US2191969A - Attachment for internal combustion engines - Google Patents

Description

Feb. 27, 1940. e. H. MEISER ATTACHMENT FOR INTERNAL COMBUSTION ENGINES Filed July 18, 1938 wwzw M Patented Feb. 27, 1940 JATTACHMENT. FOR INTERNAL COMBUSr TION -ENGIN-ES George Meiser, Chicago; 111. Application .July 18,: 1938; Serial No." 219,889

v I Claims. inventioni relates to improvements in attachments for internal combustion engines and, moreparticularly', an air pump adapted for use inzconnection with .a'multi-cylinder internal com- 5 bustion' engine my attachment being primarily adaptedforuse in connection with motor vehicles for'tireinflation, though as will be understood it may be put to other uses.

Devices of this character require for their use n merely the removal of a spark plug from one of the cylinders of the engine and the insertion of the device into. the spark-plug-receiving opening.

The engine isthen operated with the remaining cylinders and the one having the device attached operates in conjunction therewith to pump air,

the air to be pumped being drawn into the device onrthe suction stroke of the engine and then compressed on the compression stroke.

As will be understood, it is essential for pump ingof high pressures that the means controlling vice" on the engine suction stroke and-the shnt ting, offof this air from the atmosphere on the engine compression stroke be as nearly instan pressure as possible; in other words, that'valvelag be minimized to as great a degree as possible.

not only because such lag reduces the efficiency of the pump but because unless practically nonexistent on the suction stroke is apt to result in the pumping of gasoline vapor instead of pure air;

By providing against valve lag on the suction stroke thus permitting instantaneous flow of air to the pumping cylinder, and providing for the free flow of .sufiicient quantities of air through the device, suction produced by'the pumpingcylinder of the engine may be relieved sufliciently to insure againstth'e drawing of gasoline vapor into the cylinder from the intake of the engine in which vacuum exists. v

Furthermore, in the use of the device in the spark-plug-receiving opening of the pumping cylinder the inlet for the air drawn into the pumping cylinder. through the device is limited- .i to the size of this opening which is relatively small, audit is therefore necessary, in order that the pumping cylinder pump high pressures with out pumping gasoline vapor, that the device permit of unrestricted flow of air to the pumping cylinder'and that the air inlet valve of the device act without substantial lag'in both opening and closing. Restricted flow of air into the de vicereduces efliciency by reducing the pressure which may be'developed andr'esults in the creatlo'n of such vacuum in the pumping cylinder,

the-flow of air from the atmosphere into the de taneously reactive to the engine suction and on its suctionstroke; as to draw gasoline vapor; fromthe: intake of the engineinto the pumping cylinder. Valve lag in the: drawing ofairiint'o the device not only reduces the pressurer'whichx may be developed, but also is apt to resultiinithe pumping of' gasoline vapors and. valve lag onv the compression: stroke" of the pumping cylinder: rei- I ducesxthe pressure developed.

Devices of this character for. universal: application mustbe adapted. for: satisfactory operation? 1W on engineswhich operatev not only'at.1ow-,'but. relatively-high, idling speeds. The higheri'th'ei.

idling speed of the engine the rnoreanecessary the avoidance of valve lag and avoidance of restricted? airflow to the air inlet (sparloplug-receiving 113 opening) of. the pumping cylinder for: pumping high pressures Without the pumping of gasoline:

vapors;

Certain of myobjects areto provide a device of the character described which will operate 20 to insure suchfree instantaneousiflow of air: into the pumping cylinder as to avoid. the pumping of gasoline vapor even at relatively high. engine idling speeds; to effect quick shut'eofl of the dcvice' tothe atmosphereuporr the conclusion of" the suction stroke; to'providea deviceby whiclt, high pressures will be produced. at any usual engine-idling speeds without pumping gasoline vapors; andto accomplish these results by. a

novel, simple and inexpensive. construction of device. I v Anotherrequirement' of a device of the char.-

acter stated is that it shall be adapted'for application touse on engines as atpresent comrnonly constructed many ofwhi'ch are of such design as to: present obstruction tothe' application thereto of'such" devices unless provided. of relatively smallsize; it being another of my objects to provideadevice byWhichthe purposesabove men'- tionedimay be accomplished: and: yet Will -be 01544.)?

