US911992A

US911992A - Valve mechanism for gas-engines.

Info

Publication number: US911992A
Application number: US38681907A
Authority: US
Inventors: Szymon Jachimovicz
Original assignee: Individual
Current assignee: Individual
Priority date: 1907-08-02
Filing date: 1907-08-02
Publication date: 1909-02-09
Anticipated expiration: 1926-02-09

Description

S. JACHIMOYIGZ. VALVE MEGHANISM Fon GAS ENGINES.

APPLICATION FILED AUG. 2. 1907.

Patented Feb. 9, 1909.

` 2 sums-snm 2.

INVENTUH wmvfssfs: 71.

Mfg

Arm/wer SZYMON JACHDIOVICZ, OF BERKELEY, CALIFORNIA.

VALVE MECHANISM FOR GAS-EN GINES.

' Specification of Letters Patent.

Patented Feb. 9, 1909.

Application led August 2, 1907.v Serial No. 386,819.

To all whom it'may concern.'

Be it known that I, Szrirox JAcHniovrCz, a subject of the Emperor of Russia, residing at Berkeley, in vthe county of Alameda and. State of California, have invented new and useful Improvements in Valve Mechanism for Gas-Engines, of .which they following is a specification.

This invention relates to improvements in the means for admitting air and gas for gas engines, and for exhausting therefrom.'

The objects of the invention are, first, to actuate both the inlet and theexhaust valves by a single eccentric; second, to provide a sim le means for. regulating the mixture, bot quantitatively, as to. the amount admitted, and qualitatively, Aas to the proportion of air and gas and in both cases'without thi'ottling the gas supply; third, to provide simple means for maintaining the valve closed When starting the engine by compressed air; fourth, to provide an arrangement whereby, when using a comparatively small proportion of gas, the gas is admitted in a part only ofthe stroke, so that. a portion of the charge is a comparatively rich mixture of gas and air, whereby a greater certainty of explosion is obtained iifth, to provide means whereby the amount of air admitted may be pro lortioned to the quality of thegas used, so t iat when goed gas is used more an' 'can be admitted and less air when poor gas is used g sixth, to provide an arrangement by which adjustment of the ports for the air and gas, to reduce the amount of the iiuid admitted may take place in a verticaland not in a Ahorizontal direction, and whereby also the air shall be admitted above the gas and in a downward direction thereby insuring as milch as possible the complete mixture of the gas and air; seventh, to provide means whereby the control of the ymechanism for admitting the air and gas shall entailA as little Work as possible upon thegovernor.

In the accompanying drawings, Figure 1 is a transverse section, of the admission end of a gas engine to which my improvement is applied; Fig. 2 is a detail sectional View ofthe valve chamber; Fig. 3 is a horizontal section of the same on the line 3-3 of Fig. 1; Fig. 4 is a diagrammatic view of one of the air ports and of a portion of the slide valveadjaceut thereto Fig. 5 is a similar view of the gas inlet; 6 is a view, similar to Fi 1, of a modification of my invention as app 'ed to an old forni of single acting gas en gine g Fig. 7 is a broken longitudinal section oi' the same.

Referring to the dmv-ing, 1 indicates the casing of the engine, having the inlet valve 2 and the exhaust valve 3, the latter operated by means oi' an eccentric 1, through a lug 11)- on the ring 20 of the eccentric, a bell crank lever 5 and a. link 6.'

The linlet valve 2 is carried by a 'stem T connected to a union 8, which in itsturn is connected to a stein 9 which is normally raised by means of a spring 1U. Upon this union are pins 11, which are adapted to be engaged byl a forked lever. 12, pivoted at 13 on an extension 14 from 'the head ol' the valve box 15. The outer' end ot' said lever isadapted to be engaged bya hooked lever 16 pivoted at 1T on the upper end ot' a pitnian 1S, connected to a lug 19 of the ring 2() oil the eccentric 4. Said pitman is also connected by a link'21 with the same pivot as the lever 12.

The hooked lever 16 is provided with a tail 22, which-is engaged by two springs 23, 24, so as to normally maintain it in its operative position on the pitinan. Yith the lever 12 is connected the rod 25 .of a piston working in a dash pot 26 attached to a bracket 27 extending from the valve box 15. Adjustably attached to the extension 14 is a curved de-v flcctor 2S which is adapted to engage a nose 29 on the hooked lever 16. In the drawing, the pitnian is shown 11i its lowest position and as it rises by reason oi the rotation of the eccentric 4, the hooked end of the leve'r 16 engages the end oi' the lever 12 and thereby depresses the valve 2 admitting to the engine the mixture of gas and air. As the pitman continues to rise the nose 2) strikes against the deilector 2S, causing the hook to be withdrawn from the end olI the lever 12, whereupon the valve immediately rises under the action of the'spring 10. .is the. pitman de- 'sc-ends, owing to the continued rotation of the eccentric, the hook again returns to its norma-l position ready to engage t he end ol' the lever 12.

The curved deilector 2S is automatically adjusted by a lever 31 which is connected by a link 32 to the governor 30, of the gas engine, so that the cut-oil is automatically controlled by the governor according to the speed of the gas engine. Y

/33 indicates the air inlet conduit and 31 the gas inlet conduit. T hc conduit 33 lea-ds to a \cliamber 35 connected by passages 36 Oxv with the interior of the valve box 15. In like manner, the conduit 34 leads to a cham- Between the

chambers

35 and 37 is anv annular chamber 38 having upper and lower ports 39 and 40 extending respectivelyl obliquely upwards and downwards from the chamber to the interior ofthe valve box.

The two ports 39, 40, are made oblique so as to direct the current of air at such an an le as to effect the most perfect mixture with t e Yithin the valve box slides the valve 41 which is attached to a sleeve 42 around thevalve stem. Said sleeve and the valve connected therewith reciprocate always 1n umson with the inlet valve, but can be turned around said stem by means of a slot 43 formed in said sleeve, into which extends a in 44 from a collar 45, connected with aever 46 connected' through the deflector shaft with the 4governor 30 of the engine, so that the valve is turned automatically in accoi-dance with the speed of the engine. The passage of the air is controlled by a ring 47,

. which can be moved by rods 48 over either of formed with radial webs 53 on which areI formed the lower slide valve which slides' over the gas inlet ports ,55 said slide 54I being undercut onQits upper surface so as to form a small chamber in which any deposits of tar, or like matter can be received, to prevent the valve sticking. The upper slide52 is in the form of a narrow cylinder, so as to conform to the arrangement of the upper air ports,

but thel lower vslide.' 54 has its upper edge formed in'a series of inclines conforming to the spiral form of the' gas inlets 55. This arrangement-is shown diagrammatically in Fig.

5 in whichthefull lines show the osition for a maximum admission andthe otted lines It will readily bey for minimum admission. seen that, in the former position, they gas inlet ports are'opened as soon as the valve begins to move downwards and therefore a maximum admission of gas is obtained, but when the valve has been moved to t-heposition shown in dotted lines, the valvedescends a considerable distance, before the gas inlet ports begin toy be uncovered and said .inlet ports remain uncovered for a comparatively short time, so that in the latter position the proportion of gas to air is reduced. n

When the gas engine is to be started by the use of compressed air, it'i'is necessary to maintain the inlet valve closed otherwise the compressed air would escape, and to accomwhole of the stroke of the valve,

vplish this result, there is provided a lever 57 f adapted to be operated by means of a link 58, the end of said lever when so operated being moved to such a position that it interferes with thehook 16 when in its lower position and prevents the latter engaging the end of the lever 12 to open the inlet valve.

