US1118521A - Mechanism for varying the stroke of internal-combustion engines. - Google Patents

Description

W. M'. AUSTIN. MEOHANISM FOR VARYING THE STROKE or INTERNAL GoMBUsTIoN ENGINES.

N -APPLIOATION FILED DBO.30.1912.

Patented Nov. 24, 1914.

'gli ESSS 'g' XVALTER M. AUSTIN, OF SWISSVALE, IJSNNSYLVANIA.

MECI-IANISllf' FR 'VARYINGr THE STOKE OF INTERNAL-COMBUSTIUN ENGINES.

amener.

Application len December 30, 1912.

To 0U Lc/mm it Way concern Be it known that lVALTnn M". ims'rm, a citizen of the United Stfites,nesi li1ig at Swissvale, in the county of Allegheny and State ot' Pennsylvania, have invented new and useful ln'iprovenients in Mechanism 'for Varying the Stroke of Internal-Coniloustion llngines, ol which the following is a specification.

This invention relatos to internal cornbnstion engines of the type in which the combustible fluid mixture is compressed before ignition.

The principal object of my invention is to provide an iniproved internal combustion engine in which the products of con1- bastion are completely expelled .from the working cylinder before the introduction of a fresh charge ot' combustible mixture and in which an increased expansive effect is secured Afor a given volume of combustible mixture.

lin an internal combustion engine it is highly desirable to thoroughly scavengo the working cylinder et the products oi com bustion so as to prevent contamination ot' the fresh charge of combustible mixture which is drawn in on the next stroke o't the engine for various reasons well knwn t0 those skilled in the art and which the e fore need not he enumerated here. By providing a larger etilective expansion volume more power is secured 'trom a given charge o't fuel.

In the accompanying drawing; Figure l is acentral verti'ail section oi a six cylinder internal combustion engine embodying my improvements; Fig. 2 a top plan view ol.' the crank shaft therefor; Fig. 3 a section through the crank shaft on the line ro-uot Fig. l, looking in the direction of the arrows; Fig. Al a, similar section on the lint` om?) oil Fig. it; Fig. 5 is a Similar section on the line (rw-o ot Fig'. 1; Fig. G an end View ot the .main crank shaft looking at the right hand end; and Fig. 7 a section' of the main crank shaft on the line fl-d o'fFg. 1.

The invention is adapted to be employed -with internal combustion engines having;V

two or .more workingr cylinders and as an instance ot' one lapplication of my invention7 l have shown and described the Same as applied to a six cylinder' engine.

7 As shown in Fig. 1 of the drawing, the

usual engine casing l is provided having Specification of Letters Patent.

"atcnted Nov. 24, 19146.

Serial No. 789,238.

.cylinders 2, 3, Ll, 5, (3, and 7 containin f the rods 14, l5, '1(3, 1718, and 1.9. A main vcrank shaft l0 is joi-lrnaled in hearings in the engine casini;y 'l and has crank pins 21, 22, 24, and 'tor the respective connecting rods lat, l5, 1S, and 1t), the connecting rods i6 and 'i7 beingr applied to a common crank pin 23. lhe crank pins 21 and 25 a're in a..ial alincment as also the crank pins 22 and 24, and the pairs of crank pins so formed are spaced 12d degrees apart. Intermediate the crank pins 22 and 2.3 and 512i and Qt the crank shaft is provided with bearing members QG and Q7, preferably ball bearings, and said bearing members may either be integral withthe crank shaft, as shown, or may be suitably secured thereto. 0n opposite sides of the bearing members Qt and 2T are elongated bosses 28 which extend -from the crank pins and it to the crank pin i3 md form with the nternuuliate bearing member the crank portion 'tor said crank pins, as more clearly shown in Figs. 2 and 7.

The connecting rods are not mounted directly on the main crank shaft but have intermediate auxiliary cranks or eccentrics, the connecting; rodslfi, 15, 18, and 19 being rotatably mounted on the respective auxiliary cranks QS), 30, 31, and 32 and the connecting rods 16 and 17 being mounted on auxiliary cranks 33 and 34 integrally connected together as shown.

The engine arranged so that the conipigession and expansion strokes of one en- 4niddle pair of pistons 10 and '1,1 have the corresponding auxiliary cranks 33 and 34 integrally connected together with the ecccntricity of the cranks arranged substantially 180 degrees apart, the double crank being preferably :Formed in halves, as shown in Fig. 3, and secured together on the main crank shaft by bolts (not shown). The auxiliary cranks .for the respectivo connecting' other pistons are similarly arranged, baul-ln Cillin THON, Y

he l@ zum au. u

if; the en- 7x7 *he Same nummer., by

3 mason A Jim1 batw i the cranks The main Crank q d :Lugli-Haga a fem balance as ma ee-Jnicmas 0i vides@ m the usual six Ender engine subsanalj 180 :le :m for the same reason pe' to ispose is ahw the ma* with 'the ha piston?. as Shown; a middle pair, and 'the Stemmi pai? with a piston on either side Sucicx. SMG? mi p f desl'e, however, tha paifs me s v ali be arrangfad the Same as 'fh is apen o 'he iiotwnion @i 'the integrally lary cranks and s@ L an interna?. combustion engine, the combinm n Wh *Emu* cylinders, a piston in each cyhme'f, a @um i shaft provided with cfentml azanx pin and a crank pin im @am Side of the central @rank pin, zmc connecb ing ms fm* @pelatively connecting the two uppermost position. This' said gears.

2. In an internal combustion engine, the combination with a Iplurality of cylinders, a piston in each cylinder, a. crank shaft provided with crank pins, and connecting rods for operatively connecting said pistons to crank pins, ofan eccentric mounted on the outer crank pin at each side, a gear secured to each eccentric, an internal gear 4meshing IWith'each eccentric gear and carrying an external gear, gears meshing with sa1d external gears, and a shaft for connecting the last mentioned gears. 3. In an internal combustion engine, the combination with a plurality of cylinders and a iston in each 'c linder, of a main crank s aft, two integra ly connected auxiliary cranks rotatably mounted on the main crank shaft, a connecting` rod for operatively connecting each auxiliary crank ywith one of the pistons, other auxiliary cranks, trains of gea ring :for operatively connecting the last mentioned cranks in pairs, and a connecting rod for operatively connecting h each of said cranks with one of the remaining pistons.

4. In an internal combustion engine, the combination. with a plurality of and a iston in each cylinder, o a main crank s aft, two integrally connected auX- iliary cranks rotatably mounted on the main crank shaft, a connectingrod for operatively connecting each auxiliary crank with one of the middle pairs of pistons, an aux-` iliar crank rotatably mounted on the main shaft on opposite sides of the middle pair of auxiliary cranks, gearin for opfcylinders eratively connectin the second pair of auxiliary cranks, a tiird pair of auxiliary cranks rotatably mounted on the main crank shaft on opposite sides of the second pair of auxiliary cranks, gearing for o erativelyconnecting the auxiliary cranks ot the third pair, and a connecting rod for operatively connectin each auxiliary crank of the sec ond and tii'rd pairs with a piston of the eneine.

b In testimony whereof I have hereunto set my hand.

\VALTER M. AUSTIN. Witnesses:

A. M. CLnMnNTs, B. A. OLIVER.

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