US1252692A - Valve-gear. - Google Patents

Description

A". HARRIS,

vALvE GEAR. APPL'ICATION FILED MAR 30. i917. Patented Jan. 8,1918,

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VALVE GEAR.

APPLICATION FILED MMI. 30, IQII.

Patented Jan. 8,1918.

Hl/R'S, OF DENVER. CGLORADO, SSIGNOR OF ONE-HALF TO SANFORD.

CALDWELL, OF DENVER, COLORADO.

VALVE-GEAR.

flo @ZZ whom i 'may Concern:

it lo: mn that l, Anirn'r HARRIS, a citizen of the 1United States, residing at Denver, in the county of Denver and State of Colorado', have invented Certain new and useful improvements in Valve-Gears; and l do herehy declare the following to be a full, clear, and exact description of the invention, such will enable othersskilled in the art to which it appertains to make and use the san-1e.

his invention relates to valve geur more particularly intended 'for usel on internal combustion engi-nes; and it Consists in the novel construction 'and combination of the parts hereinafter fully described and claimed.

ln the drawings, Figure l is an end view of portions of an internal combustion engine, partially in section, and provided With a valve gear according to this invention. Fig. 2' is a longitudinal section through the valve gear, drawn to a larger scale. Fig. 8 is a side View ofthe vali/e spindles or rods showing the crankshaft in cross-section. is o. plan vier.7 of the lever mechanism. The engine has s. power cylinder i2, and a ton f5 which Works therein and drives a which works in a hollow frame der 2 has an exhaust port tl near i i h is uncovered by the pis e the. exhaust. Jin exhaust fen or of any approved construction is coninst is uncovered. fin air-"admis der, and this valve is opened so as to let exhaust tan or pump draw a ourrent pure air through the Cylinder to eX- pel the products of combustion. This exhaust fan or pump is not herein more fully` described as any approved device for exhausting the contents of the cylinder can be used.

.mission valve 8 for or inflamor lsprovided at the rear end of Specification of Letters Patent.

, l is provided at the rear end of lopens the air valve. de; and it closes a 9 on a gas Patented Jara.. 8, 33.918.

Application filed March 30, 191?. Serial No. 158,573.

chamber l0 on the cylinder. The gas is supplied under a low pressure to the gas Chaniber 10 iu any approved way. The stem 12 of the gas valve slides in a guide ll on` the top of the gas Chamber l0, and the stein 12`is hollow so 'that it forms an air passage l5.

'lhe air valve 7 closes a seat l@ at the hottom of the. passage 15, and its stein l? is slidable in a guide 18 secured in the projecting upper end portion of the tubular valve stein l2. This guide or stem, or both of them, have air inlet holes 19.

The air valve 7 is operated by means of a lever 20, the middle part of which is 'pivoted to a rocking fulcrum rod 2l by a pin 2:2. The lower part of the fulernin rod 2l is pivoted to the cylinder or other stationary support by a pin Q3. The lever 20 is formed in two parts which straddle the eye of the fulcruni rod, and one end portion of it is pivoted to the stein 17 of the air valve by a pin Q4. The other end portion of the lever 2O is pivoted by a pin Q5 to the rod 2G which operates the air valve. x

Ji casing 8 is secured to the crankshaft easing, and a cylindrical guide Q9 is secured in this casing. il tubular rod is provided for operating the gas valve P, and this rod 3) slides longitudinally in the easing 28.

y'll`he rod slides inside the rod 30, and its loiver part, has an enlargement El which is secured to it hy screwthreads This enlargement- 31 slides longitudinally in an enlargement 33 of the rod 30 to which it is secure; l by serewthreads 34.

Tue enlargement 33 slides in the guide 29, and it has a piston 35 on its lower end which slides in and closes the lower end of the oasing 28. The lower end portion of the en largement 3l has astexn 3G secured in it, and this stem carries a housing 37 in' which a roller 38 is journaled. Tue Crankshaft 4 has a cam 40 secured on it, and, as the crankshaft revolves in the direction of the arrow in Fig. 3, this cam engages with the roller 38 and pushes up the air valve rod 26,'and It is timed to do this when the piston uncovers the exhaust port,

so as to admit pure air to taire the place of the products ot combustion which are sucked out of the cylinder by the exhaust fan.

The "tubularv enlargement 33 of the rod 30 has a housing 4l secured to its lower end, and two rollers i2 are journaled in this housing. The crankshaft 4 has two cams 43 secured on it, and these cams push up the rod 30, after 'the air valve has been open for a sutiicient length of time, and open the gas valve 8:

The upper end portion of the rod 30 is pivoted to one end portion of a lever 45 by a double-eye 46 and pins 47. T his lever 45 is made in two parts which are spaced wider. A apart than the two parts of the air lever 20,

c and its other` end portion is pivoted to the tubular stem l2 of the gas valve byy pins 48. The middle part of the gas lever 45 is pivotally connected to the pin 22 at the upper end of thefulcrum rod 2l by links 49 and pins 50.

