US4565175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine cooling system
Assignee: Caterpillar Marine Power UK Ltd
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Filing: 1984-05-18
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Granted: 1986-01-21
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Expires: 2004-05-18
Abstract
Abstract A diesel engine (2) having a charge air cooler (34) is liquid cooled and employs a single heat exchanger (28) for cooling the coolant for both the cylinder block (4) and the charge air cooler (34). The engine block (4) is connected in a first cooling circuit which includes a pump (8) and a thermostatic valve (12), while the charge air cooler 34 is connected in a second circuit including the heat exchanger (28) and pump (30). When the coolant in the first circuit is below the operating temperature, the two circuits operate independently. When operating temperature is reached, the valve (12) opens to bring the two circuits partly in series, with the second circuit between the heat exchanger (28) and the first circuit at the downstream side of the heat exchanger, so that the charge air cooler (34) operates at a lower temperature than the engine cylinder block (4).
Inventors
- 👤 George C. Kaye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:24
CPC Classifications
F; F01; F01P; F01P7/00; F01P7/14; F01P7/16; F01P7/165; F01P3/00; F01P3/20; F02; F02B; F02B29/00; F02B29/04; F02B29/0406; F02B29/0437; F02B29/0443; F01P5/00; F01P5/10; F01P2005/105; F01P2060/00; F01P2060/02; F01P2060/04; F01P2060/16; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
216 words
A cooling system for a diesel engine havng charge air cooling, said system comprising: a first cooling circuit including the cylinder block of said engine; a second cooling circuit including a charge air cooler; each said circuit employing a common liquid coolant; a single heat exchanger for cooling liquid coolant passed therethrough; means for connecting said first circuit, said second circuit and said heat exchanger in series, with said second circuit downstream of said heat exchanger and upstream of said first circuit, said connecting means being temperature controlled in such manner that the two circuits operate independently until the temperature of the coolant in the first circuit reaches a given value; and the connecting means including a temperature-responsive valve in the first circuit, which valve has an inlet and a first outlet connected the first circuit and a second outlet connected to the inlet of the heat exchanger and is arranged to deliver at least a part of the coolant of the first circuit to the heat exchanger when the given temperature is reached, the flow of the liquid coolant in the second circuit not passing through the temperature responsive valve, and the temperature responsive valve being the only liquid coolant control valve positioned in the system for controlling flow between the first and second circuits
Claim 2
Dependent Claim
216 words
A cooling system for a diesel engine havng charge air cooling, said system comprising: a first cooling circuit including the cylinder block of said engine; a second cooling circuit including a charge air cooler; each said circuit employing a common liquid coolant; a single heat exchanger for cooling liquid coolant passed therethrough; means for connecting said first circuit, said second circuit and said heat exchanger in series, with said second circuit downstream of said heat exchanger and upstream of said first circuit, said connecting means being temperature controlled in such manner that the two circuits operate independently until the temperature of the coolant in the first circuit reaches a given value; and the connecting means including a temperature-responsive valve in the first circuit, which valve has an inlet and a first outlet connected the first circuit and a second outlet connected to the inlet of the heat exchanger and is arranged to deliver at least a part of the coolant of the first circuit to the heat exchanger when the given temperature is reached, the flow of the liquid coolant in the second circuit not passing through the temperature responsive valve, and the temperature responsive valve being the only liquid coolant control valve positioned in the system for controlling flow between the first and second circuits
Claim 3
Dependent Claim
26 words
A cooling system according to claim 1, in which the second circuit as a return passage connected to both the heat exchanger and the first circuit.
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) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |