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Патент USA US2407178

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. Sept. 3, 1946. ~
`
' D. G. Roos
_2,407,178
cnANKcAsE VENTILATION SYSTEM Ann APPARATUS
Filed oet’. 15', 1945
2 sheets-sheet '1f
__
D. G. Roos
cRANKcAsE vENT1LAT1oN"~VsY-sTEM AND
Filed om.> 15, i943
2,407,178
APPARATUS
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IN VEN TOR.
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Patented Sept. 3, 1‘946
2,407,178
UNITEDv STATES 4PATENT OFFICE
CRANKCASE‘ VENTILATION SYSTEM AND
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APPARATUS
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Delmar G. Roos, Toledo, Ohio, assignor to Willys
Overland Motors, Inc.,¿To_ledo, Ohio, a corpo
ration of Delaware
‘Application October 15, 1943, Serial No. 4506,453
3 Claims. (C1. 123%11‘9)
l
2
'I'his invention relates to a system and appara
tus‘for circulating a current of air through a
Figurei 1 is an end elevational view of an inter
nal combustion engine, parts being shown in sec
tion illustrating the system and apparatus of my
crankcase of an‘internal combustion engine espe
cially for the purpose of’removing vapors and
gases from the crankcase and valve _mechanism
chamber of the engine'.A l
i
invention;
1
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Figure 2 is a top plan view of the engine and
associated apparatus shown in Figure 1;
ï
The invention ccmprehends a system and ap
paratus for ‘continuously‘removing vapors from
‘ Figure 3 is a view taken substantially‘on the
line 3.-’-3 of Figure 2 `with the air cleaning ar
the crankcase `during engine operation whereby
rangement shown partially in section;
oil contamination- by dilution as well as by sludge 10 "Figure 4 is an enlargeddetailed sectional view
formation due to oxidation is materially reduced.
taken substantially on the line,- d--II of Figure l;
- One of `the principal objectsof the invention
Figure ‘5 is a ‘detailed sectional View taken sub
is the provision of means-‘interealated with the
air cleaner and conduit for conveying air to the
stantially on the line 5-5 of Figure 2.
,
While I have illustrated a form of my inven
carburetor as to divert a portion of the air -from 15 tion as‘incorporated in a multi cylinder engine
the air cleaner through‘the crankcase and valve
of alcharacter usable in an automotive vehicle,
push rod chamber,` so that clean air flows through
it is to be understood that I contemplate the
the crankcase and valve push rod chamber.
utilization of my invention with any type of en
Another object of the invention `resides in the
gine wherein the same may be found to have
provision of a systemand- apparatus for circu 20 utility.
lating acurrent of clean air` through the crank
Referring to the drawings in detail, I have il
case and whereby. the air passing through' the
lustrated a` conventional type of internal com
crankcase‘and valve push -rod compartment- is
bustion engine inclusive of a erankcase I0 mount
discharged into the intake manifold ofthe inter
ed up'on suitable support I I one or more cylinders
nal combustion engine.` c
.
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I2, each cylinder accommodating- areciprocating
~ Another object of the invention is the provision
piston I3 connected by means of a connecting rod
of a crankcase Ventilating system whereby a` por
I4 to a crankshaft I5, the latter being journaled
for rotation in suitable bearings carried bythe
crankcase Il);` The lower portion of the crank
tionjof the clean air which would otherwise nor
mallyapass `through thefcarbu'reto'r is diverted
throughy ‘the engine crankcase and `incorporating
case is closed by means of an oil pan or reservoir
means for varying the rate of flow of'air through
I6. 'I'he upper portion of the crankcase is formed
with a valve push rod chamber I1, the valve push
rodsï|8 being arranged-in bearings I9 and are
actuated by suitable camshaft 2U. The chamber
the crankcase dependent upon the speed ofthe
engine.
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Another object of the invention is thev provision
of‘means for circulating a current of clean air w ,vi -I'I is provided in its side wall with opening 2|
throughthe crankcase of an internal combustion
which is covered by means of a closure or fitting
engine which arrangement may be adapted to ex
l22 held in place by a bolt 23. The valve push rod
isting engine types without the necessity of mate
chamber I'I is in communication with the crank
rial alterations being made in the engine struc
ture.
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Still a further object of the invention is the
Aprovision of a system of circulating air through
a crankcaseì-«whereby the circulating air and en
trained vapors" are discharged into the intake
manifold of the engine.
VÍ
Further objects and advantages are within the
scope of this invention such as relate to the ar
case by means of a passageway 25.
