US2295832A - Manifold - Google Patents

Description

sept- 15, 1942- G. A. cHEDlsTER A2,295,832 M MANIFOLD Filed April 6, 1940 2 Sheets-Sheet 1 INVENTOR.

GUY ,4. CHED/STER I ATTORNEY.

Sept 15, 1942- G. ,A. CHEDISTER 2,295,832

MANIFOLD Filed April 6, 1940 sheets-sheet 2 INVENTOR GUY A. C/7'fD/` T'R BYv Z A j z ATTORNEY.

Patented Sept. 15, 1942 UNITED STATES PATENT OFFICE (Cl. 12B-52) 8 Claims.

This invention relates to manifolds and has particular reference to means for connecting a carburetor to the intake manifold of an internal combustion engine.

It is an object of this invention to provide means for connecting a carburetor having two transversely positioned ports to a manifold extending longitudinally of the engine.

It is another object of this invention to provide means for adapting a carburetor designed to be located at one angle relative to an automobile to a motor having a manifold extending at an angle of 90" from the line in which the carburetor is designed to be located.

It is another object of this invention to provide novel means for connecting a carburetor having dual ports to an engine having a single manifold.

Other objects and advantages of this invention will be apparent from a consideration of the following description and attached drawings of which there are two sheets and in which Figure l respresents a vertical transverse section of an internal combustion engine with my invention installed thereon;

Figure 2 represents va side elevation of that portion of the engine embodying my invention;

Figure 3 represents a plan View of that portion of the engine illustrated in Figure 2;

Figure 4 r'epre'sents a section taken along the line 4 4 of Figure 3 and looking in the direction of the arrows; l Figure 5 represents a section taken along the line 5 5 of Figure 3 and looking in the direction of the arrows;

Figure 6 represents an end elevation of a modified type of my invention;

Figure 7 illustrates a side elevation 0f a portion of the structure illustrated in Figure 6;

Figure 8 is a bottom view of the structure shown in Figure 7; and,

Figure 9 represents a section taken along the line 9--9 of Figure 8 and looking in the direction of the arrows.

Some internal combustion engines, particularly eight cylinder engines, are built with two generally parallel manifolds. One manifold leads to the last two cylinders at each end of the engine and the other manifold leads to the four center cylinders. To accommodate these manifolds, carburetors are designed with transversely disposed dual discharge ports which lead one to each manifold. Since the manifolds and engine usually extend longitudinally of the automobile in which they are installed, the carburetors are provided with float chambers on the front or back rather than the sides to equalize the effect of centrifugal force on the fuel in the float chamber as the automobile is driven around corners. The controls are also located so as to be most easily operated while the carburetor is positioned with its ports transverse to the axis of the automobile.

'I'he same carburetors as just described may be used on engines having single manifolds, such as six cylinder engines, by making minor changes in the jet sizes and adjustment. However, if the carburetor is turned so that its ports will be disposed longitudinally over the manifold, the float tank and controls will be 90 out of the most desirable position. A

It is desirable for automobile manufacturers producing diiferent cars, such as sixes and eights, to have as many parts as possible interchangeable between the several types as this cuts down the inventory of parts that must be supplied and stocked. I have developed a simple part which will make the same carburetor interchangeable on motors having single or double intake manifolds. lIt is also useful in mounting a carburetor on an engine that is mounted transversely of the automobile as is sometimes done in buses. By using this part, a manufacturer may avoid going to the expense of designing and stocking an entirely new carburetor.

In Figure 1 I have illustrated an internal cornbustion engine 2B having a head generally indicated at 22 and a carburetor 24. The head 22 is designed for a valveein-head engine and is provided with the exhaust port 26, connecting combustion chamber 28 with the exhaust pipe 39, and with valve guides 32 through which valves (not shown) pass to control the opening and closing of the port 2S. The head 22 is also provided with cooling water passages 34 and an intake manifold 36 which extends longitudinally of the head and from which the intake ports 38 (see Figure 1) extend downwardly to each of the combustion chambers 28. The motor is provided with a rocker arm cover 39 and a tappet rod passage 4) which provides communication between the engine 2!! and the rocker arms.

The carburetor 2li is provided with two ports communicating with the passages 42 and 44 shown in Figures 3 to 5 which will be more particularly described later and spaced transversely of the engine at their top portion. The carburetor is also provided with controls 46 and a 4float chamber on the forward side of the carburetor (not shown). The carburetor is posiltioned as just explained because that is the position for which it was designed to operate most efficiently as described above I have provided a cover plate 48 for closing the intake manifold 36, which cover plate is secured to the head'22 by means of bolts (not shown) passed through holes 49 in the bosses 50 formed on the top of the cover plate 48. The cover plate is further provided with a thickened or raised portion 52 having an upper iiange 54. The upper iiange 54 is apertured as at 56 so that the carburetor 24 may be bolted to the upper flange. The thickened portion 52 has formed within it the two passages 42 and 44 mentioned above. It will be noted that the passage 42 curves from a position above and toward the outer side of the-carburetor 36 downwardly and into a position directly over the manifold 36. This passage is indicated in Figures 1 through 3 by dot and dash lines. The other passage 44 starts at a position almost directly over the manifold 36 and curves downwardly and for- `wardlyto the manifold-36. This passage is illustrated in Figures f1- throughY 3fby the heavy dotted lines.

