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Патент USA US2122348

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June 28, 1938.
2,122,348
A.‘ G. MAHRSTRGM .
CARBURETOR
Filed Feb. 23, 1937
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June 28, 1938.
A. G. MAHRSTROM
.
2,122,348
CARBURETOR
Filed Febfzs, 1957
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Patented June 28, 1938
2,122,348
UNITED STATES PATENT OFFICE
2,122,348
I
GARBURETOR
Anton Georg Mahrstriim, Gothenburg, Sweden
Application February 23, 1937, Serial No. 127,254
In Sweden June 11, 1934
3 Claims.
This invention relates to carburetors for in
ternal combustion engines.
The: object of the invention is to provide an
e?icient and economical carburetor working per
fectly under all conditions.
In the drawings:—
Figure 1 is a side View of certain parts of the
improved carburetor;
‘
Figures 2 and 3 are vertical sections through
10 the carburetor along planes perpendicular to each
other and showing the air and fuel regulating
members in, closed position;
Figure 4 isv a section corresponding to Figure
3 of certain parts of the carburetor showing the
15 air and fuel regulating members in slightly open
position, and
Figure 5 a similar View showing the air and
fuel regulating members in a more open position.
The present embodiment of my invention com
20 prises an outer casing I having an axial passage
(Cl. 261-45)
in the drawings) so sized, that fuel flowing from
the nozzle II through the tube I5 to the cham
ber I‘! will in such a degree be mixed up with air
entering through said air supply openings that a
rich mixture of fuel and air will be produced.
5
The carburetor casing I is interiorly formed at
its one end (near the ?oat chamber) with a cy
lindrical portion I8 and, at its opposite end, with
another cylindrical portion I9 of a smaller diam
eter. Between said cylindrical portions the cas- 10
ing I is inte-riorly formed with a conical portion
2!). Within the carburetor casing I there is slid
ably mounted a sleeve 2| provided at its one end
with a wider cylindrical portion 22 ?tting in the
wide cylindrical portion I8 of the casing I and, 15
at its opposite end, with a cylindrical portion
23 of an outer diameter substantially equal to the
inner diameter of the narrow cylindrical portion
I9 of the casing I. At its upper end the sleeve
2| has a bottom 25 with openings or slots 24 20
way 2. At its one (upper) end the casing l is: passing therethrough, which bottom carries a
provided with a ?ange 3 for the connection of guide ring 26 slidable within the cylindrical por
the casing to the suction pipe of an internal com
tion IQ of the casing I. The wide portion 22 of
bustion engine, and at its opposite (lower) end the sleeve 2| is near its open free end interiorly
25 the casing I is in a known manner provided with so shaped that on a certain distance, counted in
a ?oat chamber 4. This chamber is provided with the direction of movement of the sleeve, its diam
a fuel (petrol) inlet 5 and a. float 6 for the regu
eter will successively diminish in the direction
lation of the fuel level. At the end of the car
against the said end, so that the annular open
buretor casing I adjacent the ?oat chamber the ing or slot 28 (see Figure 4) formed between the
30. casing‘ has a bottom ‘I which at a distance from edge of the head I3 and the inner side of the
its edge is provided with a socket-shaped por
sleeve will successively increase when the sleeve
tion 8 projecting into the casing l and perforated is moved in the direction toward the bottom ‘I.
by a number of openings 9. Through a central In a similar way the socket-shaped portion 8 pro
opening in the bottom ‘I a tube-shaped member jecting from the bottom ‘I is near the bottom ‘I
35 10 passes projecting down in the ?oat chamber
(at 30) so formed that it grows wider in the di4 and provided at its lower end with a spray rection toward the bottom 1, so that the annular
nozzle II for the petrol. The upper portion l2 slot or opening 30a formed between the sleeve 2|
of the member Iii projects centrally into the and the socket-shaped portion 8 will diminish,
casing I and is at its inner end formed with an when the sleeve 2| is moved in the direction to
40 enlarged head I3, between which and the upper ward the bottom ‘I.
edge of the socket-shaped portion 8 of the bottom
The carburetor casing l is provided with a series
‘I an annular slot or opening I 4 is formed. Within vof air inlet openings 3| distributed around the
the lower portion of the tube-shaped member In casing and admitting the outer air to the annular
there is centrally inserted a tube l5 with an outer space 32 between the middle portion of the casing
45, diameter slightly less than the inner diameter of
I and the sleeve 2|. To a chamber 33 between
said lower portion of the tube-shaped member It. the casing I and the socket-shaped portion 8 an
At the upper end of the tube l5 side openings air inlet opening 34 passes, and in an air inlet
l6 are provided passing to the annular chamber tube 35 communicating with said opening there
I1 formed between the upper portion of the tube
is provided an air regulating valve 36.
