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Патент USA US2409188

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' Oct. 15, 1946.‘
v, v, BLASUTTA
I 2,409,185
HYDRAULI C APPARATUS
Filed June 19, 1943
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INVENTOR
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WcmRVBLAsUTTA
BY
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ATTORNEY
0d. 15, 1946.
v_ vT BLASUTTA
2,409,185
HYDRAULIC )APPARATUS
Filed June 19, 1945
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INVENTOR
VMJTQR V. BLASUT'EA
ATTORNEY
0145,1946,
v. v. BLASUTTA
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2,409,185
HYDRAULIC APPARATUS
Filed June 19, 1943
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VICTORVBLAsUTTA
06L 15, 1946~
v. v. BLASUTTA '
2,409,135
HYDRAULIC APPARATUS
Filed June ‘19, 1943
4 Sheets-Sheet 4
INVENTOR
‘
VICTOR V BLASUTTA
BY
WM 7/3’
41?“
TTORNEY 5/
Patented Oct. 15, 1946
2,409,185
UNITED STATES PATENT OFFICE
2,409,185
HYDRAULIC APPARATUS
Victor V. Blasutta, Columbus, Ohio, assignor to
The Deniscn Engineering Company, Columbus,
Ghio, a corporation of. Ohio
Application June 19, 1943, Serial No. 491,474
11 Claims.
1
This invention relates generally to hydraulic
equipment and is particularly directed to ?uid
pressure energy translating devices of the type
having rotatable cylinder barrels with movable
(Cl. 121-62)
2
- panying drawings wherein a preferred form of
embodiment of the invention is clearly shown.
In the drawings:
Fig. 1 is a vertical longitudinal sectional view
pistons and thrust means for imparting move
taken through a hydraulic motor formed in ac-,
ment to the pistons or cylinder barrels in the op»
cordance with the present invention showing the
eration of the devices.
thrust means thereof in condition to prevent op
An object of this invention resides in the pro
eration of the motor;
vision of a ?uid operated motor which will pro
Fig. 2 is a similar view showing the thrust
duce a substantially constant power but due to 10 means in condition to cause the motor to oper
certain adjustable elements therein will be capa
ate when ?uid under pressure is supplied there
ble of developing a variable torque in response to
changes in ?uid pressure caused by the applica
tion to or removal of loads from the motor.
Another object of this invention rests in pro
to;
.
Fig. 3 is a horizontal sectional view taken on
the plane indicated by the line 3-—3 of Fig. 1
15 showing the thrust means in condition to cause
viding a ?uid motor of the type mentioned with
operation of the motor;
‘
?uid pressure operated mechanism which is con
Fig. 4 is a detail sectional view taken through
nected with the thrust means and is subjected to
the means for automatically adjusting the thrust
the pressure of the ?uid in the supply line to the
member of the motor on the plane indicated by
motor whereby an increase in pressure on the 20 the line 4-4 of Fig. 1;
?uid in the supply line, due to the imposition of a
Fig. 5 is a vertical transverse sectional view
load on the motor, will be transmitted to the pres
taken on the plane indicated by the line 51-5 of
sure operated mechanism and will cause it to
Fig. 1; and
change the position of the thrust means so that
Fig. 6 is a similar view on the plane indicated
the torque of the motor will be increased and
by the line *6—6 of Fig. 1.
1
maintained until the load is relieved.
Referring more particularly to- the drawings,
A further object of the invention resides in the
the numeral 20 designates the motor in its entire
provision of a ?uid motor having a rotatable
ty. In the embodiment of the invention illus
cylinder barrel with a plurality of pistons and
trated, the motor 20 includes a casing 2i which
thrust means disposed at an angle to the longi
may be formed from cast metal and is generally
tudinal axes of the pistons so that when the lat
circular when viewed from the front. This cas
ter are forced by ?uid pressure toward the thrust
ing has angularly related front and rear walls
member the reaction produced by the angularity
22 and 23, the former of which is provided with
of the thrust member will cause the cylinder bar
an enlarged circular opening 24. This opening is
rel to revolve, the motor having means for sup
normally closed by a removable cover 25 which
porting the thrust member for pivotal movement
is suitably secured to the casing to permit ready
and means actuated by ?uid pressure to move the
removal, when necessary, to service the motor.
thrust member whereby the angular relation
thereof to the pistons will be changed to increase
In axial registration with the opening 25, the rear
wall of the casing is provided with an opening 25
which is smaller in diameter than the former
opening and is closed by a port plate 27 secured to
the rear wall of the casing by headed screws 23.
