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Патент USA US2410946

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Nov. 12, 1946.
L. E. JOHNSON
2,410,946
FUEL INJECTION MECHANISM
Filed April 10. 1945 ~
4 Sheets-Sheet 1
3
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INVENTOR.
BYL/ayd
‘ME.%
Jab/7:0!)
/2’7h' I
117'TQENEY.
4
Nov. ‘12, 1946.,
'
‘L. E. JOHNSON
‘FUEL
INJECTION
2,410,946
MECHANISM‘
Fil'éd April 10.. 1943
‘
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4 Sheets-Sheét 4
-HLM
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,INVENTOR.‘
L/ayd E. Jab/75017
“M,
’
ATTOENEYI
>
Patented Nov. 12,
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‘ UNITED" STATES-* PATEN T 7.
2,410,946 :
2,410,946 ‘r
OFFICE ‘
FUEL INJECTION MEcHAmsM .
‘ Lloyd E. J ohnson, Fon du Lac Township, Tazewell'
County, Ill., assignor to‘Caterpillar‘ Tractor Co.,
San Leandro', Calif., a corporation of California
‘ Application April 10, 1943, Serial No.4482,577 1;. '
2'Claims. (01. 251-145)"
_ My invention relates to fuel injection mech
caused by friction or rubbing, partsj is ofsuch
anism, and more particularly to, a fuel injection
nozzle ‘of the outwardly opening ‘valve type
adapted for delivering timedinjections of liquid
_ character asto enable the proper degree of com
pression to be placed on the spring so that all
fuel, into an internal combustion engine.
Nozzles of this character may be employed ’
either for the injection of a readily volatile fuel,
such as gasoline, into ‘an internal combustion
like nozzles may have like metering char-v
acteristics; is provided wit-h spring retainer
means which cooperates in providing for proper
compression on the spring, and which has a 1'
guideless mounting in the nozzle to preclude
engine of the spark-ignition type, or for the in
damping effect on the, spring; .is well shielded
jection of relatively vnon-volatile'fuel oil into a 10 against
the entrance of dirt and other deleterious
Diesel or compression ignition engine. Metering
matter which might adversely affect proper nozzle
of fuel to the nozzle is generally accomplished by
operation; is providedwith means to enable'ac
a fuel injection pump of any suitable type, which
curate control of the extent of opening. of the '
is adapted to pump a measured 'quantity'of fuel
valve;
and which is of relatively simple and
for each injection stroke of the pump. 'The pres
sure of the fuel created by the pump causes open
15 . economical construction.
ing of the nozzle valve to effect flow of fuel under }
pressure, into the engine.
Other objects of my
inventionwill become apparent from a perusal of
the following. description thereof.
Referring to the, drawings:
For e?‘icient engine operation, particularly in a
multiple cylinder engine with each cylinder of 20 Fig, 1 is a longitudinal sectional view of one
form of nozzle mechanism of my invention,
which is associated a fuel injection nozzle, it is
adapted for employment in a type of compression
extremely desirable that the individual'nozzles
ignition or Diesel engine in which it is now being
have a high frequency operation. In other words,
embodied; a portion of the precombustion cham
the valve member in the nozzle should open in a
minimum period of time for- discharge of fuel, 25 ber of- such engine being also shown, in section.
The scale of ‘Fig, 1 is drawn to approximately
and also close with a popping action to ‘shut off
fuel discharge from the nozzle in a ‘minimum _ three timesfull size.
Fig. 2 is an enlarged longitudinal sectional view
time period, to insure good atomization of the
of a valve assembly unit forming part of the
fuel when the nozzle opens, and proper metering
of the fuel at all engine speeds from idling to full 30 nozzle structure illustrated in Fig. 1.
Fig. 3. is an enlarged horizontal section taken
in a plane indicated by line ‘3-3 in Fig.1.
load speeds. Such action is particularly desirable
in high speed engines in order to provide for
proper fuel injection timing.
