US3686856A - Hydraulic servomotor with air motor - Google Patents

Hydraulic servomotor with air motor Download PDF

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Publication number
US3686856A
US3686856A US90341A US3686856DA US3686856A US 3686856 A US3686856 A US 3686856A US 90341 A US90341 A US 90341A US 3686856D A US3686856D A US 3686856DA US 3686856 A US3686856 A US 3686856A
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US
United States
Prior art keywords
servomotor
space
plunger
hollow
conduit means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US90341A
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English (en)
Inventor
Witold Rozwadowski
Aleksander Szymanski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GLOWNE B ST P ZEPLECZA TECHNIC
GLOWNE BIURO STUDIOWI PROJEKTOW ZEPLECZA TECHNICZNEGO WARSZAWA
Original Assignee
GLOWNE B ST P ZEPLECZA TECHNIC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GLOWNE B ST P ZEPLECZA TECHNIC filed Critical GLOWNE B ST P ZEPLECZA TECHNIC
Application granted granted Critical
Publication of US3686856A publication Critical patent/US3686856A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • F15B11/032—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters
    • F15B11/0325—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters the fluid-pressure converter increasing the working force after an approach stroke
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/216—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being pneumatic-to-hydraulic converters
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/775—Combined control, e.g. control of speed and force for providing a high speed approach stroke with low force followed by a low speed working stroke with high force, e.g. for a hydraulic press

Definitions

  • the servomotor is constructed as an integral unit and consists of the piston air motor of one-sided action and of relatively high frequency running, hydraulic storing system under pressure: and appropriate servomotor. By means of these servomotors operating forces of the order of a few to a dozen or so tons could be obtained.
  • the present invention relates to an hydraulic servomotor with air motor, which drives an hydraulic piston pump delivering the liquid to operating chamber of a plunger cylinder.
  • this design makes it impossible to use hydraulic pistons of pumps of a diameter less than 12 to 15 mm; thus this design cannot be used in constructing small-size motors for higher pressures of the order from 300 to 600 kg/cm, in which the diameter of the hydraulic piston is of the order of 4- to 8 mm.
  • a further drawback of the design of the hydraulic servomotor with air motor being known at present consists in the fact that the servomotor can operate only in a vertical position, since the fluid level in the plunger is free, while for the regular operation of the servomomotor a constant and perpendicular position of the fluid with respect to the plunger is required.
  • the purpose of this invention is to eliminate the above mentioned drawbacks and to develop such a design of hydraulic servomotors with air motors, which will permit application of a wide range of diameters of hydraulic pistons, beginning with the values of the order 2 to 3 mm and will ensure at the same time an unchanged position of the fluid level with regard to the plunger.
  • the pneumatic conduit feeding the compressed air to the upper space of the hollow plunger has been made in the lateral wall surrounding the recess in which the piston of the hydraulic pump is moving.
  • the fluid has been separated from the compressed air by a baffle in a form of a tightly fitting piston sliding on the inner surface of the plunger and the outer surface of the pneumatic conduit.
  • the hydraulic servomotor with air motor being so designed will permit using it not only for lifting devices,
  • FlG. ll represents the longitudinal half-section of the hydraulic servomotor with air motor, while MG. 2 shows the cross-section through the outlet,
  • valves of fluid being pumped are actuated.
  • the servomotor consists of the housing 31 inside which the hollow plunger 2% is located, provided in its lower part a flanged insert 2% supported by the locating ring 29.
  • a flanged insert 2% supported by the locating ring 29.
  • the orifice of the flanged insert 28 is located slidably the elongated part of the baffle 27 provided with the inlet valve of the fluid, which valve consists of ball l3, pin lid and spring 15 and with the outlet valve of the fluid consisting of steel balls 17 resting on ring 1d.
  • the inlet valve cuts off the space 12 connected with the space lll from the space of the cylinder in, while the outlet valve cuts off the space beneath the plunger l9 from the space of the cylinder lid.
  • the hydraulic piston 22 is located provided with a hollow with the bottom 36.
  • the annular groove 3% connected with the orifice 25 is provided in the cylindrical orifice in which the piston 22 moves.
  • the piston 22 is driven in the operating direction by the piston of the air motor 2 located in the cylinder 5 having on the outer surface the conduit groove connected with orifice d in the cylinder bottom with orifice El leading to the conduit feeding the motor ll.
  • conduit groove 6 is connected by means of the conduit 7 and the tube with the upper surface of the hollow of the plunger 9, in which the pneumatic-hydraulic piston lltl is located.
  • the plunger On the outer surface of the plunger the peripheral groove is provided, in which the sealing ring 33 is placed.
  • the plunger has two different diameters-32 and 3t, whereby the ring space 37 contained between these diameters is permanently connected with the pneumatic conduit supplying the motor by means of the orifice 3b in the in the housing Eli and a conduit (not shown) connecting the orifice 3b and the supply conduit l.
  • the hydraulic space of the plunger Ill is connected by means of conduits hdflfland M with the high-pressure space 19 beneath the plunger.
  • the space M can be separated from the space 19 by cutting off with the needle 5.23 the orifice 25 from the orifice 2d.
  • the peripheral grooveild is provided which is connected by orifices 25 and 2b with the hydraulic space of the plunger ll.
  • the compressed air fed to the conduit 1 penetrates to the air motor 2 and at the same time through the orifice 3 in the conduit l to the conduit 4 in the bottom of the cylinder 5 of the motor 2, then, through the groove 6 to the conduit '7 and further 5 through the tube 8 to the space 9 above the pneumatichydraulic piston 10.
  • the motor 2 On account of the initially low pressure of the compressed air inside the servomotor, the motor 2 still does not operate, but the pneumatic hydraulic piston 10 presses the fluid contained in the space 11, due to which the fluid in the orifice 12 deflects the ball 13 supported by the pin 14 and spring 15 and penetrates to the space 16.
  • the pressure of the compressed air increases and the motor 2 is set into motion.
  • the piston of the motor 2 presses upon the piston 22 and pushes it into the space 16, involving therein a high pressure, due to which the fluid, in the way described previously, penetrates into the space 19 and imparts to the plunger 20 the operating movement under load.
  • the compressed air contained in the space 37 acts permanently upon the plunger in the backward sense.
  • the slidable insert 28 supported by the locating ring 29 has been transversely mounted.
  • An hydraulic servomotor comprising:
  • baffle mounted in said housing and having an elongated axial portion and a recessed area defined in said elongated axial portion, said baffle defining with the walls of said housing first and second hollow interior portions;
  • a hollow plunger mounted in said first hollow interior portion coaxially with said elongated axial portion;
  • connecting means connecting said plunger to said elongated portion for slidable movement of said plunger along said elongated portion
  • first conduit means for supplying air to said motor
  • a piston member mounted in said hollow plunger and defining together with the walls of said plunger a third space, said piston member further defining said first space on the opposite side of said piston member from said third space;
  • third conduit means for communicating said second passageway with said third space.
  • conduit means connecting said first space with said recessed are defined in said elongated axial portion;
  • valve means disposed adjacent the one end of said further conduit means in communication with said recessed area and in engagement therewith, said valve means comprising a ball member and resilient means resiliently urging said ball member into sealing engagement with said one end of said further conduit means, and said resilient means being mounted for engagement with said hydraulic piston.
  • a flanged member disposed in said opening and supported by said annular member and mounted concentrically on said elongated axial portion for slidable movement integrally with said hollow plunger.
  • a servomotor as defined in claim 1 wherein said bafile comprises a hollow cylindrical portion in which said hydraulic piston is mounted for axial movement into and out of said recessed area; an annular groove formed in the walls of said cylindrical portion, and further conduit means defined in said baffle for com municating said annular groove with said second space.
  • said hollow plunger comprises two portions having difierent diameters; the larger diameter corresponding substantially to the internal diameter of said first hollow interior portion, the smaller diameter portion of said plunger defining together with the inside wall of said first hollow interior portion a conduit in permanent communication with said first conduit means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Hydraulic Motors (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
US90341A 1969-11-21 1970-11-17 Hydraulic servomotor with air motor Expired - Lifetime US3686856A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL13703069A PL80403B3 (fr) 1969-11-21 1969-11-21