Both the port plate 21 and the cover 25 are pro
vided with ball bearings 29 and 30, respectively,
or decrease the reaction according to variations
in loads placed upon the motor.
Another object is to provide the ?uid motor
mentioned above with piston means for changing
the angularity of the thrust member, means also
being provided to balance the ?uid pressure on
to rotatably receive the drive shaft 3! of the mo
opposite sides of the piston, under normal condi
tor. rThe bearing 29 is received in a central re
tions of operation, but when abnormal conditions
cess 32 formed in the port plate 21 and this bear
obtain a differential in pressure on opposite sides
ing is relatively small when compared to the
of the piston will be created which will cause the
bearing 30 in the cover 25. To hold the latter
piston to move and change the angularity of the 50 bearing, the cover 25 is provided with a central
thrust means thereby increasing the torque of the ' boss 33 in which an opening 34 is formed, the
motor.
bearing being inserted in the opening and held
Further objects and advantages of the present
against removal by a snap ring 35. The shaft
invention will be apparent from the following
is prevented from being withdrawn through the
description, reference being had to the accom
bearing 30 through the provision of a shoulder
2,409,185
3
assists in maintaining the relative positions of the
shaft and the bearing. The opening 34 is closed
at the outer end- by a packing gland 39 which is
provided with sealing rings 40 for engagement
4
receive pivot pins 62 which project toward the
36 on the shaft which shoulder engages the inner
race of the bearing 33 at the outer side of the
bearing 30. The shaft 3| is provided with a
groove 31 to receive a second snap ring 38 which
interior of the casing. The pivot pins are pro
vided with tapped holes at their outer ends to
receive screws 62A Which extend into the boss
63 from the outer side of the plates 6| and serve
to retain the pins in‘connection with the plates
‘6| to provide for the pivotal support of a cradle
‘63.
The latter member consists of a ring-like
body provided at opposite sides with apertured
without the escape of ?uid therearound when the’ 10 ears 64 for the reception of the pins 62. When
with the shaft 3| to permit rotation of the shaft
thecradle is disposed in the casing with the pins
52 properly positioned in the openings in the
casing is ?lled with hydraulic ?uid.
The bearing 3|] will be constantly lubricated by
the ?uid in the casing and the bearing 29 at the
inner end of the shaft will be lubricated by the
?ow of ?uid through angularly related passages
4| which extend from the inner face of the port
plate to the inner end of the-recess 32.‘ This
ears 64, the cradle will be free to rock about
axes of the aligned pins. In the present
stance, the casing and the plates 6| with
boss Bil are so formed and positioned that
the
in
the
the
7 axis formed by the pins 62 will extend at right
angles to the shaft 3| and precisely through the
longitudinal axis thereof. The cradle is pro
ment of a cylinder barrel 42 with a circular raised 20 vided with anenlarged ball bearing 65, the outer
race 66 of which is carried directly by the cradle
pad on the inner face of the port plate.
63 and the inner race 61 is supported for rota
The cylinder barrel consists of a cvlindrical
tion' by a. plurality of balls 68, the inner race in
block 43 having a central opening 44 extending
turn supporting the thrust ring 58. Through the
therethroug'h for the reception of a shaft 3|. At
its outer end, the cylinder barrel has a splined 25 provision of the ‘pivoted cradle, the thrust ring
may be adjusted relative to the axis of rotation
connection with the shaft 3| in order that when
of the cylinder barrel from a position substan
the cylinder barrel revolves, similar movement
tially
at right angles thereto, as shown in Fig. 1,
will be imparted to the shaft, the splines serving
to inclined positions, as illustrated in Fig. 2. The
to key these two elements to one another.
