US2227933A

US2227933A - Finned engine cylinder

Info

Publication number: US2227933A
Application number: US269870A
Authority: US
Inventors: Donald S Hersey
Original assignee: United Aircraft Corp
Current assignee: Raytheon Technologies Corp
Priority date: 1939-04-25
Filing date: 1939-04-25
Publication date: 1941-01-07
Anticipated expiration: 1958-01-07

Description

Jan.7, 1941. DSLHERSEY 2,227,933-

FINNED ENGINE CYLINDER Filed April 25, 1939 a2 I /2 M ,4

24 U 28 i g I llllllnul I "U 1 H /6"f-L l I III II l I L I I 1 I v INVENTOR V I flDIJHHSZi-Z'I'SW smw -\TTORNEY Patented Jan. 1, 1941 UNITED STATES PATENT OFFICE FINNED ENGINE CYLINDER. Donald S. Hersey, West Hartford, Conn assignor to United Aircraft Corporation, East Hartford, Conn, a corporation of Delaware I Application April 25, 1939, Serial No. 269,8'lll 1 Claim.

This invention relates to an improved construction for finned engine cylinders and has for an object the provision of improved means for producing a composite engine cylinder.

A further object of the invention. resides in the provision of an improved cylinder construction having a steel barrelportion, sheet metal fins andan aluminum intake duct and valve mechanism supports. i

I A still further object resides in the provision of improved means for securing aluminum fins toya steel cylinder barrel and providing suitable supports for the valves and valve operating mechanism.

5 Other objects and advantages will be more particularly pointed out hereinafter or will become apparent as the description proceeds.

In the accompanying drawing, in which like reference numerals are used to designate similar parts throughout, there is illustrated an example of an improved cylinder constructed according to purpose of illustration only and is not to be taken as limiting or restricting the scope of the invention. i

In the drawing, the single figure is a longitudinal sectional view of a finned engine cylinder constructed according to the invention, a portion of the cylinder barrel being shown in elevation.

0 Referring to the drawing in detail, the numeral j I 0 generally indicates a cylinder barrel, preferably formed of steel of desired physical characterlstics. The cylinder is provided with a closed outer end in the form of a combustion chamber iiiv dome within which are provided the valve ports and spark plug apertures, the intake valve port being indicated by the numeral l2, the exhaust port by the numeral ll and a spark plug aperture by the numeral I6. Near its open end the .0 cylinder barrel is provided with an external flange i8 by means of which it maybe secured to an engine crankcase and has below the flange a skirt portion adapted to extend through the cylinder aperture in the crankcase to assist in L5 maintaining the cylinder in position on the crankcase and to bring a portion of the cylinder within the diameter of the crankcase. Above the crankcase the cylinder barrel is provided with external beads as indicated at 22, 24 and 26 for a purpose 50 which will presently appear.

Above the bead 22 the barrel is surrounded by a series of annular fins of varying diameter, as generally indicated at '28. These fins are preferably made of sheet metal in order to provide is closely spaced heat radiating fins of great depth the invention. The drawing, however, is for the.

which are, at the same time, equally spaced an suificiently strong to resist the vibratory effect imposed on the cylinder by the engine operation. The cylinder head and the exhaust port casing ina jig or fixture and the 'fins are assembled l5 about it and alternated with split spacing rings to provide the proper spaces between the individual fins. The jig preferably has an outer casing the interior of which bears against the peripheries of the fins which are cut to the proper 20 diameters so that as the fins are assembled about thebarrel which is held in the jig the proper spacing will be maintained between the inner edges of the fins and the exterior'surface of the barrel.

Suitable molds are centered on the intake port l2 to provide the intake conduit, intake valve. guide 14, and intake valve mechanism housing I6, and a mold is also centered on the combined exhaust conduit liner and valve guide 38, which 30 is preferably made of steel and welded or otherwise secured to the barrel in before beginning assembly of the fin, to provide the exhaust valve mechanism housing 40.

After the fins and molds have been assembled about and upon the barrel Ill within the forming Jig or external mold, molten aluminum is forced under high pressure into the spaces between'the cylinder barrel and the fins and fin spacers, and the spaces about the valve conduits and valve 40 mechanism housing molds to provide a matrix of die cast aluminum between the barrel and the inner edges of the fins, and die cast valve housings. As indicated by the line 42 the fin spacers terminate somewhat short of the inner 45 edges of the fins to permit the cast metal to surround the inner edges of the fins for an appreciable depth to provide a good heat conducting bond between this metal and the fin the same time it perfects the bond with the exterior surface of the cylinder barrel.

The head 22 may effectively cooperate with the exterior mold to limit the downward extent of the fin securing casting, the intermediate bead 24 extends .into the casting to increase the strength of the bond between the casting and the barrel in a direction longitudinally of the barrel while the bead 26, besides reinforcing the barrel around the others skilled in the art may clearly understand" the same, what it is desired to secure by Letters Patent is as follows:

A composite engine. cylinder comprising, a steel barrel member having a closed head end providing a combustion chamber, valve ports in said head end, a steel exhaust port liner and valve guide secured to the periphery of the exhaust port in said head end, spaced sheet metal fins surrounding said barrel and overlying the head end thereof around said ports spaced from the outer surface of said barrel, and an aluminum casting filling the space between the finned portion of the surface of said barrel and said fins and including the inner edges of said fins to provide a supporting and. heat conducting bond between said barrel and said flns,- said casting also surrounding said exhaust conduit liner and valve guide and extending therebeyond to provide a valve mechanism support and extending outwardly from the intake port in said head to provide an intake conduit and'valve guide and valve mechanism support for said cylinder.

DONALD S. HERSEY.