US528115A - Hermann schumm - Google Patents

Description

(No Model.)

H SGHUMM GAS 0R 011. MOTOR ENGINE.

No.` 528,115. Patented oct. 23, 1894.V

UNITED STATES s PATENT OFFICE.

HERMANN SCHUMM, OF OOLOGNE-DETZ, GERMANY, ASSIGNOR TO THE GAS-MOTOREN-FABRIK-DEUTZ, OF` SAME PLACE.

onsl oRoIl. MoToR- l-:NeINE SPECIFICATION forming part of Letters Patent N o. 528,115, dated October 23, 1894.

Applicationled February 21,1894. semina. 501,026. (naman.) Patented iii switzerland January 3, 1894, No. 7,730, in Belgium January 5.1894,No.107,980, and `in Italy January 30, 1894,11XIX. 396.

To a/ZZ whom t may concern:

Be it known that I, HERMANN ScHUMM, a citizen of Switzerland, residing at Cologne- Deutz, in the German Empire, have invented new and useful Improvements in Gas or Oil Motor-Engines, (for which I have obtained Letters Patent in Switzerland,dated January 3, 1894, No. 7,730; in Belgium, dated January 5, 1894, No. 107,980, and in Italy, dated Jannary 30, 1894, Vol. LXIX, 396,) of which the following is a specification.

In the specification to British Patent No. i

5,273,0f 1890, wasdescribed a construction of gas or oil motor engines wherein a diaphragm h or piston in a chamber communicating with the gas or air supply passages of the engine or with the engine cylinder itself, was caused, on the suction stroke of the engine piston, to actuate both the discharge valve of the engine and the gas admission valve, so as to properly control the action of these parts without the intervention of a shaft running at half the speed of the engine. My present invention relates to a modified construction of this device, more particularly applicable to oil lnotor engines, whereby it is rendered applicable for regulating the speed of the engine in a simple manner, which modified construction consists in the employment of one such flexible diaphragm and chamber for controlling the action of the oil supply pump of the engine, and a second such diaphragm and chamber for controlling the action of the discharge valve. By this arrangement a very simple mode of regulating the speed of the engine is obtained whereby, while the discharge valve is prevented from being opened when the engine runs too fast, causing the combustion gases to be retained in the cylinder and alternately compressed and expanded, the oil pump is at the same time thrown out of action so that no combustible charge is introduced into the cylinder. `With the use of a simple diaphragm for actuating both devices, as described in the said Patent No. 5,273, this mode of regulation would not be appreciable because when the diaphragm is deflected for preventing the discharge valve from opening, the oil pump connected to such diaphragm would be actuated by the latter,

gine in Which the oil is supplied by a pump my said invention with ref-` p into a vaporizing and mixing chamber o where it mixes'with the air supply entering through pipe L, the resulting combustible mixture being admitted to the engine cylinder on the suction stroke of the piston, through the automatically opening admission valve q. The plunger of the oil pump has for this purpose hinged to it astem c which is in line with the notched end of a rod b receiving vertical reciprocating motion from a cam or eccentric a on the engine shaft, while to the stem c is pivoted a rod connected to a flexible diaphragm h xed to a chamber g that communicates by apipe 'i' with the air supply pipe L, the diaphragm being pressed outward by a spring so so as to tend to keep the stem c out of line with the rod b. The discharge valve j' of the engine has pivoted to its rod a stem c in line with the notched end of a rod b receiving vertical reciprocating motion from an eccentric or cam aon theengine shaft. To the stem c is pivoted a rod connected to a flexible diaphragm h fixed on a chamber g, which communicates by a pipe 'L' with the chamber o above the admission valve q. To the rod" 1J is pivoted a weighted lever m acted upon by a spring y holding it against a stop b2, and having a beak fn that faces the stem c.

