Axle Preload Mechanism for External Bearing Force Adjustment
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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
A preload mechanism that includes a rotatable preload element and an adjuster element, accessible from outside the housing, allows for the external adjustment of bearing preload forces by rotating the adjuster element to interact with the preload element, thereby modifying the bearing preload force without disassembly, using a retainer to inhibit axial movement and a toothed portion to mesh with a drive gear for precise control.
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 installation variances and component tolerances
Solution Approach 1:
The patent replaces the traditional mechanical shim-based preload setting system with a threaded adjuster mechanism. The adjuster element engages with the preload element through threads, allowing precise axial positioning and preload adjustment without shims. This mechanical substitution eliminates installation variances and component tolerances associated with shims, 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 axial position of the preload element along the shaft axis via threaded engagement, the 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 disassembly is required to access preload elements, then internal preload adjustment is possible, but productivity and ease of operation worsen due to increased complexity and time requirements
Solution Approach 1:
The patent extracts the adjuster element and preload adjustment mechanism from the internal housing structure and makes them externally accessible. The adjuster element is positioned such that it can be accessed from outside the housing through an opening, allowing operators to adjust preload forces without disassembling the housing or other internal components. This extraction and external positioning significantly improves ease of operation and productivity.
Solution Approach 2:
The patent designs the adjuster element to be self-contained and externally accessible, allowing the preload mechanism to serve itself without requiring disassembly of the housing. The adjuster element can be directly manipulated from outside the housing to adjust the preload force on the bearing assembly, enabling maintenance and adjustment operations to be performed quickly and easily without specialized disassembly procedures.
3Manufacturing precision
If precise axial positioning is required for bearing preload, then manufacturing complexity increases, but ease of manufacture deteriorates due to tighter tolerances and more complex assembly procedures
Solution Approach 1:
The patent replaces complex precision positioning mechanisms with a simple threaded adjuster system. Instead of requiring precision-machined positioning features and tight tolerances in the housing and bearing supports, the invention uses a threaded adjuster element that can be rotated to precisely position the preload element axially. This substitution dramatically simplifies manufacturing while maintaining high positioning accuracy, as the precision is achieved through the adjustable threaded mechanism rather than through tight manufacturing tolerances.
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 faster, more accurate, and less invasive setting and adjustment of bearing preload forces, reducing the need for shims and minimizing rework costs, while accommodating variances from component installation or removal, such as yoke replacement or nut tightening, thus improving operational efficiency and reducing warranty expenses.
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
Implementation Method 3
The retainer may engage an end of the adjuster element when the retainer is received in the hole in the housing
Data Source
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.