US1513190A - Engine - Google Patents

Description

WITNESS:

Filed June 2o, 1921 M. R. SMITH ET AL 2 Sheets-Sheet. 1

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mvENToR 5 Y 'I1-JIJ "Y o v. ArroRNEY et. Z8 1924.

M. R. SMITH ET AL ENGINE Filed June 20. 1921 2 Sheets-Shea. 2.

z' 771/; f y NVENTORS ATTCNEY Patented @et 28, i924.

nini stares fisiaiee i eers MILLARD ra. siriani Ann aten-nr 'n onere, oiy sri/innere, iowa.

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Application fiiea'iun i921. seiiairro. 479,009.

To @ZZ ifi/iam t 772,452/ concern.'

Be it known'tl'iat we, MILLARD B. SivriTH and finriinfr L. Canio', itizens of the United States, residing at Stanhope, in the county of Hamilton and kState of Iowa, have iiivented new and useful improvements iii liigines, of which the following is a specification.

rlhis invention relates to internal combustioiiv engines, wherein the cylindeisware arranged in pairs, and wherein one cylinder Vdepends upon the other for the suction and A compression of the explosive mixture, before the latter is conveyed from one cylinder into the combustionv` chamber` of the other cylinder. y .i

Another object of the Vinvention resides in providing la constructionA wherein the eX- plosive mixture is compressed twiceV before ignition, thereby providing` for a more periect combustion. Y

Another object of the rinvention resides in providing anA engine wherein the cams for operating the valves arev mounted direct upon the cani shaft of the engine, in which position they are subjected toy proper lubrication.

More specificallyy stated, the invention .minprehends an engine of the above inentioiied character lwherein eacli'cylinder has a relatively large and ai relatively small bore, with a piston operating w'ifthinthe sii/ialler-bore and of a length greater'than the length of said bore, the lower end of the piston being provided'witli a 'flaiige tightly engaging the wall of the large bore oi' the cylinder, and defining an intalieand compression chamber, wherein the explosive mixture is initially compressed before it is conveyed into the lcombustion chamber of the. adjacent cylinder.

In carrying out the invention, weprovide an Vintake and compression chamber in the manner above stated, of sui'iicient'dimensions to fill the combustion chamber ofthev tion will be better understood when lthe following detailed description is read in connection with the accompanying drawings, the invention residing in the construction, combination, and arrangement of partsV as claimed.

plug- V2ewhiclris threaded into the opening ln the drawings forming part of this apf plication, like numerals of reference indicate similar parts in the several views and wherein:

Figure 1 *is a vertical sectional view through the engine constructed in accord-1" A'ance with the invention.

'Figure j2f asectional view taken on line 2-2 ofFigure V'1.

Figure 3 is a similar view taken on line 3 3 of Figure 1. Y

Figure i isan enlarged fragmentary View, showing tiielrelative"arrangement of the intake and manifolds for the respective cylinders. H f

`Referring to kthe drawings in detail,` a'rpair of cylinders are indicatediat 10 and11 respectively, andv each'cylinder is formed to provide a small bore 12 anda large bore 13. A piston 14 operates within the small bore 12of each cylinder, and this piston is slightly longer than the bore 12, projecting within the large bore 13 `and, having an annular flange 15i whichr tightly engages vthe wall of said large bore 13. The flange is equipped withl a-packing ring16 as is also if* the piston 14 adjacent the upper endthereof, vthese packing rings being indicated at 17.

In Aproviding the large and small bores for each c-ylinder, a shoulder18 is pro-vided 'parallel with the-flange 15, thus formingflf a space between theiiange and shoulder 18 of each cylinderdefining anintalre and coinpressioii chamber 19.,k A' pitman 2O isicon- 90 necte'd with each piston and with the crank shaft indicated aty 21.` The pitman is confi nected with the piston by lmeans of a.Y wrist pin- 22, the latter being tapered zit-'both ends Yas at for the purpose o'f'talring up wear asthe occasion requires. This pin is, inserted from one side 'of the piston but does not project from the opposite side, the

iin 'beine' held 'inf iositi'on b lmeans 'of a rs v in the piston through which the pin is passed.' The pin maybe adjusted from time to time by turning the plug 24C to compen- Ysate for wear, and to prevent leakage into the crank case of the engine. 1,05

Each cylinder has an intake passage 25, whileboth of the passages havea vcommon inlet opening 26. Arranged in each passageV 25 is a valve 27 whiclicontro-ls communication between the inlet opening' 26 and the inlet and compression chambers 19 ofthe respective cylinders. The shoulder 18 ofV each cylinder has an opening 28 which establishes communication between the intake and compression chamber 19 of the particular cylinder and the intake manifold thereof. The intake manifold for the cylinder l() i's indicated at 29, While the intake manifoldl of the cylinder 11 is indicated at 30. The intake manifold 29 from the cylinder 10 opens into a horizont-ally disposed port 31 of the cylinder 11, while the intake manifold 30 from the latter mentioned cylinder opens into a similar port 32 of the cylinder 10. These ports 31 and 32 open directly into their respective cylinders, so as to establish communication between the latter and their intake manifolds. A valve 33 controls communication between the intake manifold 29 and the port 31, while a similar valve 34 controls communication between the intake manifold 8O and the port 32. Both of these valves include stems 35, and are opened and closed alternately through the instrumentality of cams 36 carried by the crank shaft 21.

The upper end of each cylinder is provided with an opening 37 for the reception of a suitable spark plug, and with an exhaust opening 38. The exhaust opening is normally closed by means of a valve 39 which is operated by the wellknown push rod 40 rocker 'arm 41 and a cam 42 iixed upon the crank shaft 2l.

Upon reference to Figure 1, it will be noted that the piston 14 of the cylinder 10 has about completed its compression stroke and Y about to fire, while the piston 14 in the cylinder 11 is moving along its power stroke and sucking Y a charge of explosive mixture through the intake port 25 into the chamber 19. This charge o-f fuel is trapped in the chamber 19 between the flange 15 and the shoulder 18, and when the piston in the cylinder'll moves to the position occupied by the piston and cylinder 10, the fuel just referred to is compressed in the chamber 19 :before it is conveyed through the intake manifold 29 into the combustion chamber of the cylinder 10. In the position of the parts illustrated in Figure 1, the combustion chamber 12 of the cylinder 11 is filled with the explosive mixture conveyed from the intake and compression chamber of the cylinder 10 to the position occupied in Figure 1. Consequently, the fuel is compressed twice before firing, `initially in the compression chamber 19 of one cylinder, and then in the combustion chamber of the adjacent cylinthat the fuel is initially introduced into` the intake and compression chamber 19 of the respective cylinders surrounding the wall of the pistons, when the latter are moving along their power stroke, and consequently the fuel is heated in the chamber 19 absorbing the heat from t-he piston and the Wall of the cylinder, which not only makes for a more combustible mixture, but which also tends to maint-ain the piston and cylinder at a more proper working temperature. It is to be further noted that the cams for operating the valves are all carried by the crank shaft and are disposed to be properly lubricated by the splash system generally vused in internal combustion engines.

W'hile it is believed that from the foregoing description the nature and advantages 'of the invention will be readily apparent, we desire to have it understood that we do not limit ourselves to what is herein large bores, valve controlled means for adv mitting fuel to the large bores, the latter bores being also provided with outlet openings, a pair of laterally extending castings carried by the upper ends of the cylinders and extended toward each other in transverse horizontal alinement, the castings being provided with valve seats in their upper faces and further provided with longitudinal passageways which communicate with the small bores of the cylinders, goose necks communieating with the outlets of the large bores and having their upper ends overlying the valve seat and communicating with the passageways in the castings, and reciprocable valves supported by the castings and movable ywithin the adjacent ends of the goose necks and adapted-to seat upon said seat.

In testimony whereof we aliix our signatures. i

uiLLAnn n. SMITH.k VALBERT L. CRAIG.

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