EP0004483A1 - Hydraulikzylinder mit Hubregulierung - Google Patents

Hydraulikzylinder mit Hubregulierung Download PDF

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Publication number
EP0004483A1
EP0004483A1 EP79400037A EP79400037A EP0004483A1 EP 0004483 A1 EP0004483 A1 EP 0004483A1 EP 79400037 A EP79400037 A EP 79400037A EP 79400037 A EP79400037 A EP 79400037A EP 0004483 A1 EP0004483 A1 EP 0004483A1
Authority
EP
European Patent Office
Prior art keywords
pressure
orifices
actuator
cylinder
drawer
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.)
Withdrawn
Application number
EP79400037A
Other languages
English (en)
French (fr)
Inventor
Jean-François Louviot
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.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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 Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Publication of EP0004483A1 publication Critical patent/EP0004483A1/de
Withdrawn legal-status Critical Current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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F15B15/224—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston which closes off fluid outlets in the cylinder bore by its own movement

Definitions

  • the object of the invention is a linear actuator of this type, but with regulated speed and regulated deceleration which, throughout its operating stroke, in acceleration, constant speed and deceleration, or with regulated hydraulic flow and therefore insensitive to the jolts of its operating load.
  • a flow regulator of a type known per se the pilot piston of which balances, on the one hand, the discharge pressure downstream of the multiple holes, increased by that of a spring of calibration, on the other hand, with the pressure upstream of these holes, that is to say the discharge pressure of the jack.
  • the pilot piston of which balances, on the one hand, the discharge pressure downstream of the multiple holes, increased by that of a spring of calibration, on the other hand, with the pressure upstream of these holes, that is to say the discharge pressure of the jack.
  • the same regulator whose pressure of the calibration spring is added to the highest pressure upstream of the multiple holes, causes the pilot piston to sink fully. In this sense, the effect of the flow regulator is therefore eliminated.
  • the subject of the invention relates to a hydraulic cylinder with regulated stroke, of the type with multiple orifices for passage of the fluid, successively masked or unmasked by the piston in the acceleration or deceleration races, characterized in that regulators flow, of a type known per se, comprising a sliding drawer balanced by a calibration spring, are arranged on the actuator supplies, said drawer regulating the evacuation rate of the actuator in equilibrium position, of go, on one of these end faces, the pressure in the cylinder upstream of the multiple discharge orifices and, on the other hand, on the other face, the pressure downstream of said orifices, increased by the pressure of the calibration spring , controlling, on this face, the opening of the cylinder discharge flow.
  • the regulator drawer disposed at the other end of the jack is then, due to the reversal of the direction of the pressure drops in the multiple orifices, pushed back to the bottom of the housing and inactive.
  • the conduit ensuring communication between the end of the cylinder and the end face of the drawer, putting them at the same delivery pressure upstream of the multiple orifices, may comprise a throttling nozzle damping the movements of the drawer.
  • the jack comprises at the front and rear ends, on the one hand, a jacket 1, 101, pierced with several holes 19, 20, 21, 22, 23, 24 and forming the multiple orifices aforementioned, on the other hand, a flow control block 2, 102.
  • the jack further comprises a piston 3 long enough to be able to cover all the holes at one end of the cylinder and then, after displacement of itself, holes on the other opposite end of the cylinder.
  • the regulation blocks 2, 102 being identical at the two ends of the jack, the description will now be made with reference to that placed on the rear bottom side 2.
  • This block 2 comprises a piston 4 sliding in a bore 5 communicating with the supply orifice 6 of the block 2 and the bore 7 communicating itself with the supply orifice of the jack 8.
  • a cap 9 crossed by a screw 10 pushing itself a spring 11; this spring presses the piston 4 against the face 12; this face communicates via a channel 13 in the block 2 of a nozzle 14 and a channel 15 in the bottom 16 of the jack to the internal chamber 17 of the jack.
  • the bottom 16 of the jack has an annular recess 18 which collects the flow rate from the holes 19, 20, 21, 22, 23, 24.
  • the cylinder is moved by a pressure difference between chambers 17 and 25.
  • the cylinder In operation, the cylinder being in position A and moving in the direction of arrow C, the delivery flow passes through the holes 19, 20, 21, 22, 23, 24, the bore 7, the bore 5 and orifice 6. All of the holes causes a pressure drop which affects the faces of the piston.
  • the pressure in the chamber 17 greater than that of the chamber 18 corresponds to a pressure in the chamber 12 of the regulator greater than the pressure in the chamber 5, which closes the piston until a throttle 26 which limits the flow.
  • the piston obtains an equilibrium position when the pressure at 12 is equal to the pressure at 5 increased by that of the action of the spring R. If the flow tends to increase, the piston tends to close and decrease the flow .
  • the maximum flow therefore depends only on the holes 19, 20, 21, 22, 23, 24 and on the setting R of the spring 11.
  • the holes regulate a maximum flow. If the driving pressure drops below the minimum pressure drop of the system at the desired speed, the flow drops to find another balance.
  • the nozzle 14 serves to dampen the displacements of the piston 4.
  • Regulation of the jack is thus obtained by coupling a flow regulator with internal calibrated orifices and a variable flow according to the position of the piston and therefore the number of holes open to the flow.
  • the difference in force of the piston spring allows a greater pressure drop for small flows, which makes it possible to calculate the last holes as a function of this increasing pressure drop and therefore of reducing their size in order to better regulate the acceleration in the opposite direction.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Actuator (AREA)
EP79400037A 1978-03-20 1979-01-23 Hydraulikzylinder mit Hubregulierung Withdrawn EP0004483A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7807937 1978-03-20
FR7807937A FR2420674A1 (fr) 1978-03-20 1978-03-20 Verin hydraulique a course regulee

