EP1137888B1 - Hydraulic distributor - Google Patents
Hydraulic distributor Download PDFInfo
- Publication number
- EP1137888B1 EP1137888B1 EP99957372A EP99957372A EP1137888B1 EP 1137888 B1 EP1137888 B1 EP 1137888B1 EP 99957372 A EP99957372 A EP 99957372A EP 99957372 A EP99957372 A EP 99957372A EP 1137888 B1 EP1137888 B1 EP 1137888B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plunger
- core
- cavity
- orifice
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections therefor
- F15B13/0407—Means for damping the valve member movement
-
- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0416—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor with means or adapted for load sensing
- F15B13/0417—Load sensing elements; Internal fluid connections therefor; Anti-saturation or pressure-compensation valves
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- 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
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7837—Direct response valves [i.e., check valve type]
- Y10T137/785—With retarder or dashpot
- Y10T137/7851—End of valve forms dashpot chamber
-
- 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
- Y10T137/8593—Systems
- Y10T137/87169—Supply and exhaust
-
- 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
- Y10T137/8593—Systems
- Y10T137/87169—Supply and exhaust
- Y10T137/87177—With bypass
- Y10T137/87185—Controlled by supply or exhaust valve
Definitions
- the present invention relates to improvements brought to hydraulic distributors as defined in the preamble of claim 1.
- the dispenser comprises a body 1 provided with a port P for admission of pressurized fluid from a hydraulic source (not shown).
- said orifice P is formed in the form of a channel 2 passing through the body 1 transversely to the plane of the drawing and opening onto the two main faces of said body serving as support when stacking side by side and one against the other of several distributors.
- At least one orifice T (constituted in the form of a channel crossing the body 1 transversely to the plane of the drawing and opening onto the two main faces of said body) is used to return the fluid to a reservoir (not shown).
- Two ports of work A, B can be connected to a device or receiver hydraulic (not shown).
- a distribution drawer 4 is able to slide in a bore 5 which passes longitudinally the body 1 and opens on two opposite faces end 6, 7 thereof.
- the body 1 and the drawer 4 have passages and / or pipes and / or grooves arranged to cooperate with a view to to establish and / or to interrupt the connections between the various holes P, A, B, T of the distributor body according to the axial position occupied by the slide in the bore.
- the specific arrangements of these passages and / or pipes and / or grooves are determined by the skilled person in relationship with the desired functions for the distributor.
- the body 1 has yet another transverse channel 8 extending between the main faces of the body and combined with at minus a pressure selector for transmitting, in a channel 18 located downstream of the distributor drawer 4, the higher (load sensing pressure or LS pressure) of the two pressures constituted respectively by the pressure in said channel upstream of the distributor and a pressure of work of the distributor.
- Channel 2 connected to the intake port P opens into the bore 5 of the body in an intake chamber 10 of it, near which another room 11 communicates, through a passage 12, with an accommodation 13 in which a sealed free sliding is mounted plunger 14.
- the passage 12 opens into the housing 13 at one end of it, here the lower end (corresponding to an end face of the plunger 14, here its lower end), while at its opposite end (here its upper end) the housing 13 opens into a cavity 15 in which the head 16 of the plunger 14.
- the head 16 enlarged relative to the body of the diver can rest on a shoulder formed at outlet of the housing 13 in the cavity 15 to retain the plunger 14.
- a spring 17 is provided in the cavity 15 for push the plunger 14 against said shoulder so to fix its position in the absence of pressure.
- Channel 8 above opens into cavity 15, so that the pressure prevailing in channel 8 is also present in the cavity 15 and is then exerted on the corresponding end of the plunger 14 (here its upper end).
- the plunger 14 is crossed by a channel axial 18 opening, on one side, into its end face in look from passage 12 and, on the other side, in a canal diametral 19 passing through the plunger 14 and arranged so to be closed by the wall of the housing 13 when the plunger 14 is in the rest position imposed by the spring 17 (shown in Figure 1) or in a non-position completely raised.
- Part 28 of the axial channel 18 is arranged in the form of a restriction or a nozzle.
- the portion of the drawer 4 which extends, in position neutral, between chambers 10 and 11 by isolating one of them the other is provided with progressivity notches 20 intended to ensure a controlled flow of hydraulic fluid in the correct direction when the drawer is moved in one direction or in the other.
- a distributor arranged as it has just been described gives satisfaction in its general principle of realization, however, it has a drawback in certain operating conditions.
- Such a distributor is not intended to be used alone, but to be combined with several other distributors of the same type for constitute a hydraulic distribution device multiple.
- the dispensers are then preferably stacked tightly against each other by their faces main or large faces so the conduits respective P, T and LS (channels 8) all communicate with the others and constitute conduits crossing stacking from side to side to ensure operation of the multiple distribution device.