' such small sizeias'to adapt it tobe used on'engines of. such designs" that devices. of relatively large size. cannot-be used; i

Referring to. the accompanying drawing: Figurelis. a'vi'ew in vertical sectional-elevation 5 of one of fthei cylinders ofv a multi-cylinder inter nal combustion engine showingit as equipped? with a device embodying my invention. a I

'Figurez is'an enlarged view in vertical sec.- tional elevation of the device Of'Fig-Ll.

, Figure 3 is-a' plan'view of the device, the-checks valve-equipped"cap'thereof being removed.

Figured is a plan section'alview taken atith'e line '4' on Fi'giz an'd viewedTin the direction -of the: arrow showing the flapvalves forming apart of:

Figure is a view like Fig. 4 showing the position assumed by the flap valves when air is being expelled from the device.

Figure 6 is a view in side elevation of the flap valves and the cage or retainer therefor showing one of the valves in section; and

Figure 7, a view in side elevation of .the cage, the cage being viewed from the right-hand side of Fig. 6.

The illustrated device comprises a cylindrical casing 8 having its lower end somewhat reduced :in diameter and providedwith external screw threads Q adapted to be screwed into the sparkplug-receiving opening Ill of one of the cylinders of a multi-cylinder internal combustion engine such as the cylinder II of the engine represented at I2.

' The casing 8 contains diametrically opposed series I 3 and I4 of circumferential slots each shown of a length slightly greater than onefourth of the circumference of the casing, these slotsforming air inlets for the purpose hereinafter explained.

The air inlets I3 and M are controlled by check valves in the form of flap valves I5 and I6, these valves being preferably made of a rubberlike material having the necessary qualities to meet the conditions of use in connection with an internal combustion engine, such as is well known in the art; the material known in the art as Neoprene being admirably suited for my purpose.

The valves I5 and IS are held in position by a cage or retainer II comprising an upper plate portion I8 centrally apertured at I9 and depending arcuate inwardly tapering portions 28 and 2| connected with opposite edges of the plate portion I3 and spaced from the side wall of the casing 8, the adjacent upwardly extending edges of the members 20 and 2i being spaced apart as shown to provide diametrically opposed slots 22 and 23 extending lengthwise of the cage throughout the greater portion of its length-in the construction shown, throughout the length of the cage and the length of the series of air inlets l3 and I4. Preferably the members forming the cage are made of sheet metal and may, if desired, be formed of a single sheet thereof stamped or pressed into the desired shape.

,The flap valves are supported at their upper marginal edges on the'cage in registration with the arcuate members 20 and 2|. The means shown for so supporting the flap valves comprise tits 24 struck outwardly from the upper portions of the members 26 and 2I and which extend into openings 25 in the flap valves, whereby the flap valves depend from the cage and the portions thereof opposing the air inlets I 3 and I 4 are movable crosswise of the device into and out of'a position inwhich they close the air inlets.

The cage is so positioned in the casing 8 as to cause its arcuate members 20 and 2I and the flap valves carried thereby to span the series of slots I3 and It in which position of the parts the slots 22 and 23 register with the solid portions of the side wall of the casingtl. The casing is supported in this position by means of substantially diametrically opposed lugs 26 extending laterally from the marginal edge of the plate I8,

these lugs seating onthe lower end walls of short grooves 21 provided on the inner surface of the side wall of the casing 8 and extending lengthwise thereof.

l 23 into the cage and discharging through its open bottom into the casing below the cage.

The upper end of the casing 8 is closed by a cap 28 hereinbefore referred to, screwed intothe casing 8 and having a centrally disposed air outlet 29 controlled by a ball check 30,the upper end of the cap being provided with a nipple 3| adapted for attachment tothe end of a flexible hose shown at 32. This capopposes the plate portion I8 of the cage and prevents upward dis.- placement thereof.

