USRE13099E - Valve-gear for explosive-engines - Google Patents

Description

W. J. MCVIGKER. VALVE GEAR FOR EXPLQSIVE ENGINES. APPLICATION mum 31125, I905.

Reissued Apr 5,1910;

' UNITED STATESPATENT OFFICE.

WALTER J. MOVICKER, OF ALMA, MICHIGAN, ASSIGNOR T ALMA MANUFACTURIN COMPANY, OF ALMA, MICHIGAN.

VALVE-GEAR son nxrnosxvn-nngmns.

Originnl No. 743,915, dated NovemberlO,

" To all whom it may concern: I

. it known that I, WALTER J. MCVi KER, a citizen of the United States, formerly residing at Rogers, in the county of Colfax provide a simple means for operating the exhaust-valve by the explosion-of gas or gasolene vapor in an auxiliary cylinder con-.

taining a movable piston, thus dispensing with all gears, cams, eccentrics &c.

I will descrlbe a valve-gear tor explosive engines embodyin my invention and then point out novel eatures in the appended claims. v Reference is to be had to the accompanying drawing, forming a part of this specification, in which the figure is a'longitudinal section of a gas-engine embodying my invention. 7 p 4 Referring to the drawing, 1 designates the main cylinder, in which the main piston 2 operates, said piston having connection with a crank 3 on the, driving-shaft 4;. .The inletchamber is indicated at 5 and the exhaustchamber at 6. The inlet from the chamber 5 1s controlled by a valve 7, held normally a ainst its seat by means of a spring 8; T e inlet and exhaust chambers communicate with the main cylinder through the port 9. Attached to the main cylinder. is an auxiliary cylinder 10, having ports 11 and -12, communicating with the main cylinder.

Operating in the auxiliary cylinder is a piston 13 having an annular port 14 and ports '15 leading therefrom to the rear side of the .piston' The exhaust-valve 16 has its stem 17 loosely engaged with the piston 13, and surrounding said stem 17 is a spring 18. The spring 18 bears at one end against an abutment on the stem and at the other end against a wall of the exhaust-chamber,

- From a sparking device 19 in the main cylinder wires 20 21 lead to the seconda of an induction-coil 22, and from'the prn wary of the inductionco'ila wire 23 leads to connection with the frame of the engine,

' Specification of Reissu'ed Letters Patent. Reissued Apr. 5, 1910.

1903, Serial No. 124,348. Application for reissue filed January 25, 1905. serial No. 242,700. g

and a wire 24; leads to connection with a contact-point 25, seated in a collar26, of insulating material, arranged around the shaft 4. This collar is provided with a hand c- 27,

J The operation is as 'follows: As the main piston moves outward on its suction-stroke, the admission-valve 7 is opened against the resistance of the spring 8 by atmospheric into the cylinder 1. /Vhen the line as of the piston 2 reaches the line 912, it has uncovered the passage or ort 11,'which leads to the auxiliary cylin er and through .the piston 13. As the piston 13 is detached from the valve-stem 17, it is free to move inward against the resistance of a spring 30. The said spring 30, it may behere stated, has less resistance or is weaker thanthe spring 8 forthe admission-valve, so that when the line a; of the piston 2 moves from m to n the cylinder 10 or rather the space or chamber on the left-hand side of the piston 13 will be reduced below atmospheric pressure by the opening therefrom of the passages or ports 15 and 11, to the main cylinder, inasmuch as the main cylinder 1 is at this time (with the main piston on its suction stroke) slightly below atmospheric pressure, and the close the circuit pressure, and an explosive mixture is drawn stroke when its line 00 reaches the linen, and

the main cylinder now contains an explosive mixture of gas or vapor. At the beginning of the compression'stroke of the main piston 2 the rarefaction in the main and auxiliary'chambers'is relieved and the spring 30 is free to exert'its stress on the piston 10-to' drive it toward the right, and as the main piston 2 moves from n to m on its compressionstroke, the increased pressure of the explosive mixture and the stress of-t-he spring 4 30 act to As the mainpiston 2'moves from mto m'on its compression stroke, 1t expels a portion of the explosive mixture from the cylinder 1 through the assages 15 and 11, into the auxiliary cylinder and fills it with an explosive mixture. When the piston 2 completes its compression-stroke, the explosive mixture in the.,cylinder is ignited by a s ark from the plug 19, The expansion 0 the burning gas moves the main piston outward, and when its line as uncovers the passage 11 the burning gas in the cylinder ignites the explosive mixture in the auxiliary cylinder by coming in contactwith it through the passages 11 and 15. The explosion of 'gas in the auxiliary cylinder now moves the piston 13 outward against the resistance of the spring 18, and thus opens the.

exhaust-valve. The main iston doesnot uncover the passage 12 on its outer stroke,.

and when the auxiliary piston 13 moves out the passage 15 disconnected from the passage 11, so that the pressure is sealed in the auxiliary cylinder, and thus the exhaustvalve is held open until this pressure is relieved. The main piston 2 now moves iiiward on'its expelling stroke, and when its line 0 reaches the line a it has completed its expelling stroke and uncovered the passage or port 12 whichrelieves the pressure in the cylinder 10 and allows the spring 18 to close the exhaust-valve 16. This pressure which is relieved or rather exhausted to atmosphere is the excess pressure, that is, pressure in excess of atmospheric pressure, resultin from the explosion which has just taken p ace in the supplementalor auxiliary cylinder 10. Thus one cycle of four strokes is completed. The speed is controlled by interrupting the electric current used to ignite the charge, and thus'preventing an explosion, as follows: It may be here stated that thecontact or brush 28 is' mounted on a block 31 of in sulating material and carries a contact point 32 for engaging with a block 33 in electric connection with the fly-wheel.. As the contactor brush 28 is moved around the collar.

