US3659562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cooling system for rotary internal combustion engine
Assignee: John Deere Technologies International Inc
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Filing: 1971-01-27
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Granted: 1972-05-02
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Expires: 1991-01-27
Abstract
Abstract The air cooling system for a rotary piston, internal combustion engine, having a liquid cooled rotor and means defining a divided circumferential external cooling air flow path for flowing air in a first path adjacent the combustion and expansion sectors of the engine and cooling air in the second path adjacent the intake sector of the engine, comprises a liquid heat exchanger secured adjacent the intake sector of the engine and in the second external cooling air flow path so that heated liquid from the engine rotor is passed in indirect heat exchange relation to cooling air flowing through the second path. The heat exchanger is constructed and arranged to provide a pressure drop in the cooling air flow, downstream from the point of divergence of the cooling air flow, to automatically meter a smaller quantity of the cooling air flow in the second flow path than through the first flow path.
Inventors
- 👤 Charles Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:50
CPC Classifications
F; F02; F02B; F02B55/00; F02B55/02; F02B55/04; F02B55/06; F02B53/00; F02B2053/005
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
190 words
In an air cooling system for a rotary piston internal combustion engine having a liquid cooled rotor and means defining a divided, circumferential cooLing air flow path for flowing air in one path adjacent the combustion and expansion sectors of the engine and in the other path adjacent the combustion intake sector of the engine, the combination comprising: a. the disposal of heat exchange means adjacent to the combustion intake sector of the engine, and in the said other cooling air flow path; b. said heat exchange means being constructed and arranged to receive heated liquid coolant from the engine and pass the same in indirect heat exchange relationship with the cooling air in said other flow path to cool the liquid coolant and discharge the cooled liquid coolant into the engine; and c. restricting means downstream in relation to the direction of cooling air flow from the point of divergence of the cooling air flow for providing a pressure drop in said other cooling air flow path to automatically meter a lesser mass flow of cooling air flowing in said other flow path than through the first flow path.
Claim 2
Dependent Claim
190 words
In an air cooling system for a rotary piston internal combustion engine having a liquid cooled rotor and means defining a divided, circumferential cooLing air flow path for flowing air in one path adjacent the combustion and expansion sectors of the engine and in the other path adjacent the combustion intake sector of the engine, the combination comprising: a. the disposal of heat exchange means adjacent to the combustion intake sector of the engine, and in the said other cooling air flow path; b. said heat exchange means being constructed and arranged to receive heated liquid coolant from the engine and pass the same in indirect heat exchange relationship with the cooling air in said other flow path to cool the liquid coolant and discharge the cooled liquid coolant into the engine; and c. restricting means downstream in relation to the direction of cooling air flow from the point of divergence of the cooling air flow for providing a pressure drop in said other cooling air flow path to automatically meter a lesser mass flow of cooling air flowing in said other flow path than through the first flow path.
Claim 3
Dependent Claim
12 words
The apparatus of claim 1 wherein said restricting means includes baffle means.
Claim 4
Dependent Claim
18 words
The apparatus of claim 1 wherein said heat exchange means comprises a tubular means having extended surface elements.
Claim 5
Dependent Claim
34 words
The apparatus of claim 1 wherein said heat exchange means includes a tubular conduit means forming a plurality of substantially parallel passes interconnected to provide series flow of cooling liquid through the parallel passes.
Claim 6
Dependent Claim
17 words
The apparatus of claim 4 wherein each of said plurality of parallel passes have extended surface elements.
Claim 7
Dependent Claim
33 words
The apparatus of claim 1 wherein said heat exchange means includes a plurality of substantially parallel tubes having fins attached thereto and interconnected to provide series flow of cooling liquid through the tubes.
Claim 8
Dependent Claim
22 words
The apparatus of claim 1 wherein said metering means includes baffle means constructed and arranged to provide a restricted cooling air port.
Claim 9
Dependent Claim
42 words
The apparatus of claim 1 wherein said restricting means includes baffle means constructed and arranged to define a restricted cooling air outlet opening downstream relative to the direction of said other path of the cooling air flow from the heat exchange means.
Claim 10
Dependent Claim
24 words
The apparatus of claim 1 wherein said restricting means functions to increase the velocity of the cooling air flow adjacent the heat exchange means.
Claim 11
Dependent Claim
49 words
The apparatus of claim 1 wherein said restricting means is located downstream relative to the direction of said other path of the cooling air flow from the heat exchange means and is constructed and arranged to have a venturi effect on the air flowing past the heat exchange means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |