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Патент USA US2404827

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R. CHILTON
VALVE GEAR
Filed NOV. 12, 1941
3 Sheets-Sheet 1
ENVENTQR
Raiamd Ch?i‘am.
.
July so, 1946.
R. CHILTON‘
2,404,827 _
VALVE GEAR
Filed Nov. 12, 1941
5 Sheets-Sheet 2
,
'
INQENTQR»
Roland Chi/fan.
ATTORNEY
I
July 30, 1946.
R.
CHILTON '
VALVE GEAR‘
Y
2,404,827
-
Filed Npv. 12, 1941
S'SheetsQSheet s *
Roland chi/ran;
ATTORNEY _
Patented July 30, 1946
2,404,827
EPATENT sorrel-‘ice.
"UNITED :srares
" 2,404,827,
VALVE
Roland fch-ilton, Ridgewoo‘d, . L3,, assignor at?
Wright Aeronautical Corporation, a corporaj
‘ tion of" New‘ York
:appiicaeonsnovemher 12, 194-1;Serial;No.:418;?4;9
'14 IClaims.
1
(019123490)
'
,7
‘
2
1
complementary to-the cylindrical surface-of‘th'e m
'bore J8. The other~end;issprovidedwith ai?ller'; ,
This invention relates to valvergearsrand par
ticularly ‘ to operating ‘mechanism rfor ='valve-in—
hea‘d cylinders for aircraft engines. A prime
washerizil\the:exterioryof ‘WhlChrlS also ,formed" . v
object of ‘the inventionds to~provide valve’oper
in complement to the .surface'mf’the bore 43.1} '
ating mechanism which occupies :less length, .5 yBetweenthe'headzof the Journal vmember ‘IS-rand
axially of ' the cylinder, ‘than ‘the :arrangements
the washer 23, an anti-friction hearing ‘21 is .
disposedfupon’whicha rocker arm 22.is:mounted. "
conventionally used. A further object-istmpro
Therocker-parm-and members [-9 and ZOFareQseP
vide a valve , mechanism for. radial :cylinder ?en
cured- in-the bore - I 8 {by rat belt or pin '24 passing
gines by which the overall diameterlofwthe engine
I.
»may be materially reduced. ~A-iurtheraobject is 1O through.the-housingll'. ' ~
The‘righthand :endof the rocker arm 22, as
to_ provide- a ‘ mechanism: in which 1a positiva-pu-sh
showngin~FFigs.,-1,~3,.4, 8,"and-,9,:is provided with
pull‘con‘n'ection isestablished between -a valve
a bossuzdhavingaa cross zbore -2>B,->the lower end
‘stem and an operating: mechanism itherefor, {to
of (the boss '-at the .crossé.bore ‘being bifurcated ‘ as
eliminate the necessitylof'lofcating :thevusual valve
springs around the valve stem. Ai-turther'object 1'5 vshownr at-Ql :in»F'igs.--9.1-and #3’ to :allowifor, passage
- the valve .stem 4:5. 7, Thelatten is grooved .just
isito provide a'valve mechanis'min which‘ valve
below‘ its top as» at it‘ to ,passthrough ’ the‘ slot'z'l
closing springs may be disposedialongsid'e of the
and has- a [?attened .‘head' or *button ~39 which is
- engine cylinder, rather :than ontop- ofethe' cylin
slidably ?tted-tea T-shape'd slot 32in a trunnion
der, as is ‘conventional with overhead valve en
gines. Still another object is :to :providespeci?c '20 ~33:journalled-in‘the-rockerarmbore 26. ,‘I‘he
twoeway connections betweenvthevalve-wstemrand
a remote valve operating imecha‘nism, iwhere‘by
positive ‘closure, .as well as ipositivesopenin'g =of
the‘evalve may‘ be‘ secured.
rocker -. arm aboss ‘125; is .relieved ‘ as eat? 34' tore-allow
\passage: of the valve {button 36, and :it will be
apparent that the ‘valve-is freeito'vslidezand'to
creep rotationally on ,itseown lax-is with-respect
.
