EP1409275A1 - Controlled pneumatic valve - Google Patents

Controlled pneumatic valve

Info

Publication number
EP1409275A1
EP1409275A1 EP02704850A EP02704850A EP1409275A1 EP 1409275 A1 EP1409275 A1 EP 1409275A1 EP 02704850 A EP02704850 A EP 02704850A EP 02704850 A EP02704850 A EP 02704850A EP 1409275 A1 EP1409275 A1 EP 1409275A1
Authority
EP
European Patent Office
Prior art keywords
valve
pressure
membrane
pneumatic
return valve
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Withdrawn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
EP02704850A
Other languages
German (de)
French (fr)
Inventor
Henri Beau
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.)
Syegon (SARL)
Original Assignee
Syegon (SARL)
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 Syegon (SARL) filed Critical Syegon (SARL)
Publication of EP1409275A1 publication Critical patent/EP1409275A1/en
Withdrawn legal-status Critical Current

Links

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
    • F16K15/00—Check valves
    • F16K15/20—Check valves specially designed for inflatable bodies, e.g. tyres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/001—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving
    • B60C23/003—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving comprising rotational joints between vehicle-mounted pressure sources and the tyres
    • B60C23/00354—Details of valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/001—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving
    • B60C23/003—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving comprising rotational joints between vehicle-mounted pressure sources and the tyres
    • B60C23/00372—Devices for manually or automatically controlling or distributing tyre pressure whilst the vehicle is moving comprising rotational joints between vehicle-mounted pressure sources and the tyres characterised by fluid diagrams
    • 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
    • F16K31/365—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor the fluid acting on a diaphragm
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/3584—Inflatable article [e.g., tire filling chuck and/or stem]