The vparts are so proportionedas shown that when the flap valves I5 and I6 are displaced from the air inlets I3 and I4 as shown in Figs. 2 and 4,

In the use of the device the casing 8 is screwed onto a spark-plug-receiving opening as above described. When the engine is operated-"the piston in the cylinder to which the device is; attached operates to draw air-into the casing 8- through the openings I3 and I4 and expel it ,at

high pressure throughthe opening 29 into the.

hose 32. i

The flap valves I5 and I6 being supported at marginal portions as described are thus free to move at their portions opposing the air inlets I3 and I4 and without any interference between them and any frictional resistance, thus rendering them very sensitive in action. Furthermore, provision is afforded by the construction shown and described for the free, substantially unobstructed flow of the air from the air inlets I3 and I5 into the interior of the lower end of the casing I3 and in such volume as toprevent vacuum produced on the suctionstroke of the piston of the pumping cylinder from becoming sufiiciently effective on the gas intake ofthe engine as to draw gasoline into this cylinder.

In the particular construction shown the cage I I not only serves as a support for-the flap valves but also as a means for limiting inward rnovement of the free edge portions thereof on the suction stroke of the pumping cylinder; serving to permit the flap valves to move inwardly sufiiciently far for efiecting the desired airflow through the device but preventing flapping or fluttering ofthe flap valves as would occur in case no such stops were provided. and which would manifestly be objectionabl l The sensitivity of the flap valvesis effective not only as a factor in developing a high de gree of emciency in. the pumping of air, .per-

Knitting high pressures to be developed, but also as a factorin preventing the pumping of, gasoline. a l

. While I have illustrated'and described a particular construction embodying my. invention! do not wish to be understood as (intending to in other forms of structure" without departing from the spirit of the invention What I claim as new and desire to. secure by.

Letters Patent, is:

as 1 limit it thereto as the same may "be variously modified and altered and the invention embodied:

its side wall, a valve cage in said casing and spaced therefrom, and a flap valve between said casing and cage and secured in place at its upper marginal portion and presenting a free depending portion extending generally lengthwise of the device and cooperating with said air inlet,

said cage having a slut beyond said flap valve and extending generally in the direction of the length of the device and substantially throughout the length of said cage whereby a portion of the air drawn into said casing passes through said slot into said cage for discharge from an end thereof. i o

2. A device of, the character described comprising a casing adapted for communication with the interior of a cylinder of an internal combustion engine, said casing having air inlets in its side wall, a valve cage in said casing and spaced therefrom, and flap valves between said casing and cage and secured in place at their upper marginal portions and presenting free depending portions extending generally lengthwise of the device and cooperating with said air inlets, said cage having a slot located beyond said flap valves and extending generally in the direction of the length of the device and substantially throughout the length of said cage whereby a portion of the air drawn into said casing passes from said slot into said cage for "discharge through an end thereof.

3. A device of the character described comprising a casing adapted for communication with the interior of a cylinder of an internal combustion engine, said casing having air inlets in its side wall, a valve cage in said casing and spaced therefrom, and opposed flap valves between said c'asing and cage and secured in place at their upper marginal portions and presenting free depending portions extending generally lengthwise of the device and cooperating with said air inlets, said cage having slots located adjacent longitudinal edges of said flap valves and beyond said flap valves and extending generally in the direction of the length of the device and substantially throughout the length of said cage, whereby a portion of the air drawn into said casing passes through said slots into said cage for discharge through an end thereof.

4. A device of the character described comprising a casing adapted for communication with the interior of a cylinder of an internal combustion engine, said casing having an air inlet in its side wall, a valve cage in said casing having an upper plate portion by which said cage is supported in said casing, the lower portion of said cage being spaced from the side wall of said casing, and a flap valve in said casing secured in place at its upper marginal portion and presenting a free depending portion extending generally lengthwise of the device and cooperating with said air inlet, said cage having a slot located beyond said flap valve and extending generally in the direction of the length of i the device and substantially throughout the length of said cage, whereby a portion of the air drawn into said casing passes through said slot into said cage for discharge through an end thereof. I

5. A device of the character described comprising a casing adapted for communication with the interior of a cylinder of an internal combustion engine, said casing having air inlets in its side wall, a valve cage in said casing comprising an upper plate portion at which said cage is supported in said casing and plate portions depending from said upper plate portion and spaced from the side wall of said casing, and flap valves between said depending plate portions and said casing and secured in place at their upper marginal portions and presenting free depending portions extending generally lengthwise of the device and cooperating with said air inlets, said plate portions being spaced

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