US684197A - Valve-gear for explosive-engines. - Google Patents

Description

N0. 684,l97. Patented Oct. 3, I901.

' E. D. DEBUUTTEVILLE.

VALVE GEAR FOB EXPLOSIVE ENGINES.

(Application fllad July 12, 1899.)

(No Model.)

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UNITED STATES PATENT OFFICE.

EDOUARD DELAMARE DEBOUTTEVILLE, OF FONTAINE LE BOURG, FRANCE.

VALVE-G EAR FOR EXPLOSIVE-ENGINES.

SPECIFICATION forming part of Letters Patent N 0. 684,197, dated October 8, 1901.

Application filed July 12,1899. Serial No- 723 .585. (N model.)

To all whmn it may concern.-

Be it known that I, ED OUARD DELAMARE DEBOUTTEVILLE, a citizen of the French Republic, residing at Fontaine le Bourg, department of the Seine-Infrieure, France, have invented Improvements in Gas-Motors, Of Whl(3h the following is a specification.

This invention relates to improvements in supply-controlling devices for gas-engines, and especially to a special arrangement of air and gas valves adapted to obtain homogeneousness of the mixture admitted in the cylinder of the engine. My invention further relates to the means adapted to act upon the said valves, as will be hereinafter fully described, and pointed out in the claims.

Hitherto it has been usual in gas-engines to make use of a mixing-chamber separated from the cylinder by means of a suitable check-valve and in which the air is admitted freely while the gas-supply is controlled by means of a suitable gas-inlet valve. Such devices, however, are not adapted to secure perfect homogeneousness of the mixture admitted to the cylinder, as the supply of air necessary for the gas combustion is not subjected to any regulation and depends only upon the constant size of the port which establishes the communication with the atmosphere and upon the variable speed of the piston which always draws substantially the same quantity of air in the mixing-chamber, and consequently in the cylinder, while, on the contrary, the gas-inlet alone being controlled is more or less choked, according to the lifting of the valve. In other similar devices the supplies of air and gas are both controlled by a single valve actingto choke more or less the port for air and gas. It is, however, also qnite impossible to obtain a homogeneous mixture with such a device, as the two series of passages or ports are superimposed and have different sections in such a manner that one of the passages will always act before the other and that the choking resulting from the lifting of the valve will vary accordingly for each valve. In order to avoid such defects and to provide in any time for the perfect homogeneousness of themixture, the present invention broadly consists in the use of an air-valve and a gas-valve of same dimensions located symmetrically and opening into the mixing-chamber, the said chamber being fitted with a check-valve which opens simultaneously with the air and gas valve under the action of a movable sleeve acting upon the rods of the three valves by means of adjustable tappets carried by the movable sleeve in such a manner that the lifting of the three valves being always effected at the same moment the air. and gas are always sucked in given proportions and are thoroughly mixed during the whole stroke of the piston, so as to secure the perfect homogeneousness of the mixture, the choking of the air and gas valves being the same for the two fluids and varying simultaneously and in the same proportions during the whole stroke of the piston according to the lifting of the valves.

The accompanying drawing illustrates in sectional elevation the construction accord ing to my invention.

As illustrated by the drawing, the admission-ports (shown in dotted lines) A and B are closed in a suitable valve-casing by valves 0 and D, having the same section or inletopening and placed symmetrically in the mixing-chamber E. These valves 0 D are held on their seats by the spiral springs to a.

The mixing of the gases takes place in the mixing-chamber E, andthe admission of the mixture to the motor-cylinder is regulated by the large valve F, which is similar in construction to the valves 0 D. The opening of these three valves depends upon the displacement of a sleeve G, which slides on acylin- 'drical guide G, which is an extension of the valve-casing, said sleeve acting simultaneously upon the valvesO and F by means of tappets while a detent 7t controlsthe gasvalve D.

The arrangement of the detent It may be of any kind. As an example, in the drawing the detent h is pivotally secured on an axle m, carried by a lateral extension m of the sleeve G. The said detent has an arm h, carrying at one end a counterweight 19 (shown in dotted lines) and at the other end a connection with the rod 8 of an air-governor S. A downwardly-projecting extension h2 of the detent h is connected by means of a spring auxiliary shaft 0 of the motor.

n to a lever 12, adapted to engage with the extremity of the arm h, as usual in automatic expansion-gear of steam-engines.