-‘
F18. 4- is an enlarged horizontal section taken
In order to obtain the desired high frequency ~ in a plane indicated by line 4—4 in Fig. 1.
Fig. 5 is an end view looking in the‘ direction
nozzle, it is desirable to employ a high rate spring
of arrow 5 in Fig. 2.
,
I
in association with the nozzle valve member, or,
in other words, a still’ spring which serves to close
Fig. 6 is a fragmentary horizontal sectional
elevation taken in a plane indicated by line- 6-6
the nozzle valve member‘ upon termination of
in Fig. 1.
,
~
,
‘
.
fuel injection and against which the valve moves
when it is opened by fuel pressure. Also, it is 40 Fig. 7 is a longitudinal sectional view of another
desirable that the weight of the springrand the
form of nozzle mechanism adapted for employ
mechanism operated by the-spring be relatively
ment in an engine wherein the valve may occupy
light so as to minimize damping of the spring
less space, such as in the head of a spark ignition
‘ engine; a- portion of, the engine being also shown
which might otherwise be caused by the inertia
of relatively heavy parts, thereby allowing the
spring to act fast in closing the valve.
_
45 in section. The scale of Fig. '7 is drawn to ap
proximately three times full size.
'
My invention has as its objects, among others,
the provision of an improved high frequency fuel
injection nozzle of the outwardly opening valve
type, designed to satisfy the above mentioned 50
requirements, and which employs a stiff or ‘high
rate spring; is provided with a valve member hav
ing a ?oating mounting in the nozzle sothat' dur
ing movement thereof there can be no dampingv
effect on the spring which might otherwise be 55
Fig. 8 is a horizontal section taken in a 'plane
indicated by line 8-8 in Fig. 7.
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‘
I F18. 9 is a fragmentary section taken in a plane
indicated by line-9—8 in Fig. 8.
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,
Fig. 10 is an enlarged longitudinal sectional
view of avalve assembly: unit forming part of the
nozzle structure ‘illustrated in Fig. 7.
‘
Fig.11 is a horizontal section 7taken in a plane
indicated by line ll—ll in Fig.
‘2,410,940
3
Fig. 12is a horizontal section taken in a plane
indicated by line |2—-|2 in Fig. 7.
Fig. 13 is a horizontal section taken in a plane
indicated by line |3—|3 in Fig.‘ '7.
In the embodiment of the invention illustrated
in Figs. 1 through 6, the fuel injection mecha
nism comprises a valve assembly unit A which will
be described hereinafter in greater’ detail and
which includes outwardly opening‘valve member
2 having a valve head 3 at one end thereof integral
4
production valve assembly units A, valve heads
3 may not all be of exactly the same axial thick
ness which may result from the usual dimensional
differences which occur in commercial produc
tion, or the heads 3 might not all seat exactly at
the same location on seats 6. Therefore, if nozzle
tips 2| were employed having recesses 21 all de
signed to have the same depth, the extent of open
ing of the valve might vary among different
nozzles. To insure that such extent of opening
will be the same for all nozzles, I provide nozzle
'tips 2| having recesses 21 of varying depths; and
with elongated stem 4, seat 6, spring retainer 1
associated with valve stem 4, ‘spring abutment‘
member 8, spring 3 compressed between retainer
‘I and abutment member 8, and sleeve || about
_ in assembling the nozzle, the proper nozzle tip
against a complementary tapered internal shoul
der in outer sleeve l2. Valve assembly unit ,A is
clamped in position within inner sleeve l1; and
to provide for strength to withstand the clamping
stress, sleeve I1 is preferably made of steel. At
its outer end, sleeve 33 is-formed with a right
angle extension 31 having fuel flow passageway 38,
and which is adapted for connection to the fuel
line (not shown) leading to the fuel injection
is selected by testing to insure that the extent of
opening of the valves will be the same in all
abutment member 8. As can be noted from Fig. 2,
assembled nozzles.
