FR2574893A1 - Controlled oil valve - Google Patents

Controlled oil valve Download PDF

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Publication number
FR2574893A1
FR2574893A1 FR8419317A FR8419317A FR2574893A1 FR 2574893 A1 FR2574893 A1 FR 2574893A1 FR 8419317 A FR8419317 A FR 8419317A FR 8419317 A FR8419317 A FR 8419317A FR 2574893 A1 FR2574893 A1 FR 2574893A1
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FR
France
Prior art keywords
chamber
main
core
outlet orifice
electromagnet
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.)
Pending
Application number
FR8419317A
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French (fr)
Inventor
Maurice De Raco
Pierre Rey
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.)
BorgWarner Transmission Systems Monaco SAM
Original Assignee
Eaton SAM
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 Eaton SAM filed Critical Eaton SAM
Priority to FR8419317A priority Critical patent/FR2574893A1/en
Publication of FR2574893A1 publication Critical patent/FR2574893A1/en
Pending legal-status Critical Current

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Classifications

    • 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
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
    • F16K31/40—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor
    • F16K31/406—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor acting on a piston

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

Controlled hydraulic solenoid valve, intended especially for controlling vehicle gear boxes, characterised in that it is composed of a cylindrical body 1 in which there are made, on the one hand, an axial control chamber 2 in which there is housed the core 7 of an electromagnet surrounded by its shell and its winding normally plugging the lower outlet orifice of this chamber, and a main chamber 3 transverse to the previous one, in which there is housed the main core 13, normally pushed back under its seat by a spring thus plugging the outlet orifice of this chamber and having, relative to the rear of the said chamber, an annular clearance allowing the passage, towards its rear face, of the hydraulic fluid, the said chambers permanently being in communication via a passage orifice 4 of cross-section greater than the aforementioned annular clearance, so that, by excitation of the electromagnet, the control core uncovers the outlet orifice of the control chamber, bringing about flow of the fluid along a path passing through the rear of the main core, and thus creating in the main chamber a partial vacuum determining the backwards movement of the main core, the opening of the outlet orifice of the main chamber, and consequently, the supply of fluid to the control system of the gear box, stopping the excitation of the electromagnet bringing the elements back into their normal position in which the main outlet orifice and control outlet orifice are both closed.

Description

La présente invention concerne une nouvelle vanne à huite du type dit "pilotee", ne présentant qu'un tries faible encombrement, et permettant cependant un fonctionnement sous haute pression. Une telle vanne trouve son application notamment dans les boîtes de vitesses automatiques pour véhicules. The present invention relates to a new type 8 pilot valve "piloted", having only a small size sorting, and yet allowing operation under high pressure. Such a valve finds its application in particular in automatic gearboxes for vehicles.

On sait que pour la commande hydraulique des boîtes de vitesse automatiques, la commande des distributeurs de pression est asservie par une électrovanne. It is known that for the hydraulic control of automatic gearboxes, the control of the pressure distributors is controlled by a solenoid valve.

A cet effet, différents types d'electrovannes sont utilisés, selon la conception du schéma hydraulique
- normalement ouverte
- normalement fermée
- 2 voies + purge.For this purpose, different types of solenoid valves are used, depending on the design of the hydraulic diagram.
- normally open
- normally closed
- 2 ways + purge.

La présente invention se classe dans la catégorie des dispositifs à vanne normalement fermée. The present invention falls into the category of normally closed valve devices.

Dans cette catégorie de dispositifs, les systèmes actuellement connus sont du type à action directe, car ce mode d'action est le seul que permet l'encombrement imposé, ce qui a pour conséquence que leur usage est interdit dès que les pressions à commander dépassent 10 Bars. In this category of devices, the systems currently known are of the direct action type, because this mode of action is the only one that allows the imposed space requirement, which has the consequence that their use is prohibited as soon as the pressures to be controlled exceed 10 Bars.

