US4143731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust flow directional device
Assignee: Motors Liquidation Co
•
Filing: 1977-12-22
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Granted: 1979-03-13
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Expires: 1997-12-22
Abstract
Abstract An airfoil is mounted on the exhaust pipe of a tractor trailer vehicle generally forward the exhaust pipe opening so as to be upstream of the exhaust pipe in the airflow deflected by a drag reducer mounted on the tractor roof forward the exhaust pipe. The airfoil splits the deflected airflow around the exhaust pipe. The airfoil has a pervious portion located generally below the exhaust pipe opening to allow airflow therethrough to prevent a low pressure buildup in the area generally below the exhaust pipe opening. The airfoil also has an airflow impervious portion located generally above the exhaust pipe opening to create a low pressure behind the impervious portion and generally above the exhaust opening to thereby draw the exhaust flow upwardly into the deflected airflow.
Inventors
- 👤 Norman E. Haustein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:30
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/08; F01N13/082; F01N13/085; F01N2590/00; F01N2590/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
140 words
In a tractor having a roof mounted air deflector and an engine exhaust pipe located behind the air deflector and having an opening discharging engine exhaust into the deflected airflow, an exhaust flow directional device comprising: a semicylindrical airfoil, means mounting the airfoil on the exhaust pipe adjacent the exhaust pipe opening and in the deflected airflow upstream of the exhaust pipe opening to split the deflected airflow around the exhaust pipe, said airfoil having a semicylindrical pervious portion located generally below the exhaust pipe opening allowing airflow therethrough to prevent low pressure behind the pervious portion of the airfoil and a semicylindrical impervious portion located generally above the exhaust pipe opening to create a low pressure behind the impervious portion of the airfoil and above the exhaust opening to thereby draw the exhaust flow upwardly into the deflected airflow.
Claim 2
Dependent Claim
140 words
In a tractor having a roof mounted air deflector and an engine exhaust pipe located behind the air deflector and having an opening discharging engine exhaust into the deflected airflow, an exhaust flow directional device comprising: a semicylindrical airfoil, means mounting the airfoil on the exhaust pipe adjacent the exhaust pipe opening and in the deflected airflow upstream of the exhaust pipe opening to split the deflected airflow around the exhaust pipe, said airfoil having a semicylindrical pervious portion located generally below the exhaust pipe opening allowing airflow therethrough to prevent low pressure behind the pervious portion of the airfoil and a semicylindrical impervious portion located generally above the exhaust pipe opening to create a low pressure behind the impervious portion of the airfoil and above the exhaust opening to thereby draw the exhaust flow upwardly into the deflected airflow.
Claim 3
Dependent Claim
159 words
In a tractor having a roof mounted air deflector and an engine exhaust pipe located behind the air deflector and having an opening discharging engine exhaust into the deflected airflow, an exhaust flow directional device comprising: an airfoil having a semicylindrical wall, means mounting the airfoil on the exhaust pipe adjacent the exhaust pipe opening with the semicylindrical wall thereof spaced from the exhaust pipe and in the deflected airflow upstream of the exhaust pipe opening to split the deflected airflow around the exhaust pipe, said semi-cylindrical wall having a plurality of perforations in a region thereof generally below the exhaust pipe opening allowing airflow therethrough to prevent low pressure behind the perforated portion of the semicylindrical wall and a solid impervious portion located generally above the exhaust pipe opening to create a low pressure behind the solid impervious portion of the airfoil and above the exhaust opening to thereby draw the exhaust flow upwardly into the deflected airflow.
Claim 4
Dependent Claim
159 words
In a tractor having a roof mounted air deflector and an engine exhaust pipe located behind the air deflector and having an opening discharging engine exhaust into the deflected airflow, an exhaust flow directional device comprising: an airfoil having a semicylindrical wall, means mounting the airfoil on the exhaust pipe adjacent the exhaust pipe opening with the semicylindrical wall thereof spaced from the exhaust pipe and in the deflected airflow upstream of the exhaust pipe opening to split the deflected airflow around the exhaust pipe, said semi-cylindrical wall having a plurality of perforations in a region thereof generally below the exhaust pipe opening allowing airflow therethrough to prevent low pressure behind the perforated portion of the semicylindrical wall and a solid impervious portion located generally above the exhaust pipe opening to create a low pressure behind the solid impervious portion of the airfoil and above the exhaust opening to thereby draw the exhaust flow upwardly into the deflected airflow.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |