US920991A

US920991A - Valve mechanism.

Info

Publication number: US920991A
Application number: US39888507A
Authority: US
Inventors: Harry Edward Perrault
Original assignee: Individual
Current assignee: Individual
Priority date: 1907-10-24
Filing date: 1907-10-24
Publication date: 1909-05-11
Anticipated expiration: 1926-05-11

Description

11. E. PERRAULT; VALVE MECHANISM.

, APPLIUAIION FILED OUT-24, 1907.

920, 99 1 Patented May. 11 1909.

FIE E--.

THF. NORRIS PETERS 00., WASHINGTON, 04 c,

TNTFETC,

HARRY EDWARD PERRA-ULT, OF DETROIT, MICHIGAN.

VALVE Mn orrAnIsM.

To all whom it may concern:

mom, a citizen. of the 1 United" States, and

residing at Detroit, in the countyoi vVayne.

and State of Michigan, have invented a new and useful Valve Mechanism, of which the following is a specification. v

This invention relates to valve mechanism for explosive engines, particularly to those of the four cycle type, and especially to the valve mechanism for controlling the escape of the burned gases.

The obj ect of this invention is to provide an exhaust valve which will befope'rated by the burned sage, and which will be under the control of the inlet valve as to the time of closing this exhaust passage.

A further object of, this invention is to provide a simple automatic eXha'ustvalve mechanism for explosive englnes which Is operable entirely independently of the crank shaft of the engine. My invention consists 1n a valve to normally close the exhaust passage, which valve will be operated to open the exhaust passage by the burned gases in the cylinder when the piston has reached the. end of its operative stroke, and which valve-will be held in such position'tha't the exhaustport remains open until the piston begins its charging stroke.

My invention is illustrated in the accompanying drawings, wherein Figure 1 is a view of an engine cylinder with the exhaust valve easing shown in section. Ellis cylinder on a plane'at right angles to Similar reference characters refer to like parts throughout the several views.

The cylinder 1 is provided with theusual water passages 2 111 its walls and-may beprovided witlrany desirable type of spark plug 3. The inlet valve casing 41: connects to the carburetor by means of a pipe 5.- This.

casing is provided with a valveseat 6 and ports 7, a valve 8 is movable horizontally in this casing and has connected to it a stem 9, and is normally held'in its seat by means of the spring 10.

The cylinder may be provided withian ex-- haust port llwhlch opens-into the exhaust pipe 12. A second exhaust port 13 opens into the passage 14 which leads into the lower end of the valve casing 15. A plug Fig. 2 is a central vertical section of 7 Specification of Letters Patent.

Patented May 11, 1909.

- Application-filed October as, 1907. Serial No. 398,885.

l of any desired type closes the lower end Be itknown thatfI, HARRY EDWARD PER- on the stein 23. The conical head 24 .at the upper end of the stem is adapted to engage the shoulder 25 on the leaf-spring 26 as shown in dotted lines in Fig. 2. The stem 9 .of the inlet valve 8 is reduced at 26 and fits into a slot at the upper'end of this leaf- Espring. gasesto open the exhaustpas- At the lower end of the. pipe 20, in a bore ,of the valve casing 15,'is an auxiliary valve v27 normally held upwardby the sprmg 28.

The strength of'this spring is such that the valve 27 will under ordinary conditions be held over the passage or port 19 but with the least pressure in the pipe 20, the valve 27 ;will descend, opening the port 19. The pisfton 30 is shown at the lower end of the stroke and the valves are shown in their positions at the end of a charging stroke.

The operation of the valve mechanism is as follows: The parts being in positions shown in the drawings, at the end of the s charging stroke, the piston 30 in rising will compress the charge and the usual explosion will again drive it down to the position shown in the drawing. When this occurs, the cylinder will be full of burned gases under pressure, and as soon as the ports 11 and 18 are open, these gases will rush out through these ports, a portion escaping through the pipe 12, and a portion through the passage 14, raising the valve 21 until the port 17 of the casing 15 is open, when they will escape through the pipe 18.

'VVhen this valve 21 is raised the conical head 24, at the upper end of its stem, will Jengage-the shoulder 25 on the leaf-spring 26 and the valve will be held above the port 17. The piston'30 in its upward stroke to clear the cylinder ofburned gases at once closes the ports lland 13. The valve 8 be ing seated, the gases are forced down through the pipe 20. The slight pressure thus occasioned will depress the small valve 27 to open the port 19 when the gas will rush down through the pipe 20, through the port 19 into the casing 15 and escape through the port 17 in pipe 18. This permits the burned gases in-the cylinder to escape to the same'extent as is usual with four cycle engines. The piston in descending will at once relieve the pressure in the pipe and the valve 27 will immediately close the port 19. Further movement of the piston will cause sufiicient vacuum in the cylinder to open the valve 8 and permit the explosive charge to pass into the cylinder. At the end of the stroke of the piston the valve 8 will be seated through the action of its spring 10. The cylinder being full of explosive mixture, no free air will enter through the port 11. At the first opening of the valve 8 the shoulder on the leafspring 26 is pulled from under the head 2% on the stem of the valve 21, permitting the spring 22 to depress this valve 21 and close the port 17. The parts are now in the same position that they were at the beginning of the cycle just described.

The port 11 and pipe 12 are not necessary to the operation of this engine but by the use of this port and pipe, the size of the port 13, the chamber 15, the port 17 and the valve 21 are decreased.

The relative positions and sizes of the different parts of this mechanism and their details may be varied according to the different types of engines upon which such valve mechanism is adapted to be used.

aving 110W explained my improvements, what I claim as my invention and desire to secure by Letters Patent is 1. A valve mechanism for explosion engines, comprising a cylinder, an exhaust valve casing connected thereto, a valve in said casing adapted to close an exhaust port of the cylinder and adapted to be moved from said closing position by the burned gases of the engine, an inlet valve, and

means under the control of said inlet valve for holding the exhaust valve in position open during the exhaust stroke and for releasing said valve so it may close said exhaust port.

2. A valve mechanism for tour-cycle explosive engines, comprising an exhaust valve, a chamber therefor having an inlet port from the engine cylinder which is uncovered by the piston of the engine at the end of its stroke, an exhaust port, and a third port connecting to a passage leading to the explosion or upper end of the cylinder, said valve adapted to normally close the passage between the cylinder and the exhaust port and the passage to the upper end of the cylinder, but adapted to be moved from such position by the burned gases of the engine when the inlet port is uncovered by the piston of the engine to permit the escape of said gases during the cleansing stroke of the piston.

3. A valve mechanism for explosion engines comprising a cylinder provided with an inlet and an exhaust port, a. valve normally positionedv to close the exhaust port and to be moved to open the exhaust port by the burned gases of the engine, an inlet valve, and means under control of the inlet valve to hold the exhaust valve at one end of its movement;

In testimony whereof, I have signed this specification in the presence of two suit scribing witnesses.

HARRY EDWARD lllliliAllh'l.

Witnesses AnoLrii RUHL, HARRY Srnnzenn.