spring 9 holds all the parts of this assembly to
Means including the nozzle holder is provided
gether with the exception of sleeve II which ?ts
for transmitting clamping pressure through sleeve
around abutment member 8. In the. compression
ll of valve assembly A to clamp together seat 6
ignition engine in which such assembly is em
ployed, there is su?icient space to provide a holder 20 and nozzle tip 2| in the holder. In this connec
tion, it is, to be noted that inner, sleeve |1 ofthe
therefor of sui?cient thickness of metal to trans
holder is of less length than outer sleeve |2 of the
fer heat away from the nozzle; this being desir
‘holder, and'that sleeve ll of valve assembly A
able in a compression ignition engine because of
extends beyond end surface 29 of inner ‘sleeve H.
' the relatively high maximum operating temper
25 A plate 3| having central aperture 32 is sup
atures in such an engine.
ported on the end of valve assembly sleeve U ad
The holder includes an outer sleeve member l2,
jacent surface 29, and transmits clamping pres
within recess l3 in compression ignition engine
sure to sleeve | I to hold the previously mentioned
part |4 having external cooling ?ns l6. Prefer
I parts together. Clamping pressure is imparted to
ably, sleeve I2 is of a metal of relatively high heat
conductivity, ‘such as aluminum, for the pur- ,, plate 3| by sleeve 33 screwed in outer sleeve |2
of the holder; sleeve 33 and sleeve |2 being locked
' pose of conducting heat away rapidly from the
together by, means of L-shaped locking pin 34,
nozzle tip. Press ?tted’ within the outer sleeve
one leg of which ?ts through apertures in these
I2 is an inner sleeve member |‘| having con
parts,_and
the other legIof which lies in a recess
ically surfaced external‘shoulder l8 which seats
36 formed in the outer surface of sleeve l2. At
,
the fuel discharge end of the injection mecha 40 pump (not shown).
I preferably provide in sleeve 33 a fuel strainer
nism, vinner sleeve I1 is formed with an internal
39 to remove any relatively coarse foreign par
shoulder l9 on which is seated nozzle tip member
ticles, that may be in the, fuel. Any suitable
2| having peripheral shoulder 22 provided with a
strainer may be employed; the strainer illus
?at seating face 23 resting on shoulder l9, and
with an opposite ?at seating face 24 against which 45 trated comprising a cylindrically-shaped solid
member having a plurality of axially extending
rests one side of seat 6 of valve assembly unit A.
spirally-shaped grooves 4| leading from one end
Tip 2| ?ts with a light press ?t within the
of the member to the other, and which form com
aperture de?ned by internal shoulder l3, so as
plementary spirally-shaped ?ns 42, the edges of
to be readily insertable in and removable from
inner sleeve I1, and has an axially extending 50 which ?t with slight clearance with respect to
the inside wall of sleeve 33. As can be observed
elongated fuel discharge passage or ori?ce 26, for
from Fig. 6, each end of strainer 39 is formed
the purpose of effecting a penetrating spray which
with a pair of cross channels 43, the opposite ends
is desirable in the injection of fuel oil into a com
of each of'which communicate with sets of the
pression ignition engine. Passage 26 communi
grooves 4|. However, the channels 43 at either
cates with a recess 21 formed in tip 2| to ac
end of the strainer communicate with different
commodate head 3 of the valve which is normally
grooves than those at the opposite end. The
sealed against one side of seat 6 by spring 9. Upon
end of the strainer adjacent valve assembly unit
injection of fuel by the pressure created by the
A engages plate 3| which overlaps the inside of
fuel injection pump (not shown), the valve will
open to allow discharge of fuel; the extent of 60 sleeve 33, and consequently serves to seal off the
grooves 4| at such end of the strainer, which do
opening of the valve being determined bythe
not communicatewith cross channels 43 atthat
depth of recess 21. Thus, tip 2| serves as a stop
end.
