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Патент USA US2107070

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Feb. 1, 1938.
' 2,107,070
Filed Sept. 18, 19-36
'1, -
Patented Feb. 1-, 1938
Werner Fleury, Arbon, Switzerland, assignor to‘
Societe Anonyme Adolphe Sa'urer, Arbon,
Switzerland, a corporation of Svvitzerl'amiv
Application Septemberll8, 1936, Serial No. 101,357
In Germany May 9, 1936
2 Claims. ((31. ctr-‘25)
In the operation of’ internal combustion en? . which is mounted for rotation in a bearing sleeve
gines, in which the fuel is injected into the com-7 4 which maylform part of the engine housing 5.
bustion chamber of the engine, and which are . A ?uid, preferably lubricating oil, is supplied un
required to have a wide range of speed variation, der pressure from a suitable source to the interior
5 as in the case of Diesel engines in automotive of the sleeve 6 by an oil feed pipe 6. It is deliv- ,5
ered to a longitudinal channel ‘I formed in the
use, it is desirable, in order to assure smooth oper
ation, that the instant ;of beginning injection of inner surface of the sleeve I and thence'to an an
nular groove 8. formed in the ‘inner surface of,
the fuel should be advanced or retarded v‘in ac
cordance with the increase or decrease of the
10 speed of operation. Attempts have been made
heretoforeto provide means whereby the injec
tion of the fuel can be given a lead or a lag as
determined by the variation in speed of operation
of the engine,‘ but thusfar, so far as known, the
15 mechanism devised for the‘ purpose has been
the sleeve 4 near one end. The left hand end of
the chamber within the sleeve 4 is closed by a 10
closure head 9 which is provided on its outer face
with brackets II) in the outer .ends of which‘are
pivotally mounted, as at II, the bell crank levers)
I4 which support on their horizontal arms cen
complicated, unwieldy and requiring constant
supervision to maintain certainty in operation.
trifugal weights .I3-and have the ends of their 15
other arms forked, as at I 5, to engage a transverse
pin I6 of a control rod 11, the two centrifugal
inder a relative lead or lag in the rotation of the
the left.
These objections have been overcome by the pres - weights 13 being connected-by a spring 12 as
ent invention in which a servo-piston which is usual. It, will be understood that the centrifugal
20' movable longitudinally ,under the control of a governor thus described rotates with the driving 0
centrifugal governor and, being also capable of gear I of the injection pump and that as the
speed increases the centrifugal weights ?y out
rotation, is coupled to a driving gear of the in
jection pump, is in such operative relation-with ward and the control rod I1 is moved to the right,
the cylinder of the servo-piston, which rotates while as the speed of rotation of the pump de- . i
25 with a shaft of the engine, that through the rela—. creases the centrifugal weights move toward the
axis of revolution and the control rod I'I moves to
tive longitudinal movement of the piston and‘cyl
The control rod 'I'I moves longitudinally intthe
bore 4| 9 of the hollow servo-piston rod. 20, on
which is mounted the servo-piston 2| adapted for
of the speed of rotation'of the driving gear of the )7 movement within the servo-cylinder 3. The con
injection pump is effected. The improved mecha-. trol rod IT is reduced in diameter for a portion of
nism is compact in design, takes up little space ,its length to form a recess I8, its end I1“ having a ’
and is very reliable in operation and- as well is at close sliding ?t in the bore 19 of the piston rod
35 all times thoroughly lubricated by the pressure 20 forming a sliding control valve. The hollow ._
piston rod 20, which is supported in a bearing 22
feed oil which, under the control of the centrif
ugal-governor, effects the displacement of the in the closure head 9, has its recess I8 at all times
overlapping and therefore in communication with
“The invention will be more ‘fully explained vradial ports'25 in the tubular piston-rod, such
40 hereinafter with reference to the-accompanying ports being also in communication through the
drawing in which it is illustrated, and in which: elongated channels 23 with the radial channels
Figure 1 is ‘a view in longitudinal section of a 24 and therefore through the annular channel 8
and the longitudinal channel ‘I of the sleeve 4,v
mechanism which embodies the invention.
