Fluid-Press Bearing Preload Control for Repeatable Axial Deflection
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Solution Overview
Problem
Existing methods for preloading antifriction bearings, such as those in truck axle assemblies, 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 maintain the optimal axial compressive deflection for bearing longevity.
Innovation Solution
A system comprising a press mechanism with a fluid source and proximity sensors that applies a compressive load to the bearing, allowing for precise control and monitoring of the preload, using a piston that extends or retracts based on fluid pressure changes, ensuring the desired preload is achieved and maintained.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional manual methods are used to preload bearings, then the assembly procedure is simple, but the preload accuracy and repeatability deteriorate due to cumbersome procedures and resistive drag torque
Solution Approach 1:
The patent replaces manual mechanical torque application with an automated press mechanism that uses fluid pressure to apply precise axial compressive loads to the bearing. This substitution eliminates the variability and inaccuracy of manual methods while providing repeatable preload settings through controlled fluid pressure application.
Solution Approach 2:
The patent incorporates sensors that monitor the axial compressive deflection of the bearing during the preload process. This feedback mechanism allows the system to detect when the optimal preload is achieved and maintain it consistently, resolving the accuracy issue while the automated control system manages the complexity.
2Duration of action of stationary object
If manual torque application is used, then the equipment is simple, but the bearing longevity deteriorates due to inability to maintain optimal axial compressive deflection
Solution Approach 1:
The automated press mechanism with fluid pressure control replaces imprecise manual torque application, enabling precise control of axial compressive deflection. This ensures the bearing is preloaded to the optimal level consistently, maximizing its service life while achieving the required manufacturing precision.
Solution Approach 2:
The sensor system continuously monitors the bearing's axial compressive deflection and provides feedback to the control system. This closed-loop control ensures that the optimal preload is achieved and maintained, directly impacting bearing longevity while demonstrating the precision capability of the system.
3Reliability
If traditional assembly methods are used, then the process is quick, but the repeatability of preload settings deteriorates due to resistive drag torque from inner seals
Solution Approach 1:
The automated press mechanism eliminates the variability introduced by manual operations and resistive drag torque from inner seals. By using fluid pressure to apply axial load directly, the system achieves repeatable preload settings without the inconsistencies of manual torque application, while the automated process maintains efficiency.
Solution Approach 2:
The sensor system detects the actual axial compressive deflection achieved during assembly and provides feedback to ensure repeatability. This closed-loop control compensates for resistive forces from inner seals and other variables, ensuring consistent preload settings across multiple assemblies without significantly increasing time loss.
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 solution enables accurate and repeatable preload adjustments for bearings, enhancing their longevity by ensuring the optimal axial compressive deflection is consistently maintained, even in challenging assembly environments.
Implementation Method 1
a press mechanism with a fluid source and proximity sensors that applies a compressive load to the bearing, allowing for precise control and monitoring of the preload, using a piston that extends or retracts based on fluid pressure changes
Data Source
AI summary
A system for providing a load on a bearing mounted to a shaft includes an attaching member releasably connectable to the shaft and a press mechanism in fluid communication with a source of fluid and configured to provide a compressive load to the bearing. The press mechanism includes a switch having a base and a piston in communication with the fluid such that an increase in a pressure of the fluid results in the piston extending upwardly from the base and a decrease in the pressure of the fluid results in the piston retracting toward the base. The switch includes a lower proximity sensor and a higher proximity sensor. The piston is configured to extend upwardly from the base past the lower proximity sensor and to trip the higher proximity sensor. The switch is configured to control the increase in the pressure in response to the piston tripping the higher proximity sensor.