US2586623A - Hydraulic control system - Google Patents

Hydraulic control system Download PDF

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Publication number
US2586623A
US2586623A US625599A US62559945A US2586623A US 2586623 A US2586623 A US 2586623A US 625599 A US625599 A US 625599A US 62559945 A US62559945 A US 62559945A US 2586623 A US2586623 A US 2586623A
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Prior art keywords
piston
conduit
releaser
stroke
movement
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US625599A
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English (en)
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Detrez Rene
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Individual
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Individual
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/20—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members
    • F15B11/205—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members the position of the actuator controlling the fluid flow to the subsequent actuator

Definitions

  • this invention relates to an improvement in the system disclosed in my earlier filed co-pending application Serial No. 613,664, filed August 30, 1945, now abandoned.
  • the principle advanced by said co-pending application embodied controlling of the movement of parts of certain machines by hydraulic pistons actuatingr and locking one another and so arranged that the initiation of movement of the several pistons is possible only when the controlling piston has moved a distance corresponding to the work that it must perform.
  • This mutual controlling and locking of the pistons was effected by rst utilizing the translatory movement of each piston and by providing one or more passages in the piston rods which at the proper moment provided communication with other passages provided in the cylinders to transmit fluid under pressure to distributing valves controlling the pistons to be moved.
  • the passages provided in the piston rods permitted liquid to be driven out of the cylinders. long working stroke of a piston is involved, the length of stroke would require an elongated passage the length of which contributed to the escape of fluid under pressure from the cylinder.
  • the present invention therefore. has for ,an object to provide a hydraulic control system vof the type disclosed in said co-pending application but structurally organized so as to eliminate the aforementioned deficiencies attendant with providing passages in the piston rods.
  • control system comprises a number of similar units each embodying a hydraulic motor, the piston of which has at least one cam member fast to the piston rod orto another member .fixed to ⁇ the piston rod. at least one releaser actuated by the cam and a distributor controlling .the hydraulic motor, the said distributor being .controlled in turn by a releaser associated with any one of the units.
  • a given sequence of motion may be .automatically repeated.
  • the speed of movement of all of the pistons can be regulated by means of a .single control valve.
  • Each piston can initiate the movement .of several other pistons simultaneously and by utilizing yieldable cam members controlling at least one releaser can initiate vthe movement of several -other pistons successively.
  • the control system includes three hydraulic motors reach including driving or working pistonsand .their associated rods a1, b1 .and c1 .reciprocable respectively in cylinders a2, b2 ⁇ and e2.
  • Each piston rod has mounted fast thereon the support members am, 1219 and c19 Whichreciprocate with the pistons.
  • 'Ihe ow of .pressure fluid .to the respective .cylinders is controlled by ⁇ distributors associated therewith and -including the distributor valves a3, b3, and c3 havingpistons at the opposite ends thereof recip- AIocablein the cylinders a4, b4 .and c4 respectively.
  • each of the releasers embodies a movable member adapted to be actuated in response to the stroke of the working pistons, as will be set forth in detail hereinafter.
  • cam members c2", ya21 and n.22 so arranged as to engage and depress at the proper time plungers i123, c and a27 respectively embodied with releasers n.24, a26 and a2, the depressing of these plungers permitting iiuid to flow through the particular releaser to the distributors in communication with that releaser.
  • Additional cams are provided on the support members b1g and C19.
  • the cam b2 at the lower edge of support 2219 cooperates with and depresses plunger b23 of the releaser Z224 while support C19 has lower and upper cams c2 and C21 cooperating respectively with the plungers o23 and C21 of the releasers c24 and c28-
  • solid lines denote pressure lines having their origin at a source of pressure constituted by a motor driven pump p drawing working fluid from a tank r which is in communication with the atmosphere and delivers fluid under the control of a shut-oir gate valve l1.
  • the pressure lines P on the delivery side of valve il lead to the releasers and to the distributors.
  • the thick, broken lines denote conduits providing communication between the releasers and the distributors and the line A denotes a return pipe to the reservoir which is at atmospheric pressure.
  • Conduits a6 and a1 provide communication between the distributor cylinder a4 and the opposite ends of the working cylinder a2 and similar arrangements embodying conduits b, b1 and c?, c1 provide communication between the distributors b1, c4 and working cylinders b2, c2. respectively.
  • the fine, solid lines a9, b9 and o9 denote conduits connecting the distributors ayi and c1 with the return pipe A for evacuating liquid discharged through the distributors by the working pistons.
  • the ne broken lines am, bu", i115", 1215, C12 and c15 denote conduits through Wwhich liquid travels from the releasers to the return pipe. ⁇
  • the liquid discharged by the upper end of distributing slide valve c3 ows through conduit am", thence through releaser e121 and conduit am".
  • the liquid discharged from the lower end of slide valve b3 ows through conduit Z112', releaser :L26 and conduit 1112.
  • the discharge from the upper end of distributor valve a3 flows through conduit 1315', distributor Z224 and conduit b15".
  • the circuit of the pump p also includes a disder b2 through piping b6 to raise piston b1.
  • the piston 0.1 is at the lower point of its stroke.
  • the slide valve a1 of the distributor a4 has just reached the upper point of its stroke so that the circular groove a5 on the slide valve a3 is in communication with the pressure line P extending parallel with conduit b15".
  • the fluid in cylinder a2 can escape therefrom through conduit a7, chamber as in the slide valve and return to the tank 1* through conduit a9 and return pipe A.