‘degree of adjustment of the cradle will depend
Around the central opening 44, barrel 42 is 30 upon the clearance provided between the cradle
provided with a circularly arranged row of cyl
and the adjacent parts of the motor. When the
inders 45 provided for the reception of elongated
cradle is so positioned that the thrust ring is in
pistons 46, the latter being closely ?ttedv to the
clined relative to the cylinder barrel and fluid is
cylinders to reduce the escape of ?uid between
introduced into the cylinders communicating with
35
the walls thereof to a minimum but still permit
the inlet port, the pistons in these cylinders will
sliding movement of the pistons in the cylinders.
be urged toward the thrust ring and due to the
At its rear end, the barrel 43 has arcuate open
inclination thereof, a reaction will be set up which
ings 41 which establish communication between
will cause the cylinder barrel to rotate in a di
the cylinders 45 and inlet and outlet ports 48-and
49,-respectively, formed in the port plate 21. The 40 rection which will permit the pistons to move
outwardly of the cylinders as far as possible.
latter ports are also arcuate in shape and extend
In so moving the cylinders will consequently
slightly less than one-half the distance around
reach the sealing surface 5| which will prevent
the port plate, the ends of the inlet and outlet
communication between the inlet port and the
ports beingr spaced to provide sealing surfaces 50
respective
cylinder, and after each cylinder has
45
and 5|. These sealing surfaces have a plurality _
passed the surface 5|, the cylinder will commu
of shallow recesses 51A formed therein to entrap
nicate with the outlet port 49 whereby the ?uid
foreign material contained in the hydraulic ?uid
will be permitted to escape and relieve the pres
and prevent the same from injuring the sealing
sure in the cylinder. As one cylinder moves be
surfaces or other parts of the motor due to abrad
yond the end of the inlet port 48, another cyl
method of providing for lubrication of the hear
ing 29 is essential because of the sealing engage
ing action.
The inlet and outlet ports 48 and 419 are con
nected at their inner ends with chambers 52 and
53 formed in the port plate 2'! with which con
50
inder will be moved into communication there
with and the cycle of operation will be repeated.
During the time the cylinders are in communica
tion with the port 49 while the cylinder barrel
duits 54 and 55 communicate. These conduits
is revolving, the ?uid previously introduced to
55
are threaded into a connector plate 56 which is
the cylinders will be expelled because the pistons
attached to the outer end of the port plate and
are moved inwardly of the cylinders by the thrust
sealing rings 51 are disposed around the cham
ring. When the piston in any particular cylin
bers 52 and 53 at the points where the openings
der has been forced into the cylinder as far as
in the connector plate meet the chambers. These
possible by the thrust ring, the respective cyl
sealing rings prevent the escape of ?uid at the 60
inderwill have reached the sealing surface 50
joint between the connector and port‘ plates.
whichyseparates the rear end of the outlet port
When ?uid under pressure from any suitable
from the forward end of the inlet port and ?uid
source is introduced into the chamber 52 through
flow from the cylinder will be discontinued.
the pipe 54, the ?uid will ?ow through the inlet
the surface 50 is passed ?uid under pres
port 48 and into the particular cylinders 45 which 65 After
sure will again ?ow into the cylinder as before
are connected to the inlet port by the openings
described. Continued rotation of the cylinder
41. This ?uid will force the pistons 46 outwardly
barrel causes repeated operations of the pistons
of the cylinders causing the outer ends of the
and the cylinder barrel will be caused to rotate
pistons to exert pressure on a thrust ring 58
as long as ?uid under pressure is supplied to the
70
which is supported around the shaft 3| at the
inlet port and the thrust ring is maintained in an
outer end of the cylinder barrel.
inclined position.
To support the ring 58, the casing 2| is pro
' t is proposed to utilize this motor for effect
vided at its sides with registering openings 59
ing
the operation of any suitable machine such
for the reception of bosses 60 provided on plates
6|. These bosses are formed with openings to 75 as‘ a lathe, and in some instances, loads applied
5
2,409,186
to the machine will increase the resistance to
turning movement of the motor shaft. When
these conditions obtain, it has been found de
sirable to increase the inclination of the thrust
6
piston 13, tothe opposite end of the chamber 12.
This end of the chamber is connected by a series
of passages 95, 96 and 9‘! with the interior of the
casing 2|. Under normal conditions, ?uid ?ow
through this series of passages is precluded by a
or if the load on the motor is decreased, the
relief valve 98 disposed in a chamber 99 formed
torque should be correspondingly decreased.
in the body ‘I0 between the passages 95 and 96.
