US1212779A - Starting mechanism for multicylinder internal-combustion engines. - Google Patents

Description

0. LASCHE.

STARTING MECHANTSM TOR MULTTCYLINDER INTERNAL CoMBusTloN ENGINES.

-MPLICATlN FILED FEIT-17.1915.

Patented Jan. 16, 1917.

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Witnesses -To ullwhom it may concern f UNITED 'STATES PATENT OFFICE.

OSKAR LSOHE. OF CHARLOTTENBURG, GERMANY, ASSIGNOR TOGENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

STARTINGMECHANISM For. MULTICYLINDER I'NTERNALCOMBDUSTION ENGINES.

Application filed February 17, 1915. Serial No. 8,718.

Be it known that I, Osiian Inscris, a subject of the King of Saxony, residing at Charlottenburg, Germany, have invented certain `new and useful Improvements in Starting Mechanism for Multicylinder Internal-Combustion Engines, 'ot which the following is a specification.

-The present invention relates to multicylinder internal combustion engines of the high compression type, in which the scavenging or charging air is furnished by a suitable pump driven by the engine.

The object of the invention is to provide an improved arrangel'nent for starting such engines.

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

I the accompanying drawing Figure 1 a longitudinal section of a multi-cylinder combustion engine; Fig. 2 is a cross-section on the line .Q -2, IVig. 1; Fig. 3 is 'a top plan View, and Fig. 4 shows a modication.

The Working cylinders 1, 2, 3 and 4 each contain two opp'ositely moving pistons 5, G, which act on the same crank shaft,-the' upper pistons controlling the exhaust ports and the lower pistons the scavenging or air charging ports 8, to which air isadmitted from the receiver 9. The scavenging pump 10 delivers air into the receiver 9 through the valvesI 11. A

The exhaust ports 7 are. connected with a common header or manifold 12 by the branch pipes'13. Some ot' these, for example the two from the cylinders 3 and 4, are provided With throttle valves 14 by means oli which the pipes can be entirely opened or closed or more or less throttled. The valves ymay be operated 'by a hand lever 15 connected 'by rods 16 with arms 17 on the valve spindles. The other cylinders, that is in the present instance the cylinders 1 and 2, are also provided With valves 19 for introdliicing compressed air for starting the engines. All the Working cylinders are provided with fuel injectors 18.

The operation is as follows: Compressed air is admitted to the Working cylinders 1 and 2 by the-starting valves 19 at the proper intervals, while at the same time the exhaustor closed by Imeans of' the valves 14. The

compressed air in the cylinders l and 2,

Patented Jan'. 1e, 191'?.l

u pipes the cylinders 3 and 4 are throttled transmits its motion to the pistons in the cylinders 3 or 4, and also to the piston of the scavenger pump 10, and accelerates them uniformly. The air discharged by the pump into the receiver 9 rises in pressure during the periodof starting,A thereby also raising the compression temperature in the Working cylinders to a vpoint above that attained dur-- ing normal running, because the scavengin air, which in quantity is sufficient for al four cylinders, is now used only in two of them, 1 and 2, by reason of the throttling of the exhaust from the other two, Sand 4. Consequently, only; partl of the air can escape, and the' remainder increasesin pressure and becomes'` highly heated.

IVhenever the scavenging ports of the cylinders 3 and 4 are opened, highly heated air .from the receiver enters said cylinders so that in a short time a final. compression temperature attaned therein suflicientlyA high for '(aperation with fuel. It will be noted that since the exhausts of the two cylinders are throttlenil while starting, their contents are not rel'ilaced. on each successive cycle by air from the receiver, but that on successive strokes `the same air is compressed, a little more air being added to it from the receiver, tlulsu'aising its initial pressure according to the pressure in-the receiver. This air will be added since the receiver pressure will be slightly above the cylinder pressure at the time when the scavenging ports open. As soon as tliese cylinders begin to fire, their exhausts are opened, by tru-ning the valves 14, and coincidently therewith the supply of compressed starting air is shut'o' by valves 1!) from the cylinders l and 2, and fuel is injected, either immediately or after a few where a spring 20 is interposed in the line of transmitting elements. A nut 21 enables the tension of the spring to be adjusted.

In acordancevvvith the provisions of the patent statutes, I have described the princi- 'ple of operation, of my invention, together with the apparatus which I now consider to represent the best embodiment thereof; but I desire tofhave it understood that the apparatus shown is only illustrative, andthat the invention can be carried other means.

What I claim as new and ydesire tofseciir'e' by Letters Patent of lthe United States, isf-` 1. 'In an internal combustion en ne, the

- combination of a-pluralityof cylin ers fhav ing exhaust and scavengingportsya receiverk communicating with the scavenging ports,- fuel admission means, valveV means for supy plying starting air .to some of said cylinders,

'and means' for throttlingmor closing the exhausts of the other starting period..

2. In a 'highcompression internal com;

bustion engine, Vthe combination of a plurality of cylindersfhaving exhaust andscavenging ports, a common receiver communiyeating with the scavenging ports of al1 the cy1inders,a pump for supplying-,aiuto the receiver, an exhaust manifold, pipes c on-` *theother cylinders... In witness'whereof, Ihave i my hand' this 18th lday'of January, 1915;

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v30 necting the exhaust ports'theretm-air starti ing valves connected wlthv some of said 'cylrLinders, and shut-,01T valves'inthe ofr als 4

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