Definitions

  • the technical sector of the present invention is that of devices for remote control of the inflation and deflation of a capacity from a gaseous fluid under pressure and it aims, more particularly, at the remote control of the internal pressure of a tire on a wheel of a motor vehicle.
  • patent EP-0 296 017 describes a pneumatic piloted valve comprising a membrane connected to a controlled valve and held between a half-body and a grooved crown delimiting with the half-body a pilot chamber and with the grooved crown a chamber exhaust, the latter communicating with a bore opening into the capacity, the pilot chamber being subjected to a pressure-vacuum circuit through a tube, said controlled valve pushing the membrane in closing of the bore and incorporating coaxially a non-return valve.
  • Such a valve is satisfactory but suffers from a number of drawbacks. Indeed, this valve is difficult to use for agricultural type vehicles whose tires must be able to operate at relatively low pressures. Low pressure means pressure less than 10 5 Pa. This state of affairs is consecutive to the lack of tightness of the non-return valve, the forces depending on the low pressure retained in the capacity are not sufficient to perfect the contact between a ball and the seat of the non-return valve. .
  • the object of the present invention is therefore to solve the drawbacks mentioned above by providing a device which is perfectly reliable and usable over a wide pressure range.
  • the subject of the invention is therefore a piloted pneumatic valve, intended for the remote control of the inflation and deflation of a capacity, comprising a membrane held between a half-body and a grooved crown delimiting with the half-body a chamber of piloting and with the grooved crown an exhaust chamber, the latter communicating on the one hand with a bore opening into the capacity and on the other hand with the pilot chamber by means of a non-return valve housed in a body, the piloting chamber being in relation to a pressure-vacuum circuit through a tube, said controlled valve being linked to the membrane when the bore is closed, characterized in that it comprises mechanical means ensuring the opening of the non-return valve in addition to the pressure action to obtain an opening at low pressure of said valve.
  • the valve comprises an elastic element for holding the non-return valve in the closed position.
  • the elastic retaining element is of the spring type, one end of which is supported on the non-return valve and the other which is supported on the body .
  • the mechanical control means comprises a system for opening the non-return valve controlled by the membrane.
  • the opening system consists of a bridge fixed to the membrane and a finger disposed opposite the valve.
  • the non-return valve is of the ball or tapered piston type.
  • the connecting surface between the bridge and the membrane ensures a limitation of the deformation of said membrane.
  • the mechanical means ensures the centering of the valve.
  • the invention also relates to an installation for remote control of the inflation and deflation of a capacity comprising a pipe connecting the tubing of the pilot chamber to two branches leading, respectively, to a pressure-vacuum source, a control valve selective placed on each branch and a pressure gauge (M) arranged on the line between the valve and the distributors, comprising a pneumatic piloted valve as defined above.
  • An advantage of the valve according to the invention lies in perfect control of the seal at low pressure while retaining the advantages of the valve of the patent mentioned above, that is to say compactness and low cost, while ensuring.
  • Another advantage lies in the increased service life of the valve according to the invention.
  • FIG. 1 is a schematic view illustrating an example of installation of the object of the invention
  • FIG. 2 is a sectional view showing the valve according to the invention according to a first embodiment of the non-return valve.
  • FIG. 3 is a partial view of a second embodiment of the non-return valve of the valve according to the invention, '
  • FIG. 1 a pneumatic valve according to the invention, designated by the reference 1, applied to the pressure control of a tire 2 partially shown and mounted on a wheel of a motor vehicle not shown.
  • the valve 1 is connected to a pressure-vacuum circuit 3 by any means, such as for example, a structure with a rotating joint integrated in the axis of the wheel described in patent EP-0 296 017.
  • the piloting installation 3 includes a fluid circulation pipe 4 which separates into two branches 5 and 6 each connected to a distributor 7 and 8, advantageously with selective control.
  • the distributors 7 and 8 are respectively connected to a source of distribution of pressurized fluid 9 or to a vacuum source 10.
  • the pressure source 9 could be a compressed air accumulator or a compressor while the vacuum source 10 will be, for example, a vacuum pump 11 capable of being supplied by the pressure source 9 by means of a pipe 12 controlled by a tap 13.
  • the pneumatic piloted valve illustrated in more detail in FIG. 2, consists of a body 14 of inflation and deflation.
  • This body 14 is separated into two parts: a half-body 15 and a grooved crown 16, made of any suitable material, assembled in a removable manner or not, face against face and machined to delimit together a cavity 17.
  • the half-body 15 and the grooved crown 16 are made to pinch a deformable membrane 18 dividing the cavity 17 into two chambers 19 and 20 respectively, for piloting and for exhaust.
  • the membrane 18 is made integral according to the invention, at its " deformable part, with an opening system 28 of the valve.
  • the latter takes the general form of a bridge 29 on which a finger of thrust 30. This bridge 29 is linked to the membrane 18, for example by two rivets 31, the usefulness of which as a deformation limiter will be described below.
  • a controlled valve 21 assembled, for example by overmolding, with the membrane 18.
  • This controlled valve 21 consists of a body 22 integral with the membrane 18 and subjected to the forces of a spring 23 which externally surrounds the body 22.
  • This spring 23 is supported on one side on the internal face of the half-body 15 delimiting the cavity 17 and on the other on a cap 39a surrounding the body 22.
  • This cap is under the form of a tubular element opening at one end of which is provided a shoulder 39c of outside diameter greater than the diameter of the tubular element.
  • This shoulder comprises two axial adjournments 39b of necessary and sufficient dimension to allow the displacement of the opening system 28.
  • the spring 23 is supported on the upper face of the shoulder 39c.
  • the lower end of the cap 39a is supported on a heel of the body 22.
  • the half-body 15 and the grooved crown 16 form a compact assembly, of low height which can be integrated into the thickness of a rim 24 of a wheel 25.
  • the crown grooves 16 is associated with the half-body 14, preferably, but not exclusively, and is produced by stamping and associated, by any suitable means, with a pipe 26 connected to the pressure source.
  • the crown 16 is said to have grooves, since it has adjournments 27 which will allow the fluid to escape towards the outside during deflation.
  • the body 22 takes the form of a tube provided with a circular heel with an outside diameter greater than that of the tube.
  • the membrane 18, the body 22 and the opening system 28 thus form a unitary assembly of a low cost which can be easily stored, handled, assembled and disassembled.
  • a non-return valve 32 is fitted inside the body 22.
  • the body 22 is provided with an internal sleeve 33 having an axial bore 34 extended by a bore 36 of smaller diameter , thus forming at their junction a frustoconical support seat 37.
  • the non-return valve has a ball 35 maintained in constant support on the seat 37 by an elastic holding element 38, for example a spring.
  • This spring 38 will be calibrated on the one hand to ensure a perfect seal between the ball 35 on the seat 37 and on the other hand to compensate for the forces consecutive to centrifugal accelerations.
  • FIG 3 there is partially shown in section the body 22 equipped with another embodiment of the valve.
  • the body 22 is devoid of fur and is provided with a first axial bore 40 extended by a second 41 delimiting a bearing surface 42.
  • the body 22 is provided with a frustoconical valve 43 coming cooperating with the surface support 42 in order to close the bore 40 to prevent deflation of the tire.
  • the valve 43 is extended by a shoulder 44 capped by a spring 45 exerting a force observed on this valve.
  • the spring 45 is disposed on a flange of the body 22.
  • the valve 43 cooperates with the finger 30 secured to the bridge 29.
  • the finger 30 is intended to detach the valve 43 from the bearing surface in order to ensure the passage of air from the tire towards the outside and thus deflate it when the membrane 18, not shown in this figure, is actuated by spring 23.
  • the finger 30 penetrates inside a bore formed in the valve 43 and shown in dotted lines. This arrangement makes it possible to maintain the valve in a centered position relative to the bore 40.
  • the operating pressure limit at low pressure is fixed by the relative dimensioning of the components of the valve. It depends on the force provided by the spring return element of the valve and the active surface and on the efficiency of the membrane (yield).
  • the operating limit pressure is 10 4 Pa.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Multiple-Way Valves (AREA)
  • Fluid-Driven Valves (AREA)

