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Патент USA US3048173

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Aug. 7, 1962
3,048,158
P. E. OLSON
I_.OW OIL PRESSURE PROTECTION APPARATUS
Filed Feb. 8, 1960
2 Sheets-Sheet l
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PAUL E. OLSON
2M im
Aug. 7, 1962
P. E. OLSON
3,048,158
LOW OIL PRESSURE PROTECTION APPARATUS
Filed Feb. 8, 1960
2 Sheets-Sheet 2
TO ENGINE
IGNITION CIRCUIT
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INVENTOR.
PAUL E. OLSON
TO I-:GINE
IGNITION CIRCUIT
AWÜHNE/
United States Patent Ü ” iQ@
l
3,048 158
LOW OIL PRESSURE PRÓTECTION APPARATUS
Paul E. Olson, Pittsburgh, Pa., assignor to Westinghouse
Air Brake Company, Wilmerding, Pa., a corporation of '
Pennsylvania
Filed Feb. 8, 1960, Ser. No. 7,399
8 Claims. (Cl. 12S-196)
3,043,158
Patented Aug. 7, 1962
2
low oil pressure condition in the oil lubrication system
of the compressor;
FIG. 3 is a View, partly in section and partly in outline,
showing apparatus diiiering from that shown in FIG. l,
in that certain parts are rearranged in a manner that a
fuel shut-off device is actuated to shut off fuel supply to\
the engine responsively to supply of pneumatic pressure l
thereto;
This inven-tion relates to low oil pressure protection ap
FIG. 4 is a fragmentary view of a modiñcation of the
paratus for machines such as compressors, motors, and 10 apparatus shown in FIG. 3 with -a pneumatic pressure
the like equipped with an oil lubrication system -and more
actuated switch device in the ignition circuit for the engine.
particularly to such apparatus especially adapted' for use
Description
with plunger-type pump pressure systems in which the
oil pressure iluctuates.
The embodiment of the invention, shown in FIG. l of
Various control devices have heretofore been provided 15 the drawings, comprises an accumulator 1, timing means
to detect low oil pressure in the lubrication system of an
2, a lcontrol valve device 3 and a shut-off device 4.
engine and to correspondingly control shutdown of the
engine. Such control devices7 however, are designed
For purposes of illustration, the apparatus is shown
associated with an engine-compressor unit of the type in
primarily for use with gear-type pump pressure arrange
-cludingan engine 5 driving a compressor 6 for supplying
>ments providing a substantially constant oil pressure in 20 compressed air via a pipe ’7 to a reservoir 8 provided
the lubrication system and are not suitable for use with
with a pipe 9 to which any pneumatically driven power
lubrication systems in which the oil pressure iluctuates
device (not sho-wn) may be connected. The engine yand
due to use of plunger or displacement type pumps.
the compressor each have separate and different oil lubri
The primary object of this invention is to provide im
cation systems and, for simplicity, the lubrication system
proved apparatus for controlling shutdown of an engine 25 for the engine, which is usually of the constant-pressure
responsively to a below-normal oil pressure condition in
gear pump type, is not shown, The oil lubrication sys
the engine lubrication system of the displacement type
tem for the compressor 6 includes an oil pump 10 of the
wherein the oil pressure is subject to fluctuations.
plunger type driven from the engine camshaft, and Ian
According to this object, one embodiment of the inven
oil line or pipe l1 leading, in customary manner, -from
tion comprises a pressure-responsive control valve device 30 the pump l0 to the cylinder bore 12 of the compressor.
subject to the oil pressure in an oil pressure lubrication
The accumulator 1 comprises a casing 13 having a
system of an air compressor, a pressure-actuated fuel con
chamber 14 therein in which there is disposed a ball check
trol valve controlled by the valve device for causing the
valve 15 seatable on a valve seat formed at one end of
fuel control valve to shut oif the fuel supply to a driving
a bore 16 open at its opposite end to oil pressure in pipe
engine for the compressor when the oil pressure in the 35 1»1 via a branch of pipe 11 and a port 17. A piston 18,
sealingly reciproc‘able within a bore 19, is subject et its
lubrication system reduces to a chosen low value below
normal pressure, and a timing device consisting of an ac
one side to oil pressure in chamber 14 and opposingly at
its opposite side to the force of a spring Z0, one end of
cumulator, connected to the valve device, a check valve
past which oil under pressure is supplied to the accumula
which is backed by a perforated screw plug 21 in the outer
40
end of bore 19. The perforations in plug 21 maintain
tor and a by-p'asswcholce for reverse ñow of oil under
pressure from the `accumulator on a selected time basis.
the chamber on this side of the piston vented to atmos
phere at all times.