The thrust ring has been supported within the
Since ?uid is contained by the chamber ‘I2 on
casing in the manner previously described to
both sides of the piston 73 and the valve 98_ is
permit these adjustments. To effect them auto 10 closed, pressure on opposite sides of the piston
matically, however, additional mechanism has
will be equalized and piston 13 will remain sta
been provided as indicated generally at 69 in
tionary. The valve 98 includes a seat I00 and a
Figs. 1 and 2. This mechanism includes a body
conical valve I 0|, the latter being carried by a
‘I0 which is secured to an inclined pad ‘(I on the
head I02 disposed for sliding movement in the
rear wall of the casing 2|. The body is provided 15 chamber 99. Valve seat I00 is arranged in the
with an internal chamber 12 for the slidable
chamber 99 between the points where passages
reception of a piston ‘I3. This piston has a stem
95 and 96 communicate therewith and the valve
i4 projecting therefrom through an opening in
IOI is held in engagement with the seat I00 to
the body into the interior of the casing 2I. At
normally prevent communication between the
its inner end, this stem engages a roller ‘I5 car 20 passages 95 and 96, by a coil spring I03 which
ring and thereby increase the torque of the motor
ried between bifurcated ears 15 on the cradle 63,
the roller ‘I5 being rotatably mounted on a pin
'I'I supported by the ears ‘I6, to eliminate friction
between the stem ‘M and the cradle during rela
tive movement of these elements. The ears ‘I6 25
are disposed on the cradle at approximately 90°
from the axis formed by the pins 62 and a sec
engages the head I02 at one end and an adapter
I04 at the other end. The degree of force ex:
erted by the spring on the head and valve may
be varied through the adjustment of screw I05
carried by a plug I09 which closes the outer end
of the chamber 99. The inner end of the screw
I05 has a conical point for engagement in a sim
ilarly shaped recess in the adapter. When the
screw I95 is adjusted inwardly, the force exerted
ond set of ears ‘I8 are arranged on the cradle di
ametrically opposite the ears ‘I5. Ears 79 are
spaced to receive a second roller ‘I9 which is en 30 by the spring on the valve will be increased and,
gaged by the inner end of a plunger 80 disposed
for sliding movement in an opening formed in
a body 8|. This body is secured to the upper
conversely, if the screw is adjusted outwardly,
the spring will exert less force on the valve. The
screw is maintained in its positions of adjust—
portion of the rear wall of the casing 2I and is
ment by a jam nut I01. To prevent the escape
provided with a chamber 82 in open communi 35 of ?uid around the screw, a ?exible seal ‘I08 is
cation with the opening in which the plunger
positioned between the inner end of the plug I06
80 slides. The outer end of the chamber 82
and the movable head I02. When the pressure
is closed by a plug 93 which also serves as an
on the ?uid in the chamber 12 increases suffi
abutment for one end of spring 84, the opposite
ciently to overcome the force exerted by the
end of this member engaging the outer end of 40 spring I03, the ?uid will ?ow past the valve HH
the plunger 89. Due to the resiliency of the
and through ports 99 and 91 to the interior of
spring 84, the plunger 80 will be urged into
the casing 2|. This ?ow will permit ?uid to
yieldable engagement with the roller ‘I9 and will
escape from the inner end of the chamber ‘I2 and
tend to maintain the cradle 93 in a position at
if the rate of flow is greater than the rate at
right angles to the axis of rotation of the shaft 45 which ?uid can ?ow through the ori?ce 94 the
3 I. To assist the spring 94 in moving the plunger
piston will be moved inwardly or toward the cas
89 and the cradle 93, the body BI is provided with
ing by the ?uid pressure on the outer side of the
an opening 85 through which ?uid under pres
piston. This movement will be transmitted to
sure is supplied to the chamber 82. This ?uid
the cradle by the stem ‘I4 and the cradle will be
enters the chamber through an elbow 86 threaded 50 rocked about the pins 62 to an inclined position.
into the opening 85 and connected to one end
as shown in Fig. 2, and the torque of the motor
of a tube M which receives hydraulic ?uid under
will be increased. The movement of the cradle
pressure from the inlet of the motor.
will be discontinued when the piston 13 reaches
To move the cradle against the force of the
the limit of its travel or the ?uid pressures on
spring 84 and the ?uid supplied to the chamber 55 opposite sides of the piston became balanced due
82, means are provided to supply ?uid under
to the restriction of fluid flow through the pas
pressure to one end of the chamber ‘I2. This
sages 95, 9E and 91 by the valve IOI. When the
means comprises an elbow 89 which is threaded
latter condition occurs, the force exerted by
into the body ‘It and communicates with a drilled
spring 34 and the ?uid in chamber 82 will tend
opening 89 extending from the opening for the
to move the cradle towards its inactive position,
elbow to the outer end of the chamber ‘I2. A
shown in Fig. 1, and this movement will cause
section of tubing 99 is connected at one end to
the piston ‘I3 to move toward the outer end of
the elbow 88 and at the other end to a ?tting 9I
chamber 12. The rate of movement of the pis
threaded into the port plate as at 92. A short
ton in this direction will be controlled by the
passage 93 leads from the inner end of the ?tting 65 speed at which ?uid can flow through the ori?ce
9! to the chamber 52 which is connected with
94.