Abstract

The invention relates to a controlled pneumatic valve intended for the remote inflating and deflating of an enclosed space (2) comprising a diaphragm (18) which is disposed between a semi-body (15) and a grooved ring (16). The diaphragm and the semi-body define a control chamber (19) while said diaphragm and the grooved ring define an exhaust chamber (20). Said exhaust chamber communicates with (i) a bore (2a) that opens into the enclosed space (2) and (ii) the control chamber (19) by means of a non-return valve (32) which is housed in a body (22). The control chamber (19) is connected to a pressure-vacuum circuit (3) by means of a tube (26). Said servo valve (32) pushes the diaphragm (18) in order to close the bore. The valve comprises a mechanical means (28) which is controlled by the diaphragm and which is used to open the non-return valve (32) in conjunction with the force of the pressure in order to produce a low-pressure opening in said non-return valve. Said means comprises a bridge (29) that is fixed to the diaphragm (18) and a pin (30) which is disposed opposite the non-return valve. The invention is suitable for low-pressure tyre control.

Description

DEMANDE DE BREVET D'INVENTION PATENT INVENTION APPLICATION
Le secteur technique de la présente invention est celui des dispositifs de contrôle à distance du gonflage et du dégonflage d'une capacité à partir d'un fluide gazeux sous pression et elle vise, plus particulièrement, le contrôle à distance de la pression interne d'un pneumatique d'une roue d'un véhicule automobile.The technical sector of the present invention is that of devices for remote control of the inflation and deflation of a capacity from a gaseous fluid under pressure and it aims, more particularly, at the remote control of the internal pressure of a tire on a wheel of a motor vehicle.
Dans le domaine d'application préféré ci-dessus, on sait qu'il est parfois utile 'de pouvoir contrôler à distance la pression de gonflage des pneumatiques d'un véhicule, de manière à pouvoir adapter la portance de ces derniers en fonction de l'état du sol sur lequel se déplace le véhicule. Ceci est, en particulier, le cas des véhicules tout terrain qui doivent pouvoir progresser dans les meilleures conditions sur des natures de sol en changement continuel tels des sols durs, caillouteux ou meubles. Cette adaptation doit pouvoir se faire sans que le conducteur soit astreint à interrompre sa progression pour effectuer, de façon manuelle lorsque le véhicule est à l'arrêt, un réglage ou un contrôle de la pression interne des pneumatiques du véhicule.In the preferred field of application above, it is known sometimes useful 'to be able to remotely control the inflation pressure of tires of a vehicle, so as to adjust the lift of the latter according to the state of the ground on which the vehicle is traveling. This is, in particular, the case of all-terrain vehicles which must be able to progress under the best conditions on types of soil in continuous change such as hard, stony or loose soil. This adaptation must be possible without the driver being obliged to interrupt his progression in order to carry out, manually, when the vehicle is stationary, an adjustment or a control of the internal pressure of the tires of the vehicle.
Ainsi, le brevet EP-0 296 017 décrit une valve pneumatique pilotée comprenant une membrane reliée à un clapet asservi et maintenue entre un demi-corps et une couronne rainurée délimitant avec le demi-corps une chambre de pilotage et avec la couronne rainurée une chambre d'échappement, cette dernière communiquant avec un alésage débouchant dans la capacité, la chambre de pilotage étant soumise à un circuit de pression-dépression au travers d'une tubulure, ledit clapet asservi poussant la membrane en fermeture de l'alésage et incorporant coaxialement un clapet anti-retour. Une telle valve donne satisfaction mais souffre d'un certain nombre d'inconvénients. En effet, cette valve est difficile à utiliser pour les véhicules de type agricoles dont les pneumatiques doivent pouvoir fonctionner à des pressions relativement faibles. On entend par pression faible une pression inférieure à 105 Pa. Cet état de fait est consécutif à l'absence d'étanchéité du clapet anti-retour, les forces dépendant de la faible pression retenue dans la capacité ne suffisent pas pour parfaire le contact entre une bille et le siège du clapet anti-retour.Thus, patent EP-0 296 017 describes a pneumatic piloted valve comprising a membrane connected to a controlled valve and held between a half-body and a grooved crown delimiting with the half-body a pilot chamber and with the grooved crown a chamber exhaust, the latter communicating with a bore opening into the capacity, the pilot chamber being subjected to a pressure-vacuum circuit through a tube, said controlled valve pushing the membrane in closing of the bore and incorporating coaxially a non-return valve. Such a valve is satisfactory but suffers from a number of drawbacks. Indeed, this valve is difficult to use for agricultural type vehicles whose tires must be able to operate at relatively low pressures. Low pressure means pressure less than 10 5 Pa. This state of affairs is consecutive to the lack of tightness of the non-return valve, the forces depending on the low pressure retained in the capacity are not sufficient to perfect the contact between a ball and the seat of the non-return valve. .
