US1253933A - Internal-combustion engine. - Google Patents

Description

J. w. BURKETT'.

INTERNAL COMBUSTION ENGINE APPLICATION FILED JAN. 29. 1916.

1,253,933. Patented Jan. 15,191&

J. W. BUHKETT. INTERNAL COMBUSTION ENGINE.

APPLICATION FILED JAN.29. 1916. I 1,253,933. Patented Jan. 15, 1918.

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" ization'by subjecting the incoming gases. to

UNITED STATES NT OFFICE COMPANY, OF COLUMBUS, OHIO, A CORPORATION OF OHIO."

- INTERNAL-COMBUSTIONENGINE,

To all whom it may concern:

. Columbus, in the county of Franklin and '5 State of Ohio, have invented certam new and useful Improvementsin Internal-Combustion Engines, of which the following is a specification.

g This invention relates to internal combustion engines and is directed principally to the provision of an improved type of valve structure, for governing the admission to and exhaust from the engine cylinder. In this connection, thefmain object of my invention resides in the provision of a single valve, by means of which both'the fresh and the burned gases are effectively controlled to and from the engine cylinder.

A further object of my invention resides in a structure of this type whereby leakage of the gases from the cylinder, especially on the compression stroke, is effectively overcome. ,Inldoing' this, I also so arrange this structure that the movin parts are well lubricated and also may he maintained in ,a comparatively cool state.

Still. a further object of my invention "resides in the combination of a sleeve valve and ,apuppetvalve, the puppet valve being the prlmary valve, by means of which the gases 'tojand from. the engine cylinder are controlled. The sleeve valve. is arranged to. uncover the exhaustand intake passages atfthe propertime, while the puppet valve itselfis arranged to control these gases as .far as the engine cylinder. directly, 1s concerned; By this arrangement, both theexhaust, and the intake ""gases must pass the puppetvalve'and by means of this the pup- 'et;.. valve is. cooled to an appreciable]. extent y coming in direct contact with the incoming gases onthe suction'stroke of the en- 'gineand, further, these incoming gases are heated to an appreciable extent to. assist comparatively warm puppet valve. It will, therefore, appear that a, two-fold purpose is accomplished, that of keeping the puppet valve inja statev of coolness which will preyentjits warping and also of assisting vaporadditionalheat asthey enter the engine lcylinder a Other objects of my. invention Wlllg become umo aappar nt a t r a fur er eta led. e-

Speclfication of Letters. latent.

head, asis shown, audit is within thiscome vaporization by coming in: contact with, the

. Jenn w. nunxn'rr, or COLUMBUS, OHIO, ASSIGNOZR-TO THE nunxnr'r MANUFACTURING Patented Jan. 15, 1918]. v Applieationfiled January 29, 1916. SerialNo; 75,160.

scription of the accompanying sheets of drawings, in which Similar characters of reference designate corresponding parts, and in which: I

Figure -1 is a vertical sectiontakenthrough the end of the cylinder carrying my in proved valve structure, a Fig. 2 is a side elevation of the structure shown in. Fig. 1, v i i Fig. 3 is a top plan view of the valve actuating mechanism as shown in Figs. 1 and 2, i

Fig. 4 is a section taken Fig. 1, and, a a

Fig. 5 is an end elevation of the strucon line 4-4, of

ture shown in Figs. land ,2.

In these several views, the engine cylinder 18 shown at 1 and this cylinder; is provided with a hopper2 which contains the cooling head integral with the cylinder; and. pro vided the same with anexhaust passage 3 and an intake passage l into which pipes and. 6 respectively, are threaded, which leadft o the muffler or directly into the, atmosphere-and to the carburete r generator respectively Both of these passages communicate with a common passage preferably disposed in the center of the cylinder mon passage that itself located.

This, valve mechanism comprises a cage member 7 closed at its outer end asis shown at8 and open at its inner end and-formed the valve mechanism is at its: inner end? With'a e seat, as is shown at9. This valve seat is preferably of the tapered type, which taper leads in such direction. that the valve 10 operating in. conjunction with it, is. pressed thereagainst by the compression within the cylin-f deritself. This cage is also providedwith;

a series of spider arms 11 at.its innerend and this head 8 is apertured to slidably. re i ceive the valve stemshown at 12,1it being this valve SlZEl'Il 12 which carries thepuppetf valve 10. at its; innerend, The cage Tie further slotted. at its fiupper and lower" sides as is shownat 13 and} 14 respectively, to

be in. alinement with-the respective exhaust,

and intake passages 3 and 4. Mounted in coiiperative relation with the cage 7 and supported thereon is a hollow sleeve valve 15, which sleeve is provided with the slotted openings 16 and 16. This sleeve, is made to have a working fit with the engine frame and also with the cage, while its outer end projects beyond the engine framework and is provided with a segmental rack such as is 10 shown at 17. The manner of operation of the sleeve valve is such that its opening 16' passes the intake passage 4 during the suction stroke of the engine and the opening 16 asses the exhaust passage 3 during the ex haust stroke of the engine. Meanwhile, suct-ion created by the down stroke of the engine piston causes the puppet valve 10 to open to permit the influx of a fresh charge, while on the exhaust stroke, mechanism is 20 provided for positively opening this puppet valve to permit the out-flow of the exhaust gases. In this manner, both the intake and exhaust gases pass the valve 10 and, therefore, the heat interchange described in the foregoing part of this specification, will take place. It will be noted also that the puppet valve 10 opens in such direction that the pressure within the engine cylinder on the compression and expansion stroke will tend to force this valve 10 against its seat 9 to prevent leakage and in order to pre vent leakage between the cage 7 and the engine framework, I have provided this sleeve with an annular shoulder 18 whose tapered face' cooperates with a similarly formed shoulder and face 19 of the engine framework. It is desirable that the cooperating faces formed by the shoulders 18 and 19 should be made very exact, which may be 40 accomplished by grinding, or they may be suitably packed in order to prevent leakage of the gases from the engine cylinder through this point of connection. It will, therefore, appear that if this joint between the surfaces formed by the shoulders 18 and 19 is made tight in any one of a. number of practical ways in which this may be accomplished, the compression within the cylinder ,will always be held, inasmuch as it is only about the valve 10 that these gases can then escape. This valve is held against its seat by the internal pressure within the cylinder and is further prevented from warping by the cooling effect produced by the incoming gases and by the cooling effect of the water in the jacket space 20.

