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Патент USA US2110428

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March 8, 1938.v "
2,110,428
P. SIMONDS
SECTiONAL DRIVE
Filed July 6, 1936
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IINVENél'EIR
PAUL SIMDNDS
BY
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A'r-rnnwpv.
Patented Mar: 8, 1938
. 2,110,428,
UNITED .“STATES
PATENT ‘OFFICE
2,110,?8
SEO'I'IONAL DRIVE
_
Paul Simonds, Milwaukee, Wis, assignor to The
Oilgear Company, Milwankcc, Wia, a corpora‘
-tion of Wisconsin
Aimlication July s, 1936. Serial No.89...”
11 Claims.
(01. 60-53)
placement varied in response to variations in the '
This invention relates to drives of the'type
employed to drive a group of related machines
'drop in pressure across its helper motor.
or the several units or sections of a single ma
The invention is exempli?ed by the drive shown
schematically in the accompanying drawingin
chine, such as ‘a paper machine, printingpress
5 or the like. The torque required to start such
which the views are as follows:
5
and shows the relation between the several parts
of the drive.
Fig. 2 is a section through one of the motors, .
having a capacity considerably in excess of the
the view being somewhat diagrammatic in char- 1o
acter and showing the displacement varying
mechanism considerably enlarged in respect to
10 power required to keep the machine or group of
machines running after being started.
The present invention has as an object to pro
' vide a sectional drive which will maintain the
the motor.
- -
The drive may be provided with any number of
sections but, for the purpose of illustration,‘ it 15
has been shown-provided with three sections A,
B, and C to drive, respectively, three related ma
speeds of the several machines or machine units
driven thereby proportional to each other.
Another object is to provide a drive in which
a plurality of hydraulic motors may be driven by
liquid supplied thereto from a single source and
the speeds of the several motors maintained pro
2O
1
Fig. 1 is a diagram of, the hydraulic circuit I
a machine or group of machines is often as much
as twice the running torque so it is ordinarily
necessary to drivev the same from a power plant
chines or three units I, 2, and 3_of a single ma- '
chine.
I
Another object is to provide a drive which may
be adjusted to vary the speed of one or more of
its sections relative to the speed of one or more
Each drive section includes a variable displace- 2o
ment hydraulic motor 4 and a second hydraulic
motor 5 which are mechanically connected to
each other and to the machine to'be driven. Mo
other sections in order to provide draw between
machine units driven
and shown as being considerably larger than mo- 25
portional to each other.
-
~
,
tor 4 has been designated as the "main” motor
25 adjacent machines or
thereby.
' tor 5 which has been designated as a "helper"
Another object is to provide a sectional drive ' motor but such proportions are not necessary
which will enable a. prime mover to drive a group for the reason that the two motors may be of the
same or of di?erent sizesvas long as neither motor
> of machines vor machine units at proportional
30 speeds and which may be adjusted to vary the is capable oi’ driving both the machine and the 30
,
'
overall speed of the group without changing the other motor.
ratio between the speeds of the individual ma- '
speed at which the drive is driven by the prime
mover.
W
‘
'
The motors of each section may be connected
in any suitable manner to each other and to the
machine to be driven by that section, as by means
chines or machine units and without varying the
.
Another object is to provide a sectional drive
of a drive 6 which connects motor 4 to the ma- 35
chine and a drive ‘I which connects motor 5 to
which will permit a group of machines or ma
chine units to be started and ‘driven by a power
motor ,4.
plant of considerably smaller capacity than the
thereto from a common source such as a pump III
of the constant pressure type. Such a pump has 40
40 power plant heretofore required to start and
>
‘
Liquid for driving all of motors l is supplied
drive a similar group of machines or machine
the characteristic of delivering liquid at its full
units.
Other objects and advantages will appear from
the description hereinafter given of a hydraulic
drive in which the invention is embodied.
