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Патент USA US3037503

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June 5, 1962
|_. D. BURCH
'
3,037,493
INTAKE MANIFOLD
Filed Feb. 5, 1960
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United States Patent 0
3,637,493
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Patented June 5, 1962
2
1
to convey the exhaust gases through a suitable mu?ier
3,037,493
INTAKE MANIFOLD
Lewis D. Burch, Birmingham, Mich., assignor to General
Motors Corporation, Detroit, Mich., a corporation of 91
Delaware
Filed Feb. 5, 1960, Ser. No. 6,951
3 Claims. (Cl. 123—52)
and exhaust pipe to the atmosphere.
The intake manifold, illustrated generally by the nu
meral 24, is shown to be disposed lengthwise of the en- ,
gine _10 and generally centrally thereof. The manifold
24 has a central portion 26 and a plurality of groups of
ram pipes 28, extending at generally right angles there
from and toward the engine block 16 adjacent the end
cylinders in each of the rows 12. The manifold is secured
This invention relates to intake manifolds for internal
combustion engines and more particularly to an intake 10 to the engine by ?anges 30, located on the ends of the
groups of ram pipes 28, which are bolted or otherwise
manifold providing equal distribution of the air-fuel
secured, as by bolts 32.
The longitudinal walls 34, along with the top and bot
tom, of the manifold 24 provide a plenum chamber 36
ing device to the engine cylinders for combustion therein. 15 which receives the air-fuel charge from the carbureting
device located above the manifold. The plenum chamber
The carburetor device may take the form of a carburetor
charge ‘to each of the engine cylinders.
In internal combustion engines, an intake manifold is
necessary to convey the air-fuel mixture from a carburet
having primary and secondary outlet passages leading
36 connects with passages 38 in the ram pipes which in
directly to the intake manifold, the primary passages con
turn lead to outlet ports 40, the outlet ports being aligned
with similarly shaped ports in the engine 10‘ for conveying
veying the air-fuel mixture during periods of low engine
speed and the secondary passages being arranged to sup 20 the charge to the cylinders.
At the junction between the plenum chamber 36 and
ply air-fuel mixture, along with the primary passages,
the ram pipe passages 38, charge distribution Zones 42
during periods of high engine speed. This may be ac
‘are provided from which the charge is passed through the
complished by means of a carburetor having an even or
an odd number of barrels or passages, that is, a four
barrel or three—harrel carburetor device.
’
In most intake manifolds, the intake ports communicat
ing with the carburetor device are arranged in such a
manner that the primary intake ports are disposed at one
side or the other of the main manifold portion so that the
25
ram pipe passages 38 to the engine cylinders.
The upper surface of the central portion 26 is formed
to provide a pad 44 to receive a carburetor device, which
may be bolted or otherwise secured thereto, the threaded
openings 46 being provided for this purpose. The car
buretor pad 44 has a plurality of apertures, or ports,
charge distributed by the intake manifold is unequal 30 formed therethrough, primary apertures ‘48 communicat
ing with the primary outlets of the carburetor device and
to some of the cylinders as compared to others. This
secondary apertures 50 communicating with the secondary
leads to inef?cient engine operation and poor fuel
economy;
'
'
The device in which this invention is embodied com
outlets of the carburetor device.
It is to be noted that primary apertures 48‘ are posi
prises, generally, an intake manifold having a central 35 tioned centrally of the central portion 26, and centrally
of the plenum chamber 36, in a lateral direction with re
plenum chamber extending lengthwise of the engine and
spect to the engine 10. Further, the secondary inlet ports
having a plurality of ram pipes connected thereto for
or apertures 50 are located on the longitudinal centerline
conveying the air-fuel charge to the engine cylinders.
of the central portion 26 and are spaced on opposite sides
A carburetor mounting pad is located centrally of the
plenum chamber and has intake ports formed therein and 40 of the primary inlet ports 48. With such location of the
primary and secondary inlet ports, it is seen that the
communicating with the carburetor. The intake ports
charge distribution through the plenum chamber 36 and
are so ‘arranged as to place the primary and secondary
to the distribution zones 42‘ will be equal in both direc
intake ports equidistant from all of the ram pipes.
tions, Whether the primary inlets alone are receiving the
With a construction of this nature, the charge distribu
tion to the engine cylinders will be equal under all con 45 charge from the carburetor or whether both the primary
and the secondary inlet ports receive the charge. Since
the charge is uniformly distributed to the zones 42, the
passage of the charge through the passages 38 in the ram
economy thereof.
pipes '28 and through the outlet ports 40, will be equal,
These and other advantages will become more ‘appar
ent from the following description and drawings in which: 50 and the charge passing to each of the cylinders will be
equal.
FIGURE 1 is a plan view of a V-type engine, with
Referring to FIGURE 2, a modi?cation of the intake
parts broken away and in section, to illustrate the position
manifold is shown on a similar V-type internal combus
and construction of the intake manifold embodying this
tion engine 10 having rows of cylinders 12 and other
invention.
