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Патент USA US2406296

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Aug. 20, 1946.
‘ Filed Aug. 21, .1945
Patented Aug. 20, 1946
Richard Joseph I?eld, Birmingham, England, as-~
signor to Joseph ‘Lucas Limited, Birmingham,
' Application August-21, 1945, Serial No.'611,754
In Great Britain July7, 1944.
5 Claims. (Cl. 103-44)
This invention has, for its object to provide an
improved liquid fuel supply device for use with
an internal combustion prime. moverof the kind
having a fuel supply system which is fed by a
pump, the latter ,derivingits motion from the
prime mover. The purpose of the device is to
supply an adequate initial charge to the system
when starting the prime mover, the rate of actua
tion of the pump. at that ‘period being normally
inadequate and a supplementary supply device
being, in vconsequence necessary.
In the accompanying sheet of explanatory
Assuming the larger, capacity‘ bodypart -c to
have previously been ?lled with liquid fuel, and
the valve m to be in the position shown in Fig
ure 1 in which it ‘connects the hollow ‘stem d with
the delivery passage 1‘ leading to the prime mover
connection i, the setting of the pump in motion
by actuation of thestarting motor of the prime
mover, causes fuel to be supplied by the pump to
the. adjacent end of the smaller capacity body
"part 'b. The rate of this supply may be slow, but
its effect on the piston q is to move the latter
against the action of its loading springs 'in the
direction for displacing the content of the‘larger
capacity body part c alonggthe hollow stem 01
Figure 1 is a diagrammatic sectional side View
of a liquid fuel supply device constructed in ac
cordancewith the invention.
16 andvthrough a transverse passage t in the valve on
Figure 2 is a fragmentary sectional view show
ing the control valve inv a'di?erent position.
Figure 3 is a view similar to Figure 1 illustrat
ing a modi?ed form of the invention.
In carrying theinvention into eilect as shown .
in Figures 1 and 2, I employ a hollow cylindrical .
to the connection i leading to the prime mover,
openings u in the endof the stem remote ‘from
the valve providing .the required‘ communication
between the body part ‘c and the stem. This dis
20 placement is ‘made in su?icientvolume and at a
sufficient rate to ensure the required adequate
initial supply of liquid fuelfto the prime mover
body a'having a pair of coaxial parts b, c of dif
until the pump can'establish the. normal direct
ferent internal diameters, and provided in its in
supply. Meanwhile the piston lq slides along the
terior with an axially arranged hollowstem d.v 25 stem 02 under thepressure of the liquid supplied
In the outer end of the body part ‘b, whichis of
by the pump, and when it approaches the end .of
smaller internal diameter than the .body part c, ' its movement the small end of the piston uncovers
are formed three passages e, 1‘, g whichat their
ports 1; in the stem which allow ?uid to flow from
outer endsterminate in connections h, z‘, y'for
the pump into the stem and thence through the
pipes (not shown) leading respectively to the sup
ply pump, the primemover, and ya sump. The
inner ends of the passages e, 1‘, y and theadjacent
end of the hollow stem d are terminated by a
valve ‘112 to the prime. mover. At the same time
fuel can enter. the enlarging space between the
larger ,end of the piston q and the inner end of
the body part c from the passage g leading to the
sump.. In this phase the valve m prevents direct
intercommunication between the pump and sump
passages e, 9. When it is required to stop the
prime mover the valve m is turned to the position
transverse bore 70 in the body part b, and in this
bore is arranged a rotary valve. m adapted to
effect the controls hereinafter described.‘ Also
the inlet passage'e, that is, the passage, communir
eating with the pump connection h, is provided
shown in-Figure 2 ‘in which it cuts oil the con
with a branch passagen leading to. the. adjacent
nection with the delivery passage 1‘ and intercon
end of the interior of thebody part b. Likewise 40 nects the pump and sump passages e, g and the
the passage 9, that is, the passage ,communicat.-_
stem 01. The piston q now returns to its initial
ing with the sumpconnectionj is provided with
position. under the action of .the spring 5, and
a branch passage 0, this being arranged incom
while so doing liquid flows from the pump into
munication with the adjacent end of the interior,
the larger capacity bodypart c throughvthe stem
of the body part c, and ‘beingprovided witha 45 d, therebyproviding the volume of liquid fuel to
non-return valve 10.
be used in the next starting operation .of.the prime
Within the I body a is slidably ' arranged a
Duringthe. return of. the piston q the .
stepped piston q consisting ‘of two parts ofv differ
fuel previously drawn into the body part 0 past
ent diameters situated respectivelyv in the. body
the non-return valve p is displaced past the larger
parts b, c. The pistonq isprovided with pack will) piston packing ring r.
ing rings 1‘ of U- or equivalent cross-section, and
In addition. to thepassages above described,
is loaded by a spring s arranged to. move the pis
ton towards the end of the body a containing the
valve m.
