FR2685395A1 - Hydraulic circuit for the transmission of displacements including means for compensating for the expansion of the liquid - Google Patents

Hydraulic circuit for the transmission of displacements including means for compensating for the expansion of the liquid Download PDF

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Publication number
FR2685395A1
FR2685395A1 FR9115739A FR9115739A FR2685395A1 FR 2685395 A1 FR2685395 A1 FR 2685395A1 FR 9115739 A FR9115739 A FR 9115739A FR 9115739 A FR9115739 A FR 9115739A FR 2685395 A1 FR2685395 A1 FR 2685395A1
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France
Prior art keywords
circuit
liquid
piston
transmission
variation
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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.)
Granted
Application number
FR9115739A
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French (fr)
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FR2685395B1 (en
Inventor
Pajot Jean Claude
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.)
Automobiles Peugeot SA
Automobiles Citroen SA
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Automobiles Peugeot SA
Automobiles Citroen SA
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Application filed by Automobiles Peugeot SA, Automobiles Citroen SA filed Critical Automobiles Peugeot SA
Priority to FR9115739A priority Critical patent/FR2685395A1/en
Publication of FR2685395A1 publication Critical patent/FR2685395A1/en
Application granted granted Critical
Publication of FR2685395B1 publication Critical patent/FR2685395B1/fr
Granted 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/045—Compensating for variations in viscosity or temperature
    • 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
    • F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
    • F15B7/06—Details
    • F15B7/10—Compensation of the liquid content in a system

Abstract

The invention proposes an arrangement (10) for the transmission to a receiving member (12) of the displacements of an emitter member (14), of the type including a closed hydraulic circuit which connects a hydraulic emitter (20) and a hydraulic receiver (34), and means (46) for causing the internal volume of the circuit to vary as a function of the variation of temperature of the liquid contained in the circuit, characterised in that these means (46) include a variable-volume chamber (80) of a cylinder (48) mounted as a branch-off on the circuit and which is delimited by a sliding piston (50) of which the face (66) subjected to the action of the transmission liquid is urged elastically to bear against an expandable capsule (70) the axial length of which varies as a function of the variation in the temperature of the transmission liquid.

Description

La présente invention concerne un agencement pour la transmission à un organe récepteur des déplacements d'un organe émetteur, du type comportant un circuit hydraulique fermé qui relie un émetteur hydraulique et un récepteur hydraulique. The present invention relates to an arrangement for transmitting to a receiving member the movements of a transmitting member, of the type comprising a closed hydraulic circuit which connects a hydraulic transmitter and a hydraulic receiver.

Pour de très nombreuses applications, il est nécessaire qu'un tel agencement pour la transmission hydraulique en circuit étanche d'un déplacement fonctionne de manière fiable et reproductible quelle que soit la température du liquide contenu dans le circuit et à une pression sensiblement constante. For very many applications, it is necessary that such an arrangement for the hydraulic transmission in a sealed circuit of a displacement functions in a reliable and reproducible manner whatever the temperature of the liquid contained in the circuit and at a substantially constant pressure.

I1 est donc nécessaire de prévoir des moyens pour faire varier le volume interne du circuit en fonction de la variation de température du liquide de transmission contenu dans le circuit afin de compenser les dilatations du liquide et d'éviter ainsi une variation de la pression interne et/ou du déplacement du récepteur en cas d'échauffement ou de refroidissement de manière à garantir une fidélité de la transmission, et notamment dans le cas de la transmission de déplacements de faibles valeurs. It is therefore necessary to provide means for varying the internal volume of the circuit as a function of the variation in temperature of the transmission liquid contained in the circuit in order to compensate for the expansion of the liquid and thus to avoid a variation in the internal pressure and / or the displacement of the receiver in the event of heating or cooling so as to guarantee fidelity of the transmission, and in particular in the case of the transmission of displacements of low values.

Dans ce but, l'invention propose un agencement du type mentionné précédemment, caractérisé en ce que les moyens pour faire varier le volume interne du circuit comportent une chambre étanche à volume variable d'un cylindre monté en dérivation sur le circuit et qui est délimitée par un piston coulissant dont la face soumise à l'action du liquide de transmission est sollicitée élastiquement en appui contre un organe de butée dont la position axiale varie en fonction de la variation de la température du liquide de transmission. To this end, the invention provides an arrangement of the type mentioned above, characterized in that the means for varying the internal volume of the circuit comprise a sealed chamber with variable volume of a cylinder mounted as a bypass on the circuit and which is delimited by a sliding piston whose face subjected to the action of the transmission liquid is elastically urged to bear against a stop member whose axial position varies as a function of the variation in the temperature of the transmission liquid.

Selon d'autres caractéristiques de l'invention
- la face du piston soumise à l'action du liquide de transmission prend appui contre une extrémité d'un organe de butée dont la longueur varie en fonction de la variation de la température du liquide de transmission qui l'entoure et dont l'autre extrémité est fixée sur une cloison radiale percée du cylindre
- l'organe de butée est une capsule dilatable
- le circuit hydraulique est un circuit sous pression à pression nominale constante, et l'effort élastique qui sollicite le piston en appui contre l'organe de butée est supérieur à la poussée exercée sur le piston par le liquide sous pression.According to other features of the invention
- the face of the piston subjected to the action of the transmission liquid bears against one end of a stop member whose length varies as a function of the variation in the temperature of the transmission liquid which surrounds it and the other of which end is fixed on a radial partition pierced by the cylinder
- the stop member is an expandable capsule
- The hydraulic circuit is a pressure circuit at constant nominal pressure, and the elastic force which biases the piston in abutment against the stop member is greater than the thrust exerted on the piston by the pressurized liquid.

D'autres caractéristiques et avantages de l'invention apparaîtront de la lecture détaillée qui va suivre pour la compréhension de laquelle on se reportera aux dessins annexés dans lesquels
- La figure 1 est une vue en coupe partielle d'un agencement réalisé conformément aux enseignements de l'invention ; et
- la figure 2 est une vue simplifiée similaire à celle de la figure 1 illustrant une variante de réalisation.Other characteristics and advantages of the invention will emerge from the detailed reading which follows for the understanding of which reference will be made to the appended drawings in which
- Figure 1 is a partial sectional view of an arrangement produced in accordance with the teachings of the invention; and
- Figure 2 is a simplified view similar to that of Figure 1 illustrating an alternative embodiment.

L'agencement 10 illustré à la figure 1 a pour fonction de transmettre hydrauliquement à un organe récepteur 12 les déplacements linéaires d'un organe émetteur 14 qui est par exemple un poussoir commandé par une came tournante 16. The arrangement 10 illustrated in FIG. 1 has the function of hydraulically transmitting to a receiving member 12 the linear displacements of a sending member 14 which is for example a pusher controlled by a rotating cam 16.

Le poussoir 14 agit sur le piston 18 d'un émetteur hydraulique 20. The pusher 14 acts on the piston 18 of a hydraulic transmitter 20.

En effet, le piston 18 est monté de manière étanche dans un cylindre émetteur 22 et il est sollicité élastiquement par un ressort de rappel 24 en appui contre le poussoir 14, le ressort 24 prenant lui-même appui contre une plaque d'appui 26 percée en son centre. Indeed, the piston 18 is mounted in leaktight manner in an emitting cylinder 22 and it is resiliently biased by a return spring 24 bearing against the pusher 14, the spring 24 itself bearing against a pierced support plate 26 in its center.

Le corps 28 du cylindre de l'émetteur hydraulique 20 se prolonge par un boîtier 30 qui est raccordé par une canalisation 32 à un cylindre récepteur hydraulique 34.  The body 28 of the cylinder of the hydraulic transmitter 20 is extended by a housing 30 which is connected by a pipe 32 to a hydraulic receiver cylinder 34.

Le corps 36 du cylindre récepteur reçoit un piston récepteur 38 qui y est monté coulissant de manière étanche et qui est sollicité en appui axial contre un épaulement interne de butée 40 par un ressort de rappel élastique 42 qui prend appui contre le fond d'un bouchon de fermeture 44 traversé par organe émetteur 12 qui prolonge le piston 38. The body 36 of the receiving cylinder receives a receiving piston 38 which is slidably mounted therein and which is urged to bear axially against an internal abutment shoulder 40 by an elastic return spring 42 which bears against the bottom of a plug. closure 44 through which the emitting member 12 passes which extends the piston 38.

