Axle Bearing Preload Mechanism With External Adjustment Access
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Solution Overview
Problem
Existing axle assemblies face challenges in efficiently and accurately setting and adjusting bearing preload forces, often requiring disassembly and the use of shims, which can lead to inaccuracies and increased costs due to the need for precise axial positioning and potential variances from component installation or removal.
Innovation Solution
The axle assembly incorporates a preload mechanism with a rotatable preload element and an adjuster element, accessible from outside the housing, allowing for the external adjustment of bearing preload forces through a threaded and toothed engagement system, eliminating the need for internal disassembly and shims.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional shim-based methods are used to set bearing preload, then axial positioning can be achieved, but manufacturing precision and reliability deteriorate due to variances from component installation and removal
Solution Approach 1:
The patent replaces the traditional mechanical shim-based preload setting system with a threaded adjuster element system. The adjuster element engages with the preload element through threaded engagement, allowing precise axial positioning and preload adjustment without shims. This substitution eliminates the variability introduced by shim installation and removal, thereby improving both manufacturing precision and reliability of preload setting.
Solution Approach 2:
The patent enables continuous adjustment of the preload force parameter through rotation of the adjuster element. By changing the angular position of the adjuster element, the axial preload force can be precisely controlled and optimized. This parameter change capability allows for accurate preload setting that adapts to specific application requirements, improving both precision and reliability.
2Ease of operation
If internal disassembly is required to access preload elements, then bearing preload can be adjusted, but device complexity and ease of operation worsen due to disassembly requirements
Solution Approach 1:
The patent extracts the adjuster element functionality to be accessible from the external environment through an opening in the housing. The adjuster element protrudes through the housing wall, allowing operators to access and adjust the bearing preload without disassembling the housing or differential carrier. This extraction of the adjustment mechanism to the exterior significantly improves ease of operation while maintaining a relatively simple device structure.
3Manufacturing precision
If precise axial positioning is required for bearing preload, then manufacturing precision improves, but loss of time increases due to careful assembly and disassembly processes
Solution Approach 1:
The patent incorporates a threaded engagement system between the adjuster element and preload element that is pre-configured during manufacturing. The threaded features are built into the design, eliminating the need for time-consuming careful assembly processes. The adjuster element can be directly engaged and adjusted without requiring precise manual positioning, thereby reducing adjustment time while maintaining high axial positioning precision through the threaded mechanism's inherent precision.
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 faster, more accurate, and cost-effective setting and adjustment of bearing preload forces, reducing warranty costs and simplifying maintenance by allowing external access and adjustment without disassembling the differential carrier, thus improving operational efficiency and reliability.
Implementation Method 1
The threaded portion may mate with a threaded region of the housing
Implementation Method 2
The toothed portion may mesh with the drive gear of the adjuster element
Data Source
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AI summary
An axle assembly having a preload mechanism. The preload mechanism engages a bearing assembly and includes a preload element and an adjuster element. The preload element is disposed inside a housing and is rotatable about an axis. The adjuster element engages the preload element and is moveable to actuate the preload element and exert a preload force on a bearing assembly. The adjuster element is accessible from outside of the housing.