According to the invention in its general as
volumetric rate until pump pressure reaches a
predetermined maximum and then automatically
reducing itsv displacement until it is delivering
just sumcient liquid to maintain that maximum 45
pressure substantially constant. Since pumps 0!
pect, the drive is divided into several sections each
of which includes a variable displacement hy
this character are well known and in extensive ,
draulic motor and a hydraulic helper motor which ~
Pump Ill delivers its output through a channel ‘
-i I into a supply channel I! having three branches 50 .
each of which is connected to the intake port of '
50 are mechanically synchronized, all the helper
motors are hydraulically connected in series and
supplied with motive liquid from a single source,
the variable displacement motorsfare supplied
with motive liquid ‘from a di?erent source, and
55 each variable displacement motor has its dis
use, no further description thereof will be given.
amotor 4. Liquid is returned to pump ill from
motors I through a return channel l3 which con
nects the intake of pump III to a return channel
»
I‘ having three branches each of which is con- 14‘:
2,110,490
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_
J
_
.
nected to the outlet of a motor 4.- All of the I
with motive liquid. Since pumps and motors of
motors 4 are thus connected to pump ill in paral
this type are well known and ‘in extensive com
mercial use, no further description thereof will
- lei with each other.
Liquid for operating motors 5 is supplied there
begiven.
to by a variable displacement pump H which has
its outlet connected to the inlet of motor ‘of
section A by a channel It and its inlet connected
to the outlet of motor 5 of section C by a channel
i9. The outlet, of motor 5 of section A is con
'10 nected by a channel 23 to the inlet of motor 5 of
section B which has its outlet connected by a
‘
‘_
-
' Slide block 43' is urged toward a‘zero dis
placement position by a substantially constant
force such as a spring or, as shown, by means of
a piston -44 connected to slide block 43 and fitted
in a stationary cylinder 43 which is ordinarily
carried by the pump casing and ~to which‘ liquid is
10'
supplied at a constant prwsure by gear pump 23.
channel 2| to theinlet of motor 5 of section C. - To this end, each cylinder 45 is connected to a
All of motors 5 ‘and pump I‘! are thus connected
in series with each other and each is preferably
15 provided with means for varying the ‘displacement
thereof.'such as the stroke changing mechanism
shown in Patent No. 1,998,984 and indicated in
Fig. l by a hand wheel 22.
'
‘
- Pumps II and H are shown as being arranged
upon a base 24 and driven in unison by an elec
tric motor 2! arranged thereon. Base 24 may be
hollow and contain a supply of liquid for pumps
i0 and I1.
.
\
'
Liquid for supercharging pumps l0 and I1 and
for control purposes is supplied by an auxiliary
pump such as a gear pump 23 which may be in
corporated in one of the pumps and driven in
unison therewith according to the usual practice
but which has been vshown as being driven by
motor 25 through a drive 21.
'
.
Gear pump 23 has its intake connected by a
channel 28 to the interior of base 24 and its
outlet connected'by achannel 29 to, channel I 4
intermediate the ends thereof. Liquid discharged
by gear pump 29 in excess of the volume required
for control purposes and to make up for leakage
losses is discharged through'a suitable resistance
to enable gear pump 23 to maintain pressure in
- the return sides of the circuits of pumps in and IL
40
A single resistance valve may be employed for
' this purpose but, in order to keep the two circuits
independent of each other, the drive is shown pro- _
vided with a resistance valve 39, which has its
inlet connected to channel l4 intermediate the
.45 ends thereof and its outlet connected to one end
of a channel 3i, and a resistance valve 32 which
has its inlet connected to the'other end of chan
nel 3| audits outlet connected to 'a drain channel
33 which discharges into base 24. Channel 3| is
50 connected intermediate the ends thereof to chan
nel l9 intermediate the'ends thereof by a channel
34. Gear pump 23 is thus enabled to maintain in
channel l4 a pressure equal to the combined re
sistances of valves 33 and 32 and to maintain in
.55 channel I! a pressure equal to the resistance
valve 32.
.
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‘
v
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_ Themotprsl 4 may be of any suitable .type such
as the rolling piston type shown in Patent No.
1,998,984. A: hydrodynamic machine of this
character has its-pistons and cylinders ‘arranged
in a rotatable cylinder barrel 40 (Fig. 2) which is
journaled upon a stationary valve shaft or pintle
4| through which liquid ?owsto and from the
cylinders. The outer ends of the pistons engage
‘as
an annularreaction surface 42 formed upon the
inside of a slide block 43 in which cylinder barrel
40 is arranged.
