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Oct.29, 1946.
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Filed Feb. 4, 1944 '
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Patented Oct. 29, _ 1946
f Arthur‘ Townhill, Cleveland, ‘ohiopassignorv to j Thompson‘. Products, Inc., Cleveland, Ohio, at " "
corporation of Ohio
Application February 4, 1944, Serial No. 521,115
1 Claim.‘ 7 (ol. 29—156.7-)
plug in the end ?ller opening of the head of a
7 ‘This invention relates to a method of ‘making
a' hollow poppet type valve and a closure plug for
hollow poppet valve whereby the force of insert
ing the plug in the ‘opening is employed to estab
the head thereof, and more particularly to the
lish- a seal between the inner extremity'of the
plug and the ?ller opening in the head of the
manner in which the plug is ‘inserted and at
tached to the head of the valve.
1_It is important'in the fabrication‘ of poppet
Other objectsand features'of this invention
will more fully appear from the following detail
description; taken'in connection with the accom
valves having on the interior thereof a heat dissi
pating coolant" that every precaution be taken
against leakagerof ?uid into the interior of the
valve so.‘ as to preventoxidation orother dele 10 panying drawing which illustrates a single modi
?cation of the invention, and in which
terious effectszon the coolant. This problem be-'
Figure 1 is a crossgsectional view through a
comes of considerable moment at the plugged
semi-?nished valve embodying the’ features of
?ller opening of a' valve since,vfor example,_ where
this invention; _‘
metallic sodium is employed as the heat-'dissie
pating ?ller,‘ any‘ leakage of air around the 15 ‘Figure 2 is an enlarged cross-sectional view
taken through the plug of my’ invention prior to
threads of‘the pluginto the interior of the valve
the insertion of the ‘plug in the ?ller opening of
will result intoxidation of the; coolant, thereby
detracting from its efficiency.
the poppet valve;
7 _ Figure 3 is an end View ofv the plug shown in
object, thereforavof this invention is to pro;
vide a method of making a‘popp'et valve con 20 Figure 2 looking at it from the left-hand side of
struction including a closure plug for the ?ller
Figure 4 is an enlarged fragmentary cross-sec
opening with a‘ simple but ef?cient improvement
tional view of the headportionv of the valve shown
which will obviate the occurrence of leakage of
the above-mentioned character.
in Figure 1 but Withthe plug removed‘ therefrom
_ Another. object of this invention is to provide 25 so as to show’ clearly the contour of the end
opening in the valve head portion; '
a novel but simple way of securing a plug in a ,
‘ Figure 5'is a cross-sectional view of the'valve
?ller opening of a, hollow valve whereby the plug
leakage of fluid pastthe threads of the plug and
structure of Figure l butshowing the valve in
its ?nished condition after the plug vhas been
?nallyinserted and .cut and after the valve ‘has
into theinterior of the valve.~
been shaped to the desired form;
not only ‘serves its usual function of ?lling the
opening,'but in addition establishes a seal against
Figure 6 is an enlarged fragmentary sectional
view corresponding to the left-hand end of Fig
provision of‘ an inexpensive, and simple type of
ure 5 showing in detail the construction of the
plug which may be readily used for the purpose
of establishing a seal in the filler hole of a hollow 35 head of the valve after the plug has been ?nally
lA‘further object of theinvention relates to the
poppet type valve._ ‘
secured therein;
I 7
Figure 7 is‘an enlarged fragmentary cross-sec
' In accordance with the general features of this
tional view corresponding toa portion of Figure
inventionthere is provided a method of making
6‘ showing more in detail the manner in which
a ‘valve,havingjatleast the head portion‘thereof
formedhollow and ‘?lled with a heat-dissipating 40 the inner lip or skirt on the plug is deflected along
the inclined'surface of the flange at the inner
coolant ‘previously, ' introduced in the valve
extremity of the ?ller or plug opening in the
through'the end opening and also having a plug
secured in the ‘opening andvhaving an inner por
head end of the valve.
tion‘thereof ‘deflected into a metal-to-metal seal
, ingcontact with a shoulder at the inner extrem
ity of the opening to form a seal at that point.