Pour des pressions plus élevées, de l'ordre de 15 à 30 bars, il faudrait néeessairement utiliser une vanne pilotée. For higher pressures, of the order of 15 to 30 bars, it would be necessary to use a pilot operated valve.

Par contre la technologie actuellement existante pour ces dispositifs conduit à un encombrement qui en exclut leur emploi pour cette fonction.On the other hand, the technology currently existing for these devices leads to a bulk which excludes their use for this function.

L'invention permet d'éliminer cette difficulté grâce à une électrovanne hydraulique pilotée pouvant être montée dans un alésage d'environ 20 mm de diamètre seulement. The invention eliminates this difficulty thanks to a piloted hydraulic solenoid valve which can be mounted in a bore of only about 20 mm in diameter.

A cet effet, la vanne selon l'invention se compose d'un corps cylindrique dans lequel sont pratiquées une chambre de pilotage axiale dans laquelle est logé le noyau d'un électroaimant, obturant normalement l'orifice de sortie de cette chambre, et une chambre principale transversale à la précédente, et dans laquelle est logé le noyau principal, normalement repoussé sur son siège par un ressort en obturant ainsi l'orifice de sortie de cette chambre, et présentant par rapport à l'arrière de ladite chambre, un jeu annulaire autorisant le passage, vers sa face arrière, du fluide hydraulique, lesdites chambres étant en permanence en communication, par un orifice de passage de section supérieure à celle dudit jeu annulaire, de manière telle que, par excitation de l'électroaimant, le noyau de pilotage découvre l'orifice de sortie de la chambre de pilotage, provoquant l'écoulement du fluide suivant un trajet passant par l'arrière du noyau principal et créant donc dans la chambre principale une dépression determinant le recul du noyau principal et l'ouverture de l'orifice de sortie de la chambre principale et par suite l'alimentation en fluide du système de commande de la boite de vitesse. To this end, the valve according to the invention consists of a cylindrical body in which are formed an axial piloting chamber in which is housed the core of an electromagnet, normally closing the outlet orifice of this chamber, and a main chamber transverse to the previous one, and in which the main core is housed, normally pushed back onto its seat by a spring, thereby closing the outlet orifice of this chamber, and having, with respect to the rear of said chamber, a clearance annular allowing the passage, towards its rear face, of the hydraulic fluid, the said chambers being permanently in communication, by a passage orifice of cross section greater than that of the said annular clearance, in such a way that, by excitation of the electromagnet, the core pilot discovers the outlet of the pilot chamber, causing the fluid to flow along a path passing through the rear of the main core and therefore creating in the main chamber a depression determining the recoil of the main core and the opening of the outlet port of the main chamber and consequently the supply of fluid to the gearbox control system.

On comprendra mieux l'invention en se référant à la description suivante correspondant aux dessins annexés sur lesquels
- la figure 1 est une coupe verticale passant par le plan commun aux deux chambres, et
- les figures 2 à 4 sont des coupes horizontales par les plans II-II, III-III et IV-IV de la figure 1.The invention will be better understood by referring to the following description corresponding to the attached drawings in which
FIG. 1 is a vertical section passing through the plane common to the two chambers, and
- Figures 2 to 4 are horizontal sections through planes II-II, III-III and IV-IV of Figure 1.

Sur ce dessin on a représenté le dispositif selon l'invention, qui se compose- d'un corps cylindrique 1, dans lequel sont pratiquées deux chambres, une chambre dite de pilotage 2, coaxiale au corps, et une chambre principale 3 transversale par rapport à la chambre 1 et communiquant avec elle par un orifice 4. This drawing shows the device according to the invention, which consists of a cylindrical body 1, in which two chambers are made, a so-called pilot chamber 2, coaxial with the body, and a main chamber 3 transverse to to chamber 1 and communicating with it through an orifice 4.