'
when reactionsurface 42 and cylinder barrel
49 are concentric with ‘each other, motor displace
'70 ment is zero and motor 4 will remain idle. When
slide block 43 is shifted so that reaction surface
42 is eccentric to cylinder barrel 40, motor dis
placement will be proportional to the 'distance
branch of channel i4 by a channel 43 so that 'a
pressure equal to vthe combined resistances of
valves 30 Land 32 prevails in each cylinder 4! 15
whenever the drive is in operation.
a
‘Slide block 43 of the motor ,4 in each drive sec- '
tion is adapted to be moved toward maximum dis
placement position in response to variations in the
drop in pressure across the motor 5 of the same
section. For the purpose of illustration, each
motor 4 is shown provided with an actuator II
which has its casing connected to or formed in
tegral with- the casing of. motor 4 and which is
shown in detail in Fig. 2.
.
Actuator so is provided with a‘ piston n which ‘
is connected to slide block'43 and adapted to be
operated by liquid under the control of.a valve 52
which is shown on a considerably enlarged scale in
respect to the motor. Pistons 44 and ii are also
shown on an enlarged scale in respect to the
motor.
'
.
,
Piston ii is fitted in a cylinder l3 which is
formed-in the actuator casing and connected by a
port 54 to a bore 55 which is formed in the ac
tuator casing at right angles to cylinder 53 and has
valve 52 arranged therein.
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'
Valve 52 ‘is provided with a centralhead or
piston 56, which normallyvcovers port 34, and two
end heads or pistons 51 and 53 which are spaced 40
from valve piston 53. All three of the valve pis
tons are closely fitted in bore ‘I to reciprocate
- therein.
-
_.
Liquid for operating piston 3| may be supplied
to cylinder 53 from any suitable source such as 45
from gear pump 26 by means of a channel ll hav
ing one of its ends connected to channel l4 and
its other end connected to the actuator casing in
communication with bore 5! at a point which re
mains between valve pistons 33 and 31 in all posi
tions of valve 32. Valve piston “controls com
munication between port 84 and channel I3 and
also between port 54 and a drain channel 33 com
municating with bore 33 at a point which always
remains between pistons 59 and 33 in all positions 55
of valve ‘I2.
.
In order that valve 32 may be operated in re
sponse to variations in the drop in pressure across
motor I, the upper end of bore II is connected to '
the intake side of motor 5, the lower end of bore
55 is connected to the discharge side of motor I,
and valve 52 is urged upward by a spring 33 which
is arranged in the lower end of bore 3! and has is
tension adjusted by a screw 34. As shown, ‘ac
tuator 59 of section A has the upper end of its
bore SI connected to channel II by a channel 35
and the lower end thereof connected to channel
29 by a channel 33, actuator 33 of section B has
the upper end of its bore ,35. connected to.chan
nel 29 by a channel 31 and the lower end thereof 70
connected to channel 2| by a channel Cl, and
actuator 53 of section 0 has the upper end of its
bore 35 connected to channel 2i by a channel 03
slide block 43 is shifted from its zero displacement
and the lower end thereof connected to channel
position and motor 4 will operate when supplied
llbyachannel‘ll.
'.
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75
3
2,110,423
drive ‘machine units I, 2, and 3 without the aid
The arrangement is such that the pressure pre
vailing at the intake of motor 5 and acting on
valve piston 51 urges valve 52 downward against
the upward forces exerted upon valve piston 58
by spring 63 and by the pressure prevailing at the
outlet of motor 5. Spring 63 has its tension so
of motors 5. , Also, some of the motors 4 will have
reduced torque due to those motors having been‘
adjusted to short stroke as will presently appear.
Consequently,“ the pressure in the circuit has $1
dropped, pump III will deliver'liquid at its full
volumetric rate until pump pressure reaches. the
predetermined maximum and then it will reduce
its displacement until it is delivering just sum
adjusted that it will support valve 52 in such a
position that valve piston 56 covers ports 54 when’
- the pressure drop across motor 5 is normal.
Tha
cient liquid to maintain that maximum pressure
10 is, with valve piston 56 in position to cover port
54, the force exerted by spring 53 is just equal to
the difference between the forces exerted by the
' liquid upon valve pistons 51 and 58 when motor 5
15
is carrying its normal share of the load.
Since the motor 4 of each drive section is driven
by liquid supplied thereto at a constant pressure,
the force exerted by it will remain constant as
long as its displacement remains constant.
substantially constant.