The air rod 26 and the gas rod 30 are moved downwardly by any approved means. In the example shown, the casin 20 is divided into two chambers 51 and 52 by a partition 53 which also affords a support forthe guide 29. A spring 54 is shown in the lower chamber 51 between the partition 53 and `the piston 35, for pressing the gas rod downwardly, but compressed pair may be used instead of. the spring, or both compressed air and spring may be used. A branchl pipe' 55 is shown for the admission of compressed air to the chamber 51..

A spring 56 is also shown in the upper .chamber V52 for pressing the air rod down- Wardly. This spring 56 is arranged between a cap 57 at the top of the chamber and a piston 58 which is slidable in the chamber, and which is suitably secured to the enlargement 31 of the air rod 26. A branch pipe 59 is shown for admitting compressed an' to the chamber 52, when compressed air is used in addition to the. spring 56, or instead of it.

When compressed air 1s not used it'is not` necessary for the piston 58 to fit the chamber 52, as it merely has to form an abutment for the spring.

In carrying out this invention, a series of similar engines is provided, and the engines are arranged so as to work to the best advantage, and the crankshaft is provided Withcranks arranged at suitable angles to each other, vand .driven by the engines pertainin to them. The gas is admitted throng the gas valve under low pressure to mix with the air in the engine cylinder, after the piston has closed the exhaust port, and the gas valve is closed as soon as sutcient gas has been admitted,l sothat the mixed gas and air may ,be com ressed in the cylinder during the latter p'a of each back stroke. The mixture is ignited at the commencement of each orvvardstroke by any approved igniter or spark plug.

`to the fulcrum rod, two operatin Vhavin The connection of the ston 58 with the inner tubular rod 3l. is eected by means of a key 60 which tits snugly in key-ways or slots cut in the said parts, and which is slidable longitudinally in elongated slots 6i in the outer tubular rod 33. rIhe piston 58 is arranged to slide freely upon the said outer tubular rod 33.` What I claim 1 l. In a valve rear, s, gas valve and an air valve provided with longitudine-.ily slidable concentric stems, two operating ievers pivoted at one end to the said valve stems, pivoted supporting devices pivoted to the middle parts of the said levers and permitting them to move crosswise ot the valve Stems and independently of each other, and means for operating the said valves independently of each other connected to the other ends of the said levers.

2. In a valve gear, a gas valve and an air valve, a pivoted fnlcrum rod, links pivoted ievere their middle )ortions' pivots ly sup porte by the said flulcrum 4rod and link, e0 said levers being pivotally connected with the said valves at one end, and means for operating the said valves inde endently et each other connected to the otiier end portions of the said levers.

3. In a valve gear, a gas valve and anv air valve provided with concentric stems, af

' pivot-ed ulcrum rod, a lever pivoted at its middle part to the 'free end portion of the fulcrum rod and having one end portion pivoted to the' inner valve stem, linlrs piv-'A oted to the ulcrum rod concentric with the said lever` .,-a'second lever pivo'ted at its middle part to Vthe said links and havlng one end portion pivoted to the outer valve' stem, and means connected to the otherend portions or the said levers and operating them at intervals to open the valves.

4. In a valve gear, a gas valve and an air valve provided with concentric stems, two plvoted operating levers connected to the' said stems, two vaive rods arranged concentrically and operatively connected with the said levers, a stationary casing provided with a guide for the outer valve rod to slide in and having a partition which divides it into two chambers arranged end to end,4 abutments secured to the. respective valve* rods and arra'nged in the sald chambers, closing springs arranged in the said chambers and bei ring against the said abutments, and means for, Asliding the said rods longitudinally to open the valves against the pressure of the said springs.

5.v In a valve gear, a gas valve and an air 12Ey valve rovided with concentric stems, a pivoted ulcrum rod. a lever formed of two parts which st-raddle and are pivoted to the tree end portionof the fulcrum rod and having one end portion pivoted to the inner valve stem, links pivoted to the fulcrum rod valve stem, and means connected to the otlxer concentric with and straddling the said Ileend portions of the said levers and operating ver, a second lever formed m two. arts them at intervals to open the valves. 10 spaced wider apart than the parts o the In testimony whereof I have ailxed my 5 first said lever and having its middle part signature.`

ivoted to and straddling the said links and iaving one end portion pivoted to the outer ALBERT HARRIS.

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