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Патент USA US2128414

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Aug. 30, 1938.
F55, HEWEL
‘
2,128,414
VALVE STEM GUIDE
Filed March 28, 1936
WITNESS
INVENTOR
FAQ/7MB Hewe?
$4M '
ATTORNEY
2,128,414
Patented Aug. 30, 1938
UNITED STATES PATENT OFFICE
2,128,414
VALVE STEM GUIDE
Frank B. Hewel, Pittsburgh, Pa.
Application March 28, 1936, Serial No. 71,403
‘10 Claims.
(Cl. 123-188)
My invention relates to valve stem guides for
K
operation.
and the like.
One object of my invention is to provide a valve
The valve stem guide 8 may be of any preferred
form, being shown here as tapering upwardly
from the bottom portion I3 through the middle
or bottom portion l2, while the upper portion H
Cl stem guide which will prevent sticking of the
valve stems during operation thereof in the en
gine, either by reason of expansion caused by
heating of the parts or by friction or by reason
of the suction of oil along the valve stem and the
10 consequent formation of gummy substances.
A more speci?c object of my invention is to
provide a valve stem guide having a structure so
‘designed as to completely prevent all causes of
sticking of the valve stems by so treating the
15 upper and lower ends and the central portion of
my valve stem guide in diiferent manners as to
overcome their respective tendencies to stick for’
different reasons.
Other objects of my invention will become evi
20 dent from the following detailed description taken
25
bore or enlarged opening l9 will be hereinafter
pointed out in detail.
The upper section II and also, if desired, the
lower section l3 are provided with a plurality,
here shown as four, of slots or cuts l5 which are
?lled with bronze inserts I6 brazed in place and
smoothed off, whereby, by reason of the different
Figure 1 is a view in longitudinal section, taken
through a portion of an internal combustion
coef?cients of heat expansion of the ferrous ma
terial comprising the remainder of the valve stem
guide and of the bronze inserts, the corresponding
portions H and I3 of the valve stem guide do
not stick to the valve stem during operation
thereof by reason of the expansion of the bronze
inserts.
engine, embodying my present invention;
,
Figs. 4 and 6 are, respectively, a top plan and a
bottom plan view of the structure shown in Fig. 2;
and
Fig. 5 is a transverse section, taken along the
line V—V of Fig. 2.
7
Referring to the drawing, the structure here
shown comprises a section of an internal com
bustion engine I, including a cylinder 2, a recip
rocatory piston 3 therein, the usual spark plug 4
at the head of the cylinder, a cam shaft 5 of a
40 usual character for reciprocating a valve stem 6,
on the upper end of which a valve 1 is provided
for controlling the ingress of combustible gas
to the cylinder 2, and my improved valve stem
guide 8, which is located in the usual position ‘in
45 the engine block near the cylinder 2 for properly
guiding the valve stem 6 in its reciprocatory
movements.
Referring more particularly to Figs. 2 to 6, in—
elusive, my improved valve stem guide, which is
50 preferably a unitary body composed of some suit
able ferrous material, comprises an upper section
II, a middle section or body l2 and a lower sec
tion l3, all of which are treated in different man
ners, as hereinafter more fully described, to pre
55
19 at the lower end of the guide, so that a cer
tain annular space surrounds the valve stem 6
Where encased by the lower portion I3 of my
valve stem guide. The purpose of this counter- 15
in which:
along the line III—III of Fig. 2;
35
is of reduced diameter.
A suitable opening or bore I4 extends from the
top of my valve stem guide through the portions
H and I2 and into the lower’portion l3 where
it communicates with an enlarged counterbore
in conjunction with the accompanying drawing,
Fig. 2 is an enlarged view in side elevation of
my improved valve stem guide or sleeve;
Fig. 3 is a View in longitudinal section, taken
30
valve stem guide on the valve stem during its
the valve stems of internal combustion engines
vent sticking of_ the respective portions of my
The central or body portion of the valve stem '
guide is provided with a relieved part comprising
a plurality of internal circumferential grooves ll
surrounding the bore l4,‘ thereby providing a
series of alternating grooves I1 and ribs or bear
ing surfaces l8. Consequently, when the central 3
portion of my valve stem guide is under high
compression, by reason of the expansion of the
surrounding portion of the engine block as a
result of high heating thereof, the pressure ex
erted on the valve stem by the central portion
of my valve stem guide is reduced by reason of
the provision of these alternate grooves and ribs.
Thus, for the central portion of my valve stem
guide, the tendency to stick is removed as a result
of this reduction in pressure exerted on the valve
stem.
The purpose of the large counterbore l9 at the
lower end of the lower portion l3 of my valve -
stem guide is to break the vacuum or suction
action that would otherwise occur along the valve
stem if a tight ?t obtained between it and the
lower portion l3. Consequently, the outer lower
section or wall of the portion l3, in the ?rst place,
acts as a shield or skirt to prevent the oil spray
from actually hitting the enclosed portion of the
2.,
2,128,414
valve stem, and secondly, there is thus practically
prising an end portion having longitudinal slots
no oil on that enclosed portion of the valve stem
?lled with inserts of a different coe?icient of heat
expansion, a central portion having spaced con.
tact with the valve stem to reduce pressure there
on, and another end portion with a counterbore
to be sucked therealong into the bore I4 during
the reciprocatory movements of the valve stem.
As a result of this absence of oil along the valve
stem inside of the bore l4, there is no tendency
in my construction to create carbon and gum on
materially larger in diameter than the valve stem
to prevent oil suction therealong during its recip
the valve stem to cause it to stick.
rocatory movements.
'
It will be seen that I have thus provided a valve
'
alternating grooves ll and ribs H8 in the middle
5. A valve stem guide of ferrous metal for pre
venting a reciprocatory valve stem from sticking 10
therein comprising anv upper end portion having
longitudinal 'slots ?lled with bronze, a central
section and the enlarged counterbore I9 at the
portion having a plurality of spaced internal ribs
stem guide which embodies three different means,
namely, the’ bronze inserts IE3 at the top, the
the
bottom,
valvefor
stem
so guide
treating
as to
the
prevent
respective
theirsections
particular
:of j for contacting the valve stem to reduce pressure
vthereon, and a lower end portion with a counter 15
tendency to cause the valve stem to stick therein, , bore materially larger in diameter than the valve
As a result, my valve stem guide, as a whole, * ‘stem to prevent suction of oil into the central
serves to prevent sticking of; the valve stem there
in from any cause, thereby making for improved
portion-of the vguide as the valve stem is recipro
cated therein.
operation of the internal combustion engine-3 in I
16. A valve stem guide for preventing a recip 20
which my valve stem guides are incorporated and rocatory valve stemfrom sticking therein com
longer life of the valve stem and valve stem vguide. prising an end portion having inserts of a dif
I do not wish toybe restricted to thespe'ci?c
structural details or arrangement of parts herein
set forth, as various modi?cations thereof may
be effected without departing from the spirit and
scope of my invention. I desire, therefore, that
only such limitations shall be imposed thereon as
are indicated in the appended claims.
I claim as my invention:
,
>
therefrom, said inserts extending to the edge of 2,5
said end portion.
.
‘
7. A valve stem guide for preventing a recip
rocatory valve stem from sticking therein com
prising an end portion having longitudinal slots
extending to the edge of said end portion ?lled 30
1. A valve stem guide for preventing a recipg
rocatoryj valve stem from sticking therein com
prising a portion having metals of different .00
pansion for jointly contacting the valve stem and
expanding away therefrom, said inserts extend
e?icients of heat expansion for jointly contacting
ing to the edge of said end portion. I
the valve stem and expanding away therefrom,
v8. A valve stem guide of ferrous metal fo.r‘pre~ w
venting a reciprocatory valve stem from sticking
a second portion having an internal relieved part
to reduce pressure on the valve stem‘, and an
other portion counterbored to prevent oil suction
with inserts of a different coefficient of heat ex
'
therein comprising an end portion having longi
2. A. valve stem guide for preventing a recip
rocatory valve stem from sticking'therein com
tudinal slots extending to the edge of said end
portion ?lled with bronze inserts for jointly con
ta'cting the valve stem and expanding away there .410
from, said inserts extending to the edge of said
prising metals of different coefficients of heat ex
end portion.
along the reciprocatory stem. v
_
.
‘
pansion for jointly contacting the valve stem and
expanding away therefrom, internal pressure-re
reciprocatory valve stem from sticking therein
ducing means and oil-suction-prevention means.
comprising an internally grooved central portion .
3. A valve stem guide forv preventing a recip
rocatory valve stem from sticking therein’ com
prising an end portion having inserts of a differ
ent coe?icient of heat expansion, 'an internally—
grooved central portion to reduce pressure on
the valve stem, and another end portion with
an enlarged opening surrounding the valve stem
to prevent oil suction therealong during its recip
rocatory
55
ferent coef?cient of heat expansion for jointly
contacting the valve stem and expanding away
motion.
a
i
.
4. A valve stem guide for preventing a recip
rocatory valve stem from sticking therein com
v 9. A valve stem guide for preventing'a smooth
to reduce pressure on the valve stem, said central
portion directly abutting both end portions of
said guide to form a unitary body.
10. A valve stem guide for preventing a smooth
reciprocatory valve stem from sticking therein
comprising a ‘central portion having a plurality of
spaced internal ribs for contacting the valve stem
to reduce pressure thereon, said central portion
directly abutting both end portions of said guide
to form a unitary body.
‘
FRANK B. I-IEIWEL.
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