US1168877A - Two-stroke-cycle internal-combustion motor. - Google Patents

Description

^ W. FRGEHLICH.K

y TWO-STROKE CYCLE INTERNAL COMBUSTIN MOTOR.

, APPLICATION FILED .IAN-26,1915. 19168987?, Patented Jan.1s,1916.

2 SHEETS-)SHEET l.

. l W. FROEHLICH. TwoLsTnoKE CYCLE INTERNAL cpmpusloN Moron.

APPLICATION FILED IAN26 19I5 Patented Jan. 18, 1916.

A 2 SHEETS-SHEET 2.

v Y Mfr/wg.

WILHELM FROEHLICH, OF WANNSEE, EAR BERLIN, GERMANY.

TWO-STROKE-CYCLE INlI'ERNAL-COMBUSTON MOTORI'.

meseta.

Specification of Letters Patent.

Application led .Tanuary26, 1915. Serial No. 4,558.

To all 'whom t may concern:

Be it knownl that I, WILHELM FRoEHLroH, a subject of the King of Prussia, residing at l1 Tristanstrasse, Wannsee, near Berlin, Germany, have invented certain new and useful Improvements in Two-Stro'ke-Cycle Internal-Combustion Motors, of which the following is a specification.

My invention relates to internalcombustion motors working in a two-stroke cycle, and more especially to the type of motors with a number of cylinders arranged parallel to each other around a hollow central shaft.

According to my invention the hollow shaft serves as' an intermediate receptacle for the scavenging air and for the gas and air mixture. It further serves asa distributingtvalve for the admission of the scavenging air and the mixture to the cylinders and for governing the feed pumps drawing in and compressing the air and the mixture. The shaft therefor directly governs the suction and compression channels ofthe air and mixture pumps and the admission channels as well as, by aid of cams and annular valves, the exhaust channels ofthe cylinders.

The drawingsv aflixed to thisspeciication show the preferred form of a motor according to my invention.

Figure 1 is a vertical longitudinal'section on the line K--L (Fig. 2), the points, where the scavenging air and mixture pumps are connected to the hollow central shaft, being' shown in a horizontal section on line M--N (Fig. 4).- v Fig. 2 -isa 'section on the line A-B-C-D-E (Fig. l), Fig. 3 is a section on the line F-GH-.J (Fig. 1), Fig. 4 is a section on the line O--P (Fig. 1).

1-are .four cylinders rigidly fastened to the engine bed and surrounding the rotatable central shaft 2. Two pistons 3 and 4 in each cylinder working in opposite directions are o eratively connected by rods 5 with so-callidd reeling rings 6 mounted on sphericalbodies 6a connected with the central shaft so as to impart to said bodies and to the shaft connected with them a movement of rotation.

In the position shown in Fig. 1 the explosive mixture inlet 7 surrounding the shaft 2 is connected by a port 8 in the hol'low shaft 2 with an annular chamber (suction chamber) 9 provided insaid shaft. Chamber 9 is connected with the channel 11 of the casing leading to the lower cylinder 1, by the port 10 which coincides with channel 11. The piston 3 of the lower cylinder-l having completed its return stroke from the right to the left has drawn nixture into the cylinder. At the same time the piston 3 inthe upper cylinder has pressed the mixture drawn in at a former phase through channel 11 and port 28 into the interior 0f shaft 2, the part at the right of the partition 12 of said shaft servingas an intermediate receptacle for the gas and air mixture. In the position shown in the'drawingpiston 4 of the lower cylinder having completed its stroke from the left to the right has drawn in air through the open left-hand end and through the cen'- tral tube 13 and port 14 of shaft 2. At the same time piston 4 of the upper cylinder in moving from right to left has pressed the air` drawn in at a former phase through channel 15 and port 29 into the chamber provided at the left of the partition 12in the shaft, this chamber extending across the annular chamber surrounding tube 13 into the spherical body carrying the left-hand reeling ring 6.

Patented Jaun. 18, 1916.

