FR2498285A1 - Hydraulic distributor e.g. for hydraulic jack - has piezoelectrical piston acting on valve ball to stop liq. flowing - Google Patents

Hydraulic distributor e.g. for hydraulic jack - has piezoelectrical piston acting on valve ball to stop liq. flowing Download PDF

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Publication number
FR2498285A1
FR2498285A1 FR8100849A FR8100849A FR2498285A1 FR 2498285 A1 FR2498285 A1 FR 2498285A1 FR 8100849 A FR8100849 A FR 8100849A FR 8100849 A FR8100849 A FR 8100849A FR 2498285 A1 FR2498285 A1 FR 2498285A1
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France
Prior art keywords
piston
hydraulic distributor
distributor
hydraulic
ball
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Granted
Application number
FR8100849A
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French (fr)
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FR2498285B3 (en
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Individual
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Individual
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Priority to FR8100849A priority Critical patent/FR2498285A1/en
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Publication of FR2498285B3 publication Critical patent/FR2498285B3/fr
Granted legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/004—Actuating devices; Operating means; Releasing devices actuated by piezoelectric means
    • F16K31/007—Piezoelectric stacks

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrically Driven Valve-Operating Means (AREA)

Abstract

The distributor can be used, for example, as a secondary distributor on the output pipe of a hydraulic jack. The hydraulic distributor has a control component formed by a main piston, made from a piezo-electric ceramic, which acts on a ball used as a valve. When an electrical generator is turned off, this piezo-electric piston impedes the flowing of the liquid. In one application, the valve ball is acted upon by means of a secondary piston which is in contact with the electrical insulator of the main piston (1). In another application, the valve ball and secondary piston are replaced by a single component in the shape of a full funnel.

Description

L'invention concerne un distributeur hydraulique à commande piézoélectrique. The invention relates to a hydraulic distributor with piezoelectric control.

On sait que pour commander des vérins hydrauliques on peut associer au distributeur principal de commande des distributeurs secondaires installés sur la conduite de retour, afin d'assurer des accélérations et décélérations définies, ceci notamment afin d'obtenir des arrêts sans chocs, en un point quelconque de la course de ces vérins. We know that to control hydraulic cylinders we can associate with the main control distributor secondary distributors installed on the return line, to ensure defined accelerations and decelerations, this in particular to obtain stops without shocks, at a point any of the stroke of these cylinders.

Ce système classique comporte des distributeurs à commande électromagnétique et de ce fait, les temps de réponse sont relativement longs. Il est connu que ces temps de réponse constituent un obstacle dans l'obtention d'arrêt de précision. This conventional system includes electromagnetically controlled distributors and therefore the response times are relatively long. It is known that these response times constitute an obstacle in obtaining precision stops.

Dans ce domaine, les travaux du demandeur sont connus. In this area, the work of the applicant is known.

Par exemple, un robot a été présenté au SITEV 1978 à Genève (Suisse). L'utilisation de ce robot, obtenue de façon très simple, grâce à l'Unité de Commande Programmable - brevet français nO 76 27532 du 16-05-1980, accordé au demandeur présentait une dispersion à l'arrêt due au système électromagnétique lui-mme. For example, a robot was presented at SITEV 1978 in Geneva (Switzerland). The use of this robot, obtained in a very simple way, thanks to the Programmable Control Unit - French patent no. 76 27532 of May 16, 1980, granted to the applicant had a dispersion when stopped due to the electromagnetic system itself. Mrs.

L'invention apporte une solution simple et économique à ce problème en ce qu'elle propose un distributeur hydraulique actionné par un piston moteur à effet piézoélectrique. The invention provides a simple and economical solution to this problem in that it provides a hydraulic distributor actuated by a piezoelectric effect motor piston.

Cet effet piézoélectrique, réversible, est observé dans les corps non conducteurs et se manifeste notamment par un allongement lorsque des charges électriques sont appliquées sur les faces de certains cristaux notamment.This reversible piezoelectric effect is observed in non-conductive bodies and is manifested in particular by an elongation when electrical charges are applied to the faces of certain crystals in particular.

La fréquence de résonnance de céramiques courantes est de l'ordre de 50 kHz, ce qui donne un temns d'élongation équivalent à 10 microsecondes. Or le temps de réponse d'un plongeur électromagnétique, est de l'ordre de 40 milli-secondes. On voit donc tout l'intérêt de ce nouveau produit. The resonance frequency of common ceramics is around 50 kHz, which gives an elongation rate equivalent to 10 microseconds. However, the response time of an electromagnetic plunger is of the order of 40 milli-seconds. So we can see the whole point of this new product.

