Torsional Damper Additional Element Centrifugal Force Management
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Solution Overview
Problem
Existing torsional dampers in vehicle transmission systems experience wear and potential breakage due to centrifugal forces at high engine rotation speeds, particularly affecting the web and guide washers when springs come into contact with radially external edges, leading to reduced filtering performance.
Innovation Solution
A torsional damper design that incorporates an additional element with a projecting edge that comes into contact with the elastic return member under high centrifugal forces, redirecting these forces away from the input and output elements, thereby reducing wear and enhancing the structural integrity of the damper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If longer and wider springs are used to improve filtering performance, then filtering performance is improved, but centrifugal forces at high rotation speeds increase causing wear and potential breakage of web and guide washers
Solution Approach 1:
The patent introduces an additional element with a projecting edge that acts as an intermediary between the elastic return member and the radially external edge of the window. This additional element absorbs the centrifugal forces through its projecting edge, preventing direct contact between the elastic return member and the vulnerable radially external edge, thereby protecting the web and guide washers from wear and breakage while maintaining the filtering performance provided by the elastic return member
2Reliability
If springs are arranged along longer installation radii to improve filtering performance, then filtering performance is improved, but contact between springs and radially external edges of windows increases causing wear
Solution Approach 1:
The additional element with its projecting edge serves as a mediator that intercepts the elastic return member under centrifugal load. This positioning allows the additional element to bear the wear instead of the radially external edge of the window, protecting the web and guide washers from material loss while preserving the beneficial longer installation radius arrangement for filtering performance
3Force
If seats are added to absorb centrifugal forces, then some centrifugal force absorption is improved, but contact between springs and radially external edges of windows cannot be prevented above certain rotation speeds
Solution Approach 1:
The additional element with its projecting edge provides a more effective intermediary solution than seats alone. The projecting edge is specifically positioned to intercept the elastic return member when centrifugal forces become significant, creating a reliable contact point that prevents the elastic return member from reaching the radially external edge of the window, thereby ensuring protection at high rotation speeds
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 additional element effectively absorbs centrifugal forces, protecting the input and output elements from wear and improving the damper's centrifugal strength, ensuring continued filtering performance even at high engine rotation speeds.
Implementation Method 1
an elastic return member being capable of being received simultaneously in the window of the input element and in the window of the output element so as to generate a force acting against rotation of the output element with respect to the input element
Implementation Method 2
the springs generate a force acting against rotation of the guide washers of the disk with respect to a web of the disk. With a dimension and positioning of this kind, at high rotation speeds of the vehicle's engine the springs produce large centrifugal forces
Data Source
AI summary
A torsional damper for vehicle transmission systems comprises an input element rotationally movable around an axis and exhibiting at least one window comprising two angularly spaced lateral edges and a radially external edge. An output element is rotationally movable around the axis and exhibits at least one window comprising two angularly spaced lateral edges and a radially external edge. An elastic return member capable of being received simultaneously in the window of the input element and the window of the output element generates a force acting against rotation of the output element with respect to the input element. An additional element is rotationally movable around the axis and integral with one of the input element and output element. The additional element exhibits an edge comprising at least one region projecting radially into the window of the input element and output element with which the additional element is integral.