The chamber at the right of the .partition 12 of the shaft having .thus been filled with gas and air mixture and the left-hand chamber with compressed air, the admission of scavenging air and gas and air mixture into the motor will take place in the following manner: When at the end of the expansion of the gasesignited between'the pistons 3 and 4 of the upper cylinder the piston'4 uncovers inlet 16, a cam 30 on shaft 2 having caused the annular valve 17 governing the exhaust to Vopen the exhaust ports 18, the ports 19 arranged in the wall of the 1eft7 hand chamber coincide with corrponding vports inthe fixed casing surrounding the shaft. As shown in the drawings the valve 17 for each cylinder is in the form of a band encircling the cylinder between suitable ides, and passngabout a shaft 17a, 17", 1I? or 17d on the casing` or frame of the engine, said shafts being provided with rollers 17e which extend into' the path of the cam" 30. s the shaft 2 revolves the valve rollers will be moved outward, effecting a movement of the band 1 7 sufficient to open the ports 18, each of sald valves bemg returned toY its closed position as the cam palsses from engagement with the correspo ding roller. The compressed airstored within the hollow shaftnow passes through ports 19,' channel 20 and 16 into the upper cylinder and displaces the burnt gases causing them to escape through the ports 18.`

` -When the piston 4 of the upper cylinder has reached the final position represented in the drawing, the ports 21 provided in the wall of the right hand chamber in the shaft come in front of the casing channel 22 and the compressed mixture contained within the shaft entering the cylinder through channel 22 and inlet 16 displaces the scavenging air and fills the cylinder, whereupon the exhaust ports 18 are closed by the annular valve 17 governed by cam 30 on shaft 2, The admission of gas and air mixture is continued u 'itil piston 4 has closed the inlets 16, wherein` on a port 23 in the wall of the` `shaft2 which surrounds the suction chamber coincides with a port 24 connected with suction chamber 9 of the shaft. Therefore the reopening of the inlet 16 by the short piston 4 cannot cause any losses of mixture, the mixture having been forced out of the y. channel 22 and this channel as well as the channel 20 containing nothing but air.

In ,the Ajoints between the shaft and the walls of the compressed mixture chambers of the casing surrounding it an annular y groove 26 is provided, said groove being con- Vnected by a narrow opening 26a with the suction chamber M9 of the shaft. This arrangement serves for preventing a loss of mixture in case that the joints between the shaft and the casing shouldbecome loose. the compressed mixture being pressed first of all into the annular groove 26 and` being drawn from it through the opening into the suction chamber 9. A similar annular groove provided at 27 is similarly connected with the suction chamber.

I claim 1. In a two-stroke cycle motor, the combination'of a hollow shaft, a plurality of cylinders arranged around saidshaft', pistons lconnecting said suction chamber for the mixture with the mixture passage.

2l vIn a two-stroke cycle motor, the combination of a hollow shaft, a plurality of cylinders arranged around said shaft, pistons within the cylinders, means connected with the pistons'for rotating the shaft, separate intermediate storage chambers and suction chambers for scavenging air and for a mixture of air and gas within said shaft, passages for conducting scavenglng a1r, and

said mixture from the shaft to the cylinders, means for introducing the mixture into a cylinder, means for immediately thereafter connecting said mixture suction chamber with the mixture channel, and means `for .simultaneously connecting the mixture channel with the intermediate storage chamber for scavenging air.'

3. In a two-stroke cycle internal-combustion motor, -the combination of a hollow shaft, -a plurality of cylinders arranged around the shaft, pistons within the cylinders, means connected with the pistons for rotating the shaft, separate intermediate storage chambers and suction chambers for scavenging airand for a mixture` of gas and air arranged within the shaft, a casing surrounding'the shaft,passages in said `casing for conducting scavenging air, and a mixture of gas and air from the shaft to the cylinders, compressed mixture chambers in the fixed casing surrounding the shaft, annular grooves in the ]oints between the walls of the last said chambers and the shaft,

and a connection between said grooves and the suction chamber within the shaft.I

In testimony whereof I aiix myv signature in presence of. two witnesses.

WILHELM FROEHLICH. Witnesses:

WOLDEMAR HAUPT, HENRY HAsrER.

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