US1607346A - Air-cooled-engine cylinder - Google Patents

Description

Nov. 16 1926.

J. M. HEINRICH AIR cooLED ENGINE CYLINDER Filed Nov. 25, 1924 2 Sheets-Sheet l Nov. 16 1926. 1,607,346

J. M. HEINRICH AIR COOLED ENGINE CYLINDER Filed Nov. 25, 1924 2 Sheets-Sheet 2 Patented Nov. 16, 192.6.

UNITED STATES` L 1,607,346- PATENT oFFIcE.

JEAN MARIE HEINRICH, 0F PARIS, FRANCE, ASSIGNOB TO SOCIT DES MOTEURS SALMSON (SYSTME CANTON-UNN), 0F EAI-LIS, FRANCE.

AIR-COQIIED-ENGHVE CYlLINDER.

Application ledNovember 25, 1924, Serial No. 752,220, and in France January 4, 1924.

The present invention has for its object an improved air-'cooled cylinder for inte/rnal combustion engines.

According to the invention, the englne cylinder comprises a jacket which is made of a light and good heat-conducting metal and is provided with air cooling ribs, said jacket being separately secured to or preferabl cast upon the cylinder properly so calle The jacket may be connected to the latter by all suitable mechanical means, and one important feature of the Ainvention 1s that it can be used with cylinders which have already been constructed in view of other methods of cooling.

Other features of the invention will be set forth in the following description with reference to the appended drawings which are given by way of example and wherein:

F 1 is averticalV sectionfon the line C-C/g (Fig. 2) of an air-cooled cylinder for internal combustion engines, according to M the invention.

Fig. 2 is a corresponding plan view.

Fi 3 is a half section of the explosion cham er of the cylinder, on the line A-B of Fig. 2, and

Fig. 4 is a half section of the said chamber on the line B-C of Fig. 2. l

Figs. 3 and 4 show modifications of the means connecting the cylinder and the jacket.

1 is the cylinder properly so called which is made of a strongmetal, such as` steel or cast iron, and worked in the usual manner, said cylinder 'comprising (preferabl integral with the cylindrical body 2) t e cylinder head 3, the inlets 4 and outlets with their respective valve seatings 6 and 7 and valve guldes 8 and 9, the ignition aperture 10 or the aperture 11 for compression cock, and the bearing parts 12 for securing the valve levers, and like parts. `The cylinder head and the major part of the cylindrical body 2 are surrounded by a radiating jacket 13 which is made of a metal which is good conductor of heat and -is preferably of a light nature, particularly for the cylinders of aeroplane engines; the said metal may be for instance an alloy of aluminum. The jacket 13 is formed with cooling ribs 14 which are of suitable size and shape to offer a lar e surface of contact with the current of'coo 'ng air and an efficient radiation of heat.

,ner surface of the cylinder.

The said jacket 13 may consist of a number of pieces which are mechanically fitted upon the cylinder 1, but the drawings show a jacket which is cast around. the said cylinder, the casting operation being performed with greater facility than the adjustment of a jacket made in several parts, and the casting also affords a betterl adhesion of the metal of the jacket to the metal of the cylinder, so that the heat produced in the cylinder is conducted to thel exterior in a more effective manner.

Since the said jacket consists of a metal havin relatively vbut little strength, it is not a apted to withstand heavy mechanical stresses for any length-of time, its function being limited in principle to the radiation of the heat. Means must therefore be provided to secure the proper connection between the said jacket and cylinder l, at the same time affording a good contact between the metals for the transmission of heat. When the said jacket is to be cast upon the cylinder,Y as herein represented, grooves 15 maybe provided upon the cylinder body 2, before casting, said grooves being longitudinal, helical or simply circular; said grooves are also shallow in order that the strength of the cylinder 1 shall not be diminished,

Ybut they may have a close spacing without inconvenience. Suitable rings 16 of strong metal are preferably imbedded in the lcooling ribs during the casting in order to secure a tight fitting upon the cylinder and toprovide for a good maintenance for the jacket. Should the wall of the cylinder 1 have a suilicient thickness, one may turn therein suitable bosses, such as the knob 17 which is formed on the cylinder head 3, in order to hold the metals together. On the thinner pgrts of the cylinder wall separately secured obs 18, screwed or riveted to the said wall, may be provided and serve the same purpose as the knobs 17.

Fig. 3 shows another method of connecting the said cylinder and jacket. When the jacket has been cast upon the cylinder, holes are formed through the double wall thus obtained and rivets 19 are inserted through said holes and are countersunk upon the in- The said rivets may be made of a good conducting metal,

and they will be more effective in withdrawof the said jacket, even though comparatively weak, be suicientl malleable (which condition may be readi y obtained) holes may be made, before the casting operation, in the wall of the cylinder, so that the metal of the jacket will form the nibs 20, Fig. 4, these bein pounded down upon the interior of the cy inder after the manner of rivets in order to secure a tight fit. The rivets 19 and the nibs 20 will constitute I,auxiliary heat-withdrawing means, these being disposed to advantage at the hottest points on the cylinder.

The saidjacket, whether applied in separate parts or cast inA one piece, may be placed upon an already constructed cylinder which hasbeen preliminarily designed for use with aV water jacket, and in such case it is simply necessary to remove the said jacket and (in the case of a cast jacket) to take the necessary dispositions for obtaining suitable connecting means between the metals of the cylinder and the jacket 13. The slight ad dition in the mechanical strength which is afforded by the said jacket allows of forming grooves, rivet, holes, tappet holes, connecting knobs, or the like, upon the cylinder itself without diminishing the totalstrength of the cylinder. For cylinders arranged and machine-treated for use with a water jacket, the flange 21 which serves to secure the water 'jacket and is integral with the cylinder (Fig. 1) will constitute an additional element by which the lower part of thejacket 13 is connected to the cylinder.

l But for a specially-designed type of cylinder which is to be. employed with the jacket according tothe invention, the ar'- rangement will be facilitated inasmuch as the draftsman will now have the choice of' ing iven solely by way of example, and in p particular, all suitable means of connection between the cylinder properly so called and the radiating jacket may be employed without departing from the spirit of the invention.

Having now described my invention, what I claim as new and desire to secure by Letters' Patent is:

1. An engine cylinder comprising in combination a cylinder core, an outer coating of a good heat-conducting metal cast upon said cylinder core and rivets for connecting said cylindercore to said coating.

2. An engine cylinder comprising in co1n bination a cylinder core, an outer coating of a good heat-conducting metal cast upon said cylinder core and rivets for connecting said cylinder core to said coating and being also of a good heat conducting metal, and disposed at the points of the cylinder which are at the highest temperatures when the engine is working.

3. An engine cylinder comprising in com,- bination a cylinder core, an outer coating of a good heat-conducting metal vcast upon 'said cylinder core and flush rivets for connecting said cylinder core t0 said coating.

In testimony whereof I have signed my name to this specification.

v JEAN MARIE HEINRICH.

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