Monolithic Pulley-Hub Torsional Vibration Damper
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Solution Overview
Problem
Existing torsional vibration dampers are not designed to address the complexities introduced by start-stop systems in vehicle engines, such as potential slip in the elastomer-metal interface and maintenance of axial and radial run-outs, leading to potential crankshaft failure due to uncontrolled vibrations.
Innovation Solution
A direct drive torsional vibration damper with a pulley body-hub monolithic member and inertia members, featuring elastomeric members that reduce slip and enhance run-outs, allowing for reduced angular vibrations transmission and easier assembly, utilizing a monolithic pulley body-hub design with elastomeric members and inertia members to absorb vibrations directly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex multi-component dampers are used, then vibration absorption is improved, but assembly and disassembly become difficult
Solution Approach 1:
The patent merges the pulley body and hub into a single monolithic component, eliminating the need for separate assembly of these parts. This integration maintains vibration absorption capabilities while significantly simplifying assembly and disassembly operations.
Solution Approach 2:
The monolithic pulley body-hub design serves multiple functions simultaneously: it provides the structural pulley function, acts as the hub for belt engagement, and integrates the magnet embedding for vibration damping. This multi-functionality reduces the number of separate components needed.
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 significantly reduces angular vibrations transmitted to the FEAD system by up to a factor of 10, improves axial and radial run-outs, and simplifies assembly and disassembly, effectively addressing the limitations of existing dampers in start-stop scenarios.
Implementation Method 1
first and second elastomeric members (204, 206)... to dampen and/or absorb the vibrational frequencies
Implementation Method 2
The solution significantly reduces angular vibrations transmitted to the FEAD system by up to a factor of 10
Implementation Method 3
one or more inertia members (108, 110)... to counteracting torque to the crank negating the torque twisting amplitude
Data Source
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AI summary
Torsional vibration dampers having a hub integral with a pulley body for rotation therewith and at least an annular first elastomeric member seated on the pulley body between the outer belt engaging surface and the hub and held thereagainst for rotation therewith by a first inertia ring connected to the pulley body are disclosed. The torsional vibration dampers may also include an annular second elastomeric member seated on the pulley body, on a side opposite the annular first elastomeric member, between the outer belt engaging surface and the hub and held thereagainst for rotation therewith by a second inertia ring connected to the pulley body or seated on the first inertia member, on a side opposite the first elastomeric member, between the first inertia member and a front end cap, where the front end cap compresses the second elastomeric member against the first inertia member.