Bearing Preload Press Mechanism for Accurate Lock Nut Adjustment
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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 optimize bearing life and adjust lock nut systems effectively.
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, including a piston that extends or retracts based on fluid pressure changes, and a keeper retaining member that engages the lock nut to inhibit movement and ensure proper alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional manual methods are used to preload bearings, then the assembly process is simple, but the preload accuracy and repeatability deteriorate under in-field conditions
Solution Approach 1:
The system pre-sets the desired preload value before the bearing assembly process begins. The controller is programmed with target preload parameters, and the actuation mechanism is pre-configured to apply the correct force, eliminating the need for complex manual calculations and adjustments during assembly.
Solution Approach 2:
The system incorporates sensors that continuously monitor the actual preload applied to the bearing and provide real-time feedback to the controller. The controller compares the measured preload against the target value and automatically adjusts the actuation mechanism to achieve precise preload, ensuring repeatability under various field conditions.
2Reliability
If inner seals are installed in the bearing assembly, then the sealing function is improved, but resistive drag torque increases making preload adjustment difficult
Solution Approach 1:
The system replaces manual mechanical adjustment methods with an automated actuation mechanism. The actuator applies controlled force to the bearing assembly, overcoming the resistive drag torque from the inner seals without requiring manual intervention. This substitution eliminates the operational difficulty while maintaining the sealing function.
3Reliability
If lock nut systems are used to retain bearings, then the bearing retention is improved, but the alignment and adjustment precision deteriorates
Solution Approach 1:
The system uses a dynamic adjustment mechanism that allows the lock nut to be precisely positioned and adjusted during the assembly process. The actuation mechanism applies controlled forces to achieve accurate alignment before the lock nut is fully tightened, ensuring both precise alignment and reliable retention. The system transitions from a static fixed-position approach to a dynamic adjustable approach.
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
Enables accurate and repeatable preload adjustments for bearings, ensuring optimal bearing life and simplifying the assembly process by providing a reliable means to apply and monitor compressive loads, thus overcoming the limitations of prior art methods.
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, including 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.