piston and therefore of the. driving gear of the
injection pump, with respect to the rotation of the
30 cylinder and its driving shaft, and a lead or lag
Figure 2 is a view in transversesection on the
45 plane indicated by the broken line 2-2 of Fig
in communication with the oil inlet 6 from the
oil pressure pump. The hollow piston'rod 20 is
also provided,"as at 21, with radial ports which
1, and
Figure 3 is a detail viewwin elevation of the are in communication externally with the cylin
device by which the interconnection between the der space 28 and internally with elongated chan
nels 26 so that as the control rod I1 is moved to e
servo-piston rod and the servo-cylinder is ef
the left,‘ the‘ cylinder space 28 willbe placed in _
50 fected.
In Figure 1 there is shown at I a gear from communication with the bore I9 of the hollowv
which is driven the injection pump. The latter piston rod to the right of the sliding valve I15, 01', .
may be of any usual or suitable construction and as the sliding valve II3 is moved to the right, the
need not be shown herein. The gear I is shown ' cylinder space 28 will be placed in communication
55 as secured to the ?ange 2 of the servo-cylinder 3 with the recess I8 and so, through the channels
23, the ports 25 and the channels 24, with the
| and an advance in the time of fuel injection
The movement of the piston toward the right
continues until the communication between the
channels 25 and H! is interrupted, when the
annular channel 8 and the longitudinal channel 9
and the oil inlet pipe 6.
The rod 20 of the servo-piston 2| is formed at
the other'side of the servo-piston 2| with, an
servo-piston again assumes-{with} reference to
enlarged "sleeve-like displacement member 29', the control vvalve ll, theposition shown in Fig
which is formed with longitudinal radial bosses
ure 1.
30 in the form of sectors of a cylinder each of '
When the speed of rotation of the engine de
creases the cohtrol valve i1 is shifted to the left
which is formed on its outer face with right an
gled, sharply pitched, spirally disposed threads
3| which engage corresponding sharply pitched,
in Figure 1, the cylinder space 28 is placed in
communication with ‘the bore IQ of the piston
spirally arranged grooves ?ve-formed in the-inner, rod through the channels 26 and 21 and the
surface of the servo-cylinder 3. The engine pressure oil in :thev'c'ylinder space 28 can then
shaft 35 by which the injection pump is actuated escape through thechannels 4|. The oil pres
through the mechanism described and, through sure being thus released the spring 36 shifts the
the gear |, is forked at its end, the forked mem
piston 2| to the left and thereby, through the
bers 34 embracing the enlarged sleeve-like mem
connections described above, the cylinder 3 and
ber 29 of the servo-piston rod 29 and engaging the engine shaft 5_ are displaced‘, in a‘ rotary
the‘r'adial bosses fi?j vthereof so that the piston
rod is'lrotated- with the shaft-35, but with capac
ity 'fo‘rrelative' longitudinal 3' displacement. So
_ also the servo-cylinder 3 isfr'otated with the shaft
" 35 ‘but, with a relative leader drag as determined
sense and a lag in'relative ‘rotation:
' z '
the shaft 35 and ‘the gear "If is 'occas .on
,_ ,9,’d f
lag being continued until the lpis‘to'n'2l ' ‘agai
control valve i1, asf's'hown'in 'Figurejl
by" the ‘relative: lc'angitudinalv displacement of the
servo-piston 2| therefpre?follows every,
ment of the'g‘centri'fugal weightsf‘ofhthegove o
“Within ‘the ‘chamber of the‘ enlargement 29 r effecting a relative rotary‘ displacement as " v
: there is-placed a‘ reaction ‘spring 36 which bears tween the engine shaft l?xaind'thegear ‘I, with
at one end'against ‘a shoulder of the piston rod
20 and at the‘ other end against the end of the
driving shaft 35. The servo-cylinder 3 is itself
held without; capacity for longitudinal displace
ment within the bearing sleeve4 vby a cap nut
‘31 and the driving’ shaft“ is held without capac
a consequentand corresponding "less-013mg‘, i '
point of time, jof'gtheminjgectio‘n" ofl?fuel?foiljvinto.r
the engine cylinder.
