Planetary Traction Drive Fluid Damping for Turbocharger Vibration
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Solution Overview
Problem
Driven turbochargers face challenges in effectively managing vibrations and dissipating kinetic energy, leading to inefficiencies and potential damage within the planetary traction drive system.
Innovation Solution
The implementation of a fluid damping system comprising radial and axial squeeze film dampers, integrated with double-roller planets and a ring roller, which absorbs vibrations and dissipates kinetic energy through a network of fluid supply and feed holes, ensuring effective damping and energy dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a planetary traction drive is used in driven turbochargers, then torque transmission and turbo-lag reduction are improved, but vibrations and kinetic energy dissipation become problematic
Solution Approach 1:
A fluid damping system is introduced as an intermediary between the planetary traction drive components. The system uses a damping fluid circulated through feed holes to the squeeze film dampers, which act as a mediator to absorb vibrations and dissipate kinetic energy while allowing the planetary drive to continue transmitting torque effectively
Solution Approach 2:
The patent employs hydraulic principles by using a fluid damping system where damping fluid is supplied through feed holes to radial and axial squeeze film dampers. The fluid creates a squeeze film that dissipates kinetic energy and reduces vibrations through hydraulic damping effects, resolving the contradiction between power transmission and vibration control
2Reliability
If conventional bearings are used in planet bearings, then support for double-roller planets is provided, but vibrations and kinetic energy are not effectively dissipated
Solution Approach 1:
The patent merges the bearing support function with the vibration damping function by integrating squeeze film dampers with the planet bearing structure. The radial and axial squeeze film dampers are combined with the bearing assembly, allowing a single integrated system to provide both reliable planet support and effective kinetic energy dissipation
Solution Approach 2:
The patent changes the physical parameters of the bearing system by introducing fluid damping characteristics. The damping fluid's viscosity and the squeeze film geometry are optimized to convert mechanical kinetic energy into thermal energy through viscous dissipation, thereby effectively dissipating vibrations while maintaining reliable planet bearing support
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 solution significantly reduces vibrations and dissipates kinetic energy, enhancing the stability and efficiency of the planetary traction drive, thereby improving the performance and longevity of the driven turbocharger.
Implementation Method 1
a radial squeeze film damper that absorbs vibrations and dissipates kinetic energy from the planetary traction drive; an axial squeeze film damper that absorbs vibrations and dissipates kinetic energy from the planetary traction drive
Data Source
AI summary
Disclosed is a fluid damping system for a planetary traction drive designed for a driven turbocharger on an engine. The planetary traction drive has a plurality of double roller planets that are each supported by two planet hearings, one at each end of the double roller planet. Each planet bearing has a fluid damping system that consists of a radial squeeze film damper that feeds fluid to an axial squeeze film damper to absorb vibrations and dissipate kinetic energy in the planetary traction drive.