Friction Plate with Localized Resin Absorption for Clutch Separation
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Solution Overview
Problem
Existing friction plates with raised resilient first friction lining portions are complex to manufacture and result in high drag torque and impaired friction behavior in multiplate clutches and brakes, making it difficult to achieve reliable separation and set resilience effectively.
Innovation Solution
A friction plate design featuring a friction lining carrier with paper friction linings having distinct resin absorption levels between first and second friction lining portions, where the first portion is more resilient and raised, allowing for controlled separation and reduced drag torque, manufactured using a method that simplifies the production process by varying resin absorption and paper density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first friction lining portions are made distinctly more resilient and raised relative to the second friction lining portions, then the separation of friction and steel plates is improved in the disengaged state, but the manufacturing complexity increases and drag torque remains relatively high
Solution Approach 1:
The patent applies local quality by creating distinct regions within the friction lining with different resin absorption properties. The first friction lining portions have lower resin absorption (20-40%) making them more resilient, while the second portions have higher resin absorption (40-60%) making them less resilient. This local differentiation enables reliable plate separation through the more resilient first portions while maintaining good friction behavior through the less resilient second portions, and simplifies manufacturing by using a single molding process with varied resin distribution.
2Reliability
If the first friction lining portions are made distinctly more resilient and raised, then plate separation is enhanced, but the friction behavior is negatively influenced and drag torque increases
Solution Approach 1:
The patent reduces drag torque by implementing local quality differentiation where only the first friction lining portions (with lower resin absorption and higher resilience) are raised relative to the second friction lining portions. This localized raising ensures that the more resilient material is positioned to facilitate plate separation without causing excessive drag torque across the entire friction surface. The second portions remain lower and maintain good friction behavior.
Solution Approach 2:
The patent changes the resin absorption parameter to control resilience and friction characteristics. By setting resin absorption in the first friction lining portions at 20-40% and in the second portions at 40-60%, the invention optimizes the balance between plate separation capability and friction behavior. This parameter control also limits the height difference between raised and non-raised portions to 0.01-0.06 mm, further optimizing the trade-off between separation and drag torque.
3Ease of manufacture
If resin absorption is varied between first and second friction lining portions to control resilience, then manufacturing is simplified, but the manufacturing precision requirements increase
Solution Approach 1:
The patent simplifies manufacturing by changing the resin absorption parameter during the molding process itself, rather than requiring separate processing steps. The resin absorption in the first friction lining portions is controlled at 20-40% and in the second portions at 40-60% through the molding process, which integrates the resilience differentiation into a single manufacturing step. This approach maintains manufacturing simplicity while establishing clear parameter ranges to guide production control.
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 solution enables a friction plate that is simple to manufacture, exhibits good friction behavior, and achieves reliable separation with reduced drag torque in the disengaged state of multiplate clutches and brakes, while maintaining durability and heat resistance.
Implementation Method 1
the first friction lining portion exhibits a lower resin absorption than the second friction lining portion of the paper friction lining
Data Source
AI summary
A friction plate (2) with a friction lining carrier (18) and a paper friction lining (24) arranged on one side of the friction lining carrier (18) to form a friction surface, which comprises at least one first friction lining portion (32) and at least one second friction lining portion (34), the friction surface (36) in the first friction lining portion (32) being raised relative to the friction surface (38) in the second friction lining portion (34). The first friction lining portion (32) exhibits a lower resin absorption than the second friction lining portion (34). The invention furthermore relates to a method for producing such a friction plate (2) and to a wet-running multiplate clutch or brake comprising such a friction plate (2).