50 shaped member I!) and the socket-shaped portion
To the sleeve 2| there is ?xed a pin 31 (see Fig8 of the bottom ‘I. To the space between the tube
ures 1 and 2) the one end of which projects
shaped member It) and thetube I5 there is con
through a longitudinal slot 38 in the carburetor
nected an air supply channel I511 (see Figure 2). casing I. Near said slot a pin 39 is ?xed to the
This tube I5 is in a known manner perforated casing, and on said pin there is mounted a two
55 by a number‘ of air supply openings (not shown armed lever 40 the one fork-shaped arm M of
25
30
35
40
45
50
55
2
2,122,348
which embraces the projecting end of the pin 31,
so that by swinging the lever 40 by means of the
tributes to effect an intimate mixture between the
other arm 42 in the one direction or the other
the sleeve 2| will be moved in the one direction
The outer enlargement 5|] of the socket-shaped
or the other within the casing |.
The device described works in the following
manner:—
In the position shown in Figures 2 and 3, in
which the sleeve 2| is most remote from the bot
10 tom 1, the narrow portion 23 of the sleeve 2| en
tirely or almost entirely closes the narrow, cylin
drical portion IQ of the carburetor casing I, so
that supplementary air from the air inlet open
ings 3|, is prevented from ?owing to the suction
15 pipe of the engine. In this position of the sleeve
2| the edge or circumference of the head I3 con
, tacts the inner side of the portion 22 of the sleeve
2|, so that the vacuum in the suction pipe of the
engine, which vacuum is transmitted to the in
terior of the sleeve 2| through the openings 24,
can not be transmitted to'the annular chambers
l1 and 33. In this position of the sleeve 2| (run
ning light position) fuel is admitted to the inte
rior of the sleeve through‘a channel v4i! (see Fig
ure 2) passing to the upper side of the head |3
from a channel 44 communicating with the space
between the tube I5 and the tube-shaped mem
ber Hi.
When moving the sleeve 2| in the direction to--‘
ward the bottom 1 there arises between the upper
20
’
25
30
edge of the upper, cylindrical portion 23 of the
sleeve 2| and the inner side of the carburetor cas
mg | an annular opening or slot 45 (see Figure
4) which increases to a certain limit as said
movement proceeds and through which supple
mentary air from the air inlet openings 3| is ad
mitted to ?ow to the suction pipe of the engine.
Simultaneously as at said movement of the sleeve
2| said opening ‘or slot 45 is formed, an annular
opening or slot 28 arises between the head I 3 and
the inner side of the wide cylindrical portion 22
of the sleeve, which opening or slot in a similar
manner increases as the movement of the sleeve
proceeds.
Through said opening or slot 218 the
45 vacuum in the interior of the sleeve 2| is trans
mitted to the chamber I1 inside the socket
air and the fuel.
'
portion 8 near the bottom ‘I has for its object to
reduce the opening or slot 30a (see Figure 5) when
the sleeve 2| is further moved in the direction to
ward the bottom 1. By this the air admission
through said opening will diminish and the vac
uum in the chamber I‘! will increase with the
effect that the fuel admission will increase thus 10
effecting a more rich mixture of fuel and air
flowing to the suction pipe of the engine. To this
position the sleeve 2| is brought on such occa
sions when it is desired to increase the efficiency
of the engine without respect to the economy.
15
The air inlet valve 36 normally occupies its
open position. When starting‘ the engine the
valve may occasionally be shut in order to effect
a more rich mixture of fuel and air.