The sliding of the sleeve G on the cylindrical guide G is effected by means of a lever I, carrying at its upper end a roller 71, acted upon by a suitable cam 0, mounted on-an The said lever I is pivotally secured at its lower end to a lever I, pivoted at I to the valve-casing and which acts upon the sleeve G by aid of a link 1 pivotally secured to the side of the said sleeve G. At the moment when the roller 2' is acted upon by the cam O the lever I is lifted and, through the connections I and 1 causes the sleeve G to slide upwardly on the cylindrical guide G. The exact position of the tappets g 9 being regulated by screws and nuts in such a manner as to give the valves a suitable stroke or lift, and the detent h be.

. ble to have a greater choking of the gas-inlet or of the air at a given moment of the stroke, as is the case with the devices hitherto used. Consequently the composition of the mixture of air and gas which is formed in the chamberE is absolutelyhomogeneous. This gaseous mixture penetrates into the com- 'bustion-chamber in proportions which remain unalterable during the whole length of the throw of the piston, and if it is assumed that the capacity of the space of the cylinder is to be divided into sections by parallel zones on the face of the piston the composition of the gaseous mixture would be identical in every one of these zones. This would not be the case with the old devices, hereinbefore referred to, for the reason that, as already stated, in one case the gas-inlet is choked in a variable manner, while the airinlet is constantly choked in the same manner, and that in the other case the air and gas inlets are choked relatively to each other in a variable manner, not being the same for the two ports, one of the passages being open before the other.

What precedes has reference to the normal running of the engine. The speed of the engine is regulated by a hit-or-miss governor shutting off the gas during the whole length of one or more working strokes of the motor. This regulator (for which no claim is made) consists of the following parts: An air-cylinder S, bored to two different diameters, and a piston T, fitting tightly in the lower part of the cylinder and allowing the air to pass around it in the upper half. Any increase of speed of the engine causes the increase of pressure in the air-cylinder, with the result that the piston tends to rise more slowly than the pivot m, mounted on the brackets m of sleeve G, and thus to tilt the lever 71,. The detent h is thus thrown out of gear and does not lift the gas-valve D. In its tilted position the end of the lever 71. is brought undera projection on the vertical lever n and catches onto it. It is held in this position by the tension of the spring a, the lateral deviation of the detent h and tilting of the lever h being limited by the stop m The whole system it h n it now rises, maintaining its inclined or out-of-gear position until the slanting upthe piston T being smaller in diameter than the upper part of the cylinder S, itofiers no further resistance once the mid-stroke position is reached when lifting the valves.

As already stated, I am aware that gas and air valves have already been used, in combination with a mixing-chamber, independent of the motor and with a check-valve admitting the mixture to the cylinder; but

What I claim, and desire to secure by Let 2. In'combination with the cylinder of a 7 I16 gas-engine and with a mixing-chamber independent of said cylinder, a valve-casing, an

air-valve and a gas-valve of the same'dimen-z' sions located symmetrically in the valve-cas= ing and opening into said chamber, a valve establishing comm unication between the mixing-chamber and the cylinder of the motor, a guide formed by an extension of. the. valvecasin g, a movable sleeve sliding on said guide, tappets carried on said sleeve and acting simultaneously upon the air-valve and the admission-valve for the mixture and means for opening simultaneously the gas-valve and means for closing it, substantially scribed.

3. In combination with the cylinder of a gas-motor and with a mixing-chamber inde. pendent of said cylinder, a valve-casing, an air-valve and a gas-valve located symmetric ally in the valve-casing and opening into the mixing-chamber, a valve establishing communication between the mixing-chamber and the cylinder, a guide formed by an extension of the valve casing, a movable sleeve sliding on said guide, two tappets carried by as desaid sleeve and'acting simultaneously upon the air-valve and the admission-valve for the thereby for acting on said air and discharge mixture, and means for operating the gasvalves, and a' hit-or-miss detent pivoted to valve, substantially as described. said sleeve and adapted to act on said gas- I 5 5 t. In combination with a gas-motor cylinvalve, substantially as described.

der, a mixing-chamber independent thereof In witness whereof I have hereunto set my having a centrally-arranged discharge-openhand in presence of two witnesses.

sleeve carried by said guide, tappets carried ing, air and gas ports on opposite sides of EDOUARD DELAMARE DEBOUTTEVILLE.

said chamber, independent spring-pressed ,Witnesses:

10 air and gas valves closing the same, a guide I R. VAUSSARD,

carried by said chamber-casing, a movable P. PELFRINE.

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