US1442822A - powell - Google Patents

Description

Jan. 23,19%, 1,442,822

' INTERNI: ENGINE. I

Fl LED DEO. 24. 1920.

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Patented Jan. 23, 1923 UNITED STATES PATENT Qf'fil.

ALVAH L. POWELL, OF MILES CITY, MONTANA, ASSIGNOR TO THE A. Ii. POTWELL POWER C0., OF IVIILES CITY, BIONTANA, A CORPORATION.

INTEBNAL-COMBUSTION ENGINE.

Application filed December 24, 1920.

.To aZZ wzi-0m it may conoera:

Be it known that I, ALVAI-I L. PownLL, a citizen of the United States, residing at Miles City, in the county of Custer and State of .LVlontana, have invented certain new and useful Improvements in Internal- 'Combustion Engines, of which the following' is a specification.

My invention relates to improvements in internal comhustion engines in which I provide means for automatic mechanical ignition, and for effecting the ignition at a point in the stroke most favorable to power development. This application accompanies another filed simultaneously, and bearing the Serial Number 433,033. The machine herein described follows: the lines of construction shown in my other application but embraces variations that I desire to cover.

In the annexed drawings Fig. 1 is an elevation, in section, of a two cycle engine equipped with my improvement.

Fig. 2 is a section taken on the line 2-2.

Fig. 3 is a diagram of the power stroke.

Fig. 4 shows the cam and gearing necessary when the improvement is used on a four cycle engine.

In Fig. 1, the cylinder A of a two cycle gas engine has a piston C6, conventionally fitted to piston rod and crank to transmit power to a. shaft, C7. Proper inlet and outlet, operable, valves are shown at A7, A8. On the upper side of cylinder A there is a cylindrical chamber in which is fitted a slidable piston, A2. This piston has, at one end, an automatic inlet check Valve K. VA2 terminates in a tongue to which is fitted an arm of a bell crank, D3, the latter` pivoted to any convenient point in the engine frame. Piston A2 is hollow, and in the cylindrical space so formed there is a second piston K1. This is stationary on a pin, K2, that is held in position by a plate K3 on the opposite side of cylinder A. It is evident from the construction, that a reciprocatory movement of the piston A2 will result in compression being effected within it during a forward movement; that is, a movement towards the cylinder A, but on reversal a vacuum will be formed and air will be drawn in through the valve K. Inlet grooves of a proper'len h to assure access of air are shown at On compression .stroke of piston A2 the compressed air is Serial No. 433,034.

forced through an opening shown. at K5, by which the said air passes into an annular space, K, in which it is retained during' part of the stroke of A2 by the wall of the latter and the ball K7. This ball seri-es'as a check valve under the conditions about to be described. On one side of the ball K7 a sheet of Wire gauze is preferably placed (K8) to act as a fiame screen.

Let it be assumed that piston C6 is at upstroke, on compression. A cam, D on power shaft is just engaging the bent end of rod D1, that is suitably attachecl to the bell crank D3. It will be observed that the face of the cam, that is, the length of said face equals the length of the arc a 7.` As the crank rides over the space o (Z the vertical movement of piston is small, but during this interval the cam D will be operating the bell crank D3 which, in turn, will cause the secondary piston A2 to move in- Ward towards center line of piston O. The stationary piston K1 will act as a compressing member within piston A2 and the contained air will be compressed, passing through hole K5 while the latter is moving over annular space K6. The position of piston C6 will cause it to act as a cut-off to the passage occupied by the ball K7, and the compressed air in said passage will be retained. As piston C6 starts out on power stroke, but before ignition, compression tends to fall, but piston A2 advances simultaneously, compensating for the loss due to movement of O6. As C6 uncovers the hole at M of passage K the compressed air in the annular space will push aside the hall K"I and enter the main combustion chamber. This will be efected at a point of crank movement indicated by d. The relative space and movement being proportioned for high compression of the annular charge its ingress to the main cylinder will be at ignition temperature. The air and gas in said main chamber will, therefore, be fired, piston CG moving downward, transmitting movement to the crank on the are de (Fig. 3). The arc d-e is the ideal line of movement for the crank pin and on traversing it maximum power will be transmitted to the shaft C7.

I also show an electric ignition plug at M1. This can be' used in an engine using lower compression, although applicable to the high compression Itype as well.

In this case the pin ,K2 would be removed,

a plug being introduced in end of piston K1, and the cover K3 put back in position as shown in K3. Compression within A2 Will no longer take place under these conditions,

but the pressure compensating action of 'A2' With reference to the movement ofC6 would remain the same.

I do not limit myself to the exact construction herein shown. and ask to have protected by Letters Patent,

Claim.

In a gas engine. the combination of powerV means) secondary compression means for maintaining compression, mechanical means VVhat believe is new` rod and bell crank to transmit said camV movement to a secondary piston operated by said crank rod, a valve in said secondary piston, a minor piston within said secondary piston, a Chamber to hold highly compressed air, a valve in said Chamber, means for releasing said secondary compressed air into main cylinder for ignition purposes, and means for transmitting primary piston power to a crank shaft, substantially as described. i

In testimony whereof I atfix my signature;

ALVAH L. POWELL.

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