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Патент USA US3042023

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July 3, 1962
E. 1.. NELSON
3,042,013
FUEL SUPPLY MEANS FOR ENGINES
Filed Sept. 12, 1960
IN VEN TOR.
EU6E'NE 4. N51. 50»!
BY
A Tree/v5 Y5
States ‘atent Of?ce
1
3,042,013
Patented July 3, 1962
2
Another object of this invention is to provide a fuel
3,042,013
supply
or induction device incorporating a maximum num
FUEL SUPPLY MEANS FOR ENGINES
ber of reed valves which are compactly nested. and which
Eugene L. Nelson, Cedarburg, Wis., assignor to Tecum
seh Products Co., Tecumseh, Mich., a corporation of 5 provide an extensive fuel supply to the crankcase.
Michigan
'
A further object of the invention is to provide a reed
valve assemblage for use in controlling the supply of
Filed Sept. 12, 1960, Ser. No. 55,334
4 Claims. (Cl. 123-73)
fuel mixture to the crankcase of an internal combustion
engine in which the reed valves are most e?iciently located
The present invention relates generally to improve
so as to direct the ‘mixture with maximum e?iciency to
ments in crankcase induction of fuel for internal com 10 the crankcase chamber at one end of the piston.
bustion engines, and relates more particularly to improve
An additional object of the invention is to provide a
ments in fuel supply valves for controlling the delivery of
crankcase fuel injection device for internal combustion
fuel mixture to the crankcase of engines of the fractional
engines in which the possibility of valve breakage is min
horsepower type.
imized by limiting the swinging motion of the individual
A primary object of the invention is to provide improved 15 reed valves in predetermined directions.
valve means for the introduction of fuel to the crankcases
Still another object of my present invention is to pro
vide an improved reed type valve device for supplying
the engine will operate at high speed and at maximum
fuel and air mixture to the crankcase of a two cycle engine
volumetric efficiency.
,
‘which can be readily applied to or removed from the crank
Various types of inspiration or induction devices for 20 case for inspection without need for removing the closure
admitting successive charges of fuel mixture‘ to one or
head for the crank chamber, the reed valve assemblage
more cylinders of fractional horsepower type internal
being located in close proximity to the outside of the
combustion engines through the crankcase or crankcases
crank chamber.
have heretofore ‘been proposed and used extensively. In
An additional object of the present invention is to pro
some of these prior fuel admission devices, the intro 25 vide an improved reed valve structure for supplying fuel
duction of the fuel mixture into each crankcase is effected
mixture to the crank chamber of an internal combustion
as by means of one or two reed type valves formed on a
engine which embodies a plurality of valves assembled
?at apertured plate attached to the fuel inlet line at its
on a common fuel supply cage and adapted to introduce
opening into the crankcase chamber below the piston. The
large quantities of fuel mixture to the crank case in a
valves ‘in such a device commonly consist of a ?exible 30 most effective manner during each admission cycle.
reed‘plate covering the opening and adapted to ?ex or
These and other additional objects and advantages of
swing toward the crankcase chamber to direct the charge
the invention will become apparent from the following
of small horsepower internal combustion engines, whereby
moreror-‘less laterally into the chamber. While such reed
plate assemblies‘ have been extensively used, they have
neverthelesspossessed certain objections particularly with
‘regard to. e?iciency of operation, effective mixing and di
detailed description.
A clear conception of the features constituting the pres
35 ent improvement and of the mode of constructing and of
utilizing fuel supply ‘devices embodying the invention may
rection of fuel and relatively slow and restricted delivery
be had by referring to the drawings comprising and form
thereof to the chamber. Furthermore, the restricted num
ing a part of this speci?cation wherein like reference char
ber of inlet ‘apertures and reed type admission valves
acters designate the same or similar parts in the various
accommodated by the usual reed plate places eachsuch
views.
valve under heavy ‘duty at all times, and failure of one
FIGURE 1 is a part sectional side elevation of a typical
of the reeds to perform its function properly is immediately
internal combustion engine of the fractional horsepower
apparent and exaggerated in the engine’s operation.
type embodying the present improvement, the section
In other instances, fuel induction devices of various
beingtaken through a portion of one of the cylinders,
shapes and sizes have been proposed in efforts to increase 45 crankcase and fuel supply passage;
the number of inlet openings and reed valves and to so
FIGURE 2 is a somewhat enlarged exploded perspec
position the valves as to more effectively deliver the fuel
tive view of one of the improved valve assemblages show
and air mixture to the crankcase chamber in order to
ing one of the reeds and a reed retainer and limit member
improve volumetric e?iciency and mixture. One of these
about to be applied to one side of the cage;
valve assemblages is in the general form or'shape of a 50
FIGURE 3 is a similarly enlarged side elevation of
pyramid in which openings are provided on the four sides,
the openings being covered by the usual ?exible reeds
directed toward the crankcase chamber so as to deliver the
fuel and air mixture in a relatively ?at stream toward
the piston rather than laterally into the crankcase cham
her as in prior devices of the ?at plate type. While such
pyramidal-shaped reed Valve assemblages have resulted
in somewhat improved engine performance, the volumetric
ef?ciency and engine operation has still left something
to be desired.
