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Патент USA US3035603

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May 22, 1962
P. B. KAHN
FUEL CONTROL GOVERNORS
Filed Jan.- 11, 1961
3,035,592
United States Patent 0
3,h35,5§2
Fr‘
ICC
Patented May 22, 1962
2
1
the other on an idler shaft 5. The idler shaft 5 has an
axial bore 6 communicating with the delivery side of
3,035,592
FUEL CONTROL GOVERNORS
Peter Bruno Kahn, Loughton, England, assignor to The
the gear pump and is coupled in a ?uid-tight manner
Plessey Company Limited, London, England, a British
with a governor shaft 7 which forms a coaxial extension
of the shaft 5 and has an axial bore 8 which forms an
company
extension of, or communicates with, the bore 6 of the
.
Filed Jan. 11, 1961, Ser. No. 82,136
shaft 5. Two valve seats 9 and 10 are arranged at the
outer ends of two bores 9a and 10a which are longi
Claims priority, application Great Britain Jan. 28, 1960
4 Claims. (Cl. 137—54)
tudinally spaced along the shaft and extend in diametri
This invention relates to speed-responsive spill-type 10 cally opposite directions from the central bore 8, and
each valve seat 9 and 10 is normally closed by a valve
?ow-control governors and is particularly, though not ex
clusively, applicable to fuel-control governors for an in
ternal combustion engine which in response to the speed
of the engine vary the amount of fuel delivered from a
positive-displacement fuel pump to the injection device 15
of the engine by opening a spill aperture when the speed
rises above a predetermined value.
A spill-type governor has previously been proposed in
which the governor shaft contains a bore communicating
with the delivery side of the fuel pump and having a
radial outlet which is controlled by a valve element which
rotates with the shaft about the axis of the shaft and
element 11 or 12 of hemispherical shape.
Each valve
element is mounted in a valve support member 13 or
14, and each support member is carried by a leaf spring
15 or 16 which extends longitudinally of the shaft and
is ?xed to a spring carrier 17 or 18. The spring carriers
17 and 18 are respectively mounted in direct diametric
opposition to the valve seats 10 and 9 so as to dynami
cally balance the masses of the valve seats and valve
elernent assemblies.
The spring 15 is stronger than the spring 16 so that
the valve 9, 11 will not open until the higher one of
two predetermined engine speeds, generally the normal
is resiliently held on its seat by a leaf spring extending
or the maximum running speed of the engine, is reached,
longitudinally of the shaft, the centrifugal action of the
valve element and its mounting producing the governor 25 while the valve assembly 10, 12 will open at a lower
predetermined speed, for example at the idling speed of
action by overcoming, at a predetermined speed, the
the engine to which the shaft 4 is coupled. The admis
action of the spring. In the previously proposed con
struction the governor shaft is constituted by one of the
sion of fuel from the bore 8 to the seat 16 of the last
shafts, or an extension of one of the shafts, of a gear
mentioned valve 10, 12 is controlled by a spring type
piston type slide valve 19 which operates in a wider
counter-bore part 8a of the bore 8, and which can,
type fuel pump.
The present invention has for an object to provide an
improved governor of this kind which when used as a
against the action of the pressure operating in bore 8a,
fuel governor of an internal-combustion engine, permits
either of two different predetermined engine speeds to be
be moved to cut off the bore 10a leading to seat 10 by
selectively maintained.
means of a speed-control lever 20, which acts on the
35 piston 19 through a pin 21. A spring 22, interposed be
tween the lever 20 and the pin 21, makes it possible,
by a suitable movement of the lever 20, to maintain the
According to the invention the governor shaft is pro
vided with two radial spill outlets each controlled by a
separate spring-loaded valve element which rotates with
the shaft about the axis of the shaft and is resiliently
held on its seat, the spring loading of the two valve ele
ments being respectively so arranged that the two valves
will respectively open at two predetermined speeds of
rotation of the shaft, and an externally operable valve
is provided, by which the spring-loaded valve opening
at the lower speed can be cut off from communication
valve 19 in an intermediate position in such manner as
to maintain a predetermined pressure drop at the inlet
to bore lila, according to the loading which is applied
to the spring 22.