for determining the extent of outward opening
. The opposite end of the strainer engages plate
of the valve. Preferably, the volume of recess 21
46 having an aperture 41 for flow of fuel there
‘ is at a. minimum with reference to the volume oc
throughfrom passage 38; plate 45 and strainer 33
cupied. by head 3 to minimize the volume from
being held in position by apertured spring 43 in
which fuel ‘might escape after injection, thus
the form of a bowed ring of sheet metal. As with
minimizing dribbling at the nozzle. In this con
respect to plate 3|, plate 46 seals of! the grooves
nection, head 3 is provided with a cross slot 28
4| which do not communicate with cross channels
to allow flow of fuel into fuel discharge passage 26
43 at the end of the strainer covered by plate 46.
when the valve‘opens.
,
Thus, fuel entering the ends of grooves 4| at the
In order to have the same fuel injection char
inlet end of the strainer cannot escape from the
acteristics in all like fuel injection nozzles, it is
same groovesat the discharge end of the strainer,
desirable that the extent of opening of the valve
be the same for all such like nozzles. In various 75 but must flow over ?ns 42 which will strain out
2,410,946
foreign particles, andv into- the" grooves which
I64 Ion'Ithe stem by 'mésnsj'brsprmg
communicate with cross channels “at the‘ I ashoulder
clearance space 65 ‘bei ngI vprovided : about stem- . 4 between the retainer and,v the stem.‘ A conically
relatively viscous fuel oil such as is encountered 7 shapedhead '66 is formed Iadjacent shoulder 64
I
strainer discharge end. The typev of strainer
‘ described is quite e?icient for the straining of
‘
merelyjtov enable gripping and centeringbf valve
I in compression ignition‘engines' .
member‘ 2'by a suitable tool" during manufacture
'For clamping the nozzle on the‘ engine, I provide
an externally threaded ‘nut 49 having shoulder I ' thereof. Abutment'surface BJonItheretainerds
I
I
made flat, Iand‘IspIrin'g 9 is‘squa'red off at its ends
to engage
an end Iof'oute'r
sleeve l2, ‘
5| adapted
Ito ‘seat accurately; against; abutment surface *61,
as well as abutment‘spacernaffTo enable posi
tioning of the retainer aboutjstem 4,,it is provided
and which is adapted to be screwed into?engine
' part l4 to
clamp the
apply pressureagainst’ sleeve 12‘ and‘
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opposite endof
sleeve 1 I2v against such
I,
‘ engine part.‘
'
‘ with an inwardly extending, slot 68. through which
The seating (and ‘of sleeVe‘IlZ is pro
stem 4 may be inserted. The periphery "69 of
I
with I sleeve l I,"
52 adapted to engage a complementary conically v15 ‘ the, retainerv .isf‘j'free of ' .contact
thus~ providing a guideless mounting therefor in
shaped surface on‘ a shoulder 53 integral‘ with
engine part 14. Preferably, clearance space 54 . the nozzle.I '
vided with a‘ sonically-shaped seating surface .
The guideless mounting of. the’l‘valve not only
‘is provided adjacent the discharge end of the I
‘allows automatic centering thereof by " the fuel“
nozzle to provide insulation at .that pointj'and ‘
j stream, as was previously explained, but also pre- I
cludes ‘ damping .effect on ' spring 9 which. would
be caused if the spring were .to work against rub
the portion of sleeve " I 2 adjacentI the discharge
end of the nozzle is provided with longitudinally
extending splines 56
I
for the purposeI of
‘enabling I
1 vbing or'frictionallyengaging parts. Thus when‘
thesleeve to be turned by a suitable ‘tool for
the spring closes the valve.‘ after termination of~~
fuel
injection, it only has, to move the weight of
In assembling the nozz‘leytip Mv and valveas
sembly unit'A are ?rst 'pos‘itionedin ‘sleeve. I‘! 25 the valve and the'ret'a‘iner. .' This enhancesfast
closing of the valve withIa popping'action; ' Fur
which is press ?tted‘in sleeve l2." Then, nut 49
screwing on sleeve 33.
