[go: up one dir, main page]

EP0051014B1 - Vorrichtung für die kontinuierliche Verstellung der Hublänge eines Arbeitszylinders - Google Patents

Vorrichtung für die kontinuierliche Verstellung der Hublänge eines Arbeitszylinders Download PDF

Info

Publication number
EP0051014B1
EP0051014B1 EP81401613A EP81401613A EP0051014B1 EP 0051014 B1 EP0051014 B1 EP 0051014B1 EP 81401613 A EP81401613 A EP 81401613A EP 81401613 A EP81401613 A EP 81401613A EP 0051014 B1 EP0051014 B1 EP 0051014B1
Authority
EP
European Patent Office
Prior art keywords
piston
chamber
rod
cam
cylinder
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
EP81401613A
Other languages
English (en)
French (fr)
Other versions
EP0051014A1 (de
Inventor
Roger Jarniac
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
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 Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP0051014A1 publication Critical patent/EP0051014A1/de
Application granted granted Critical
Publication of EP0051014B1 publication Critical patent/EP0051014B1/de
Expired legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
    • 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
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/16—Systems essentially having two or more interacting servomotors, e.g. multi-stage
    • 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
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
    • F15B9/08—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor
    • F15B9/10—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor in which the controlling element and the servomotor each controls a separate member, these members influencing different fluid passages or the same passage

