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Патент USA US3040777

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June 26, 1962
J. J. PlPPENGER
OSCILLATING VALVE
Filed Aug. 15, 1959
3,040,768
United States Patent
M
3,840,768 '
~ Patented June 26, 19.62
1
2
3,848,768
the. body 6 communicate. with annular grooves 6.0 and 62
inthe ported. sleeve 18 which, in turn, communicate with.
the central aperture extending through the ported sleeve
by means of-radial passageways v64 and 166, respectively,
?f‘aClliLATh‘lG VALVE
John J. Pippenger, Manchester, Mich, assiguor to Double
A Products Company, lvr’anchester, Mich, a. corpora
tion of Michigan
\ in aconventional manner. Of course, depending. upon the
Filed Aug. 13, 1959, Ser. No. 833,423‘
5 Claims. (Cl. 137'-—330)
position of the spool 2.0.~ relative to'the ported sleeve 18'
the radial passageways 64. and 66..will communicate with
the other'radial passageways. and» annular grooves of the
ported‘ sleeve 18. and. other passageways in the valve body
6 (not shown.) in a conventional manner.
The. spool 20 is shifted to the right by the plunger 48
when the solenoid 42 is energized, and is shifted to the
will sometimes tend to stick or bind in a manner that
left by the plunger 50 when the solenoid 4.4 is energized,
makes the spool di?icult to shift. For certain applica
the spool returning to the. neutral position illustrated when
tions, such as solenoid actuated pilot valves, if. the-spool 15 both- of the solenoids are deener-gized. When. the. spool
should stick or bind it will frequently prevent the’ sole
20 shifts in this manner, it, of course, controls the ?ow
noidwfrorn shifting the spool. Of course, such. sticking is 7
of ?uid through the passageways. 56 and 58 and. thereby
very undesirable, particularly in many applications where
controls the ?ow of ?uid through passageways 68 and 70
dependability of operation is of primary importance.
“It is one object of'the present invention to provide a 20 in the valve 4. vSince the particular valve llv illustrated is
a spool valve,.the passageways 68 and 70. can alternately
greatly simpli?ed construction for oscillating or dither~
introduce pressurized ?uid to one of the. cham‘bersad
ing a spool-type pilot valve to prevent sticking. or binding
j'acent, one end of the, spool ofthe valve 4» and connect
of the spool.
'
the other chamber to tank in- a conventional manner to
It is. another object of the invention to provide, a pilot
hydraulically shift the spool back and forth to control the
valve wherein the ported sleeve in which the spool slides ' flow
of‘pressurized ?uid through the valve "4.
isoscillated at a high frequency to prevent sticking or
~ The improvement .of the‘. present invention, is speci?cally
binding of the. spool.
.
directed to- the problem of eliminating the sticking of the
It is a still further object of the invention toprovide a
spool 20 in the ported" sleeve 18. and accomplishes this
spool-type pilot valvehaving an oscillated ported sleeve
The present invention relates to spool valves and par
ticularly to a spool-type pilot valve oscillated in a manner
to prevent sticking or binding.
As is well known in the art, the spool of a spool valve
in a very unique manner, namely, by oscillatingor dither
which is economical to manufacture, simple in construc 30 ingthe ported sleeve 18 relative to the body 6‘. To accom
tion, and effective in. operation.
‘
_
plish‘ this the ported. sleeve 18 is slidably sealed in the
‘Other objects and. features of novelty of the invention
bore. 8,- as previously mentioned, rather than press ?tted
will be specifically pointed out or otherwise ‘become ap
within the bore as is normally done in prior art valve con
parent when referring, for a better understanding of the
structions. The ported sleeve 18 is also made slightly
invention, to the following description taken in conjunc 35 shorter
in length than- the distance between: the adjacent
tion with the accompanying drawing, wherein an eleva
faces. of the bushings 22 and 24 so that it can be oscile
tional view, partly broken away, of a pilot valve embody
la-ted back and forth. .
