Axle Wheel End Axial Thrust Assembly Design
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Solution Overview
Problem
Existing solid axle assemblies for vehicles, such as Salisbury axles, face challenges in managing axial thrust loads, which can lead to increased wear and the need for additional retention mechanisms like C-Locks, as they primarily handle radial loads and rely on differential carrier bearings for axial load distribution.
Innovation Solution
The introduction of a wheel end axial thrust assembly that includes a radial bearing assembly, snap ring, thrust bearing assembly, and retainer nut with an annular groove and thrust cup, which effectively handles axial thrust forces by transferring them through a series of needle rollers and thrust washers, eliminating the need for C-Locks and enhancing load distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional wheel end bearings are used that only handle radial loads, then the bearing structure is simple, but axial thrust loads cause increased wear and require additional retention mechanisms
Solution Approach 1:
The patent combines radial and axial thrust bearing functions into a single integrated wheel end bearing assembly. The outer cup contains both radial load rollers and axial thrust needle rollers, eliminating the need for separate retention mechanisms like C-Locks and distributing both radial and axial loads through one unified structure.
Solution Approach 2:
The outer cup is designed to perform multiple functions simultaneously: it houses radial load rollers for radial load support, contains axial thrust needle rollers for axial thrust load handling, and provides structural mounting features. This multi-functional design eliminates the need for additional specialized components.
2Reliability
If C-Locks and cross shafts are used to handle axial loads, then axial thrust forces can be managed, but the overall assembly complexity and number of parts increases
Solution Approach 1:
The patent extracts the axial thrust load handling function from separate retention mechanisms (C-Locks and cross shafts) and integrates it directly into the wheel end bearing assembly through axial thrust needle rollers and thrust washers within the outer cup, eliminating the need for additional retention parts.
Solution Approach 2:
The patent merges the functions of C-Locks and cross shafts into the integrated outer cup design that contains axial thrust needle rollers. These rollers directly handle axial thrust forces that would otherwise require separate retention mechanisms, combining load management functions into one unified structure.
3Reliability
If separate radial and axial bearing assemblies are used, then load distribution is optimized, but the number of parts and assembly complexity increases
Solution Approach 1:
The patent merges separate radial and axial bearing assemblies into a single integrated outer cup structure that contains both radial load rollers and axial thrust needle rollers. This unified assembly maintains optimized load distribution for both radial and axial forces while reducing the total number of discrete components.
Solution Approach 2:
The outer cup is designed as a universal bearing assembly that simultaneously handles both radial and axial loads through its integrated roller configurations. The same structural component performs multiple bearing functions, eliminating the need for separate specialized bearing assemblies.
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 provides improved handling of axial thrust forces, reducing wear and the need for additional retention mechanisms, thereby enhancing the durability and performance of solid axle assemblies during vehicle operations.
Implementation Method 1
a radial bearing assembly including a plurality of needle rollers
Implementation Method 2
an oil seal press-fitted outboard of the wheel end bearing in the axle tube to maintain lubrication
Data Source
AI summary
An axle assembly for a vehicle including a differential assembly, a first axle tube extending outwardly from a first side of the differential assembly and defining an axle bore, a first axle shaft rotatably received in the first axle tube, and defining an annular groove extending radially inwardly from its outer surface, a retainer nut axially fixed to a distal end of the first axle tube, the retainer nut having an annular flange extending inwardly into the axle bore and defining an annular outer raceway, a snap ring received in the annular groove, and an axial thrust component disposed in the axle bore of the first axle tube between the snap ring and the outer raceway of the retainer nut.