Definitions

  • the present invention relates to a device allowing a continuous adjustment of the stroke of the piston of a jack, applicable in particular in the case of a differential piston.
  • Figure 4 of this document illustrates a variant in which the piston has the shape of a cam integral with its rod and making an angle other than 90 ° with the latter. The cam thus separates the cylinder containing the piston into two compartments while a pressurized fluid inlet opens into this cylinder.
  • the shape of the cam is such that during the rotation of the shaft, the fluid inlet opens either in one compartment or in the other. A continuous back and forth movement of the piston is thus obtained, but the amplitude of this movement is determined once and for all by the shape of the cam.
  • compressed air is sent to each of the ends of the cylinder containing the piston.
  • Several discharge orifices closed by valves themselves controlled by solenoids, are distributed along this cylinder. The opening of one of these valves causes the evacuation of the compressed gas and therefore a vacuum on one side of the cylinder. The piston then moves back to the level of the selected orifice.
  • a step-by-step adjustment of the piston stroke is thus obtained by the choice of one of the discharge orifices, but, in all possible levels, the amplitude of the stroke remains the same since it is determined by the shape of the cam constituting the piston. It is not possible to adjust this amplitude continuously and, moreover, such a device is quite complex, and therefore costly to produce, because the discharge orifices can be quite numerous and each valve is controlled by a solenoid.
  • the object of the present invention is precisely to eliminate these drawbacks by proposing a simple device which makes it possible to continuously vary the stroke of the piston.
  • this piston forming part of a cylinder comprising a control member movable relative to the piston, at least part of this control member being in the form of a rod movable in rotation and in translation
  • this rod comprises an extension having the form of a differential piston movable in rotation and in translation inside a cylinder and defining inside thereof a chamber with a large section and a chamber with a small section, the latter being permanently in communication with a source of fluid under high pressure by means of an orifice provided in the wall of said cylinder, the piston differential having an internal cavity inside which is disposed a second rod immobilized in translation and being able to be angularly oriented, said second rod being provided with a cam having two edges o positioned, this cam being able to uncover and seal cyclically, during the rotation of the differential piston, on the one hand at least a first orifice formed in the wall of the piston and putting the large
  • the second rod has a cavity which allows, thanks to one of said orifices, to put the large-section chamber in communication with a fluid discharge.
  • said differential piston comprises an outer wall on which are hollowed out at least two grooves, the ends of one of these grooves opening into one of said orifices and into the chamber with a large section respectively , the ends of the other groove opening respectively into the other orifice and into the small section chamber.
  • the jack shown in FIGS. 2 to 4 comprises a tubular cylindrical body 1 in the axial bore of which a piston 2 is slidably mounted which thus defines two opposite chambers respectively referenced 3 and 4.
  • This piston 2 is itself provided in the form tubular, the axial housing 5 thus determined extending partially inside the motor member 6 operated by said piston.
  • the drive member 6 having a diameter greater than that of the shaft 7, the piston 2 can be described as 'differential'.
  • chamber 3 will hereinafter be called “with small section” while chamber 4 will be “with large section”.
  • the small-section chamber 3 is permanently connected to a source of fluid under high pressure by means of two opposite radial slots 11. Moreover, the shaft 7 extends beyond the discharge slots 10 to exit axially of the cylinder 1 of the jack and receive the drive of a motor 12 associated with an appropriate transmission 13.
  • this shaft 7 which is engaged in the housing 5 is solilitary, by machining or by fixing a cam 14 whose figure 5 shows the profile clearly; in the example considered, it is a double sinusoidal profile which extends symmetrically in two parts around the cylinder formed by said shaft.
  • This 1z cam. opposes the communication of the large section chamber 4 with the discharge channel 8, and its two opposite edges are intended to form shutters for two pairs of radial orifices 15 and 16, drilled in the thickness of the piston 2; each of the orifices 15 is connected by a peripheral groove 17 to the chamber with large section 4, while similar grooves 18 ensure the communication of the orifices 16 with the chamber with small section 3, it being understood that these two pairs of grooves 17 and 18 are profiled so as not to intersect.
  • the motor 12 is started and drives the shaft 7 and the cam 14 in the dextrorotatory direction, the edge or lower part of said cam will discover the two orifices 16; the hydraulic fluid can thus pass from the chamber 3 to the chamber 4 through the aforementioned orifices and the grooves 18.
  • the chamber 4 having a larger useful section, the piston 2 moves upwards.
  • this axial displacement of the piston tends to bring the orifices 16 below the lower edge of the cam 14, but as the latter is rotated, said orifices remain uncovered as long as this cam has not - made a 90 ° rotation.
  • the orifices 16 are closed by the lower edge of the cam 14, while the upper edge of the latter uncovers the two orifices 15.
  • the chamber 4 is thus placed in communication with the bass pressure through the grooves 17, the orifices 15, the channel 8 and the ports 10, while the high pressure is exerted on the upper face of the piston which, consequently, moves downwards.
  • This downward movement of the piston 2 and of the member 6 will continue for a time corresponding to a 90 ° rotation of the shaft 7, so that things will end up in the position of FIG. 2, and that a new operating cycle may then occur.
  • Figure 1 shows how such an actuator can be associated with an adjustment device according to 1, invention.
  • the piston 22 is similar to the piston 2; it is slidably mounted in a cylinder 21 provided with lights 31 and 30 respectively connected to the high and to the low pressures of the general installation.
  • the piston 22 is a differential piston which delimits in the cylinder 21 a chamber 23 with a small section and a chamber 24 with a large section.
  • a cam 34 carried by a second rod 27 which is not driven in a rotational movement: this shaft 27 protrudes beyond the free transverse face of the cylinder 21 to be equipped a member allowing the adjustment of its orientation, which member has been shown diagrammatically in the form of a lever 19.
  • There are also on the piston 22 orifices 35, 36 and grooves 37, 38 which play the same role as the holes 15, 16 and the grooves 17, 18 of the piston 2.
  • the extension 40 of the rod 7 must be rotated by the motor 12 without this drive being able to oppose its axial displacement under the effect of the piston 22.
  • the transmission interposed between the motor 12 and the part 40 is therefore formed by two pinions or toothed wheels 41 with straight teeth.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Actuator (AREA)

Claims (3)