- the object of the invention is therefore to propose an arrangement improved distributor which avoids this drawback and which leads to a rapid stabilization of the LS pressure in case of multiple orders.
- the balance arrangement which has just been exposed retains the basic provisions and operations of the scale equipping the known dispenser shown in fig. 1.
- the fixed central core incorporates the nozzle of the connection between the first end of the housing receiving the intake fluid and the second end of the housing under the pressure LS; the tubular plunger, sliding around the central core, ensures the generation of the differential pressure ⁇ p between the pressure of the fluid coming from the hydraulic source and the charge pressure supplied to the lateral opening of the housing, then to the working opening.
- the second orifice of the passage of the nucleus is provided with a restriction so that the displacement of the plunger is braked hydraulically: thus constitutes damping means (volume chamber variable defined between the tubular plunger and the core central and joined by said second nozzle in passing central) which control the movement of the tubular plunger and which avoid the vibration of it.
- the core includes, on the side of the second end of the housing, a enlarged body and, on the side of the first end of the housing, a narrowed portion;
- the tubular plunger includes a large diameter portion surrounding the body enlarged nucleus and a small diameter portion surrounding the narrowed part of the nucleus; and the enlarged nucleus body has a shorter length than the large diameter part of the plunger so as to define, between the core and the diver, the aforesaid annular chamber.
- the housing is constituted by a through bore on one face of the distributor body and this bore is closed by a watertight stopper which blocks the core in the housing.
- the central core is made of cast iron or in raw bronze casting and that the tubular plunger is made of steel and is ground on its inside.
- FIGS. 2A and 2B are partial views of the dispenser of FIG. 1 showing, in section and in two functional positions respective, the regulatory balance arranged according to the invention.
- FIGS. 2A and 2B we keep the same references to designate bodies identical to those of the figure 1.
- the balance designated as a whole by the reference 29, consists of two parts housed in the housing 13, namely a fixed central core 30 and a tubular plunger or piston 31 which is freely inserted sliding between the fixed core 30 and the housing 13.
- the fixed core 30 extends over the entire length of the housing 13, coaxial therewith.
- the core 13 which can be made of cast iron or in raw bronze casting, also extends through the lower chamber 12.
- the housing 13 opens onto the wall upper 32 of the dispenser and a tight sealing cap 33 this orifice by pushing the core against the opposite face 34 of the chamber 12, which immobilizes the core.
- the tubular plunger 31 which can be made up of steel with its rectified inner face, has a length less than that of the core and is externally shaped to seal (fig. 2A) or more or less (fig. 2B) depending on the position occupied by the plunger, the orifice lateral by which the conduits 21 open into the housing 13.
- central core 30 and the plunger tubular 31 are mutually shaped to define between them an annular chamber 35 of radial extent, the volume varies depending on the position of the diver.
- the plunger 31 has an annular surface 36 of radial extent and suitable for being subjected to pressure P intake fluid.
- the diver has a annular surface 37 of radial extent, opposite of the aforesaid surface 36 and suitable for being subjected to the LS pressure prevailing in the LS 8 duct and the chamber upper 15; this annular surface 37 belongs to a walls defining the abovementioned annular chamber 35 located between the core and the plunger.
- the core 30 is pierced with a central passage, here axial, 38.
- this passage 38 communicates via a radial channel 39 with the upper chamber 15 in which reigns the pressure LS.
- a second channel radial 40 communicates the axial passage with the chamber annular 35 so that the pressure LS prevailing in the axial passage 38 is applied, via the radial channel 39, to the annular surface 37 above.
- a third channel radial 41 is located towards the lower end of the core 30; this third radial channel 41 is arranged as a restriction or sprinkler 28 or incorporates such a sprinkler and remains closed by the plunger 31 as long as the charge pressure of the dispenser is not the highest charge pressure high, i.e. remains below the LS pressure prevailing in the upper room 15.
- the flow of the pressurized fluid LS is slowed down in or outside the annular chamber 35 by configuring the second radial channel 40 as a nozzle or by incorporating a sprinkler in said channel.
- the core 30 has, in its part upper body, an enlarged body 42 and, in its lower part, a smaller diameter part configured as a rod 43.
- the tubular plunger 31 comprises an upper portion 44 of larger diameter which surrounds the enlarged body 42 of the core, being interposed between the latter and the wall of the housing 13, and a lower part 45 of smaller diameter which surrounds the shaped part stem 43 of the core.
- the enlarged body 42 of the core 30 has a shorter length than the upper part 44 of larger diameter of the plunger 31, so that the above annular chamber 35 is defined between the facing portions of the rod-shaped part 43 of the core and the part larger diameter 44 of the plunger.
