Axle Preload Nut Locking Ring for Stable Bearing Preload
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Solution Overview
Problem
Existing axle assemblies with drive pinions and bearing preload elements face challenges in securely fixing the preload nut to prevent rotation, which can lead to inadequate bearing preload and increased maintenance costs due to the need for additional locking devices.
Innovation Solution
The axle assembly incorporates a deformable ring in the preload nut that engages a recess on the drive pinion's shaft, preventing the nut from rotating relative to the pinion, thus securing the preload nut without additional locking devices and allowing for easy installation and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional locking devices are used to secure the preload nut, then the preload nut can be fixed to prevent rotation, but the device complexity increases due to additional locking components
Solution Approach 1:
The deformable ring on the preload nut automatically engages with the drive pinion shaft to prevent rotation, eliminating the need for separate locking devices. The preload nut secures itself through the deformation and engagement of its own deformable ring feature with the recess in the drive pinion shaft.
Solution Approach 2:
The deformable ring changes its physical state from a flexible, deformable condition during installation to a rigid, engaged condition when locked into the recess of the drive pinion shaft. This parameter change from deformable to engaged state provides the locking function without requiring additional components.
2Reliability
If additional locking devices are used to secure the preload nut, then the preload nut can be fixed, but the manufacturing cost increases due to extra components
Solution Approach 1:
The locking function is merged into the preload nut itself through the deformable ring feature. Instead of being a separate component, the locking mechanism is integrated directly into the preload nut structure, reducing the total number of parts and associated manufacturing costs.
Solution Approach 2:
The deformable ring is designed as a simple, inexpensive feature that can be formed directly into the preload nut during manufacturing. This eliminates the need for expensive additional locking components while providing reliable fixation.
3Device complexity
If the preload nut is secured without additional locking devices, then the device complexity is reduced, but it becomes difficult to prevent rotation of the preload nut
Solution Approach 1:
The deformable ring and recess are designed with asymmetric geometries that allow easy installation in one direction but prevent rotation and removal in the opposite direction. The deformable ring deforms to pass through the recess during installation, then locks into place to prevent reverse motion.
Solution Approach 2:
The deformable ring is pre-configured with specific mechanical properties that allow it to deform during installation and then maintain its deformed state to provide locking. The preliminary design of the deformable ring's material properties and geometry ensures it can be installed easily but will prevent rotation once engaged.
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 ensures a consistent bearing preload, reduces friction and heating, improves bearing life, and minimizes maintenance costs by eliminating the need for extra locking components, while allowing for the reuse of the drive pinion.
Implementation Method 1
a deformable ring that is disposed proximate the threaded portion. The deformable ring may engage the shaft inside the recess to inhibit the preload nut from rotating about the axis with respect to the drive pinion
Data Source
AI summary
An axle assembly and method of assembly. The axle assembly may include a drive pinion and a preload nut. The drive pinion may have a recess. The preload nut may have a deformable ring. The deformable ring may engage the drive pinion inside the recess to inhibit rotation of the preload nut.