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EP0764785B1 - Distributeur à tiroir avec siège de clapet étendu - Google Patents

Distributeur à tiroir avec siège de clapet étendu Download PDF

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Publication number
EP0764785B1
EP0764785B1 EP96106249A EP96106249A EP0764785B1 EP 0764785 B1 EP0764785 B1 EP 0764785B1 EP 96106249 A EP96106249 A EP 96106249A EP 96106249 A EP96106249 A EP 96106249A EP 0764785 B1 EP0764785 B1 EP 0764785B1
Authority
EP
European Patent Office
Prior art keywords
valve
longitudinal
pressure
longitudinal slide
slide
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
Application number
EP96106249A
Other languages
German (de)
English (en)
Other versions
EP0764785A2 (fr
EP0764785A3 (fr
Inventor
Hartmut Dipl.-Ing. Sandau (Fh)
Werner Dipl.-Ing. Schumacher
Rainer Dipl.-Ing. Trucksess (Fh)
Holger Dipl.-Ing. Lueues
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0764785A2 publication Critical patent/EP0764785A2/fr
Publication of EP0764785A3 publication Critical patent/EP0764785A3/fr
Application granted granted Critical
Publication of EP0764785B1 publication Critical patent/EP0764785B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/01—Locking-valves or other detent i.e. load-holding devices
    • F15B13/015—Locking-valves or other detent i.e. load-holding devices using an enclosed pilot flow valve