- the new arrangement of the regulatory balance is suitable for perform charge pressure detection functions highest, anti-saturation, and flow division load independent in the same way as the distributor's previous balance described in the document FR-A-2 689 575, but also the balance of regulation arranged according to the invention is protected against oscillations likely to be generated in the event of multiple simultaneous commands in one device multiple distribution.
- balance of regulation according to the invention can be mounted in a distributor body instead of a balance of previous type regulation.
Abstract
Description
La présente invention concerne des perfectionnements
apportés aux distributeurs hydrauliques
tels que définis dans le préambule
de la revendication 1.The present invention relates to improvements
brought to hydraulic distributors
as defined in the preamble
of
A la figure 1 des dessins annexés est représenté à titre d'exemple, en coupe transversale, un mode de réalisation connu d'un tel distributeur tel qu'il apparaít à la figure 1 du document FR-A-2 689 575 au nom de la Demanderesse.In Figure 1 of the accompanying drawings is shown in as an example, in cross section, an embodiment known to such a distributor as it appears in the Figure 1 of document FR-A-2 689 575 in the name of the Applicant.
Le distributeur comporte un corps 1 muni d'un
orifice P d'admission du fluide sous pression en provenance
d'une source hydraulique (non montrée). Dans l'exemple
représenté, ledit orifice P est constitué sous forme d'un
canal 2 traversant le corps 1 transversalement au plan du
dessin et débouchant sur les deux faces principales dudit
corps servant d'appui lors de l'empilage côte-à-côte et l'un
contre l'autre de plusieurs distributeurs. Au moins un
orifice T (constitué sous forme d'un canal traversant le
corps 1 transversalement au plan du dessin et débouchant sur
les deux faces principales dudit corps) sert au retour du
fluide vers un réservoir (non représenté). Deux orifices de
travail A, B sont raccordables à un appareil ou récepteur
hydraulique (non représenté). Un tiroir 4 de distribution
est apte à coulisser dans un alésage 5 qui traverse longitudinalement
le corps 1 et débouche sur deux faces opposées
d'extrémité 6, 7 de celui-ci. De façon classique, le corps
1 et le tiroir 4 comportent des passages et/ou des canalisations
et/ou des gorges agencés de manière à coopérer en vue
d'établir et/ou d'interrompre les liaisons entre les divers
orifices P, A, B, T du corps du distributeur selon la
position axiale occupée par le tiroir dans l'alésage. Les
agencements spécifiques de ces passages et/ou canalisations
et/ou gorges sont déterminés par l'Homme de Métier en
relation avec les fonctions souhaitées pour le distributeur.The dispenser comprises a
En outre, dans cet exemple spécifique, le corps 1
comporte encore un autre canal transversal 8 s'étendant
entre les faces principales du corps et combiné avec au
moins un sélecteur de pression permettant de transmettre,
dans un canal 18 situé en aval du tiroir distributeur 4, la
plus forte (pression "load sensing" ou pression LS) des deux
pressions constituées respectivement par la pression dans
ledit canal en amont du distributeur et une pression de
travail du distributeur.Furthermore, in this specific example, the
Le canal 2 raccordé à l'orifice d'admission P
débouche dans l'alésage 5 du corps dans une chambre d'admission
10 de celui-ci, à proximité de laquelle une autre
chambre 11 communique, par un passage 12, avec un logement
13 dans lequel est monté à libre coulissement étanche un
plongeur 14. Le passage 12 débouche dans le logement 13 à
une extrémité de celui-ci, ici l'extrémité inférieure
(correspondant à une face d'extrémité du plongeur 14, ici
son extrémité inférieure), tandis qu'à son extrémité opposée
(ici son extrémité supérieure) le logement 13 débouche dans
une cavité 15 dans laquelle peut se déplacer la tête 16 du
plongeur 14. La tête 16, élargie par rapport au corps du
plongeur, peut prendre appui sur un épaulement formé au
débouché du logement 13 dans la cavité 15 pour retenir le
plongeur 14. Un ressort 17 est prévu dans la cavité 15 pour
repousser le plongeur 14 contre ledit épaulement de manière
à fixer sa position en l'absence de pression. Le canal 8
précité débouche dans la cavité 15, de telle sorte que la
pression règnant dans le canal 8 soit également présente
dans la cavité 15 et s'exerce alors sur l'extrémité correspondante
du plongeur 14 (ici son extrémité supérieure).