The accumulator maintains oil pressure on the Valve de
vice, suílicient to maintain the fuel control valve open
>The timing means 2 -comprises a need-le valve 22 seal
during the intervals in which the oil pump does not apply
ingly screw-threaded into a bore 22a and adjustable to
pressure to the system, incidental to normal operation of 45 control reverse flow of oil through an orifice 23 from
chamber 14 -to bore 22a and thence via a passage 23a to
the pump.
port 17, in bypass of check valve 1S, lat a selected re
I-f the pump fails to `apply pressure to the system for a
stricted rate in accordance with the timing desired.
time longer than the selected ‘time established by the
Control valve device 3, hereinafter described in detail,
timing device, the back ñow of oil through the by-pass 50
is disclosed and claimed in copending application Serial
choke reduces the oil pressure acting on the valve device
No. 72,600, ñled November 30, 1960, by Charles Doolittle
to below the chosen low value, thus resulting in operation
and Arthur J. Bent, and assigned to the same assignee.
Control valve device 3 comprises a casing 24 having
of the engine.
a transverse slot 2S in which a lever 26 is fulcrumed,
Several other generally similar embodiments are dis 55 intermediate its ends, on a pin 27 for rockable move
of the fuel valve to its shut-oit position to cause stoppage
closed, in several of which the valve device controls a pres
sure actuated switch for interrupting the ignition circuit
of the driving engine if the oil pressure in the `lubrication
ment.
Lever 26 has suitably attached thereto a handle
_28 for manual rocking Iof the lever, said handle extending
upwardly through an opening 29 or slot in a casing cover
system reduces to a chosen low pressure.
30, suitably secured to casing 24, as by screws.
In the accompanying drawings, FIG. l is a sectional 60 A pair of pistons 31 and 32 ‘are sealingly reciprocable
View of the apparatus embodying the invention, shown
in respective spaced parallel bores 33 and 34 in the casing
associated with an engine-compressor unit, including a _ 24 in such a manner as to contact corresponding opposite
ends of `lever 26. Piston 31 is subject to oil pressure sup
fuel shut-oit1 valve `device normally supplied with
plied to ya chamber 35, formed in bore 33, from chamber
pneumatic pressure and eifective upon release of
65 14 of accumulator 1 via a passage 36 in casing 13 of the
pneumatic pressure therefrom 'to shut down the engine
accumulator, a port 37 of casing 24 and a passage 38.
responsively to an abnormally low oil pressure condition
Port 37 is threaded at its outer end to receive a threaded
in the oil lubrication system for the compressor;
boss of casing 13 to effect joinder of the casings 13 and
FIG. 2 is a fragmentary sectional view, showing -a modi
Piston 32 is subject to the force of a spring 39 co
ñed arrangement including a pneumatic pressure actuated 70 2.4.
axially disposed in a chamber 40 formed in bore '34.
switch for interrupting the ignition circuit of .the engine
and thus stopping the engine responsively to an abnormally
Spring 39 exerts a force corresponding to a selected low
oil press-ure substantially lower than the normal oil pres
'y
femelles
‘ ¿,
of device 3, to `the reservoir f8; when alhandle of valve 1 ' "
sure required in the lubrication system of »the cpzompressor‘1l e i
‘6.9 is moved tothe ‘fcnî’ 'positionfto control the-shutdown „
of the ‘engine-compressor from a remote location. e
1 to maintainproper lubrication of the components therein.` '
Pistons 31 and 32 act opposinglyto rock‘lever 26 iny
either a clockwise or a icountercloclrwise direction accord
kOperation
ing to whether the force of the oil pressurein chamber 35 'z
acting on piston 31 isy greater or less than the force of‘
.
y
y
it beassumed initially that
the ap
paretus of FIG.r l is conditioned with .ther vhandle of
spring» 39 acting against piston 32, respectively. f
ofhon valve y69 in “off” position, in which it is shown,
The foregoing structure including the,y pistons 31 and 32 .ç
for venting 'chamberr 40, that the needle valve '22 is ad
justed to permit la‘ desired nate of return ofk oil under
and the `lever '26 are hereinafter sometimes referred to as
the `actuator means.
