US2157551A

US2157551A - Air injector for internal combustion engines

Info

Publication number: US2157551A
Application number: US678081A
Authority: US
Inventors: Albert J Loebs
Original assignee: ALBERT G LOEBS JR
Current assignee: ALBERT G LOEBS JR
Priority date: 1933-06-28
Filing date: 1933-06-28
Publication date: 1939-05-09
Anticipated expiration: 1956-05-09

Description

May 9, 1939. A. J. LoEBs AIR INJECTOR FOR INTERNAL COMBUSTION ENGINES Filed June 28, 1953 flJ/LoebJ.

7 3 i a 5 M 4 E 7 3 0 4 y.

z wi a g Patented May 9, 1939 PATENT OFFICE AIR INJECTOR FOR INTERNAL COMBUSTION ENGINES Albert J. Locbs, Brooklyn, N. Y., assignor to Albert G. Loebs, Jr., Forest Hills, N. Y.

Application June 28, 1933, Serial No. 678,081

6 Claims.

This invention relates to an improved air injector for internal combustion engines.

The invention seeks, among other objects, to provide a device of this character which will be mounted between the intake manifold and the carbureter of an engine and which will be automatically operable by the vacuum created in the intake manifold for permitting the flow of air to enter said manifold when the motor is revolving at a high speed so that a maximum efficiency may be had from the motor with the use of a minimum amount of fuel.

Another object of the invention is to provide an air injector which will be operable only at certain speeds so that the motor will be permitted to start and to idle in the normal manner.

A further object of the invention is to provide an air injector which may be installed with the utmost ease upon practically any internal 2o combustion engine.

A further object of the invention is to provide a device of this character which may be adjusted for responsiveness to different speeds.

And a still further object of the invention is to provide an air injector which will be characterized by the utmost simplicity and efficiency.

Other objects of the invention, not set forth in the foregoing, will render themselves apparent asthe description of the invention proceeds.

My invention is illustrated in the accompanying drawing, wherein,

Figure 1 is a horizontal sectional view showing my improved air injector, and

Figure 2 is a fragmentary vertical sectional view'taken on the line 2-2 of Figure 1 and showing the air injector as it would appear mounted in an operative position.

Referring now more particularly to the accompanying drawing wherein like numerals of reference designate like parts throughout the several views, the numeral l indicates the body portion of my improved air injector. The .body portion is formed of cast metal and is adapted to seat between the intake manifold and the carbureter, as shown in Figure 2 of the drawing, the carbureter being indicated by the numeral 2 and the intake manifold being shown at 3. Suitable gaskets 4 are placed on the end faces of the body portion so that danger of leakage about the joints will be prevented. The body portion is provided with a large circular opening 5 centrally thereof which is adapted to permit the passage of vapor into the intake manifold. Formed integrally with the body portion, at one side thereof, is, a cylinder 6 which is substantially octagonal at its outer surface. The cylinder is disposed laterally with respect to the body portion and is provided at each end with internal screw threads 1. Connecting the cylinder, near one end, and the opening 5, is a bore 8. Mounted in the bore 8 and extending substantially radially within the opening 5 is a curved, preferably copper, inlet tube 9.

As best seen in Figure 2 of the drawing, the inlet tube is curved toward the intake manifold. 10 Slidable in the cylinder 6 is a plunger, or piston Hi. The piston is provided with a stem H which is reduced at its mid-portion, as shown at l2, and is externally threaded at its outer end portion. The stem is adapted to project from the 5 cylinder axially thereof and, as shown in Figure 1, the stem is located at the end of the cylinder having the bore 8 therein. The piston is formed with a counterbore l3 and carried in the counterbore is a spring M which is reduced in diameter 20 at one end to define a sleeve [5. Screwed into the cylinder at one end is a cap which is indicated in general by the numeral IS. The cap is provided with air inlet ports I1 and a central boss l8. Screwed through the cap is an adjusting bolt l9 and carried on the bolt is a lock nut 2D. The end of the bolt I9 is reduced and is carried in the sleeve I5 of the spring l4. Closing the cylinder at its opposite end is a cap 2| which is provided with a relatively large air inlet pas- 30 sage 22 extending axially thereof and receiving the reduced portion l2 of the stem freely therethrough. The cap is provided at its inner end with a recess defining a shoulder 23. Carried within the cylinder and extending between the shoulder 23 and the outer circumferential portion of the piston is a controlling spring 24 which normally urges the piston against the cap l6 against the tension of the spring I4 which is of slightly less strength. Carried on the reduced 40 portion 12 is a relatively large closure washer 25 and overlying the closure washer is a securing nut 26. The washer 25 is adapted to overlie the edges defining the passage 22 so that the passa'ge will, under normal conditions, remain 45 closed.

In use, after the device has been installed and the engine is started, said engine will be permitted to idle in its normal manner for the reason that the amount of vapor passing through 50 the intake manifold will not be sufficient to have any effect on the pipe 9 so that no air additional to that supplied by the carbureter itself will enter the cylinder. However, when the throttle is opened, the inrush of vapor into the intake mani- 55 mitted to shift in the cylinder by virtue of the fact that the cap I6 is provided with an opening l'l.