En outre, le plongeur 14 est traversé par un canal
axial 18 débouchant, d'un côté, dans sa face d'extrémité en
regard du passage 12 et, de l'autre côté, dans un canal
diamétral 19 traversant le plongeur 14 et disposé de manière
à être obturé par la paroi du logement 13 lorsque le
plongeur 14 est dans la position de repos imposée par le
ressort 17 (montré à la figure 1) ou dans une position non
complètement relevée. Une partie 28 du canal axial 18 est
agencé sous forme d'une restriction ou d'un gicleur.In addition, the plunger 14 is crossed by a channel
axial 18 opening, on one side, into its end face in
look from
La portion du tiroir 4 qui s'étend, en position
neutre, entre les chambres 10 et 11 en les isolant l'une de
l'autre est munie d'encoches de progressivité 20 destinées
à assurer un écoulement contrôlé du fluide hydraulique dans
le sens approprié lorsque le tiroir est déplacé dans un sens
ou dans l'autre.The portion of the
A partir du logement 13 précité s'étendent, dans
deux directions approximativement diamétralement opposées,
deux conduits 21 dans un desquels ou dans chacun desquels
est disposé un clapet antiretour 22, les deux conduits 21
débouchant, dans l'alésage 5, dans deux chambres respectives
23.From the
A proximité des chambres 23, deux chambres de
distribution respectives 24 de l'alésage 5 sont réunies, par
des conduits 25, aux orifices de travail ou orifices de
départ respectifs A et B du distributeur.Near
Enfin, au-delà des chambres de distribution 24,
respectivement deux chambres de retour 26 de l'alésage 5
sont raccordées, par des conduits 27, au canal de retour 3
débouchant sur l'orifice de retour T.Finally, beyond the
Le fonctionnement du distributeur qui vient d'être décrit est exposé de façon détaillée dans le document FR 2 689 575 déjà cité, auquel on pourra se reporter.The operation of the distributor which has just been described is detailed in the document FR 2,689,575 already cited, to which reference may be made.
Bien qu'un distributeur agencé comme il vient d'être décrit donne satisfaction dans son principe général de réalisation, il présente toutefois un inconvénient dans certaines conditions de fonctionnement. Un tel distributeur est destiné non pas à être utilisé seul, mais à être associé avec plusieurs autres distributeurs de même type pour constituer un dispositif de distribution hydraulique multiple. Les distributeurs sont alors de préférence empilés de façon étanche les uns contre les autres par leurs faces principales ou grandes faces de sorte que les conduits respectifs P, T et LS (canaux 8) communiquent tous les uns avec les autres et constituent des conduits traversant l'empilement de part en part pour assurer le fonctionnement du dispositif de distribution multiple.Although a distributor arranged as it has just been described gives satisfaction in its general principle of realization, however, it has a drawback in certain operating conditions. Such a distributor is not intended to be used alone, but to be combined with several other distributors of the same type for constitute a hydraulic distribution device multiple. The dispensers are then preferably stacked tightly against each other by their faces main or large faces so the conduits respective P, T and LS (channels 8) all communicate with the others and constitute conduits crossing stacking from side to side to ensure operation of the multiple distribution device.
Lorsque, dans un tel dispositif de distribution multiple, plusieurs tranches (distributeurs unitaires) sont commandées simultanément pour des mouvements importants des récepteurs hydrauliques asservis, il apparaít des instabilités dûes à une insuffisance d'amortissement des mouvements des balances. Autrement dit, en raison des déplacements simultanés des balances dans les distributeurs respectifs, les balances réagissent les unes sur les autres par l'inter-médiaire du canal LS et un équilibre de la pression LS ne s'établit que difficilement.When, in such a distribution device multiple, several units (single distributors) are simultaneously controlled for large movements of slaved hydraulic receivers, instabilities appear due to insufficient damping of movements scales. In other words, because of the displacement scales in the respective distributors, scales react with each other through the medium of the LS channel and an LS pressure balance does is difficult to establish.
L'invention a donc pour but de proposer un agencement perfectionné du distributeur qui évite cet inconvénient et qui conduise à une stabilisation rapide de la pression LS en cas de commande multiple.The object of the invention is therefore to propose an arrangement improved distributor which avoids this drawback and which leads to a rapid stabilization of the LS pressure in case of multiple orders.
A cet effet, il est proposé un distributeur hydraulique tel que
défini dans la revendication 1. To this end, a hydraulic distributor is proposed such as
defined in
L'agencement de balance qui vient d'être exposé conserve les dispositions et fonctionnements de base de la balance équipant le distributeur connu représenté à la fig. 1. Le noyau central fixe incorpore le gicleur du conduit de liaison entre la première extrémité du logement recevant le fluide d'admission et la seconde extrémité du logement sous la pression LS ; le plongeur tubulaire, coulissant autour du noyau central, assure la génération du différentiel de pression Δp entre la pression du fluide en provenance de la source hydraulique et la pression de charge fournie à l'orifice latéral du logement, puis à l'orifice de travail.The balance arrangement which has just been exposed retains the basic provisions and operations of the scale equipping the known dispenser shown in fig. 1. The fixed central core incorporates the nozzle of the connection between the first end of the housing receiving the intake fluid and the second end of the housing under the pressure LS; the tubular plunger, sliding around the central core, ensures the generation of the differential pressure Δp between the pressure of the fluid coming from the hydraulic source and the charge pressure supplied to the lateral opening of the housing, then to the working opening.