-
It is therefore another object of the present invention to
one of the improved reed valve assemblages; and
FIGURE 4 is a section of the reed valve assemblage
taken along the line 4»—4 of FIGURE 3.
While the invention has been shown and described here~
in as being particularly applicable to one type of frac
tional horsepower internal combustion engine of the two
cycle type, it should be understood that it is not intended
to unnecessarily restrict the invention by virtue of such
limited embodiment; and it is also understood that cer
60 tain descriptive terms used herein shall be given the
broadest possible interpretation consistent with the dis
provide a reed-type valve assemblage for fractional horse
closure.
power internal combustion engines which obviates the
Referring to the drawing, the typical fractional horse
objections and disadvantages of prior devices of this gen
power
internal combustion engine shown comprises, in
65
eral type.
general, a fuel induction crankcase 6 forming a housing
3,042,013
3
4i
for a crank 7 carried by the main shaft 8 which is jour
nalled in bearings 9 and projects outwardly away from
the opposite sides of the crankcase; a cylinder 1t} secured
to the crankcase 6 and having therein a piston ~11 rc
ciprocable in the central plane 12 of revolution of the
crank, and which is drivingly connected to this crank by
a connecting rod 13; and an improved fuel supply device
associated with the crankcase 6 remote from the cylinder
M for introducing successive charges of fuel mixture into
plug 20 to apply power to the crank 7 through the cylinder
outlet port 18 into the exhaust casing 19.
While all of this functioning of the engine is old and
well known, it is important to introduce fuel charges of
One outwardly projecting portion of the crankshaft S
is provided with a fly-wheel l5 and with engine starting
assemblage causes least resistance to the flow of the fuel
mixture and therefore insures a full charge during each
suction stroke, and while the polygonal cage ‘22 has been
shown as having square transverse cross-section, a greater
or lesser number of ?at side surfaces 23 formed with
maximum volume to the crankcase 6 during each induc
tion stroke, and such action is effected by providing
numerous well distributed but relatively small inlet open
ings 25, 26 and valves 27‘ in the polygonal cage and by
directing the entering fuel streams approximately parallel
the crankcase and cylinder during normal operation of 10 to the direction of reciprocation of the piston 11 in the
plane 12 as well as in a direction laterally thereto. This
the engine.
mechanism con?ned within a housing 16 supported from
the crankcase 6‘, while the opposite outwardly projecting
portion of this shaft 8 may be connected to a variety of
appliances which are to be driven by the engine. The
interior of the crankcase 6is communicable with the
interior of the cylinder 10 through a side fuel supply port
17, and the opposite side of this cylinder is provided with '
an exhaust port 18 communicable with a spent gas re
openings 25 may be provided without departing from the
present invention.
The provision of ?at bounding surfaces is preferred
in order to permit tight closing of the reed valves, and
the cage 22 should also be of such length that the valves
27 will not swing into the path of the revolving crank 7,
while the stops 33 effectively limit the opening move
ment of these valves. With the introduction of maximum
charges of fuel mixture the engine will obviously operate
at high speed with maximum volumetric e?iciency, and
the invention is advantageously applicable to single and
ceiving and discharge casing 19‘, while the intermediate
end portion of the cylinder is provided with the usual
charge ignition spark plug 20.
The improved fuel supply device constituting the gist
of the present invention, preferably comprises a hollow
polygonal fuel mixture supply cage 22 bounded by ex
multiple cylinder internal combustion engines.
ternal approximately parallel side surfaces 23 and by an
Various modes of carrying out the invention are con
external transverse end surface 24- and being provided
with outwardly directed fuel passages or openings 25, 26 V30 templated as being within the scope of the following
claims particularly pointing out and distinctly claiming
terminating respectively at the surfaces 23, 24; and a ?ex
the subject matter which is regarded as the invention.
ible reed valve 27 swingable outwardly away from each
I claim:
of said surfaces and coacting with the adjacent openings
to control the ?ow of fuel therethrough into the crank
case 6.