p ïnjopera'tionp‘let
f
,
A valve 41 of the disc or poppet type is disposed in the ~ , Y `‘in‘essure'kffro‘m chamberl4 tojport'l’ï, and that the engine
ycompressor unit’ is shutV down. »In this case all ofthey
components of they apparatus will be in their respective
inner end of «a bore 42 in casing 2d and is `bias-ed by the
force of a coaxial spring 43, interposed between valvedî
~ y `
will be
and an end wall ofbore d2, toward and against an annular t vpositionsy showny in the drawing. » Chamber
valve seat 44 formed on Áa valve` seat member 45 in the l5. devoid of‘ioil under pressure yandlever 26 will be biased
form of a piston sealingly disposed in the Outer end of ¿ to its Acouriterclockwise limit position or engine cut-»oirr posi
tion in which, handle 2B is adjacent the left~hand end of t
bore 42. A plated@ suitably secured "to thefcasing wall,¿
¿slot 29 <in cover 30 andin which the left-handend ot
-as by a screw, serves to retain the membery 45k `ifi/the bore
42. Member 4S has a centralbore 47 therethrough of . y 'lever Zocontactsthe casing 24‘at the bottom »of 'slot 2.5; _ '
different diameters along'the length thereof, the' mouth f 20 "as viewed inthe drawing, andk stem 45s’ will be in itsy up- .l "
ward limit ‘position defined by the lip onthe free endet
of the bore 47 opening inside the valve seat ‘i5 «andthe
opposite end opening into slot 25.
ff
t
y
. ` stemÁSÃbeÍng/in spaced relation with valve v¿i1 .to permit
i
venting otchambe'rädof deviced via stern 43.k f
A hollow tubular exhaust Valve stem’dS isgpivotally
.,
.
connected’at its upper end by ra. pin to»r the ylever 26, „at
`a point intermediatepin 27 and piston 3‘2, andat its lower,
To start the engine, it is first »necessary to move handle
'2S ofr levergZtSL to its` clockwise limit' positionïor engine f
tact therewith. >Stern 48 is shifted downwardly by clocki
,ingly rocked `clockwise to its‘ìlimit position in which the
44 against the force of spring 43 and the pressure of Ífluid
. forcefof spring l39 `of device ySi. Valve ystem «d8 is thus "
i movedtdownwardlysuccessively from its uppermost posi->
or free end extends slidably throughan aligned aperture' s 4running. positionadjacent the right end of'slot ’2K9 of „
in plate 46 into bore 47 of seat >rnen'iher 45 in sealed'con-` ~ cover 30, in cpnsequence of ywhich lever 26 is correspond/ ‘
wise rocking movement of lever 2.6' to causethe freeend . ' ' right-*hand endÍ of-lever 26 contacts casing 2.4!» vat the bot- f
of stem ¿i8 to engage and to unseatvalvedl from‘f‘se'at 30 torn oîslïotpZS, as viewedin the drawing, against. the
acting :on valve 4l in a «chamber 49 open to reservoir 3
tion intoV engagement withvalve 41 »and thenkfurther down
àwardly ,to unseat valve 41 from seat 44 against theforce
yof‘springdíìfaïirl ythe/pressure yof' fluid Aacting on valve ¿il
under pressure iiows from Á chamber p49 .to ¿an yannular
recessorchamber 52, formed in the outer surface of valve j in chamber .49. l With valve -41 thus unseatemiìuid under.î
via a passage 50 and a pipe 51. `Cornmunication is estab- ‘ ‘i
lished past valve di, while thus unseated, viarwhich'liuid
», `pressure lflows from‘rchamber49 in device «3s to chamber n
seat member 45 via bore 47 and a plurality .of‘tran'sverse
, .
s . 5d> in shut~ofî~device 4îvia bore 47 in, member 45, passageu . Á ¿
ports 53 inseat member n45, Aand thencey to a chamber 54
\ Í~ ,Sóta?d pipe 57.L `Thepressureof iluid'in chamber 54 of" i
within a casing 5S of `shut-'off device '4 viaïa passage
device 4„act`sagxainst diaphragm ‘60r tof`unseat.„\`falve e3. i. L
With valveßóßunseated, from seat 63 communication is
anda pipe 57; Counterclockwise rocking movement of
»f lever 26 moves stem 48 upwardly to a poSîîiOu, in which
may
kfkfoín`
,` y y
it is shown, wherein thefree end ofstemdß is raised` out ,. Wesilîlbillsi'led. lthl'çllgh`
of ycontact with valve 41` and wherein valve 41' is ,biasedÍ ,i . `ddfto
engine.ychamber
. ïWhi'le holding
,66 ‘and`
thethence-to
handle 2S pipe
in its‘clockwise'
¿67 „and tor‘the
limit `
into engagement with seat 44 by spring d3.;r ‘ ‘In the latter
position of stem `48,..iiow of lluid underpressure from
áâfposition, thegeng-ine Sean thus‘be started by` the usual
chamber 49 ofy device 3` lto chamberf‘ëd‘of device` 4 is cutv
,f
ofir and chamber 5d of ydevice 4 is ,vented `to yatmosphere
via the «bore in stem '48.
