EP1137888B1 - Distributeur hydraulique - Google Patents

Distributeur hydraulique Download PDF

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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
Application number
EP99957372A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1137888A1 (fr
Inventor
Wolfgang Kauss
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 SAS
Original Assignee
Mannesmann Rexroth SA
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 Mannesmann Rexroth SA filed Critical Mannesmann Rexroth SA
Publication of EP1137888A1 publication Critical patent/EP1137888A1/fr
Application granted granted Critical
Publication of EP1137888B1 publication Critical patent/EP1137888B1/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
    • F15B13/02—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
    • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Multiple-Way Valves (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Valve Device For Special Equipments (AREA)
  • Servomotors (AREA)
  • Safety Valves (AREA)
  • Arrangement And Driving Of Transmission Devices (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Magnetically Actuated Valves (AREA)
  • Fuel-Injection Apparatus (AREA)
EP99957372A 1998-12-09 1999-12-08 Distributeur hydraulique Expired - Lifetime EP1137888B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9815523A FR2787148B1 (fr) 1998-12-09 1998-12-09 Distributeur hydraulique
FR9815523 1998-12-09
PCT/FR1999/003052 WO2000034665A1 (fr) 1998-12-09 1999-12-08 Distributeur hydraulique

Publications (2)

Publication Number Publication Date
EP1137888A1 EP1137888A1 (fr) 2001-10-04
EP1137888B1 true EP1137888B1 (fr) 2003-05-07

Family

ID=9533755

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99957372A Expired - Lifetime EP1137888B1 (fr) 1998-12-09 1999-12-08 Distributeur hydraulique

Country Status (7)

Country Link
US (1) US6532989B1 (enExample)
EP (1) EP1137888B1 (enExample)
JP (1) JP4603166B2 (enExample)
AT (1) ATE239875T1 (enExample)
DE (1) DE69907730T2 (enExample)
FR (1) FR2787148B1 (enExample)
WO (1) WO2000034665A1 (enExample)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10219717B3 (de) * 2002-05-02 2004-02-05 Sauer-Danfoss (Nordborg) A/S Hydraulische Ventilanordnung
DE10325296A1 (de) * 2003-06-04 2004-12-23 Bosch Rexroth Ag Hydraulische Steueranordnung
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 (ja) * 2008-02-28 2012-07-25 カヤバ工業株式会社 ロードセンシングバルブ
IT1395462B1 (it) * 2009-09-03 2012-09-21 Brevini Fluid Power S P A Valvola di distribuzione
KR101115355B1 (ko) 2011-11-15 2012-03-06 주식회사 에스엔티 유압조절 밸브장치
EP2980416B1 (en) * 2014-07-31 2019-06-05 Bucher Hydraulics S.p.A. Hydraulic section for load sensing applications and multiple hydraulic distributor
JP6314903B2 (ja) * 2015-05-08 2018-04-25 Smc株式会社 流路ユニット及び切換弁
CN108869434B (zh) * 2018-09-21 2019-11-26 浙江达柏林阀门有限公司 一种平衡阀

Family Cites Families (6)

* Cited by examiner, † Cited by third party
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 (ja) * 1988-11-10 1995-09-20 株式会社ゼクセル 油圧制御弁
JP2740223B2 (ja) * 1989-01-09 1998-04-15 日立建機株式会社 弁装置
JPH0758082B2 (ja) * 1990-06-22 1995-06-21 株式会社ゼクセル 油圧制御弁装置
FR2689575B1 (fr) 1992-04-06 1994-07-08 Rexroth Sigma Distributeur hydraulique a compensation de pression et une selection de pression maximale pour piloter une pompe et commande hydraulique multiple incluant de tels distributeurs.
US5791142A (en) * 1997-03-27 1998-08-11 Husco International, Inc. Hydraulic control valve system with split pressure compensator

Also Published As

Publication number Publication date
FR2787148A1 (fr) 2000-06-16
FR2787148B1 (fr) 2001-02-16
JP4603166B2 (ja) 2010-12-22
US6532989B1 (en) 2003-03-18
JP2002531793A (ja) 2002-09-24
ATE239875T1 (de) 2003-05-15
WO2000034665A1 (fr) 2000-06-15
DE69907730T2 (de) 2004-03-18
EP1137888A1 (fr) 2001-10-04
DE69907730D1 (de) 2003-06-12

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