:Further .obj ects "of Ithe invention :will aioecom'e 25 to :the trunnion-.33. , “However, in :virtuezof =the '
apparent in reading the detailed ides'cripti'on
T-slot Q32‘, “the valvefan-d trunnion :33 are (con
strained to Joint reciprocation 'and :since-the ,
‘trunnion’ .is . journalled ~Withi1‘l (the rocker arm,
- below inycon'nection :withithe'idrawingspiniwhich:
iliisua section'sthrough part .‘of Ban-engine
fcyl'inder-andIa valve- gearl-a'ccordingito thislinven
1the~valve~andzrocker armihavea-push-pull artic
30
ulation.
_
,
1
=Thelefthand end=of~ the>rocker arm is provided
with‘ a journal ;-portion 35‘ embraced ,by a‘ bearing
fFig. 551s: anrelevation of one end of: alpushepull
rod;
vlolock 3-‘! whose ‘exterior iform Eis =substantially' '
rsquarewand whose side-‘faces rubtagainStH-?ats-B‘B
machined>in~a rockerwbox extension housing .39
Fig. '7 is an elevation iofpart of the “engine
secured - over ethe endiof the rocker "arm .to "the
cylinderrs'howing the rocker'iboxianid valvetspi'ings
in section;
‘Fig. 8-is an elevation, ‘partly'inisecti‘on, fofea
housing ill. :Theblock ‘31 assumes uside'thrust
loads ~imposedabyra slanted push-pull valve .oper
ating ,mechanism to Joe describedshortly. The
,rocker arm; and
‘Fig.9 is‘ia' section on‘? the line 949::ofzEig5‘8.
The illustrations are exemplaryl-of anfrappli
-cation of the invention .t'ora'n’a-ir-‘cooled cylinder
of a'radial cylinder aircrattwengine. slnrth'e sev
eral ?gures, l0 ‘represents the cylinder z'hea'd
proper, havingthe usualcooling ?ns, Hwan'd hav
ing an intake or exhaust. port i~2.,h'aving=a :valve
seat-l3 upon which avtulip head valve -|/4%':'seats,
said valve having a stem :15 :reciprocablein La
'valveguide i6 in'aniextendediportion :i-‘l ofrthe
cylinder head which formsi'an'integral valve-‘and
:40 .left end of . the’, rocker arm-(22 isiormedas ash-all
~49 whosersidefaces- are, flattened as showmat M
in Fig. ~‘7.
~
Integral with w and ~loeneath ‘the-housing exten
vsiona39 is a valve->springr.cagew43 ‘within which
one?onmore‘valvesprings 4Q are-housed, these
»>springs bearing-at their rtopendsragainst-gthe :top
of-the-cage 43. Therbottom endsrofsthesprings
AIL-bear on-‘a-washer435 whose edge \is-j'spherical- ized :to engageea cylinder :portion '45 ‘forming / a
'bottom closure ~ for the ‘spring .cage es; sai'dzcylin
der 46 serving to hold the washer lz?econcentric '
therewith and to allow of angula-tion-gof Fthe
rocker box housing 'and'also serves‘ to=de?ne* the
, Washer ‘axis ‘with: respect torthe axis-of~-the»,-cylin
contour of the valve port I2. The ‘housing I“! is
der J46. , The washer is integral (with aélin-k 148
‘provided with a bore 1-8 in‘which» is ?ttedvarrocker
arm .journal member [9 one *end 'of which is 5'5 jwhose upper .end is {formed as, a?oalli socketrll?.
2,404,827
4
3
As shown in Figs. 5 and 6, the socket is provided
modi?cations may be made therein without de
with opposed cylindrical segmental cutouts 50
interrupting part of the spherical ball socket so
that it may be assembled upon the ball end 40
of the rocker arm. Such assembly is effected.
parting from the spirit or scope thereof. I aim
in the appended claims to cover all such modi
?cations and changes.