Le distributeur selon l'invention est constitué d'un piston moteur, réalisé par une céramique à effet piézoélectrique, soulevant une bille-clapet lorsque les faces d'extrémités de la céramique sont soumises àune charge électrique et laissant retomber cette bille dès que le courant électrique est coupé.  The distributor according to the invention consists of a driving piston, produced by a ceramic with a piezoelectric effect, lifting a ball valve when the end faces of the ceramic are subjected to an electric charge and allowing this ball to drop as soon as the current electric is cut.

Les caractéristiques particulières et avantages de l'invention apparattront à la lecture de la description qui va suivre d'une forme de réalisation en référence au dessin annexé qui représente: - Figure 1 : Coupe du distributeur, - Figure 2 : Détail clapet monobloc, - Figure 3 : Schéma de montage hydraulique. The particular characteristics and advantages of the invention will appear on reading the following description of an embodiment with reference to the appended drawing which represents: - Figure 1: Section of the dispenser, - Figure 2: One-piece valve flap, - Figure 3: Hydraulic mounting diagram.

D'après la figure 1, le distributeur est constitué d'un piston céramique piézoélectrique 1 dont les extrémités 2 et 3 sont reliées au générateur de courant 4. According to FIG. 1, the distributor consists of a piezoelectric ceramic piston 1, the ends 2 and 3 of which are connected to the current generator 4.

Le corps 5 comportant le piston 1 reçoit un second piston 6 dont le diamètre est lié au diamètre de l'alésage 7 afin d'obtenir une section de passage annulaire bien définie. The body 5 comprising the piston 1 receives a second piston 6 whose diameter is linked to the diameter of the bore 7 in order to obtain a well defined annular passage section.

La bille 8 fait office de clapet sur le siège du support 5-1
Les joints toriques 9-1 à 9-4 assurent l'étanchéité.The ball 8 acts as a valve on the seat of the support 5-1
O-rings 9-1 to 9-4 provide sealing.

Les pièces 10-11-12-13 assurent l'isolement électrique du piston 1. On se réfère maintenant à la figure 3 qui montre comment le distributeur peut être utilisé. Le distributeur piézoélectrique sera par exemple le distributeur 18. Lorsque la bobine A du distributeur 14 est actionnée, l'huile venant de P fera rentrer la tige du vérin VI à une vitesse VT, les distributeurs 16-17-18 étant tous actionnés électriquement. En coupant l'alimentation de 16 on obtiendra une 2ème vitesse égale à VT/X, ensuite en coupant l'alimentation de 17 on obtiendra une troisième vitesse VT/Y et, en coupant l'alimentation sur 18 nous obtiendrons l'arrêt du mouvement avec une grande précision, les chocs ayant été éliminés par ailleurs.Parts 10-11-12-13 ensure the electrical isolation of the piston 1. We now refer to Figure 3 which shows how the distributor can be used. The piezoelectric distributor will be for example the distributor 18. When the coil A of the distributor 14 is actuated, the oil coming from P will cause the rod of the jack VI to enter the speed VT, the distributors 16-17-18 all being electrically actuated. By cutting the power of 16 we will get a 2nd speed equal to VT / X, then by cutting the power of 17 we will get a third speed VT / Y and, by cutting the power on 18 we will get the movement stopped with great precision, the shocks having been eliminated elsewhere.

Bien entendu, l'invention ne se limite pas à l'exemple de réalisation représenté mais en englobe au contraire toutes les variantes constructives.  Of course, the invention is not limited to the embodiment shown but on the contrary encompasses all the constructive variants.

