Reliability
If the compression head with channel and wall structure is used, then bearing performance is improved through precise preload control, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise thread parameters including major diameter (0.625-0.875 inches), thread length (7-27 threads on shaft, 6-18 on compression head), and overall length (1.5-3.5 inches). These controlled parameter variations within defined ranges allow manufacturers to achieve consistent preload torque while accommodating normal manufacturing tolerances, balancing bearing performance requirements with manufacturability.
Data Source
AI summary
A preload assembly for bearings comprising in combinations a threaded bolt, an anti-rotational washer, a serrated edge locking washer, and a threaded locking nut having a shallow outer profile and at least four locking notches in an outer edge thereof.