.‘
the inlet port 48 and the source of ?uid under
In some instances, it may be desirable to limit
pressure. Thus, when ?uid is initially supplied
the degree of movement, of the cradle toward
to the pump, some thereof will ?ow through the
the position wherein the thrust ring will, be at
passage 93 and tubing 99 to the elbow 88 and 70 right angles to the axis of the shaft 3|. To
through the opening 99 to the chamber ‘I2. This
accomplish this object, a stem I99 is provided
?uid will exert pressure on the outer side of the
on the outer side of the piston 2'3. This stem
piston 13 and tend to move the same toward the
extends into an opening formed in the cap II 0
motor casing. Some of the ?uid will ?ow
for the body ‘It and engages the inner end of a
through a restricted ori?ce 94 provided in the
threaded stop screw I I I, the head of which is also
8
disposed in theopening. The longitudinal posi
tion of the stop screw in the opening may be
changed by adjusting a hand wheel H2 which is
rotatably supported at the outer end of the body
10. This hand wheel is keyed at H3 to a‘ sleeve
H4 which is interiorly threaded for the recep
tion‘of stop screw IH. One end of the sleeve is
the ?uid supplied to chamber_8_2_ will moveinthve
plunger 80 into the casing’ and transmit force
to the cradle causing it to move in the opposite
direction. This movement will be transmitted to
the stem Y14 and piston 13. whereby the latter
will move toward the outer end of the chamber
72. As the thrust ring approaches a position at
right angles to the shaft 31, the resistance to
provided with a ?ange H5 to form a shoulder
the flow of ‘fluid through the motor will again
H6 with which a complemental-shoulder pro
vided in a retaining nut H1 is engaged.‘ The 10 increase ‘and the cycle of operation will be re
peated. The apparatus will ?nally reach a bal
nut H1 is interiorly threaded so that it may
anced condition wherein the thrust ring is main
be applied to the threaded reduced outer end
tained at the properly inclined position to cause
of the cap Hi]. When the nut H1 is so posi
the motor to develop the required power‘ but
tioned, the end of the sleeve H4 will be held in
abutting relation with the end of the cap through 15 in the event an undue load is placed 'on the
motor, the pressure of the incoming ?uid will
the engagement of the shoulders on the sleeve
and in the nut. As illustrated in Figs. 1 and 2,
the opening for the stem I09 has a keyway for
the reception of a key H8 carried by the head
of the screw H i. This key prevents the screw 20
from rotating and when the hand wheel H2 is
revolved, the reaction between the threads in
the sleeve H4 and on the screw III will cause
the latter to move into or out of the opening
of the cap H0. The degree of movement may be
determined by comparing the relative position of
the annular marks on the outer end of the screw
with the outer end of the sleeve. When it is
again be increased-causing the automatic con
trol mechanism to operate to again increase the
angularity of the thrust ring. Thus the torque
of'the motor will be increased as occasion de
mands. When the relief valve 98 operates to
permit ?uid to flow from the passage 95 to pas:
sage 96,’this ?uid will ?ow through passage 91
into the motor casing. It will escape from this
casing through a conduit I20 at the top of the
motor to the outlet chamber 53 with which the
conduit I 20 is connected.
While the form of embodiment of the present
desired to make this adjustment, the nut H1 is
invention as herein disclosed constitutes a pre
turned suf?ciently to free the ?ange I I5 and per
mit the hand wheel and sleeve to rotate. After
the screw has been placed in the desired posi
tion, the nut H‘! is tightened to clamp the ?ange
H5 and maintain the adjustment. Packing H9
scope of the claims which follow.
is provided around the stem I09 to prevent the
escape of ?uidfrom the chamber 12.