When the valve 19 is closed, the governor valve 12
responsive to the lower one of the predetermined speeds is
ineffective for controlling the engine speed, allowing this
45 speed to rise well above that at which the valve element
12 will be lifted off the seat 10 even in the absence of
pressure in the seat. In order to avoid the risk of the
valve element 12 and its support moving under these cir
cumstances so far outwardly as to foul the housing 23 in
which the governor is enclosed, a stop member 24 is se
cured on the governor shaft 7, which limits the outward
movement of the spring 16. No such stop will generally
be required for the valve element 11 which opens at the
with the pump delivery, means being provided which
prevent the valve element responsive to the lower speed
from moving outwardly to an excessive extent when the
shaft runs at the higher speed for which the other valve
is set. Each valve spring is preferably a leaf spring ex
tending longitudinally of the shaft.
More than two
valves, each set for a di?erent speed, may be used, in
conjunction with means for successively rendering, when
required, all valves except that for the highest speed in
operative, on a single governor shaft if desired, more par
ticularly to allow more than two speeds of an internal
combustion engine to be selectively maintained within
narrow limits, but alternatively in an arrangement hav
ing only two valve elements responsive to different pre
determined speeds, intermediate speeds may be main
tained by placing the cut-off valve element in intermedi
ate positions in which the ?ow to the valve element re
55
highest engine speed, because its seat passage 9a always
communicates with the bore 8, and opening of valve 11
will therefore always be effective to prevent any rise of
engine speed beyond the range in which the pressure
acting in here 8 is required in addition to centrifugal ac
tion for opening valve 11 against the pressure of spring 15.
The fact that the slide-valve piston 19 is arranged co
axially in the rotary member carrying the governor valves
greatly reduces sealing di?‘iculties.
The apparatus illustrated may be modi?ed in various
The drawing accompanying the speci?cation is a sec 65 respects without exceeding the scope of the invention.
The piston-type slide valve 19 could, for example, be
tional elevation illustrating a fuel pump equipped with
replaced by a poppet-type valve.
a governor equipped for two preset speeds and em
Furthermore the governor arrangement described may
bOdying one form of the invention.
be used generally for the control of the flow of any liquid
Referring to the drawing, the governor is mounted on
a gear-type fuel pump having a housing 1 and pumping 70 or gaseous ?uid whenever one outlet is required to be
opened at one speed, and a second outlet is required to be
gears 2 and 3, one mounted on a drive shaft 4 coupled
opened at a higher speed, means being provided for se
to the engine to which the fuel is to be supplied and
sponsive to the lower speed is progressively throttled.
3,035,592
(1;.
lectively preventing the ?rst outlet from becoming effec
to an excessive extent when the shaft runs at the higher
tive. The rotation of the governor shaft may be derived
from an engine shaft ‘or from any variable-speed shaft.
Thus an additional advantageous use of the present in
vention is for the control of the combustion-air supply
to an internal-combustion engine.
What I claim is:
speed for which the other valve is set.
1. A speed-responsive spill-type ?ow~control governor,
2. A governor [as claimed in claim 1, wherein each
valve spring is a leaf spring extending longitudinally of
the shaft.
3. A governor as claimed in claim 1, comprising on a
single governor shaft more than two valves, each set for
a different speed, in conjunction with means for succes
which comprises a governor shaft provided with two
sively rendering inoperative, when required, all valves
radial spill outlets which communicate with a common 10 except that for the highest speed.
inlet for connection to the delivery port of a positive
4. A governor as claimed in claim 1, having only two
displacement pump, each spill outlet being controlled by
valve element's responsive to different predetermined
a separate spring-loaded valve element which rotates with
speeds, wherein means are provided for placing the cut
the shaft about the axis of the shaft and is resiliently held
oif valve element in intermediate positions in which the
on its seat, the spring loading of the two valve elements 15 flow to the valve element responsive to the lower speed
being respectively so arranged that the two valves will re
is progressively throttled.
spectively open at two predetermined speeds of rotation
of the shaft, ‘and an externally operable valve by which
References Cited in the ?le of this patent
the spring loaded valve opening at the lower one of said
UNITED STATES PATENTS
speeds can be cut o?? from communication with the 20
common inlet, and means limiting the outward movement
of the valve element responsive to the lower speed so that
such valve element is prevented ‘from moving outwardly
1,491,883
2,779,582
2,896,653
Priess _______________ __ Apr. 29, 1924
Hopper ______________ __ Jan. 29, 1957
Marlin ______________ __ July 28, 1959
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