Drive Pinion Preload Nut Assembly for Independent Bearing Setting
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Solution Overview
Problem
Existing axle assemblies face challenges in accurately setting and maintaining bearing preload forces independently of yoke installation, which can affect the integrity of the seal and bearing performance.
Innovation Solution
The axle assembly incorporates a preload nut with a threaded portion that mates with the drive pinion shaft, a seal assembly that encircles the preload nut and extends to the differential carrier, and retaining features on the yoke to inhibit movement, allowing for independent setting of bearing preload forces and ensuring sealing integrity regardless of yoke installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the preload nut is integrated with the yoke assembly, then the bearing preload can be set during yoke installation, but the seal assembly integrity is compromised and bearing performance is affected
Solution Approach 1:
The invention separates the preload nut from the yoke assembly into independent components. The preload nut threads onto the drive pinion shaft independently, allowing bearing preload to be set separately from yoke installation. This segmentation prevents the seal assembly from being compromised during preload adjustment, as the seal remains intact between the differential carrier and yoke while the preload nut operates independently on the shaft.
2Reliability
If the preload nut is separated from the yoke assembly, then the seal assembly integrity is maintained, but the complexity of assembly increases
Solution Approach 1:
While the preload nut is separated from the yoke assembly, the invention merges the preload adjustment function directly into the drive pinion shaft through threaded portions. This integration of the preload mechanism into the existing shaft structure, rather than adding separate complex adjustment mechanisms, maintains simplicity while preserving seal assembly integrity.
3Manufacturing precision
If the seal assembly extends to the yoke, then sealing coverage is maximized, but the preload force setting is affected by yoke installation variations
Solution Approach 1:
The invention extracts the preload force application point from the yoke assembly interface and relocates it to the drive pinion shaft through the threaded preload nut. This allows the seal assembly to extend to the yoke for maximum sealing coverage while the preload force is independently controlled through the shaft threads, eliminating the coupling between yoke installation variations and preload force accuracy.
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 configuration enables precise and accurate setting of bearing preload forces without affecting the seal assembly, enhancing the durability and reliability of the axle assembly by decoupling the preload force from yoke installation and ensuring consistent sealing performance.
Implementation Method 1
The preload nut has a thread that mates with the threaded portion of the shaft
Implementation Method 2
The seal assembly encircles the preload nut. The seal assembly extends from the preload nut to the differential carrier
Implementation Method 3
The bearing assembly encircles the shaft and rotatably supports the drive pinion on the differential carrier
Data Source
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AI summary
An axle assembly having a differential carrier, a drive pinion, a bearing assembly, and a preload nut. The drive pinion has a shaft that has a threaded portion. The bearing assembly rotatably supports the drive pinion on the differential carrier. The preload nut mates with the threaded portion and exerts a preload force on the bearing assembly.