Clutch Ring Rim Structure for High-Torque Differential Engagement
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Solution Overview
Problem
Designs for vehicle driveline components with clutches face challenges in managing torque transfer efficiently while minimizing weight and size, particularly in requiring selective engagement and disengagement with varying torque requirements.
Innovation Solution
A clutch ring design featuring a main body with axially extending rim and teeth, where the rim extends farther from the rear face than the teeth, and a circumferentially continuous rim that overlaps the side gear in both engaged and disengaged positions, enhancing durability and allowing for efficient torque transfer while maintaining a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the clutch ring is designed with extended rim extending axially beyond the teeth, then stress concentrations are reduced and durability is enhanced, but the device complexity increases
Solution Approach 1:
The clutch ring is segmented into distinct functional zones: the main body containing teeth for engagement, and an extended rim portion that axially extends beyond the teeth. This segmentation allows the rim to serve as a separate stress-distributing element while the teeth handle torque transmission, resolving the contradiction by dividing the structure into specialized components.
Solution Approach 2:
The rim extends in the axial dimension beyond the teeth, creating a three-dimensional structure where the rim's axial extension provides additional surface area for stress distribution. This dimensional extension allows the clutch ring to handle higher torques without increasing radial or circumferential dimensions, thus improving durability without proportionally increasing overall device complexity.
2Force
If the rim extends axially beyond the teeth by up to five times the rim thickness, then the clutch can handle higher torque applications, but the length of the moving object increases
Solution Approach 1:
The axial extension of the rim is concentrated in the radial outer region of the clutch ring, where it is needed for stress distribution and torque handling. The main body and teeth maintain their compact dimensions for engagement purposes. This localized quality enhancement allows high torque capacity without uniformly increasing the clutch ring's axial length throughout the entire structure.
Solution Approach 2:
The clutch ring functions as a composite structure where the rim portion and the toothed body portion serve different mechanical functions. The extended rim acts as a stress-distributing flange while the teeth provide positive engagement, creating a functionally composite design that optimizes torque handling relative to axial length.
3Reliability
If the circumferentially continuous rim is used to overlap the side gear in both engaged and disengaged positions, then lubrication is improved and alignment is maintained, but the manufacturing precision requirements increase
Solution Approach 1:
The circumferentially continuous rim serves multiple functions simultaneously: it provides structural support, maintains coaxial alignment between the clutch ring and side gear, and creates a lubrication reservoir that overlaps the side gear in both engaged and disengaged positions. This multi-functionality reduces the need for separate alignment and lubrication features, thereby reducing overall manufacturing precision requirements despite the rim's complex geometry.
Data Source
AI summary
In at least some implementations, a clutch member includes a main body having a central axis, a radially inner surface, a radially outer surface, a rear face and a front face, multiple teeth formed in the front face with adjacent teeth circumferentially spaced apart, and a rim extending axially from the main body and located radially outwardly of the teeth. The rim extends axially farther from the rear face than do the teeth.