I claim as my invention:
by swinging the link 48 to a substantially hori
1. In combination, a ?rst member, a second
member, and a push-pull connection between
zontal position, referring to Fig. 7, whereupon
said members, said connection comprising a re
the spherical portions of the ball end may pass
cessed neck portion adjacent one end of said
through the cylinder segments 58 of the ball
socket, the ?ats 4! of the ball passing the spher 10 ?rst member de?ning a button at said end, and
a cylindrical trunnion slotted to ?t said button
ical portions of the socket indicated at 52 in
and clear said neck portion, said trunnion being
Fig. 6. Thereafter, the link 138 is swung down
journaled in said second member.
to its operating position and a secure joint for
2. In combination, a slidable member having
push-pull operation is alforded between the link
and the rocker arm. From the structure thus 15 an annular groove adjacent one end de?ning an
end head portion forming opposed shoulder sur
far described, it will be apparent that the springs
faces, a trunnion member slotted to slidably re
44 place the link 48 under tension, thereby tend
ceive said surfaces, and a lever within which said
ing to swing the rocker arm 22 counterclockwise
trunnion is journalled. ,
and thereby holding the valve head l4 against
20
3. In combination, a slidable member having
its seat I3.
an annular groove adjacent one end de?ning
Valve opening is effected by a push rod 55 op
an end head portion forming opposed shoulder
erated by the conventional engine cam, this push
surfaces, a trunnion member slotted to slidably
rod having a stem 56 screwed into its upper’end
receive said surfaces, and a lever, said trunnion
and secured by a lock nut 51. Over the upper end ,
being-journalled in one end of said lever, said
of the ‘stem 56 is sleeved a thimble 53 whose up- ‘
lever end being slotted to pass said head and
per end is formed as a half-ball to engage a
grooved portion of said member.
socket element 59 piloted in and bearing against
4. In combination, a cylinder head, a cylin
the link 65. The stem 56 is formed with an abut
drical bore within said head de?ning a rocker
ment'?ange 69 which bears against the bottom
of the thimble 58, and valve opening force is 30 arm housing, rocker arm journal means com
prising segmental end portions ?tted to said bore,
transmitted from the stem 56 to the thimble 53
a journal integral with one of said end portions
at this point. It will be apparent that this op
and extending transverse to said bore to the
erating connection forms a convenient point at
other segmental end portion, and a rocker arm
which valve clearance may be measured, which
on said journal.
measurement may be accomplished by inserting
5. In combination, a cylinder head, a cylin
a feeler gage between the abutment 60 and the
drical bore within said head de?ning a rocker
thimble 58. Clearance adjustment is aiforded.
arm housing, rocker arm journal means com
as above indicated, by changing the axial rela
tionship of the stem 56 with respect to the push 40 prising segmental end portions ?tted to said bore,
a journal integral with one of said end portions
rod 55. Little or no lost motion may take place
and extending transverse to said bore to the
except in the immediate vicinity of the clear
ance adjustment connection since the valve
springs, located as shown, take up all slack in
the rocker arm mechanism.
As shown in Fig. '7, the spring'hcusing 43 along ‘
other segmental end portion, a rocker arm on
said journal, said rocker arm and journal means
being slidable endwi-se into the bore, and a cross
pin passing through the walls of said bore and
through said journal.
_
1
with the push rod and associated parts are angled
. 6. In combination, a cylinder head, a bore with
to a considerable extent with respect to the valve
in said head and spaced from the outer walls of
axis and it is for this reason that side thrust is
said head thereby providing a one piece wall
exerted upon the rocker arm which side thrust
50 about said bore, a valve stem slidably mounted
is taken up by the thrust surfaces 31 and 38.
within said head and disposed substantially
As is conventional in aircraft engine practice,
transverse to said bore, a rocker arm pivotally
the push rod is protected by a tubular housing
supported by the wall of said bore, said rocker
52 and this is joined to the valve cage closure 46
arm having one end engaging said valve stem
by a hose 63. Sui?cient space is left between the
top of the push rod housing 62 and the bottom 55 adjacent the inner end of said bore and having
its other end disposed adjacent the open end of
of the closure 46 so that, when the hose 63 is
said bore, a link articulated to said other rocker
loosened and slid down over the push rod, ample
arm end, cover means disposed over‘ the open
room is allowed for valve clearance adjustment.