Publications (1)

Publication Number Publication Date
EP0004483A1 true EP0004483A1 (de) 1979-10-03

Family

ID=9206009

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79400037A Withdrawn EP0004483A1 (de) 1978-03-20 1979-01-23 Hydraulikzylinder mit Hubregulierung

Country Status (3)

Country Link
EP (1) EP0004483A1 (de)
ES (1) ES477298A1 (de)
FR (1) FR2420674A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981003314A1 (en) * 1980-05-16 1981-11-26 Rockwell International Corp Controlled output force actuator
US5107677A (en) * 1987-05-21 1992-04-28 Vertran Manufacturing Company Hydraulic door actuator
US5161957A (en) * 1987-05-21 1992-11-10 Vertran Manufacturing Company Hydraulic door actuator
EP0617202A1 (de) * 1993-02-22 1994-09-28 Fibro GmbH Vorrichtung zur Endlagendämpfung eines bewegten Systems
GB2347176A (en) * 1998-11-06 2000-08-30 Smc Corp Piston cushioning mechanism for air cylinder.
DE112017002483B4 (de) 2016-06-16 2023-10-12 Qingdao Acme Innovation Technology Co., Ltd. Hydraulischer puffer und mit demselben kombinierter zylinder

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3054384A (en) * 1961-01-12 1962-09-18 Cessna Aircraft Co Piston velocity governor
DE2326417A1 (de) * 1973-05-24 1974-12-12 Beukenberg Maschf Hydraulik-zylinder fuer bergwerks- und industriemaschinen
US4033235A (en) * 1976-01-26 1977-07-05 Caterpillar Tractor Co. Fluid operated ram

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3054384A (en) * 1961-01-12 1962-09-18 Cessna Aircraft Co Piston velocity governor
DE2326417A1 (de) * 1973-05-24 1974-12-12 Beukenberg Maschf Hydraulik-zylinder fuer bergwerks- und industriemaschinen
US4033235A (en) * 1976-01-26 1977-07-05 Caterpillar Tractor Co. Fluid operated ram

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981003314A1 (en) * 1980-05-16 1981-11-26 Rockwell International Corp Controlled output force actuator
US4399968A (en) * 1980-05-16 1983-08-23 Rockwell International Corporation Controlled output force actuator
US5107677A (en) * 1987-05-21 1992-04-28 Vertran Manufacturing Company Hydraulic door actuator
US5161957A (en) * 1987-05-21 1992-11-10 Vertran Manufacturing Company Hydraulic door actuator
EP0617202A1 (de) * 1993-02-22 1994-09-28 Fibro GmbH Vorrichtung zur Endlagendämpfung eines bewegten Systems
GB2347176A (en) * 1998-11-06 2000-08-30 Smc Corp Piston cushioning mechanism for air cylinder.
GB2347176B (en) * 1998-11-06 2001-01-24 Smc Corp Air cylinder with cushion mechanism
US6279451B1 (en) 1998-11-06 2001-08-28 Smc Corporation Air cylinder with cushion mechanism
DE112017002483B4 (de) 2016-06-16 2023-10-12 Qingdao Acme Innovation Technology Co., Ltd. Hydraulischer puffer und mit demselben kombinierter zylinder

Also Published As

Publication number Publication date
ES477298A1 (es) 1979-07-01
FR2420674A1 (fr) 1979-10-19

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): BE CH DE GB IT LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn
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Inventor name: LOUVIOT, JEAN-FRANCOIS