The‘ mode of action is as follows: ‘
I preferably also. provide a balancing passage :1:
in the smaller end of ,the piston q,.this balancing
passage being ‘arranged‘toico-operate with the
60 ports 12 in the stem'd for putting ‘the latter into ‘
formed at or near its closed end with ports 21
through which liquid can flow from the passage
3 communication‘ with the inner end of the body ‘
part 0 when the piston approaches the end'of
_ H to the chamber 26 when the by-pass valve is
its movement under the action of the liquid sup- ~
_ ‘ plied by the pump,rthus balancing the ?uid pres
in an appropriate position. The initial position
of the by-pass valve’ 25 is determined by an adjust
; sures on the two sides of the large end of the t
able abutment 28 on which the valve rests under
the'action of its loading sprin'g29. In this posi
tion of the by-pass Valve 25 a restricted quantity
munication between the delivery passage 1‘ and :r, _
of liquid fuel can flow through the ports 21 from
the atmosphere or a drain when the supply of fuel ‘
the vpassage I] to the chamber '26 and thence to
to the prime mover is cut o?l.)
the by-pass passage 24.
For enabling the valve m to eifect the controls ‘v
It will be seen that the end of the automatic
above described, the ends of the transverse pas
valve 1 remote from its loading spring I6 is ex
sage t in the valve are enlarged as shown.
1 piston, , Further’ I may provide in the peripheryv ?
; of the valve m a groove y‘for establishing‘com
posed to the fuel pressure inthe passage l1.
/ In the modi?ed construction shown in' Figure 3
When this pressure- rises’ to a predetermined
" l I employ a body 2 which is provided withv inlet
and delivery connections h1,>i1 for pipes (not v
amount the automatic valve ‘I ‘opens and estab
of the supply pump'and the prime mover: '-At a ‘ ~
l1; Ill." '
shown) leading respectively to they delivery-side;v ‘> _ lishes 'free communication between the passages
Therenlargement 48L of the bore 4 containing I
the automatic valve 1 communicates with a con
position adjacent to the outlet connection ‘i1 the "
body 2 is bored to form a stepped cylinder a1,
and in this cylinder is slidably arranged a stepped ‘
nection 30 for a pipe (not shown) leading to the
suction side of the supply pump. Also the'bore
enlargement 4EL is connected’ by a passage3 I‘ to a
piston all,’ the latter being loaded by a spring 51.
~ Parallel with the bore -of the cylinder a1 there ‘
space'l32 in the body'2_ containing the rack 2| 7
' and pinion 26] ‘associated with the throttle valve
are formed in the body 2 three other and-smaller 1
' bores 3,14, 5, and in these three bores are respec- ‘
tively arranged three slidable plunger-like valves ‘'
8‘. ,Moreover, the bore enlargement 4a is con
let connection 2'1 and the passages 9, NJ is con- 1 '
the throttle valve 8 is formed with an axial bore ' V
nected by another passage33 to one end of the
bore3 ‘containing the control valve 6, the other’
V The ?rst bore 3 communicates with the outlet ‘
end of this bore (which contains the rack l3 asso-'
connection ilyand is connected by passages 79,1
- Ill, to the larger end of the cylinder al‘and the‘ 30 vciated with the control valve) being in communi
cation with a vent or drain opening 34. Further,
second bore 4. Communication between-the out
35 for permitting access of fuel from the'pas
trolled by the _valve_6 (herein termed the control 1
H to the remote end of the throttle valve,
valve) which is slidable in the bore 3." The control 1
valve Bis operable by an external lever H through 1 35 vso that the ‘ends of this valve are subject to bal
anced fuel pressures.
a pinion l2 and a rack' I 3, or by any other suitable \
Assuming that the throttle valve 8v is open,
the'larger-end of the cylinder a1 is ?lled with
At oneend the second bore, 4 communicates‘
liquidfuel, and the control valve 6 is in its open :
with‘a passage [4 leading to the smaller end of
the cylinder a1, and at or ‘near its other end this 40 position as shown in which the larger end of the
cylinder communicates with the-outlet connec
borelis formed with any enlargement >43. éThe‘
valve: 1 (herein' referred ‘to'as the automatic‘ ' tion ‘i1, the setting of the pump in motion’ causes
fuel ‘to be‘suppliedrby the pump to the prime
valve)-»in the bore 4 is loaded by a spring Hiev
mover through the by-pass' valve 25 and the de
situated in the bore enlargement 4a and acting‘
connection ail, the initial pressure of the
on a head'ltL on the adjacent end of’ the valve},
‘liquid. fuel in the passage I‘! being insufficient to v
The-other end of. the automatic valve 1 is of
' conical‘ or other form‘, and co—operates with an - openv the automatic valve 1, or to overcome the ‘
spring .91. As the pump. accelerates’ the difference '
annular seating or shoulder IS in the bore 4 for‘
controlling communication between the passages. m in the ?uid pressures acting 'on opposite sides of '
the by-pass valve 25 increases until it reaches
I0, 14..
value which causes ,the'by-pass'valve to close
The third'bore 5-communicates‘with the inlet1 aquicklyiagainst
the action of its loading spring 29.