Therefore, any variation in the load on the drive
20 section will cause a corresponding variation in
the load on the motor 5 of that, section with a
resultant variation in the pressure of the liquid
delivered to that motor 5 for the reason that liq
‘uid is delivered theretox at a constant volumetric
25
rate.
‘
-
When motor 25 was previously deenergized to
stop the apparatus, the inertia of the machine‘
‘units I, 2, and 3 drove or tended to. drive the mo
tors 4 and 5 and reversed the pressure in each
circuit, thereby permitting springs .63 to raise
valves 52 to open ports 54 to drain channels 60 so
that when gear pump 26 was started, liquid dis
charged therefrom could enter the cylinder 45 in
each of sections B and C and reduce the displace 20
ment of the motors 4 of those sections to mini
mum displacement.
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Gear pump liquid would also tend to reduce the
displacement of motor 4 in section A but, since
the pumps are all started at the same time, pump 25
‘x,
If the load should increase, the pressure at the
intake of motor 5 would increase and cause valve
I‘I will deliver liquid to motor‘ 5 of section A which
will attempt to start machine unit I but cannot
do so at ?rst due to the static friction and inertia.
thereof. Consequently, pump I'I will raise a high
52 to be depressed until port 54 was opened to
channel 59. Then liquid from gear pump 26
pressure in channel I8 ‘and this pressure will ex 30
30 would enter cylinder 53 and move slide block 43
tend through channel 65 and move valve 52 /
toward the right and thereby increase motor dis
placememt) until motor 4 could carry enough of v downward to open port 54 to channel 59 so that
the addit nal load to reduce the load on motor 5 gear pump liquid willenter cylinder 53 and move
until the drop in pressure across motor‘ 5 was slide block 43 toward maximum displacement po
reduced to normal. Then the forces exerted upon sition, thereby causing motor 4 to exert a high
valve piston; 58 by the liquid and by spring 63
torque which, together with the torque exerted
would raise valve 52 until valve piston 56 covered
by motor 5, is ample to startvmachine unit I.
As soon as section A starts to operate, the liquid
port 54 and trapped the liquid in cylinder 53 to’
hold piston 5| and slide block'43 in their new discharged from the. motor 5 thereof will ?ow
' ‘through channel 20 to motor 5 of section B and
‘_
40 positions.
If the load should decrease, the pressure at the
intake of motor 5 would ,decrease and permit the
forces exerted upon valve piston 58 by the liquid
and by spring 63 to raisevaive 52 until port 54
was opened to drain channel 60. Then liquid
could escape from cylinder 53 and permit ‘liquid
from gear pump 26 to enter cylinder 45 and move
'
attempt to start it but cannot do so due to the
static friction and inertia of machine unit 2,
Consequently, the pressure in channel 20 will rise
and liquid will ?ow through channel 61 to actua-i
tor 50-of section B and move its valve 52 down 45
ward, thereby permitting gear pump liquid to
move slide block_43 toward maximum displace-
piston 44 and slide block 43 toward the left and \ment position until motor 4 of section B is exert
thereby decrease motor displacement until motor ing a high torquewhich, together with the torque
exerted by motor 5, is ample to start machine 50
M v 4 would be carrying a smaller share of the load
‘
and causing the load on motor 5 to be increased unit 2. I
until the drop in- pressure across mptor 5 would "
increase to normal. Then the increased pressure
As soon as section B starts to operate, the liquid
discharged from the motor 5 thereof will ?ow
through channel 2| and cause section C to start
at the inlet of motor 5 would cause valve 52 to
move downward until valve piston 56 covered
port 54 and trapped the liquid in' cylinder 53 to
hold piston 5| and'slide block 43 in their new
machine'unit 3 in the same manner that section 55
B started machine unit 2. If the drive had more
positions.
be ‘successively started in the same manner;
Since it is sometimes desirable to operate one
60 or more sections of the drive while one or more .
other sections remain idle, a bypass valve is con
nected across the helper motor *of each section.
