Eccentric Planetary Traction Drive for Turbo Lag Reduction
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Solution Overview
Problem
Current turbochargers and superchargers face limitations in enhancing engine performance due to turbo lag and inefficiencies in torque transmission, which are not adequately addressed by existing technologies.
Innovation Solution
The development of an eccentric planetary traction drive super-turbocharger that utilizes a turbo shaft connected to a turbine and compressor, with support and loading planets and an outer ring to create a wedge gap, allowing translative movement of the loading planet to increase normal forces and torque capacity through shaft-support and loading planet interfaces, coupled with a transfer gear to the engine system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional turbocharger design is used, then结构简单性 is maintained, but torque transmission efficiency is insufficient causing turbo lag
Solution Approach 1:
The turbocharger is segmented into multiple functional modules: turbine assembly, compressor assembly, and an eccentric planetary traction drive system. The planetary system further divides torque transmission paths through multiple planet gears (support planets and loading planets) that independently engage with the turbo shaft, creating parallel torque transmission channels that improve efficiency while maintaining manageable structural complexity
Solution Approach 2:
The eccentric planetary traction drive acts as an intermediary mechanism between the turbine and compressor. The planet gears serve as mediators that transfer and amplify torque from the turbine shaft to the compressor, with the loading planets providing enhanced torque multiplication through their engagement with both the turbo shaft and outer ring, thereby reducing turbo lag
2Strength
If normal force at traction interface is increased, then torque capacity increases, but mechanical stress on components increases
Solution Approach 1:
The traction interfaces are designed with localized quality enhancements: the planet gears have specifically engineered contact surfaces with optimized curvature and material properties. The loading planets have larger diameter traction surfaces that distribute normal forces over greater areas, increasing torque capacity while managing stress concentrations through controlled local geometry rather than uniformly increasing forces throughout the system
Solution Approach 2:
The eccentric planetary system dynamically adjusts force distribution during operation. As the planets rotate through their orbits, the normal forces vary cyclically, with loading planets experiencing peak forces only during specific portions of their rotation when they are in the optimal position to transfer torque. This dynamic characteristic allows high torque capacity during power transmission while reducing average stress on components
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 design enhances torque capacity and rotational speed reduction, effectively eliminating turbo lag and improving engine performance by increasing normal forces and torque transmission efficiency.
Implementation Method 1
translative movement of the loading planet will force the loading planet into a smaller space between the outer ring and the turbo shaft and increase normal forces through the shaft-loading planet traction interface
Implementation Method 2
a first support planet outer traction surface that mates with the turbo shaft to form a first shaft-support planet traction interface that transfers torque between the turbo shaft and the first support planet
Implementation Method 3
a turbine connected to one end of the turbo shaft
Implementation Method 4
a compressor connected to an opposite end of the turbo shaft from the turbine
Data Source
AI summary
Disclosed are embodiments of eccentric planetary traction drives for use in a driven turbocharger. The eccentric planetary provides torque-based loading of the traction interfaces in the traction drive. A loading planet has a larger outer diameter and has translative movement when torque is applied to the traction drive so that it is forced into a wedge gap between the turbo shaft and outer ring of the planetary drive. The torque capacity of the traction drive increases with an increase of torque demand.