Friction Engagement Element with Aged Layer and Recessed Metal Surface
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Solution Overview
Problem
Devices using friction engagement elements experience unstable torque transmission and significant torque fluctuations, leading to reduced lifespan and noise issues due to the interaction between resin-based friction members and metal components.
Innovation Solution
A friction engagement element comprising a resin friction member with an aged layer and a hardened layer, where the metal member's sliding surface features recesses that trap a transferred film of the aged layer, enhancing frictional stability and torque consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a resin friction member is used for torque transmission, then the friction engagement element can provide adequate frictional contact, but torque transmission becomes unstable and torque fluctuations occur in certain rotation and torque ranges
Solution Approach 1:
The friction member is designed with non-uniform hardness distribution through the thickness direction, with a harder layer at the friction surface and a softer layer at the back surface. This local quality variation allows the friction surface to maintain stable torque transmission while the softer back surface provides flexibility and damping, preventing torque fluctuations in certain rotation ranges.
Solution Approach 2:
The friction member is constructed as a composite structure with multiple layers of different materials or material states. The aged layer with higher hardness is combined with the base resin layer with lower hardness, creating a composite material structure that simultaneously provides stable frictional contact and dampens torque fluctuations, resolving the contradiction between friction adequacy and torque stability.
2Duration of action of stationary object
If the friction member surface is hardened to improve wear resistance, then the lifespan increases, but the torque transmission stability deteriorates due to increased torque fluctuations
Solution Approach 1:
The friction member implements local quality differentiation by positioning the hardened aged layer only at the friction surface where wear resistance is needed, while maintaining a softer structure at the back surface. This localized hardening provides wear resistance for extended lifespan without the excessive hardness that would cause torque fluctuations, thus resolving the contradiction between lifespan and torque stability.
Solution Approach 2:
The friction member is segmented into distinct layers with different properties: a hardened aged layer at the friction surface for wear resistance and a softer base layer for flexibility. This segmentation allows each layer to perform its specific function independently, achieving both extended lifespan through surface hardening and torque stability through the compliant back layer.
3Ease of manufacture
If a simple resin structure is used for the friction member, then the manufacturing is easier, but the friction member lacks the layered structure needed for stable torque transmission
Solution Approach 1:
The aged layer is formed through a preliminary aging treatment process applied to the resin friction member before final assembly. This preliminary action creates the necessary hardened surface layer with controlled thickness and properties, enabling stable torque transmission without requiring complex multi-step manufacturing processes or assembly of multiple components.
Solution Approach 2:
The manufacturing process utilizes parameter changes in the resin material through thermal or chemical aging treatment to transform the simple resin structure into a layered structure with differentiated hardness. By controlling aging parameters such as temperature, time, and atmosphere, the desired aged layer is formed directly on the resin substrate, achieving complex functionality from a simple starting material.
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 stabilizes torque transmission by forming a transferred film on the metal member's surface, reducing torque fluctuations and extending the lifespan of the friction member through improved frictional contact and wear resistance.
Implementation Method 1
a transferred film of the aged layer of the friction member transferred and adhered to the inside of the recesses through the sliding between the friction member and the metal member
Data Source
AI summary
A friction engagement element has a friction member including resin, and a metal member having a sliding surface slidable on the friction member. The friction member has an aged layer at an outermost layer of the friction member, and a hardened layer in abutment with an inner side of the aged layer in a thickness direction of the friction member. The sliding surface of the metal member has a plurality of recesses, and a transferred film of the aged layer of the friction member transferred and adhered to insides of the plurality of recesses through sliding between the friction member and the metal member.