GB706366A - Improvements in or relating to fluid-pressure servo-motors - Google Patents

Improvements in or relating to fluid-pressure servo-motors

Info

Publication number
GB706366A
GB706366A GB26546/51A GB2654651A GB706366A GB 706366 A GB706366 A GB 706366A GB 26546/51 A GB26546/51 A GB 26546/51A GB 2654651 A GB2654651 A GB 2654651A GB 706366 A GB706366 A GB 706366A
Authority
GB
United Kingdom
Prior art keywords
piston
cylinder
pipe
stroke
gaseous fluid
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
Application number
GB26546/51A
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.)
M A F SOC CIV ILE D ETUDES POU
Original Assignee
M A F SOC CIV ILE D ETUDES POU
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 M A F SOC CIV ILE D ETUDES POU filed Critical M A F SOC CIV ILE D ETUDES POU
Publication of GB706366A publication Critical patent/GB706366A/en
Expired legal-status Critical Current

Links

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
    • F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
    • F15B11/072—Combined pneumatic-hydraulic systems
    • F15B11/0725—Combined pneumatic-hydraulic systems with the driving energy being derived from a pneumatic system, a subsequent hydraulic system displacing or controlling the output element
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Reciprocating Pumps (AREA)

Abstract

706,366. Pneumatic single stroke apparatus. M.A.F. SOC. CIVILE D'ETUDES POUR MATERIEL DE FONDERIE. Nov. 13, 1951 [Nov. 15, 1950], No. 26546/51. Class 8 (2). [Also in Groups XXII and XXIX] A fluid pressure reciprocating motor, used in particular for opening chilled casting moulds, has a pneumatically actuated member coupled directly to the part to be moved and a hydraulically operated member connected through a lost-motion connection with the pneumatic member, whereby the hydraulic member is used for producing a high power output for part of the operative cycle of the servomotor, in particular for initially separating the moulds and the pneumatic member is used for producing a low power output for a part of said cycle. The motor comprises coaxial cylinders 1, 2 containing pistons 3, 4 respectively actuated by gaseous fluid. The piston 3 is connected to a device to be operated. An annular space 11 containing liquid communicates through a duct 11' with the internal space 7<SP>1</SP> movable in an intermediate cylinder 5<SP>1</SP>. The space 7<SP>1</SP> communicates through ports 12 with an annular space 13. Gaseous fluid under the control of a manually or automatically operated distributer is admitted through a pipe 22 and moves the piston 4 to the right whereupon a plunger portion 10 thereof enters the space 7<SP>1</SP> and pressurises the liquid trapped therein which acts differentially on the piston 7 and moves it to left.. The latter is connected by a rod 8 with the piston 3 which is thus moved simultaneously to commence its power stroke and first uncovers a port 20". The elastic fluid in the cylinder 1 thus acts through a conduit 20 on the right hand side of the piston 3 and assists its movement to the left. Movement of the piston 7 is stopped by its engagement with the left hand end of its cylinder whereupon the piston 3 moves alone to complete the power stroke. During the latter a pipe 23 is open to exhaust. The return stroke is effected by admitting gaseous fluid to the pipe 23 and opening to exhaust the pipe 22. Towards the end of its return stroke the piston 3 engages a head 9 on the rod 8 and returns the piston 7. In another embodiment the admission of gaseous fluid to the cylinder 1 is delayed until the piston 4 has moved a considerable distance in its cylinder and the initial separating movement of the nioulds is effected by liquid-pressure only. The hydraulic piston 7 may be'effective during the whole of the power stroke.
GB26546/51A 1950-11-15 1951-11-13 Improvements in or relating to fluid-pressure servo-motors Expired GB706366A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR296107X 1950-11-15

Publications (1)

Publication Number Publication Date
GB706366A true GB706366A (en) 1954-03-31

Family

ID=8888147

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26546/51A Expired GB706366A (en) 1950-11-15 1951-11-13 Improvements in or relating to fluid-pressure servo-motors

Country Status (4)

Country Link
US (1) US2601761A (en)
CH (1) CH296107A (en)
DE (1) DE930305C (en)
GB (1) GB706366A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1329584A (en) * 1961-07-08 1963-06-14 Two-stage pressure multipliers for compressing true fluids, liquids and gases
US3948051A (en) * 1974-08-01 1976-04-06 Marshall Don J Fluid pressure amplifier
CA2102762A1 (en) * 1993-11-09 1995-05-10 Viljo K. Valavaara Two-stage pressure cylinder
US9926947B2 (en) * 2014-05-09 2018-03-27 Montana Hydraulics, LLC Air-to-hydraulic fluid pressure amplifier

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US825301A (en) * 1903-08-05 1906-07-10 Edwin D Coddington Hydropneumatic press.
US2365536A (en) * 1939-11-18 1944-12-19 Chicago Pneumatic Tool Co Hydraulic power plant
US2319950A (en) * 1940-01-18 1943-05-25 Gen Steel Castings Corp Pneumatic-hydraulic pressure device
US2324149A (en) * 1940-08-27 1943-07-13 Corning Glass Works Hydropneumatic press
US2432088A (en) * 1942-03-19 1947-12-09 Valve Engineering Company Pressure actuated valve
US2396778A (en) * 1942-04-09 1946-03-19 Hydraulic Dev Corp Inc Core controlling device for casting
US2396539A (en) * 1943-01-25 1946-03-12 E M B Co Ltd Pressure intensifying mechanism
FR929959A (en) * 1946-07-04 1948-01-13 Hydraulic transmission for all applications

Also Published As

Publication number Publication date
CH296107A (en) 1954-01-31
DE930305C (en) 1955-07-14
US2601761A (en) 1952-07-01

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