US1239224A - Two-stroke combustion-engine. - Google Patents

Description

Patented Sept. 4, 1917.

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TWO-STROKE COMBUSTION ENGBNE.

APPLKCAHN FILED DEC. l0. 1914i S www f/ y@ i, v

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RUDQWIST, 0F MUNICH, GERMANY.

TWO-STROKE COMBUSTION-ENGINE.

Specification. of Letters Patent.

Patented Sept. 4, 1917.

t Application led December 10, 1814. Serial No. 876.411.

To all whom it may concern.'

Be it known that I, CARL RUDQWIST, a citizen of the Swedish Kingdom, residing at Munich, Bavaria, Germany, have invented certain new and useful Improvements in Two-Stroke Combustion-Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and` use the same. v

This invention relates to a two stroke cycle combustion engine embodying improvements for enabling the engine to be employed as a high speed engine.

In connection with a two stroke cycle combustion engine having a step piston, it is necessary,-while the air is being compressed in the combustion cylinder, to store the scavenging and charging air until the piston has uncovered the channels, Which establish communication between the air chamber and the combustion cylinder. The connecting channel between the air pump and the air chamber is frequently shut off by valves, which open when the pressure in the air puni is higher than in the chamber and close when the pressure is lower. Experience has, however, Shown that these valves have many disadvantages.

The object of the present invention is to obviate the above-mentioned drawbacks.

A combustion engine constructed according to the present invention is shown in the accompanying drawing.

Figure 1 is a longitudinal section.

Figs. 2 and 3 show the distributing member A in different positions.

'Ther distributing member consists, as shown in Fig. 1, of a cylindrical slide valve. A", which derives its reciprocatory move,- lnent from an eccentric B and is, provided with admission ports P P1 and with controlling ports S, C, H; a valve D is provided between the controlling ports C and H and the chamber E .is closed above by a valve R.

The eccentric B is disposed relatively to the crank in such a manner that during the compression stroke the distributing member A establishes communication between the step piston pump and the chamber ll (see position Fig. 2), the crank being horizontal and the piston having its highest speed. In the end position of t piston (middle position as shown in Fig. l), the

distributing member A has shut ofi' the suction ports Il and Prand it is only when the air pump-begins to compress the drawn in air, that the passa e leading to the air chamber is opened t rough the medium of the controlling port S.

It is obvious from The position as shown in Fig. 3' that the port S of the air` chamber F is closed during the complete suction stroke of the air pump. It is also obvious from Fig. l that the connecting channel and the valve top' can be formed as air chambers I"1 and E.

It is finally also obvious from the drawings how the air supplied by the air pump is separated into two parts by the distributing member and the valve 'D respectively 'l'. e.

`one part for scavenging andanother part for charging the Aworking cylinder. This is ell'ectcd by closing the channel (l (Fig. -2) during the complete compression stroke. The air for charging passes through the valve D into the chamber E, while the air for scavenging the working cylinder remains in the chamber F. As the scavenging air must not enter the combustion cylinder uuder the same high pressure as thc charging air, the latter is led through the port C, after the compression stroke?, out of ldie air chamber' F to the chamber F Where it is stored and reduced to the desired pressure. When the piston has uncovered the port G in the combustion cylinder, thc working cyl-v inder is scavenged by the air contained in the chamber F and chamber F1, respectively. When the piston shuts oil' the exhaust port (L, the port Il in the distributing member is opened and the air stored in the air chamber E passes through the channel Ill into the cylinder.V M is a noir/.le through which fuel is sprayed into the engine cylinder, and W, W are the bearings for the en- Although I may use any suitable ignition device, to ignite the mixture of fuel and air within the combustion space of the engine cylinder, I have shown a special form of ignition device which consists of a hollow metallic body at the head of the cylinder surrounded by an electric heating coil Z. The latter is provided with terminals N, N', for connection to a suitable source of electric current. The ignition device is preferably so positioned as to be surrounded by the water-jacket of the engine cylinder.