It will be observed that the inlet and ex'- haust vvalves are both operated from a single eccentrica This I am enabled to accomplish by means of the two lu s 19, 19', the 1in s 6 and 18. y

In Figs. 6 and 7 is shown a modification of my'invention applied to an old'style of engine. In this modification also, 2 indicates the inlet valve and,3 the exhaust valve, and, as before, there'is a sleeve 42 movable with the valve stem and, rotatable on said stem, p said sleeve carrying a slide piece. In the 35 resent instance, there is shown a handle 60 or so turning saidftube. It mj' be,'l`how ever, also turned from the governor in the same way as infthe former modification. The general arrangement of the `valve ports and the slide is similar to that in the first modification, except that the'intermediate chamber 38 is now dispensed with, and the air is admitted direct from the air chamber 35.

special arrangement ofthe t e bell `'crank lever 5, and l' Instead of the valve being operated lby an eccentric,`as in the first modification, it is now o erated by means of a cam 61 and this cam s ould be of such form that the valve shall not remain at rest for any appreciable portion of the stroke when it is opened toits full extent. By providing a cam of this form it is possible to reduce as much as may be' desired, the amount of gas admitted. `-lf t-hecam were of such a form that, for a considerable part of the stroke, Athe valve remained stationary when opened, then during this part of the stroke, when t-he valve so remained stationary, it would not be possible to make any variation in the. amount of gas admitted. It" will also be observed that by this construction of air and gas inlets, so regulated, 'while the air is admitted ring the e as, when admitted for a part only of the strgke, is admitted wholly in the middle portion of said stroke; that is to say, in the latter case,` the air is admitted both before and afte` the gas is admitted. The ro` ortion of the part of the stroke during wllic 1 the gas is so admitted in the middle of the stroke will var 120 with the proportions of the mixture desire and is obtained by turning the slide valvey from the governor. But in all cases, exce t when the gas is -admitted during the who e stroke, the admission of the gas is confined to the middle part of the stroke. The advantage of this arrangement is, that thereby the ignition is much more certain andefl'ectiv'e when a very small'amount of gas is admitted.

los

'In rior devices,=when a comparatively small 1:3

air, which mixture is" between tivo layers' of comparatively pure air. In order, however, vto obtain the benefit of this arrangement it is necessary that the ignition device 65 shouldl be arranged in proximity vrith this comparatively rich middle layer of the mixture, that is, it should be placed as near as possible to the middle of compression chamberwhere this layer of comparatively rich mixture will be found before ignition.

I claim 1. In a gas engine, the combination with the body of the engine, of a shaft, an eccentric upon said shaft, a ring on said eccentric having two lugs, a lever connected to one of said lugs and to the engine frame, 'means for opening the exhaust valve by the movement of said lever, a rod connected to the other lug ofthe eccentric, a hooked member carried by said rod and adapted to engage the lever which opens the inlet valve, means controlled by the governor for breaking said engagement, a spring for closing said valve, a slide valve movable with said inlet valve but rotatable around its stem, a valve box having` air ports arranged in planes at right angles to the axis of said box and gas ports spirally arranged, said slide valve having edges adapted to cover said air and gas ports, and means controlled by' the governor to rotate said slide valve, whereby the gas may be admitted only after the air has been admitted.

2. In a gas engine, a mixing chamber hav' ing circumferential air ports and inclined gas ports, a slide valve in said mixing chamber reeiproc ating with the inlet valve and having a correspondingly shaped edge adapted to coversaid ports, means controlled bythe governor for rotating said slide-valve relatively to said ports, whereby the opening of the gas ports by said slide valve may be retarded and their closing advanced relatively to the opening and closing of the air ports which remain constant.

3. In a gas engine, the combination of a valve box having air and gas ports, the latter being arranged obliquely, an inlet valve, a slide piece movable with said inlet valve, but rotatable with reference to said ports, and means for so rotating said slide piece,'that the gas may be admitted only after the airV has been admitted, substantially as described. Li. In a gas engine, the combination, vth

the body of thev engine having a mixing chamber and a compression chamber, an inlet valve between the mixing chamber and the compression chamber, air and gas ports in the Wall of the mixing chamber', means reciprocating with the inlet valve for opening and closing said ports, means for rotating one of the said elements, the said Wall and the closing and opening means, relative to the other, said ports and said closing means being conformed to vary the time of opening of said ports by said reciprocation, substantiallyas described.

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

' SZYMON JACHIMOVICZ.

Witnesses:

FRANCIS M. WRIGHT, D. B. RICHARDS.,