EP0751302A2 - Système d'encliquetage électrohydraulique pour un distributeur - Google Patents

Système d'encliquetage électrohydraulique pour un distributeur Download PDF

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Publication number
EP0751302A2
EP0751302A2 EP96100141A EP96100141A EP0751302A2 EP 0751302 A2 EP0751302 A2 EP 0751302A2 EP 96100141 A EP96100141 A EP 96100141A EP 96100141 A EP96100141 A EP 96100141A EP 0751302 A2 EP0751302 A2 EP 0751302A2
Authority
EP
European Patent Office
Prior art keywords
locking
latching
valve
switching
longitudinal 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.)
Granted
Application number
EP96100141A
Other languages
German (de)
English (en)
Other versions
EP0751302B1 (fr
EP0751302A3 (fr
Inventor
Wolfgang Dipl.-Ing. Koetter
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 EP0751302A2 publication Critical patent/EP0751302A2/fr
Publication of EP0751302A3 publication Critical patent/EP0751302A3/fr
Application granted granted Critical
Publication of EP0751302B1 publication Critical patent/EP0751302B1/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

Definitions

  • the invention is based on an electro-hydraulic locking system according to the preamble of the main claim.
  • a hydraulic valve provided with a locking mechanism is known from EP 0 394 860 B1.
  • the valve has a longitudinal slide, on and in one end of which a multiple locking mechanism with radially locking locking balls is arranged.
  • the locking balls sit in radial bores which lie in a cross-sectional plane of the tubular end of the longitudinal slide.
  • the locking recesses are located in the valve housing.
  • a spring-centered locking piston is arranged in the tubular end of the longitudinal slide and can be pressurized with hydraulic oil on the back.
  • the locking piston has a groove for receiving the locking ball.
  • the groove has a phase towards the back. With the help of the wedge effect of the phase, the locking balls can be pressed radially outwards to lock them in a housing groove.
  • a latching control valve which can be operated by an operator and via which the hydraulic oil pressure can be controlled by means of a rotary knob in such a way that either the latching is switched on or off, or the latching is released when the pressure is too high.
  • the latching system according to the invention should have a modular structure, so that it can be combined with certain working valve series and their variants.
  • the locking system should have all control, switching and sensor elements that require one or more locking units.
  • different latching conditions should be selectable at least for all flow positions of the working valve to be latched, the latching state also being able to be changed during operation of the working valve.
  • the latching system should be designed in such a way that it is possible to take into account additional boundary conditions for latching individual switching positions without having to modify the working valve directly.
  • the locking unit (s) loaded with pressure medium should also have a low pressure medium consumption.
  • the latching system in accordance with the characterizing features of the first claim, consists of several individual elements and / or assemblies, the majority of which are arranged directly on the working valve. These are, for example, the individual latching units and the sensor or sensors for recognizing the individual switching positions of the valve spool.
  • the latching elements of the latching units scan a latch contour attached to the longitudinal slide.
  • the scanning can be carried out, among other things. done both radially or axially.
  • at least one locking element is provided for each switching position.
  • the sensors for detecting the individual switching positions of the longitudinal slide are mechanical, optical, inductive or magnetic scanning systems. All scanning systems emit signals that can be evaluated electrically in accordance with the respective switching position.
  • These signals are used together with the signals from electrical operating elements in the form of switches and possibly pressure sensors in order to electrically control at least one auxiliary valve for the pressure medium loading of a latching unit.
  • An embodiment of a locking unit according to VDI 2253 is a locking mechanism with double-sided locking direction and variable holding force with combined positive and non-positive locking.
  • the locking mechanism is designed, for example, as a radial single lock.
  • the latching spring loading the latching element or the blocker can be tensioned with the aid of a pressure medium piston. With pure spring loading, the latching unit has a low residual holding force that can be overcome by operating the manual valve.
  • the characteristics of the further subclaims relate to on the design of the module for detecting the slide position of the working valve and the arrangement and connection of controlling pressure sensors.
  • the latching system described here it is possible to implement a separation of functions in the area of the valves with latches.
  • the hydraulic or pneumatic function of the working valve is clearly separated from the desired locking function for certain switching positions of the valve spool.
  • the individual components and elements of the locking system are independent functional units, which are primarily electrically connected to one another and can easily be attached to the work valves provided for this purpose. This makes it possible to lock a wide variety of work valves.
  • the switches or control elements for locking and unlocking can be attached to any desired switching position at any location thanks to the electrical connection.
  • An indication of the latching states and, if applicable, the pressure values is not spatially linked to the working valve. You can also use it to control the locking units additional external switches are provided.
  • the locking unit which is pressurized by pressure of pressure medium, only needs as much pressure medium as is necessary to tension the corresponding locking element.