When it is desired to adjust the responsiveness of the piston, the bolt 19 may be shifted for tightening the spring l4 and, at the same time, if desired, the nut 26 may be screwed on the reduced portion I2 so that the piston will be responsive to a less amount of vacuum. For a greater amount of vacuum, it is only necessary to reverse the procedure above outlined. It will be seen that the use of my device will permit the inflow of air into the intake manifold at high speeds so that a greater efiiciency in combustion will be obtained with the result that more,

power will be obtained from a less amount of fuel.

It is emphasized that the device will not interfere with the starting of the engine and, will not affect the running of the motor at idling speed so that the efficiency of the motor will be materially increased at high speeds and will not be diminished in any way at low speeds.

It is believed that a reading of the foregoing description will disclose that I have provided a device of this character which is characterized by the highest efilciency and greatest utilityfand which may be manufactured cheaply on a large scale.

Having thus described my invention, I claim:

1. A device of the class described including a body portion having an openingand adapted for disposal between the carbureter and intake manifold of an internal combustion engine, a cylinder carried by the body portion, a bore leading from said cylinder to said opening, a tube carried by the bore and curved in the direction of flow through the opening, a piston carried in the cylinder and having a stem, caps closing the cylinder at both ends, one of said caps surrounding the stem and being provided with an air inlet passage, a closure Washer carried on the stem, a spring carried on the piston between said latter-mentioned cap and said piston and normally retaining said piston in a position with the closure washer closing the air inlet passage, and a nut carried on the stem and overlying the closure washer for retaining said washer on said stem, the vacuum created by gas passing the tube being adapted for shifting the piston within the cylinder and shifting the washer whereby a flow of air will bepermitted to pass through the air inlet passage into the cylinder.

2. A device of the class described including a body portion adapted for disposal between the carbureter and the intake manifold of an internal combustion engine, said body portion having an opening, a cylinder carried by the body portion, a bore leading from the cylinder to said opening, a pipe carried by the bore and being curved in the direction of flow through the opening, a piston slidable in the cylinder, a stem carried by the piston and having a reduced portion extending axially of the cylinder and projecting therefrom, caps closing the cylinder at both ends,

one of said caps having an air inlet passage, a closure washer carried by the reduced portion of the stem, a spring carried within the cylinder between said piston and said latter-mentioned cap and normally retaining the piston against the cap at the opposite end of the cylinder, and a nut carried on the reduced portion and limiting said closure washer against displacement from the reduced portion,-the vacuum. created by flow of vapor past the pipe being adapted for shifting the cylinder and freeing the closure washer from the air inlet passage whereby a flow of air will be permitted to pass into the opening of said body portion.

3. A device of the class described including a body portion having an opening, a cylinder carried by the body portion, a piston slidable within the cylinder and having a stem and a counterbore, caps closing the cylinder at both ends, one of said caps being provided with an air inlet passage and the other of said caps being provided with inlet ports, a bolt extending through said second-mentioned cap, a spring carried within the counterbore and engageable with the end of the bolt, a closure washer carriedby the stem and adapted for closing the air inlet passage, a controlling spring carried between1 the piston and said first-mentioned cap and adapted for normally retaining the piston against said second-mentioned cap, and a tube carried by the bore and being curved in the direction of flow through the opening of the body portion, the vacuum created by the passage of gas through the opening past the tube serving to shift the piston and the closure washer against the tension of the controlling spring for permitting a flow of air into the body portion, said controlling spring returning the piston and Washer to closed position upon the cessation of flow through the opening.

4. A device of the class described including a body portion adapted to be positioned between the carbureter and the intake manifold of an internal combustion engine, said body portion having a cylinder and an opening, a bore leading from the wall of the cylinder near one end to said opening, a piston carried in the cylinder and having a counterbore and a stem, a spring carried in the counterbore, caps closing the cylinder at both ends, means carried by one of said caps for regulating the tension oflithe) spring, a closure washer carried by the stem and overlying the other of said caps, a nut carried by the stern, a controlling spring carried within the cylinder about the stem and normally urging the piston against said first-mentioned cap, said nut being adapted for regulating the tension of said second-mentioned spring, and 'a tube carried by the bore and extending in the direction of flow through the opening in the body portion, the vacuum in the tube being adapted for drawing the piston against the tension of the controlling spring and freeing the closure washer for permitting a flow of air'into the opening of the body portion.

5. A device of the class described including a body portion adapted to be secured between a carburetor and intake manifold and having an opening to establish communication between the carburetor and manifold, a cylinder carried by said body portion and open at both ends, a piston in the cylinder, caps closing the cylinder at both ends, a bore connecting one end'portion of the cylinder with the opening in the body portion, the cap closing the adjacent end of the cylinder being formed with an air passage, means carried on the piston and engageable with the last mentioned cap for controlling the flow of air through the cylinder and the bore into said opening, a spring yieldably resisting movement of the piston in a direction to open the air passage, and means for regulating movement of the piston including a spring of less strength than the first spring.

6. A device of the class described including a body portion having an opening, a cylinder having an intake passage at one end, a piston slidable in the cylinder and having a stem and means mounted thereon for closing the intake passage, said cylinder having one end portion communicating with the opening of the body, a spring operating against one end of the piston for normally retaining the closure means in closing relation to the intake passage, said piston being shiitable longitudinally in an opening direction for opening said closure means by the vacuum created by gas passing through the opening in the body portion, a spring of less strength than the first mentioned spring engaging said piston and opposing movement of the piston by the first spring, and means for regulating tension of the last mentioned spring.

ALBERT J. LOEBS.