~
'
A cylindrical plug S8 issealingly dispos-ed`
a bore <59 y i
Ácorresponding in dimensions tobore 42 vand open to the
same passages 5l) «and 56. . ~ Bore 59 is provided to permity i
engine,startingfprocedure.
IAs soon y‘as ,th ' " engine
.
`
'
'
5` starts, `pump `10 rforces oil
.lunderlpressure into the‘lubrication system andr into portw »f
17 of device 1, via pipe 11,` thence past 'check valve 15 ~
' into chamber` y14'y of the accumulator. Oil pressure in y
`charnlmerld actsagainst piston 18 to compress springîß»
. .i
interchange with plug», 5810i? valve seatr member 45, yvalve . @an amount .corres'pcndixflg` to theloil pressure establishedr . Y
d1 »and spring 43 when itis desired to use `a'modiiied form'y ,. 'Í invncharnber 14; `.„ Oilunder pressure` from chamber 1.4.# ,
of shut-oí device` as will be explained slater. . Plate` ‘4'5 .
«also serves to holdV plug 58 within bore S9. . f . »
f ftiows, `tocharnber35 ‘of devicefS via. passageïâ?, port '37r . A ,s
andfpassageß?otvdevice 3 andacts against pistonßil-
` . ablyclamped
The shut-oñ~device
between sections
4 `comprises
`of casingwSSiand‘
a» diaphragm.subject
(geuitL
:at ,
y its one side to the pressure of iiuid in‘chamberÁ 5,4 and
opposingly to the force of a coaxial spring `61 disposed _
" `Í3S acting onl’piston 31 increases‘toá'a valuehighe‘r thanff
kthe cumulative `forces of »spring 139 acting on piston 32.;
in Áan atmospheric chamber at itsother side. p, YA‘follower 6.0i of spring dâyacting on valve 41,y and the‘force corre- «Y
spendingk to ,the’pressure'of‘ñuid in chamber 49 acting
associated with diaphragmói) has ka valve stem 62~extend-fl
ing therefrom and stem 62 has a poppet valve „63 formed
¿on valve ‘41, 'so as `to keep the lever .26 rocked in its` t ’ .
atits end. Valve‘ôâ controls the ,supplyiof fuel from a`
„clockwise/limit, positionr‘without the aidof manual force'` „ .e i p» i
ofthe handles`r ltfwill thus »betapparent thatthe ¿engin
A chamber `ed, open via a port iii/casing 55 tolanengine‘ffuel
supply line Á65k connected to. a `fuel@
pfnotíshoxvnkf t ~
Wl.
Í chamber o6 wbiehïís always-opendoen engineîueltinlet
maintained in
port 'via `a pipe `6K7.' `When chamber 54‘ of device" .1i-f l u
f i vented,
with -a valve
valveseat
63 ’68
isbiasedf
formed-by,a-tspring*
`oneendrof
61 intofengagefrnent
a‘port’through... t
"
i
`
.
`
`unas»ilnrrgl »asç‘aïznorrnal `oilJpressune'” is f1
«lubrication '1 system. „and s ¿the . ` lever
'isflreptroclredmits'cockwiseliniit position.~ L"
.
pistonïßßf
y‘lt?yyz llbequnderstooti;
me accumulator
tha‘tthetoree
1 Ãcontinuesito'ei'rert
Aci springgîûi
normal
`ronf"`i. .
a partition wall between ehambers‘tód-»and ‘dotto cut yolf` 70 pressure ontheoil'in chamber 14 andk thus the `oil pres#
surey in chamber' 3S continues to exert sutñcient» force to
the ilow of fuel from ‘chamber 64 to chamber 66' and
thereby to the engine.