end of said bore and having a cylindrical portion
Lubrication of this system is quite similar to
surrounding said link, said link having a head
that utilized in conventional rocker arm arrange
portion slidably and rock-ably ?tted to said sur
ments. Oil is fed through the hollow push rod
55, through the stem and thimble, through the
rounding cylindrical portion, and spring means
disposed within said cylindrical portion and act
link 48, to the lefthand end of the rocker arm
ing against said link head portion to bias said
22 whereat the ball and socket joint between the
link and rocker arm are lubricated. Thence, lu 65 valve stem in a valve closing direction.
'7. In combination, a ?rst member, a second
bricant travels through drillings in the rocker
member, and a push-pull connection between said
arm to the rocker arm bearing and to the trun~
members comprising a ‘pair of opposed co-axial
nion surfaces at the top of the valve. Surplus
shoulder surfaces on one of said members, and a
oil in the rocker box may return to the engine
through the spring cage 43 and the push rod 70 trunnion member slotted to slidably receive said
housing 62.
While I have described my invention in detail
in its present preferred embodiment, it will be
obvious to those skilled in the art, after under
standing my invention, that various changes and
surfaces, said trunnion member being journaled
in the other of said members.
‘
8. In combination, a ?rst member, a second
member, and a push_pull connection between said
members, said connection comprising-a recessed
2,404,827’
neck portion adjacent one end of said ?rst mem
ber de?ning a head portion at said end, a boss
at one end of said second member, and a cylin
drical trunnion journaled within a bore in said
boss and having a T-shaped slot to ?t said head
and to clear said neck portion.
9. In combination, a reciprocal member, a
said bore, a valve stem slidably mounted within
jacent one end of said reciprocal member, and a
valve in a closing vdirection, and cover means over
said head and disposed substantially transverse
to said bore, a rocker arm pivotally supported by
the wall of said bore and having a push-pull con
neotion with said valve stem at one end of said
rocker arm and adjacent one end of ‘said bore, a
valve operating member having a push-pull con
lever, and a push-pull connection between said .
nection with the other end of said rocker arm ad
jacent the other end of said bore, a spring acting
member and lever, said connection comprising a
head having spaced parallel surfaces formed ad 10 on and surrounding said member to urge said
cylindrical trunnion journaled in said lever and
said other bore end providing a housing for said
having a slot slidably engaging said parallel sur
spring.
7
_,
13. In combination, a cylinder head having a
faces.
10. In combination, a ?rst member, a second 15 cylindrical bore de?ning a rocker arm‘ housing,
a pair of diametrically opposed cylindrical seg
member, and a push-pull connection between said
members, said connection comprising a head por
ments within said bore and having a space there- ‘
tion formed on said ?rst member, and a cylindri
cal member having a slot ?tted to said head por
between, a shaft-like member extending across
said space with its axis ‘transverse to the axis of
tion, said cylindrical member being journaled in 20 said bore, and a valve operating rocker member
pivotally mounted about said shaft-like member
said second member.
and disposed in the space between said segments.
11. In combination, a reciprocal member, and
a rocker member having a push-pull connection
14. In combination, a reciprocal member, a
rocker member having a push-pull connection
with said reciprocal member, said connection
comprising a neck adjacent one end of said re 25 with said reciprocal member, said connection
ciprocal member and de?ning a head at said end,
comprising a head portion formed on an end of
a bearing boss at one end of said rocker member,
said reciprocal member, a trunnion member re
cessed forrotatably and slidably receiving said ~
and a cylindrical trunnion journaled within said
head portion, and a bearing portion at an end of
bearing boss and having a slot to slidably ?t said
head and to clear said neck, said boss having a 30 said rocker member, said trunnion member being
journaled in said bearing portion and said bear
slot to pass said neck and head of said reciprocal
ing portion having an opening at one side for
member.
passage of said head portion into said trunnion
12. In combination, a cylinder head, a bore
within said head and spaced from the walls of
member.
'
said head so as to provide a one piece wall about 35
ROLAND CHILTON.
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