US1091963A - Two-cycle engine. - Google Patents

Description

A. F. RIBDL.

TWO-GYOLE ENGINE.

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A. F. BIEDL.

TWO-CYCLE mums.

APPLICATION FILED JAN. 20, 1913.

Patented Mar. 31,1914.

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A. r. RIEDL'. TWO-CYCLE ENGINE.

APPLIUATIOH FILED JAN. 20, 1913.

Patented Mar. 31, 1914 LQQ 1 ,9630

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' ALBERT FRED RIEDL, OF BUFFALQNEW YORK."

TWO-CYGLE ENGINE.

. Specification of Letters Patent. Application filed. Jamal- 720,1913. Serial No. 743,153.

Patented Mar.3il,'i914.

To all :whom it may concern:

Be 1t known that I, ALBERT FRED RIEDL, a citizen of the United States, residing at Buftale, in the county ofErie and State of New,

York, have-invented certain new and. useful Improvements in Two-Cycle Engines; and I do declare the followin to befa full, clear, and exact'description o the invention, such as will enableothers skilled in the art to which it appertains to make and use the same. v

This invention relates to internal combustion engines, and more especially to those opcrating on the two-cycle principle; and the object of the same is, chiefly, to simplify the parts of a" gasolene engine of this type to the end that the power may be increased and the gasolene consumption decreased.

Further objects will appear in the followin specification which sets. forth the preferre construction of this engine, as illustrated in the drawings Wherein- I Figure 1 is a central vertical sectional view through one cylinder of this engine, taken along the center of the crank shaft. Fig. 2 is an end elevation thereof, taken Fig. 3 is a plan view, and Fig. 4- is a horizontal section on the line 4-4 of Fig. 1 with the piston and crank shaft omitted. Fig. 5 is across sec-' tion through the upper end of the cylinder, sgowinga slight modification in its internal s ape.

In the drawings the crank case 1 has suitable devices 2 by means of which the cylinder shown is supported from the framework of the machine, and also has flanges 3 bolted to similar flanges 4 at the bottom of the shell 5, half-bearings '6 being formed in said flanges-and adapted to register when these parts are assembled so as to receive the crank shaft 7 as well known in this art. The shell is cast with an upright piston chamber 8, and alongside the same an upright valve chamber 9 which communicates at its lower end through a .passage 10 with the space occupied by the crank 11 and usually known as the pumping'chamber 12', and stud crank is connected by a' rod 13' with the piston 14 which reciprocates vertically within the chamber 8- in the usual manner. The uper portion of the cylinder, or piston chamher 8, is water-jacketed as at 15 on its sides and over its head, and internally the top of this chamber by preference slopes downward as at 16 from the spark chamber 17 to the remote side of the piston chamber 8. for a purpose to appear below. The jacket 15'is also by preference carried around the spark chamber as at 18, and even down within the wall or partition between the chambers 8 and 9 as at 19, though-I do not wish to be limited with respect to the jacket. The upper end of the s ark chamber 17 is closed by a plug 20 which by preference screws into an opening larger than the valve .yet to be described and so that said valve may be re- 'moved when desired, and through this plug extends the spark plug 21 which is connected to an ignition system as usual. Cast around the wall of the main cylinder or shell 5' is a hollow rib 22 containing an exhaust chamber 23 which is in communication with an out-let24 that'may lead .to a mufller not.

necessary to illustrate, and the piston chamber 8 comunicates with the exhaust chamber 23 by means of exhaust openings 25 through v the wall of the shell 5.w ithin the rib 22 as best seen-in Fig. 4. It is to be understood that the throw of the @crank 11 is sufiicient to carry the piston 14 ownward far enough to expose the exhaust o enings 25 at each revolution of the main s aft 7 in a manner well understood in explosive engines of this .actuated check valve which opens to admlt a charge from the carbureter as indicated Resting on a cam 80. secured on the maln shaft 7 isv a head 31 at the lower end of a push rod 32-which extends upward throu h a guide 33 formed within or carried by t e shell 5 of the cylinder-casting, and the up'- per end of this rod is threaded as at 34 opposite an opening 35" in the wall of the valve chamber 9, which opening is closed by a plate 36 held removably in place by tap bolts 37. Engaging said threads is a nut 38, held locked therconby a jam nut 39, said nut 38 being elongated 'ertically, and having an exterior shoulder 40 on Which rests a coiled expansive spring 41. The upper end of this springstands beneath a shoulder 42 formed: around a tubular boss 43 which extends from the center of a spider 44 forming part of a casting whose ring-shaped wall or shell 45 rests upon a shoulder 46 within the valve chamber 9 and is internally beveled at its upper end as at 47 so as to produce a valveseat. Resting upon the latter is the beveled edge of the head 48 of the inlet valve, whose stem 49 passes downward through the bore of said'boss -43,'throughout the length of said spring 41, and into the upper end of said .nut 38, wherein it is by preference secured removably in any suitable manner as by the pin 50 shown in Fig? 1. With this construction it follows that the expansion of the spring 41 tends to move downward the nut and the parts attahced thereto, so that the head 31 is kept in contact with the cam 30, andtends also to move upward the boss 43 and spider 44 whose ring rests upon the shoulder 46 and is held in place by being closely fitted into the upper end of the valve chamber 9. However, when removed therefrom it can be lifted out through the opening disclosed by removing the plug20, as also can the valve when its stem is detached from the nut 38 by withdrawing the pin 50. By removing the plate 36 the opening 35 is exposed so that the operator may pass his hand into the same and gain access to the parts of the valve mechanism for the purpose of adjustment, repair,

' or replacement. Should it become necessary to replace the push rod 32 that can be done when the engine is taken down and the crank shaft 7 and its cam 30 removed from beneath the head 31, after which the entire.

push rod can be drawn downward through the guide 33. However, this will rarely oocur, as the adjustment permitted by the nut 38 and jamb nut 39 will take up for wear, and even a broken spring could be replaced through the opening disclosed by the plug 20.