"
'
Remote enginey cnt-out control is! provided by
Írhold lever~26fin its -clockwise' limit position Anctwithl`
oiî-n l y standing
cation» 'syst
momentary'
"
pressure rareíaotionsin
'
the lubri~L ~
onr valve 69, interposed'in fa/branchoff pipe 551, ’fon con- ff
necting chamber 40 of deviceßrviaia passage 791ifc'asiugïß;
ernlfduring the: intake ‘stroke’ `ofthe ‘deplace '
e
`
‘
'
ließe
“
5
e
that the restricted backiiow of oil under pressure via
orifice '23 from chamber 14 to pipe 11, while the pres
sure rarefaction occurs, is not of suiiicient volume to
a piston 73 sealingly reciprocable within a bore in a
‘ casing and subject at one side to pressure of fluid in a
etïect a reduction of the mean 4oil pressure acting on
piston 35 to permit reverse tilting of the lever 26 in a
counterclockwise direction.
As a matter of fact, the orifice 23 so restricts backñow
of oil under pressure that a selected number of seconds,
such as thirty, must elapse before the oil pressure in
chamber `14 and thus in chamber 35 reduces sufficiently 10
to allow reverse tilting of lever 26. Thus as long as the
pump 10 continues to operate properly, the momentary
pressure rarefaction in the lubrication system incidental
to the intake stroke of the pump piston does not affect
the position of the lever 26.
However, if for some reason the pump 10` ceases to
operate to maintain normal oil pressure in the lubrication
system, the oil pressure in >chamber 14 and thus in cham
ber 35«will be reduced after a given interval of time,
such as thirty seconds, due 'to backiiow of oil through
the orifice 23 to the pipe 11. In such case, when the oil
pressure in chamber 35 decreases to a value below that
chamber 74 open to pipe 57 and at its opposite side
opposingly to the force of a spring 75 disposed in an
atmospheric chamber. A stem on piston 73 has an in
sulated contact member 76 for engaging a pair of sta
tionary contact members to close the ignition circuit of
the engine.
ì
In the operation of the apparatus ot FIG. 2, when oil
pressure in the lubrication system of the engine is normal
and correspondingly lever 26 is rocked to its clockwise
limit position, pipe 57 will be charged as previously ex
plained, and pressure of ñuid from pipe 57 will flow to
the pneumatic switch 72 to move piston 73 downwardly
against the force of spring 75 thus causing Contact mem
ber ‘76 to close the engine ignition circuit t0 permit oper- v
ation of the engine. When the oil pressure in the lubri
cation system reduces abnormally, pipe 57 will be vented
as previously described and spring 75 will bias piston 73
upwardly to thereby carry contact member 76 upwardly
thereby to open the ignition circuit of the engine for
elïecting shutdown of the engine.
In FIG. 3, another modified shut-oft device 77 is shown
corresponding to the 4force of spring 39, lever 26 will be
rocked to its counterclockwise limit position, as previous
connected to valve device 3. Device 77 comprises a cas
ly defined, carrying stem 48 out of engagement with valve 25 ing having therein a movable abutment, such as a dia
41 and allowing valve 41 to seat on valve seat 44. `~ Cham
phragm 78, subject at one side thereof fto pressure of fluid
ber 54 of device 4 will thus be vented via pipe 57, pas
in a chamber 79 open to pipe 57 and opposingly to the
sage 56, bore 47 and stem 48. When chamber S4 is
force of a spring S0 in an «atmospheric chamber at its op
vented, spring 61 of device 4 will bias the diaphragm 60
posite side. A stem, having 4a valve S1 at one end, is op
`to its upper limit position deñned by a stop 71 in the 30 eratively connected to the diaphragm '7S 4at its opposite
casing 55 wall. Va-lve 63 of device 4 will be corre
end, said valve 81 being unseatable from a valve seat 82
spondingly carried upward into seating engagement with
to control supply of fuel from a chamber 83, open to la
valve seat 68 and will be effective to cut ofr’ the flow of
fuel ,tank (not shown) via pipe` 65, to the >engine via
fuel to the engine and consequently cause the engine
pipe 67.
35
compressor to shut down.
Device 77 is operable in a reverse manner from device
lf desired, the engine may be cut out from a remote
4 shown in FIG. 1 in that when chamber 79, which cor
location by moving the handle of the olf-on valve 69 to
responds to chamber 54 of device 4, is pressurized, valve
its “on’f position, as previously described. In this event,
81 cuits oft the flow of fuel to the engine whereas, as al
ñuid under pressure will flow from the reservoir 8 past
ready explained, when chamber 54 of device 4 was
valve 69 to chamber 40` of device 3, and will act on 40 charged with fluid under pressure, vfuel was supplied to
the inner face of piston 32 to cause the piston, in con
the engine.