5
,.
‘
.
thermore, opening of the'valve by fuel pressure
is also made faster by the eliminationIof rub
may be placed over sleevevlz. Strainer 39, and
its associated parts'may' then be. positioned in‘
sleeve 33 which is insertable through aperture 51
‘Y in nut 49; and upon screwing sleeve33 in sleeve
l2- against plate 3|, the parts will all be held in
position.
I
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bingparts,
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lv
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With respect to prior. outwardly opening noz
.
.,
._
.
‘zle constructions wherein 'afspring ‘retainer is
>. screwed on a valve ‘stem, I have found that such
'
, arrangement is not desirable becauseia retainer
‘Valve assembly unit
A of my invention‘forms
I
an important part thereof. 'With reference to
Fig. 2, it is to be ‘noted that the' entire. valve
nut screwed on the stem must be employed in as
jsociation with othermeans for‘locking the 'nut.
This ‘creates extra weight, the inertia of which
member 2Ihas a ?oating mounting in thenozzle,
as it is'not piloted in any way.‘ Stem 4 passes
,
loosely or freely through an enlarged aperture 58
‘in seat 6, ‘and through an enlarged aperture 53’ 4-0 I
in spring abutment ‘spacer member 8. Also, re-y
'tainer 1 is'not guided or pilotedin any way in -
dampens the effect ofthe spring,‘ thereby'im
peding fast action in opening .andjclosmg of the
valve. Furthermore, it
is relatively difficult with
a retainer screwed on the stem to have )it hold
its exactposition. at alltimes; and slight‘change
' in the position
thereof causes variation in‘.v the
I
load imposed on the spring, which results in non
' during opening thereof solely by the fuel ‘stream ‘
sleeve ll.
Thus, valve member 2 is" centered
uniform spray characteristicsfamong various noz
' I 'l?ow'ing through the nozzle; and as a result the
zles on an engine. - Since the retainer of my in
vention is‘held'fIreely againstshoulder 64, spring > '
abutment‘ surface 61 thereof will
I always
_ I
be at a I
peripheral‘o-ri?ce, which is formed when valve
head 3 is moved away-from the seating" side 59
of seat 6 by fuel pressure,_-will always ‘be of the
‘same width around'its' entire‘periphery, thus
insuringa uniform spray at all times. This might .
not otherwise be the case if the valve “member 2
?xed position relative to valve stem'4."
Another important feature .of the nozzle c'on- '
' struction'. of my inventon. lies in
I
the
provision
‘ of the removably mounted- abutment orspacer .
were guided or piloted in the nozzle because such '
member ,8 which is held by spring 9 against: the I
arrangement might produce cit-centering of valve
" . sideof seat 6 opposite tothat against which valve
- head 3 when it opens by fuel pressure.
head 3 seats whenthevalve is closed. in assem
To insure proper seatingof head 3 about its
bly of the parts of ‘valve assemblyA, stem 4 is
entire periphery, against seating side 59 of seat
inserted ‘through, aperture 158 of seat I6 and
5 when the nozzle is closed, seating surface 6| of ’, through
spring 9, Retainer 1 is then? slipped
I head 3 is formed to have the shape of a ‘segment
over stem 4 and spring}! is held againstretainer
of, ajsphere, and is adapted to engage along an.
edge ‘62' at an inner beveled part 63 in seating '60‘ abutment surface 61 by any suitable instrument.