1. Vorrichtung für die kontinuierliche Verstellung der Hublänge eines Arbeitszylinders (2) einer Hubvorrichtung wobei letztere ein gegenüber dem Kolben (2) bewegliches Steuerorgan enthält, von welchem Steuerorgan wenigstens ein Teil sich in Form einer drehbaren und in Längsrichtung beweglichen Stange (7) darstellt, dadurch ge- kennzeichnet, daß diese Stange (7) eine Verlängerung enthält, die die Form eines Differentialkolbens (22) aufweist, der im Innern eines Zylinders (21) drehbar und in Längsrichtung beweglich angeordnet ist und im Innern desselben eine Kammer großen Querschnitts (24) und eine Kammer kleinen Querschnitts (23) begrenzt, wobei letztere ständig mit einer Hochdruckfluidquelle über eine Öffnung (31) in Verbindung steht, die in der Wand des Zylinders (21) vorgesehen ist, der Differentialkolben (22) einen inneren Hohlraum (25) aufweist, in welchem eine zweite Stange (27) angeordnet ist, die in Längsrichtung unbeweglich ist und die im Winkel verstellt werden kann, wobei die genannte zweite Stange (27) mit einer Nockenfläche (34) versehen ist, die zwei gegenüberstehende Ränder aufweist und im Verlaufe der Drehung des Differentialkolbens (22) einerseits wenigstens eine in der Wand des Kolbens (22) ausgebildete Öffnung (35) zyklisch Öffnen und verschließen kann und die Kammer großen Querschnitts (24) mit der Kammer kleinen Querschnitts (23) in Verbindung setzt und andererseits wenigstens eine in der Wand des Kolbens (22) ausgebildete Öffnung (36) Öffnen und verschließen kann und die Kammer großen Querschnitts (24) mit einem Fluidabsaugsystem in Verbindung setzt.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die zweite Stange (27) einen Hohlraum (28) aufweist, der es dank der einen (36) der Öffnungen gestattet, die Kammer großen Querschnitts (24 mit einer Fluidabsaugung (30) in Verbindung zu bringen.
3. Vorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß der Differentialkolben (22) eine Außenwand aufweist, in die wenigstens zwei Rillen (37, 38) eingegraben sind, wobei die Enden der einen (37) dieser Rillen in die eine (35) der genannten Öffnungen bzw. in die Kammer großen Querschnitts (24) münden und die Enden der anderen Rille (38) in die andere Öffnung (36) bzw. die Kammer kleinen Querschnitts (23) münden.
EP81401613A 1980-10-23 1981-10-15 Vorrichtung für die kontinuierliche Verstellung der Hublänge eines Arbeitszylinders Expired EP0051014B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8023066 1980-10-23
FR8023066A FR2492909A1 (fr) 1980-10-23 1980-10-23 Perfectionnements aux verins hydrauliques d'actionnement a commande programmee

Publications (2)

Publication Number Publication Date
EP0051014A1 EP0051014A1 (de) 1982-05-05
EP0051014B1 true EP0051014B1 (de) 1986-02-05

Family

ID=9247427

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81401613A Expired EP0051014B1 (de) 1980-10-23 1981-10-15 Vorrichtung für die kontinuierliche Verstellung der Hublänge eines Arbeitszylinders

Country Status (8)

Country Link
US (1) US4426912A (de)
EP (1) EP0051014B1 (de)
JP (1) JPS5798498A (de)
KR (1) KR830007421A (de)
AU (1) AU543842B2 (de)
DE (1) DE3173730D1 (de)
FR (1) FR2492909A1 (de)
YU (1) YU252181A (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1067293A3 (de) * 1999-07-09 2003-11-19 Parker Hannifin Corporation Elektrohydraulisches Stellglied und Regelungsverfahren eines Stellglieds
US6995585B2 (en) 2003-08-05 2006-02-07 International Business Machines Corporation System and method for implementing self-timed decoded data paths in integrated circuits
US20160333901A1 (en) * 2015-05-15 2016-11-17 Triumph Engine Control Systems, Llc Fail fixed actuator
CN112830412B (zh) * 2020-12-31 2022-04-05 上海同力建设机器人有限公司 半自动快速换手升降装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2898890A (en) * 1957-07-16 1959-08-11 Ibm Motion transmitting device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR464891A (fr) * 1912-11-27 1914-04-02 Octave Brotelle Tampon en feutre antiseptisé muni de bandes emplastiques, servant de bandage herniaire
US3368457A (en) * 1964-08-19 1968-02-13 Chrysler Corp Hydraulic control arrangement