Les éléments qui viennent d'être décrits constituent donc un agencement pour la transmission hydraulique des déplacements de l'organe émetteur 14 à l'organe récepteur 12 au moyen d'un circuit hydraulique étanche dans lequel est enfermé un liquide sous une pression nominale et qui relie les chambres de travail ou de pression 21 de l'émetteur hydraulique 20 et 35 du récepteur hydraulique 34. The elements which have just been described therefore constitute an arrangement for the hydraulic transmission of the movements of the transmitting member 14 to the receiving member 12 by means of a sealed hydraulic circuit in which a liquid is enclosed under a nominal pressure and which connects the working or pressure chambers 21 of the hydraulic transmitter 20 and 35 of the hydraulic receiver 34.

Conformément à l'invention, et afin de compenser la dilatation thermique du liquide contenu dans le circuit lorsque sa température varie, il est prévu des moyens 46. In accordance with the invention, and in order to compensate for the thermal expansion of the liquid contained in the circuit when its temperature varies, means 46 are provided.

Les moyens 46 comportent un cylindre 48 monté en dérivation sur le circuit et qui, dans le mode de réalisation illustré sur les figures, est intégré au boîtier 30 qui prolonge le corps 28 de l'émetteur hydraulique 20. The means 46 comprise a cylinder 48 mounted as a bypass on the circuit and which, in the embodiment illustrated in the figures, is integrated into the housing 30 which extends the body 28 of the hydraulic transmitter 20.

Un piston 50 de compensation est monté coulissant de manière étanche dans la portion d'alésage 52 du cylindre 48. A compensation piston 50 is mounted to slide in leaktight manner in the bore portion 52 of the cylinder 48.

La face arrière 54 du piston 50 est soumise à l'action de rappel élastique d'un ressort hélicoïdal de compression 56 qui prend appui sur la face 54 et sur le fond 58 du cylindre 48. The rear face 54 of the piston 50 is subjected to the elastic return action of a helical compression spring 56 which bears on the face 54 and on the bottom 58 of the cylinder 48.

Le ressort 56 est monté dans l'alésage de plus grand diamètre 60 du cylindre 48 dont la partie arrière est constituée par un capuchon vissé 62 percé en son centre d'un trou 64 de mise à l'air libre.  The spring 56 is mounted in the larger diameter bore 60 of the cylinder 48, the rear part of which is constituted by a screwed cap 62 pierced in its center with a hole 64 for venting.

La face avant 66 du piston de compensation 50 prend appui axialement contre l'extrémité 68 d'une capsule dilatable 70. The front face 66 of the compensation piston 50 bears axially against the end 68 of an expandable capsule 70.

Le corps 72 de la capsule dilatable est fixé dans une cloison radiale 74 du cylindre 48 qui comporte des trous 76 permettant le passage du liquide de transmission hydraulique qui entoure donc ainsi le corps de la capsule dilatable 70 de part et d'autre de la cloison 74 et qui agit sur la face 66 du piston 50. The body 72 of the expandable capsule is fixed in a radial partition 74 of the cylinder 48 which has holes 76 allowing the passage of the hydraulic transmission fluid which therefore thus surrounds the body of the expandable capsule 70 on either side of the partition 74 and which acts on the face 66 of the piston 50.

Le circuit hydraulique est un circuit sous pression dans lequel le liquide est soumis à une pression variant autour d'une pression nominale constante, lors de ses déplacements en va-et-vient à fréquence variable, accompagnant ceux des organes émetteur 14 et récepteur 12. The hydraulic circuit is a pressurized circuit in which the liquid is subjected to a pressure varying around a constant nominal pressure, during its movements back and forth at variable frequency, accompanying those of the transmitter 14 and receiver 12 organs.

Le ressort 56 est agencé pour exercer sur le piston 50 un effort toujours supérieur à la poussée exercée par le liquide sous pression sur la face 66, de sorte que le piston est maintenu en appui sur l'extrémité 68 de la capsule 70. The spring 56 is arranged to exert on the piston 50 a force always greater than the thrust exerted by the liquid under pressure on the face 66, so that the piston is kept in abutment on the end 68 of the capsule 70.

L'agencement qui vient d'être mentionné fonctionne de la manière suivante. The arrangement which has just been mentioned works in the following manner.

Tant que la température du liquide de transmission contenu dans le circuit hydraulique reste constante, les moyens 46 n'ont aucun effet sur le fonctionnement de l'agencement. As long as the temperature of the transmission liquid contained in the hydraulic circuit remains constant, the means 46 have no effect on the operation of the arrangement.

