US1378333A - orevet - Google Patents

Description

E. DREVET. INTERNAL COMBUSTION ENGINE.

APPLICATION FILED MAR-24, I920. 1,378,333. P tented May 17, 1921.

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v APPuCATmM FAILED MAR 24, 1920. .1 ,378,333.

Patented May 17, 1921.

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APPLICATION FILED MAR. 24, I920.

Patented May 17, 1921.

3 SHEETSSHEET 3- /n yen for E. Dre I/ef M404 flfforney UNITED STATES EMILE DBEVET, OF MONTREAL, QUEBEC, CANADA.

INTERNAL-COMBUSTION ENGINE.

Specification of Letters Patent.

Patented May 17, 1921.

Application filed. March 24, 1920. Serial No. 368,399.

T 0 all whom it may concern Be it known that I, EMILE Dnnvn'r, a French citizen, residing at No. 58 1 St. Timothee street, in the city of Montreal, in the Province of Quebec, in the Dominion of Canada, have invented certain new and useful Improvements in Internal-Combustion Engines; and 1 do hereby declare that the following is a full, clear, and exact description of the same.

The present invention relates to improvements in internal combustion engines and the main object of the invention is to eliminate the vibration and increase the efficiency.

A further object of the invention is to provide a gas engine of this character that will be cheap of construction with easy access to the cylinders or other parts.

The invention will be better understood with the aid of the accompanying drawings, in which Figure 1 is a top view of the invention.

Fig. 2 is a vertical sectional view on line 2-2 of Fig. 1.

Fig. 3 is a cross sectional view on line 3-3 of Fig. 1.

Fig. 4 is a horizontal sectional View on line 44: of Fig. 2.

Fig. 5 is a top view of the base, crank shaft and other operating parts; the cylinders and pistons having been removed.

Fig. 6 is an inner view of the head casing of the engine disclosing the gas inlets and outlets.

Like numerals of reference indicate corresponding parts in each drawing.

Referring to the drawings 1 and 2 are the cylinders, preferably disposed in horizontal and parallel arrangement in relation to one another, each of said cylinders being open-ended and provided intermediate thereof with a semi-circular opening 3 which leads to a passage 1, and 5 is a head casing provided over said cylinders 1 and 2, and suitably secured thereto. Said cylinders are preferably provided with a water-jacket 6 which is adapted to commu nicate with the water-jacket 7 provided in the head casing 5, by means of the openings 8.

Each cylinder 1 and 2 is provided with a hole 9 in which is suitably secured the spark plug 10. Adjacent each end of said cylinders 1 and 2 is provided an opening 11 which is adapted to communicate with the base 12 on which is rigidly secured said cylinders. The open ends of said cylinders are preferably cut at an angle and are closed by the plates 18, said plates being provided with an embossment 14 in order to allow for the free action of the piston rods.

The head casing 5 is provided with the gas inlet passage 15 which communicates with the passage 1 in the cylinders 1 and 2 by means of a ports 16, and 17 is a main gas inlet which is adapted to communicate with the carbureter 18 by means of the gas pipe 19. The said head 5 is also provided with the exhaust passage 20 which communicates with the passage 4 by means of the ports 21, and 22 is the main exhaust outlet which is adapted to communicate with the exhaust pipe 23.

The inlet ports 16 are each preferably providedwith a vertically operating valve 24: that is suit-ably held in position by the springs 25 which are mounted on the stems 26 which project through said head 5 in suitable openings. The outlet or exhaust ports 21 are also provided with valves 27 mounted on the stems 28 which project through the head 5 and are held in position by the springs 29.

In each of said cylinders 1 and 2 are movably mounted two pistons 30 and 31 that are adapted to operate simultaneously in opposite directions, in their outstroke movement and operate in converging directions in their instroke movement. The said pistons are so adjusted that in their instroke they will come in alinement with the opening 3 provided in said cylinders. Each of said pistions 30 and 81 are provided with a piston rod 32 which is pivotally connected thereto, said piston rod being pivotally connected at its other end to the crank arm 33 which projects through said openings 11 and is rigidly mounted on crossed shaft 84, said shaft being journaled in suitable bearings 35 mounted in base 12. 36 is a crank arm rigidly mounted on the cross shaft 3 1 at one end and is connected to the crank shaft 37 at its other end by means of the connecting link 38.