"side 59. Thus, should there be slight misaline- I
ment of valve stem 4 in the closedIposition of
stem 4 between seat 6 and the end. of- the spring
the valve, head 3 will always be tightly‘ sealed
_9 opposite that resting‘ againstvretainer abut?
about its entire periphery. This is important in
precludingdripping. at the nozzle. In this con
nection, it is to be? observed that the peripheral
surface of head 3 ‘throughout its entire path of
movement during opening and closingv of the
nozzle, has relatively wide clearance in recess '
Abutment member ‘8, which is provided with an
inwardly extending slot 1|, is-thenslipped over
65
ment surface 61. I provide abutment members 8
of various thicknesses; and’byv a suitable cali
brating instrument, I measure the load on spring
.9 resulting from theinsertionof various abutment
members 8. , By selecting an abutment member
of the proper thickness, the same predetermined’
21' of nozzle tip 2|. ‘Such guideless mounting of
the head cooperates in permitting accurate seat 70 load maybe placed on, spring 9 for all like-~noz-'
zles assembled. Thus, such arrangement .00,
ing thereof. .
I
With particular reference to spring‘retainer 1, ‘1 ’ operates with the other features ‘mentioned in
I insuring that alllike nozzles will have. uniform
it is to vbe noted that it ?ts freely .or loosely
about stem 4, and is 'held against a bevelled
spray characteristics.‘
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After assembly of the selected abutment mem
I
2,410,040,
to recess I00; the axes of such passages being ar
her. 0, sleeve I I, is then slipped over the periphery
of the abutment member to center it properly.
ranged tangentially with reference to the center
or recess I00.‘ Thus, when the valve is opened by
pressure of fuel, a swirling motion will be im
parted to the fuel. In this connection, it will be
noted that ori?ce. I" is- shorter and of larger
diameter than ori?ce 20in the previously de
Thus sleeve I I not only serves to transmit clamp
‘ ing pressureiohold the nomle assembly together
in the manner previously described, but also
serves as airetaining means for abutment mem- '
her 0. In this connection,‘ it isgto be observed
scribed nozzle'.--so as not to impede the swirling
that theportion of sleeve II adjacent abutment
e?ect impartedtothe fuel.
_
member 0 is provided with increased thickness
As with respect to the nozzle of Figs. 1 through
at ‘I2 to center the end of spring 0 adjacent 10
in nozzle tip 00 con
abutment member'l. ‘
. The embodiment ‘of the invention illustrated
in Figs. 7 through 13 isessentially the same as
.6; the depth of recess I00 _
. itrols the extent of opening of the valve. To in.
sure that the valve will open to the same extent
for'allv like nozzles manufactured in production,
that previously described, insofar as the con
tips 00 are, provided with recesses I00 of prede
struction of valve assembly unit A? is concerned. 15 termined depth: and by selecting a tip having a
Thereforeysuchunit will be described primarily
proper ‘depth recess, during assembly of a nozzle,
the extent of opening of the valve may be made
uniform for all nozzles as in the previously de
with reference to the differences between it and
the previously described valve assembly unit A.
Unit 'A‘ comprises valve member 02 including
modi?cation.‘
valve head 02‘ and stem 04, seat", spring re 20 scribed
Although any suitable strainer-may be em
tainer 01 mounted freely about stem 80 and thrust : vployecl about tube I02; in the embodiment of the
against shoulder 00 on stem‘ 04 by spring 00, and
invention illustrated, I preferably employ as the
‘ spring abutment spacer member-0| interposed be
strainer a spring coil III in which the individ
tween spring 08 and seat". Spring retainer 01
ual coils .are relatively close together so as to
is provided with ‘inwardly. extending slot 02 to 25 strain out foreign particles that may be in the
enable the retainer to be slipped over stem 04;
and abutment‘ member 0| is formed wlth'a simi
fuel. ,. Tube I02, as canbe seen from Fig. 8 is
‘non-circular in cross section, and its corners II2
lar slot 50.‘
‘
are formed with screw threads III in which coil
predetermined
thick-.