The actuating mechanism for the valve structure will now be described: It is desirable that the cage 7 should be held tightly in position to prevent its rotation and also to have a wedging bearing between the surfaces formed by the shoulders 18 and 19. This is. accomplished by means of the frame piece formed by the arms shown at 21, 22 65 and 23, the arm 22 being provided with a 'on a stub shaft 34 rigidl hub 24 through which the valve stem 12 passes. This hub is made to bear against the head 12 of the cage 7 by tightening of the bolts or screws 25, which hold this frame piece'in position and in this manner the cage may be wed ed against its seat the desired extent. ThlS three arm framework 1s further provided with a rearward extension 26, which extension is L-shaped in general contour as is shown particularly clearly in Fig. 3, the portion 27 of this extension lying in central alinement with the center of the valve structure as a whole and theen= g'ine cylinder and being bored to slidably receive the 'valvestem 12. This valve stem continues rearwardly from this point and is provided at its outer end with a washer shown at 28. A spring 29 is located between the portion 27 of the three armed framework and the washer 28, in order that the valve 10 may always be held a ainst its seat. This spring has a. tension su 'cient to always seat the valve 10, but is also weak enough so that the suction stroke of the engine will .open

the valve to permit the inflow of gases. It

will be noted that this may be very readily accomplished, inasmuch as the spring 29 is located at a point remote from the intense heat created by the burning gases and, therefore, it will retain its temper.

The mechanism provided for positively opening the puppet valve 10 on'the compression stroke, comprises a finger 30 rigidly secured to the valve stem and arranged in such position to be engaged by the cam surface 31 carried by an arm 32 which latter is integrally formed with the casting shown at 33. It will be noted that this cam surface is so inclined that the upper edge will be the initial portion to strike the finger 30 and because of the slower rate of movement of this portion as compared with the farther end, there will be less likelihood of a pound. After the upper ortion has come into engagement, the remainder will gradually contact with the fingerBO as the arm 32 continues to swing in a forward direction.

This latter casting 33 is rotatably mounted secured. to the L- haped extension 26. T is casting 33 is further provided with a segmental gear,

shown at 34, designed to mesh with the segmental rack 17 and also with a down-stands ing arm 35 which is designed to be connected to the rod shown at 36, which latter runs to any desired portion of the engine mechanism for giving the desired valve motion. It will be noted that the motion desired is that of either an eccentric or crank, so that the rod 36 will be given a movement back and forth.

The manner of operation of the actuating mechanism is as follows: A pull on the rod 36 will rotate the sleeve valve in a counter clockwise direction, which brings the slot i 9 said cage.

mam

16 opposite the exhaust passage 3 and breaks the connection of the slot 16 with the intake passage. Before the piston has reached the endqof its exhaust stroke, the rod 36 will have begun a rearward movement, so that at the end of the exhaust stroke the slot 16 will be in a position just preceding its communication with the intake passage 4.

"Therefore, on the intake stroke this slot will move past the intake passage and the communication between the exhaust passage and the cylinder will be broken. This oscillatory movement is maintained throughout the continued operation of the engine and in this manner the intake and exhaust gases are controlled as has been previously related.

What I claim, is:

1. In an internal combustim engine providedwith intake and exhaust passages, a common passage leading into the engine cylinder and communicating with both the intake and-exhaust passages, a cage member located withm said common passage and provided with a valve seat at its inner end, a

ollow sleeve valve supported by said cage member, means for turning said sleeve valve in such manner to uncover said intake and exhaust passages in their proper order, and a primary valve worklng on the valve seat of 2. In an internal combustionengine provided with intake and exhaust passages, a common passage leading into the engine cylinder and'communicating with both the in topic: of this patent may be obtained for live cents each, by addressing the "commissioner of Washington, D. C. a

take and exhaust passages, a cage member located within said common passage and provided with a valve seat on its inner end a hollow sleeve valve supported on the exterior of said cage member, means forvlmparting mot1on to said sleeve valve to uncover sald lntake and exhaust passages m" a turnin their proper order, and a primary valve working in the valve seat of said cage.

3.. In an internal combustion englne pro-- vided with intake and exhaust passages, a

common passage leading into the engine a cylinder and communicating with both the intake and exhaust passages, a cage member located within said common passage and provided with a valve seat on its inner end,

a hollow sleeve valve supported by said cage member, means for impartinga turning motion to said sleeve valve to uncover sa d intake and exhaust passages in their proper order, a primary puppet valve worklng on puppet valve slidably supported in said cage member and projectlng out through the rear end thereof, and resilient means operatively' engaging theend of said stem projecting out of the rear of said cage member.

In testimony whereof I afiix my signature in presence of two witnesses.

JOHN W. BURKETT.-

Witnesses:

C. B. HARDMAN, WALTER E. L. BOOK.

Ilhntl,

56 the valve seat of said cage, a stem on said

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