40
Secured to the engine block is an intake mani
fold 21 which is connected to a fuel and air mix
ing device or carburetor 28 for supplying a com
bustible mixture to the engine, the latter being
provided with a conventional exhaust manifold
(not shown). Connected to the carburetor 28 is
an air horn 30 which communicates with an air
cleaner 3| by means of a duct or conduit 32 se
rangementoperation and function of the related
cured to the air horn by means of a clamp 33,
elements‘ofV the structure, to various details of
the other end of the tube 32 being connected to
construction and to combinations of parts, ele 50 «the air cleaner-'by means of a flexible conduit or
Aments per se;
and to economies of manufacture
and numerous other features as will be apparent
>from a consideration of the'specification `and
. l awings -of a form of the invention, which may
.be preferred, in. which: 1 ‘
tube 34.
The air cleaner 3l is inclusive of a sub
stantially cylindrical chamber which is closed at
its lower end by means of a cup-like member 31
which is adapted to containa small quantity of
' liquid 38 as for example, oil. or 'the like, to trap
2,407,178
3
particles removed from the air entering the
cleaner. The member 31 is retained in position
by clamping means 36. The upper portion of the
cleaner is provided with a series of louvered in
lets 33 to facilitate the ingress of air into the
interior of the cleaner. The air cleaner struc
ture is provided with projections’40 which engage
brackets 4l secured to the dash board 42 or other
suitable portion of the vehicle, the projections 40
being secured to brackets 4I by means of Wing
nuts 43 or other suitable retaining means.
Vertically arranged With respect to the engine
block and projecting into th'e crankcase I6 is an
oil ñller tube 45 preferably‘fabricatedçof sheet
metal tubing. The upper portionof the tube 45 is
provided with a ñtting 46 of flared or frusto
conical configuration to facilitate'the'introduc
4
The operation of the arrangement of my inven
tion is as follows: During operation of the internal
combustion engine, air is admitted through the
air cleaner 3 I, conduit 32, air horn 36 into the car
buretor 26 where thev air is mixed With combustible
fuel, the mixture passing through the intake man
ifold .21 into the engine cylinders. Under the
influence of sub-atmospheric or reducedpressure
existing in the intake manifold during engine
operation, a portion of the air entering the cleaner
3| is l diverted through the branch passageway
nor Vduct formed by tubes 5I, 52 and 53 into the
oil filler tube 45, the air passing into the crank
4case ||| through‘passageway 25, valve push rod
compartment; |-1,"thence- through fitting 56, tube
51, lfitting 58, member 60 and sleeve 62 into the
inta-ke manifold ofthe engine and below the car
buretor 28. When the engine is operating at com
tion of lubricant or oil into the engine crankcase.
paratively slow speed, that is, when the sub-at
The fitting 46 is tightly closed by means of acap`
41 through the medium of a sealing gasket 44 20 mospheric pressure in the intake manifold is only
slightly less than atmospheric pressure, theA valve
urged into sealing position under'. the influence
member 66 is inthe position showninI Figure 4,
of a spring '50, as particularly‘shown in Figure ‘5.
the air circulatingthrough theacrankcase'pass
Secured to the cap 41 isa -rod 46 which extends
ing from chamber 61 through the openin'gslßdand
downwardly through the tube 45 into theoil pan
I6 and provides a means for. measuring or'deter 25 past the valve seat 12 into the intakefmanifold as
well as through the metered passagewayôß. When
mining the'oil level in the oil pan i6. rJî‘he cap 41
the engine .speed increases., .the ypressure in the
is provided exteriorly with a member 48a`>having
intake .manifoldis further ‘reducedtcreating .a
upturned ear portions 49 ‘affordingfa manipulat
higher vacuum therein. The. air pressure> in the
ing means for removing the oil ñller `cap! 41, when
it4 becomes necessary lto introduce lubricant. into so crankcase and valve .chamberl 65.bein'g:substantiallfy greater than> thepressure in fthe intake
the filler tube. It is `desirable that the entrance
manifold, overcomes the ypressure of the spring
to the ñller tube be' tightly closed in order that `all
10 and causes the valve 66 to move ina leftrhand
air taken into the crankcase for ventilatlon'pur»
direction until the tapered‘seat 12 engages the
poses be admitted through’the ’air cleaner 3 l .
The conduit `32 is provided with a branch pas- y.
sageway 5| vand the ñaredîñtting 46 of the oil
filler system is provided with a laterallybextending
tube or passageway 52 which'are joined together
abutment 13, so that the »only air ' passageway
through the valve is by ‘means of themetered
opening or pasasge 68. With the valve in `closed
position, the rate of `flow vof ‘air through Athe pas
sage 68 may be comparatively high with' increased
by means of a flexible’tube 53’ heldin place by
clamps 54. The tubes or passageways 5I, 52 and 40 engine speed, but the kamount 'of air :circulating
through the crankcase will remain within prac
53 form an air passage or ductv from the'conduit
tical limits, although variable,‘as itis dependent
32 to the oil ñller tube 45 thus providing ameans
upon the‘engine'speed` and the position-'of `the
for diverting a portion of the> air taken in through
valve
member 66. In thispmanner'the circula
the air cleaner 3| into the oil filler tube 45> thence
tion of air through the crankcase isy controlled or
into the crankcase I5.
regulated so that at high enginezspeedsithe cir
The fitting 22` closing the opening `2|! in the
culation 'of air is not'increased to a'point which
wall of the valve push rod chamberisprovided
would carry out oil from the crankcase. It should
with an L-shaped fitting 56 to which connected
'also be noted that all of the air circulating
a tube 51 leading to another L-shaped f1tting58
which has'a threaded tenon portion 56 engaging 50 through the crankcase together with the fumes
andother vaporsentrainedby theainare dis
in a threaded opening in a member 66. The-mem
charged into theuintakemanifold and into the
ber 60 is formed with atenon .6| which ,engages
engine, being subsequently discharged through
in an interior threaded portionina sleeve 62,
the engine >exhaust » system.
vthe latter having a `portion 63 `engaging in a
.It is apparentfthat, within therscope of the in
threaded opening in a wall of the intake -manifold
vention, modifications and ydifferent arrange
21. The sleeve 62 is'formed interiorly withvalve
ments may be made other'than is herein .dis
chamber 65 in which is positioned .a‘reciprocable
closed, and the present disclosure is illustrative
valve or airflow regulating member 66. The valve
merely, the invention comprehending `all varia
member 66 is provided with a chamberl 61 which
communicates with the intake manifold through a 60 tions thereof.
What I claim is:
passageway or metered opening 68. The walls of
l. In combination, -an. arrangement for venti
the chamber 61 are formed with transversely
lating the crankcase of an internal combustion
arranged passageways 69 which open into the
engine havingv an intake manifold anda plural
chamber 65. The valve'member 66 is normally
ity of cylinders in line and an adjacent valve
urged into engagement with the endA of thetenon
chamber, a carburetor, an oil> filler tube extend
6| underthe influence of 4an expansive coil spring
ing into said crankcase substantially below'the
16. The valve member 66 is formed with a frusto
lower end and opposite the valve chamber vand
conical wall portion 12 which is adapted toseat
projecting above the engine; an air cleaner, an
against a shoulder Aor abutment 13 formed in
the interior passageway in the tenon portion 63 of
sleeve 62. ‘When the valve member 66 moves in
a left-hand >direction asviewed in Figure‘l, the
vtapered seat 12 engages the abutment 13 so‘that
mthereafter air may only circulate through the
metered passageway 68;
air conduit connectedto said carbureton'means
connecting said air cleaner and'said'air -conduit,
a closure for sealing the upper end of said filler
tube, means establishing communication between
>theupperportion of said ñllerltube and sai‘d'air
conduit, and means includingfa connectionbe
2,407,178
tween the valve chamber and the intake mani
fold whereby the reduced pressure in said intake
the valve chamber and intake manifold, said
` valve means being dependent for actuation upon
2. In combination, an arrangement for venti
lating the crankcase of an internal combustion
the amplitude of subatmospheric pressure in the
intake manifold for regulating the amount of
air flowing through the crankcase.
3. In combination, an internal combustion en
gine having a series of vertical cylinders ar
engine having an intake manifold and a plural- ‘
ranged in a line, and a crank case below the
ity of cylinders in line and an adjacent valve
chamber, a carburetor, an oil iiller tube extend
cylinders, a valve chamber laterally disposed to
the cylinders, a carburetor having an intake and
an outlet, an oil ñller tube projecting from above
the engine and extending into the crankcase be
low the valve chamber and on the opposite side
of the cylinders from the said chamber, an air
cleaner on the same side of the engine as the
filler tube, means connecting the carburetor’sV in
take with said air cleaner, an air conduit con
manifold sets up a flow of ñltered air from said
air cleaner through said iiller tube and crank
case in a transverse direction.
>ing into said crankcase, substantially below the
lower end and opposite the valve chamber and
projecting above the engine; an air cleaner, an
air conduit connected to said carburetor, meansY
connecting said air cleaner and-said air conduit,
a closurevfor sealing the upper end of said ñllerr
tube, means establishing communication between '
the upper portion of said filler tube and said air .
conduit, means including a connection between>
the valve chamber and the intake manifold'v
whereby the reduced pressure in said intake man-` '
ifold sets up a ñow of filtered air from said air
cleaner through said filler tube and crankcase,
and spring loaded valve means positioned ex
teriorly of the engine in the connection between 25
nected to said ñller tube, means connecting
the air cleaner and said air conduit, a closure
for sealing the upper end of the ñller tube, an
intake manifold connected to the carburetor’s
outlet, and valve means connecting the valve
chamber and the intake manifold.
DELMAR G. ROOS.
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