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2898890A (en) * 1957-07-16 1959-08-11 Ibm Motion transmitting device

Also Published As

Publication number Publication date
US4426912A (en) 1984-01-24
AU7650881A (en) 1982-04-29
YU252181A (en) 1984-02-29
AU543842B2 (en) 1985-05-02
FR2492909A1 (fr) 1982-04-30
DE3173730D1 (en) 1986-03-20
KR830007421A (ko) 1983-10-21
FR2492909B3 (de) 1983-09-16
JPS5798498A (en) 1982-06-18
EP0051014A1 (de) 1982-05-05

Similar Documents

Publication Publication Date Title
EP0460988B1 (de) Steuervorrichtung mit Nockenwelle und Kraftübertragungsmittel mit Rolle
EP0051014B1 (de) Vorrichtung für die kontinuierliche Verstellung der Hublänge eines Arbeitszylinders
FR2908451A1 (fr) Turbopropulseur comportant un ensemble de pales a orientation reglable
FR2678330A1 (fr) Dispositif pour arbre a cames comprenant au moins une came pouvant etre desactivee.
FR2657117A1 (fr) Dispositif a arbre a cames et son procede de fabrication.
FR2468771A1 (fr) Dispositif de commande d'aspiration pour un compresseur
EP0271516A1 (de) Ventil zum verteilen von flüssigkeiten.
FR2518646A1 (fr) Moteur a combustion a piston rotatif
FR2836955A1 (fr) Systeme de commande des soupapes pour un moteur a combustion interne
EP0022021B1 (de) Hydraulikmotor mit hin- und hergehendem Kolben
EP0604888B1 (de) Dickstoffpumpe mit einem Drehschieberarmatur
FR2986558A1 (fr) Dispositif de commande variable d'au moins une soupape, par exemple pour un moteur alternatif
EP0165281A1 (de) Druckluft-durchflussbegrenzer.
FR2803005A1 (fr) Tendeur hydraulique pour lien sans fin, systeme de distribution comprenant un tel tendeur et moteur equipe d'un tel systeme de distribution
BE1005985A3 (fr) Dispositif pour distribution rotative.
FR2721684A1 (fr) Pompe doseuse d'huile pour moteurs à deux temps.
FR2659695A1 (fr) Pompe hydraulique munie d'un clapet de pompe.
FR2789626A1 (fr) Dispositif d'obturation de trous de passage d'air dans un cylindre, notamment pour les cylindres supports et les manchons de compensation
FR2783451A1 (fr) Robot de manipulation d'un objet
FR2501392A1 (fr) Dispositif pour la commande et la regulation en position lineaire d'un arbre tournant
FR2857702A1 (fr) Injecteur de carburant pour moteur a debit commandable
FR2654793A3 (fr) Dispositif de commande d'une boite de changement de vitesses d'un vehicule tel qu'en particulier un tracteur agricole.
BE623247A (de)
FR2729710A1 (fr) Impulseur reglable ayant un mecanisme de reglage monte a l'interieur
FR2498261A1 (fr) Perfectionnements aux pompes hydrauliques a pistons radiaux

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR SE

17P Request for examination filed

Effective date: 19821008

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): DE FR SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19860228

REF Corresponds to:

Ref document number: 3173730

Country of ref document: DE

Date of ref document: 19860320

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19870630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19870701

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EUG Se: european patent has lapsed

Ref document number: 81401613.5

Effective date: 19860212