US1259391A - Two-cycle engine. - Google Patents

Description

H. W.- GILDERSLEEVE. TWO-CYCLE ENGINE.

APPLICATION FILED, we, L6. 1915.

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Patented Mar. 12, 1918.

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TWO-CYCLE ENGINE.

APPLICATION FILED AUG. t6. 1'9l5.

1359391. Q Patented Mar. 12, 1918.

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ii'n'rrnn trains Parana HOWARD W. GLaiLERSLEEVE, OF SAN FRANCISCQ, GALIFOBNIA.

TWO-CYCLE ENGINE.

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To all whom it may concern:

Be it known that I, HOWARD W. GILBER- snnnvn, a citizen of the United States, residing at the city and county of San'Francisco and State of California, have invented new and useful Improvements in Two-Cycle Engines, of which the following is a specification.

This invention relates to a two-cycle engme.

One of the objects of the present invention is to provide a simple, substantial twocycle engine of the double cylinder opposed type and particularly to provide meansffor accomplishing a more complete scavenging of the firing cylinders, vand a partial cooling of same together with the pistons and exhaust valves.

Further objects will hereinafter appear.

The invention consists of the parts and the construction and combination of parts as hereinafter more fully described and claimed having reference to the accompanying drawings, in which Figure 1 is a plan view of the engine partly in section.

Fig. 2 is a longitudinal, vertical section of same.

Fig. 3 is a longitudinal plan section.

Fig. 1- is a partial cross section on line 4-4, Fig. 2.

Fig. 5 is a cross section on line 5-5, Fig. 2.

Fig. 6 is a cross section on line 6-6, Fig. 2.

Fig. 7 is a cross section on line 7-7, Fi 2.

fieferring to the drawings in detail, A and B indicate a pair of opposed cylinders, each of which is divided into two chambers, such as indicated at 2, 3, 4 and 5 by means-of partition members 6; chambers 2 and 4 being the firing chambers and chambers 3 and 5, compression chambers. Mounted in each cylinder is a pair of connected pistons, such as indicated at 7, 8, 9 and 10, which are connected with a crank shaft 11 by means of connecting rods 12 and 13;

Formed at the end of each firing chamber,- is an auxiliary exhaust port 1e and adapted to open or close said ports are valves 15, which are operated from a cam shaft 16 by means of links 17 and rocker arms 18, pivotally mounted, as at 19, on the housings inclosing valves 15, Formed in the upper portion, near the inner-end of each firing cham- Specification of Letters Batent.

Patented Mar. 12,1218.

Application filed August 16, 1915. Serial No. 45,648.

her, is an exhaust port 20; each exhaust port 20 consisting of a plurality of rectangmlar shaped openings which communicate with a chamber 21; the escape of exhaust from chamber 21 being in turn controlled by a valve 22, which is operated in unison with valve 15 by the means heretofore described.

-The exhaust then escapes through ports23 end with the intake ports 2% and 25, formed in the firing chamber 2, while the opposite end communicates with an inlet port 28, formed in the compression cylinder chamber 13. Passages 26 and 26 run parallel with each other, and are in this instance cored out in the crank base andadjacent cylinders, see Figs. 2 and 3 and 7. Mounted in the end of each firing cylinder is a spark plug 30, and mounted in the end of each firing cylinder is a fuel injector or spray nozzle 31, of suitable construction, by whichfuel is injected when the adjacent piston has compressed a chargeof fresh air, as will hereinafter be described. The injectors are operated by fuel pumps in the usual manner, not here shown.

Theoperation of follows:

Referring to Fig. 2, it will be seen that the engine will be as There are two toy piston 9 is in a position where a charge of air has been compressed and where fuel may be admitted through nozzle 31 and ignited by spark plug 30. The combustion and expansion taking place will cause pistons 9 and 10, t0 move in thedirection of arrow and exhaust will take place the moment ports 20 are uncovered, the timing of the cam shaft 16 being such that valves 15 and 22 are simultaneously opened; the expanded charge is in this manner permitted to escape at both ends of the cylinders through ports 1.4 and 20 with connected valves; thus reducing the charge to atmospheric pressure, Pistons 8 and 7 will also move in the direc ion of arrow a in unison with pistons 9 an 10; a charge of air previously admitted into compression chamber 3 will in this manner be compressed and by-passed 'through ports 25 the moment these are uncovered, by a further movement of the-piston 9 in the direction vindicated. A fresh charge of air admitted-from the compression chambers through passage 26 and ports .such that they will close a moment after the port 25 is uncovered. They are, however, sufficientlylong to release a sufficient amount ofthe fresh. air chargeto scavenge the cylinder and are then closed to permit the remaini tion, but lsmore eflicient in operation than ing air to completely fill the firing chamber- 4:, and this charge of air will be compressed on the reverse movement of piston 9.