Dans la chambre 1 sont logées une carcasse 5 contenant un bobinage 6 susceptible d'être alimenté en courant électrique par des moyens de commande (non représentés). Dans l'entrefer subsistant au centre de la carcasse 5, est logé un plongeur 7 constituant le noyau mobile de pilotage. In chamber 1 are housed a carcass 5 containing a coil 6 capable of being supplied with electric current by control means (not shown). In the air gap remaining at the center of the carcass 5, is housed a plunger 7 constituting the mobile piloting core.

Une pièce polaire 8 est disposée dans une rainure à la base de la carcasse 5, laquelle présente dans sa partie centrale une sortie 9, normalement obturée par la base 10 du noyau 7, c'est-à-dire que dans le courant électrique n'est pas envoyé dans le bobinage 6, l'orifice 9 est obturé. A pole piece 8 is disposed in a groove at the base of the carcass 5, which has in its central part an outlet 9, normally closed by the base 10 of the core 7, that is to say that in the electric current n is not sent to the winding 6, the orifice 9 is closed.

La chambre principale 3 se termine à sa partie antérieure par un rétrécissement 11 dont la section serait désignée par
Cette chambre 3 stouvre dans le couvercle du corps 1 par un orifice d'admission de fluide 12.The main chamber 3 ends at its front part by a narrowing 11 whose section would be designated by
This chamber 3 opens in the cover of the body 1 through a fluid intake orifice 12.

Dans la chambre 3 se déplace un noyau principal 13 dont la partie antérieure est formée d'un joint cônique 14 venant s'appli- quer contre le rétrécissement 11 de sortie de la chambre 3. In the chamber 3 a main core 13 moves, the front part of which is formed by a conical joint 14 which comes to bear against the narrowing 11 at the outlet of the chamber 3.

A l'arrière la chambre 3 est fermée par un bouchon 15 prenant appui sur des épaulements 16 de la chambre. At the rear, the chamber 3 is closed by a plug 15 bearing on the shoulders 16 of the chamber.

Le noyau principal 13 est repoussé normalement contre la sortie définie par le rétrécissement -11 au moyen d'un ressort 17. The main core 13 is pushed normally against the outlet defined by the narrowing -11 by means of a spring 17.

Il est important de noter que le noyau mobile principal 13 présenl un jeu dans la chambre 3,sa section S2 étant légèrement inférieurs à la section de la chambre 3,de sorte que le fluide pénétrant par l'orifice d'admission 12 peut stécouler normalement par derrière le noyau 13 de manière à pénétrer dans la chambre de pilotage 2.It is important to note that the main movable core 13 presents a clearance in the chamber 3, its section S2 being slightly less than the section of the chamber 3, so that the fluid entering through the inlet orifice 12 can stew down normally. from behind the core 13 so as to enter the control chamber 2.

Le fonctionnement du système est alors le suivant
Le fluide arrivant dans l'orifice d'admission 12 sous une pression P0 ne peut passer par l'orifice de sortie défini par le rétrécissement 11 de la chambre 3 et passe derrière le noyau 13 en le plaquant contre son siège 11, et en même temps traverse l'orifice 4 pour aller à la chambre 2, qui est obturée par le noyau reposant par son embout 10 sur l'orifice 9.The operation of the system is then as follows
The fluid arriving in the inlet orifice 12 under a pressure P0 cannot pass through the outlet orifice defined by the narrowing 11 of the chamber 3 and passes behind the core 13 by pressing it against its seat 11, and at the same time time passes through the orifice 4 to go to the chamber 2, which is closed by the core resting by its end piece 10 on the orifice 9.

Il n'y a donc pas de circulation du fluide arrivant par 12. There is therefore no circulation of the fluid arriving via 12.