De plus, dans le cas d'un montage de la valve en position excentrée sur la roue, la force centrifuge agit sur la bille du clapet anti-retour et perturbe la fermeture de celui-ci provoquant un dégonflage progressif du pneumatique.In addition, in the case of mounting the valve in an eccentric position on the wheel, the centrifugal force acts on the ball of the non-return valve and disturbs the closing of the latter causing progressive deflation of the tire.
En outre, l'utilisation répétée de cette valve révèle un affaiblissement de la membrane.In addition, repeated use of this valve reveals a weakening of the membrane.
Le but de la présente invention est donc de résoudre les inconvénients précédemment cités en fournissant un dispositif parfaitement fiable et utilisable sur une large plage de pression.The object of the present invention is therefore to solve the drawbacks mentioned above by providing a device which is perfectly reliable and usable over a wide pressure range.
L'invention a donc pour objet une valve pneumatique pilotée, destinée à la commande à distance du gonflage et du dégonflage d'une capacité, comprenant une membrane maintenue entre un demi-corps et une couronne rainurée délimitant avec le demi-corps une chambre de pilotage et avec la couronne rainurée une chambre d'échappement, cette dernière communiquant d'une part avec un alésage débouchant dans la capacité et d'autre part avec la chambre de pilotage par l'intermédiaire d'un clapet anti-retour logé dans un corps, la chambre de pilotage étant en relation avec un circuit de pression-dépression au travers d'une tubulure, ledit clapet asservi étant lié à la membrane lors de la fermeture de l'alésage, caractérisée en ce qu'elle comprend un moyen mécanique assurant l'ouverture du clapet anti-retour en complément de l'action de la pression pour obtenir une ouverture à basse pression dudit clapet.The subject of the invention is therefore a piloted pneumatic valve, intended for the remote control of the inflation and deflation of a capacity, comprising a membrane held between a half-body and a grooved crown delimiting with the half-body a chamber of piloting and with the grooved crown an exhaust chamber, the latter communicating on the one hand with a bore opening into the capacity and on the other hand with the pilot chamber by means of a non-return valve housed in a body, the piloting chamber being in relation to a pressure-vacuum circuit through a tube, said controlled valve being linked to the membrane when the bore is closed, characterized in that it comprises mechanical means ensuring the opening of the non-return valve in addition to the pressure action to obtain an opening at low pressure of said valve.
Selon une caractéristique, la valve comprend un élément élastique de maintien du clapet anti-retour en position fermée.According to one characteristic, the valve comprises an elastic element for holding the non-return valve in the closed position.
Selon une autre caractéristique, l'élément élastique de maintien est du type ressort dont une extrémité est en appui sur le clapet anti-retour et l'autre en appui sur le corps .According to another characteristic, the elastic retaining element is of the spring type, one end of which is supported on the non-return valve and the other which is supported on the body .
Selon encore une caractéristique, le moyen mécanique de commande comprend un système d' ouverture du clapet antiretour commandé par la membrane. Avantageusement, le système d'ouverture est constitué d'un pont fixé à la membrane et d'un doigt disposé en regard du clapet.According to yet another characteristic, the mechanical control means comprises a system for opening the non-return valve controlled by the membrane. Advantageously, the opening system consists of a bridge fixed to the membrane and a finger disposed opposite the valve.
Avantageusement, le clapet anti-retour est du type à bille ou à piston tronconique. Selon encore une caractéristique, la surface de liaison entre le pont et la membrane assure une limitation de la déformation de ladite membrane.Advantageously, the non-return valve is of the ball or tapered piston type. According to another characteristic, the connecting surface between the bridge and the membrane ensures a limitation of the deformation of said membrane.
Selon encore une caractéristique, le moyen mécanique assure le centrage du clapet. L'invention vise également une installation de commande à distance du gonflage et du dégonflage d'une capacité comprenant une canalisation reliant la tubulure de la chambre de pilotage à deux dérivations menant, respectivement, à une source de pression-dépression, un distributeur à commande sélective placé sur chaque dérivation et un manomètre (M) disposé sur la ligne entre la valve et les distributeurs, comprenant une valve pneumatique pilotée telle que définie précédemment.According to another characteristic, the mechanical means ensures the centering of the valve. The invention also relates to an installation for remote control of the inflation and deflation of a capacity comprising a pipe connecting the tubing of the pilot chamber to two branches leading, respectively, to a pressure-vacuum source, a control valve selective placed on each branch and a pressure gauge (M) arranged on the line between the valve and the distributors, comprising a pneumatic piloted valve as defined above.