junction with the force applied by spring 39` in bore 34,
p In `order to adjust valve device 3 to charge chamber
to exert a force on lever 26 which, assuming the engine
79 of device 77 with fluid under pressure instead of vent
is running, is positioned in its engine running or clock
ing it so as to effect shutdown of the engine 5 when the
wise limit position. The unit iiuid pressure supplied to gni c: oil pressure in the lubrication system of the compressor 6
chamber 4t) is of a value higher than the value of the
decreases yto an abnormal pressure, it is only necessary
normal oil pressure in the lubrication system and conse
to interchange valve member 45, valve 41 and spring 43
quently a counterclockwise moment is exerted on lever
with plug 58 and to pivotally connect stem 43 to :lever 26
26 which then transmits a back pressure to the oil in
intermediate piston 31 and pin 27, as shown in FlG. 3.
chambers 35 and 14 via piston 31. Check valve 15 thus 50 With these components rearranged the operation of de
seats and oil under pressure trapped in chamber *14
vice 3 `is the same as that `described for FIG. l with this
escapes therefrom at a restricted rate past the needle
exception, that when lever 26 is rocked to its counterclock
valve 22. The combined force of the pressure of fluid
wise llimit position as when the oil pressure yin the lubrica
under pressure in chamber 40 and of spring 39 exerted
tion system is abnormally 210W, stem 4S will be in its
on lever 26 will act to push piston 31 down into bore 33
downward limit position thereby unseating valve 41.
displacing oil from chamber 35 into chamber 14 of the
Chamber 79 of device 77 will thus be charged and the
accumulator 1 to shift piston 18 in the ‘accumulator up
pressure of flu-id therein will cause diaphragm 7% and valve
ward against the force of spring 20. While the lever 26
71 of device 77 to move downwardly for seating valve
is rocked counterclockwise to its limit position, the stem
81 on seat 82 .thus cutting oil flow of fuel to the engine;
43 will be shifted upward, valve 41 will be seated and 60 and when lever Z6 is rocked to its clockwise limit posi
chamber 54- of shut-oí device 4 will be vented via stem
tion, as when the oil pressure in the lubrication system
48 in the manner described, cutting out operation of the
is normal, then lever 26 will carry stern 4S upward out
engine. It will be noted that the value of spring 20 is
of `engagement with valve 41, whereby valve 41 will cut
such that when chamber 14 is charged with oil at a
olf ‘the flow `of fluid to chamber '79 and the latter chamber
normal pressure, spring 26 will not be fully compressed 65 will be vented via :stem 48 to cause valve S1 to be un
by piston 18. '
.
seated for opening the fuel supply line to the engine.
FIGS. 2, 3 and 4 show modified embodiments of the
FIG. 4 shows a modified shut-off device S4, such as a
apparatus. The same numerals used in FIG. 1 to identify
pneumatic control switch, substituted for device 77 of
the various components of the apparatus will hereafter
FlG. 3. Device 84 comprises a piston 85 sealingly re
be used to identify like components.
70 ciprocable within a bore in a casing and subject at one
ln Fl'G. 2, a modiñed shut-oit device 72, shown as a
pneumatic control switch, is provided in the ignition
side to pressure of fluid in a chamber 86 open to pipe 57
and at its opposite side opposingly to the force of a spring
circuit oi the engine for controlling shutdown of the
S7 disposed in an atmospheric chamber. A stem on pis
engine 5 upon abnormally «low oil pressure in the lubri
ton 85 has an insulated contact member 88 for engaging
cation system of the compressor 6. Device 72 comprises 75 a pair of stationary Contact members when the piston is
acte, les
g f
biased to an upper position byispring S7.' With this ~ ari-i.
`,chosen low value only after the expiration of a certain ' ï
rangement of the apparatus, in operation, chamber 86st ‘
selected lengthjof time.
device 84' will be charged when «the pressure-inthe lubri-U
’ 4.y Low-oil pressure protection apparatus, as `claimed in , ~ , 'i '
clainrlï,r further including` casing means by kwhich said'
` ,26
cationfs'ystem
is ¿correspondingly
of the engine'isabnormally¿low¿and"lever`
rocked to -its counterclockwise ’po- , f
control valve means land said «actuator means are.’ 'sup
sition as previously explained, and the ypressure of fluid
f ported, and characteiizedtin «that said control ,valve means f
" is selectably 'locatable in either one of a pair oi' spacedy
`acting on piston 85 will move the ypiston `and contact mem
kber ‘53, operatively connected lthereto, downwardly'to dis- s \ bores `in saidïcasingimeans, according to whether pressure y
of fluid to be supplied to or exhausted fromsaid shut
engage the 'contact member 8S from the stationary con'
„ tact members in the ignition circuit for opening ,the cir 1o oiî'means «by» saidy :control valve means to eiîect shutdown
cuit and thereby shutting down the engine; when'charnber f ` of the'engine..