Les déplacements du poussoir 14 sont transmis hydrauliquement, d'une manière classique, à l'organe récepteur 12. The displacements of the pusher 14 are transmitted hydraulically, in a conventional manner, to the receiving member 12.

Lorsque la température varie, le volume du liquide contenu dans le circuit varie ; en même temps, la longueur de l'extrémité en saillie 68 de la capsule dilatable 70 varie et provoque un déplacement correspondant du piston 50 qui a pour conséquence de faire varier le volume de la chambre 80 délimitée par la face 66 du piston et par la paroi cylindrique 74, et donc de faire varier le volume total du circuit hydraulique. Les caractéristiques de dilatation de la capsule 70 sont telles que le volume de liquide déplacé par le piston 50 soit sensiblement égal à la variation de volume, par dilatation, du liquide contenu dans le circuit. La variation de température n'a donc ainsi aucun effet sur la transmission des déplacements entre les organes 14 et 12. When the temperature varies, the volume of the liquid contained in the circuit varies; at the same time, the length of the projecting end 68 of the expandable capsule 70 varies and causes a corresponding displacement of the piston 50 which has the effect of varying the volume of the chamber 80 delimited by the face 66 of the piston and by the cylindrical wall 74, and therefore to vary the total volume of the hydraulic circuit. The expansion characteristics of the capsule 70 are such that the volume of liquid displaced by the piston 50 is substantially equal to the variation in volume, by expansion, of the liquid contained in the circuit. The temperature variation therefore has no effect on the transmission of the displacements between the members 14 and 12.

L'agencement qui vient d'être décrit a pour avantage d'être indépendant de la pression interne nominale du liquide de transmission et d'être indépendant de cette pression pour compenser les variations de volume, ce qui n'est pas le cas lorsque l'on utilise des systèmes à clapets de décharge dans le cas des circuits ouverts, ou un agencement à volume compressible qui ne permet pas une transmission positive de l'émetteur au récepteur car toute compression sans échauffement du liquide de ce volume compressible a pour inconvénient de se traduire par une perte de course du récepteur. The arrangement which has just been described has the advantage of being independent of the nominal internal pressure of the transmission fluid and of being independent of this pressure to compensate for variations in volume, which is not the case when the '' relief valve systems are used in the case of open circuits, or an arrangement with compressible volume which does not allow a positive transmission from the transmitter to the receiver because any compression without heating of the liquid of this compressible volume has the disadvantage of result in loss of receiver travel.

Dans la variante de réalisation illustrée à la figure 2, les ressorts de rappel élastique 24 et 42 des émetteur et récepteur hydrauliques 20 et 34 ont avantageusement été remplacés par des blocs en matériau élastique 82 et 84 qui assurent en même temps la fonction des pistons 18 et 38.  In the variant embodiment illustrated in FIG. 2, the elastic return springs 24 and 42 of the hydraulic transmitter and receiver 20 and 34 have advantageously been replaced by blocks of elastic material 82 and 84 which at the same time ensure the function of the pistons 18 and 38.

Claims (5)