FIGURE 2 is a plan view of a V-type engine, with parts 55 parts similar to those illustrated in FIGURE 1 ‘and bear
ing like reference numerals.
broken away and in section, illustrating a modi?cation
The intake manifold, illustrated generally by the nu
of the intake manifold illustrated in FIGURE 1 ‘and suit
ditions of operation of the engine, making the engine more
efficient in its operation and greatly increasing the fuel
meral 60 in FIGURE 2, is shown to have ‘a central por
tion 62 in which is de?ned a plenum chamber 64 and from
Referring more particularly to the drawings, 'a modi?ca
tion of the intake manifold is illustrated in FIGURE 1. 60 which extends the groups of ram pipes ‘66. The ram pipes
able for use with a three-barrel carburetor.
are secured to the engine 10 by the ?anges 68, the ?anges
being held in place by bolts 70 or some other suitable
by the numeral 10, is provided with two rows of cylinders
attaching means. The ram pipes 66 have passages 71
12 on opposite sides of the longitudinal centerline thereof.
formed therein to convey the air-fuel mixture to the outlet
Cylinder heads 14 are secured to the engine block '16 in
ports 72 ‘and thus to the engine cylinders.
some suitable manner, and contain the valves and spark 65
A carburetor mounting pad 74 is provided centrally of
plugs which make the engine operative. Cover members
the central portion ‘62 to receive a carbureting device
18 enclose the valve rocker arms and other operating
which may be secured to the pad 74 by bolts or the like,
mechanism to prevent dirt, water and other foreign ma
the threaded openings 76 being provided for this purpose.
terials from coming in contact therewith, the covers 18
A plurality of openings or ports are formed through the
70
being secured to the heads 14 in some suitable manner,
central portion 62 of the manifold 60/, corresponding to
as by bolts 20. Exhaust manifolds 22 are also provided
the primary and secondary outlets of the carburetor de
A V-type internal combustion engine, illustrated generally
3,037,493
O
4
vice. In this instance the central opening 78 corresponds
to the primary outlets of the carburetor, and the outside
apertures 80, spaced on opposite sides of the primary
port 78, correspond to the secondary outlets of the car
pipes connected in side-by side relation at opposite ends
of said plenum chamber and extending toward the cylin
buretor device. All three of the openings 78 and 80
are aligned on the longitudinal centerline of the intake
manifold 60 such that the air-fuel charge to the charge
distribution zones 82' will be equal, whether the primary
opening 78 is receiving all the charge from the carburetor,
ders at the ends of said rows, said plenum chamber at the
inlet ends of said ram pipes being formed to provide
?uid distribution zones, and inlet means in said manifold
and connected to said plenum chamber and including a
pair of primary ports and a pair of secondary ports, said
primary ports being arranged laterally of said manifold
and centrally of said plenum chamber, said secondary
or whether the secondary openings 86* are receiving some 10 ports being aligned longitudinally of said manifold and
of the air-fuel mixture as well. Since the passage of the
mixture to the distribution zones 32 at opposite ends of
on opposite sides of said primary ports, said primary and
the plenum chamber 74 is equal, the passage of the charge
to the pipes 70 and the ram pipes, and to the cylinders
through the outlets 72, will be equal during all conditions
of operation of the engine.
of fuel to said zones and to said ram pipes during all con
Thus, an intake manifold is provided for a V-type in~
ternal combustion engine which permits an equal distribu
tion of the air-fuel charge to each of the engine cylinders
for proper operation of the engine.
What is claimed:
secondary ports providing equal and uniform distribution
ditions of operation of said engine.
3. An intake manifold for an internal combustion
engine having parallel rows of cylinders on opposite sides
of said engine, said manifold being formed to provide
an elongated plenum chamber adapted to be disposed
lengthwise between said rows of cylinders and groups
of ram pipes connected in side-by-side relation at op
posite ends of said plenum chamber and extending toward
the cylinders at the ends of said rows, said plenum cham
1. An intake manifold for an internal combustion
ber at the inlet ends of said ram pipes being formed to
engine having parallel rows of cylinders on opposite sdies
provide ?uid distribution zones, and inlet means in said
of said engine, said manifold being formed to provide
an elongated plenum chamber adapted to be disposed 25 manifold and connected to said plenum chamber and in
cluding a primary port and a pair of secondary ports,
lengthwise between said rows of cylinders and groups of
said primary port being disposed midway between the ends
substantially identical ram pipes connected in side-by-side
of said plenum chamber, said secondary ports being
relation at opposite ends of said plenum chamber and ex
aligned with said primary port longitudinally of said
tending toward the cylinders at the ends of said rows,
manifold and on opposite sides thereof, said primary and
said plenum chamber at the inlet ends of said ram pipes
secondary ports providing equal and uniform distribution
being formed to provide ?uid distribution zones, and
primary and secondary inlet means for said manifold and
of fuel to said zones and to said ram pipes during all con
ditions of operation of said engine.
connected to said plenum chamber between said zones,
said secondary inlet means being spaced on opposite sides
of said primary inlet means lengthwise of said plenum 35
References Cited in the ?le of this patent
chamber to provide equal distribution of fuel to said zones
UNITED STATES PATENTS
and to said ram pipes during all conditions of operation
2,098,424
Kolimbat ____________ _.. Nov. 9, 1937
of said engine.
2. An intake manifold for an internal combustion
2,733,695
engine having parallel rows of cylinders on opposite sides 40 2,845,911
2,886,021
of said engine, said manifold being formed to provide an
elongated plenum chamber adapted to be disposed length
wise between said rows of cylinders and groups of rain
2,927,564
Goodridge ____________ __ Feb. 7,
Gill ________________ __ Aug. 5,
Burrell ______________ __ May 12,
Turlay et al. _________ _.. Mar. 8,
1956
1958
1959
1960
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