  • cam b2 will engage and depress plunger Z323 of releaser i324 so that fluid under pressure will flow through this releaser, thence through conduit Z215' to the upper end of distributor a;4 for actuating the same downwardly.
  • the piston c1 is also at the upper end of its stroke in cylinder c2.
  • the slide valve c3 is at the top of its stroke in distributor c1 so that the pressure uid has passed through the distributor, the groove c5 and the piping c6 to the under side of piston c1.
  • the downward stroke of the piston a1 has actuated releaser a21 so that iiuid will now flow into distributor c4 at the top, and in the drawing the slide valve c3 is about to be moved downwardly so that the circular groove o16 will serve for the passage of pressure fluid from the source into piping c'I to the upper side of piston c1 to lower the same.
  • cam a22 When the piston u1 reaches its upper position cam a22 will displace plunger L27 permitting fluid under pressure to ow through releaser a22 and conduit a15 into the upper end of distributor b4 to displace distributor valve b5 downwardly to place groove b1s in registry with conduit b7 4to permit the lowering of piston b1 which, upon reaching its lower position through the cooperation of cam Z120 with plunger Z123 will permit fluid under pressure to flow through releaser b24 and conduit Z915' to the upper end of distributor a4 so that the resulting displacement of slide Vvalve a3 will permit pressure fluid to move piston a1 downwardly.
  • piston a1 controls slide valves b3 and c3 successively, the first shortly before the end of the downward stroke and the second at the end of the downward stroke.
  • the cam (121 engages and depresses plunger a25 of releaser 126.
  • this releaser is displaced laterally out of alignment with the other two releasers associated with cylinder a2 and the cam a21 which is pivoted to the cylinder projects outwardly of support L19 a distance greater than the extent of projection of cams a and a22 respectively.
  • Cam 0,21 is provided with a tongue on its rear side which limits the pivoting movement thereof so that it cannot pivot upwardly beyond the position shown in the drawing and a spring urges the same to the position illustrated.
  • cam a21 actuates the plunger c25, thus permitting pressure uid to flow through releaser a26 into conduit 1112 to the under side of distributing slide valve b3 for raising distributing valve b3 to permit fluid under pressure to enter cylinder b2 to raise piston b1.
  • the continued downward movement of piston a1 effects the cooperation between cam w20 and plunger 0,23 to permit the pressure fluid to now into the upper end of distributor c4 displacing the valve c3 permitting pressure fluid to lower piston c1.
  • piston c1 on arriving at its lower position actuates plunger C22 to eiect the raising of slide valve c3 and thus the return or upward stroke of the piston c1.
  • piston c3 When piston c3 reaches its upper position it again actuates the plunger C22 to permit fluid to again ilow through conduit 015 to the lower side of distributor a4 for further actuation of the slide valve a3 and resulting in upward displacement of the piston a1.
  • the yieldable cam a21 is employed to effect the upward actuation of distributor valve b2 before the downward movement of distributor valve c3.
  • This stop must be yieldable in one direction of movement of the pitston a1 since otherwise the passage of liquid under pressure would occur twice, once when the piston a1 comes down and again when it rises when the order of the actuation of the distributing slide valves would be disrupted.
  • the velocity at which the strokes of all driving pistons are performed can be controlled by throttling the now of the fluid under pressure by means ⁇ of the valve l1.
  • a source of uid under pressure having a delivery conduit, controlling means in the delivery conduit of said source, an exhaust conduit, a plurality of hydraulic motors each comprising a working cylinder having ports at its ends, a driving piston reciprocable in each of said working cylinders, a piston rod fast to each of said pistons and to lthe movable part to 'be controlled; a plurality of releasers each including an inlet bore connected with said delivery conduit, an exhaust bore connected with said exhaust conduit, a control bore, movable means for connecting said control bore respectively with said inlet bore and said exhaust bore, and resilient means urging said movable means towards the position 'connecting said control bore with said exhaust bore; cam members fast to said piston rods and adapted to act upontheir associated movable means at a given point of the stroke of said driving pistons; a plurality of slide valves each adapted to connect the ports of its associated cylinder respectively ivith said delivery conduit and
  • a source of duid under pressure having a delivery conduit, controlling means in the delivery conduit of said source, an exhaust conduit, a plurality of hydraulic motors each comprising a Working cylinder having ports at its ends, a driving piston reciprocable in each of said working cylinders, a piston rod fast to each of said pistons and to the movable part to be controlled; a plurality of releasers each including an inlet bore connected with said delivery conduit, an exhaust bore connected with said exhaust conduit, a control bore, movable means for connecting said control bore respectively with said inlet bore and said exhaust bore, and resilient means urging said movable means towards the position connecting said control bore with said exhaust bore; cam members fast to said piston rods and adapted to act upon their associated movable means at a given point of the stroke of said driving pistons; at least one cam member adapted to act upon at least one of the movable means in one direction of the movement of the corresponding driving piston.
  • each slide valve having an actuating cylinder disposed on opposite sides thereof, each actuating cylinder having an orilice in the bottom thereof, and transmitting conduits interconnecting said control ocres to said orifices in a given order following the sequence of operations to be performed.
  • a hydraulic control system as claimed in claim'l in which the Working cylinders are arranged in series and include a first and a last cylinder' and the control bore of one releaser of the last Working cylinder is connected to the orifice of an actuating cylinder of the slide valve belonging to the first Working cylinder so that the sequence of motions is automatically repeated.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Fluid-Pressure Circuits (AREA)
US625599A 1944-11-03 1945-10-30 Hydraulic control system Expired - Lifetime US2586623A (en)