26, it will come in contact with-the contact 25, closing the primary to produce the spark In case of overspeed the centrifugal force will cause the block 33, which is mounted on a spring-plate, to separate from the con-' .tact-point 32, and thus interrupt the primary current, which will prevent an explosion until the speed falls to the normal. The sparking device and governor, however,

' form no part of the present invention.

passage 11 is It will be noted that the onl opened at the outer end of the stroke an the (passage 12 is only opened at the inner en and that the piston 13 forms a valvular appliance for holding the pressure in the auxiliary cylinder.

I claim: I

1. In an explosive engine, the combination, with the main cylinder and a piston and subsequent to the explosion in the main exploding said charge, and an exhaust valve so for venting the roducts of combustion, of pressure-operate mechanism for opening said valve comprising an auxiliary explosion cylinder and an auxiliary piston theremechanisin including. an

in operatively connected with said valve and 5 actuated by the force of an explosion in said chamber separate from and subsequent to the explosion in the main cylinder.

- 3. In an explosive engine of the four cycle type, the combination of aunain cylinder 0 having inlet and exhaust ports, a main piston operating therein, an auxiliary cylinder having its outer end constantly open to atmospheric pressure, an auxiliary piston movable therein and yieldingly spring- 5 pressed toward saidgouter end of the cylinder, said'cylinders being provided with port communication connecting them near the endl of the outstroke of the main piston and sai cylinder being arranged to be moved inwardly by atmospheric pressure when so connected during a charging stroke of the main piston and moved outwardly when the rarefaction in the main cylinder is relieved, and an exhaust valve operatively connected with said auxiliary piston.

4. In an explosive engine, a main cylinder having inlet and outlet ports, a main piston operating therein, an auxiliary piston having port communication with inder, a piston operating in the auxiliary cylinder, the said piston having an annular port, and ports leading therefrom to the rear the main cylof the piston, and a valve for the exhaust'1'15 having loose connection with the piston in the auxiliar explosion 0 gas or vapor mixture in said auxiliary cylinder, while one of the ports is closed by the piston in the main cylinder. 12D

5, In a gas engine, a main cylinder, a ma n piston operating therein, an inlet chamber and exhaust chamber, the said chambers being in port communication with the main cylinder, valves for said chambers, I25 w an auxil ary cylinder having two port-s com- .mun cating with the main. cylinder, one rearwardof the other, a piston operating in said auxiliary cylinder and having ports in connection with the portsleading to the main" 13o cylinder and operated by the spring-pressed piston in the auxiliary 100 cylind er.

cylinder while the main piston is in forward position, and the said main piston operating to cut oif the communication when in rearward position, and a stem extended from the exhaust valve and having loose connection with the piston in the auxiliary 6. In a gas engine, a main cylinder, a main piston operating therein, an inlet chamber and exhaust chamber, the said chambers communicating with the main cylinder, an inlet controlling valve, a spring for holding said valveto its seat, an exhaust valve, an auxiliary cylinder having two '1 ports communicating with the main cylinder and adapted to be cut oil by the main piston, a piston operating in the auxiliary cylinder and having ports normally communicating with the first named ports, a spring engaging with said piston and having a less resistance than the spring of the inlet cont-r01 ling valve, a stem extended fron the exhaust valve and having loose connection with the piston of the auxiliary cylinder, and a spring for holding said exhaust valve to its Seat.

7. In an explosive engine, a main cylinder,-

a main, piston operating therein, a springpressed inlet valve having port communica- 'tion with said cylinder, an auxiliary cylinder, an auxiliary ,plston in said cylinder, a

spring yieldingly pressing said piston toward the outer end of said auxiliary cylinder and having less resistance than the spring controlling the inlet valve, said main cylinder near the end of the'out stroke of the main piston being in port communication with said auxiliary cylinder, and an exhaust valve operatively connected with thepiston in the auxiliary cl1amber-.-

' 8. In an explosive engine of the four cycle type and having a main cylinder, a main piston opera-ting therein and a spring pressed inlet valve having port communication with said cylinder; an auxiliary cylinder; anauxiliary piston in said cylinder; a spring yieldingly pressing said piston toward the outer end of said auxiliary cylinpheric pressure on t der, said cylinders being rovided with port communication uncover by the main piss ton near the end of its outward stroke and the stress of said s ring yielding to atmos- Iie outer side of the auxiliary piston when said cylinders are in communication during the suction stroke of the main piston; an exhaust valve loosely connected withsaid auxiliary piston and arranged to be operated by 1t; and means for venting the pressure in said auxiliary c linder at the end of the exhaust stroke 0 the main piston.

9. In an explosive engine of the four cycle type and having a main cylinder rovided with inlet and exhaust passages an a main piston reciprocating in said cylinder; an auxiliary cylinder having two ports communicating with two corresponding ports inthe' main cylinder, the rear-most of said ports in the auxiliary cylinder communicating with atmosphere when its communicating port in the main cylinder is uncovered by the main piston at the end of the inward movement of such piston; an auxiliary piston in such auxiliary cylinder provided with passages and ports connecting theforemost of said two ports in the main cylinder with.

said auxili 7 cylinder in the intermediate and inward positions of such auxiliary piston and in its outward position cutting off such communication; a spring tending to move said auxiliary piston outward in said auxiliary cylinder, sa1d main piston near the end of its outward stroke uncovering the forward one of saidtwo ports in the main cylinder and the stress of said spring yielding to atmospheric pressure on the outer side of the auxiliary piston when said cylinders are in communication during a suction stroke of the main piston, and .an exhaust valve arranged to be operated by said aux= 'iliary pisto WALTER J. McVICKER.

Witnesses:

LOUIS B. ERWIN,

S. E. HIBBEN.

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