Publications (1)

Publication Number Publication Date
US3686856A true US3686856A (en) 1972-08-29

Family

ID=19950994

Family Applications (1)

Application Number Title Priority Date Filing Date
US90341A Expired - Lifetime US3686856A (en) 1969-11-21 1970-11-17 Hydraulic servomotor with air motor

Country Status (7)

Country Link
US (1) US3686856A (fr)
AT (1) AT308327B (fr)
CS (1) CS172917B2 (fr)
DE (1) DE2056936B2 (fr)
FR (1) FR2068570B1 (fr)
HU (1) HU163544B (fr)
PL (1) PL80403B3 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US524184A (en) * 1894-08-07 John p
US2701551A (en) * 1952-02-20 1955-02-08 Westinghouse Air Brake Co Automatic air feed pressure control for rock drills
US3068841A (en) * 1961-01-13 1962-12-18 Robbins & Bendror Associates I Hydraulic pressure system
US3426649A (en) * 1963-11-29 1969-02-11 Rheinstahl Wanheim Gmbh Multistage hydraulic mine prop
US3511133A (en) * 1968-03-06 1970-05-12 Caterpillar Tractor Co Position control for hydraulic jacks

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US524184A (en) * 1894-08-07 John p
US2701551A (en) * 1952-02-20 1955-02-08 Westinghouse Air Brake Co Automatic air feed pressure control for rock drills
US3068841A (en) * 1961-01-13 1962-12-18 Robbins & Bendror Associates I Hydraulic pressure system
US3426649A (en) * 1963-11-29 1969-02-11 Rheinstahl Wanheim Gmbh Multistage hydraulic mine prop
US3511133A (en) * 1968-03-06 1970-05-12 Caterpillar Tractor Co Position control for hydraulic jacks

Also Published As

Publication number Publication date
FR2068570B1 (fr) 1973-02-02
AT308327B (de) 1973-06-25
CS172917B2 (fr) 1977-01-28
HU163544B (fr) 1973-09-27
DE2056936A1 (de) 1971-06-16
DE2056936B2 (de) 1977-02-17
PL80403B3 (fr) 1975-08-30
FR2068570A1 (fr) 1971-08-27

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