US1778999A - Cylinder construction for two-cycle internal-combustion engines - Google Patents

Description

Oct. 21, 1930. R E ET AL 1,778,999

CYLINDER CONSTRUCTION FOR TWO-CYCLE INTERNAL COMBUSTION ENGINES Filed Nov. 25,

I H IIIID III I H w; 5 H

James WGa/lowg.

Patented Oct. 21, 1930 UNITED STATES PATENT TOFFI C Ef HERALD B. GREENING, or HAMILTON, ONTARIO; CANADA, AND JAMES weauowrr;

or DETROIT, MICHIGAN, ASSIGNORS TO eALLowAY' ENGINEERING oomrANZ'iLrm;

ITED, OF HAMILTON, ONTARIO, CANADA CYLINDER CONSTRUCTION FOR TWO-CYCLE INTERNAL-COMBUSTION ENGINES Application filed November 23, 1928. Serial No.- 321,356.

The principal objects of this invention are to produce cylinders of the type in which two separate cylinders are joined by a head which forms a common combustion space 1 n which the weight will be reduced to the minimum and will be suitable for aeroplane engine construction.

The principal features of the invention consist in the forming of the cylinders separately, then welding them together in such a manner as to provide adequate seal for the common cylinder head which forms a common combustion chamber for the two cylinders.

In the drawings, Figure 1 is a plan view of the top of the cylinder head partly broken away and showing the top end of the umted cylinders.

Figure 2 is a vertical mid-sectional View through the line 2-2 of Figure 1.

In the construction of aeroplane engines it has been the practice to forge the cylinders and then machine the metal down to the minimum required thickness.

The cylinders A and B, the top ends of which are shown. herein, are constructed 1n the above manner. Thetop flanges a and b respectively and the radiating ribs 0 are flattened on a short chord X and the flattened edges are butted together and welded, thus joining the two cylinders securely together in parallel alignment.

V-shaped blocks D of the same thickness of the flanges a and b are fitted in between the converging edges of the said flanges where they are secured together in the weld and the meeting edges of the blocks D and the cylinder flanges are welded along the line d. These blocks extend the flange surfaces well beyond the bore of the cylinders and form with the cylinder flanges a continuous sealing surface extending around the pair of cylinders.

The cylinder head E may be of cast metal 5 and it is constructed of a substantially elliptical shape, having a flange e to rest upon the flanges a and b, the side portions extending across the juncture of the two cylinders extending over the Welded-in blocks D. This construction obviates any constriction of the chamber in inders.-

the head between the cylb. andthe volumetric capacity of the chamber a enclosed within the head above thetopsiof the cylinders is, figured in accordance with the diameter and displacement of the cylinders softhat when the pistons operating in the cylinders move to the top of the cylinders, the chamber will contain an explosive mixture of therequired pressure.

It will be noted that thellongitudinalarch of th'ecylinder heads terminates well inside the cylinder walls a andb so as to direct the flow of carburetted air from onecylinder. to the other in such a manner as to cause a verydefinite downward flow into one of the cylinders, which of course will be the cylinder,

having the exhaust port therein and the result is extensive turbulence. I

The joining of the two cylinders together in the manner described enables the use of the light construction of cylinder with a long elliptical cap while retaining the lightest possible weight of materials and a perfectly tight joint etween the cylinder head and cylinders wi 1 be obtained.

The Whole structure is extremely rigid and strong.

What we claim as our invention is 1. A cylinder construction, comprising a. pair of forged and machined cylinders having their head flanges welded together, closure blocks fitting between the converging edges of said head flanges and flush with the l pair of flanged cylinders arranged in parallel relation to each other having their head flanges flattened on one side abutting and welded together, a pair of V-shaped blocks inserted between and engaging the meeting peripheries of said flanges and welded thereto, a cylinder head having a wide flange extendin inwardly beyond the head'flanges of the c dinders, and an arched recess in the 5 undersi e connecting the two cylinders in a 30 fillet blocks inserted between said head anges and permanently welded thereto, and a com-' bustion head closing the head end of said cylinders and connecting their interiors.

5. An internal combustion engine cylinder as construction, comprisin a pair of cylinders parallellyarranged an having turned head flanges ermanently secured to ether in a welded oint and formin a contlnuous head i flange the minimum widt of which is greater so than the average bore of said cylinders, and

a-cylinder head spannin the ends of the two connected cylinders and sealed a ainst said continuous cylinder flange, said ead being arched to form a common combustion cham 35 her for said cylinders.

' HERALD B. GREENING. JAMES w. GALLOWAY'.

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