  • a working valve a 5/4-way valve (10) is shown.
  • the working valve (10) is used here to control a double-acting cylinder (1). It also has a longitudinal slide that allows four switching positions in its valve housing.
  • the valve housing is connected to the cylinder (1) on the consumer side via the working connections (A, B) and the working lines (3, 4), while on the other side it is connected to at least one pressure medium line (80) and one return line (81) is.
  • the freewheel position "F” is arranged.
  • the working lines (3, 4) are jointly relieved into the return line (81) via this switch position.
  • the pressure medium line (80) is blocked at the same time.
  • the 5/4-way valve (10) has a control connection (Y) with a control or signal line (82) connected to it, via which, for example in flow positions "1" and “2", the working pressure or in the free-running position "F" and the blocking zero position "0" the return pressure can be measured.
  • the longitudinal slide is held or centered in its zero locked position "0" by means of return springs (18) and (19) resting on the two longitudinal slide ends.
  • the longitudinal slide has, for example, a manual actuating device (11), as is arranged here on the right side of the longitudinal slide.
  • a switching contour (12) is attached to the longitudinal slide in the area of the actuating device.
  • the switching contour (12) is scanned, for example, with the aid of a roller plunger (61) which actuates an electrical switch (60).
  • the switching contour (12) shown symbolically has three switching levels.
  • the average level at which the roller tappet (61) according to FIG. 1 currently rests corresponds to the blocking zero position.
  • the level located lower on the switching contour (12) to the right of the middle level is used for electrical detection of the flow position "1", while the highest level detects the flow position "2" via the switch (60).
  • the roller tappet (61) scans the second middle level, to the left of the highest level, in the freewheel position.
  • notch bar (14) with three notches (15, 16) and (17) at the other end of the longitudinal slide.
  • Two latching units (30) and (40) are arranged in the area of the catch bar.
  • the latching unit (40) comprises a housing in which the latching element (41) is mounted so as to be longitudinally displaceable.
  • a helical spring (42) supported in the housing presses the locking element against the locking bar (14).
  • the actuating device (11) must be operated here or the longitudinal slide must be moved.
  • the locking notches (15) and (16) located on the top of the locking bar interact with the locking unit (30) to lock the longitudinal slide in the flow positions "1" and “2".
  • a spring-loaded locking element (31) engages in the respective locking notch (15) or (16).
  • the locking element (31) is supported by a helical spring (32) on a piston (33) which can be pressurized with pressure medium on the rear.
  • the piston (33) is located together with the latching element (31) and the coil spring (32) in a housing (34) that is comparable to a stepped cylinder.
  • the housing (34) is designed as a pressure medium cylinder (35). It contains the pressure medium space (36). The latter has a larger diameter than the housing (34) in the region of the latching element (31). As a result, the stroke of the piston (33) can be limited to the length of the pressure medium space (36).
  • the pressure medium cylinder (35) is connected to a 3/2-way valve (50) via a hydraulic line (88).
  • This auxiliary or connecting valve (50) is actuated by means of an electromagnet (51) which acts against the force of a return spring (52).
  • the pressure medium space (36) is relieved in the lines (87) and (88).
  • a pressure medium line (86) leading to the valve (50) is blocked.
  • the longitudinal slide of the 5/4-way valve (10) must be in the area of one of the two flow positions "1" or "2" and the pressure medium pressure must be above a minimum pressure and possibly below a maximum pressure.
  • the minimum pressure medium pressure is measured with the aid of a pressure sensor (66) which is located in the pressure medium line (80) before the branch to the pressure medium line (86).
  • the actuator (68) and the switch (77) is arranged in Figure 2 between the electromagnetic actuator (51) and the switch (60).
  • a further pressure sensor (67) for the maximum pressure medium pressure is arranged in the pressure medium line (80).
  • the latching must be preselected individually for each of the two flow positions using, for example, manually operated switches (71) and (72).
  • each switch (71) or (72) is followed by a changeover switch (73) or (74) in series, with which a maximum pressure-dependent unlatching can be activated.
  • a maximum pressure switch with switching delay (75) or (76) is installed in the respective line section for maximum pressure-dependent unlatching. Both maximum pressure switches are actuated here by a pressure and time-controlled actuator (69).
  • the maximum pressure-dependent unlatching enables the latching unit (30) to be unlocked in the event of an unintended load-side pressure increase, for example. With the help of the time-delayed response of the maximum pressure switches (75) and (76), accidental unlocking due to short, high pressure peaks can be avoided.
  • the 5/4-way valve (10) is in a continuous position and at least one latching switch (71, 72) is actuated, the electromagnetic actuating element (51) of the 3/2-way valve (50 ) energized.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Preventing Unauthorised Actuation Of Valves (AREA)
  • Fluid-Driven Valves (AREA)
EP96100141A 1995-06-28 1996-01-08 Système d'encliquetage électrohydraulique pour un distributeur Expired - Lifetime EP0751302B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19523456A DE19523456A1 (de) 1995-06-28 1995-06-28 Elektrohydraulisches Verrastungssystem für ein Wegeventil
DE19523456 1995-06-28