REVENDICATIONS 1. Agencement (10) pour la transmission à un organe récepteur (12) des déplacements d'un organe émetteur (14), du type comportant un circuit hydraulique fermé qui relie un émetteur hydraulique (20) et un récepteur hydraulique (34), et des moyens (46) pour faire varier le volume interne du circuit en fonction de la variation de température du liquide contenu dans le circuit, caractérisé en ce que lesdits moyens (46) comportent une chambre (80) à volume variable d'un cylindre (48) monté en dérivation sur le circuit et qui est délimitée par un piston coulissant (50) dont la face (66) soumise à l'action du liquide de transmission est sollicitée élastiquement en appui contre un organe de butée (70) dont la position axiale varie en fonction de la variation de la température du liquide de transmission. 1. Arrangement (10) for the transmission to a receiving member (12) of the movements of a transmitting member (14), of the type comprising a closed hydraulic circuit which connects a hydraulic transmitter (20) and a hydraulic receiver (34), and means (46) for varying the internal volume of the circuit as a function of the temperature variation of the liquid contained in the circuit, characterized in that said means (46) comprise a chamber (80) with variable volume of a cylinder (48) mounted as a bypass on the circuit and which is delimited by a sliding piston (50) the face (66) of which is subjected to the action of the transmission liquid is elastically biased in abutment against a stop member (70) whose axial position varies according to the variation of the temperature of the transmission fluid. 2. Agencement selon la revendication 1, caractérisé en ce que ladite face (66) du piston prend appui contre une extrémité (68) d'un organe de butée (70) dont la longueur varie en fonction de la variation de la température du liquide de transmission qui l'entoure et dont l'autre extrémité est fixée sur une cloison radiale percée (74) du cylindre (48). 2. Arrangement according to claim 1, characterized in that said face (66) of the piston bears against one end (68) of a stop member (70) whose length varies as a function of the variation in the temperature of the liquid transmission which surrounds it and the other end of which is fixed to a drilled radial partition (74) of the cylinder (48). 3. Agencement selon la revendication 2, caractérisé en ce que l'organe de butée est une capsule dilatable (70). 3. Arrangement according to claim 2, characterized in that the stop member is an expandable capsule (70). 4. Agencement selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le circuit hydraulique est un circuit sous pression à pression nominale constante, et en ce l'ef fort élastique qui sollicite le piston (50) en appui contre l'organe de butée (70) est supérieur à la poussée exercée sur le piston par le liquide sous pression. 4. Arrangement according to any one of claims 1 to 3, characterized in that the hydraulic circuit is a pressure circuit at constant nominal pressure, and in this highly elastic ef which biases the piston (50) in abutment against the the stop member (70) is greater than the thrust exerted on the piston by the pressurized liquid. 5. Agencement selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la variation de position axiale de l'organe de butée (70) et du piston (50) en fonction de la variation de température est telle que le volume de liquide déplacé par le piston est sensiblement égal à la variation de volume, par dilatation, du liquide contenu dans le circuit.  5. Arrangement according to any one of claims 1 to 4, characterized in that the variation in axial position of the stop member (70) and of the piston (50) as a function of the variation in temperature is such that the volume of liquid displaced by the piston is substantially equal to the change in volume, by expansion, of the liquid contained in the circuit.
FR9115739A 1991-12-18 1991-12-18 Hydraulic circuit for the transmission of displacements including means for compensating for the expansion of the liquid Granted FR2685395A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9115739A FR2685395A1 (en) 1991-12-18 1991-12-18 Hydraulic circuit for the transmission of displacements including means for compensating for the expansion of the liquid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9115739A FR2685395A1 (en) 1991-12-18 1991-12-18 Hydraulic circuit for the transmission of displacements including means for compensating for the expansion of the liquid

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FR2685395A1 true FR2685395A1 (en) 1993-06-25
FR2685395B1 FR2685395B1 (en) 1995-06-02

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR680342A (en) * 1929-08-14 1930-04-28 Automatic expansion compensator
GB414794A (en) * 1933-02-23 1934-08-16 George Rudolph Volkert Improvements in or relating to hydraulic control apparatus
DE709037C (en) * 1939-05-24 1941-08-04 Telefunken Gmbh Process for the production of thermal expansion compensation in hydraulic telecommunication and control lines o.
DE1930190A1 (en) * 1968-06-14 1969-12-18 Cibie Angers Device for balancing temperature-related volume fluctuations in a hydraulic transmission system
FR2232693A1 (en) * 1973-06-07 1975-01-03 Ducellier & Cie
US4716863A (en) * 1985-11-15 1988-01-05 Pruzan Daniel A Internal combustion engine valve actuation system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR680342A (en) * 1929-08-14 1930-04-28 Automatic expansion compensator
GB414794A (en) * 1933-02-23 1934-08-16 George Rudolph Volkert Improvements in or relating to hydraulic control apparatus
DE709037C (en) * 1939-05-24 1941-08-04 Telefunken Gmbh Process for the production of thermal expansion compensation in hydraulic telecommunication and control lines o.
DE1930190A1 (en) * 1968-06-14 1969-12-18 Cibie Angers Device for balancing temperature-related volume fluctuations in a hydraulic transmission system
FR2232693A1 (en) * 1973-06-07 1975-01-03 Ducellier & Cie
US4716863A (en) * 1985-11-15 1988-01-05 Pruzan Daniel A Internal combustion engine valve actuation system

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