US5369883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making an in tank oil cooler
Assignee: Dana Canada Corp
•
Filing: 1993-11-08
•
Granted: 1994-12-06
•
Expires: 2013-11-08
Abstract
Abstract A heat exchanger and method of making same is disclosed. The heat exchanger is particularly useful for cooling automotive engine oil or transmission fluid, the exchanger being located inside the radiator or other part of the engine cooling system. The heat exchanger is made from a plurality of stacked plates formed of cladded metal, the plates being assembled into face-to-face pairs, each pair having a turbulizer located therein. The plates also have outwardly disposed dimples which are in contact when the plates are arranged back-to-back. The turbulizer is thicker than the spacing between the assembled plates prior to brazing the assembly. The dimples maintain good contact between all heat transfer surfaces while the assembly is completed by brazing.
Inventors
- 👤 Allan K. So
- 👤 Nicholas F. Avery
- 👤 David G. Rowntree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:53
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/06; F28F13/12; F28D; F28D9/00; F28D9/0031; F28D9/0043; F28F3/00; F28F3/02; F28F3/04; F28F9/00; F28F9/02; F28F9/0234; F28D21/00; F28D2021/0019; F28D2021/008; F28D2021/0089; F28F2275/00; F28F2275/04; F28F2275/12; F28F2275/122; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49366; Y10T29/49393
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
136 words
A method of making a heat exchanger comprising: providing a plurality of plates, each plate having a planar central portion, a raised, peripheral edge portion located above and in a plane parallel to the central portion, and opposed end bosses located below and in a plane parallel to the central portion, the end bosses having inlet and outlet openings formed therein; arranging said plates into a face-to-face pair having mating peripheral edge portions and a hollow space therebetween; inserting a turbulizer into said hollow space, the turbulizer being of such thickness that the mating peripheral edge portions are spaced apart; heating the plate pair; compressing the turbulizer by pressing the plate pair together thereby drawing the mating peripheral edge portions together; and joining contacting areas of the plates and turbulizer to form a fluid tight assembly.
Claim 2
Independent Claim
136 words
A method of making a heat exchanger comprising: providing a plurality of plates, each plate having a planar central portion, a raised, peripheral edge portion located above and in a plane parallel to the central portion, and opposed end bosses located below and in a plane parallel to the central portion, the end bosses having inlet and outlet openings formed therein; arranging said plates into a face-to-face pair having mating peripheral edge portions and a hollow space therebetween; inserting a turbulizer into said hollow space, the turbulizer being of such thickness that the mating peripheral edge portions are spaced apart; heating the plate pair; compressing the turbulizer by pressing the plate pair together thereby drawing the mating peripheral edge portions together; and joining contacting areas of the plates and turbulizer to form a fluid tight assembly.
Claim 3
Dependent Claim
21 words
A method as claimed in claim 1 wherein the step of compressing is done by squeezing together the planar central portions.
Claim 4
Dependent Claim
44 words
A method as claimed in claim 1 and further comprising the steps of providing a cladding layer on the plates, melting the cladding layer while compressing the turbulizer and embedding the turbulizer in the cladding layer until the peripheral edge portions come into contact.
Claim 5
Dependent Claim
42 words
A method as claimed in claim 3 and further comprising the step of crimping a peripheral edge portion of the turbulizer by the plates of the plate pair at a location between the planar central portions and the plate peripheral edge portions.
Claim 6
Dependent Claim
64 words
A method as claimed in claim 2 wherein the squeezing step is done by providing said central portions with a plurality of spaced-apart, outwardly disposed dimples, the dimples extending equidistant with the end bosses; and squeezing one plate pair between two adjacent plate pairs positioned in a back-to-back arrangement, the dimples on the adjacent plate pairs being in alignment and transmitting compressive forces therebetween.
Claim 7
Dependent Claim
42 words
A method as claimed in claim 2 and further comprising the steps of assembling a plurality of said plate pairs into a stack with said inlet and outlet openings in registration, and joining said plate pairs together in a fluid tight assembly.
Claim 8
Dependent Claim
51 words
A method as claimed in claim 1 and further comprising the step prior to compressing and heating the plate pair of assembling a plurality of said plate pairs into a stack with the inlet and outlet openings in registration, and then simultaneously heating and compressing all of the stacked plate pairs.
Claim 9
Dependent Claim
27 words
A method as claimed in claim 3 wherein the plates are formed of brazing clad aluminum, and wherein the step of joining is done by furnace brazing.
Claim 10
Dependent Claim
27 words
A method as claimed in claim 7 wherein the plates are formed of brazing clad aluminum, and wherein the step of joining is done by furnace brazing.
Claim 11
Dependent Claim
50 words
A method as claimed in claim 7 and further comprising the step, prior to heating and compressing all of the stacked plate pairs, of adding a top plate pair having a smooth top plate and a bottom plate pair having a smooth bottom plate to the stack of plate pairs.
Claim 12
Dependent Claim
45 words
A method as claimed in claim 10 and further comprising the step of providing inlet and outlet nipples on one of the smooth top and bottom plate, said nipples having inlet and outlet openings communicating with respective inlet and outlet openings of the plate pairs.
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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) | 1997-12-05 | 1998-06-06 | 1998-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-05 | 2002-06-06 | 2002-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-05 | 2006-06-06 | 2006-12-06 | $7700.00 | Window Closed / Lapsed |