Un avantage de la valve selon l'invention réside un contrôle parfait de l'étanchéité à basse pression tout en conservant les avantages de la valve du brevet mentionné précédemment, c'est-à-dire compacité et faible coût, tout en assurant.An advantage of the valve according to the invention lies in perfect control of the seal at low pressure while retaining the advantages of the valve of the patent mentioned above, that is to say compactness and low cost, while ensuring.
Un autre avantage réside dans l'augmentation de durée de vie de la valve selon l'invention.Another advantage lies in the increased service life of the valve according to the invention.
Un autre avantage encore réside dans la possibilité d'un équilibrage des pressions entre deux pneus lors des phases de mesure. Cette possibilité trouve son intérêt dans le cas où on traite essieu par essieu. D'autres caractéristiques, détails et avantages de l'invention ressortiront plus clairement à la lecture du complément de description donné ci-après à titre indicatif en relation avec des dessins dans lesquels : - la figure 1 est une vue schématique illustrant un exemple d'installation de l'objet de l'invention,Yet another advantage lies in the possibility of balancing the pressures between two tires during the measurement phases. This possibility finds its interest in the case where it is treated axle by axle. Other characteristics, details and advantages of the invention will emerge more clearly on reading the additional description given below for information only in relation to the drawings in which: FIG. 1 is a schematic view illustrating an example of installation of the object of the invention,
- la figure 2 est une vue en coupe montrant la valve conforme à l'invention selon un premier mode de réalisation du clapet anti-retour.- Figure 2 is a sectional view showing the valve according to the invention according to a first embodiment of the non-return valve.
- la figure 3 est une vue partielle d'un second mode de réalisation du clapet anti-retour de la valve selon l'invention, '- Figure 3 is a partial view of a second embodiment of the non-return valve of the valve according to the invention, '
On a représenté sur la figure 1 une valve pneumatique selon l'invention, désignée par la référence 1, appliquée au contrôle de la pression d'un pneumatique 2 représenté partiellement et monté sur une roue d'un véhicule automobile non représenté. La valve 1 est raccordée à un circuit de pression-dépression 3 par tout moyen, comme par exemple, une structure à joint tournant intégrée dans l'axe de la roue décrit dans le brevet EP-0 296 017. L' installation de pilotage 3 comprend une canalisation 4 de circulation de fluide qui se sépare en deux dérivations 5 et 6 reliées chacune à un distributeur 7 et 8, avantageusement à commande sélective. Les distributeurs 7 et 8 sont raccordés respectivement à une source de distribution de fluide sous pression 9 ou à une source de mise en dépression 10. A titre illustratif, la source de pression 9 pourra être un accumulateur d'air comprimé ou un compresseur alors que la source de dépression 10 sera, par exemple, une trompe à vide 11 susceptible d'être alimentée par la source de pression 9 au moyen d'une canalisation 12 contrôlée par un robinet 13.There is shown in Figure 1 a pneumatic valve according to the invention, designated by the reference 1, applied to the pressure control of a tire 2 partially shown and mounted on a wheel of a motor vehicle not shown. The valve 1 is connected to a pressure-vacuum circuit 3 by any means, such as for example, a structure with a rotating joint integrated in the axis of the wheel described in patent EP-0 296 017. The piloting installation 3 includes a fluid circulation pipe 4 which separates into two branches 5 and 6 each connected to a distributor 7 and 8, advantageously with selective control. The distributors 7 and 8 are respectively connected to a source of distribution of pressurized fluid 9 or to a vacuum source 10. As an illustration, the pressure source 9 could be a compressed air accumulator or a compressor while the vacuum source 10 will be, for example, a vacuum pump 11 capable of being supplied by the pressure source 9 by means of a pipe 12 controlled by a tap 13.
Il va de soi que l'installation décrite ci-dessus n'est donnée qu'à titre d'exemple, car des circuits plus complexes, à même d'assumer d'autres fonctions, peuvent également être prévus. Il peut aussi être envisagé de réaliser une telle installation pour le pilotage à distance de chaque roue individuellement d' un véhicule automobile ou d' un groupe de ces roues ou encore de la totalité de ces dernières .It goes without saying that the installation described above is given only by way of example, since more complex circuits, capable of assuming other functions, can also be provided. It can also be envisaged to produce such an installation for the remote control of each wheel individually of a motor vehicle or of a group of these wheels or even of all of the latter.