In order to maintain a good piston pin' f said valve casing into a -ing lubrication in a simple, economical and yet perfect manner, which was hitherto always a difficult task in connection with a vertical motor, the step piston is formed as a trough and the piston pin K (Fig. l) is provided in the piston with a bore and is fitted in such a manner that the oil dropping from the upper cylinder flows in the direction of the arrow to the piston pin bearing through the bore in the piston pin.

1. In a two stroke cycle combustion engine, the combination of an engine cylinder having a combustion chamber and a pumping chamber therein, a valve casing supported adjacent said engine cylinder and having port openings communicating, respectively, with said combustion chamber and said .pumping chamber, a valve slidable in said valve casing, said valve having ports therein adapted to register with the port openings in the casin means dividing said valve casing into a jacent chambers and permitting passage of air from one chamer to the other in but one direction, and

means for reciprocating said valve to successively' cause the ports therein to register with the port openings in the valve casing, whereby a charge of scavenging air first passes from one of the chambers'in the valve into the combustion chamber and thereafter a second charge of air for admixture with fuel passes from the other chamber in the vai-ve into said combustion chamber.

2. In a two stroke cycle combustion enine, the combustion of an engine cylinder lgiaving a combustion chamber and a pump- 4ing chamber formed therein, a valve casing supported adjacent said engine cylinder and having air admission port openings in communication with said pumping chamber, said valve casing also having a port openin communication with said combustion chamber and an intermediate scaven ng air port opening therein, a valve sli able in said valve casing and having plorts adapted to register, respectively, with te port o enings in said valve casing means divi ing djacent chambers and permitting passa of air from one chamber to the otherA in but one direction, and means for reciprocating sai'd valve ,to successively cause the ports therein to regia ter with the port openings in the valve casing, whereby a charge of scavenging air first passes from one of the chambers in the valve into the combustion chamber and thereafter' a sei-,ond charge of air for admixture with fuel passes from the other chamber 1n the valve into said combustion chamber.

3. Ina two stroke cycle combustion enchambers, said valve having gine, the combination of an engine cylinder havin a combustion chamber and a pumping c amber therein, a valve casing supported adjacent said engine c lindor," said casing having a pair of air adinission port openings therein communicating with said pumping chamber, an intermediate scavenging-air port opening leading to said combustion chamber and an air emission port opening communicating with said oombustion chamber, a valve slidable in said casing and having adjacent chambers therein, means for entrapping air in one of said ports therein adapted to register, respectively, with the port openings in said valve casing, and means for reciprocating said valve to suc cessively cause the ports therein to register with the port openings in said valve casing, whereby air entering the valve casing through said admission port openings flows through the scavenging-air port opening into the combustion chamber and thereafter the entrapped air flows into said combustion chamber through said air emission port opening.

4. In a two stroke cycle combustion engine, the combination o an engine cylinder havine a combustion chamber and a. pumping chamber therein, a v'alve casin supported adjacent said cylinder, a` v ve in said casing divided 'into adjacent chambers, means for entrapping air in one of said chambers, there being air passages between said valve casing and said engine cylinder, and means for reci rocating said valve whereby a charge o scavenging air first passes into said combustion chamber and thereafter the entrapped air passes into said combustion chamber to admix with fuel therein.

5. In a two stroke cycle combustion engine, the combination of an engine cylinder having acombustion chamber, a pumping chamber, ,and an intermediate pressuiereducing Ychamber therein, a valve casin supported adjacent said cylinder, a va ve in said casing divided into ad3accnt chambers, there being air passages between said valve casing and said engine cylinder, and means 4for reciprocating said valve whereby a charge of scavenging air first asses through said pressure-reducing cham er into said c.nnlmstion chamber and thereafter the entrapped air passes into said combustion chamber to adinix with fuel therein.

In testimony whereof I hereunto aix my signature in thel presence of t'wo witnesses.

CARL RUDQWIS-T.

, Witnesses:

N. Rennen,

VICTOR GUGGENBERGER.

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