Dual-Shear Crankshaft Damper Cooling for High-Temperature Operation
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Solution Overview
Problem
Elastomeric crankshaft dampers face limitations in high-temperature applications due to the operating temperature limits of current materials, necessitating improved heat dissipation mechanisms to effectively manage heat generated by torsional deflections in combustion engines.
Innovation Solution
A dual shear disk crankshaft damper design featuring an inertia ring with radially extending grooves and cooling channels, along with a cup and case structure that enhances heat transfer and cooling, is introduced. This design includes an elastomeric ring with V-shaped notches and multiple inertia rings to increase mass and facilitate direct heat transfer and cooling, potentially exceeding the temperature limits of existing elastomers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high temperature resistant elastomers are used, then the temperature limit is increased, but the heat dissipation capability is insufficient for applications exceeding the temperature limit
Solution Approach 1:
The elastomeric damping member is segmented into multiple discrete elastomeric segments arranged circumferentially around the crankshaft. This segmentation creates multiple independent heat dissipation zones and allows for better thermal management across the entire damping member, addressing the insufficient heat dissipation capability while maintaining high temperature resistance
Solution Approach 2:
Cooling channels are introduced as intermediary structures that facilitate heat transfer from the elastomeric damping member to the surrounding environment. These channels act as thermal mediators, enabling applications to exceed the temperature limits of existing elastomers by actively managing heat dissipation
2Loss of energy
If the elastomeric member is designed for high heat dissipation, then the temperature limit can be exceeded, but the structural integrity and damping performance may be compromised
Solution Approach 1:
The damping member is divided into multiple elastomeric segments that maintain structural integrity through their collective arrangement. Each segment can be optimized for heat dissipation while the overall segmented structure preserves the necessary mechanical strength and damping performance
Solution Approach 2:
Different regions of the elastomeric damping member have different properties - the outer surfaces and regions adjacent to cooling channels are optimized for heat dissipation, while the inner regions maintain the structural integrity and damping characteristics necessary for crankshaft application
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 dual shear disk crankshaft damper effectively enhances heat dissipation and cooling, potentially extending the operational temperature range beyond current limits, thereby improving the durability and performance of crankshaft dampers in high-temperature environments.
Implementation Method 1
Vibrations of the crankshaft are damped by torsional shearing of the elastomeric member relative to the inertia ring
Implementation Method 2
converting torsional deflections into heat which reduces the crankshaft torsional deflections
Implementation Method 3
The cooling channels may be oblong in shape. The openings in the cup may be circular
Implementation Method 4
A cup includes an annular radially extending leg and an annular axially extending leg
Implementation Method 5
The inertia of the inertia ring and the torsional spring rate of the elastomeric member are selected to provide a specific natural frequency
Data Source
AI summary
A dual shear disk crankshaft damper having an inertia ring includes a disk, an elastomeric ring receives the outer portion of the disk, an inertia ring defines an annular recess disposed on a first radially extending side of the elastomeric ring, and a cup that includes an annular radially extending leg and an annular axially extending leg. The cup includes a rim that is received in the annular recess. In an alternative embodiment, a dual shear disk crankshaft damper includes a first inertia ring and a second inertia ring, an elastomeric ring, first and second inertia rings, and a tubular case disposed on a radially outer surface of the elastomeric ring and a radially outer surface of the first and second inertia rings.