, The operation of the device is as follows: As
suming that the system in which the motor is
connected is charged with hydraulic ?uid; upon
ferred form, it is to be understood that other
forms might be adopted, all coming within the
I claim:
_
_
'
1. A ?uid motor actuated by ?uid pressure
comprising a casing having inlet and outlet ports:
shaft means journalled‘ in said casing; a barrel
having a plurality of cylinders for imparting ro
tation to said shaft means, said cylinders com
municating alternately with said inlet and outlet
the introduction of ?uid under pressure to the 4:0 ports upon rotation of said cylinder barrel; piston
means disposed for movement in said cylinders;
motor through the line 54, the ?uid will flow
thrust means mounted in said casing in engage
through the inlet port 48 into the cylinders com
ment'with said pistonmean's, said thrust means
municating therewith. The pressure of the ?uid
being
disposed at an anglewith respect to axis
on the pistons will force the same outwardly
of said shaft; and means. for varying the angle
against the thrust ring. If the thrust ring is
of said, thrust means including a body having a
at right angles to the axis of the shaft iii,v the
chamber,
a piston disposed for movement in said
cylinder barrel will not revolve and the motor
chamber, means for transmitting movement from
shaft will stand idle. The pressure will there
said piston to said thrust means, ?uid conduct
fore increase in the line 54 and chamber 52 as
well as in tubing 90 and the outer end of chamber 59 ing means establishing communication between
said inlet port and one end of said chamber and
'12. The pressure on the ?uid will also be exerted
the opposite end of the chamber and said outlet
by'the piston 13 on the fluid in the inner end of
port, said piston having a restricted ori?ce estab
chamber v‘i2, and will be transmitted through the
lishing communication between opposite ends of
passage 95 to the inlet side of relief valve 98'.
When this pressure is of sufficient intensity to 55 said chamber, and a pressure operated valve lo__
cated between said chamber and said outlet port,
overcome the force of spring I03, the valve will
said. valve being operative under predetermined
open to permit ?uid to escape from the inner
?uid pressure to establish ?uid ?ow from said
end of the chamber and a differential in pres
chamber.
sure will exist on opposite sides of piston 13,
2. A ?uid motor actuated by ?uid pressure
the higher pressure being on the outer side there 60
comprising a casing having inlet and outlet ports;
of. Due to this difference in pressure, the piston
shaft means journalled in said casing; a barrel
will move toward the motor casing 2| causing
having a plurality of cylinders for imparting ro
the stem 14 to impart movement to the cradle
tation to said shaft means; said cylinders com
and the thrust ring will then be inclined with
respect to the cylinder barrel] When this con 65 municating alternately with said inlet and out
let ports upon rotation of said cylinder barrel;
dition obtains the force of the pistons against
piston means disposed for movement in said cyl
the thrust ring reacts to cause the cylinder barrel
inders, a cradle mounted in said casing for piv
to revolve. After the cylinder barrel gains some
otal movement about an axis extending‘ at right
momentum and the resistance to rotation has
decreased, the pressure on the ?uid in the cham 70 angles to and through the axis of rotation of said
shaft means, thrust means carried by said cradle
ber 72 will be relieved and valve 98 will close
in engagement with said pistons’; and means for
to. such an extent that the ?ow of ?uid through
moving said cradle about .the axis therefor, said
the restricted ori?ce 94 will be sufficient to bal
cradle moving means having a body with a cham
ance the pressure on opposite sides of the piston
‘13. At this time, the force of the spring 84 and 75 berra piston mounted for movement in said
2,409,185
"9
chamber, means for transmitting movement from
said piston to said cradle, ?uid conducting means
establishing communication between the inlet to
10
means in said casing’ supporting said thrust
means for movement to vary the angular rela
tion thereof to said pistons, and means for auto
matically controlling the angularity of said thrust
said casing and one end of the chamber in said
body, means for conducting ?uid from the op
posite end of the chamber, said piston having an
ori?ce to establish restricted communication be—
means in response to pressure variations in said
whereby pressure differentials will exist on op~
posite sides of said piston and the latter will move
in response to the higher pressure.
3. A motor actuated by ?uid pressure co'm
?ow from the other of said chambers whereby
inlet port, said control means having a body with
a cylinder therein; control piston means dividing
tween opposite ends of the chamber in said body
said cylinder into a pair of chambers, said con
and a spring-pressed valve in said latter ?uid
trol piston being provided with a reduced ori?ce
conducting means, said spring pressed valve be 10 to establish limited communication between said
ing responsive to pressures in the chamber in said
chambers; means for supplying fluid at the pres
body to provide for fluid ?ow from said chamber
sure in said inlet port to one of said chambers;
prising a casing having inlet and outlet ports;
a cylinder barrel supported for rotation in said
casing with the cylinders thereof alternately com
and pressure responsive means to control ?uid
pressure differentials will occur on opposite sides
of said control piston to cause movement thereof.