1. For use in an internal combustion engine having a
35 fuel induction crankcase housing ‘a crank operatively con
When the device is installed the interior of the cage
22 should be in open communication with a carburetor
‘28, and the end of this cage adjoining the carburetor may
be provided with an external ?ange 29 adapted to be
nected to and revolvable in the central plane of an en
gine piston, a substantially cubical fuel mixture supply
device having several fuel inlet openings communicable
through the side walls thereof with the crankcase, said
clamped against a hollow adapter ?tting 30‘ and secured 40 inlet openings being bounded by adjacent surfaces dis
to the crankcase 6‘ by cap screws 31, as shown in FIGURE
1, it being understood that the adapter ?tting may be
formed as an integral part of the crankcase. The fuel
posed respectively approximately parallel and perpen
dicular to said plane, and a reed valve swingable out
wardly away from each of said surfaces and coacting
with the adjacent opening to control the ?ow of fuel
delivery portion of the cage 22 will then be entirely within
the ?tting 30 but closely adjacent to the crankcase interior, 45 therethrough into said crankcase.
2. For use in an internal combustion engine having a
with the side cage surfaces 23 disposed approximately par
allel to the plane 12 and the end surface 24 approximately
perpendicular to this plane.
Each of the reed valves 27 is also preferably provided
fuel induction crankcase housing a cnank operatively con
nected to ‘and revolvable in the central plane of an en
gine piston, a polygonal fuel mixture supply cage having
with an arcuate stop 33 secured to the adjacent cage sur 50 opposite sides and an end outwardly directed fuel inlet
faces 23, 24, and these stops limit the swinging move
ment of the reeds and prevent the valves 27 from striking
the interior of the ?tting 30‘ or the interior of the crank~
case and from swinging into the path of the crank 7. The
valves 27 and stops 33 may be formed singly or in pairs 55
as shown in FIGURE 2, and are fastened to the cage 22
by screws 34.
Suit-able leakage preventing gaskets 35;
may be interposed between the cage ?ange 29 and the
carburetor 28 and ?tting 30‘, and the cap screws 31 permit
openings communicable with the crankcase ‘and bounded
by adjacent surfaces disposed respectively approximately
parallel and perpendicular to said plane, and a reed valve
swingable outwardly away from each of said surfaces
‘and coacting with the adjacent openings to control the
flow of fuel therethrough into said crankcase.
3. For use in an internal combustion engine having a
fuel induction crankcase housing a crank operatively con
nected to and revolvable in the central plane of an en
convenient attachment or removal of the valve cage 22 60 gine piston, a polygonal fuel mixture supply cage hav
ing fuel inlet openings in four sides and an end thereof
while the screws 34 permit like application or replacement
all
communicable with the crankcase, said side openings
of the valves 27.
being bounded by adjacent surfaces disposed ‘approxi
When the improved internal combustion engine has
been constructed and assembled as shown in FIGURE 1,
and has been applied to the appliance which is to be driven
or actuated, the engine may be placed in operation with
the aid of the starter con?ned within the casing -16 in a
well known manner, whereupon the reciprocating piston
mately parallel to said plane and said end opening being
bounded by an adjacent surface disposed approximately
perpendicular to said plane, and a reed valve swingable
outwardly away from each of said surfaces and coacting
with the adjacent openings to control the flow of fuel
therethrou-gh into said crankcase.
11 will alternately draw successive charges of fuel mixture 70 4. For use in an internal combustion engine having a
fuel induction crankcase housing a crank operatively con
from the carburetor 28 past the reed valves 27 into the
nected to and revolvable in the central plane of an en
crankcase 6 and after being compressed within this crank
gine piston, a hollow substantially cubical fuel mixture
case the charges enter the cylinder 10 through the inlet
supply device having fuel inlet openings communicable
port. The piston 11 thereafter compresses the admitted
fuel charges which are subsequently ignited by the spark 75 through the side walls thereof with the crankcase, said
5
3,042,013
inlet openings being bounded by adjacent surfaces dis
posed approximately parallel and perpendicular to said
plane, and a reed valve swingable outwardly away from
said surface and coacting with the adjacent opening to
control the ?ow of fuel therethrough into said crank- 5
case, said reed valve each having an arcuate stop plate
associated therewith to limit its outward swing.
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,420,056
Seligmann 61328.1. _______ __ May 6, 1947 10
.
2,639,699
2,731,960
2,779,576
2,782,777
2,934,083
6
Kiekhaefer __________ __ May
Kireher et a1. ________ __ Jan.
'Morgenroth __________ _.. Jan.
Jasper ______________ _- Feb.
Norton ______________ __ Apr.
26,
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1960
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