US2422936A - Apparatus for cooling cylinders - Google Patents

Description

June 24, 1947. sw 2,422,936

APPARATUS FOR COOLING CYLINDERS Filed April 21, 1944 2 Sheets-Sheet 1 INVENTOR Russc II P Sweger BY June 24, 1947. R. P. SWEGER 2,422,935

APPARATUS FOR COOLING CYLINDERS Filed April 21, 1944 2 Sheets-Sheet 2 I a a INVENTOR Russzll P. Suleger 3 44 MOW A RriEYs Patented June 24, 1947 APPARATUS FOR COOLING CYLINDERS Russell P. Sweger, Rockford, Ill., assignor. to Barher-Colman Company,- Rockford, Ill., a corpo ration of Illinois Application April 21, 12544, Serial No. 532,089 4 Claims. (Cl. 257 -261) This invention relates to bafiles for use in the cooling of cylinders, particularly cylinders of internal combustion engines having external cooling fins extending therearound.

The practice in cooling such cylinders is to direct streams of air tangentially past each cylinder, and then lead the air streams toward each other around the cylinder to an intermediate outlet where the streams converge and pass out. There is a continuous dead air pocket formed along an element of the cylinder where the streams converge, and the area of the cylinder exposed to this pocket is not cooled properly.

The primary object of the present invention is to overcome this difliculty by providing a novel means for baiiiing the cylinder.

Another object is to divide the two air streams into separate parts and to distribute the parts to a plurality of outlets which are spaced axially and circumferentially oi the cylinder thereby avoiding a continuous dead pocket along an element of the cylinder.

The invention also resides in the novel construction of the baiiie for carrying out the foregoing objects.

Other objects and advantages of the invention will become apparent from the following detailed description taken in connection with the accompanying drawings, in which Figure 1 is a fragmentary elevational view of a radial type internal combustion engine equipped with baffles constructed in accordance with the present invention.

Figs. 2, 3, and 4 are enlarged fragmentary sectional views taken respectively along the lines 2-4, 3--3, and 4-4 of Fig. 1.

Fig. 5 is a fragmentary perspective view of one of the cylinders and its baflie.

Fig. 6 is a fragmentary cross-sectional view taken along the line 6-6 of Fig. 1.

While the invention is susceptible of various modifications and alternative constructions and of being practiced in various ways, I have shown in the drawings and will herein describe in detail the preferred embodiment and manner of carrying out the invention. It is to be understood,

however, that I do not intend to limit the invention by such disclosure, but aim to cover all modifications, alternative constructions and methods falling within the spirit and scope of the invention as expressed in the appended claims.

In the drawings, the invention is illustrated in connection with the cooling of a cylinder ID of a so-called radial internal combustion engine, each cylinder having fins ll lying in planes perpendicular to the cylinder axis and closely spaced to each other so as to provide surfaces 01! substantial area over which a cooling medium such as air may be directed to cool the cylinder. In accordance with the usual practice, a bafiie l2 constructed of sheet metal is mounted on the engine in any suitable way and formed with annularly spaced semi-cylindrical members B which fit closely around the rear or down stream sides of the cylinders and are connected by intervening imperforate webs l4. With this arrangement, a body of air directed against the front of the engine is divided by the cylinders l0 into streams A and B which flow around the cylinders into the circumferentially extending spaces defined by the flns II, the external cylinder surface, and the bafiie member I3.

The present invention aims to avoid the formation of a continuous dead spot along the cylinder at the points where the streams A and B impinge against each other. To this end, the two air streams flowing around each cylinder are divided into a plurality of corresponding increments which converge upon each other and on the rear side of the cylinder and flow out through openings l5 and I6 which are spaced apart both circumferentially and axially of the cylinder so as to stagger the dead areas ll and ill of the adjacent pairs of impinging stream increments.