Definitions

  • the invention relates to a longitudinal slide valve with two in a valve housing coaxially arranged longitudinal slide the preamble of the main claim.
  • DE 41 40 604 A1 describes a longitudinal slide valve with two in a valve housing coaxially arranged longitudinal slide known.
  • the first of the two longitudinal slides guides the pressure medium flow between a return port and at least one Consumer connection.
  • the second longitudinal slide the one in the first stored and guided in the center, becomes a hydraulic one if necessary Opening of the first longitudinal slide controlled electromagnetically. This branches off from the consumer connection Pressure medium primarily in front of an end face of the first longitudinal slide redirected while a pressure chamber in front of the other end hydraulically in the locked position with the consumer connection in Connection is established.
  • the diameter of the valve seat corresponds to the diameter of the fine control region connected downstream.
  • the sealing surface between the valve seat and valve cone is a very narrow ring surface, so that there is almost line contact between the valve seat and valve cone. This prevents that when opening the longitudinal slide at still. closed fine control area exerts an axial force which interferes with the valve control behavior on the longitudinal slide due to pressure medium flowing in between the valve seat and the fine control area. Due to the narrow sealing surface, the surface pressure in the sealing zone is very high. Consequently, the first longitudinal slide must be stored in a hardened and ground steel sleeve embedded in the valve housing.
  • the mean diameter of the Seat of this longitudinal slide is designed larger than that maximum diameter of the subordinate in the closing direction Fine control range. Thanks to the graduated design of the longitudinal slide and corresponding guide and seat hole can with the longitudinal slide between the mainly cylindrical Fine control area and the management area The collar should be laid out over a large area.
  • the Surface pressure adapted to the unhardened used Materials, a fraction of the maximum permissible compressive stress stay.
  • the bore leading the longitudinal slide can including the fine control area with a step reamer to be edited.
  • the valve housing can do less complex - that means also cheaper - to be manufactured.
  • the cost advantage also results from constructions such as a guide sleeve due to the flow channel need, since here a hardening of the sleeve and the subsequent Finishing by internal grinding is not necessary.
  • the fine control area has one relatively large positive coverage.
  • the proportional directional valve element (120) shown in FIG. is a throttling 2/2-way valve, the longitudinal spool (140, 147) In addition to the two end positions, any intermediate positions are infinitely variable can take. It has on its left side a proportional magnet (121).
  • the 2/2-way valve controls, for example, that of the single-acting one Hydraulic cylinder returning to the tank under load Pressure medium flow. Therefore, it is called the sink module. It is designed as a poppet valve and also works as a the load-protecting check valve. To lower a load the proportional magnet (121) of the sink module (120) is activated. The pressure medium overflows from the consumer connection (50) the sink module (120) to the return connection (52).
  • the proportional directional control valve element is essentially cuboid - Here shown in simplified form - valve housing (30) with two approximately square, flat outer surfaces, the top and bottom parallel to the cutting plane are aligned. There are mounting holes in the cutting plane (69, 69 ') can be seen perpendicular to the top and bottom penetrate the valve housing (30).
  • the side surfaces aligned perpendicular to the cut surface (34, 35, 38, 39) each have a rectangular outline.
  • the front (34) and the back (35) are flat surfaces.
  • On the proportional magnet (121) is flanged to the front. Opposite him sits in the back (35) in a depression a screw plug (157) for a longitudinal slide (140) receiving bore (44).
  • the two other side surfaces (38) and (39) each have an internally threaded recess, the lower the return connection (52) and the upper one the consumer connection (50).
  • the proportional directional control valve (120) has a valve housing (30) traversing stepped bore (44). It is on the left by the proportional magnet (121) and on the right by a Hexagon socket screw plug (157) pressure-tight locked.
  • the first or outer longitudinal slide (140) guided and stored.
  • the cylindrical bore part goes into the guide area a consumer ring channel (125).
  • the latter stands with the Consumer connection (50) hydraulically directly connected.
  • An adjusting screw is located in the left area of the stepped bore (44) (150) in an internal thread (128). Nearly between the adjusting screw (150) and the outer longitudinal slide (140) a return ring channel (126) is arranged in the the return connection (52) opens.
  • the adjusting screw (150) is arranged on it with the exception of one Toothing (151) known from DE 41 40 604 A1.
  • the sink module (120) is shown in the locked position.
  • the Pressure medium on the consumer connection (50) and thus on the consumer ring channel (125) is not in the return ring channel (126) flow.
  • the fine control area (141a) arranged.
  • the latter is from the main valve cone by means of a constriction (141b) with an approximately trapezoidal single cross section Cut.
  • the constriction serves among other things favorable flow control and machining ease for the main valve poppet (141).
  • the cylinder seat (133) lies with its diameter D F below the average diameter D S of the adjacent sealing surface of the main valve seat (132). Since the stepped bore (44), in particular the bearing and sealing surfaces, are to be machined from the rear of the housing (35) with only one tool, the smallest diameter of the sealing surface of the main valve seat (132) is the same size or larger than the diameter D F of the cylinder seat (133).
  • the pressure medium comes from the consumer ring channel to the right end (125) via a radial in the main control spool (140) throttle bore (144) and an adjoining one Longitudinal bore (145).
  • the longitudinal bore (145) penetrates in A control groove (143) in the area of the bottom of the hole.
  • the sink module (120) opens when the proportional solenoid is energized (121). Its anchor plunger (122) pushes the inner one Longitudinal spool, a pilot spool (147) slightly behind right. As a result, his input tax notches (149) get under the Control groove (143) of the main control spool (140). At the same time lifts his valve cone (148) further left from his in the main control slide (140) corresponding valve seat (146). The pressure chamber (135) is now over the longitudinal bore (145), the tax groove (143), the input tax notches (149), the Valve seat (146) and the return ring channel (126) with the return connection (52) in connection. Depending on the opening cross-section the pilot control notch (149) the pressure in the pressure chamber drops (135). The pressure there arises according to the ratio the cross section of the throttle bore (144) and the opening cross section the pilot notches (149).
  • the main valve plug (141) lifts off from the main valve seat (132). With the main control notches (142) still closed, the oil pressure-loaded annular surface in the sealing zone, in the area between the consumer ring channel (125) and the annular space (134), thus increases to its maximum.
  • the ring area is now limited by the diameters D F and D. Consequently, the main control spool (140) makes a small jerky stroke to the right. Only after this stroke do the fine-control main control notches (142) reach the area of the annular space (134).
  • the pressure medium now flows along, coming from the consumer the main control spool (140) towards the return ring channel (126).
  • the main control slide (140) hurries through its opening movement the pilot spool (147), whereby the Opening cross section on the pilot notches (149) becomes smaller. This can be in the pressure chamber (135) via the throttle bore (144) Build up a higher pressure. Consequently the opening movement of the main control spool (140) braked until sets a state of equilibrium.
  • the anchor plunger (122) moves to the left, it follows due to a return spring integrated in the adjusting screw (150) (155) the pilot spool (147).
  • the return spring (155) is supported on the pilot spool (147) and on the Adjusting screw (150).
  • the pilot control notches (149) are closed.
  • the Pressure in the pressure chamber (135) increases.
  • the main poppet (141) puts on the main valve seat (132).
  • the sink module (120) locks.
  • the proportional directional valve element (120) thus works like a sequential control.
  • the Adjusting screw can be adjusted using an adjusting spindle free end protrudes from the valve housing (30), or a special tool, sometimes at the front with the adjusting screw can be coupled, set in rotation.
  • the length of the adjustment range largely corresponds to the width of the toothing (151) Adjustment screw (150).
  • the surface pressure in the contact area forming the pressure surface between the valve cone (141) and the corresponding valve seat (132) can be below 150 N / mm 2 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetically Actuated Valves (AREA)
  • Sliding Valves (AREA)
  • Multiple-Way Valves (AREA)

