Bearing Preload Adjustment via Electrical Resistance Measurement
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Solution Overview
Problem
Setting preload in bearing assemblies, particularly with tapered and angular contact ball bearings, is a laborious and often inaccurate process, requiring complex methods to achieve a clearance-free support for shafts in housings.
Innovation Solution
The preload is set by measuring and adjusting the electrical resistance between the bearing inner and outer rings, using a resistance meter and adjusting the preload until a target resistance value is reached, which is determined through calibration, allowing for precise preload setting without complex methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frictional torque measurement method is used to set preload, then preload can be set, but the process is laborious and inaccurate
Solution Approach 1:
The patent replaces the mechanical frictional torque measurement method with an electrical resistance measurement method. Instead of measuring frictional torque through mechanical means, the invention measures electrical resistance between bearing rings, which directly correlates with preload. This substitution eliminates the laborious and inaccurate mechanical measurement process while providing a simpler and more accurate electrical measurement approach.
Solution Approach 2:
The invention changes the measurement parameter from mechanical frictional torque to electrical resistance. By measuring electrical resistance between the bearing inner and outer rings, which varies with preload conditions, the method provides a more accurate and easier way to determine preload compared to mechanical torque measurement. The electrical resistance parameter directly reflects the contact conditions between bearing components.
2Productivity
If mechanical measurement methods are used, then preload can be determined, but the process is time-consuming and complex
Solution Approach 1:
The patent replaces complex mechanical measurement systems with a simple electrical measurement system. A resistance meter connected to the bearing rings provides immediate electrical resistance readings that indicate preload levels, eliminating time-consuming mechanical measurement procedures and enabling faster preload setting.
Solution Approach 2:
The bearing assembly itself provides the measurement information through its electrical resistance properties. The resistance between bearing rings naturally varies with preload conditions, allowing the system to self-indicate its preload state without requiring external complex measurement equipment or procedures.
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
This method allows for simple and accurate preload setting within a prescribed tolerance, eliminating the influence of friction coefficient and enabling non-specialized workshops to perform the task effectively.
Implementation Method 1
simultaneous measuring of the electrical resistance between the bearing inner ring and the bearing outer ring
Data Source
AI summary
A method for setting a preload in a bearing assembly, the bearing assembly having at least one rolling-element bearing with at least one bearing inner ring and at least one bearing outer ring, the method including changing the preload in the bearing assembly starting from an initial value and measuring the electrical resistance between the bearing inner ring and the bearing outer ring and terminating the changing of the preload in the bearing assembly in response to a target value for the electrical resistance being reached.