Quand l'électroaimant est excité par une impulsion électrique, résultant de la commande de la boîte devitesse, le noyau 7 est soulevé, en débouchant ainsi l'orifice 9 par lequel peut s'écouler le fluide. Il se crée alors une dépression entre la face postérieure du noyau principal 13 qui vient donc se plaquer contre le bouchon 15, en opposition au ressort 17, de sorte que l'huile peut passer par l'espace dégage entre le joint 13 et le rétrécissement 11 et aller ensuite par des cannelures verticales 18, réparties sur le pourtour de la face externe du corps 1, pour aller dans le fond de la boîte de vitesse. When the electromagnet is excited by an electrical impulse, resulting from the control of the gearbox, the core 7 is lifted, thereby opening the orifice 9 through which the fluid can flow. A depression is then created between the rear face of the main core 13 which therefore comes to be pressed against the plug 15, in opposition to the spring 17, so that the oil can pass through the space released between the seal 13 and the narrowing 11 and then go through vertical grooves 18, distributed around the periphery of the external face of the body 1, to go into the bottom of the gearbox.

Des que l'électroaimant n'est plus alimenté, le noyau de pilotage 7 est de nouveau repoussé par l'huile sous pression contre son siège 9, en bloquant ainsi le débit de pilotage. La pression se rééquilibre à l'arrière du noyau principal 13 et celui-ci est donc repoussé contre son siège 11 en arrêtant également le débit principal. As soon as the electromagnet is no longer supplied, the piloting core 7 is again pushed back by the oil under pressure against its seat 9, thereby blocking the piloting flow. The pressure rebalances at the rear of the main core 13 and the latter is therefore pushed back against its seat 11 while also stopping the main flow.

Les déplacements d'avant en arrière et inversement, du noyau principal 13, sont donc assurés par le déséquilibre de pression provoque par l'ouverture de l'orifice de pilotage et les différentes sections de passage du fluide. En d'autre termes, des lors que la section du trou pilotage 4 est supérieure à la section annulaire du passage entre le noyau principal et le corps, le fonctionnement est assuré.Si l'on appelle P1 la pression règnant entre le bouchon 15 et le noyau principal 13, on peut analyser de la manière suivante les différentes phases du fonctionnement qui viennent d'être exposées, en désignant par F la force avec laquelle le noyau principal est sollicité d'un côté ou de l'autre de la chambre 3
Repos : électrovanne fermée PO = P1
F = P1 S2 - Po(S2 - S1) = P1 S1 qui est la force résultante qui plaque le noyau principal sur son siège.Movements from front to back and vice versa, of the main core 13, are therefore ensured by the pressure imbalance caused by the opening of the pilot orifice and the various sections for passage of the fluid. In other words, as soon as the cross-section of the pilot hole 4 is greater than the annular cross-section of the passage between the main core and the body, the operation is ensured. If the pressure prevailing between the plug 15 and P1 is called the main core 13, the different phases of operation which have just been described can be analyzed in the following manner, by designating by F the force with which the main core is biased on one side or the other of the chamber 3
Rest: solenoid valve closed PO = P1
F = P1 S2 - Po (S2 - S1) = P1 S1 which is the resulting force which presses the main core on its seat.

Pilotage ouvert PO > P1
F = PO (S2 - S1) -P1 S2
P1 devenant très faible PO (S2 - S1) devient plus important que P1 S2. 2 La force F change donc de sens et le noyau principal s'ouvre.Open control PO> P1
F = PO (S2 - S1) -P1 S2
P1 becoming very weak PO (S2 - S1) becomes more important than P1 S2. 2 The force F therefore changes direction and the main nucleus opens.

PO baisse, P1 également. PO down, P1 too.

PO (S2 - S1) reste superieur à P1S2. Le noyau principal vient en butée sur le bouchon. PO (S2 - S1) remains higher than P1S2. The main core abuts the plug.

Pilotage se referme. P1 remonte à la valeur PO.  Piloting closes. P1 goes back to the PO value.

P1S2 devient supérieur à Po(S2 - S1). La force F s'inverse, le noyau principal se referme. P1S2 becomes greater than Po (S2 - S1). The force F reverses, the main nucleus closes.

PO et P1 s'équilibrent. PO and P1 are balanced.

