Optical Lock Nut Alignment for Repeatable Bearing Preload
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for preloading antifriction bearings in drive trains, such as truck axle bearings, face challenges in achieving accurate and repeatable preload settings under in-field conditions due to cumbersome assembly procedures and resistive drag torque from inner seals, making it difficult to apply the optimal axial compressive deflection for bearing longevity.
Innovation Solution
A preload apparatus with a press mechanism and optical alignment system that provides a compressive load to the bearing and aligns the lock nut with a shaft slot, using a wrench to rotate the nut and ensure proper engagement, allowing for precise and repeatable preload adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional methods are used to preload bearings in field conditions, then the assembly procedure is simple, but the preload accuracy and repeatability deteriorate due to cumbersome procedures and resistive drag torque from inner seals
Solution Approach 1:
The patent applies preliminary action by pre-aligning the lock nut with the shaft slot using an optical alignment system before applying the preload force. This ensures that the nut is properly positioned and aligned prior to the preload operation, eliminating the need for complex adjustments during the actual preload application and improving both accuracy and ease of operation.
Solution Approach 2:
The patent introduces a press mechanism as an intermediary device between the operator and the bearing assembly. This press mechanism applies the preload force in a controlled manner while the optical alignment system serves as an intermediary to ensure proper alignment, thereby improving preload accuracy without significantly increasing operational complexity.
2Manufacturing precision
If the lock nut is contacted during preload application, then the bearing can be preloaded, but the alignment precision deteriorates due to interference with lock nut rotation
Solution Approach 1:
The patent segments the preload apparatus into distinct functional components: an optical alignment system for alignment, a press mechanism for applying preload, and a lock nut alignment feature. This segmentation allows each component to perform its specific function without interfering with others, maintaining alignment precision while managing device complexity through modular design.
Solution Approach 2:
The apparatus performs preliminary alignment of the lock nut with the shaft slot using the optical alignment system before the preload force is applied. This preliminary action ensures that the nut is properly positioned and will not interfere with alignment during preload application, thereby maintaining manufacturing precision.
3Duration of action of stationary object
If the bearing preload is adjusted to achieve optimal axial compressive deflection, then bearing longevity is improved, but the operation becomes difficult due to resistive drag torque from inner seals
Solution Approach 1:
The press mechanism serves as an intermediary that applies the preload force in a controlled manner, overcoming the resistive drag torque from inner seals. This allows the optimal axial compressive deflection to be achieved without requiring excessive manual force, thereby improving bearing longevity while maintaining ease of operation.
Solution Approach 2:
The optical alignment system provides visual feedback to ensure proper alignment during the preload adjustment process. This feedback mechanism helps operators achieve the optimal axial compressive deflection more easily by providing clear alignment indicators, thereby improving bearing longevity without significantly increasing operational difficulty.
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
The solution enables accurate and repeatable preload adjustments, ensuring optimal bearing performance by minimizing contact with the lock nut during preload application and allowing for precise alignment and rotation, thus enhancing bearing longevity and ease of assembly.
Implementation Method 1
An optical sending unit is configured to output a high intensity light to allow a user to locate a shaft slot of the shaft to align the press mechanism relative to the shaft
Data Source
AI summary
An apparatus for providing a load on a bearing mounted to a shaft includes an attaching member releasably connectable to the shaft. A press mechanism is coupled to the attaching member and is configured to provide a compressive load to the bearing. An optical sending unit is configured to output a high intensity light to allow a user to locate a shaft slot of the shaft to align the press mechanism relative to the shaft when the attaching member connects to the shaft.