6. A motor actuated by fluid pressure compris~
ing a casing having inlet and outlet ports; a
cylinder barrel supported ‘for rotation in said
municating with said inlet and outlet ports; pis
20 casing with the cylinders thereof alternately com
ton means disposed for movement in said cylin
municating with said inlet and outlet ports, piston
ders; thrust means engaging said pistons; means
means disposed for movement in said cylinders;
in said casing supporting said thrust means for
thrust means engaging said pistons; means in
movement to vary the angular relation thereof
said casing supporting said thrust means for
to said pistons; and means for automatically con 25 movement to vary the angular relation thereof
trolling the angularity of said thrust means in
to said pistons, and means for automatically con
response to pressure variations in said inlet port,
trolling the angularity of said thrust means in
said control means having a body with a cylinder
response to pressure variations in said inlet port,
therein; control piston means dividing said cyl
said control means having a body with a cylinder
inder into a pair of chambers having limited com~ 30 therein; control piston means dividing said
munication with one another; means transmit
cylinder into a pair of chambers, said control
ting movement from said piston means to said
piston being provided with a reduced ori?ce to
thrust means; means connecting one of said
establish limited communication between said
chambers with the port having the variable pres
chambers; means for supplying ?uid at the pres
sures; passage means connecting the other cham
sure in said inlet port to one of said chambers;
ber with a low pressure line; and means re
pressure responsive means to control ?uid ?ow
sponsive to the pressures in said inlet port to
from the other of said chambers whereby pres
control ?uid ?ow through said last mentioned
sure differentials will occur on opposite sides of
passage means.
said control piston to cause movement thereof;
4. A motor actuated by ?uid pressure com 40 and means for varying the sensitivity of said pres
sure responsive means.
prising a casing having inlet and outlet ports;
a cylinder barrel supported for rotation in said
7. A motor actuated by ?uid pressure com
casing with the cylinders thereof alternately
prising a casing having inlet and outlet ports; a
communicating with said inlet and outlet ports,
cylinder barrel supported for rotation in said
piston means disposed for movement in said cyl 45 casing with the cylinders thereof alternately com
inders; thrust means engaging said pistons;
municating with said inlet and outlet ports, pis
means in said casing supporting said thrust
ton means disposed for movement in said cylin
means for movement to vary the angular rela
ders; thrust means engaging said pistons; means
tion thereof to said pistons, and means for auto»
in said casing supporting said thrust means for
matically controlling the angularity of said thrust
movement to vary the angular relation thereof to
means in response to pressure variations in said
said pistons, and means for ‘automatically con
inlet port, said control means having a body with
trolling the angularity of said thrust means in
a cylinder therein; control piston means dividing
response to pressure variations in said inlet port,
said cylinder into a pair of chambers having
said control means having a body with a cylinder
limited communication with one another; means 55 therein; control piston means dividing said cyl
transmitting movement from said piston means
inder into a pair of chambers, said control piston
to said thrust means; a ?uid passage connecting
being provided with a reduced ori?ce to establish
one of said chambers with the port having the
limited communication between said chambers;
variable pressures whereby increasing pressure
means for supplying ?uid at the pressure in said
will cause said piston to move said thrust means 60 inlet port to one of said chambers; pressure
to vary the angularity thereof relative to the
responsive means to control ?uid flow from the
pistons in said cylinder barrel; a second ?uid
other of said chambers whereby pressure differ
passage connecting the other of said chambers
entials will occur on opposite sides of said con
with a low pressure line; and valve means for
trol piston to cause movement thereof; and means
controlling ?uid flow through the second ?uid 65 for limiting the range of operation of said con
trol piston.
passage, said valve being responsive to variations
in pressure in the chamber connected with said
8. A motor actuated by ?uid pressure compris
passage.