As shown, a normally closed valve 13 is connected
between channels I8 and 20, a similar valve 14 is
connected between channels 20 and 2| and a
than three sections, the additional sections ‘would
The displacement of pump I1 is preferably
reduced, as by turning the hand wheel 22 thereof,
before motor 25 is energizedso that pump I‘!
when started will at ?rst deliver liquid to motors‘
5 at a. reduced rate and thereby cause the drive
to operate at slow speed. After the drive has
been started, it may be accelerated to the desired
similar valve ‘I5 is connected between channels . speed .by'increasing the displacement of pump IT.
2| and I9.
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Assuming that the drive is idle, that it has but
three sections, and that valves ‘I3, ‘I4, and ‘I5 are ,
v70 closed, the drive will operate as follows:
When electric motor 25 is energized, it will drive
pumps I0, I1, and 26 which will deliver liquid into
channels II, II, and 29 respectively. Pump III
will attempt to drive all of the motors 4 but can
not do so as they do not have suilicient power to
Since the several machine units are started suc
cessivelyand at slow speed, it is not necessary
that electric motor 25 and pumps‘ l0 and I1 have
the power capacity that would be required if the
‘units were started simultaneously as‘ in the prior
drives.
,
-As-soon as a unit is started, less torque is re
quired and, as soon as it has been accelerated to
its running speed, still less torque is required.
4
2,110,498. '
Since motor 4 is supplied with liquid at a sub
~stantially constant pressure, it exerts a substan
tially constant torque as long as its displacement
remains unchanged. Consequently, any decrease
‘ in the requiredtorque is ?rst ielt'by motor I with
5
'a resultant drop in pressure at its inlet. This
drop in pressure at the inlet of motor I causes
actuator II to operate and eiiect a decrease in
the displacement of motor 4 in the previously de
10 scribed manner until each of motors 4 and I
is carrying its predetermined share of the load
as determined by the adjustment of spring 63.
I.‘ the ratios of drives 6 and. ‘I and the dis
placement of motor I in one section are exactly
15 the same, respectively, as theratlos of drives‘ 6
and ‘I and the displacement of motor I in each
of the other sections, all of the'machine units
will be driven at the same speed for the reason
' that motors I are connected in series and must
go operate ‘at the same speed, any variation in load
which might cause a variation in the speed of any
unit being compensated for by adjustment of
motor 4 as previously explained.
‘_
If it is desired toincrease or to decrease 'the
25 overall speed of the drive, the displacement oi
pump i1 may be increased or decreased. If it
is desired to vary the speed of one unit relative
to the speed‘of. another unit for the purpose, for
example, of compensating for the stretching or
shrinking of the material being processed by the
several units, it is simply necessaryto vary the
displacement of motor I oi'that section as by
adjusting hand'wheel 22. It the displacement
oi’ motor I oi! one section is decreased, the speed
' oi’ the unit driven by that section .will be in
creased and, conversely, if its displacement is
increased the- speed oi’ the unit will be decreased
for the reason that pump 11 delivers liquid to
motor I at a constant volumetric rate.
When the drive is stopped, .as by deenergizing
40
electric motor II, the machine’ units driven by
the'drive may have su?lcient inertia to drive
motors 4 and I, thereby causing motors 4 and]
to function as ‘pumps and-tend to drive pumps
II and I1 and electric motor II the resistance
of which would cause a reversal of pressure in
the circuit.
lithe machine should drive motors 4 and I and
no preventative means were provided, motors 4
50
and I would discharge through resistance .valves
ll and I! and thereby cause a deilciency oi liq-’
uidinthecircuitunlesstheresistancevalveswere
adjusted to open at a pressure higherlthan the
pressure required‘to drive pumps II and ii.
In order toprevent such a de?ciency of liquid
and to avoid the necessity of maintaining a rela
tively high prusure in the return side 01' each
circuit,_there may be provided between channels
II and it a resistance valve ‘II which is adjusted
to open at a pressure lower than the pressure re-
quired to open resistance valve 82, and between
channels it and i4 a resistance valve 11 which
_isadjustedtoopenatapressurelowerthanthe
would cause pressure to be created in channels
is, II, and 20 andthis pressure would extend into
the lower‘ ends of actuators I0 and raise the
valves I2 thereof to open each cylinder II to‘
drain pipe 60.