Claims (2)

  1. Soupape à tiroir longitudinal comprenant, montés coaxiaux dans un boítier de soupape (30) deux tiroirs longitudinaux (140, 147) cylindriques dans certaines zones, dont le premier (140) conduit le débit d'agent de pression entre au moins un raccord d'utilisateur (50) et au moins un raccord de retour (52), le long de son cône de soupape (141) et de sa zone de commande de précision (141a), tandis que le second tiroir (147), logé et guidé dans le premier, sous l'effet d'une commande électromagnétique, quand cela est nécessaire au mouvement d'ouverture du premier tiroir (140) fait passer de l'agent de pression dérivé du raccord d'utilisateur (50), devant au moins une des faces latérales du premier tiroir, une chambre de pression (135) située devant une face latérale du premier tiroir (140) étant en liaison hydraulique avec le raccord d'utilisateur (50) quand la soupape est en position d'arrêt,
    caractérisée en ce que
    le diamètre moyen Ds de la portée d'étanchéité, en forme de cône, du cône de soupape (141) du premier tiroir longitudinal (140) est supérieur au diamètre maximal DF de la zone de commande de précision (141a) située en aval, et
    la couverture positive de la zone de commande de précision (141a) est supérieure à la course d'ouverture par recul du premier tiroir longitudinal (140) quand le cône de soupape (141) se soulève de son siège de soupape (132).
  2. Soupape selon la revendication 1,
    caractérisée en ce que
    la pression superficielle dans la zone de contact constituant la portée d'étanchéité entre le cône de soupape (141) et le siège de soupape (132) correspondant est inférieure à 150 N/mm2.
EP96106249A 1995-09-22 1996-04-20 Distributeur à tiroir avec siège de clapet étendu Expired - Lifetime EP0764785B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19535223A DE19535223A1 (de) 1995-09-22 1995-09-22 Längsschieberventil mit großflächigem Ventilsitz
DE19535223 1995-09-22

Publications (3)

Publication Number Publication Date
EP0764785A2 EP0764785A2 (fr) 1997-03-26
EP0764785A3 EP0764785A3 (fr) 1998-06-03
EP0764785B1 true EP0764785B1 (fr) 2001-11-28

Family

ID=7772862

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96106249A Expired - Lifetime EP0764785B1 (fr) 1995-09-22 1996-04-20 Distributeur à tiroir avec siège de clapet étendu

Country Status (2)

Country Link
EP (1) EP0764785B1 (fr)
DE (2) DE19535223A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1128109A1 (fr) 2000-02-22 2001-08-29 Siemens Building Technologies AG Vanne pour dispositif de commande
EP1611358B1 (fr) * 2003-04-10 2007-10-24 Bosch Rexroth AG Soupape de distribution a variation continue
RU2334906C1 (ru) * 2006-12-26 2008-09-27 Валерий Владимирович Бодров Запорно-регулирующий клапан
RU2552211C1 (ru) * 2014-05-05 2015-06-10 Валерий Владимирович Бодров Запорно-регулирующий клапан
RU2766379C1 (ru) * 2021-07-12 2022-03-15 Артур Олегович Бурков Предохранительное устройство непрямого действия для гидросистем

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4140604A1 (de) * 1991-12-10 1993-06-17 Bosch Gmbh Robert Steuervorrichtung fuer den volumenstrom eines hydraulischen arbeitsmittels

Also Published As

Publication number Publication date
EP0764785A2 (fr) 1997-03-26
DE59608303D1 (de) 2002-01-10
EP0764785A3 (fr) 1998-06-03
DE19535223A1 (de) 1997-03-27

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