Still another feature of the invention're'lates
tonthesecuring of the plug to the valve head
portion partly by a threaded ?t in the ?ller open-7'
ingvrand partly by being welded to the valve head
portion, whereby said welded attachment will
assist in maintaining the seal established at the
inner extremity of the plug.v
'_‘_Yet vanother ‘feature of the’ invention relates
to the provision of anew method of sealingth'e
As shown on the drawing :,
' >
“ The valve of my invention is illustrated in both
Figures land 5, it being shown in a semi-?nished
condition in Figure 1 and in its ?nished form in
Figure 5. For this reason, the samereference
v numerals‘ are being used .in both of these ?gures
character parts
Ill designates
or portions.
13; the vhollow poppet type of valve embodying the
features of this invention ‘and which is especially
adapted for use in internal combustion engines
and the like. This type of valve, as is well known
in the art, embodies a stem or shank portion H
and a head portion l2. In order to cool properly
the valve, it is desirable to form at least the head
portion thereof hollow, although as I have illus
trated it, the stem is also formed hollow, as indi
cated at I3. This hollow portion |3 may be ?lled
After the plug 2| has thus been properly seated
in the head of the valve, the valve is axially sup
ported in suitable mechanism and is shaped to
with any suitable heat dissipating coolant such,
the contour shown in the-?nished state of the
valve illustrated in Figure 5. It will be clear
from Figure 1 that the plug 2| has a center hole
26 and likewise the valve stem portion H has a
for example, as metallic sodium which has been
successfully used to withstand the tremendous
center hole 21, which two center holes are in sub
stantial axial alignment. These center holes may
heat to which the valve is subjected in operation, 10 be used in mounting the valve in suitable equip
I have
ment for shaping the same into the ?nished con
designated the coolant generally ‘by the reference , dition. In this ?nishing of the valve, it is brought
character I4.
down to the size desired and it is formed with
The semi-finished valve piece as shown in Fig
the usual spring seat retainer groove 28. There
ure 1 may be fabricated in any suitable manner 15 after, the projecting end of the plug is cut off
and any suitable material may be employed for
so that the outer end of the plug is formed flush
the same. For illustration, the valve piece may
with the curved surface it of the valve head
comprise a single steel casting. It should also be
portion. In fact, the cutting of the plug is such
noted at this time that the plug, which I shall de- ,
that its cut surface is symmetric with the curved
top surface l5 of the valve head, as designated
scribe hereinafter, may be made of the same type
at 30 in Figures 5 and 6.
of material as is employed in the single piece cast
From the foregoing it is clear that prior to the
As best shown in Figure 4, the head portion l2
insertion of the plug in the head of the valve the
as where it is used as an exhaust valve.
of the valve is provided with a curved outer face
hollow interior of the valve is ?lled with a suit
which, at its center has a tapped threaded central
opening I‘! extending through a thickened in
able heat-dissipating coolant, such, for example,
wardly offset portion I5 formed integral with the
head portion of the valve. The tapped hole may
as metallic sodium.
I have found that excellent
be supplied with any suitable form of thread al
though I have found that V-type pipethread may
results may be obtained by ?lling the cavity in
the valve to the extent of 65% of its volume with
solid metallic sodium.
After the ?lling of the valve, the plug is in
be advantageously used.
The thread I‘! at its inner extremity terminates
serted therein as described before so that it is
held in tight sealed engagement by reason of its
in a ?ange or shoulder'lt which extends radially
inner lip portion 24 being de?ected radially in
wardly along and in tight engagement with the
inward of the thread and has a smaller size or re
stricted opening l9 coaxial with the threaded 35 inclined surface 2!] of the inward offset "Son the
opening II. This opening Ii} communicates with
head portion of the valve, This sealing of the
the hollow interior of the valve stem.
plug in position is highly desirous in that it aids
The lowermost thread of those in the open
in preventing leakage of ?uid or air into the in
ing |'| terminates inva shouldered. surface which
terior of the valve; such leakage having been
in turn terminates in an inclined or slanting sur
face 20 which extends clear to the opening I9.
