US4086959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automotive oil cooler
Assignee: Bank of Nova Scotia
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Filing: 1976-07-19
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Granted: 1978-05-02
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Expires: 1996-07-19
Abstract
Abstract Submerged oil cooler for automotive vehicles requires only two pricipal parts but can provide more heat transfer at a lower pressure drop than conventional oil coolers which utilize three principal parts. In a preferred embodiment, an outer tube having a helically corrugated surface is hand press fit over an inner tube having an outer surface which is helically finned and has rows of longitudinal grooves formed in the fins. The tubes are sealed at their ends so as to define an extended annular flow channel for oil between the tubes, while permitting engine coolant in which the cooler is submerged to flow through the inner tube. In a modified arrangement, longitudinally milled slots are substituted for the formed grooves.
Inventors
- 👤 Edward P. Habdas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:34
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/0234; F28F1/00; F28F1/10; F28F1/42; F28F1/422
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
190 words
In a submerged oil cooler for automotive vehicles comprising a hollow inner length of tubing through which engine coolant may flow and an outer length of tubing sealed at its ends to the inner tubing and having an inner surface which cooperates with the outer surface of the inner length of tubing to define a generally annular flow passage for oil which may pass through inlet and outlet fittings at opposed ends of the cooler, the improvement wherein said inner length of tubing includes an integral, generally transversely helically finned outer surface along the major portion of its length and said outer length of tubing is helically corrugated over the major portion of its length to include root portions which are of an internal diameter slightly greater than the external fin diameter of the inner length of tubing and crest portions which are spaced from said fins, said fins being periodically longitudinally grooved around the circumference thereof, whereby the oil flowing through said flow passage will move generally longitudinally in a first path defined by said longitudinal grooves and generally helically in a second path defined by said helical corrugations.
Claim 2
Dependent Claim
190 words
In a submerged oil cooler for automotive vehicles comprising a hollow inner length of tubing through which engine coolant may flow and an outer length of tubing sealed at its ends to the inner tubing and having an inner surface which cooperates with the outer surface of the inner length of tubing to define a generally annular flow passage for oil which may pass through inlet and outlet fittings at opposed ends of the cooler, the improvement wherein said inner length of tubing includes an integral, generally transversely helically finned outer surface along the major portion of its length and said outer length of tubing is helically corrugated over the major portion of its length to include root portions which are of an internal diameter slightly greater than the external fin diameter of the inner length of tubing and crest portions which are spaced from said fins, said fins being periodically longitudinally grooved around the circumference thereof, whereby the oil flowing through said flow passage will move generally longitudinally in a first path defined by said longitudinal grooves and generally helically in a second path defined by said helical corrugations.
Claim 3
Dependent Claim
29 words
A submerged oil cooler in accordance with claim 1 wherein said longitudinal grooves are defined by bent over portions of the tips of the fins on the inner tube.
Claim 4
Dependent Claim
25 words
A submerged oil cooler in accordance with claim 2 wherein adjacent grooves aroung the circumference of the inner tube are bent in alternate axial directions.
Claim 5
Dependent Claim
29 words
A submerged oil cooler in accordance with claim 1 wherein said longitudinal grooves are defined by slots cut out of the material of the fins on the inner tube.
Claim 6
Dependent Claim
29 words
A submerged oil cooler in accordance with claim 1 wherein said inner length of tubing contains between about 6 and 24 longitudinal grooves around the circumference of its fins.
Claim 7
Dependent Claim
22 words
A submerged oil cooler in accordance with claim 5 wherein said grooves have a depth of from about 0.015 - 0.050 inches.
Claim 8
Dependent Claim
38 words
A submerged oil cooler in accordance with claim 1 wherein said outer length of tubing is helically corrugated at a pitch of about 0.250 - 0.750 inches with said corrugations having a depth of 0.040 - 0.090 inches.
Claim 9
Dependent Claim
25 words
A submerged oil cooler in accordance with claim 7 wherein said inner length of tubing includes from about 11-26 integral fins per inch of length.
Claim 10
Dependent Claim
78 words
A submerged oil cooler in accordance with claim 1 wherein said outer tubing has about a 1,000 in. OD, a pitch of about 0.379 inches, a depth of corrugation of about 0.088 in., and a wall thickness of about 0.025 in. while said inner tubing has about 19.6 fins per inch with a tip height of 0.058 in., said fins including about 12 circumferentially spaced longitudinal grooves formed by deforming the fin tips with a round nosed tool.
Claim 11
Dependent Claim
22 words
A submerged oil cooler in accordance with claim 9 wherein alternate grooves are formed by deforming said fin tips in alternate directions.
Claim 12
Dependent Claim
80 words
A submerged oil cooler in accordance with claim 1 wherein said outer tubing has about a 1,000 in. OD, a pitch of about 0.379 inches, a depth of corrugation of about 0.088 in., and a wall thickness of about 0.025 in. while said inner tubing has about 19.6 fins per inch with a tip height of 0.058 in., said fins including about 12 circumferentially spaced longitudinal grooves formed by removing the material of the fin tips to create notches therein.
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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) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |