EP1644644A1 - Hydraulic distributor with torque slits - Google Patents

Hydraulic distributor with torque slits

Info

Publication number
EP1644644A1
EP1644644A1 EP04767490A EP04767490A EP1644644A1 EP 1644644 A1 EP1644644 A1 EP 1644644A1 EP 04767490 A EP04767490 A EP 04767490A EP 04767490 A EP04767490 A EP 04767490A EP 1644644 A1 EP1644644 A1 EP 1644644A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
return
bore
orifice
orifices
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.)
Granted
Application number
EP04767490A
Other languages
German (de)
French (fr)
Other versions
EP1644644B1 (en
Inventor
Michel Rivolier
Armin Steinhilber
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.)
Bosch Rexroth DSI SAS
Original Assignee
Bosch Rexroth DSI SAS
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 Bosch Rexroth DSI SAS filed Critical Bosch Rexroth DSI SAS
Publication of EP1644644A1 publication Critical patent/EP1644644A1/en
Application granted granted Critical
Publication of EP1644644B1 publication Critical patent/EP1644644B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
    • F15B13/0403—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves a secondary valve member sliding within the main spool, e.g. for regeneration flow
    • 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
    • F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
    • 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
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/8667—Reciprocating valve
    • Y10T137/86694—Piston valve
    • Y10T137/86702—With internal flow passage
    • 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
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/8667—Reciprocating valve
    • Y10T137/86694—Piston valve
    • Y10T137/8671—With annular passage [e.g., spool]

Definitions

  • Hydraulic distributors comprising: a distributor body, a pressurized hydraulic fluid inlet orifice which is intended to be connected to a source of pressurized hydraulic fluid, a fluid return orifice to a reservoir, - at least two working orifices which are each intended to be connected to at least one hydraulic receiver to allow the flow and return of the fluid, - a drawer housed in a bore formed in the body and which is intended to be moved longitudinally for a selective transmission of the hydraulic fluid under pressure to the working orifices from the admission orifice, - a passage formed in the body for selectively connecting the admission orifice with the working orifices, - regulating means which are located in said passage to be interposed between the inlet port and the working ports, and which are associated with a channel of the load detection line, - a supply bridge which comprises two branches each opening into the bore of the slide, on either side of the intake orifice
  • the object of the present invention is to provide a hydraulic distributor which overcomes the aforementioned drawbacks, that is to say that it allows the control of a hydraulic receiver without jerks at start-up, and this in particular when the movement provided should be slow.
  • the hydraulic distributor of the aforementioned type is essentially characterized in that it further comprises two secondary non-return valves which are respectively mounted in the longitudinal channels, upstream of the heads of the non-return valves. main, and in that the secondary valves are connected to torque slots which open into the bore in which the drawer moves, each of these slots being connected, in at least one position of the drawer, to a branch of the bridge d 'food.
  • the secondary non-return valves are open during the phases of escaping the hydraulic fluid in the section of the slide opposite the charge pressure in the working orifice.
  • the torque slots are of circular cross section.
  • the torque slots are of oblong cross section.
  • the torque slots are of lenticular cross section.
  • the hydraulic distributor 1 shown in the figure comprises a body 2 in which are formed an orifice P for admitting a fluid under pressure, a return port T of the fluid towards a reservoir (not shown), as well as two working orifices A and B which are each intended to be connected to at least one hydraulic receiver (not shown).
  • the intake port P is in the form of a channel which passes through the body 1 transversely to the plane of the drawing and which opens onto the two main faces of the body serving as support during the stacking side by side of several distributors like the one shown in figure.
  • the orifice T consists of one or two channels passing through the body 1 transversely to the plane of the drawing.
  • the dispenser 1 also has a bore 4 which passes longitudinally through the body 1 leading to the two opposite faces 5 and 6 of this body, and in which a drawer 8 is mounted.
  • the drawer 8 is capable of sliding in this bore in a back and forth movement in the directions defined by the double arrow F.
  • the body 2 and the drawer 8 have passages and / or grooves arranged so as to cooperate in order to establish desired connections or closings orifices P, T, A and B depending on the position occupied by the drawer 8.
  • the body 2 has a supply chamber 10 which is associated with the drawer 8 and which is in permanent communication with the orifice d inlet P.
  • a supply bridge 20 is formed in the body 1 and comprises two branches 21 and 22 which respectively open into the bore 4 in which the slide 8 moves. Each of these branches is located on either side of the supply chamber 10 and of the passage 12 to be respectively selectively connected to the orifices P, A, and B.
  • the drawer 8 has internally two main non-return valves 25 and 26 which are arranged so as to be respectively interposed between the supply bridge 20 and the working orifices A and B.
  • Each of the non-return valves 25 and 26 has a movable valve head 31, 32 which are each located inside a longitudinal channel 33, 34.
  • Each of these channels 33, 34 has transverse feed slots 35, 36 which extend transversely inside the drawer 8 to open into the bore 4.
  • These feed slots 35, 36 are provided with such that, in the rest position as shown in the figure, they are closed off by the walls of the bore 4. They are selectively brought into communication with the orifices P, A or B by the displacement of the slide 8.
  • the dispenser 1 further comprises two secondary non-return valves 40 and 41 which are respectively mounted in the longitudinal channels 33, 34, upstream of the heads 31, 32 of the main non-return valves 25 and 26
  • each of the secondary valves 40 and 41 consists of a spring 42, 43 which bears on the head 31, 32 of the main valves and which urges a ball or valve head 44, 45.
  • torque slots 50, 51 extend transversely inside the drawer 8 to open into the bore 4.
  • the arrangement of these slots is adapted so that in the rest position of the drawer 8, the torque slots 50, 51 open respectively into the branches 21 and 22 of the supply bridge 20.
  • the secondary non-return valves 40 and 41 open during the hydraulic fluid exhaust phases, in the capacity opposite the load and remain closed when the pressure prevailing in the supply bridge 20 is lower than the load prevailing in A or B.
  • the slots of torque 50 and 51 can take any form suitable for the particular use of the distributor in which they are installed. They are in particular formed by transverse channels formed in the drawer and which open onto the surface of this drawer according to orifices of particular shape. In a first embodiment, the torque slots open out through orifices of circular cross section.

Abstract

The hydraulic distributor, consisting of a housing (2) with an inlet (P), a return port (T), two or more working ports (A, B), a slide valve (8) and a regulator (15), has two secondary non-return valves (40, 41) located in lengthwise channels (33, 34) upstream of the heads (31, 32) of its primary non-return valves (25, 26). The secondary non-return valves are connected via slots (50, 51) to the bore (4) containing the distributor's slide valve and are open during the hydraulic fluid escape phases in the slide valve section opposite the load pressure in the working ports.

Description

Distributeur hydraulique à fentes de couple Torque slotted hydraulic distributor
La présente invention est relative aux distributeurs hydrauliques et notamment aux distributeurs hydrauliques à répartition de débit indépendamment de la charge. On connaît des distributeurs hydrauliques comprenant : - un corps de distributeur, - un orifice d'admission de fluide hydraulique sous pression qui est destiné à être raccordé à une source de fluide hydraulique sous pression, - un orifice de retour de fluide vers un réservoir, - au moins deux orifices de travail qui sont chacun destinés à être raccordés à au moins un récepteur hydraulique pour permettre le départ et le retour du fluide, - un tiroir logé dans un alésage ménagé dans le corps et qui est destiné à être déplacé longitudinalement pour une transmission sélective du fluide hydraulique sous pression vers les orifices de travail à partir de l'orifice d'admission, - un passage ménagé dans le corps pour relier sélectivement l'orifice d'admission avec les orifices de travail, - des moyens de régulation qui sont situés dans ledit passage pour être interposés entre l'orifice d'admission et les orifices de travail, et qui sont associés à un canal de ligne de détection de charge, - un pont d'alimentation qui comprend deux branches débouchant chacune dans l'alésage du tiroir, de part et d'autre de l'orifice d'admission pour être reliées respectivement aux moyens de régulation et à l'orifice de retour de fluide, et - deux clapets anti-retour principaux qui sont portés intérieurement par le tiroir, en étant respectivement interposés entre le pont d'alimentation et les orifices de travail, et qui comprennent chacun une tête de clapet mobile dans un canal longitudinal lui-même relié à au moins une fente d'alimentation transversale qui débouche dans l'alésage. Même si de tels distributeurs hydrauliques donnent entièrement satisfaction quant à la répartition du débit de fluide hydraulique indépendamment de la pression de charge et de l'état de saturation de la pompe hydraulique, ils présentent l'inconvénient de provoquer des à-coups au moment de la mise en mouvement du ou des récepteurs reliés à ce distributeur. L'opérateur doit alors compenser ces mouvements, en fonction de son expérience, ce qui ne constitue pas une solution satisfaisante. En conséquence, la présente invention a pour but de fournir un distributeur hydraulique qui remédie aux inconvénients précités c'est-à-dire qu'il permet la commande d'un récepteur hydraulique sans à-coups au démarrage, et ce notamment lorsque le mouvement fourni doit être lent.The present invention relates to hydraulic distributors and in particular to hydraulic distributors with flow distribution independently of the load. Hydraulic distributors are known comprising: a distributor body, a pressurized hydraulic fluid inlet orifice which is intended to be connected to a source of pressurized hydraulic fluid, a fluid return orifice to a reservoir, - at least two working orifices which are each intended to be connected to at least one hydraulic receiver to allow the flow and return of the fluid, - a drawer housed in a bore formed in the body and which is intended to be moved longitudinally for a selective transmission of the hydraulic fluid under pressure to the working orifices from the admission orifice, - a passage formed in the body for selectively connecting the admission orifice with the working orifices, - regulating means which are located in said passage to be interposed between the inlet port and the working ports, and which are associated with a channel of the load detection line, - a supply bridge which comprises two branches each opening into the bore of the slide, on either side of the intake orifice to be connected respectively to the regulation means and to the fluid return orifice, and - two main non-return valves which are carried internally by the slide, being respectively interposed between the supply bridge and the working orifices, and which each comprise a movable valve head in a channel longitudinal itself connected to at least one transverse feed slot which opens into the bore. Even if such hydraulic distributors are entirely satisfactory with regard to the distribution of the flow rate of hydraulic fluid independently of the charge pressure and the state of saturation of the hydraulic pump, they have the disadvantage of causing jolts to the moment of setting in motion of the receiver (s) connected to this distributor. The operator must then compensate for these movements, based on his experience, which is not a satisfactory solution. Consequently, the object of the present invention is to provide a hydraulic distributor which overcomes the aforementioned drawbacks, that is to say that it allows the control of a hydraulic receiver without jerks at start-up, and this in particular when the movement provided should be slow.
A cet effet, selon la présente invention, le distributeur hydraulique du type précité est essentiellement caractérisé en ce qu'il comprend en outre deux clapets anti-retour secondaires qui sont respectivement montés dans les canaux longitudinaux, en amont des têtes des clapets anti-retour principaux, et en ce que les clapets secondaires sont reliés à des fentes de couple qui débouchent dans l'alésage dans lequel se déplace le tiroir, chacune de ces fentes étant reliée, dans au moins une position du tiroir, à une branche du pont d'alimentation. Ainsi, grâce à ces dispositions, l'écoulement du fluide hydraulique lors de la commande d'un récepteur est beaucoup plus progressif de sorte qu'aucun à-coups n'est ressenti. Avantageusement, les clapets anti-retour secondaires sont ouverts lors des phases d'échappement du fluide hydraulique dans le tronçon du tiroir opposé à la pression de charge dans l'orifice de travail. De manière préférée, les fentes de couple sont de section transversale circulaire. En variante, les fentes de couple sont de section transversale oblongue. Dans encore une autre variante, les fentes de couple sont de section transversale lenticulaire. De toute façon, l'invention sera bien comprise à l'aide de la description qui suit, en référence au dessin schématique annexé, représentant à titre d'exemple non limitatif, une forme de réalisation préférentielle d'un distributeur hydraulique selon la présente invention. La figure unique est une vue en coupe transversale du distributeur hydraulique selon la présente invention. Le distributeur hydraulique 1 représenté à la figure comporte un corps 2 dans lequel sont ménagés un orifice P d'admission d'un fluide sous pression, un orifice de retour T du fluide vers un réservoir (non représenté), ainsi que deux orifices de travail A et B qui sont chacun destinés à être raccordés à au moins un récepteur hydraulique (non représenté). L'orifice d'admission P se présente sous la forme d'un canal qui traverse le corps 1 transversalement au plan du dessin et qui débouche sur les deux faces principales du corps servant d'appui lors de l'empilage côte à côte de plusieurs distributeurs tels que celui représenté à la figure. De même, l'orifice T est constitué d'un ou de deux canaux traversant le corps 1 transversalement au plan du dessin. Le distributeur 1 possède en outre un alésage 4 qui traverse longitudinalement le corps 1 en débouchant sur les deux faces opposées 5 et 6 de ce corps, et dans lequel est monté un tiroir 8. Le tiroir 8 est apte à coulisser dans cet alésage dans un mouvement de va et vient selon les sens définis par la double flèche F. De façon classique, le corps 2 et le tiroir 8 comportent des passages et/ou des gorges agencés de manière à coopérer en vue d'établir des connexions ou des fermetures souhaitées des orifices P, T, A et B en fonction de la position occupée par le tiroir 8. En outre, le corps 2 possède une chambre d'alimentation 10 qui est associée au tiroir 8 et qui est en communication permanente avec l'orifice d'admission P. A proximité de cette chambre d'alimentation 10 débouche un passage 12 qui communique sélectivement avec les orifices de travail A et B en fonction du déplacement du tiroir 8 et qui possède un logement 13 dans lequel sont implantés des moyens de régulation 15 eux-mêmes associés à un canal de ligne de détection de charge 16 bien connu en soi. Par ailleurs, un pont d'alimentation 20 est ménagé dans le corps 1 et comprend deux branches 21 et 22 qui débouchent respectivement dans l'alésage 4 dans lequel se déplace le tiroir 8. Chacune de ces branches est située de part et d'autre de la chambre d'alimentation 10 et du passage 12 pour être respectivement sélectivement reliée aux orifices P, A, et B. Le tiroir 8 possède intérieurement deux clapets anti-retour principaux 25 et 26 qui sont agencés de manière à être respectivement interposés entre le pont d'alimentation 20 et les orifices de travail A et B. Chacun des clapets anti-retour 25 et 26 possède une tête de clapet mobile 31 , 32 qui sont chacune situées à l'intérieur d'un canal longitudinal 33, 34. Chacun de ces canaux 33, 34 possède des fentes d'alimentation transversales 35, 36 qui s'étendent transversalement à l'intérieur du tiroir 8 pour déboucher dans l'alésage 4. Ces fentes d'alimentation 35, 36 sont ménagées de telle manière que, en position de repos telle que représentée à la figure, elles soient obturées par les parois de l'alésage 4. Elles sont sélectivement mises en communication avec les orifices P, A ou B par le déplacement du tiroir 8. Selon une caractéristique essentielle de la présente invention, le distributeur 1 comprend en outre deux clapets anti-retour secondaires 40 et 41 qui sont respectivement montés dans les canaux longitudinaux 33, 34, en amont des têtes 31 , 32 des clapets anti-retour principaux 25 et 26. Ainsi, chacun des clapets secondaires 40 et 41 est constitué d'un ressort 42, 43 qui prend appui sur la tête 31 , 32 des clapets principaux et qui sollicite une bille ou tête de clapet 44, 45. En amont de chacune des billes, c'est-à-dire entre l'extrémité de chacun des canaux 33, 34 et les billes 44, 45, des fentes de couple 50, 51 s'étendent transversalement à l'intérieur du tiroir 8 pour déboucher dans l'alésage 4. L'agencement de ces fentes est adapté pour qu'en position de repos du tiroir 8, les fentes de couple 50, 51 débouchent respectivement dans les branches 21 et 22 du pont d'alimentation 20. Les clapets anti-retour secondaires 40 et 41 s'ouvrent lors des phases d'échappement du fluide hydraulique, dans la capacité opposée à la charge et restent fermées lorsque la pression qui règne dans le pont d'alimentation 20 est inférieure à la charge qui règne en A ou B. Les fentes de couple 50 et 51 peuvent prendre toute forme adaptée à l'utilisation particulière du distributeur dans lequel elles sont implantées. Elles sont notamment formées par des canaux transversaux ménagés dans le tiroir et qui débouchent à la surface de ce tiroir selon des orifices de forme particulière. Dans une première forme de réalisation, les fentes de couple débouchent selon des orifices de section transversale circulaire. En variante, elles peuvent être de section transversale oblongue et dans encore une autre variante, elles sont de forme transversale lenticulaire ou encore prismatique. Ces fentes de couple 50, 51 sont ouvertes ou fermées en fonction du déplacement du tiroir 8 et de l'application particulière dédiée au distributeur dans lequel elles sont montées. Comme il va de soi, l'invention ne se limite pas à la forme de réalisation préférentielle décrite ci-dessus à titre d'exemple non limitatif ; elle en embrasse au contraire toutes les variantes de réalisation dans le cadre des revendications ci-après. To this end, according to the present invention, the hydraulic distributor of the aforementioned type is essentially characterized in that it further comprises two secondary non-return valves which are respectively mounted in the longitudinal channels, upstream of the heads of the non-return valves. main, and in that the secondary valves are connected to torque slots which open into the bore in which the drawer moves, each of these slots being connected, in at least one position of the drawer, to a branch of the bridge d 'food. Thus, thanks to these provisions, the flow of hydraulic fluid when controlling a receiver is much more gradual so that no jolts are felt. Advantageously, the secondary non-return valves are open during the phases of escaping the hydraulic fluid in the section of the slide opposite the charge pressure in the working orifice. Preferably, the torque slots are of circular cross section. Alternatively, the torque slots are of oblong cross section. In yet another variant, the torque slots are of lenticular cross section. In any case, the invention will be better understood with the aid of the description which follows, with reference to the appended schematic drawing, representing by way of nonlimiting example, a preferred embodiment of a hydraulic distributor according to the present invention . The single figure is a cross-sectional view of the hydraulic distributor according to the present invention. The hydraulic distributor 1 shown in the figure comprises a body 2 in which are formed an orifice P for admitting a fluid under pressure, a return port T of the fluid towards a reservoir (not shown), as well as two working orifices A and B which are each intended to be connected to at least one hydraulic receiver (not shown). The intake port P is in the form of a channel which passes through the body 1 transversely to the plane of the drawing and which opens onto the two main faces of the body serving as support during the stacking side by side of several distributors like the one shown in figure. Similarly, the orifice T consists of one or two channels passing through the body 1 transversely to the plane of the drawing. The dispenser 1 also has a bore 4 which passes longitudinally through the body 1 leading to the two opposite faces 5 and 6 of this body, and in which a drawer 8 is mounted. The drawer 8 is capable of sliding in this bore in a back and forth movement in the directions defined by the double arrow F. Conventionally, the body 2 and the drawer 8 have passages and / or grooves arranged so as to cooperate in order to establish desired connections or closings orifices P, T, A and B depending on the position occupied by the drawer 8. In addition, the body 2 has a supply chamber 10 which is associated with the drawer 8 and which is in permanent communication with the orifice d inlet P. Near this supply chamber 10 opens a passage 12 which communicates selectively with the working orifices A and B as a function of the movement of the drawer 8 and which has a housing 13 in which means are installed regulation 15 themselves associated with a load detection line channel 16 well known per se. Furthermore, a supply bridge 20 is formed in the body 1 and comprises two branches 21 and 22 which respectively open into the bore 4 in which the slide 8 moves. Each of these branches is located on either side of the supply chamber 10 and of the passage 12 to be respectively selectively connected to the orifices P, A, and B. The drawer 8 has internally two main non-return valves 25 and 26 which are arranged so as to be respectively interposed between the supply bridge 20 and the working orifices A and B. Each of the non-return valves 25 and 26 has a movable valve head 31, 32 which are each located inside a longitudinal channel 33, 34. Each of these channels 33, 34 has transverse feed slots 35, 36 which extend transversely inside the drawer 8 to open into the bore 4. These feed slots 35, 36 are provided with such that, in the rest position as shown in the figure, they are closed off by the walls of the bore 4. They are selectively brought into communication with the orifices P, A or B by the displacement of the slide 8. According to a essential characteristic of the present invention, the dispenser 1 further comprises two secondary non-return valves 40 and 41 which are respectively mounted in the longitudinal channels 33, 34, upstream of the heads 31, 32 of the main non-return valves 25 and 26 Thus, each of the secondary valves 40 and 41 consists of a spring 42, 43 which bears on the head 31, 32 of the main valves and which urges a ball or valve head 44, 45. Upstream of each of the balls , vs that is to say between the end of each of the channels 33, 34 and the balls 44, 45, torque slots 50, 51 extend transversely inside the drawer 8 to open into the bore 4. The arrangement of these slots is adapted so that in the rest position of the drawer 8, the torque slots 50, 51 open respectively into the branches 21 and 22 of the supply bridge 20. The secondary non-return valves 40 and 41 open during the hydraulic fluid exhaust phases, in the capacity opposite the load and remain closed when the pressure prevailing in the supply bridge 20 is lower than the load prevailing in A or B. The slots of torque 50 and 51 can take any form suitable for the particular use of the distributor in which they are installed. They are in particular formed by transverse channels formed in the drawer and which open onto the surface of this drawer according to orifices of particular shape. In a first embodiment, the torque slots open out through orifices of circular cross section. As a variant, they can be of oblong cross section and in yet another variant, they are of lenticular or even prismatic cross shape. These torque slots 50, 51 are open or closed depending on the movement of the drawer 8 and the particular application dedicated to the distributor in which they are mounted. It goes without saying that the invention is not limited to the preferred embodiment described above by way of nonlimiting example; on the contrary, it embraces all of the variant embodiments thereof within the scope of the claims below.

Claims

REVENDICATIONS Distributeur hydraulique comprenant : - un corps de distributeur (2), - un orifice d'admission (P) de fluide hydraulique sous pression qui est destiné à être raccordé à une source de fluide hydraulique sous pression, - un orifice de retour (T) de fluide vers un réservoir, - au moins deux orifices de travail (A, B) qui sont chacun destinés à être raccordés à au moins un récepteur hydraulique pour permettre le départ et le retour du fluide, - un tiroir (8) logé dans un alésage (4) ménagé dans le corps (2) et qui est destiné à être déplacé longitudinalement pour une transmission sélective du fluide hydraulique sous pression vers les orifices de travail (A, B) à partir de l'orifice d'admission (P), - un passage (12) ménagé dans le corps (2) pour relier sélectivement l'orifice d'admission (P) avec les orifices de travail (A, B), - des moyens de régulation (15) qui sont situés dans ledit passage (12) pour être interposés entre l'orifice d'admission (P) et les orifices de travail (A, B), et qui sont associés à un canal de ligne de détection de charge (16), - un pont d'alimentation (20) qui comprend deux branches (21 , 22) débouchant chacune dans l'alésage (4) du tiroir (8), de part et d'autre de l'orifice d'admission (P) pour être reliées respectivement sélectivement auxdits orifices de fluide, et - deux clapets anti-retour principaux (25, 26) qui sont portés intérieurement par le tiroir (8), en étant respectivement interposés entre le pont d'alimentation (20) et les orifices de travail (A, B), et qui comprennent chacun une tête de clapet (31 , 32) mobile dans un canal longitudinal (33, 34) lui-même relié à au moins une fente d'alimentation transversale (35, 36) qui débouche dans l'alésage (4), caractérisé en ce que le distributeur (1 ) comprend en outre deux clapets antiretour secondaires (40, 41 ) qui sont respectivement montés dans les canaux longitudinaux (33, 34), en amont des têtes (31 , 32) des clapets anti-retour principaux (25, 26), et en ce que les clapets secondaires sont reliés à des fentes de couple (50, 51) qui débouchent dans l'alésage (4) dans lequel se déplace le tiroir (8), chacune de ces fentes étant reliée, dans au moins une position du tiroir (8), à une branche du pont d'alimentation (20). CLAIMS Hydraulic distributor comprising: - a distributor body (2), - an inlet orifice (P) of pressurized hydraulic fluid which is intended to be connected to a source of pressurized hydraulic fluid, - a return orifice (T ) of fluid to a reservoir, - at least two working orifices (A, B) which are each intended to be connected to at least one hydraulic receiver to allow the flow and return of the fluid, - a drawer (8) housed in a bore (4) formed in the body (2) and which is intended to be displaced longitudinally for a selective transmission of the hydraulic fluid under pressure to the working orifices (A, B) from the intake orifice (P ), - a passage (12) formed in the body (2) for selectively connecting the intake orifice (P) with the working orifices (A, B), - regulating means (15) which are located in said passage (12) to be interposed between the admission orifice on (P) and the working orifices (A, B), and which are associated with a load detection line channel (16), - a supply bridge (20) which comprises two branches (21, 22) each opening into the bore (4) of the slide (8), on either side of the intake orifice (P) to be connected selectively to said fluid orifices, and - two main non-return valves ( 25, 26) which are carried internally by the slide (8), being respectively interposed between the supply bridge (20) and the working orifices (A, B), and which each comprise a valve head (31, 32) movable in a longitudinal channel (33, 34) itself connected to at least one transverse feed slot (35, 36) which opens into the bore (4), characterized in that the distributor (1) comprises in addition two secondary non-return valves (40, 41) which are respectively mounted in the longitudinal channels (33, 34), upstream of the heads (31, 32) of the valves main non-return valve (25, 26), and in that the secondary valves are connected to torque slots (50, 51) which open into the bore (4) in which the slide (8) moves, each of these slots being connected, in at least one position of the drawer (8), to a branch of the supply bridge (20).
2. Distributeur hydraulique selon la revendication 1 , caractérisé en ce que les clapets anti-retour secondaires (40, 41 ) sont ouverts lors des phases d'échappement du fluide hydraulique dans le tronçon du tiroir (8) opposé à la pression de charge dans l'orifice de travail (A, B). 2. Hydraulic distributor according to claim 1, characterized in that the secondary non-return valves (40, 41) are open during the hydraulic fluid exhaust phases in the section of the slide (8) opposite the charge pressure in the work opening (A, B).
3. Distributeur hydraulique selon la revendication 2, caractérisé en ce que les fentes de couple (50, 51 ) sont de section transversale circulaire. 3. Hydraulic distributor according to claim 2, characterized in that the torque slots (50, 51) are of circular cross section.
4. Distributeur hydraulique selon la revendication 2, caractérisé en ce que les fentes de couple (50, 51 ) sont de section transversale oblongue. 4. Hydraulic distributor according to claim 2, characterized in that the torque slots (50, 51) are of oblong cross section.
5. Distributeur hydraulique selon la revendication 2, caractérisé en ce que les fentes de couple (50, 51 ) sont de section transversale lenticulaire. 5. Hydraulic distributor according to claim 2, characterized in that the torque slots (50, 51) are of lenticular cross section.
EP04767490A 2003-07-16 2004-06-28 Hydraulic distributor with torque slits Not-in-force EP1644644B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0308685A FR2857704B1 (en) 2003-07-16 2003-07-16 HYDRAULIC DISTRIBUTOR WITH TORQUE SLOTS
PCT/FR2004/001644 WO2005017364A1 (en) 2003-07-16 2004-06-28 Hydraulic distributor with torque slits

Publications (2)

Publication Number Publication Date
EP1644644A1 true EP1644644A1 (en) 2006-04-12
EP1644644B1 EP1644644B1 (en) 2006-11-15

Family

ID=33548179

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04767490A Not-in-force EP1644644B1 (en) 2003-07-16 2004-06-28 Hydraulic distributor with torque slits

Country Status (8)

Country Link
US (1) US7581562B2 (en)
EP (1) EP1644644B1 (en)
JP (1) JP4560515B2 (en)
CN (1) CN100389269C (en)
AT (1) ATE345446T1 (en)
DE (1) DE602004003250T2 (en)
FR (1) FR2857704B1 (en)
WO (1) WO2005017364A1 (en)

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Also Published As

Publication number Publication date
DE602004003250D1 (en) 2006-12-28
FR2857704A1 (en) 2005-01-21
EP1644644B1 (en) 2006-11-15
CN100389269C (en) 2008-05-21
WO2005017364A1 (en) 2005-02-24
DE602004003250T2 (en) 2007-04-19
FR2857704B1 (en) 2007-12-28
JP2007516388A (en) 2007-06-21
US20060137751A1 (en) 2006-06-29
CN1829864A (en) 2006-09-06
JP4560515B2 (en) 2010-10-13
ATE345446T1 (en) 2006-12-15
US7581562B2 (en) 2009-09-01

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