I propose to utilize this inclined surface 20 in
the sealingr of my plug 2| in the valve head.
40 found to be very undesirable for the reason that
the metallic sodium is readilyoxidizable and,
when oxidized, it loses its efficiency as a heat
dissipating coolant. Moreover, the oxidation of
The valve plug is designated generally by the
the metallic sodium has deleterious effects on the
reference character 2| and is shown in Figure 2 45 interior walls of the valve.
in a position preparatory to its insertion in the
It is also desirable to ?rmly hold the plug in
threaded hole H in the valve head portion |2 of
its sealed and retained position, and this may be
the valve. This plug 2| includes a squared
accomplished after the cutting off of the plug end
Wrench-gripping portion 22 (Figures 2 and 3),
bywelding the plug to the head portion |2 as
an intermediate threaded portion 23, and a re
indicated at Si in Figures 5 and 6.
duced lip or skirt-like portion 24 which is of a
It has been observed that during the welding
diameter such that it can engage and‘ cooper»
of the plug due to the heating up of the valve
ate with the inclined surface 20 of the valve head
and the threads, air leaking through the threads
upon the screwing of the plug into the tapped
tends to readily oxidize the sodium. In other
hole H.
words, the oxidation of the sodium occurs very
In the assembly of the valve the plug 2| is
readily when the same is subject to high tem
screwed into the tapped hole I'| until it is brought
peratures. By using the seal of my invention
into the position shown in Figure 1. In this po
previously described, the plug may be welded to
sition the threads on the plug are in tight co
the head of the valve Without the occurrence of
operation with the threads of the threaded hole 60 such oxidation since any air is prevented from
H, and the annular lip on the skirt portion 24
coming into contact with the sodium ?ller.
is de?ected radially inwardly along the inclined
The above description makes it clear that I
surface 20 in the thickened center portion l8 of
have not only provided a novel valve of the hol
the head portion of the valve.
10w poppet type, but in addition I have provided
As best shown in Figure '7, it will be perceived 6,5 a novel plug for closing the ?ller hole of the valve,
that the thin edge of the lip portion 26 is caused
and which plug ‘is so formed as to establish a seal
at 25 to be turned radially inwardlyalong. the
when it is inserted in a hole in the head of the
inclined surface 20 as the plugv is progressively
valve. My novel method of accomplishing this
threaded into tight engagement with the hole in
sealing operation is believed to be fully evident
the head of the valve. This de?ected lip 25 thus 70 from the foregoing detailed description and a
by reason of its wedged tight engagement with
repetition of the steps involved is not thought to
the inclined surface 20, establishes a tight metal
be necessary.
to-metal contact which results in the forming
I claim as my invention:
of a seal at the inner extremity of the holev in
The method of sealing a coolant-?lled. hollow
the head of the Valli/B.
75 poppet valve body having an internally threaded
plug-receiving ?ller aperture equipped with an
annular axially tapered shoulder adjacent its
inner end and so disposed as to block the advance
of an externally threaded aperture-?lling plug
having a continuous annular skirt on the inner
end disposed to engage the taper of the shoulder
when the plug is advanced into initial shoulder
engaging position, which comprises screwing the
plug into the aperture beyond the point where
said skirt initially engages the shoulder to de?ect 10
the skirt by means of the taper of the shoulder
as the skirt is rotated relative thereto and effect
metal-to-metal contact with a substantial an
nular area of said shoulder and establishing a
seal between the coacting skirt and shoulder sur
faces throughout said annular area, and welding
the plug to the valve body externally of said
annular area and the hollow sealed by it.
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