Friction Part Zig-Zag Groove Cooling Drag Torque
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Solution Overview
Problem
Conventional friction parts for multiplate clutches and brakes with zig-zag or undulating grooves suffer from severe wear, limited controllability, and high drag torque, especially at high rotational speeds, leading to potential fires and inefficient heat dissipation.
Innovation Solution
The friction part features a zig-zag or undulating encircling groove with additional second and third grooves that extend from the inner and outer edges to the deflection points, allowing for improved cooling and lubrication, reducing temperature-induced wear, and dynamic pressure to minimize drag torque, enhancing controllability and service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an encircling groove is provided in the friction surface for cooling and lubrication, then heat dissipation is improved, but the friction lining outside the groove suffers severe wear and may catch fire due to high temperature
Solution Approach 1:
The friction lining is divided into multiple segments separated by radial grooves, allowing the cooling medium to reach individual segments more effectively and distribute heat more evenly across the friction surface, preventing localized overheating and fire hazards
Solution Approach 2:
Different regions of the friction surface are given different groove patterns - the encircling groove provides general cooling while radial grooves provide localized cooling channels that ensure even the outer regions receive adequate cooling, creating locally optimized thermal management
2Temperature
If an encircling groove is provided in the friction surface, then cooling is improved, but drag torque increases due to the groove pattern
Solution Approach 1:
The groove pattern is designed to be dynamically optimized - the encircling groove with its specific geometry and the combination with radial grooves creates a flow pattern that reduces resistance to rotation while maintaining effective cooling, balancing thermal management with minimal energy loss
3Temperature
If an encircling groove is provided in the friction surface, then heat dissipation is improved, but controllability of the frictionally acting device is limited
Solution Approach 1:
Dividing the friction lining into segments via radial grooves creates distinct friction zones that can be independently managed, improving the distribution of friction forces and enhancing the controllability of the frictionally acting device while maintaining effective cooling
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 innovative groove pattern effectively cools both inner and outer regions of the friction surface, reduces drag torque, and improves the controllability of the frictionally acting device, leading to sustained performance and reduced wear, thereby extending the service life of the friction lining.
Implementation Method 1
a flow of a suitable cooling and lubricating medium, which is preferably oil... supply and discharge the cooling and lubricating medium in an expedient manner, grooves are often formed in the friction surface
Implementation Method 2
a dynamic pressure being generated at the outer deflection points, which dynamic pressure leads to a reduction of the drag torque
Implementation Method 3
the high temperatures generated on account of the friction surface contact during a shift process
Data Source
AI summary
A friction part for a frictionally acting device comprising an annular friction surface which has an inner edge and an outer edge, with the friction surface having provided in it an encircling first groove which extends in zig-zag or undulating form between radially inner and radially outer deflection points, a plurality of second grooves which extend from the inner edge to the outer deflection points and a plurality of third grooves which extend from the outer edge into the encircling first groove and which open into the encircling first groove at opening-in points between the deflection points.