Having now particularly described and ascer
20
tained the nature of my said invention and in
what manner the same is to be performed, I de
clare that what I claim is:—
1. An improved carburetor for liquid fuel com
prising a casing provided at its one end with a 25
bottom and at its other end with an outlet ‘for
the mixture of air and fuel, a slidable hollow
sleeve within said casing adapted to regulate
air openings in the walls of the casing and pro
vided with an axial passage, means for moving 30
said sleeve within said casing, a nozzle outside
the casing for atomizing the fuel and producing
a rich mixture of fuel and air, a channel for con
ducting said rich mixture through said bottom
to an annular chamber formed between a mem
ber projecting centrally from the bottom into
the casing and a socket-shaped member encir
cling said central member, an enlarged head at
the inner end of said central member, an annu
lar passage-way between said head and the inner 4:0
edge of said socket-shaped member, another an
nular chamber between the casing and said sock
et-shaped member, an air inlet passing to the
last-mentioned chamber, and an interiorly coni
cal portion of said sleeve encircling said head, 45
between the circumference of which and said
conical portion there is formed an annular pas-'
sage-way the size of which varies with the posi
tion of the sleeve, and which passage-way forms
communication between said annular chambers 50
shaped portion 8 and from there through the
openings l6 and the tube l5 to the nozzle | |. The
rich .mixture of air and petrol now‘ produced in
50 the tube l5 ?ows through the openings I6'to the
the interior of the sleeve. .
‘
chamber H, where it meets and gets mixed with and
2. An'improved carburetor for liquid fuel com
supplementary air entering through the open
prising a casing provided at its one end with a
ings 9, further through the opening or‘ slot I4, bottom and at its other end with an outlet for the
where the mixture meets and gets mixed'with mixture of air and fueLVa slidable hollow sleeve 55
55 further supplementary air coming from the slot
within said casing adapted to regulate air open
30a, and ?nally through the slot or opening 28 to ings in the walls of the casing and provided with
the interior of the sleeve 2|, from where the mix
an axial passage, means for moving said sleeve
ture escapes through the openings 24 and to ' within said casing, a nozzle outside the casing
gether with supplementary air ‘entering through for atomizing the fuel and producing a rich mix 60
the slot or opening 45 flows to the suction pipe of ture of ‘fuel and air, a channel for conducting said
the engine.
I
‘ It is evident that by adapting the shape of the
sleeve portion 22 in a'suitable manner in rela
tion to the shape of the portion 20 of the car
65
buretor casing |, the mutual relation between
the size of the opening or slot 45, which deter
mines the admission of air, and the size of the
opening or slot 28, which determines the admis
" sion of fuel, may be ‘so chosen that for each po
sition of the sleeve 2| the most economical relation between fuel and air' isv obtained. The
manner in which supplementary air is at differ
_ ent points incorporated with the mixture of fuel
75]
and air flowing through the carburetor con
rich mixture through said bottom to an annular
chamber formed between a member projecting
centrally from the bottom into the casing and a
socket-shaped member encircling said central 65
member, an enlarged head at the inner end of
said central member, an annular passage-way
between said head and the inner edge of said
socket-shaped member, another annular chamber
between the casing and said socket-shaped mem 70
ber, an air inlet passing to the last-mentioned
chamber, means in said inlet for regulating the
admission of air, and an interiorly conical por
tion of said sleeve encircling said head, between
the circumference of which and said conical por
3
2,122,348
tion there is formed an annular passage-way the
size of which varies with the position of the sleeve,
and which passage-way forms communication be
tween said annular chambers and the interior of
the sleeve.
3. An improved carburetor for liquid fuel com
prising a casing provided at its one end with a
bottom and at its other end with an outlet for
the mixture of air and fuel, a slidable hollow
10 sleeve within said casing adapted to regulate air
openings in the walls of the casing and provided
with an axial passage, means for moving said
sleeve in said casing, a nozzle outside the casing
for atomizing the fuel and producing a rich mix
15 ture of fuel and air, a channel for conducting said
rich mixture through said bottom to an annular
chamber formed between a member projecting
centrally from the bottom into the casing and a
socket-shaped member encircling said central
member, an enlarged head at the inner end of
said central member, an annular passage-Way be
tween said head and the inner edge of said socket
shaped member, another annular chamber be
tween the casing and said socket-shaped member,
an air inlet passing to the last mentioned cham
ber, an interiorly conical portion of said sleeve en
circling said head, between the circumference of
which and said conical portion there is formed an 10
annular passage-way the size of which varies with
the position of the sleeve, and which passage-Way
forms communication between said annular
chambers and the interior of the sleeve, and chan
nels passing through said socket-shaped member 15
between said annular chambers.
ANTON GEORG MAHRsTRoM.
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