Tolerance Ring Recess Structure for Wear Debris Discharge
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Solution Overview
Problem
Wear debris accumulation between the tolerance ring and the shaft or sleeve leads to increased wear and reduced torque capacity in torque limiters, as the debris gets caught during slip rotation and further wears the components.
Innovation Solution
A tolerance ring design featuring protuberances with recesses, grooves, or notches that allow lubricant to flow in and out, effectively discharging wear debris from the protuberances, reducing accumulation and wear, and incorporating manganese phosphate coating for enhanced wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protuberances are provided on the tolerance ring to store lubricant, then wear caused by slip rotation is reduced, but wear debris accumulates inside the protuberances leading to increased wear
Solution Approach 1:
The patent divides the protuberance structure into multiple functional zones by introducing grooves that extend from the end surface to the inner circumferential surface. This segmentation creates distinct lubricant storage regions and debris discharge pathways, allowing the protuberance to simultaneously maintain lubrication while preventing debris accumulation that would otherwise increase wear
Solution Approach 2:
The patent extracts the harmful wear debris from the lubricant storage function by providing grooves that communicate with the exterior. This allows debris to be separated and discharged from the lubricant-filled spaces, preventing the accumulation that would convert the beneficial lubricant storage function into a harmful debris trap
2Ease of manufacture
If the tolerance ring structure is simplified without protuberances, then manufacturing is easier, but wear resistance is reduced
Solution Approach 1:
The patent applies local quality by providing grooves only in specific regions of the protuberances where debris accumulation occurs most severely. This localized modification maintains the overall simple cylindrical structure for ease of manufacture while adding wear protection functionality only where needed, rather than complicating the entire structure
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 wear debris accumulation, reducing further wear and maintaining the torque limit within acceptable values by facilitating the discharge of debris through the recesses or notches, while the manganese phosphate coating further suppresses wear.
Implementation Method 1
The main body includes a recess that extends from an end of the main body to at least one of the protuberances and communicates with an inside of the at least one of the protuberances
Implementation Method 2
incorporating manganese phosphate coating for enhanced wear resistance
Data Source
AI summary
A tolerance ring includes a cylindrical main body, which has an inner circumferential surface and an outer circumferential surface, and a plurality of protuberances, which protrudes outward in a radial direction from the inner circumferential surface of the main body. The main body includes a recess that extends from an end of the main body to at least one of the protuberances and communicates with an inside of the at least one of the protuberances.