Differential Thrust Washer Locking to Prevent Housing Wear
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Solution Overview
Problem
Conventional thrust washers in differentials experience wear and failure due to high forces and contamination, leading to housing malfunction, as they either rotate relative to the housing or have locking mechanisms that cause stress concentrations and friction increases.
Innovation Solution
A thrust washer design with an annular shape and engagement mechanisms, such as indentations or apertures, that lock to spider arms to prevent rotation relative to the housing, reducing wear by distributing torque forces and allowing debris flow through gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional thrust washers are designed to rotate relative to the housing, then friction is reduced, but wear increases due to contamination and fluid film issues
Solution Approach 1:
The thrust washer is divided into multiple segments or pieces that are arranged circumferentially. These segments can move independently relative to each other, allowing them to accommodate housing wear and contamination while maintaining low friction. The segmented design enables the washer to adapt to irregularities in the housing surface without requiring a complete rotation, thus reducing wear while maintaining low friction characteristics.
2Reliability
If locking tabs are added to prevent washer rotation, then wear is reduced, but stress concentrations and friction increase causing tab fracture
Solution Approach 1:
The invention removes the locking tabs entirely from the thrust washer design. Instead of using tabs that lock the washer to the housing, the design relies on the segmented structure and friction between segments to prevent rotation. This extraction of the locking tab element eliminates the stress concentration points and potential fracture locations while still achieving the goal of preventing washer rotation and reducing wear.
3Ease of manufacture
If the housing is made from softer material for manufacturability, then ease of manufacture improves, but wear resistance decreases under sliding action
Solution Approach 1:
The segmented thrust washer acts as an intermediary element between the softer housing and the spider gear. The multiple segments can adapt to the housing surface and distribute loads more evenly, reducing localized wear on the softer housing material. The segmented structure allows the washer to compensate for the lower wear resistance of the softer housing material while maintaining overall system reliability.
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
The design effectively prevents washer and housing wear by stabilizing the thrust washer, reducing friction, and facilitating debris removal, thereby enhancing differential longevity and reliability.
Implementation Method 1
configured to engage with the spider to prevent or reduce the thrust washer from rotating relative to the housing
Implementation Method 2
engagement mechanisms, such as indentations or apertures, that lock to spider arms to prevent rotation relative to the housing
Implementation Method 3
allowing debris flow through gaps
Data Source
Figure 1A~1D
Figure 2
Figure 3
AI summary
A thrust washer and a differential containing a thrust washer. The differential has a housing, a spider and one or more spider gears. The thrust washer includes a body having an annular shape and a width configured to approximately match with a width of the one or more spider gears. The thrust washer is further configured to engage with the spider to prevent or reduce the thrust washer from rotating relative to the housing when the thrust washer is installed in the differential.