‘Abutment member 0 I is of
III is screwed; coil III being spot welded to tube
30
ness to place a predetermined load on spring 00;
I02 at suitable points I“ to hold the coil ?xedly
and the'parts are assembled in the‘ same way as
in position. Preferably, the outer peripheral sur
in the previously described embodiment of the
face of the coil is ground flat as shown in Fig.
invention, a sleeve 04 being provided about abut
9, so as to eliminate any wide spaces between
ment member 0| to maintain the'abutment mem
the interstices of the coil in which relatively wide
ber centered. In this connection, sleeve 0| is 35 particles might become caught, and thus clog the
also provided with a portion of increased thick
ness 00 adjacent abutment 9| to serve as a cen
The construction thuslfar described provides a
strainer.
tering means for spring 00.
As can be seen most clearly from Fig. 10, the ‘
valve assembly unit‘A’, is contained in a holder 40
01 which is in theform of relatively soft ductile
seamless metal tubing having its opposite ends
00' pressed or rolled over nozzle tip member 99
and a plate member III, respectively. The pe
rlp _eries of both nozzle tip member,” and plate
member IOI are formed with tapered surfaces
I00; and when the ends of holder 01 are engaged
over'these end parts, the entire assembly will
.
I
complete unit, as shown‘ in Fig. 10, which may
be mounted in the engine. If the strainer de
y. scribedis not employed, the unit will be the same
, , as that illustrated in Fig. 10 with an ordinary
plate substituted for flange I0 I .
Fig. 7 illustrates a form of mounting means for
'
the nozzle in an engine. Such mounting means
will ofcourse vary with various engines, depend
ing upon space and size limitations. The mount
ing means illustrated comprises an adapter
sleeve ,I I6 screwed in head III of the engine, and
form a compact unit in which holder 91 serves
having
intermediate cooling ?ns “'8 located in
50
as a tubular capsule providing a sealing envelope
space ,IH) in the engine head. Splines I2I are
for the parts contained therein. Furthermore,
formed on adapter Iii to enables. suitable tool
nozzle tip 09, seat 00, sleeve 04, and plate IOI will
to be engaged therewith for screwing of adapter
be'rigidly clamped together by clamping pressure
I it into head Iil. Internal threads are provided
transmitted through sleeve 04. In this connec
in adapter I I6 at the end opposite to that screwed
55
tion plate IOI, although it may be a separate
'in the engine head, into which an elongated
member if so desired, is formed as an integral
clamping sleeve I23 may be screwed for clamping
?ange on strainer tube I02 which has apertures
the nozzle in position. The tapered end parts
> III to allow flow of fuel into the interior there
I00 of the nozzle enable proper centering thereof
of, and a strainer I04 about the outside thereof
when clamped in position.
,
60
which will be more fully describedvher'einafter.
To
facilitate
removal
of
the
nozzle
when
sleeve
The head of the nozzle valve of Figs. 7 vthrough
I23
is
unscrewed,
I
provide
a
sleeve
I20
within
13 is designed‘ for injectionof volatile fuels, such
clamping sleeve I23 and which has one ‘end
as gasoline, into a spark ignition engine. In
screwed onto a boss I20 integral with strainer
such engine, it is desirable that the fuel spray
tube I02, and the opposite end'provlded with a.
65
be more ‘ diffused than fuel oil injected into 9. ‘ ?ange I2'l adapted to engage an internal shoul
Diesel engine. For thispurpose, valve head 83
der I28 formed in sleevel23; the sleeve‘ lube
which is contained in recess I06 in nozzle tip
ing formed with apertures I20 to allow fuel which ‘
memebr 90, is so formed as to impart a swirling ' ?ows therethrough, to ?ow into sleeve I22'and
motion to the fuel for passage through discharge
through apertures I02 in strainer tube 102, to
ori?ce or passage I01 in nozzle tip 80. With ref 70_ ‘the nozzle. Since flange I21 is engageable with
erence to Fig. 11, it will benoted that the side of
shoulder I28, it will be apparent that upon un
head 03 adjacent ori?ce I01 is formed with a cen
screwing
of clamping sleeve I23, the entire nozzle
trally disposed recess I00 in line with ori?ce I01,
assembly will be removed from the engine when
and with a plurality of inwardly extending pas
sages I00 leading from the periphery of the head 75 sleeve I20 is lifted oi! the engine. 'A notch I20
2,410,940
9
I .
