US757415A - Gas-motor engine. - Google Patents

Description

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INV ENTOR Mat r No. 757,415. PATENTED APR. 12, 1904. A. ROLLASON.

GAS MOTOR ENGINE. APPLICATION FILED my 22, 1001.

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No.- 757,415! PATENTED APR. 12, 1904."

A. ROLLASON. GAS MOTOR ENGINE.

APPLICATION FILED MAY 22, 1901. N0 MODEL. 5 SHEETS-SHEET 3.

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No. 757,415. PATENTED APR. 12, 1904. A. ROLLASON.

GAS MOTOR ENGINE. prLIoATIoN nun Mn 22, 1901.

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PATENTED APR. 12, 1904.

ROLLASON. GAS MOTOR ENGINE.

APPLIUATION FILED MAY 22, 1901.

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Patented April 12, 1904.

PATENT OFFICE.

ARTHUR ROLLASON, OF LONG EATON, ENGLAND.

GAS-MOTOR ENGINE.

SPECIFICATION forming part of Letters Patent No. 757 ,415, dated April 12, 1904.

Application filed May 22, 1901. Serial No. 61,387. (No model.) i

To all whom it may concern.-

Be it known that I, ARTHUR RoLLAsoN, a citizen of England, residing at 13 Lime Grove, Long Eaton, in the county of Derby, England,

have invented certain new and useful Improvements in Gas-Motor Engines, (for which I have applied for a patent in Great Britain, dated March 21, 1901, No. 5,974,) of which the following is a specification.

This invention has for its object improvements in gas-engines which give an impulse at every revolution of the crank-shaft and which have two pistons moving in opposite directions in one cylinder provided with latr 5 eral ports for the admission of the charge and for exhaust of the products of combustion at opposite ends, these ports being uncovered by the pistons as they are completing their outstroke and being covered by the pistons as they advance,compressing the charge between t 1cm.

In order that engines may work satisfactorily when furnace or fuel gases are employed to work them, a volume of cool air should be forced through the working cylinder after each explosion to cool the cylinder and the pistons and to sweep out the products of combustion along with any dirt or dust that may be deposited, thus preparing the 0 cylinder for the new explosive charge.

My invention relates to means of eifecting the scavenging and coolingand the admission and compression of the explosive mixture into the cylinder at the proper times, as I shall describe, referring to the accompanying drawings.

Figure 1 is a longitudinal section of an engine according to my invention. Fig. 2 in its upper half is a plan and.in its lower half a 4 sectional plan. Figs.3,4, and5 are transverse sections, respectively, on the lines 3 3, 4 4, and 5 5 of Figs. 1 and 2, the section on the lower part of the left side of Fig. 5 being taken on line 6 6 in order to show the valves; and

Figs. 6 and 7 are respectively aplan view and a sectional side elevation.

The engine-shaft has a central crank a, connected to a piston 6, and two cranks 0 c, which are opposite to a and are both connected to 5 the piston-rods of another piston 0Z. Both the pistons Z) and (Z are diiferential, their smaller parts working both in one cylinder 0 and their larger parts f and g working in enlargements at each end of the cylinder 6. When the pistons b and d, which move in opposite directions, are at the extremes of their outstrokes,

as shown in Figs. 1 and 2, they uncover lateral outlet-ports h, communicatingwith an exhaust-outlet Z9, and lateral inlet-ports a, communicating with the annular space Z, sur- 6o rounding the cylinder 6 where these ports occur. At the front end of the cylinder there are passages m, which may communicate by pipes a under the floor with a supply of gas or explosive mixture to a valve n, which is worked by levers and rod from a cam 0 on the crank-shaft, and above this is a self-acting valve 9, which may consist of strips of leatheror like material laid over the passages of a grating. From the valve 12 a passage 00 leads to a reservoir from which there. are openings covered by spring-valves g, the space under their seatings communicating with the annular space Z, above referred to. In the rear enlarged part of the cylinder there are two pairs of self-acting grating-valves s, the lower valves covering inlets t for air and the upper valves giving passage to the space Z. The valves q are opened in opposition to the springs by a lever and rod Worked by a cam 8 a on the crank-shaft.

The engine operates as follows: Assuming that both pistons b and d are at the extremes of their outstrokes, as shown in Figs. 1 and 2, that by previous strokes, as will presently be described, gas or explosive mixture has been compressed in the reservoir 9" and air has been compressed in the space Z, then the air under pressure from Z entering the cylinder 6 by the ports 7; sweeps the products of previous explosion through the ports it, and then the valves 9 being opened by the action of the cam 14 the gas or explosive under pressure passes from the reservoir r into the cylinder, mixing with the air therein, forming the 9 5 explosive charge. As the pistons b and d return inward they close the ports h and c' and compress the charge between them. This being ignited electrically or otherwise, the pistons are both propelled outward and the cycle I00 is repeated. As the pistons b and d move outward their enlarged parts 9 and f operate as pump-pistons, 9 drawing in gas or explosive mixture through the valve 42, and f drawing in air by the lower valves 8. When the pistons b and d move inward, g forces the gas or explosive mixture which it had drawn in through the valve p and passage 00 into the reservoir 7", where it remains in a compressed condition, and f forces the air which it had drawn in through the upper valves 8 into the space Z. The compressed air thus stored in Z serves, as above described, to clear the products of combustion out of the cylinder 6 and the valve g being opened furnish, with the gas or explosive mixture from r, a fresh charge, which is compressed and fired every revolution of the crank-shaft. Having thus described the nature of this invention and the best means I know of carrying the same into practicalv effect, I claim 1. An explosive-engine cylinder having two larger cylinders in tandem therewith at its ends, one of said cylinders having port connections arranged to draw in and compress the charge, and the other cylinder having port connections arranged to draw in and compress air, and two plungers in the motive cylinder arranged to reciprocate simultaneously in opposite directions, each plunger having an enlarged piston portion fitting in one of the end cylinders; substantially as described. 7

2. A gas-motor engine having a motive cylinder with an air-compressing cylinder and an explosive-compressing cylinder in alinement therewith at its opposite ends,tw0 pistons in the motive cylinder connected by connecting-rods to opposite cranks on the same shaft, each having an enlarged portion serving as a piston for one of the compressing-cylinders, in combination with the self-acting valves 8 and the air-space Z; substantially as described.

3. A gas-motor engine having a motive-cylinder with an air-compressing cylinder and an explosive-compressing cylinder in alinement therewith at its opposite ends, two pistons in the motive cylinder connected by connectingrods to opposite cranks on the same shaft, each having an enlarged portion serving as a piston for one of the compressing-cylinders, in combination with the passages m, the valve n with its operating-lever, the valve p, the springvalves (1 with their operating-levers, and the reservoir r; substantially as described.

4. An explosive-engine cylinder having two larger cylinders in tandem therewith at its ends, one of said cylinders having port connections arranged to draw in and compress the charge, and the other cylinder having port connections arranged to draw in and compress air, two plungers in the motive cylinder arranged to reciprocate simultaneously in opposite directions, each plunger having an enlarged piston portion fitting in one of the end cylinders, storage-chambers connected to the end cylinders and valve mechanism arranged to feed the compressed air and charge successively into the working cylinder; substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

ARTHUR ROLLASON. Witnesses:

DOUGLAS C. SToRER, THos. H. 000K.

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