86 is vented in the manner' described for FIG. ¿thenv f r` ‘ `5. Lowl oil pressure protection apparatus as claimed ,in
r`claim 1,r further ‘ includingA and characterized by casing
spring' 87 of device 84 will bias piston 3S land contact
means on which said control valve means and saidactua
member 88 upwardly to‘cause member 3S to engage the
tor means are supported and in which there arcy a pair of
stationary contact members for closing the engine igni
. «tion circuit to permit operation of the engine».
.
~
» yspaced bores of identical diameter, and a sealing plug' dis-; ` "
posed Vinione ,lof’tsaid bores, said valvey 'means beingdis
yposed ini the `otherrd said bores` and?operatively con
nected to said actuator means, said bores being of identi
cal diameter so that said valve means’and sealing plug are
rectly to port 57 of device 3, provided `a constant pressure
interchangeable therein according to whe-ther pressure of
type of pump is employed for the lubrication sys-tem. , In f
Qñuid is to be supplied to or exhausted from said shut-oitV
‘y this case, oil under pressure from pipe ll will be eftec'tive
lt will be noted that, ‘if 'thetiming feature is 4`not de
sired, the apparatus'may be operated without the accumu-`
lator and the timing means, as by connecting pipe ,11 di
~ in chamber 35 of device 3, when` the `engine is operating,
means by said'eontrol valve means to eiîect shutdown of y y .
to rock lever 2.6 clockwise toits fuel line opening positiony t f
or ignition circuit closing position. Upon areduction or”
6.k A ylowoil pressure protection apparatus `for use with
oil pressure in the oil lubrication system from thes'higher
aup‘oil lubrication system oían engine-driven machine, 4'
normalpressure to below a value corresponding fsubstan- g / said apparatus comprising a source ot fluid under pressure,
tially to the value olf-spring 39,.,lever 2d willH be rocked f V"tiuid pressure ~ actuated;shut-.off` means operative in a nor.
counterclockwisev by spring 39 tofshut oft the engine.
' mal position'permitting operation `ot the engine upon' sup- ’
ply of iiuid under pressure thereto and operative at `a shut
Having now described the invention, what I claim as
oñ‘ `positionr to eiîect stopping of the engine upon venting f l
new and desire to secure by Letters <Patent, is:
1. Low oil pressure/protection apparatus for ¿anoiln lub;->`
rication system «of
,of fluid underwpressure therefrom, arvyalve means having a` '
supply position" `for supplying ’huidr under pressure to said
engine-driven m-ac‘hineÈwhen the oil f ‘ “
pressure‘in Ithe system decreases from a normal pressure to
shut-off means and an exhaust position for venting fluid ’
below a chosen low value, said `apparatus comprising a 35 under pressure from said shut-off' means, actuator means
for rsaid valvey means including means operatlvely con
source of fluid under pressure, a iluid pressure controlled
shut-oft means yfor effecting stopping of the engine, valve „ nected to and communicating with ysaid lubrication system Í'
so as to be responsive to a force corresponding to the oil
means for controlling the supply of liuid under pressure
pressure therein 'and means-for applying opposingly to
from said source to andlrelease of Áfluid under pressure
from said shut-otr" means, `actuating means tor said valve to said oilpressure -force a biasing force corresponding to a
means including means operatively connected to and com
chosen low value below a cert-ain normal oil pressure,.said
municating with said lubrication system so as to be re- `V
oil ypressure responsive means and said biasing force
means being 4operative to movesaid actuating means for
sponsive to a torce corresponding to said oil pressure ink
said lubrication system Iand means for applying opposing
>ly tosaid oil pressure force a biasing force corresponding
to the said predetermined chosen ylow value of oil pres
sure, said `oil pressure responsive means 'and said prede
, actuating said valve meansto said supply position when
the oi-l pressure in the lubrication system increases above
said chosen low value of oil pressure land for actuating
said Valve means to said exhaust position when the yoil
- termined biasing forcey means being operative to actuate
pressurek in said lubrication system decreases from said
`'norm/al position below said chosen low value kof oil pres
said valve means for controlling the supply off‘ñuid un- .