is formed in ?ange I21 01' sleeve I24 toenable in
sertion of a Suitable tool for screwing such sleeve
relative to boss I26 01 strainer tube I02... To pre
vent turning of sleeve I23, when the nozzle is . '
clamped in position, an aperture I30’ is provided
therein for insertion oflocking wire that may be
to any considerable extent when it is desired to
connect it with or disconnect it from sleeve I23.
I claim:
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1. 'A fuel injection nozzle comprising an aper
tured valve seat, an apertured spring abutment
member adjacent the seat, a. valve stem passing
with clearance through the seat and abutment
wound about‘a suitable part of the engine.
A special ?tting is provided for connection 01’
members and having a head On one end engage
fuel line I3I to the described nozzle mounting
able with the seat, a spring retainer loosely con
means, which enables proper connection of the 10 nected
with the opposite end of the valve stem,
fuel line irrespective of the‘~ angular. position
aspring interposed between said retainer and
thereof with respect to the nozzle axis. With
said abutment member to urge the ,valve head
reference to Fig. 7, it is to be observed thatthe
toward
the seat, and a separate sleeve member
end of sleeve I23 opposite to the nozzle end, is
provided with an inward taper I32 over which 15 embracing the abutment member and a portion
of the spring to center them relative to the seat
complementary tapered ring I33 is adapted to
but
free of contact with the retainer member
?t; ring I33 being formed with an internal an
and the greater portion of the spring whereby the
nular fuel passage I34, and being provided with ’ valve stem is unguided with relation to the seat.
tubular part I36 into which fuel line I 3I is rig
2. A fuel injection nozzle comprising a seat
idly connected and sealed by suitable welding 20 having an aperture therein, a valve member hav
I37. Ring I33 is clamped in position by a cap
ing a head adjacent one side of the seat and a
screw I 38 screwed into clamping sleeve I23, and
stem. extending through the aperture, the stem
having a head I33 between which and ring I33
having a guideless mounting in the nozzle, a
is interposed sealing gasket I4I. Cap screw I38
shoulder on the stem, an abutment member re
is provided with internal passage I42 communi
movably positioned at the opposite side of the
cating with apertures I43 in the wall thereof, to
seat and through which» the stem extends with .
permit ?ow of fuel from passage I34 in ring I33.
clearance, spring retainer means about the stern
Apertures I44 in head I39 of the cap screw per
adjacent the shoulder and having a guideless
mit insertion of locking wire which may be wound
mounting in the nozzle and a free mounting rela
about Dart I36 to hold cap screw I38 against 30 tive to the stem and moveably engaged with the
turning.
-?
shoulder, spring means about the stem between
From the preceding, it is seen that irrespec
the abutment member and the retainer means,
tive of the angular position of fuel line ‘ I3I, it
and a sleeve about the abutment vmember and
may be readily connected by the described con?
the spring means engaging the periphery of the
nection, to sleeve I23, and that because of the
abutment member for retaining the abutment
tapered ?t at I 32 between the end of the sleeve
member in position, the sleeve being separable
and ring I33, the connection will be tightly main
from the seat and having a portion adjacent the
tained irrespective of engine vibration. It is to
abutment member ‘for centering the spring
be noted that the tapered ?t I32 is only at the
means and the remainder of the sleeve being free
end of sleeve I23 and the part of ring I33 ad
of engagement with the spring means.
jacent suchend, and not with the entire ring.
As a result, fuel line I3I does not have-to be bent
E. JOHNSON.
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