Exhaust Assembly Expansion Chamber Choke Plate
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Solution Overview
Problem
Vehicles with fuel-burning engines face challenges in safely expelling exhaust gas, as high temperatures can damage the vehicle's tires and fairing, and existing methods either cause overheating or paint discoloration.
Innovation Solution
An exhaust assembly featuring an expansion chamber with a larger second opening than the first, a choke plate covering at least 10% of the second opening, and a thermal barrier, which reduces heat transfer to the fairing by expanding the exhaust gas and directing it in a cone-like shape at higher velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If exhaust gas is expelled under the chassis, then exhaust gas is effectively removed from the vehicle, but temperature in tires and temperature-sensitive components under the chassis rises to unsafe levels
Solution Approach 1:
The expansion chamber acts as an intermediary between the exhaust pipe and the exhaust opening in the fairing. It receives hot exhaust gas from the engine and controls its expansion and discharge, preventing direct contact with temperature-sensitive components while maintaining effective exhaust removal.
2Productivity
If exhaust gas is expelled through an exhaust opening in the exterior fairing, then exhaust gas is effectively removed from the vehicle, but heat from the exhaust gas damages the fairing and causes paint discoloration
Solution Approach 1:
The expansion chamber changes the parameters of the exhaust gas flow by increasing its volume and allowing it to expand. This expansion reduces the concentration of heat and allows the exhaust gas to cool before discharge through the fairing opening, preventing damage to the fairing and paint.
3Productivity
If the cross-sectional area of the exhaust opening is increased, then exhaust gas expulsion efficiency is improved, but heat transfer to the fairing increases causing more damage
Solution Approach 1:
The expansion chamber serves as a mediator that allows the exhaust gas to expand and cool before reaching the fairing. This enables the use of a larger exhaust opening for efficient gas expulsion while the expansion chamber prevents excessive heat transfer to the fairing by providing a buffer volume.
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
Effectively reduces heat transfer to the fairing, preventing damage and discoloration while maintaining a nozzle effect for efficient exhaust expulsion.
Implementation Method 1
an expansion chamber having a first opening fluidly coupled to the exhaust pipe and a second opening aligned with the exhaust opening in the fairing
Implementation Method 2
the exhaust assembly further includes a thermal barrier between the choke plate and the expansion chamber
Data Source
AI summary
A vehicle includes: an engine; an exhaust pipe, fluidly coupled to the engine; a vehicle body including a fairing having an exhaust opening; and an exhaust assembly, the exhaust assembly including: an expansion chamber having a first opening fluidly coupled to the exhaust pipe and a second opening aligned with the exhaust opening in the fairing, a cross-sectional area of the second opening being greater than a cross-sectional area of the first opening, and a choke plate attached to the expansion chamber and shaped and sized to cover at least ten percent of the cross-sectional area of the second opening.