Publications (3)

Publication Number Publication Date
EP0751302A2 true EP0751302A2 (fr) 1997-01-02
EP0751302A3 EP0751302A3 (fr) 1999-04-28
EP0751302B1 EP0751302B1 (fr) 2003-04-09

Family

ID=7765439

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96100141A Expired - Lifetime EP0751302B1 (fr) 1995-06-28 1996-01-08 Système d'encliquetage électrohydraulique pour un distributeur

Country Status (2)

Country Link
EP (1) EP0751302B1 (fr)
DE (2) DE19523456A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009042143A1 (fr) * 2007-09-24 2009-04-02 Clark Equipment Company Système de régulation de débit hydraulique auxiliaire pour un petit chargeur
CN108167511A (zh) * 2018-02-12 2018-06-15 无锡智能自控工程股份有限公司 远程集中操作液压手动机构
CN108980233A (zh) * 2018-09-20 2018-12-11 岭南师范学院 一种电液控制式机械轮体锁止机构

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19858482A1 (de) * 1998-12-18 2000-06-29 Mannesmann Rexroth Ag Hydraulisches Ventil, insbesondere hydraulisches Wege-Sitzventil
DE102012208943A1 (de) 2012-05-29 2013-12-05 Robert Bosch Gmbh Rastvorrichtung für ein Schieberventil
DE102016202304B4 (de) 2016-02-16 2025-10-30 Robert Bosch Gmbh Wegeventil mit elektromagnetisch betätigter Rastung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4195551A (en) * 1977-06-23 1980-04-01 Gresen Manufacturing Company Hydraulic control valve including electromagnetic detent
DE3125482A1 (de) * 1981-06-29 1983-01-13 Günter Till Präzisionsmechanik, 3330 Helmstedt "steuerschieber"
DE3801072C1 (fr) * 1988-01-15 1989-06-15 Mannesmann Rexroth Gmbh, 8770 Lohr, De

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009042143A1 (fr) * 2007-09-24 2009-04-02 Clark Equipment Company Système de régulation de débit hydraulique auxiliaire pour un petit chargeur
US8109356B2 (en) 2007-09-24 2012-02-07 Clark Equipment Company Auxiliary hydraulic flow control system for a small loader
CN108167511A (zh) * 2018-02-12 2018-06-15 无锡智能自控工程股份有限公司 远程集中操作液压手动机构
CN108980233A (zh) * 2018-09-20 2018-12-11 岭南师范学院 一种电液控制式机械轮体锁止机构

Also Published As

Publication number Publication date
DE19523456A1 (de) 1997-01-02
EP0751302B1 (fr) 2003-04-09
EP0751302A3 (fr) 1999-04-28
DE59610323D1 (de) 2003-05-15

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