ing a casing having inlet and outlet ports; a
5. A motor actuated by ?uid pressure com
cylinder barrel supported for rotation in said
prising a casing having inlet and outlet ports; 70 casing with the cylinders thereof alternately
communicating with said inlet and outlet ports,
casing with the cylinders thereof alternately
piston means disposed for movement in said
communicating with said inlet and outlet ports,
cylinders; thrust means engaging said pistons;
piston means disposed for movement in said cyl
means in said casing supporting said thrust means
inders; thrust means engaging said pistons; 75 for movement to vary the angular relation thereof
a cylinder barrel supported for rotation in said
£405,185
11
v
to said pistons, and means for automatically con
trolling the angularity of said thrust means in
12
to said pistons; and means for automatically cone
trolling the angularity of said thrust means in
response to pressure variations in said inlet port,
response to pressure variations in said inlet port,
said control means having a passage extending
said control means having a body with a cylinder
from the inlet port to an outlet; a cylinder in
therein; control piston means dividing said cyl
said
passage; control piston means dividing said
inder into a pair of chambers, said control pis
cylinder into chambers, a passage of predeter
ton being provided with a reduced ori?ce to estab
mined size establishing limited communication
lish limited communication between said cham
between said chambers; said control piston being
bers; means for supplying fluid at the pressure
movable
in response to pressure differentials in
in said inlet port to one of said chambers; pres
said chambers; means for transmitting movement
sure responsive means to control ?uid ?ow from
of said piston to said thrust means; valve means
the other of said chambers whereby pressure
in
said passage between said cylinder and said
differentials will occur on opposite sides of said
outlet, said valve being responsive to pressures
control piston to cause movement thereof; and
means for varying the minimum torque developed 15 above apredetermined degree to increase ?uid
flow from said cylinder; and means for varying
by said motor at a particular ?uid pressure.
the degree of pressure at which said valve becomes
9. A motor actuated by ?uid pressure com
operative.
-_
prising a casing having inlet and outlet ports;
11. A motor actuated by ?uid pressure com
a cylinder barrel supported for rotation in said
casing with the cylinders thereof alternately com 20 prising a casing having inlet and outlet ports; a
cylinder barrel supported for rotation in said
municating with said inlet and outlet ports, pis
casing with the cylinders thereof alternately com
ton means disposed for movement in said cyl
municating with said inlet and outlet ports, pis~
inders; thrust means engaging said pistons;
ton means disposed for movement in said cylin
means in said casing supporting said thrust means
ders; thrust means engaging said pistons; means
for movement to vary the angular relation there
in
said casing supporting said thrust means for
of to said pistons; and means for automatically
movement to vary the angular relation thereof
controlling the angularity of said thrust means
to said pistons; resilient means tending to urge
in response to pressure variations in said inlet
said thrust means toward an inactive position;
port, said control means having a passage ex
tending from said inlet port to an outlet; 9. cyl 30 means for urging said thrust means toward active
position in opposition to said resilient means,
inder in said passage; control piston means divid
said second urging means having a cylinder; a
ing said cylinder into chambers, a passage estab
piston
disposed for movement in said cylinder
lishing limited communication between said
chambers; said control piston being ‘movable in
response to pressure di?erentials in said cham
bers; means for transmitting movement of said
piston to said thrust means; and pressure respon
sive means in said passage between said cylinder
and said outlet to control ?uid flow from said
cylinder, an increase in pressure in said cylinder
in response to pressure differentials obtaining in
opposite ends of said cylinder, said piston being
returned to normal position by said resilient
means when pressures are equalized in opposite
ends of said cylinder; means for transmitting
motion from said piston to said thrust means;
and means for creating pressure differentials in
opposite ends of said cylinder having a ?uid pas
sage connecting one end of said cylinder and the
inlet port of said motor; a second ?uid passage
extending from the opposite end of said cylinder
10. A motor actuated by fluid pressure com- _
to the outlet port, the ends of said cylinder being
prising a casing having inlet and outlet ports; a
in limited communication; and pressure respon
cylinder barrel supported for rotation in said
sive valve means in said second ?uid passage, said
casing with the cylinders thereof alternately com
valve means regulating ?uid?ow through said
municating with said inlet and outlet ports,
second passage in proportion to the pressures
piston means disposed for movement in said cyl
inders; thrust means engaging said pistons; 50 existing in the end of said cylinder connected
with said second passage,
means in said casing supporting said thrust means
VICTOR V. BLASUTTA.
for movement to vary the angular relation thereof
beyond a predetermined degree serving to in
crease the ?ow of ?uid from said cylinder to
create a differential in pressure in said chambers.
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