La valve pneumatique pilotée 1, illustrée plus en détail sur la figure 2, est constituée d'un corps 14 de gonflage et dégonflage. Ce corps 14 est séparé en deux parties : un demi-corps 15 et une couronne rainurée 16, fabriqués en toute matière appropriée, assemblés de façon démontable ou non, face contre face et usinés pour délimiter ensembles une cavité 17. Le demi-corps 15 et la couronne rainurée 16 sont réalisés pour pincer une membrane 18 déformable divisant la cavité 17 en deux chambres respectivement 19 et 20, respectivement de pilotage et d'échappement. La membrane 18 est rendue solidaire selon l'invention, au niveau de sa "partie déformable, d'un système d'ouverture 28 de la valve. Ce dernier prend la forme générale d'un pont 29 sur lequel on a solidarisé un doigt de poussée 30. Ce pont 29 est lié à la membrane 18, par exemple par deux rivets 31, dont l'utilité en temps que limiteur de déformation sera décrite ci-après.The pneumatic piloted valve 1, illustrated in more detail in FIG. 2, consists of a body 14 of inflation and deflation. This body 14 is separated into two parts: a half-body 15 and a grooved crown 16, made of any suitable material, assembled in a removable manner or not, face against face and machined to delimit together a cavity 17. The half-body 15 and the grooved crown 16 are made to pinch a deformable membrane 18 dividing the cavity 17 into two chambers 19 and 20 respectively, for piloting and for exhaust. The membrane 18 is made integral according to the invention, at its " deformable part, with an opening system 28 of the valve. The latter takes the general form of a bridge 29 on which a finger of thrust 30. This bridge 29 is linked to the membrane 18, for example by two rivets 31, the usefulness of which as a deformation limiter will be described below.
Dans la chambre de pilotage 19 est placé un clapet asservi 21 assemblé, par exemple par surmoulage, avec la membrane 18. Ce clapet asservi 21 est constitué d'un corps 22 solidaire de la membrane 18 et soumis aux efforts d'un ressort 23 qui entoure extérieurement le corps 22. Ce ressort 23 se trouve en appui d'un côté sur la face interne du demi-corps 15 délimitant la cavité 17 et de l'autre sur un chapeau 39a entourant le corps 22. Ce chapeau se présente sous la forme d'un élément tubulaire débouchant à une extrémité duquel est prévu un épaulement 39c de diamètre extérieur supérieur au diamètre de l'élément tubulaire. Cet épaulement comporte deux ajournements axiaux 39b de dimension nécessaire et suffisante pour permettre le déplacement du système d'ouverture 28. Dans le plan de la figure, le ressort 23 est en appui sur la face supérieure de 1 ' épaulement 39c. L'extrémité inférieure du chapeau 39a est en appui sur un talon du corps 22.In the control chamber 19 is placed a controlled valve 21 assembled, for example by overmolding, with the membrane 18. This controlled valve 21 consists of a body 22 integral with the membrane 18 and subjected to the forces of a spring 23 which externally surrounds the body 22. This spring 23 is supported on one side on the internal face of the half-body 15 delimiting the cavity 17 and on the other on a cap 39a surrounding the body 22. This cap is under the form of a tubular element opening at one end of which is provided a shoulder 39c of outside diameter greater than the diameter of the tubular element. This shoulder comprises two axial adjournments 39b of necessary and sufficient dimension to allow the displacement of the opening system 28. In the plane of the figure, the spring 23 is supported on the upper face of the shoulder 39c. The lower end of the cap 39a is supported on a heel of the body 22.
Le demi-corps 15 et la couronne rainurée 16 forment un ensemble compact, de faible hauteur qui peut être intégré dans l'épaisseur d'une jante 24 d'une roue 25. A cette fin, il est avantageux de réaliser une couronne 16 à rainures qui se fixera, directement ou avec interposition d'un joint d' étanchéité, sur la paroi de la jante 24. La couronne à rainures 16 est associée au demi-corps 14, de préférence, mais non exclusivement, et est réalisée par emboutissage et associée, par tout moyen convenable, à une canalisation 26 reliée à la source de pression. La couronne 16 est dite à rainures, car elle présente des ajournements 27 qui permettront au fluide de s'échapper vers l'extérieur lors du dégonflage.The half-body 15 and the grooved crown 16 form a compact assembly, of low height which can be integrated into the thickness of a rim 24 of a wheel 25. To this end, it is advantageous to produce a crown 16 with grooves which will be fixed, directly or with the interposition of a seal, on the wall of the rim 24. The crown grooves 16 is associated with the half-body 14, preferably, but not exclusively, and is produced by stamping and associated, by any suitable means, with a pipe 26 connected to the pressure source. The crown 16 is said to have grooves, since it has adjournments 27 which will allow the fluid to escape towards the outside during deflation.
Selon ce mode de réalisation, le corps 22 prend la forme d'un tube muni d'un talon circulaire d'un diamètre extérieur supérieur à celui du tube. La membrane 18, le corps 22 et le système d'ouverture 28 forment ainsi un ensemble unitaire d'un faible coût pouvant être aisément stocké, manipulé, monté et démonté.According to this embodiment, the body 22 takes the form of a tube provided with a circular heel with an outside diameter greater than that of the tube. The membrane 18, the body 22 and the opening system 28 thus form a unitary assembly of a low cost which can be easily stored, handled, assembled and disassembled.