De préférence, en outre, le deuxième orifice du passage du noyau est pourvu d'une restriction de manière que le déplacement du plongeur soit freiné hydrauliquement : on constitue ainsi des moyens d'amortissement (chambre à volume variable définie entre le plongeur tubulaire et le noyau central et réunie par ledit second gicleur au passage central) qui contrôlent le déplacement du plongeur tubulaire et qui évitent la vibration de celui-ci.Preferably, moreover, the second orifice of the passage of the nucleus is provided with a restriction so that the displacement of the plunger is braked hydraulically: thus constitutes damping means (volume chamber variable defined between the tubular plunger and the core central and joined by said second nozzle in passing central) which control the movement of the tubular plunger and which avoid the vibration of it.
Dans un mode de réalisation avantageux, le noyau comprend, du côté de la seconde extrémité du logement, un corps élargi et, du côté de la première extrémité du logement, une partie rétrécie ; le plongeur tubulaire comprend une partie de grand diamètre entourant le corps élargi du noyau et une partie de petit diamètre entourant la partie rétrécie du noyau ; et le corps élargi du noyau possède une longueur moindre que la partie de grand diamètre du plongeur de manière à définir, entre le noyau et le plongeur, la susdite chambre annulaire.In an advantageous embodiment, the core includes, on the side of the second end of the housing, a enlarged body and, on the side of the first end of the housing, a narrowed portion; the tubular plunger includes a large diameter portion surrounding the body enlarged nucleus and a small diameter portion surrounding the narrowed part of the nucleus; and the enlarged nucleus body has a shorter length than the large diameter part of the plunger so as to define, between the core and the diver, the aforesaid annular chamber.
De façon intéressante, la restriction de la balance est disposée dans le troisième orifice précité du passage du noyau.Interestingly, restricting the balance is arranged in the third aforementioned opening of the passage of the core.
Dans un exemple de réalisation structurellement simple, le logement est constitué par un alésage débouchant sur une face du corps du distributeur et cet alésage est obturé par un bouchon étanche qui bloque le noyau dans le logement.In a structural example simple, the housing is constituted by a through bore on one face of the distributor body and this bore is closed by a watertight stopper which blocks the core in the housing.
Enfin, pour réduire autant que possible les usinages de pièces, on peut prévoir que le noyau central est en fonte ou en bronze brut de moulage et que le plongeur tubulaire est en acier et est rectifié sur sa face intérieure.Finally, to reduce machining as much as possible parts, we can predict that the central core is made of cast iron or in raw bronze casting and that the tubular plunger is made of steel and is ground on its inside.
L'invention sera mieux comprise à la lecture de la description détaillée qui suit d'un mode de réalisation préféré d'un distributeur hydraulique agencé selon l'invention. Dans cette description, on se réfère aux figures 2A et 2B qui sont des vues partielles du distributeur de la figure 1 montrant, en coupe et dans deux positions fonctionnelles respectives différentes, la balance de régulation agencée selon l'invention.The invention will be better understood on reading the detailed description which follows of an embodiment preferred of a hydraulic distributor arranged according to the invention. In this description, reference is made to FIGS. 2A and 2B which are partial views of the dispenser of FIG. 1 showing, in section and in two functional positions respective, the regulatory balance arranged according to the invention.
Sur les figures 2A et 2B, on conserve les mêmes références pour désigner les organes identiques à ceux de la figure 1.In FIGS. 2A and 2B, we keep the same references to designate bodies identical to those of the figure 1.