5
The liquid discharged by motors 4 would ?ow
from channel l4 into channel I! through resist
ance valve ‘II which would cause pressure to be
maintained in channel l4 and this pressure would
extend through channels 48 into cylinders 4I and
cause pistons 44 to move slide blocks 43 toward
the left until motors 4' were at zero displacement
or, if desired, to a predetermined minimum dis
placement in which case resistance valve ‘I1 would '
also function as a brake to decelerate the ma 15
chine units.
_
The invention herein set forth is susceptible
of various modi?cations and adaptations with
out departing from the scope thereof as here- 7
20
after claimed.
The invention is hereby claimed as follows:
1. A sectional drive, comprising a series of drive
sections each including a variable- displacement
hydraulic main motor and a hydraulic helper
motor mechanically connected to each other, 25
means for‘ supplying motive'liquid to said main
motors'at a pressure not‘ exceeding a predeter
mined maximum, ,a pump for supplying motive
liquid to said helper motors, ?uid channels con
necting said helper motors to said pump in se 80
ries withpeach other, and means responsive to
variations in the drop‘ in pressure across each
helper motor for varying the displacement of the
main motor connected thereto.
2. A sectional drive, comprising a series of 35
drive sections each including a variable displace
ment ‘hydraulic main motor and a hydraulic
helper motor mechanically connected to each
other, means for supplying motive liquid to said
mainmotorsatapressurenotexceedingapre-,‘o
determined maximum, a pump for supplying mo
tive liquid to said helper vmotors, ?uid channels
connecting. said helper motors to said pump in
series with each other, means responsive to varia
tions in the drop-.in pressure'across each helper 45
motor for varying the-displacement oi the main
motor connected thereto, and means for varying
the displacement‘ 01' at least one helper motor to
thereby vary the speed 0! the drive' section con
taining
that motor relative to the speeds 01' other
..
drive sections.
'
3. A sectional drive, comprising a series of
drive ‘sections each including a variable displace
ment hydraulic main motor and a hydraulic
helper motor mechanically connected to each
other, means tor supplying motive liquid to said
main motors at a pressure not exceeding a pre
determined maximum, a pump for supplying mo
tive liquid to said helper motorsp?uid channels
connecting said helper motors to said pump in
series with each other, means responsive to ‘variations in the drop in pressure across each helper
motor for varying the displacement oi.’ the main
motor connected thereto, and means for varying
pressure required to overcome the combined re ' the displacement oi ‘ said pump to thereby vary
sistances of valves SI and 32. Valves ‘II and ‘II the speeds or all of said drive sections.
.5 would‘ permit liquid to ?ow from channel ll_'to - 4. A. sectional drive, comprising a series oi’
channel II and from-channel [4 into channel I! drive sections each including a variable displace
but would prevent it from ?owing in the opposite. ment hydraulic, main motor and a hydraulic
helper motor mechanically connected to ‘each.
Then when motors 4 and I were driven by the other, means for sumilying motive liquid to said 70
70
direction.
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machine units, the liquid discharged by motor I - main motors at a pressure not exceeding a pre
‘oi seetionvC would ?ow through channel ll, re-‘ ‘determined maximum, a pump for supplying
sistance valve ‘Wand channel II to motor I of
section As Resistance valve ‘II would function
motive liquid to said helper motors, ?uid chan
nels connecting said helper motors to said pump
Iahahtodaceleratetbamachineunits‘and inseries witheachothenmeansresponsivoto’
2,1 10,488
variations ‘in the drop in pressure across each
helper motor Iorvarying the displacement of the
main motor connected thereto, means for vary
- ing the displacement of at least one helper motor
5.
motors when supplied with motive liquid at or
below said maximum pressure having insumcient
power to drive the unit to which it is connected, ‘
a pump for supplying motive liquid to said helper
to thereby vary the speed oi: the drive section
motors, ?uid channels connecting said helper
containing that motor relative to the speeds “of
other-drive sections, and means'for varying the
motors to said pump in series with each other,
means responsive to variations in the drop in
pressure across each helper motor for varying
the displacement of the main motor connected
thereto, means for varying the displacement of 10
at least one helper motor to thereby vary the
displacement of said pump to thereby vary the
speeds 01’ all of said drive sections.