‘ connection chi, and is connected at one end to‘
The consequential rise’ of pressure in the passage
@ second bore 4‘ and the associated passage I4 by‘
I'Lby acting on the smaller end of the piston ql,
another vpassage IT. The adjacent end of the
valve 8 ,(herein termed the throttle valve) in‘ ' moves the latter against the action of its load- _
ing spring 81 and discharges liquid fuel from the
the bore 5 is of conical or other form, and co-V
larger end of the cylinder through the delivery '
operates with an annular seating or shoulder It1
connection 2'1. Further rise of pressure in the
in‘ this bore for regulating the rate of ?ow of
passage )l'l opens the automatic valve 1, enabling
liquid fuel from the inlet connection 71.1 to the"
the ,full supply of liquid fuel required by the
passage ll. The throttle valve~8 is operable by.
primelmover to ?ow from the passage l1 pastethe
an external lever l9ithrough a pinion 20 and a
automatic valve to the delivery connection 2'1. This
rack 2!, or by any other suitable means.
- r
enables the piston 611 to return to its initial posi- ‘
' To-permit a restricted quantity of liquid fuel
tion,’ and the larger end of the cylinder a1 to -
to?owfrom the passage I‘! to the passage It,
be re?lledthrough the passage 9 with the volume
of liquid fuel to be used in the next starting oper
‘ and thenceto the outlet connection i1 when the
prime mover is being started, a by-pass passage
ation of the prime mover.
' 24 is provided? between the passages 11, Ill, this '
The cylinder a1 is
providediat the junction of its larger and smaller
by-pass ‘passagelbein'g controlled .by a valve 25 r
partjserwith a venting passage 36 to prevent en
H. The by-pass valve 25' mayiconsist' as shown 70 trapped ‘air orleakage ?uid from interfering‘with
' the proper action of the piston ql. To stop the
of a spring-loaded hollow ‘piston which'is slid
responsive‘ to the liquid pressure in the'passagei
prime‘ mover the control valve 6‘ is moved to its
close'drposition in which it interrupts commuhie.v
ablein a chamber 26 connecting the bypass pas‘
sage 24 to the passage l1,‘ and which has a closed
end exposed to the interior of the last mentioned"
passage, the peripheral wall of the piston‘ being
cation between the delivery connection i1 and the ,
passages 9, |ll,:and establishes communication
between the delivery connection and the drain
opening 34. Simultaneously the passage IT is
connected to the suction side of the pump by
the passage connected to the larger part of the
bore, and means for establishing communica
tion between the said passages under the control
way of another passage 39 in the body 2, a re~
cess 40 in the adjacent side of the control valve
of the fuel pressure acting on the piston.
‘27. A liquid fuel supply device as and for the
purpose claimed in claim 1, in which the fuel
6, the passage 33 in the body, the chamber 4*‘.
and the connection 30. Subsequently the auto~
matic and by-pass valves 1, 25 return to their
initial positions preparatory to the next starting
passage connecting the larger part of the cylin
drical bore in the body to the delivery opening is
formed in part by a hollow stem on which the
10 piston is slidable, the stem being formed with
For enabling a small quantity of liquid fuel, . ports whereby the smaller part of the said bore
su?icient for slow running of the prime mover,
is connectible with the interior of the stem under
to flow from the inlet connection hi to the pas
the control of the piston.
sage ll independently of the throttle valve 8,
3. A liquid fuel supply device as and for the
any convenient by-pass passage 3'! is provided in 15 purpose claimed in claim 1, in which the fuel
the body 2, this passage ‘being controlled by a
passage connecting the larger part of the cylin- '
manually adjustable needle valve 38.
drical bore in the bodyto the delivery opening
By this invention I am able to effect the re
quired initial supply of fuel to the prime mover
is formed in part by a hollow stem on which the
piston is slidable, the’ stem being formed with
in a very satisfactory manner. The invention is 20 ports whereby the smaller part of the said bore
not, however, restricted to the examples described
is connectible with the interior of the stem un
as subordinate details may be modi?ed to suit
der the control of the piston, and the control
different requirements.
valve being of rotary form and arranged between
Having thus described my invention what I
one end of the hollow stem and the inlet and
claim as new and desire to secure by Letters Pat 25 delivery openings.
ent is:
4. A liquid fuel supply device as and for the
1. For usewith an internal combustion prime
purpose claimed in claim 1, in which the means
mover of the kind speci?ed, a liquid fuel supply
for establishing communication between the liq
device comprising in combination a body formed
uid fuel passages includes a second valve respon
with a cylindrical bore of two different diameters, 30 sive to the fuel pressure acting on the piston.
and with liquid fuel inlet and delivery openings,
5. A liquid fuel supply device as and for the
liquid fuel passages for connecting the smaller
purpose claimed in claim 1, in which the means
part of the bore to the inlet opening and the
for establishing communication between the liq
larger part of the bore to the delivery opening, a
uid fuel , passages comprises in combination a
stepped and spring loaded piston slidable in the 35 second valve responsive to the fuel’ pressure act
bore under the action of liquid fuel/supplied un
ing on the piston, and'a spring loaded by-pass
der pressure to the smaller part of the bore from
valve responsive to fuel pressure for providing a
the inlet opening, a control valve movable to dif
restricted communication between the passages
ferent positions for establishing and interrupting
when the second valve is closed.
communication between the delivery opening and 40
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