As is illustrated in Figures 4 and 5, passages V44-and 42 Ahave Yapproximately the same length and shape. -'Ihisinsures that if the carburetor discharges two like streams of fuel and airmixture-into the passages 42 and'44, the two streams will'still bealike when-discharged into the manifold. Thefpassage-42 is curved yfrom themanifold-fppwardly and-outbeyond the side of the manifolddue-to the fact that the caburetor24 mustfbe setlto vthe side of Ythe-head 22 in order tofclear tthe rocker arm cover 38.

In Figure 6 I have illustrated a portion of an -L-head 'type motor' 66 yhaving head 62 secured thereon-inthe-normal-fashion. The motor block 60'is -provided with an intake manifold 64 extending x'longitudinally of the motor block and from 'which-the intake ports 66 extend to each of =the cylinders lin the block. The vhead 62 is provided lwith Aftwo vertical passages 63 which disohargeintothe-manifold 64. The carburetor 104s much the same as the'carburetor illustrated in Figure land is provided with two downwardly discharging ports.

morder to linstallthis carburetor 16 on the headEB-so that the-ports of the-carburetor may be positioned laterally with respect'to the engine, I-have provided-the spacer block 1-2 which has a lower fiange I4 apertured at 1:6 sothat itfcan be bolted to'the head kv62 and-also provided with an upper flange A16 apertured as at 86 so that it maybe bolted to thefcarburetor 10. IIhe upper fiange -18 of the spacer vblock -12 is-provided with two transversely spaced openings 62 and 84 which are arranged to Y`register `withthe ports and the undersideof-the carburetor I6. The outer port 82=communicates witha spiral passage 86 which vcurvesdownwardly and tothe rear'to a lower port -88 -'in Ithe -lower flange `'I4 of lthe spacer block I2. `'Ihe-innerport .84 curves downwardly in avspiral'passagelf `to the .forward port 92 `indie-lower flange J4. These passages 86 and .96 dischargefinto-the.intake manifold 64 and are approximately equal in length and curvature so as to retain themixture balance between the twofstreams of fuel land air :passing through the two passages.

It r`willbe noted that sinoe'the engine shown inFigure 6 is an L-head engine, the carburetor 10 mayfbepositioned-directly over the intake manifold'64 so that the-ports `82 and 84 in the upperflange ofthe spacer 12 are located approximately-over the vintake manifold 64. I have found that the addition of the spiral passages into the path of the fuel mixture, both in the L-head and valve-in-head engines, does not detract from the eiciency of the manifold systems as a whole and may even better the manifolds characteristics due to the swirling motion imparted to the mixture by the spiral passages.

While I have described my invention in some detail, I intend this description to be an example only and not limiting upon my invention to which I make the following claims.

I claim:

vl. In combination with an engine having a manifold along the top thereof, a carburetor for said engine defining two ports positioned in a line transverse to said manifold, and a cover for said manifold defining two passages opening in two transversely positioned ports in the top of said cover and in two longitudinally positioned ports over said manifold, said carburetor being secured to said cover 'over said vtop ports.

2. In combination with an engine having'a manifold formed in its top surface and positioned longitudinally of said engine, a carburetor for said engine defining two ports positioned in a line transversely of said engine, a cover for said manifold and a thickened portion formed on said cover, said thickened portion defining a pair of passages lopening intransversely located ports at the top of said thickened portion and opening in longitudinally positioned ports over said manifold.

3. In combination .with a valve-in-head engine, a head for said engine having valve mechanism along one side ofthe top thereof, a manifold formed along the other'side of the top thereof, a cover for said manifold, said cover defining two ports positioned longitudinally of said manifold, ducts formed in said cover and connecting with said ports, one of said ducts curving upwardly from one of said ports to a point over the other port, the other duct curving upwardly and .+o the side to a point adjacent the end of said first duct, and a carburetor'having two ports connecting with the upper ends of said ducts.

4. In combination with a valve-in-head engine, a head for said engine having valve mechanism along one side of the'top thereof, a manifold formed along the other side of the top of said head, a cover for said manifold, said cover defining two ports positioned longitudinally of said manifold, ducts formed in said cover, one of said ducts curving upwardly from one of said ports and extending longitudinally of said cover, the other of saidducts curving upwardly from the other of said ports and transversely away from said valve mechanism, and a carburetor having two ports registering with the upper ends of said ducts.

5. In combination with an engine having a manifold along one side thereof, a cover for said manifold defining two ports longitudinally of said manifold, a pair of ducts formed'in said cover and connecting with said ports, one of said ducts curving upwardly and over the other duct andthe other duct curving upwardly from beneath said first duct to a point adjacent the upper end of said first duct.

6. In combination with an L-head engine having a manifold in the top thereof, a head for said engine and covering said manifold, said cover defining two ports longitudinally of said manifold, a spacer member positioned on said head and defining a pair of ducts connected one to each of said ports, said ducts curving upwardly in a quarter spiral turn about each other, and a carburetor having two ports cooperating With said ducts secured to said cover.

7. In combination with an engine having a manifold formed in its upper surface and positioned longitudinally of said engine, a cover for said manifold defining inlet ports to said manifold, a spacer member secured to said cover over said inlet ports, said spacer defining a pair of ducts opening in transversely located ports at the top of said spacer member, and longitudinally located ports at the bottom of said spacer member.

8. In combination with an engine having a manifold, a carburetor having two ports, a closure for said manifold defining a second pair of ports, and means for supporting said carburetor over said manifold with said pairs of ports positioned along askew lines, said supporting means dening a pair of spirally arranged passages con- 10 necting said pair of ports.

GUY A. CHEDISTER.

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