La balance, désignée dans son ensemble par la
référence 29, est constituée de deux pièces abritées dans le
logement 13, à savoir un noyau central fixe 30 et un
plongeur tubulaire ou piston 31 qui est inserré à libre
coulissement entre le noyau fixe 30 et le logement 13.The balance, designated as a whole by the
Le noyau fixe 30 s'étend sur toute la longueur du
logement 13, coaxialement à celui-ci. Dans l'exemple de
réalisation de structure simple qui est illustré sur les
figures 2A-2B, le noyau 13, qui peut être constitué en fonte
ou en bronze brut de moulage, s'étend également à travers la
chambre inférieure 12. Le logement 13 débouche sur la paroi
supérieure 32 du distributeur et un bouchon étanche 33 ferme
cet orifice en repoussant le noyau contre la face opposée 34
de la chambre 12, ce qui immobilise le noyau.The
Le plongeur tubulaire 31, qui peut être constitué en
acier avec sa face intérieure rectifiée, possède une
longueur inférieure à celle du noyau et est extérieurement
conformé pout obturer (fig. 2A) ou découvrir plus ou moins
(fig. 2B) selon la position occupée par le plongeur, l'orifice
latéral par lequel les conduits 21 débouchent dans le
logement 13.The
En outre, le noyau central 30 et le plongeur
tubulaire 31 sont mutuellement conformés pour définir entre
eux une chambre annulaire 35 d'étendue radiale dont le
volume varie en fonction de la position du plongeur.In addition, the
Le plongeur 31 possède une surface annulaire 36
d'étendue radiale et propre à être soumise à la pression P
du fluide d'admission. De même, le plongeur possède une
surface annulaire 37 d'étendue radiale, tournée à l'opposé
de la susdite surface 36 et propre à être soumise à la
pression LS régnant dans le conduit LS 8 et la chambre
supérieure 15 ; cette surface annulaire 37 appartient à une
des parois définissant la chambre annulaire 35 précitée
située entre le noyau et le plongeur.The
Enfin, pour assurer la distribution appropriée des
pressions, le noyau 30 est percé d'un passage central, ici
axial, 38. A ou vers son extrémité supérieure, ce passage 38
communique par un canal radial 39 avec la chambre supérieure
15 dans laquelle règne la pression LS. Un deuxième canal
radial 40 fait communiquer le passage axial avec la chambre
annulaire 35 de manière que la pression LS qui règne dans le
passage axial 38 soit appliquée, via le canal radial 39, sur
la surface annulaire 37 précitée. Enfin, un troisième canal
radial 41 est situé vers l'extrémité inférieure du noyau 30;
ce troisième canal radial 41 est agencé en tant que restriction
ou gicleur 28 ou incorpore un tel gicleur et reste
obturé par le plongeur 31 tant que la pression de charge du
distributeur ne constitue pas la pression de charge la plus
élevée, c'est-à-dire reste inférieure à la pression LS
règnant dans la chambre supérieure 15.Finally, to ensure the proper distribution of
pressures, the
Pour amortir le déplacement du plongeur 31 et éviter
ainsi sa vibration en cas de commande multiple simultanée,
on freine l'écoulement du fluide sous pression LS dans ou
hors de la chambre annulaire 35 en configurant le deuxième
canal radial 40 en tant que gicleur ou en incorporant un
gicleur dans ledit canal. To dampen the displacement of the
Pour obtenir un agencement structurel simple, avec
un petit nombre de pièces composantes de fabrication peu
complexe, on prévoit que le noyau 30 possède, dans sa partie
supérieure, un corps élargi 42 et, dans sa partie inférieure,
une partie de plus faible diamètre configurée en tige
43. De la même manière, le plongeur tubulaire 31 comprend
une partie supérieure 44 de plus grand diamètre qui entoure
le corps élargi 42 du noyau, en étant intercalé entre celui-ci
et la paroi du logement 13, et une partie inférieure 45
de plus petit diamètre qui entoure la partie en forme de
tige 43 du noyau. En outre, le corps élargi 42 du noyau 30
possède une longueur moindre que la partie supérieure 44 de
plus grand diamètre du plongeur 31, de sorte que la susdite
chambre annulaire 35 est définie entre les portions en vis-à-vis
de la partie en forme de tige 43 du noyau et la partie
de plus grand diamètre 44 du plongeur.To obtain a simple structural arrangement, with
a small number of manufacturing component parts little
complex, it is expected that the
Enfin les parties supérieure 44 de plus grand
diamètre et inférieure 45 de plus faible diamètre du
plongeur se raccordent l'un à l'autre par une paroi annulaire
d'étendue radiale 46 dont les deux faces respectivement
supérieure (intérieure à la chambre 35) et inférieure
(tournée vers la chambre 12) constituent les deux surfaces
précitées 37 soumise à la pression LS et 36 soumise à la
pression d'admission P, respectivement.Finally the
Grâce aux dispositions de l'invention, non seulement le nouvel agencement de la balance de régulation est apte à assurer les fonctions de détection de la pression de charge la plus élevée, antisaturation, et division de débit indépendante de la charge de la même manière que la balance antérieure du distributeur décrit dans le document FR-A-2 689 575, mais en outre la balance de régulation agencée selon l'invention est protégée contre les oscillations susceptibles d'être engendrées en cas de commandes multiples simultanées dans un dispositif de distribution multiple. On améliore ainsi considérablement les conditions de fonctionnement du récepteur hydraulique commandé par le distributeur et l'on simplifie notablement les conditions de travail de l'utilisateur qui n'a, désormais, plus à se soucier d'éviter de commander simultanément plusieurs récepteurs hydrauliques.Thanks to the provisions of the invention, not only the new arrangement of the regulatory balance is suitable for perform charge pressure detection functions highest, anti-saturation, and flow division load independent in the same way as the distributor's previous balance described in the document FR-A-2 689 575, but also the balance of regulation arranged according to the invention is protected against oscillations likely to be generated in the event of multiple simultaneous commands in one device multiple distribution. We thus considerably improve the operating conditions of the hydraulic receiver ordered by the distributor and we significantly simplify the working conditions of the user who, from now on, more to worry about avoiding ordering simultaneously several hydraulic receivers.
