US 2398216 A
Description (OCR text may contain errors)
v April 9, 1946- w. H, FRANCISCO, JR 2,398,216
COMB INE'D AIR DEFLECTOR AND FIN BRAQE Filed April 24, 1945 s sheets-sheet 1 UEUEUEEEE HDEUUDUD INVENTOR WILLIAM/7i FRA rfc/sco, dm
ApriE 9, 1946 w. HERA-Nusco, JR 2,398,216
COMBINED AIR DEFLECTOR AND FIN BRACE Filed April 24, 194:5 s sheets-sheet 2 lNv TOR WILLIAM H. NCISCQJR.
ATTORN EY w. H. FRANCISCO, JR 2,398,216
COMBINED AIR DEFLECTOR AND FIN BRACE April 9, 1946.
, l Filed April 24, 1943 3' Sheets-Sheet 5 lNvENToR WILLIAMHFRA Nc/scqdR.
BY ATTORNEY Patented Apr. 9, 1946 COMBINED AIR DEFLECTOR AND FIN BRACE William H. Francisco, Jr., Bloomfield, N. J., as-
signor to Wright Aeronautical Corporation, a
corporation of New York Application April 24, 1943, Serial No. 484,445
This invention relates to a cooling n structure and is concerned with improvement-s in such heat radiating structure particularly as applied to the cylinders of an internal combustion engine.
It is an object of this invention to provide a simple structure by-which the edges of thin, deep heat radiating ns may be secured to one another in order to prevent yrelative movement therebetween. In this way each iin contributes to the rigidity of the whole assembly.l A further object of this invention is to provide a lin brace which does not require prior machining of the ns before the brace may be secured in place.
Another problem in such cooling iin structure is to provide means to conne the airflow to the space between a heat radiating body and the outer perimeter of the fins secured thereto. Accordingly, it is a further object of this invention to provide airow deecting means along the outer perimeter of the fins. A further object of this invention is to provide a member which has the dual function of not only bracing the ns but also of properly delecting and guiding the airflow along the iins.
Other objects of this invention will become apparent in reading the annexed detailed description in connection with the drawings, in which:
Fig. 1 is a front elevation of a cylinder embodying the invention;
Fig. 2 is a view along the line 2-2 of Fig. l;
Fig. 3 is a sectional view along the line 3 3 of Fig. 1;
Fig. 4 is an enlarged view illustrating the combined n bracing and air derlecting members assembled on the ns;
Fig. 5 is a sectional View along the line 5--5 of Fig. 4;
Fig. 6 is an enlarged View of a combined fin brace and air deflecting member; and
Fig. 7 is a section on the line 1 1 of Fig. 6.
Now referring to the drawings, an internal combustion engine cylinder barrel, illustrated at I0, is provided with the usual ns l2, and a cylinder head I4 secured to the cylinder barrel is provided with radial ns I6, axial ns I8 across the head, and ns 20 about the exhaust port. The cylinder head is provided with an intake valve rocker box 22 and an exhaust Valve rocker box 24 together with the usual spark plug holes 26. I'his cylinder head construction is typical of modern radial cylinder air-cooled aircraft engines.
The ns on the cylinder barrel and head are relatively long and thin and therefore are subject to vibration and bending. In order to provide a relatively rigid fin structure a plurality of fin brace members 28 are mounted across the fins. As illustrated in Figs. 6 and 7, each of these elements consists of a sheet metal strip having elongated apertures Si) transversely cut therein. The spacing of these apertures corresponds to the n spacing, and each aperture has a width suflicient to permit passage of the n therethrough. In addition, each iin brace is provided with a curved cross section as illustrated in Fig. 7. With this construction it is possible to aline the apertures 3l! in each iin brace member 28 with the fins to be braced and with the concave side of each brace member facing outwardly. Then the member 28 may be inserted over the ns so that the ns extend through the apertures 30, as illustrated in Figs. 4 and 5. Thus, when assembled over the fins, the web portions 32 of the brace members 28 extend between the ns to provide a substantially rigid brace therebetween. The brace members are mounted so that the adjoining braces overlap,fand.the portion of the ns projecting through the apertures 3D is peened over, as indicated at 32, Fig. 4, to thereby securely hold the bracemembers in place. With this construction no machining of the ns is necessary and since the brace members themselves are all punched out of sheet metal, a very simple and economical structure is provided.