On retrouve
F=P1S2 - P(S2 S S1) = P1S1. We find
F = P1S2 - P (S2 S S1) = P1S1.

Claims (1)

REVENDICATION CLAIM Electrovanne hydraulique pilotée, destinée notamment à la commande des boîtes de vitesse de véhicules, caractérisée en ce qu'elle se compose d'un corps cylindrique dans lequel sont pratiqués d'une part une chambre de pilotage axiale dans laquelle est logé le noyau d'un électroaimant entouré de sa carcasse et de son bobinage, obturant normalement l'orifice de sortie inférieur de cette chambre, et une chambre principale transversale à la précédente, dans laquelle est logé le noyau principal, normalement repoussé sous son siège par un ressort en obturant ainsi l'orifice de sortie de cette chambre, et présentant, par rapport à l'arrière de ladite chambre, un jeu annulaire autorisant le passage, vers sa face arrière, du fluide hydraulique, lesdites chambres étant en permanence en communication par un orifice de passage de section supérieure au jeu annulaire précité, de manière telle que, par excitation de l'électroaimant, le noyau de pilotage découvre l'orifice de sortie de la chambre de pilotage, provoquant l'écoulement du fluide suivant un trajet passant par l'arrière du noyau principal,et créant donc dans la chambre principale une dépression déterminant le recul du noyau principal,l'ouverture de l'orifice de sortie de la chambre principale, et par suite, l'alimentation en fluide du systeme de commande de la boîte de vitesse, l'arrêt de l'excitation de l'électroaimant ramenant les éléments dans leur position normale dans lesquelles les orifices de sortie principale et de pilotate sont tous les deux fermés.  Hydraulic piloted solenoid valve, intended in particular for the control of vehicle gearboxes, characterized in that it consists of a cylindrical body in which are formed on the one hand an axial piloting chamber in which is housed the core an electromagnet surrounded by its carcass and its winding, normally closing the lower outlet orifice of this chamber, and a main chamber transverse to the previous one, in which is housed the main core, normally pushed back under its seat by a spring while closing thus the outlet orifice of this chamber, and having, with respect to the rear of said chamber, an annular clearance allowing the passage, towards its rear face, of the hydraulic fluid, said chambers being permanently in communication by an orifice of passage of greater section than the aforementioned annular clearance, so that, by excitation of the electromagnet, the piloting core uncovers the outlet orifice of the p islanding, causing the fluid to flow along a path passing through the rear of the main core, and therefore creating in the main chamber a depression determining the recoil of the main core, the opening of the outlet orifice of the main chamber, and consequently, the supply of fluid to the gearbox control system, the stopping of the excitation of the electromagnet bringing the elements back to their normal position in which the main and pilot outlet ports are all two closed.
FR8419317A 1984-12-14 1984-12-14 Controlled oil valve Pending FR2574893A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8419317A FR2574893A1 (en) 1984-12-14 1984-12-14 Controlled oil valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8419317A FR2574893A1 (en) 1984-12-14 1984-12-14 Controlled oil valve

Publications (1)

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FR2574893A1 true FR2574893A1 (en) 1986-06-20

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FR8419317A Pending FR2574893A1 (en) 1984-12-14 1984-12-14 Controlled oil valve

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0369969A2 (en) * 1988-11-15 1990-05-23 Valvtech AB Valve for pressurized media

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3306570A (en) * 1963-10-07 1967-02-28 R D Cooksley Mfg Company Valves and valve structure
US3381932A (en) * 1967-02-16 1968-05-07 Richard H. O'kane Pressure differential valve

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3306570A (en) * 1963-10-07 1967-02-28 R D Cooksley Mfg Company Valves and valve structure
US3381932A (en) * 1967-02-16 1968-05-07 Richard H. O'kane Pressure differential valve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0369969A2 (en) * 1988-11-15 1990-05-23 Valvtech AB Valve for pressurized media
EP0369969A3 (en) * 1988-11-15 1991-02-06 Valvtech AB Valve for pressurized media

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