US 1821434 A
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Description (OCR text may contain errors)
Sept 1, 1931. E. H. HAMILTON COOLING FIN FOR INTERNAL COMBUSTION ENGINES Filed Jan. 27, 1923 INVENTOR W r/vEssEs :1
Fatented Sept. l, 193i ERWIN n. HAMILTON, or RIVERDALE, NEW Yon cooLInG FIN roarn'rnnnni. eoiasesmasmms Application filed January 2?, 1923. Serial No. 615,401.
This invention relates to improvements in the construction and formation of cooling or heat radiating fins. One use for such fins that will be referred throughout the following specification is upon air-cooled internal com bustion engines. i
It is one object of my invention to provide a typeof cooling fin, or rather a plurality of fins that will bring the whole body of cooling air into more intimate contact with the cooling surfaces. I
It is another object of my invention to provide a construction of cooling fin, which when assembled with a plurality of other cooling fins, will create a turbulent flow of air through the air passages between the cooling this.
It is a further object of my invention to provide cooling surfaces that will cooperate with each other to create a constantly diverging but nevertheless forwardly progressing current of air passing over the cooling surfaces.
It is a still further object of .my-invention' to provide a plurality of cooperating cooling fins with inclined surfaces, the inclination being so designed and spaced with respect to each other that a current of air flowing over the cooling surfaces will flow from one inclined surface to another surface inclined in the same general direction but spaced later- .ally therefrom, so that while the current of air between thecooling surfaces is caused to constantly change its path, there nevertheless is nothing located in the paths to which the air currents are directed so as to cause an abrupt arresting of the currentsof air, but
rather a steady forward progression in: as
not in fact present. r 7
Other and further objects of my invention will be apparent from the following specification taken in conjunction with the'accompanying drawings, wherein Figure 1 is a fragmentary view of a cyllarge volume as if the inclined surfaces were inder provided with continuous, one-piece cooling fin of my improved construction,
Fig. 2 is a fragmentary view of a surface to be cooled equipped with straight cooling fins surrounded by-a shroud or contacting cooling surface of my improved construction;
Fig. 3 is a fragmentary view of a surface to be cooled, and cooling fins, the surface to be cooled being constructed as the outer cooling surface or shroud of Fig. 2;
Fig. 4 is a modified form of cooling fins provided with indentations of a conforma tioi to produce the above-referred to effects, an
Fig, 5 is a further modified form of cooling fin arrangement providing the type of 00- acting inclined surfaces referred toabove.
Referring to Fig. 1, the cylinder 2 is.pro-
vided with a plurality of cooling fins l, spaced laterally from each other.
The cooling fins 1 are provided with a plurality of corrugations or indentations 4;. These corrugations or indentations are not of the substantially semi-circular shape, but are each; provided with gradually sloping surfaces 3 and 5, which terminate in the base or apex of theindentation on respective sides surface that is more or less at right angles to its path, but instead the cur} rent of air passes over the head of the particular indentation t and directly onto and along the surface 5 of that indentation. The current of air will flow along the surface 5 into the indentation connected thereto, and
along its surface corresponding to the surface 3 referred to above, which surface 3 will direct the current of air back toward the fin from which it first came, but diagonally and in a forwardly progressing direction, where the current of air will engage another in clined surface that is inclined in the direction of its flow.
The above described cycle is occurring between each pair of fins and along the surfaces 3 and 5 of the indentation spaced laterally and diagonally from each other.
Referring now to'Fig. 2, a cooling surface 22 is shown as provided with a plurality of laterally spaced cooling fins 21 that are here shown as the usual and customary straight surface cooling fins, These are surrounded and bound by a cooling fin or surface or shroud 23, which cooling surface is provided with a plurality of indentations 2 1 each re spectively provided with inclined surfaces 26' and 27, corresponding respectively to the surfaces3 and 5 described above in connection with Fig. 1.
In this form of the invention, the air currentwill be directed from a surface 27 di agonally across to the surface 22 to be cooled, and be deflected from that surface diagonally back to the fin or shroud23, where it will engage a surface 26, flow into and out of an indentation 2% in the same manner as described above in connection with Fig. 1, without an abrupt interruption of the air current which will result: in eddy currents in the indentations and thus interfere with the full cooling effect of the particular volume of air passing between the cooling fins.
Referring to Fig. 3, the reverse of the arrangement of Fig. 2 is shown. Herethe surface to be cooled 32, is provided with a plurality of cooling fins 31 that are surrounded bya shroud 33, the cooling fins and shroud 33' being shownas straight, smooth surfaces. The outer surface of the surface to be cooled is provided with a plurality of indentations 3 1 each having an inclined surface 36' and'3'? respectively of the same shape and adapted to function in the same manner as described in connection with Fig. 2.
Referring'to Fig. 4, there is shown a modified construction of cooling fin. The cylinder 42 is provided with a plurality of spaced cool ing fins 11. There is struck-up or pressed in each fin a plurality of baflie sections 4L5. Each section resembles in shape one half section of a cone,and the two adjacent baffles are arranged with the bases of the cone sections toward each other. With this form and arrangement of baflies the air currents are caused to bedeflected from one cooling fin to another and there, is no danger of causing an abruptarresting of the forwardly moving air currents. whilethe air currents are nevertheless put in a state of commotion so asto cause the full volume of air to engage the surfaces of the cooling fins.
In Fig. 5 there is shown a still further modified arrangement of cooling fins and battles. Herein, the wall 52 to be cooled is provided with a plurality of cooling fins 51 which are straight sided members spaced apart. Mounted in the channels between the fins are a plurality of baffles 56 which are oblong shaped and arranged angularly with one baffle inclined in one direction and the next adjacent baffle inclined in a direction substantially at right angles to the first baflle, and so on alternately along the channels. However it will be noted that thebaflles are not arran 'ed vertically and horizontally but angularly so that the air currents are directed back and forth from fin to fin but are always free to progress forwardly through the channel unimpeded but in fact directed by the angularly arranged surfaces of the baffles.
From the foregoing it will be seen that I have provided a number of arrangements or constructions of cooling fins and/or associated baffles that accomplish almost equally well the major purpose of this invention of placing the air currents passing over a surface to be cooled in substantial commotion so as to bring the mass of air in contact with the surfaces and yet aid and abet the movement of the turbulent air through the channels between the cooling fins by proper direction and guidance thereof, while at the same time increasing the area of the cooling surfaces.
t will be understood that various modifications and arrangement of parts may be the air current whereby the full volume of air thereoverin a continuous forwardly progressing movement.
means for assisting in such cooling and governing the direction of flow of said air currents, some of said means presenting inclined surfaces to causethe air currents to flow from a one surface to another, the direction of inclination being in the direction to cause continuous forward progression of the air currents over the cylinder.
4. The combination with a cylinder adapt- 10 ed to be cooled by air currents passing thereover, of a plurality of heat radiating devices mounted thereon and arranged With inclined surfaces over which air currents may pass, inclined surfaces that are Vertically spaced 1 apart of difierent and adjacent radiating devices being in the same plane.
ERVVIN H. HAMILTON.