Segmented Friction Plate with Tapered Grooves for Clutch Cooling
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Solution Overview
Problem
Wet clutches in limited slip differential systems experience low cooling efficiency due to passive splash cooling methods, where it is difficult for sufficient oil to reach the clutch interface, leading to thermal degradation and reduced reliability.
Innovation Solution
A friction plate design with segmented friction material and tapered grooves that act as fluid paths to enhance oil flow and cooling, featuring a core plate with ears and a friction lining made of high-strength fibers and resin, optimized for alternating arrangement with separator plates to maximize cooling efficiency and load capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive splash cooling is used, then device complexity is reduced, but cooling efficiency deteriorates
Solution Approach 1:
The friction material is divided into multiple segments with grooves between them, creating channels for oil flow. This segmentation allows passive splash cooling to be more effective by providing dedicated pathways for cooling oil to reach the friction interface, resolving the contradiction between simple cooling system design and adequate cooling efficiency.
2Temperature
If forced cooling with oil channels is used, then cooling efficiency is improved, but device complexity increases
Solution Approach 1:
The grooves in the friction material segments serve dual purposes: they maintain the friction material structure and simultaneously function as self-contained cooling channels. The design eliminates the need for separate forced cooling systems with pumps and complex fluid channels, as the friction material itself provides the cooling pathways through its segmented structure.
3Ease of manufacture
If friction material is made as single piece, then manufacturing is simplified, but cooling efficiency deteriorates
Solution Approach 1:
The friction material is manufactured as multiple segments with grooves between them, creating inherent channels for oil flow. While this segmentation adds manufacturing steps compared to a single-piece design, it enables effective passive cooling by allowing oil to flow through the grooves to the friction interface, thereby resolving the contradiction between manufacturing simplicity and cooling efficiency.
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 improves cooling efficiency by directing oil flow through the grooves, reducing thermal degradation and maintaining clutch reliability under high sliding speeds and pressures, while maintaining sufficient load capacity and traction.
Implementation Method 1
A plurality of grooves are disposed between said plurality of friction segments, wherein each segment has tapered sides so that the grooves have a first width adjacent the first outer diameter and a second width, which is smaller than the first width, adjacent the inner diameter
Data Source
Figure 1
Figure 2A~2C
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AI summary
A friction plate for a clutch assembly includes a core plate and a plurality of friction segments made of a friction material. A plurality of grooves are disposed between said plurality of friction segments. Each segment has tapered sides so that the grooves have a first width adjacent the outer diameter of the core plate and a smaller second width smaller adjacent the inner diameter of the core plate. This tapered groove structure directs oil from the outside the clutch assembly to the inside to improve cooling efficiency.