US1246121A

US1246121A - Twin-cylinder engine.

Info

Publication number: US1246121A
Application number: US87412114A
Authority: US
Inventors: Hermann Lemp
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 1914-11-27
Filing date: 1914-11-27
Publication date: 1917-11-13
Anticipated expiration: 1934-11-13

Description

H. LEMP.

' TWIN CYLINDER ENGINE.

APPLICATION FILED NOV. 27. 1914.

1 ,246, 1 2 1 Patented Nov. 13, 1917.

\gitness 5: U Inventor":

Hermann Lem Hisa ttorne q.

jector 13 of any suitable type.

UNITED PT HERMANN LEMP, 0F ERIE, PENNSYLVANIA, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

TWIN-CYLINDER ENGINE.

Specification of Letters Patent;

Patented Nov. 13, 1917.

To all whom it may concern:

Be it known that I, HERMANN LEMP, a citizen of the United States, residing at Erie, county of Erie, State of Pennsylvania, have invented certain new and useful-Improvements in Twin-Cylinder Engines, of which the following is a specification.

The present invention relates to twin cylinder engines and more especially to those of the internal combustion two-cycle type operating on the high compression plan wherein both pistons are operated from a single crank on the main shaft.

In such arrangements one of the piston rods is connectedto the crank and the other is connected to the first rod so that both move to ether.

Theo ject of my invention is to provide an. improved arrangement in an engine of the above mentioned type.

For a consideration of what I believe to be novel and my invention attention is directed to the accompanying description and claims appended thereto.-

In the drawing is shown a twin cylinder internal combustion engine in vertical section.

The cylinders 1 and 2 are vertically disposed, although this is nota necessary feature of my invention. They are arranged in parallel relation to each other and are connected at the top by a shallow combustion chamber 3 so that combustion in both'cylinders takes place simultaneously. The cylinder 1 is provided with one or more scavenging ports 4 and cylinder 2 with one or more exhaust ports 5, the former ports being controlled by the trunk piston 6 and the latter by the trunk piston -7. Surrounding the scavenging ports is a chamber 8 that communicates with the receiver 9 by a vertical passage 10. Any suitable means may be provided for maintaining a suitable air pressure within the receiver. The exhaust ports are connected to the exhaust conduit 11 by a suitable passage 12. Fuel is admitted to the center of the combustion chamber by an in- In the one shown fuel is delivered to the injector b a pump and high pressure air injects the uel when the valve opens. The manner and direction of injecting fuel is not material to the present invention.

14 indicates the main shaft that is supported in suitable bearings 15 of which one is shown. The shaft has a crank 16. One of the pistons, as 7 for example, is provided with a connecting rod 17, the upper end of which is secured to the piston by the wrist to extend into the combustion chamber for a short distance on their compression stroke so as to reduce the volumetriccapacity of the chamber to the end that the temperature of the compressed air therein will be raised to a point above the ignition temperature of the fuel admitted by the injector. This is accomplished by making the outer ends of the pistons conform approximately to the shape 8f the end portions of the combustion cham- In order to permit the successful use of a shearing pin, it is necessary that the angular motion of the connecting rod on this pin be negligible. To accomplish this result I have found that the shearing pin should be so located with reference to the crank 16 and wrist pin 21 that when the pistons are symmetrically located at the inner or outer end of their strokes, the centers of the crank 16, shearing pin 22 and wrist pin 21 are in line with each other, as shown by the dot-anddash line. From actual experience and practice, I'havefound that with this relation there is substantially no angular motion around the shearing pin.

The direction of rotation of the shaft 14 in the arrangement shown is clockwise and due to this arrangement the piston 7 controlling the ,exhaust ports 5 will lead the piston 6 controlling the scavenging ports 4 as is desirable in this type of engine.

It will thus be seen that by my improved arrangement I obtain a structure which pro vides a common combustion chamber for the two cylinder-sand gives the desired lead of the one piston over the other; while at One combustion space thus insuring a very thorough scavenging of the cylinders and the combustion space.

In accordance with the provisions of the patent statutes, 1 have described the prin-, ciple of operation of-my invention, together with the apparatus which I now consider to represent the best embodiment thereof; but I desire to have it understood that the apparatus shown is only illustrative, and that the invention can be carried out by other means.

What I claim as new and desire to secure by Letters Patent of the United States, is,-

In a high compression two-cycle oil engine, the combination of a pair of similar cylinders arranged side by side in parallel relation, exhaust ports formed in one cylinder wall, scavenging ports formed in the other cylinder wall, the ports being located in the same transverse plane, a receiver independent of the crank chamber that contains compressed air and communicates with the scavenging ports, a shallow combustion chamber which is common to both cylinders and into which the pistons extend on their compression stroke to highly compress and heat the air therein, the products of combustion and scavenging air flowing through the cylinders and chamber in series, a fuel injector located in the combustion chamber and delivering fuel to the central part thereof, a trunk piston in each cylinder which controls its ports and has a wrist pin, a crank shaft, a connecting rod which connects the wrist pin of one piston with the crank on said shaft and has an ofiset near its inner end, a shearing pin supported by said ofi'set, said pin being located in a plane passing through the center of the crank and the center of the wrist pin of the second piston,',and a rod connectmg the shearing pin and the wrist pin of the second piston whereby the pistons move simultaneously but one of the pistons opens the exhaust ports in advance of the scavenging ports and closes them before said latter ports are closed by the other piston.

In witness whereof, I have hereunto set my hand this twenty-fourth day of November, 1914.

HERMANN LEMP.

Witnesses: v

Orro F. Pnnsson, Q, 'l. Fonom.