The engine now described is one of the four-cycle type and the pistons work in pairs. For instance, the pistons 30 working together and the pistons 31 working together in opposite directions so as to counter-balance the other.

The crank shaft 37 is journaled in suitable bearings 39 and projects through said base 12. On one end of said crank shaft is mounted the fly-wheel 40, and on its opposite end is mounted a sprocket 41 which is adapted to co-act with the gear 42 mounted on one end of the cam-shaft 43 which also projects through the base 12.

The cam-shaft 43 is provided with a plurality of cams 44, the number of cams corresponding to the number of valves, each of said cams being adapted to contact with a head 45 provided on the lower end of the vertical stems 46 which project into said base 12 and are connected at their upper end to the cranks 47, said cranks being fulcrumed intermediate thereof on the brackets 48, and are connected at their other end to the stems 26 and 28 operating the valves 24 and 27. Said cams are so adjusted as to operate the valves 24 and 27 at suitable intervals.

The operation of the pistons 30 and 31 is readily understood from the drawings particularly Figs. 2 and 4 and it is clear that the vibration will be eliminated to a great extent owing to the balancing type of the engine, and further a most important feature of this invention resides in the fact that the pistons can easily be removed from each side without having to completely knock down the engine. For instance, when this engine is mounted on an automobile chassis, if anything happens to it, access can readily be had to the cylinders by removing the plates 13 on each side, thus saving considerable time and expense; while in ordinary gas engines access to the cylinder is rather diflicult and a lengthy operation.

Another important feature of the present invention resides in the fact that the crank shaft will receive an even and simultaneous pressure on each side, counter-balancing the vibrations caused by the movement of one piston by the other and further lessening the tear and wear on the engine, thus eliminating ovally-formed cylinders, as thepiston rods are practically always kept in a parallel line in relation to the walls of the cylinder.

Another important feature is that an engine of this character will be rather low on the chassis thus lowering the center of gravity and providing for better equilibrium. Further, although there are four pistons, only two spark plugs and four valves will be required, thus lessening a lot of trouble "caused by a plurality of these elements, which are susceptible of causing improper ignition or allowing insufiicient quantity of gas, etc.

It will very easily be seen from the foregoing description, that a gas engine of this character will be quickly knocked down by removing the pin connections between the piston rods 32 and the cranks 83 and by re moving the bolts securing the cylinders to the base 12.

What I claim as my invention is 1. An internal combustion engine comprising a base; a horizontal cylinder having open ends mounted on said base; remov able plates adapted to close said open ends; an opening on one side of said cylinder in which is secured a spark plug; a central opening in said cylinder; a head casing mounted on said cylinder; an inlet port in said head communicating with said central opening in said cylinder; an exhaust port in said head communicating with said central opening in said cylinder; a vertically operable valve in said inlet and said exhaust ports; pistons movably mounted in said cylinder adapted to operate in opposite directions; a crank shaft suitably journaled in said base; means to connect said pistons to said crank shaft; a camshaft mounted across said base; cam-members mounted on said shaft; means to actuate said shaft; and a vertical connecting rod connected to each of said valves; said connecting rods being adapted to contact with each of said canimembers; substantially as described.

2. An internal combustion engine comprising a base, horizontal cylinders having open ends mounted on said base at suitable intervals from one another; removable plates adapted to close said open ends; an opening on one side of each of said cylinders in which is secured a spark plu a central opening in each of said cylinders enlarged on the outer side of said cylinders to form a recess; a head casing mounted across said cylinders; inlet ports in said head communicating with said recesses in each of said cylinders; exhaust ports in said head communicating with said recesses in said cylinders; vertically operable 'alves in said inlet and exhaust ports; pistons movably mounted in said cylinders adapted to operate in opposite directions; a crank shaft suitably jcurnaled in said base; means to connect said crank shaft to said pistons; cam-shaft journaled across said base; cam-- members mounted on said cam-shaft; means to actuate said warn-shaft; a plurality of vertical connecting rods projecting in be tween said cylinders on each side thereolconnected to each of said valves, said connecting rods being adapted to contact with each of said cam-members, substantially as described.

Signed at Montreal, Quebec, Canada, this 1st day of March, 1910.

EMILE DREVET.

lVitnesses M. DENYS, C. PATENAUDE.

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