It will be noted ithatl'lth‘e
actance spring 36 and,‘ the‘regulatingf’devices
ity for longitudinal displacement by engagement ture with the pump‘ gear |_','the‘end closure ‘S‘of '
of,» the‘cap nut with the shoulder 38 and the ' the cylinder 3‘ serving as‘ a carrier for the" cen;
closure disc‘4ll. Longitudinalchannels 4| are
provided v‘in‘th'e hub of the shaft 35 for the dis.
-, chargeofv used pressure oil."
' _' ‘As will be understood-the centrifugal weights
|3Yof the governor assume, for every speed of
rotation of the'govern'or and of the gear I, a
‘certain de?nite position in which the'centrifugal
jlweightsv ‘and ‘the spring l2 are in equilibrium.
For every speed‘ of rotation the control valve ll“,
~trifugal governor‘ 12, ",they
rod ll,
19f ,LW'Iiiéh.
The improvedrnechi‘ ‘
serves as a control‘valve.
I anism has therefore'?‘a"verylsnialllspace ‘réouire
ment, presents a minimum number'claf‘zwork'ingi'v
joints and is at ‘all times well lubricatedbyvthe
employment of lubricating‘: oil as"the‘pres‘jsure§ ‘v
?uid which acts upon the servo-pistonlf 4' ‘ >
I claim as my invention;
1. In a mechanism i‘or ‘changing; thejle'phase"
l8, therefore also assumes a definite position. ~ relationship between a driven-shaft‘and‘a drivl
ing gear, the combination off-a driven shaft,"a _
In. the position-'of-the parts shown in Figure 1
the: servol-piston *has' assumed ‘a position corre
‘ sponding? to the position of the control valve H,
l1“, l8 in which‘the cylinder space 28 is closed
r ,from‘communication and ‘the lubricating oil or‘
other ‘?uid therein‘being'in‘ equilibrium with the
tension _‘of>the spring 26 the servo-piston 2| reé
mains ‘at rest in that position. ‘ If then the speed
driving gear, a servo-cylinder rotatable ‘withfthe j
gear and spirally groovedv'internally, a servo; ‘ i -
piston,‘ a displacement member rotatable and ’
movable longitudinally with the servo-‘piston and
spirally threaded toengagetheg‘rooves of the‘.
servo-cylinder, means to supply fluid under pres-'
sure to the cylinder space to move ‘the piston ‘in
of rotation of the governor is increased the cen- ' one direction, a reactance spring acting in op- '
trifugal weights ~13 ?y outward and thegcontrol?
valve I'IQI‘I', I8 is shifted to "the right. There
by the cylinder vspace ;28 is placed in communi
-cation,‘through the channels 26, 21 with the re
cess i8 and, through the channels 25, 23, 24, I,
and 1,1with the pressureoil line- 6 of" the' oil
position to the ?uid pressure, a‘centrifugal' govf 55
ernor,'means actuated by the governor to con-'
trol the movement of pressure. ?uid to and from
the cylinder space, and means whereby the servo- ;
piston ‘is coupled‘to the driven shaft to ‘be"'roi- "
pumps" The oil-pressure against‘ the servo-piston
tated thereby with freedom“ for ‘longitudinal " dis to
2| ‘is thereby increased-and‘the piston is moved
2. A mechanismfas
h ‘
_, ‘g Land
toward’ the i right against‘ the ‘pressure‘ of the ' in which an extension of the piston rod is formed~
spring-'36. The‘ relative longitudinal ‘movement
' ‘of the’ piston 2| with respect to the cylinder 3
and the' consequent‘relative longitudinal move
ment of the threads 2|‘ in the grooves of the
cylinder 3 causes av relative rotary'displacement
of the {cylinder 3' and they shaft 35 and a conse-‘
70 quent leadof the shaft 35
relation to the gear
with‘ radial longitudinal bosses and the‘drive‘n“.
shaft is forked-at its end to'embrace' and en-_ 65
gage the piston rod, whereby the piston iis ro-f"
tated with capacity for longitudinal displace
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