The braces are mounted so that adjoining braces overlap and since the apertures 30 formed in each brace member are closed by the portion of the fin projecting therethrough, these brace members provide an air deflecting surface along the outer edge of the fins. Therefore, these brace members may be used to properly direct the airow around the cylinder barrel and head. Fig. 1 is a front elevation of a conventional air-cooled cylinder having the above described brace members disposed along the sides of the cylinder barrel and over the top of the cylinderv head. In this way, air striking the front of the cylinder is conducted around the cylinder barrel between the barrel and the outer ends of the fins. Similarly on the cylinder head the brace members are disposed so as to conne the airflow to the space between the head and the outer ends of the ns. Thus the iin brace members are adapted to brace and properly space the ns and in addition, when these members are disposed on the cylinder, as herein disclosed, these members are also operative to conne the airow to the space between the cylinder and the outer ends of the fins.
As illustrated in Fig. 3, the brace members 28 are disposed about the sides of the cylinder barrel and head so as to leave an air entrance opening 34 and an air exit opening 36. Similarly, as illustrated in Fig. 2, the brace members 28 are disposed across the top of the cylinder head so as to leave an air entrance opening 38 and an air exit opening 40. The space between adjacent cylinders may be blocked by suitable bafes, as is common practice, for example, as disclosed in Patent No. 2,057,010 to Roland Chilton. However, any desired baffle structure between the adjacent radial cylinders may be used in order to prevent airflow through the space between the cylinders.
It is obvious that although the invention has been disclosed as applied to an air-cooled cylinder for an internal combustion engine, other heat radiating devices may be improved by the use of the above described invention. The arrangement of the brace members on a particular cooling fin structure depends among other things on the direction of the airilow and on the shape or contour of the heat radiating device and its cooling n structure.
While I have described my invention in detail in its present preferred embodiment, it will be obvious to those skilled in the art, after understanding my invention, that various changes and modifications may be made therein without departing from the spirit or scope thereof. I aim in the appended claims to cover all such modications and changes.
I claim as my invention:
1. In combination, a heat radiating body having a plurality of spaced parallel ns, a sheetlike member disposed substantially along the surface delned by the outer edges of said fins and extending a substantial distance along said edges to provide an air deflecting member therealong, said member having a plurality of parallel elon gated slots each closed at both ends, said slots having a width and spacing corresponding to the thickness and spacing of said fins, said iins projecting through said slots and at least a portion of the material of said fins projecting through said slots being deformed to overlap the outer surface of said member adjacent the sides of said slots and the material of said member closing thev ends of said slots extending transversely across the outer edges of said ns.
2. In combination, a heat radiating body having a plurality of spaced parallel fins, combined iin brace and air deilecting means disposed across said ns adjacent their outer edges, said means having a plurality of rows of parallel slots each closed at both ends, said slots having a width and spacing corresponding to the thickness and spacing of said flns, the shape of said means relative to the contour of the outer edge of said fins being such that the fins project through said slots, at least a portion of the material of said fins projecting through said slots being deformed to overlap the outer surface of said means and the material of said means closing the ends of said slots extending transversely across the outer edges of said ns.
3. In combination, a heat radiating body having a plurality of spaced parallel fins, a plurality of combined fin brace and air deector members disposed in side-by-side relation along and adjacent to the outer edges of said fins, said members each being of sheet-like construction and having a plurality of parallel slots each closed at both ends, said slots having a width and spacing corresponding to the thickness and spacing of said ns, said fins projecting through said slots and at least a portion of the material of said fins projecting through said slots being deformed to overlap'the outer surface of the associated member adjacent the sides of said slots and the material of said members closing the ends of said slots extending transversely across the outer edges of said ns.
4. In combination, a heat radiating body having a plurality of spaced parallel iins, combined iin brace and air deflecting means disposed across said fins adjacent their outer edges, said means being of sheet-like material and having a corrugated cross-section defining alternate ridges and grooves disposed transversely of said iins with a row of parallel slots spaced along each groove, the ends of said slots being closed by the material of the ridges on opposite sides of the grooves within which each said slot is disposed, said slots extending across their associated grooves and having a width and spacing corresponding to thc thickness and spacing of said ns, said iins projecting through said slots and at least a portion of the material of said iins projecting through said slots being deformed to overlap the associated grove surface of said means and the ridges of said means extending transversely across the outer edges of said tins.
WILLIAM H. FRANCISCO, Jr..