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FR55824T 1944-11-03

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2733869A (en) * 1956-02-07 Apparatus for coiling
US2777102A (en) * 1950-12-18 1957-01-08 Joy Mfg Co Mining machine and automatic cycling control mechanism therefor
US2781056A (en) * 1953-02-12 1957-02-12 Continental Motors Corp Hydraulic valve control for reversing transmission
US2979215A (en) * 1957-12-19 1961-04-11 Lodal Inc Loader bucket and grapple apparatus
US3565114A (en) * 1968-02-16 1971-02-23 Philips Corp Fluidic program device for automatic sequential control

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1179195A (en) * 1910-04-30 1916-04-11 William G Freer Bottle-washing apparatus.
US1870503A (en) * 1931-01-23 1932-08-09 Liquid Carbonic Corp Bottle cleaning apparatus
US1905065A (en) * 1929-12-16 1933-04-25 Zimmermann & Jansen Gmbh Valve actuating means for air heaters
US1994974A (en) * 1930-06-21 1935-03-19 Oilgear Co Differential resistance valve
US2054296A (en) * 1935-02-08 1936-09-15 Oilgear Co Duplex broaching machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1179195A (en) * 1910-04-30 1916-04-11 William G Freer Bottle-washing apparatus.
US1905065A (en) * 1929-12-16 1933-04-25 Zimmermann & Jansen Gmbh Valve actuating means for air heaters
US1994974A (en) * 1930-06-21 1935-03-19 Oilgear Co Differential resistance valve
US1870503A (en) * 1931-01-23 1932-08-09 Liquid Carbonic Corp Bottle cleaning apparatus
US2054296A (en) * 1935-02-08 1936-09-15 Oilgear Co Duplex broaching machine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2733869A (en) * 1956-02-07 Apparatus for coiling
US2777102A (en) * 1950-12-18 1957-01-08 Joy Mfg Co Mining machine and automatic cycling control mechanism therefor
US2781056A (en) * 1953-02-12 1957-02-12 Continental Motors Corp Hydraulic valve control for reversing transmission
US2979215A (en) * 1957-12-19 1961-04-11 Lodal Inc Loader bucket and grapple apparatus
US3565114A (en) * 1968-02-16 1971-02-23 Philips Corp Fluidic program device for automatic sequential control

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Publication number Publication date
GB631308A (en) 1949-11-01
FR55824E (fr) 1952-09-08
BE460580A (en))

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