_
~
ing features of the present invention is illustrated. mounted
Sincethe ported sleeve is. being oscillated, rather than
on a spool valve.
spool itself, for example, it can be oscillated very
Referring to the drawing, a pilot valve 2 embodying 40 the
simply‘
by a miniature electric motor 72
features of the present invention is illustrated mounted V mountedand,oneffectively
a. cap 74 secured directly to the body 6.
directly on another valve 4 ‘which may be, for example,
The output shaft '76 of the miniature electric motor 72
a spool valve controlled by the pilotvalve 2. .The pilot
has
an adapter 78 suitably secured thereto, such, as by
valve 2 comprises a body 6 having a transverse. bore 8
extending therethrough with enlarged counterbores. 10
45 a set screw 80 or the like, and the adapter has a tongue
82, projecting downwardly therefrom into a groove 84
in the upper end of a shaft 86' rotatably journal'edin'a
and 12‘ at each end' thereof, each of the counterbores also
being countenbored as at 14 and 16.
'
counterborel 88 in the body_6 by suitable bearings 98.
A ported sleeve 18 is slidably sealed within the ‘bore 8,
A reduced end portion 92' of the pin-86 extends down;
and a spool 20 is slidably sealed ‘within the ported sleeve
18 in a conventional manner.
Bushings 22 and 24 are 50 .
slidably disposed on projecting ends 26 and 28 of the
spool, respectively, and are normally urged into abutting
engagement with shoulders 30 on the inner ends of the
counterbore 1t) and 12, respectively, by coiled springs 32
and 34 to center the spool in the position illustrated. The
other end of each of the springs bearsagainst a ?ange 36
of bushings 38 and 40 slidably disposed in the counter
bores 14 and 16.
Suitable electric solenoids 42 and 44 are mounted on
the sides of the :body 6 and compress the ?anges'36 of
the bushings 38 and 40 inwardly against suitable O-rings
46 disposed within the counterbores 14 and 16 to provide
a ?uid-tight seal. Plungers 48 and 50 of the solenoids 42
and 44 project from the solenoids through the bushings
38 and 40 and abutting-1y engage the projecting ends 26
and 28 of the spool 20, the plungers 48 and 50‘ being slid
ably sealed within the bushings 1by suitable seal elements
52 and 54.
-
With this construction, it is apparent that when the
solenoids '42 and 44 are not energized the springs 32 and
34 will normally center the spool 20 in the position illus
trated in the drawing wherein passageways 56' and 58 in
wardly through and is rotatably sealed within 'a ‘?anged
bushing 94 seated within the counter-bore 88 with the
body thereof press ?t into an aperture 96 in the body
6, the lower end of the aperture 96 communicating di
rectly with the central bore 8 adjacent an ‘annular groove
98 in the ported sleeve-18. An eccentric pin 1% pro
jects downwardly from the lower end of the reduced
end portion 92 of the shaft 86 into the annular groove
98 in a manner to oscillate the ported sleeve 18 back
and forth in response to the rotation of the ‘shaft 86 by
the miniature electric motor 72.
vIt will be observed that the diameter of the eccentric
pin 100 is slightly less than the width of the annular
groove 98 so that the eccentric pin engages the right
wall of the groove 98 as it shifts the ported sleeve 18
; to the right, and will engage the left Wall of the annu
lar groove as it shifts the ported sleeve to the left. With
this construction, the eccentric pin 100 will not only re
ciprocate the ported sleeve back and forth, but will ‘also
rotate it ?rst in one direction, due to the rolling engage
ment of the eccentric pin with the right wall of the annu
lar groove 98, and then will rotate it an equal amount
in the opposite direction, due to the rolling engagement
3,040,768
of the eccentric pin with the left wall of the annular
groove.
From the foregoing, it is apparent that the present
invention provides ahighly advantageous, simple and
economical construction for preventing sticking of_thev
4
tating said shaft, said shaft having an eccentric pin whose
diameter is less than the width of said annular groove
on said ported sleeve into which it projects so that the
rotation of the eccentric pin rotates and shifts the ported
sleeve in one direction and rotates and shifts the ported
sleeve in the opposite direction during each complete
spool 8 Within the ported sleeve 18. By oscillating or
revolution of the eccentric pin.
dithering the ported Sleeve ‘as described, rather than at
4. A spool valve comprising a body having a central
tempting to dither the spool itself, for example, the
bore therein, a ported sleeve slidably sealed within said
mechanism required for transmitting the oscillating move
ment is greatly simpli?ed since the ported sleeve is more 10 bore, said sleeve having a central aperture extending
therethrough and a plurality of angular grooves in the
accessible. Further, thepresent invention provides a spe
ci?c mechanism for ditheringthe ported sleeve, namely
annular surface thereof with radially extending ports
communicating said‘ annular vgrooves with the central
aperture, a spool slidably disposed within the central
by a conventional miniature electric motor in a very 15 aperture of said ported sleeve, a shaft rotatably jour
the eccentric pin 100 projecting Within the annular groove
98 of the ported sleeve, which can be readily actuated
convenient and economical manner.