To carry out this method, the outlet openings l5 and it, which are somewhat elongated in a circumferential direction, are arranged in two rows extending parallel to the cylinder axis but circumferentially spaced apart so as to leave imperforate areas i5 0! the bailie i3 intervenin between the holes l5, and similar imperforate areas it between the holes iii of the other row.

The holes l5 and 16 are formed by striking metal out of the bailie member l3 to form flanges l5 and I6 projecting toward the cylinder from the concave side of the baille. These flanges thus extend circumferentially, and their spacing is correlated with the spacing of the flnsli so that the adjacent flanges of each row register and lie substantially in abutment with alternate ones of the cylinder fins (see Fig. 2).

It will be observed that the flanges iG cooperate with the intervening bailie area It to define a circumferentially extending passage for carrying a portion of the air stream A past the adjacent holes It to a hole l5 which lies in the same axial plane as this portion a of the stream. Similarly, the adjacent fins li cooperate with intervening areas l5 to define passageways which aeaaoao 3 carry portions b of the air stream 13 past the holes I5 and deliver these stream increments to the correspondingly spaced holes I at which point the increments b converge upon the stream increments a and are discharged outwardly through the holes It as illustrated-in Fig. 3. In a similar way, the increments b of the stream B and the increments a of the stream A which are carried past the holes I converge upon each other as illustrated in Fig. 4 and are diverted outwardly through the openings II. The dead areas It formed by the converging stream increments aand b are spaced circumferentially around the cylinder I0 from the pocket I! formed between the converging streams A and B with the result that there is no continuous element of the cylinder exposed to a dead area. Accordingly. each area of the cylinder I which is exposed to one of the dead air areas I! or II is of comparatively small dimension and is flanked on all four sides by areas of the cylinder which are exposed to the moving area and, therefore, is cooled by thermal conduction from the latter areas. As a result, the temperature of the cylinderopposite the air outlets is reduced considerably, and the cylinder is therefore cooled more effectively. Moreover, the flanges Iii and IE divide the air streams A and B and guide the increments to the outlets in well defined paths thereby avoidin turbulence which further contributes to the cooling emciency.

I claim as my invention:

1. A device for bafliing a cylinder comprising a semi-cylindrical member adapted to fit around one side of said cylinder in spaced relation thereto to provide air passages between the cylinder and the concave surface of said member, said member having intermediate its edges two rows of holes therein staggered along an element of the semi-cylinder, and circumferentially extending flanges projecting from said concave surface at opposite edges of said holes and disposed substantially perpendicular to such surface, the adjacent flanges in each row of holes cooperating with each other and the intervening imperforate portion of said member to define a passage for directing an air stream circumferentially along said concave surface and past the holes of such row to a hole of the other row.

2. A device for bathing a cylinder having axially spaced peripheral cooling fins, said device comprising a semi-cylindrical member adapted to fit around one side of said cylinder adjacent said fins and having intermediate its edges rows of holes therein staggered along an element of the semi-cylinder with the spacing of the holes in each row correlat d with the spacing of said fins, and circumferent ally extending flanges projecting from the concave surface on opposite sides of said holes and spaced apart to register individually with said fins, the adjacent flanges form rows of holes staggered relative to each other, the struck-out metal forming flanges at opposite edges of the holes and extending circumferentially of the baffle whereby the adjacent flanges coact with each other to form an air passage.

4. A baflle for directing a cooling medium around an engine cylinder. comprising an arcuate piece of sheet metal having the metal thereof intermediate its edges struck inwardly from the concave side of the piece to form rows of holes staggered relative to each other, the struck-out metal forming generally parallel flanges disposed at opposite edges of the holes and substantially perpendicular to said concave side and extending circumferentially of the baflie whereby the adjacent flanges form an air passage between them.

RUSSELL P. SWEGER.

0 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,031,891 Irgens Feb. 25, 1936 674,276 Hanson May 28, 1901 FOREIGN PATENTS Number Country Date 110,125 Great Britain Oct. 11, 1917

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