Clutch Pack Wear Liners and Thin Friction Disks
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Solution Overview
Problem
Existing multi-plate clutch systems face issues with excessive spring force, clutch fade due to heat expansion, and increased parasitic drag, which lead to operator fatigue and wear on the clutch basket, particularly when using steel friction plates with aluminum baskets.
Innovation Solution
The introduction of liners in the clutch basket slots and improved driving friction disks with narrowed tabs and optimized friction pads to increase the number of clutch disks, reduce spring force, and enhance thermal properties, while maintaining the same overall height and preventing accelerated wear on the clutch basket.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the number of friction plates is increased to reduce spring force and operator effort, then the torque transfer capability is improved, but the overall height of the clutch pack increases
Solution Approach 1:
The patent changes the thickness parameter of friction plates from conventional dimensions to thinner specifications (e.g., 1.8mm instead of 3mm), allowing more plates to be stacked within the same overall height constraint while maintaining or improving torque transfer capability and reducing spring force requirements
Solution Approach 2:
The patent addresses the height constraint by optimizing the radial and axial dimensions of friction plates, using narrower tabs and optimized friction pad dimensions to accommodate more plates in the radial direction while controlling overall height through precise dimensional control in the axial direction
2Temperature
If steel friction plates are used to improve thermal properties and reduce clutch fade, then heat resistance is improved, but wear on the aluminum clutch basket is accelerated
Solution Approach 1:
The patent introduces wear-resistant liners as intermediary components between the steel friction plates and the aluminum clutch basket. These liners act as a protective mediator that prevents direct contact between the hard steel plates and the softer aluminum basket, thereby reducing wear on the basket while allowing the steel plates to maintain their superior thermal properties
Solution Approach 2:
The patent employs composite construction by combining steel friction plates with wear-resistant liner materials, creating a hybrid system that leverages the high thermal conductivity and heat resistance of steel while incorporating the wear protection properties of specialized liner materials to protect the aluminum clutch basket
3Power
If more clutch disks are added to increase torque capacity, then the torque transfer capability is improved, but parasitic drag increases
Solution Approach 1:
The patent optimizes parameters such as friction pad surface area, tab dimensions, and disk spacing to minimize parasitic drag while maintaining adequate torque capacity. By carefully controlling these parameters, the system achieves high torque transfer with reduced energy loss during engagement and disengagement cycles
Solution Approach 2:
The patent uses optimized friction pad dimensions and spacing that provide sufficient friction surface area for torque transfer without excessive contact area that would increase parasitic drag. The design achieves the minimum necessary friction surface for effective torque transfer while minimizing energy loss
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
This configuration reduces operator effort, minimizes clutch fade, and decreases parasitic drag by improving lubrication and wear resistance, allowing for a higher torque capacity without increasing the clutch basket's weight or cost.
Implementation Method 1
The clutch pack is compressed, the clutch input and clutch output become rotationally coupled... When the clutch pack is compressed, the clutch input and clutch output become rotationally coupled
Implementation Method 2
the pressure plate; the pressure plate typically providing a compressive force via a spring mechanism
Implementation Method 3
providing a compressive force via a spring mechanism or through a centrifugally actuated mechanism
Data Source
AI summary
An improved clutch pack is disclosed. The clutch pack incorporates liners, improved driving friction disks and driven disks where the thickness of the improved driving friction disks and driven disks are selected in order to allow more driving friction disks and more driven disks to be used within the improved clutch pack while maintaining approximately the same overall height as compared to the standard clutch pack the vehicles clutch system was designed for.