Axle Assembly Bearing Preload Adjustment via Lubricant Bore
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Solution Overview
Problem
Existing axle assembly technologies face issues with bearing preload adjustment, as they often require complex disassembly processes and lack lubrication, leading to premature bearing degradation and manufacturing delays.
Innovation Solution
An axle assembly design featuring a cover with a bearing adjuster that allows for preload adjustment through a lubricant bore, where the bearing adjuster is accessible for later stages of installation, reducing the likelihood of inaccurate preload and enhancing installation efficiency, and includes a lubricant seal spaced away from the adjuster to facilitate lubrication and prevent seal interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If bearing preload is adjusted using shims or internal adjusters, then bearing end play is reduced, but the disassembly process becomes convoluted and time-consuming
Solution Approach 1:
The bearing adjuster is pre-installed within the cover during cover manufacturing, positioned to be accessible after final assembly. This preliminary placement eliminates the need for complex disassembly operations later, as the adjuster is already in its optimal position for maintenance operations.
Solution Approach 2:
The patent introduces a dedicated bearing adjuster component as an intermediary element between the bearing and the cover. This adjuster can be accessed through the lubricant bore opening, serving as a mediator that enables preload adjustment without requiring disassembly of the main housing or bearing components.
2Manufacturing precision
If bearing adjuster is placed close to the bearing, then preload adjustment is effective, but the adjuster becomes inaccessible for later maintenance
Solution Approach 1:
The bearing adjuster is positioned in a different spatial dimension - accessible through the lubricant bore opening from the exterior of the cover, rather than requiring access from the bearing side. This dimensional change in accessibility allows maintenance operations without disassembling the main assembly while maintaining effective preload control.
Solution Approach 2:
The bearing adjuster is nested within the cover structure, positioned such that it is surrounded by the cover but accessible through the lubricant bore opening. This nesting arrangement allows the adjuster to be contained within the sealed environment while still being accessible for maintenance through the lubricant pathway.
3Reliability
If the bearing adjuster is sealed with the cover, then lubrication is maintained, but the adjuster cannot be accessed for preload adjustment
Solution Approach 1:
The bearing adjuster is extracted from the fully sealed interior of the cover and positioned to be accessible through the lubricant bore opening. This extraction allows the adjuster to remain functionally integrated with the sealed lubrication system while being accessible for maintenance operations through the lubricant pathway.
4Adaptability or versatility
If bearing preload is adjusted after assembly, then manufacturing flexibility is improved, but the process becomes more complex
Solution Approach 1:
The bearing adjuster is pre-positioned within the cover during manufacturing, but the actual preload adjustment is deferred to a later stage when the assembly is complete. This preliminary positioning simplifies the final adjustment process, as the adjuster is already in place and only requires simple access through the lubricant bore opening.
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 design reduces the complexity and duration of bearing preload adjustment, increases bearing longevity, and enhances manufacturing efficiency by allowing for precise preload adjustment without disassembling the cover, while also reducing the risk of lubricant leaks and seal wear.
Implementation Method 1
a lubricant seal spaced axially away from the bearing adjuster and sealing a lubricant bore
Implementation Method 2
a bearing adjuster configured to set bearing preload or end play
Data Source
AI summary
A method and system for an axle assembly are provided. The axle assembly, in one example, includes a cover at least partially circumferentially surrounding a shaft, a bearing coupled to the shaft and the cover, the bearing including an outer race, and a bearing adjuster including a first axial side adjacent to the outer race and configured to set a bearing preload and/or end play. The assembly further includes a lubricant seal spaced axially away from the bearing adjuster and sealing a lubricant bore and the lubricant bore traverses the cover and extends axially toward the bearing adjuster.