Un clapet anti-retour 32 est adapté à l'intérieur du corps 22. A cette fin mais sans que cela soit obligatoire, le corps 22 est pourvu d'une fourrure interne 33 possédant un alésage axial 34 prolongé par un alésage 36 de diamètre inférieur, formant ainsi à leur jonction un siège d'appui tronconique 37. Le clapet anti-retour possède une bille 35 maintenue en appui constant sur le siège 37 par un élément élastique de maintien 38, par exemple un ressort. Ce ressort 38 sera taré de manière d'une part pour assurer une parfaite étanchéité entre la bille 35 sur le siège 37 et d'autre part pour compenser les efforts consécutifs aux accélérations centrifuges.A non-return valve 32 is fitted inside the body 22. To this end but without this being compulsory, the body 22 is provided with an internal sleeve 33 having an axial bore 34 extended by a bore 36 of smaller diameter , thus forming at their junction a frustoconical support seat 37. The non-return valve has a ball 35 maintained in constant support on the seat 37 by an elastic holding element 38, for example a spring. This spring 38 will be calibrated on the one hand to ensure a perfect seal between the ball 35 on the seat 37 and on the other hand to compensate for the forces consecutive to centrifugal accelerations.
Sur la figure 3, on a représenté partiellement en coupe le corps 22 équipé d'une autre forme de réalisation du clapet. Dans cette configuration, le corps 22 est dépourvu de fourrure et est muni d'un premier alésage axial 40 prolongé par un second 41 délimitant une surface d'appui 42. Le corps 22 est muni d'un clapet 43 tronconique venant coopérant avec la surface d'appui 42 afin de fermer l'alésage 40 pour interdire le dégonflage du pneu. Le clapet 43 est prolongé par un épaulement 44 coiffé par un ressort 45 exerçant un effort constat sur ce clapet. Comme dans le mode de réalisation précédent, le ressort 45 est disposé sur une collerette du corps 22. Le clapet 43 coopère avec le doigt 30 solidaire du pont 29. Comme expliqué précédemment, le doigt 30 est destiné à décoller le clapet 43 de la surface d'appui afin d'assurer le passage de l'air du pneu vers l'extérieur et ainsi le dégonfler lorsque la membrane 18, non représentée sur cette figure, est actionnée par le ressort 23.In Figure 3, there is partially shown in section the body 22 equipped with another embodiment of the valve. In this configuration, the body 22 is devoid of fur and is provided with a first axial bore 40 extended by a second 41 delimiting a bearing surface 42. The body 22 is provided with a frustoconical valve 43 coming cooperating with the surface support 42 in order to close the bore 40 to prevent deflation of the tire. The valve 43 is extended by a shoulder 44 capped by a spring 45 exerting a force observed on this valve. As in the previous embodiment, the spring 45 is disposed on a flange of the body 22. The valve 43 cooperates with the finger 30 secured to the bridge 29. As explained above, the finger 30 is intended to detach the valve 43 from the bearing surface in order to ensure the passage of air from the tire towards the outside and thus deflate it when the membrane 18, not shown in this figure, is actuated by spring 23.
Suivant une réalisation particulière, le doigt 30 pénètre à l'intérieur d'un alésage pratiqué dans le clapet 43 et représenté en pointillé. Cette disposition permet de maintenir le clapet dans une position centrée par rapport à l'alésage 40.According to a particular embodiment, the finger 30 penetrates inside a bore formed in the valve 43 and shown in dotted lines. This arrangement makes it possible to maintain the valve in a centered position relative to the bore 40.
Par la poussée exercée par le doigt 30, on assure une communication entre la capacité 2 et la chambre de pilotage pour équilibrer les pressions lors de la mesure. On assure de cette façon la possibilité de mesurer les basses pressions, inférieures à 105 Pa, jusqu'à une valeur de l'ordre de 0,4.105 Pa. Cette valeur de pression est particulièrement adaptée à une application de la valve dans les engins agricoles. Le ressort 38 renforce l'action de la pression en assurant une étanchéité totale sur toute la plage de pression admissible de la capacité.By the thrust exerted by the finger 30, communication between the capacitor 2 and the piloting chamber is ensured to balance the pressures during the measurement. This ensures the possibility of measuring low pressures, less than 10 5 Pa, up to a value of the order of 0.4.10 5 Pa. This pressure value is particularly suitable for application of the valve in agricultural machinery. The spring 38 reinforces the action of the pressure by ensuring a total seal over the entire admissible pressure range of the capacity.
Il faut noter que la pression limite de fonctionnement en basse pression est fixée par le dimensionnement relatif des éléments constitutifs de la vanne. Elle dépend de l'effort fourni par l'élément ressort de rappel du clapet et de la surface active et de l'efficacité de la membrane (rendement). A titre d'illustration, pour une vanne équipée d'un ressort fournissant un effort de 5 N (compensant 1000 g pour un clapet de masse 0,5 g) et une membrane de 10 cm2, la pression limite de fonctionnement est de 104 Pa. Ainsi, si on mesure une pression inférieure à cette limite, le résultat est faux par excès à l'intérieur de cette pression limite (Préeiie≈ 0,03 bar et Piue=0,l bar). It should be noted that the operating pressure limit at low pressure is fixed by the relative dimensioning of the components of the valve. It depends on the force provided by the spring return element of the valve and the active surface and on the efficiency of the membrane (yield). By way of illustration, for a valve fitted with a spring providing a force of 5 N (compensating 1000 g for a mass valve 0.5 g) and a membrane of 10 cm 2 , the operating limit pressure is 10 4 Pa. Thus, if a pressure below this limit is measured, the result is false by excess within this limit pressure (Préeiie≈ 0.03 bar and Piue = 0.1 bar).