‘ ’
While it will be apparent that the embodiments of
'the invention herein disclosed are, Well calculated to ful
?ll the objects of'the invention, it will be appreciated
that the invention is susceptible to'modi?cation, variation
and change withoutrpdeparting from the proper scope or
fair meaning of, the subjoined claims.
naled in said body, a miniature electric motor ‘mounted
on said body and having the output shaft thereof keyed
to the other end of said shaft, said shaft having an eccen
tric pin‘ on one end thereof whose diameter is less than
the width of said angular groove into which it projects
so that the rotation of the eccentric pin rotates and re
ciprocates the ported sleeve in one direction and rotates '
and re‘ciprccates the ported sleeve‘ in the opposite direc
What is claimed is:
I
‘
.
tion duringeach complete revolution of the eccentric pin.
l l.,_A spool valve comprisinga body having a central
boredherein, a ported sleeve slidably sealed within said 25 5. .A spool valve comprising a body, means de?ning
a central bore in vsaid body, means de?ning an aperture
bore, said sleeve having a‘. central aperture extending’
in said body intersecting said central bore, a ported sleeve
therethrough and a plurality of angular grooves in the
slidably‘sealed within said central bore, a spool slidably
annular ‘surface thereof with radially extending ports
disposed Within said ported sleeve, a shaft rotatably jour
communicating said angular grooves with the central
aperture, aspool slidably disposed Within the central 30 naled in said aperture, means for rotatingsaid shaft,
- aperture of said ported 'sleeve, a shaft rotatably jour
naled in said body and having an eccentric pin on one
means de?ning an annular groove .in said sleeve having
a ?rst wall and a second wall, and an eccentric pin on
' one end of said rotatable shaft projecting into said annu
end thereof projecting into, one of said angular grooves
la-r groove to alternatively engage said ?rst and second
011‘ said ported sleeve, and -a_mim'ature electric motor
mounted on said body and having the output shaft there 35 walls of said annular groove, Said eccentric pin having
an outside diameter less than the width of said annular
of keyed to, the other end of said shaft for rotating the
groove to produce ‘a rolling engagement between said
shaft to cause said eccentric pin to oscillate the ported
eccentric pin and said ?rst and second walls of said annu
sleeve relative to said body.
.
r
'
t
' 2. A spool valve comprising a‘ body having a central
lar grooverfor concurrently rotating and reciprocating
bore therein, a ported sleeve having lan annular groove 40 said ported sleeve within said central bore. ‘
in the outer Surface thereof slidably sealed within said
References Cited in the ?le of this patent
bore, a spool slidably disposed within said ported sleeve,
a shaft rotatably journaled in said body and having 'an
UNITED STATES PATENTS
eccentric pin on, one‘ end thereof projecting into said
annular groove on said ported sleeve, andmeans for 45 ‘1,511,425
1,512,804
rotating said shaft to cause said eccentric pin to oscillate
2,065,702
said ported sleeve relative to said body.
2,426,986
3. A spool valve comprising a body: having a'central
2,548,071
bore therein, a ported, sleeve having an annular groove
in the outer surface thereof slidably sealed within said 50
bore, a spool slidably disposed within said portedsleeve,
a shaft rotatably journaled in said body, means for ro
691,383
Rou‘c'ka ______________ __ Oct. 14,
Roucka ______________ __ 0ct.'2l,
Hubbard ____________ __ Dec. 29,
Dawson ______________ __ Sept. 9,
1924
1924
1936
1947
Saulsberry ___________ __ Apr. 10, 1951
FOREIGN PATENTS
Great Britain _________ __ May 13, 1953
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