Claims (7)

REVENDICATIONS 1. Distributeur hydraulique pour fluides dits "incompressibles" caractérisé en ce que l'organe moteur est constitué d'un piston principal 1 en céramique piézoélectrique, monobloc ou composite, en ce que'l'étanchéité est assurée par une bille 8 faisant office de clapet. 1. Hydraulic distributor for so-called "incompressible" fluids characterized in that the drive member consists of a main piston 1 made of piezoelectric ceramic, in one piece or composite, in that the sealing is ensured by a ball 8 acting as a valve. 2. Distributeur hydraulique selon la revendication 1 caractérisé par le fait que la bille-clapet 8 est manoeuvrée par l'intermédiaire d'un piston secondaire 6 en prenant appui sur l'isolant électrique 10 du piston moteur 1. 2. Hydraulic distributor according to claim 1 characterized in that the ball valve 8 is operated by means of a secondary piston 6 by bearing on the electrical insulator 10 of the driving piston 1. 3. Distributeur hydraulique selon les revendications 1 et 2 caractérisé par le fait que le piston moteur 1 peut être remplacé facilement grâce au bouchon 5a. 3. Hydraulic distributor according to claims 1 and 2 characterized in that the driving piston 1 can be replaced easily by means of the plug 5a. 4. Distributeur hydraulique selon les revendications 1 et 2 caractérisé par le fait que le bloc 5-1 comportant la bille 8 est interchangeable afin de calibrer la section d'écoulement correspondant à chaque application. 4. Hydraulic distributor according to claims 1 and 2 characterized in that the block 5-1 comprising the ball 8 is interchangeable in order to calibrate the flow section corresponding to each application. 5. Distributeur hydraulique selon les revendications 1-2-3-4 caractérisé par le fait que l'écoulement du fluide est bloqué par manque de courant et est assuré sous courant. 5. Hydraulic distributor according to claims 1-2-3-4 characterized in that the flow of the fluid is blocked by lack of current and is ensured under current. 6. Distributeur hydraulique selon les revendications 1-2 et 4 caractérisé par le fait que la bille 8 et le piston 6 peuvent être remDlacés par une seule pièce 8-1 formant clapet. 6. Hydraulic distributor according to claims 1-2 and 4 characterized in that the ball 8 and the piston 6 can be replaced by a single piece 8-1 forming a valve. 7. Distributeur hydraulique selon les revendications 1 à 6 caractérisé par le fait qu'il est utilisé pour des fluides dits "compressibles".  7. Hydraulic distributor according to claims 1 to 6 characterized in that it is used for so-called "compressible" fluids.
FR8100849A 1981-01-19 1981-01-19 Hydraulic distributor e.g. for hydraulic jack - has piezoelectrical piston acting on valve ball to stop liq. flowing Granted FR2498285A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8100849A FR2498285A1 (en) 1981-01-19 1981-01-19 Hydraulic distributor e.g. for hydraulic jack - has piezoelectrical piston acting on valve ball to stop liq. flowing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8100849A FR2498285A1 (en) 1981-01-19 1981-01-19 Hydraulic distributor e.g. for hydraulic jack - has piezoelectrical piston acting on valve ball to stop liq. flowing

Publications (2)

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FR2498285A1 true FR2498285A1 (en) 1982-07-23
FR2498285B3 FR2498285B3 (en) 1983-10-28

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0118344A1 (en) * 1983-02-14 1984-09-12 Mecilec S.A. Digital powerdrive
DE3630911A1 (en) * 1985-10-03 1987-04-16 Mitsubishi Electric Corp ELECTROMAGNETIC PROPORTIONAL CONTROL VALVE
WO1991008410A1 (en) * 1989-12-05 1991-06-13 Mikhail Evgenievich Markushin Valve for releasing the pressure of working medium
FR2743129A1 (en) * 1995-12-29 1997-07-04 Renault Non-return valve with low-inertia piezo-electric actuator
US5720417A (en) * 1994-04-02 1998-02-24 Itw Dynatec Gmbh Klebetechnik Applicator head for dosed dispensation of fluid mediums

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0118344A1 (en) * 1983-02-14 1984-09-12 Mecilec S.A. Digital powerdrive
DE3630911A1 (en) * 1985-10-03 1987-04-16 Mitsubishi Electric Corp ELECTROMAGNETIC PROPORTIONAL CONTROL VALVE
US4714089A (en) * 1985-10-03 1987-12-22 Mitsubishi Denki Kabushiki Kaisha Electromagnetic proportional control valve
WO1991008410A1 (en) * 1989-12-05 1991-06-13 Mikhail Evgenievich Markushin Valve for releasing the pressure of working medium
US5720417A (en) * 1994-04-02 1998-02-24 Itw Dynatec Gmbh Klebetechnik Applicator head for dosed dispensation of fluid mediums
FR2743129A1 (en) * 1995-12-29 1997-07-04 Renault Non-return valve with low-inertia piezo-electric actuator

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Publication number Publication date
FR2498285B3 (en) 1983-10-28

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