5. A sectional drive for a series of machine
10
units, comprising a drive section for driving each
> unit and including a variable displacement hy
draulic main motor and a hydraulic helper motor
mechanically connected to each other and to said
15 unit, means for supplying motive liquid to said
main motors at a pressure not exceeding a pre
determined maximum, eachooi said main motors
when supplied with motive liquid at or below said
maximum pressure having insu?icient power to
vspeed of the drive section containing that motor
relative to the speeds of other drive sections, and
means for varying the displacement of said pump
to‘ thereby vary the speeds of all of said drive 15
sections.
,
,
,
9.'A sectional drive for a series of machine
units, comprising a drive section for driving each
unit and including a variable displacement hy
20 drive the unit to whichlit is connected, a pump draulic main motor and a hydraulic helper motor 20
"-for supplying motive liquid to said helper motors, mechanically connected to each other and to
?uid channels connecting said helper motors to said unit,'a constant pressure pump, ?uid chan
said pump in series with each other, and means nels connecting all of said main motors to said‘
responsive to variations in the drop in pressure ' pump in parallel with each other. a second pump,
?uid channels connecting said helper motors to 25
25 across each helper motor for varying the dis
placement ot-the main motor connected-thereto. said secondpump in series with each other, and
6. A sectional driveior a series 01'. machine ' means responsive to variations in the dropvin
- units, comprising a drive section for driving each‘ pressure across each helper motor ‘for varying
the displacement of the main motor connected
unit and. including a variable displacement hy
30 draulic main motor and a hydraulic helper motor
30
10. A sectional drive for a series of machine
mechanically connected to each other and to
said unit, means for supplying motive liquid to units, comprising a drive section for driving each
said main motors at a pressure not exceeding a unit and including a variable displacement hy
predetermined maximum, each of said main draulic main motor and a hydraulic helper mo
35 motors when supplied with motive liquid at or tor mechanically connected to each other and to
thereto.
. below said maximum pressure having insui?cient
power to drive the unit to which it is ‘connected,
9. pump for supplying motive liquid to said helper
motors, ?uid channels connecting said helper
'
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_
said unit, a constant pressure‘ pump, ?uid chan
nels connecting all of said main motors to ‘said
pump in parallel with each other, a second pump.
?uidchanneis connecting said helper motors to .
40 motors to’said pump in series with. each other, » said second pump in ‘series with ‘each other, 40
means responsive to variations in the drop in means responsive to variations in the drop in
pressure across each helper motor for varying the ' pressure across each helper motor .for varying
'displacement of the main motor connected there
to, and means for varying the displacement of at
least one helper motor to thereby vary the speed
of the drive section containing that motor rela
tive to the speeds of other drive sections.
7. A sectional drive for a series‘ of machine
the displacement of the main motor connected
thereto, and means for varying the displacement
of each helper motor to thereby vary the speeds 45
of said drive sectionsv relative to each other.
'
11. A sectional drive for a serieslot machine
units, comprising a drive section for driving each
units, comprising a drive section for driving each “unit and including a variable displacement‘ hy
60 unit and including a variable displacement hy
draulic main motor and a hydraulic helper motor
' mechanically connected to each other and to said
unit, means for supplying motive liquid to said
'main motors at aipressure not exceeding a pre
65 determined maximum, each 'of said main motors
when/supplied with motive liquid at or below said
maximum pressure having vinsuf?cient power to
drive the unit to which it is connected, a pump
for supplying motive liquid to said helper motors,
60 ?uid channels connecting said helper motors to
said pump in series with each other, means re
sponsive to_variations in the drop in pressure
draulic main motor and a hydraulic helper motor, 50
mechanically connected to each other and to
said unit, a constant pressure pump, ?uid chan
nels connecting all of’said main motors to said \
pump in parallel with each other, a second pump,
?uid channels connecting said helper motors to 55
said ‘second. pump in series with each other,
‘means responsive to variations in the drop in
pressure across each helper motor for varying
the displacement of the main motor connected _
thereto, and means for varying the displacement 60
of said second pump to thereby vary the ‘speeds
. of ally of said drive sections.
across‘ each helper motor for varying the dis
12. A sectional drive for a series of machine
.p'lacement oi the main motor connected thereto, ‘ units, comprising a drivesection-Ior driving each
and means for varying the displacement or said a unit and including a variable displacement by 65
pump to thereby vary the speeds of alloi.r said draulic main motor and a hydraulic helper mo;
drive sections.