Claims

REVENDICATIONS
1. Valve pneumatique pilotée, destinée à la commande à distance du gonflage et du dégonflage d'une capacité (2), comprenant une membrane (18) maintenue entre un demi-corps (15) et une couronne (16) rainurée délimitant avec le demi- corps une chambre de pilotage (19) et avec la couronne rainurée une chambre d'échappement (20), cette dernière communiquant d'une part avec un alésage (2a) débouchant dans la capacité (2) et d'autre part avec la chambre de pilotage (19) par l'intermédiaire d'un clapet anti-retour (32) logé dans un corps (22), la chambre de pilotage (19) étant en relation avec un circuit (3) de pression- dépression au travers d'une tubulure (26), ledit clapet asservi (32) étant lié à la membrane (18) lors de la fermeture de l'alésage, caractérisée en ce qu'elle comprend un moyen mécanique (28) assurant l'ouverture du clapet anti-retour (32) en complément de l'action de la pression pour obtenir une ouverture à basse pression dudit clapet.1. Pneumatic piloted valve, intended for the remote control of inflation and deflation of a capacity (2), comprising a membrane (18) held between a half-body (15) and a grooved crown (16) delimiting with the half body a pilot chamber (19) and with the grooved crown an exhaust chamber (20), the latter communicating on the one hand with a bore (2a) opening into the capacity (2) and on the other hand with the pilot chamber (19) by means of a non-return valve (32) housed in a body (22), the pilot chamber (19) being in relation to a circuit (3) of pressure-depression at through a tube (26), said controlled valve (32) being linked to the membrane (18) when the bore is closed, characterized in that it comprises a mechanical means (28) ensuring the opening of the non-return valve (32) in addition to the pressure action to obtain an opening at low pressure of said valve.
2. Valve pneumatique pilotée selon la revendication 1, caractérisée en ce qu'elle comprend un élément élastique2. Pneumatic piloted valve according to claim 1, characterized in that it comprises an elastic element
(38) de maintien du clapet anti-retour (32) en position fermée .(38) for holding the non-return valve (32) in the closed position.
3. Valve pneumatique pilotée selon la revendication 2, caractérisée en ce que l'élément élastique (38) de maintien est du type ressort dont une extrémité est en appui sur le clapet anti-retour (32) et l'autre en appui sur le corps (22).3. Pneumatic piloted valve according to claim 2, characterized in that the elastic retaining element (38) is of the spring type, one end of which is supported on the non-return valve (32) and the other which is supported on the body (22).
4. Valve pneumatique pilotée selon l'une des revendications 1 à 3, caractérisée en ce que le moyen mécanique (28) de commande comprend un système d'ouverture (29, 30) du clapet anti-retour commandé par la membrane.4. Pneumatic piloted valve according to one of claims 1 to 3, characterized in that the mechanical control means (28) comprises an opening system (29, 30) of the non-return valve controlled by the membrane.
5. Valve pneumatique pilotée selon la revendication 4, caractérisée en ce que le système d'ouverture est constitué d'un pont (29) fixé à la membrane (18) et d'un doigt (30) disposé en regard du clapet.5. Pneumatic piloted valve according to claim 4, characterized in that the opening system consists of a bridge (29) fixed to the membrane (18) and a finger (30) disposed opposite the valve.
6. Valve pneumatique pilotée selon l'une des revendications précédentes, caractérisé en ce que le clapet anti-retour (32) est du type à bille (35) ou à piston tronconique (43) .6. Pneumatic piloted valve according to one of the preceding claims, characterized in that the non-return valve (32) is of the ball (35) or piston type frustoconical (43).
7. Valve pneumatique pilotée selon la revendication 5, caractérisé en ce que la surface de liaison entre le pont (29) et la membrane (18) assure une limitation de la déformation de ladite membrane.7. Pneumatic piloted valve according to claim 5, characterized in that the connection surface between the bridge (29) and the membrane (18) ensures a limitation of the deformation of said membrane.
8. Valve pneumatique selon l'une quelconque des revendications précédentes, caractérisée en ce que le moyen mécanique assure le centrage du clapet (32) .8. Pneumatic valve according to any one of the preceding claims, characterized in that the mechanical means ensures the centering of the valve (32).
9. Installation de commande à distance du gonflage et du dégonflage d'une capacité (2) comprenant une canalisation (4) reliant la tubulure de la chambre de pilotage à deux dérivations (5, 6) menant, respectivement, à une source de pression-dépression (9), un distributeur (7, 8) à commande sélective placé sur chaque dérivation et un manomètre (M) disposé sur la ligne entre la valve et les distributeurs, caractérisée en ce qu'elle comprend une valve pneumatique pilotée selon l'une quelconques des revendications précédentes. 9. Remote control installation for inflating and deflating a capacity (2) comprising a pipe (4) connecting the tubing of the pilot chamber to two branches (5, 6) leading, respectively, to a pressure source -depression (9), a distributor (7, 8) with selective control placed on each branch and a pressure gauge (M) disposed on the line between the valve and the distributors, characterized in that it comprises a pneumatic valve controlled according to the any of the preceding claims.
EP02704850A 2001-02-16 2002-02-15 Controlled pneumatic valve Withdrawn EP1409275A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0102166A FR2821140B1 (en) 2001-02-16 2001-02-16 PILOTED PNEUMATIC VALVE
FR0102166 2001-02-16
PCT/FR2002/000596 WO2002066268A1 (en) 2001-02-16 2002-02-15 Controlled pneumatic valve

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EP1409275A1 true EP1409275A1 (en) 2004-04-21

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EP (1) EP1409275A1 (en)
FR (1) FR2821140B1 (en)
WO (1) WO2002066268A1 (en)

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US20040020534A1 (en) 2004-02-05
FR2821140B1 (en) 2003-05-23

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