The operation of a two-cycle engine thus constructed may be briefly described as follows: With the parts standing as shown in Fig. 1 and the charge compressed, when the spark occurs said charge isexploded and the piston descends until it uncovers the ex ha-ustports so that the smoke and burnt gases pass readily through the openings 25 into the chamber 23 and out the outlet 24.

" The descent of the piston will to a slight extent compress the charge within the chamber opening 10 upward into the valve chamber 9,

as the check valve 27 closes to prevent this charge being driven back toward the carbureter. At a proper moment the cam 30 raises the push rod and valve, its head 48 is lifted oil the seat 47, and the charge under slight compression is driven upward into the chamber 17 and admitted at the extreme top of the piston chamber 8 whose beveled upper end 16 causes the 'inflowing charge to be thrown downward onto the top of the outflowing gases, rather than to be mingled therewith, with the result that the gases are forcibly expelled through the openings 25. Just at a proper moment the the-number and size of the e its ascent to compress the .charge within the upper end of the piston chamber 8 and simultaneously to draw a new charge inward through the intake 26the first upward movement of the piston closing the exhaust openings 25. When the piston again reaches the position shown in Fig. 1, the operation is repeated.

A two-cycle engine as thus constructed possesses the following points of advantage: The admission of the mixture into the extreme upper end of the piston chamber, especially when said upper end is beveled outward as shown at 16, is of advantage in a two cycle motor because the mixture is used to expel the gases and yet it does not commingle therewith to any injurious extent. The interposition of the waste gases between this mixture and the head of the piston causes them to act as a cushion and serves to retain the mixture constantly at the top. With the parts properly timed, the

pumping action in the chamber 12 and the high point of the cam 30 will admit the fresh mixture at a time when. the pressure of the inlet and exhaust are the same. I consider it of advantage also tohave the mixture travel constantly in one direction, and the passages for its travel are large and uninterrupted. The positive opening of the inlet valve by a cam mounted directly on the crank shaft prevents the possibility that the engine can be set out of time and avoids the necessity for a cam shaft and the gears con-- necting it with the main shaft. Better combustion results where the mixture is not diluted with the exhaust gases, and the charge is wholly fired when the spark plug is located at a point where there is the least possibility of pollution of the charge. The

larger the area of the piston and therefore the bore of-the cylinder, the eater will be aust openings 25 and therefore the less time required to thoroughlyv exhaust the gases; although there is but a singlerow of openings 25, they 12, which charge is pumped through the .rod is passing horizontally across the lowest point assumed by the crank and when the piston of course has ceased its downward movement and has not quite yet commenced its upward movement. The general structure results in the provision of large passages for the travel of the gas, the fewest number of turns, and the elimination of small by-passes; added to which is the fact that the mixture and the gases are both caused to travel the shortest possible distance, so that resistance to their flow is minimized and an increased efficiency of the engine is obtained. It is hardly necessary to add that a two-cycle; engine is always simpler than one involving a greater number of parts, and the structural features of the engine above described possess, extreme simplicity without sacrificing accessibility.

Fig. illustrates how a deflection or-bafile 16*, may be used in place of the sloping head 16 of the'cylinder, and this bafiie will deflect the gases with much the same result. At the bottom of Fig. 1 I have shown-counterbalance weights 11 at the inner ends of the crank arms 11, for an obvious purpose, and also a set screw 45" for holding the collar 45 on the shoulder 46. These details and others will, however, occur to the builder, and may be adopted without departing from the princi le of my invention.

at the lower end .of said valve chamber and a valve seat at its upper end, a push rod slidably mounted through said guide and resting on said cam, a valve whose head rests on said seat and whose stem depends therefrom, a long nut screwed on the upper end of the push rod, a spider within the upper end of said valve chamber having a central boss, the valve stem passing through said boss and into said nut, a pm through the stem and nut, and an expansive spring coiled around the stem between said nut and spider.

'2. In an internal combustion engine, the a cylinder shell having upright piston and valve chambers communicating nearltheir lower ends, the wall of the piston chamber being provided with, an exhaust and an in.- take; combined with the piston, crank shaft, connecting rod, a cam on said shaft, a guide at the lower end of said valve chamber and a valve seat at its upper end, the wall of the shell between these elements having a side opening, a plate removably closing said opening, a push rod ,slidably mounted through said guide and resting-on said cam, a valve whose head rests on said seat and whose stem depends therefrom, a long nut screwed on the upper end of ,the and having a shoulder, a spider wlthin the upper end of said valve chamber having a central boss with a downwardly facing shoulder, the valve stem passing through said boss and into said nut, means for detachably connecting it with said nut, and an expansive spring coiled around the stem between said shoulders.

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

ALBERT FRED RIEDL.

'Witnesses: l

C. A. GEORGES, FREDERICK L. Gon'rz.

push rod

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