The action of the engine thus constructed is as follows: On the downward orsuction stroke of the engine piston, the resulting decrease of pressure produced in O and L causes a corresponding decrease of pressure in the chamber g causing diaphragm h to be pressed inward by the atmosphere against spring and consequently to draw the stem c in line with rod b so that on the then ensuing 11pstroke of the latter, the eccentric a forces up the plunger of the pump p, whereby a charge of oil is injected into the vaporizing chamber, mixing with the air and passing into the cylinder through valve q. At the same time IOO phragm h and stem c to be retracted during the whole of the suction or charging stroke, and for an appreciable time after the commencement of the compression stroke, as it will take some time for the full atmospheric pressure to re-enter the chamber O, small pipe ft and chamber g, so that when at the commencement of the compression stroke the eccentric rod advances toward c, this will still be suiciently retracted to escape the notched end of h2, and the discharge valve f will remain closed, and allow the charge to be compressed. This charge. is then compressed by the upstroke of the piston, is then iired and the Working down stroke is performed while at the same time as full atmospheric pressure has again entered chamber g', spring 0c in pressing h outward, moves c out of line with b. At the completion of the downstroke the eccentric ot in forcing the rod b against the stem c of valvef, opens the latter so as to allow the combustion gases to escape. This action continues so long as the speed is normal. When the engine runs too fast, the inertia of the weighted lever m causes it to lag behind during the upstroke of rod b, whereby beak n is made to press stem c to the right-hand, against the action of spring so as to bring the stem out of line with the rod b, and consequently the valvefis not opened during the return stroke of the piston, which is thus made to compress the combustion gases. On the following outstroke of the piston these gases expand again, and there being no suction action there is no reduction of pressure in O, L, and g and consequently the spring no maintains the stern c in the position out of line with the rod b', so that the oil pump p is not actuated. This action continues until the speed of the engine is reduced to the normal again, when the described action of lever m ceasing, the discharge valve will again be opened by the eccentric a, and a fresh combustible charge Will be introduced at the suction stroke. The plunger 0f the pump p after having been forced upward by the eccentric a is moved down again to its original position against a stop by a spring m2.

It is obvious that in place of the flexible diaphragms h h and chambers g g small cylinders and pistons may be used, also that in place of a pump p any equivalent device for introducing combustible fluid under pressure into the mixing chamber may be em ployed.

. Having thus described the nature of my invention andthe best means I know for carrying the same into practical effect, Iclaim- 1.- In a four stroke cycle gas or oil motor engine the combination of an oil pump or equivalent device for introducing combustible fluid under pressure into the mixing chamber, an eccentric cam or crank on the engine shaft for actuating` such device, through the medium of a stem pivoted to such device, a chamber communicating with the mixing chamber or air supply pipe, and containing a flexible diaphragm or equivalent device connected to said stem and acted upon by a spring causing it to move said stem out ofv line with the eccentric, substantially as and for the purposes described.

2. In a four stroke cycle gas or oil motor engine,the combinationofanoil pump or equivalent device for introducing combustible fluid under pressure into the mixing chamber, and controlled by the flexible diaphragm acharnber communicating with the mixing chamber or air supply pipe of the engine, so as to sup ply combustible uid to the mixing chamber during the suction stroke, a discharge valve for the combustion gases actuated by aneccentric crank or cam on the engine shaft through the medium of a pivoted stem on the valve spindle, a iiexible diaphragm connected to said pivoted stem and fixed on a chamber communicating with the mixing chamber or air supply pipe of the engine, a spring tending to keep the pivoted stem in line with the rod of the eccentric, and a governor device acting upon the said pivoted stem so as to maintain this out of line with the eccentric ro`d when the engine is running too fast, substantially as described.

In testimony whereof I have signed my name to this specification, inthe presence of two subscribing witnesses, this 3d day of February, A. D. 1894.

HERMANN SOHUMINI.

Witnesses:

FRITZ SCHRDER, SOPHIE NAGEL.

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