The moment-pistons 9 and 10 move in the opposite direction to compress the charge air admitted from the compression chambers through ports 2% and 25, a fresh charge of air will be admitted through exhaust valve 22, valve 22 being in this instance opened by the suction or vacuum produced by the reverse movement of the pistons; valve 22 not only in tliis'manner admits sufiicient air to relieve the vacuum caused in chamber 4 back of piston 9, when it moves to compress the charge previously admitted, but it also supplies air by means of ports 24: and 25 to passage 26 and the connected The compression chamber 3.

fresh charge of air admitted through Valve 22 by suction being used'as previously described, first, to completely scavenge the firing chamber 4; and second, to charge same with air for the next operation of piston 9.

.From the foregoing description, it will be seen, that pistons 8 and 9 cooperate to scavenge and charge the firing chamber t. The cycle of operation in the firing chamber 2-is exactly the sameas thedescription of firing chamber 4,- In this instance, pistons 7- and 10 cooperate to charge the firing chamber 2.

An engine constructed as here shown, is not only simple and substantial inconstrucscavenge and the standard forms of two-cycle engines now in use.

1st. A more complete scavenging is ef-' fected by the arrangementof the connectedpistons described.

2nd. A. more complete cooling of the cylinders is obtained by the intake and expulsion of air, andalso a more complete cooling of valves'and pistons.

3rd. No Waste of fuel mixture-takes place, as the fuel isonlyf admitted at the point of compression, where it is all'consumed When' the charge is ignited by means of plug 30.

Valves 22 arranged as here shown, are not only mechanically operated by means of the cam shaft with connected. links and rocker arms when exhaust takes place, but are also operated by suction when the pistons move the vglves together with the positions of the cylincers, does not form any feature of the present invention, as they might be arranged vertically or otherwise, where conditions might require, thus considerably changing the arrangement of valves and bypass passages 26 and 26*.

By referring to Fig. 2, it will be seen that each firing chamber is provided with a downwardly extending flange or bafiie member l0. These are positioned directly opposite the spray nozzles and are provided for the purpose of further atomizing and breaking up the fuel discharge.

The materials and finish of the several parts of the device, may be-such as the judgment and experience of the manufacturer may dictate.

I wish it understood that various changes in form, proportions and minor details of construction may be resorted to within the scope of the appended claims, and that I do notv wish to limit myself to the specific design and construction here shown.

Having thus described my invention, What I claim and desire to secure by Letters Patpression chambers, means for conveying the charge of two compression chambers in unison to one firing chamber, and means for releasing a portion of said charge to scavenge the firing chamber.

2. In a two-cycle engine, a pair of cylinders, a partition member in each cylinder 1 dividing each cylinder into two compression chambers and a firing chamber, a pair of connected pistons in each cylinder, a crank shaft to which said pistons are connected, a valve in each firing chamber, means for mechanically opening said valves to exhaust the firing chambers,- and means whereby said valves will open by suction to'admit,

. fresh air to the compression chambers.

3. In a two-cycle engine, a pair of cylinders, a partition member in each cylinder dividing each cylinder into two compression chambers and a firing chamber, a pair of connected pistons in each cylinder,.a crank 4. In a two-cycle engine, a pair of cylinders, a part1t1on member 1n each cylinder dividing each cylinder into two compression chambers and a firing chamber, a pair of connected pistons in each cylinder, a crank shaft to which said pistons are connected,

.a valve in each firing chamber, means for mechanically opening said valves to exhaust the firing chambers, means whereby said valves will open by suction to admit fresh air to the compression chambers, means for conveying the charge of two compression chambers to one firing chamber, means for injecting a hydrocarbon fuel into each firing cylinder to produce a combustible mixture, and means for igniting said mixture.

5. In a two-cycle engine, a pair of cylinders, a partition member "in each cylinder dividing each cylinder into two compression chambers and afiring chamber, a pair of connected pistons in each cylinder, a crank shaft to which said pistons are connected, a valve in the inner end of each firing chamher, a valve in the outer end of each firing chamber, means for mechanically opening the inner and outer valves in unison to exhaust t'he firing chambers, and means whereby the inner valves may open by suction to admit fresh air to the compression chambers.

6. In a two-cycle engine, a pair of cylinders, a partition member in each cylinder dividing each cylinder into two compression chambers and a firing chamber, a pair of connected pistons in each cylinder, a crank shaft to which said pistons are connected, a valve in the inner end of each firing chamber, a valve in the outer end of each firing chamber, means for mechanically opening the inner and outer valves in unison to exhaust the firing chambers, means whereby the inner valves may open by suction to admit fresh air to the compression chambers, and means for conveying the charge of two compression chambers to one firing chamber. i

7. In a two-cycle engine, a pair ofcylinders, a partition member in each cylinder dividing each cylinder into two compression chambers and a firing chamber, a pair of connected pistons in each cylinder, a

crank shaft to which saidpistons are connected, a valve in the inner end of each firing chamber, a valve -in the outer end of each firing chamber, means for mechanically opening the, inner and outer valves in unison to exhaust the firing chambers, means whereby the inner valves may open by suction to admit fresh air to the compression chambers, means for injecting fuel into each firing cylinder to produce a combustible mixture, and means for igniting said mixture.

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

HOWARD WV. GILDERSLEEVE. I

W'. W. HEALEY.

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