der pressure to and release vof iluid under pressure from` ' sure, .and timing .means between said lubrication systeml
, and said actuating means for delaying fora selected inter- l
said shut-ott means so as to eiîect stopping of said en
creases from said normal pressure to below said chosen
val `ottime the actuating of said valve means when rsaid
oil pressure ¿in said system decreases below said chosen
low value, and timing means lbetween said lubrication
low value of oil pressure.
gine when said oil pressure in said lubrication system de
~
`
'
system and said actuating means for delaying tor a se 55 ,7. A low oil pressure protection apparatus for use
with fan oil lubrication system of an engine-driven ma
lected interval of time the actuation of said valve. means
chine, said yapparatus comprising a source of fluid under
when said oil pressure in said system decreases below
pressure, iiuid pressure actuated shut-oft means operative
said chosen low value of oil pressure.
'
in a normal position permitting `operation of the engine f
2. Low oil pressure `protection apparatus, as claimed
in claim 1, in which said timing means comprises means ,n 60 upon venting of fluid under pressure therefrom uud‘opera
tive to la shut-oir position to effect stopping of the engine .
for preventing reduction of the oil pressure acting on said
upon supply of liuid pressure thereto, »a valve means hav
actuator means except tat a selected restricted rate, there
ing a supply position for supplying fluid under pressure to
by to delay operation of the said control valve means to
said shut-off means and au exhaust position for venting
eiîect operation of the shut-off means to stop the engine
f for a selected interval of time after reduction of oil pres'
sure in the lubrication system is initiated.
3. Low oil pressure protection apparatus, ask claimed
in claim l, in which said timing means comprises a check
Valve past which oil under presusre is supplied to said
65
huid/'under fpressure‘from said shut-oit` means, actuating
means for actuating `said valve means to one of said posi
, tions including `means Yoperatively connected to yandicorn
municatiug with said lubrication system so as to be re
sponsive to a force corresponding to the-oil pressure
actuator means,kk a pressure accumulator -forsmaintaining 70 `therein and means for applying a biasing force corre
sponding to a chosen low value below a cert-ain normal oil
oil pressure «on said actuator means during rarefjaotions f
of pressure inthe lubrication system, :and `a restricted ori- .
pressure/arranged opposingly to said yoil pressure'respon
iice via which loil under pressure Hows back to the lubrica
tion system at `a rate such that the oil pressure on said
sive means, said oil pressure responsive means and said
biasing force means being operative to actuate said valve
actuator reduces from said normal pressure to` below said
means to its supply position when'the oil pressure in the
f `
3,0 es, 15e
9
l@
lubrication system decreases below said chosen low value
respective spaced bores in said casing means and ecn
tacting said lever at points on opposite sides of said ful
crum, one of said pistons being subject to the pressure of
oil in the lubrication system and the other of said pistons
being subject to a predetermined bias force thereby sub
jeoting said lever to opposing moment forces for rocking
said lever 4on said fulerum to different positions thereby
to actuate said valve means for supplying pneumatic pres
sure to »and for releasing pneumatic pressure from said
of oil pressure and to actuate said valve means to its eX
haust position when the oil pressure in the lubrication sys
tem increases `above said chosen low value of oil pressure,
and timing means between said lubrication system and
said actuating means for delaying for a selected interval
of ltime the actuation of said valve means when said oil
pressure decreases below said chosen low value of oil
pressure.
8. Low oil pressure protection `apparatus for an oil
lubrication system of an engine driven machine, said ap~
paratus comprising la source of pneumatic pressure, a
pneumatic pressure controlled shut-oit” means for effecting
stopping of the engine upon decrease of oil pressure from
a normal pressure to below a chosen low value, `a con
trol Valve device `comprising a casing, valve means in said
casing for controlling the supply of pneumatic pressure to
and release of pneumatic pressure from said shut-‘ott
means, actuating means for said valve means, said actuat
ing means comprising ‘a valve actuating lever, a fulcrurn 20
pivotally mounting said lever intermediate its ends on
said casing, and a pair of pistons each reeiproea‘ole in
shut-oilc means so ‘as to effect stopping of the engine when
the oil pressure in said system falls below said chosen
low value of oil pressure.
References Cited in the ñle of this patent
UNITED STATES PATENTS
899,263
1,896,459
2,112,664
2,497,695
2,768,708
Richards ____________ __ Sept. 22,
Mullin ______________ __ Feb. 7,
Dube ______________ -_ Mar. 29,
Sheppard ____________ __ Feb. 14,
Cooper ______________ __ Oct. 30,
1968
1933
1938
1950
1956
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