En outre, on notera que les dispositions techniques mises en oeuvre à cet effet restent simples, que le nombre des pièces composantes est réduit et que leur fabrication ne nécessite que des usinages courants.In addition, it should be noted that the technical provisions implemented for this purpose remain simple, that the number component parts is reduced and their manufacture does not requires only normal machining.
Enfin, on notera également que la balance de régulation conforme à l'invention peut être montée dans un corps de distributeur en lieu et place d'une balance de régulation de type antérieur.Finally, it will also be noted that the balance of regulation according to the invention can be mounted in a distributor body instead of a balance of previous type regulation.
Claims (6)
- Hydraulic distributor intended to be associated with at least one other distributor of the same type and comprising a regulating balance able to perform a function of detecting the highest charge pressure, an antisaturation function and a function of load independent delivery division, said balance comprising a cavity (13) hollowed in the distributor body in which a plunger (31) is movable, this cavity (13) comprising:characterized in that the balance includes:a first end (12) able to receive selectively the pressurized hydraulic fluid (P) delivered by a hydraulic source,a second end (15) in communication with a channel (8) conveying the highest load pressure (LS), anda lateral orifice (21) communicating selectively with a working orifice (A, B) of the distributor,said plunger (31) including a passage (38) provided with a restriction (28) which opens, on one side, towards said first end (12) of the cavity and, on the other, opens laterally so as to open into said second end (15) of the cavity when the plunger (31) is in a position determined by the excess of said intake pressure (P) reduced by the pressure drop (Δp) caused by the restriction, as compared to the highest load pressure (LS) prevailing in said second end of the cavity, said plunger (14) being arranged to uncover the lateral orifice (21) of cavity and to connect the latter with the first end (12) of the cavity in proportion to the pressure differential (Δp) between the intake pressure and the highest load pressure prevailing in the second end of the cavity,a fixed central core (30) extending inside the cavity (13) co-axially therewith,said plunger (31) being formed as a tubular plunger (31) interposed freely sliding, co-axially, between the core (30) and the cavity (13), said plunger (31) having a length less than that of core (30) and being externally configured to cover or uncover the lateral orifice (21) of the cavity more or less according to its position,the core (30) and the plunger (31) being mutually configured to define between them an annular chamber (35) having a first radially-extending annular surface (37) defined on the plunger (31), anda second radially-extending annular surface (36) located on the plunger (31) and facing away from the first surface (37) and being able to be subjected to the pressure (P) of the intake fluid,said central passage (38) being formed in the core (30) and including a first orifice (39) opening in said second end (15) of the cavity (13) in which the higher load pressure (LS) prevails, a second orifice (40) opening in said annular chamber (35) between the core and the plunger so that the pressure (LS) is exerted on said first annular surface (37) of said annular chamber (35), and a third orifice (41) located opposite said first end (12) of housing (13) and closed by the plunger (31) as long as the load pressure of the distributor does not constitute the highest load pressure.
- Hydraulic distributor according to Claim 1, characterized in that the second orifice (40) of passage (38) of the core is provided with a restriction so that the movement of the plunger is hydraulically damped.
- Hydraulic distributor according to Claim 1 or 2, characterized in that the core (30) includes a widened body (42) in the area of the second end (15) of the cavity and a narrowed portion (43) in the area of the first end of the cavity,
and in that the tubular plunger (31) includes a portion (44) of large diameter surrounding the widened body (42) of the core and a portion (45) of small diameter surrounding the narrowed portion (43) of the core,
the length of the widened body (42) of the core being less than that of the large-diameter portion (44) of the plunger so as to define said annular chamber (35) between the core and the plunger. - Hydraulic distributor according to one of the preceding claims, characterized in that the restriction of the balance is arranged in said third orifice (41) of passage (38) of the core.
- Hydraulic distributor according to one of the preceding claims, characterized in that the housing (13) is constituted by a bore opening on one face of the distributor body and in that this bore is closed by a fluid-tight plug (33) which blocks the core (30) in the housing (13).