'
- '
tor mechanically connected to each other and .
8. A sectional drive /for a series of machine
to said unit, a constant pressure pump, ?uid
units, comprising a drive section for driving each
70 unit and including acvariable displacement by
said-pump in parallel with each other, a second
channels connecting all of said main motors to '
i draulic main motor and a hydraulic helper‘ motor
pump, ?uid channels connecting said helper moé
mechanically connected‘ to each other and to
.tors to said second pump in series with each
other, means'responsive to variations in the drop
in pressure across each helper motor for varying
said-unit, means for supplying motive‘ liquid to
said main'motors at a pressure not exceedingaa
predetermined maximum, each of said main
the displacement of the main motor connected 75
thereto, means for varying the displacement 01'
each helper motor to thereby vary the speeds oi!
said drive sections relative to each other, and
means for varyingrthe displacement of said sec
ondpumpto therebyvarythespeedsoiall or
said drive sections.
13. In a hydraulic drive, the combination of a
main hydraulic motor having an element shitt
able to vary motor displacement, means for ex
erting a substantially constant force upon said
element to urge it toward zero displacement posi
tion. displacement varying means for moving said
element. in the opposite direction against said
force, a helper motor
y connected to
said main motor to assist it in driving a load,
means for supplying motive liquid to each of
said motors to drive the same, and means re
sponsive to variations in the drop in pressure
across said helper motor for operating said dis
placement varying means.
14. In a hydraulic drive, the combination of a
main hydraulic motor having an element shift
able to vary motor displacement, means for ex- -
erting a substantially constant force upon said
element to urge it toward zero displacement po
sltion, displacement varying means for moving
said element in the opposite directionagainst
helper motor at a measured rate, means re
sponsive to variations in the drop in ‘pressure
across said helper motor for operating said dis
placement varying means, and means for varying
the displacement of said volumetric pump to 5
thereby vary the speeds of said motors.
16. In- a hydraulic drive, the combination of
a main hydraulic motor having an element shift
able to vary motor displacementrmeans for ex
erting a substantially constant force upon said 10
element to urge it toward zero displacement po
sition, displacement varying means for moving
said element in the opposite direction against
said force, a helper motor mechanically connect
ed to said main motor to assist it in'driving a lo
load, a constant pressure pump for supplying '
liquid to said main motor to drive the same, a
volumetric pump for supplying liquid to said
helper motor at a measured rate, means reg
sponsive to variations in the drop in pressure 20
across said helper motor for operating said dis
placement varying means, and means for vary
ing the displacement of said helper motor to
thereby vary its speed and the speed of said main
motor.
25
v1'1. In'a hydraulic drive, the combination oi! a
main hydraulic motor having an element shitt
said force, a helper motor mechanically con - able to vary motor displacement, means for ex
nected to said main motor to assist it in driving erting a substantially constant force upon said
a load, a constant pressure pump for supplying element to urge it toward zero displacement po- 30
liquid to said main motor to drive the same, a sition, displacement varying - means for moving
volumetric pump for supplying‘liquid to said said element in the opposite direction against said
force, a helper motor mechanically connected to K
helper motor at a measured-rate, and means re
7. sponsive to variations in the drop in pressure said main motor to assist it in driving a load, a
constant pressure pump for supplying liquid to 85
across said helper motor for operating said dis
placement varying means. _
_
.
15. In a hydraulic drive, the combination of a
main hydraulic motor having an element shitt
able to vary motor displacement, means for ex
erting a substantially constant force upon said
element to urge it toward sero displacement po
sition, displacement varying means for moving
said element in the opposite direction against
‘said force, a helper motor mechanically con
said main motor to drive the same, a volumetric -
pump for supplying liquid to said helper motor
atameasured rate,meansresponsivetovarl- _'
ations in the drop in pressure across said helper
motor for operating said displacement varying 40
means, means for varying the displacement of
said volumetric pump to thereby vary the speeds
of said motors, and means for varying the dis
placement of said helper-motor to thereby tur
nectrdtosaidmainmotortoasdstitindriving
thervaryitsspeedandthespeedotsaidmain
a load, a constant pressure pump for supplying
motor.
liquidtosaidmainmotortodrivethesamaa
volumetric pump for supplying liquid torsaid
'
‘
PAUL BIMONDS.
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