- Hydraulic distributor according to one of the preceding claims, characterized in that the central core (30) is made of unfinished cast iron or bronze and in that the tubular plunger (31) is made of steel and is precision-finished on its internal face.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9815523A FR2787148B1 (en) | 1998-12-09 | 1998-12-09 | HYDRAULIC DISTRIBUTOR |
| FR9815523 | 1998-12-09 | ||
| PCT/FR1999/003052 WO2000034665A1 (en) | 1998-12-09 | 1999-12-08 | Hydraulic distributor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1137888A1 EP1137888A1 (en) | 2001-10-04 |
| EP1137888B1 true EP1137888B1 (en) | 2003-05-07 |
Family
ID=9533755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99957372A Expired - Lifetime EP1137888B1 (en) | 1998-12-09 | 1999-12-08 | Hydraulic distributor |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6532989B1 (en) |
| EP (1) | EP1137888B1 (en) |
| JP (1) | JP4603166B2 (en) |
| AT (1) | ATE239875T1 (en) |
| DE (1) | DE69907730T2 (en) |
| FR (1) | FR2787148B1 (en) |
| WO (1) | WO2000034665A1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10219717B3 (en) * | 2002-05-02 | 2004-02-05 | Sauer-Danfoss (Nordborg) A/S | Hydraulic valve arrangement |
| DE10325296A1 (en) * | 2003-06-04 | 2004-12-23 | Bosch Rexroth Ag | Hydraulic control arrangement |
| US7182097B2 (en) * | 2004-08-17 | 2007-02-27 | Walvoil S.P.A. | Anti-saturation directional control valve composed of two or more sections with pressure selector compensators |
| JP4986884B2 (en) * | 2008-02-28 | 2012-07-25 | カヤバ工業株式会社 | Load sensing valve |
| IT1395462B1 (en) * | 2009-09-03 | 2012-09-21 | Brevini Fluid Power S P A | DISTRIBUTION VALVE |
| KR101115355B1 (en) | 2011-11-15 | 2012-03-06 | 주식회사 에스엔티 | Pressure control valve apparatus |
| EP2980416B1 (en) * | 2014-07-31 | 2019-06-05 | Bucher Hydraulics S.p.A. | Hydraulic section for load sensing applications and multiple hydraulic distributor |
| JP6314903B2 (en) * | 2015-05-08 | 2018-04-25 | Smc株式会社 | Flow path unit and switching valve |
| CN108869434B (en) * | 2018-09-21 | 2019-11-26 | 浙江达柏林阀门有限公司 | A kind of balanced valve |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3901264A (en) * | 1972-03-06 | 1975-08-26 | Gresen Manufacturing Co | Adjustable flow control for hydraulic valves having high pressure main supply and controls fluid flow to cylinder and exhaust ports |
| JPH0786361B2 (en) * | 1988-11-10 | 1995-09-20 | 株式会社ゼクセル | Hydraulic control valve |
| JP2740223B2 (en) * | 1989-01-09 | 1998-04-15 | 日立建機株式会社 | Valve device |
| JPH0758082B2 (en) * | 1990-06-22 | 1995-06-21 | 株式会社ゼクセル | Hydraulic control valve device |
| FR2689575B1 (en) * | 1992-04-06 | 1994-07-08 | Rexroth Sigma | HYDRAULIC DISTRIBUTOR WITH PRESSURE COMPENSATION AND A MAXIMUM PRESSURE SELECTION FOR DRIVING A PUMP AND MULTIPLE HYDRAULIC CONTROL INCLUDING SUCH DISTRIBUTORS. |
| US5791142A (en) * | 1997-03-27 | 1998-08-11 | Husco International, Inc. | Hydraulic control valve system with split pressure compensator |
-
1998
- 1998-12-09 FR FR9815523A patent/FR2787148B1/en not_active Expired - Lifetime
-
1999
- 1999-12-08 WO PCT/FR1999/003052 patent/WO2000034665A1/en active IP Right Grant
- 1999-12-08 AT AT99957372T patent/ATE239875T1/en active
- 1999-12-08 DE DE69907730T patent/DE69907730T2/en not_active Expired - Lifetime
- 1999-12-08 EP EP99957372A patent/EP1137888B1/en not_active Expired - Lifetime
- 1999-12-08 JP JP2000587087A patent/JP4603166B2/en not_active Expired - Lifetime
- 1999-12-08 US US09/857,586 patent/US6532989B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP1137888A1 (en) | 2001-10-04 |
| JP2002531793A (en) | 2002-09-24 |
| JP4603166B2 (en) | 2010-12-22 |
| DE69907730D1 (en) | 2003-06-12 |
| US6532989B1 (en) | 2003-03-18 |
| FR2787148A1 (en) | 2000-06-16 |
| FR2787148B1 (en) | 2001-02-16 |
| WO2000034665A1 (en) | 2000-06-15 |
| DE69907730T2 (en) | 2004-03-18 |
| ATE239875T1 (en) | 2003-05-15 |
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