WO1997010457A1 - Procede et dispositif permettant de changer automatiquement les vitesses de moteurs de roulement en fonction de la charge - Google Patents

Procede et dispositif permettant de changer automatiquement les vitesses de moteurs de roulement en fonction de la charge Download PDF

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Publication number
WO1997010457A1
WO1997010457A1 PCT/EP1996/003553 EP9603553W WO9710457A1 WO 1997010457 A1 WO1997010457 A1 WO 1997010457A1 EP 9603553 W EP9603553 W EP 9603553W WO 9710457 A1 WO9710457 A1 WO 9710457A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
pressure
self
gear
holding
Prior art date
Application number
PCT/EP1996/003553
Other languages
German (de)
English (en)
Inventor
Uwe Esch
Original Assignee
O & K Mining 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
Priority claimed from DE19538416A external-priority patent/DE19538416A1/de
Application filed by O & K Mining Gmbh filed Critical O & K Mining Gmbh
Priority to AU67431/96A priority Critical patent/AU6743196A/en
Publication of WO1997010457A1 publication Critical patent/WO1997010457A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
    • F16H61/0262—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being hydraulic
    • F16H61/0265—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being hydraulic for gearshift control, e.g. control functions for performing shifting or generation of shift signals
    • F16H61/0267—Layout of hydraulic control circuits, e.g. arrangement of valves
    • F16H61/0269—Layout of hydraulic control circuits, e.g. arrangement of valves characterised by low integration or small number of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/14—Inputs being a function of torque or torque demand
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/50—Inputs being a function of the status of the machine, e.g. position of doors or safety belts
    • F16H59/54—Inputs being a function of the status of the machine, e.g. position of doors or safety belts dependent on signals from the brakes, e.g. parking brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/70—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for change-speed gearing in group arrangement, i.e. with separate change-speed gear trains arranged in series, e.g. range or overdrive-type gearing arrangements

Definitions

  • the invention relates to a method for load-dependent automatic switching of at least one multi-stage hydraulic drive motor for a mobile construction or work machine, in particular for a crawler or mobile excavator.
  • the desired driving position of the driving motor or motors can only be preselected manually. If an excavator travels downhill on a steep slope, for example, it is hydraulically supported on an associated driving brake valve until the maximum permissible pressure of a secondary safety device (e.g. pressure relief valve) is reached. If the excavator operator does not intervene and e.g. manually shifts back into first gear, the excavator drives downhill in an uncontrolled manner due to an inevitable increase in speed, which can then also lead to the destruction of the drive motor (s). In the opposite case, i.e.
  • the object of the invention is to develop a method and a device for load-dependent automatic switching of at least one hydraulic drive motor of a mobile construction or work machine in such a way that, in order to avoid damage or destruction of the drive motor (s), the switching process from second to first gear or can be brought about automatically from the first to the second gear, so that manual intervention by the excavator driver is unnecessary.
  • This goal is achieved in a method for load-dependent automatic switching of at least one multi-stage hydraulic traction motor for a mobile construction or work machine, in particular for a crawler or mobile excavator, by switching from first in the second gear or vice versa, depending on the driving pressure or the brake pressure, is carried out hydraulically.
  • the driving brake valve / valve is assigned a self-holding valve which can be acted upon by the secondary-side pressure in the area of the driving motor.
  • the driving pressure (driving uphill) or the braking pressure (driving downhill) of one or both driving motors reaches the pressure set on the self-holding valve, it switches and goes into self-holding, the driving motor (or the driving motors) then using one or more switching mechanisms valves are switched from second to first gear. If the pressure drops below the pressure required for self-holding, the self-holding valve switches back to its starting position and the driving motor (s) are switched back into second gear by means of the switching valve (s) addressed.
  • each driving motor 3, 4 is assigned a driving brake valve 5, 6, on which the respective driving motor 3, 4 is hydraulically supported in the operating state.
  • the travel brake valve 5,6 serves the purpose that the travel motor 3, 4 cannot advance in relation to the oil flow of the working pump. This ensures that the traction motor is always adequately supplied with oil.
  • the driving brake valve 5,6 is operatively connected to a secondary protection 7,8 in the form of a pressure relief valve on the one hand for the forward and on the other hand for the reverse.
  • Reference number 19 indicates the rotary feedthrough (rotor) from the upper carriage (not shown) into the region of the lower carriage (also not shown).
  • hydraulic medium is fed to the traction motors 3, 4 via the high-pressure lines 20, 21 (primary side).
  • the respective travel motor 3, 4 is supported on the travel brake valve 5, 6 already mentioned, specifically via the lines 22, 23.
  • the pressure on the secondary side in line 22 is also present via line 24 at the pressure limiting valve 8 which is responsible for driving forward.
  • a switching valve 25, 26 is provided in the hydraulic circuit diagram, which actuates the actuating mechanism 27, 28 of the associated traction motor 3, 4 in such a way that the same is switched from high to low swallowing volume or vice versa.
  • a large swallowing volume indicates a high torque that is required to start up or slow down the construction and working machine (corresponding to 1st gear). results because when driving more quickly, high torques are no longer required as when starting off.
  • a shuttle valve 29, 30 is provided in the hydraulic circuit diagram, which is connected via line 31 to high-pressure lines 20, 21. Depending on whether the hydraulic excavator is driving forwards or backwards, the shuttle valve 29, 30 is pressurized with the secondary pressure from the associated pressure side 20 or 21, in this example line 20, and opens the way to the associated switching valve 25, 26.
  • the driving brake valves 5, 6 and the pressure limiting valves 7, 8 are assigned a single self-holding valve 9.
  • the driving brake valves 5, 6 or pressure limiting valves 7, 8 are assigned a single self-holding valve 9.
  • the self-holding valve 9 is designed as a valve with a multi-stage piston 14, the pressure present in the line 33 initially acting on the smaller surface 15 of the multi-stage piston 14.
  • the multi-stage piston 14 interacts with a counter spring 16. If the pressure on the smaller surface 15 of the multi-stage piston 14 is greater than the counterforce of the spring 16, the multi-stage piston 14 is guided into a position in which the pressure is now brought to the larger piston surface 18 via line 17, whereby the valve 14 goes into self-holding and switches the drive motor (s) 3, 4 back into first gear.
  • the spring 16 remains compressed in this state, especially since it is now acted upon by the much larger force component of the piston 14 with the larger piston area. If, for example, the pressure limiting valve 8 were to open at 360 bar, the self-holding valve 14 at 350 bar, for example, would have to be brought into the state of self-retention in order to avoid damage to the driving motor (s) 3, 4. In this state, the self-holding valve 9 is switched such that the hydraulic medium supplied via a switching control line 34 is fed to the respective switching valve 25, 26 via the lines 35, 36.
  • the self-retention could then be released again, for example at 150 to 200 bar, and the process described so far could be carried out in the reverse manner, i.e. the traction motors 3, 4 would then be switched from first to second gear again.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

L'invention concerne un procédé permettant de changer automatiquement en fonction de la charge, les vitesses d'au moins un moteur de roulement hydraulique, pour engin de chantier ou engin de terrassement, notamment pour une pelle excavatrice mobile ou sur chenilles. Selon ce procédé, le processus de changement de vitesses pour passer de la première à la seconde vitesse ou inversement s'effectue hydrauliquement en fonction de la pression de roulement ou de la pression de freinage.
PCT/EP1996/003553 1995-09-11 1996-08-12 Procede et dispositif permettant de changer automatiquement les vitesses de moteurs de roulement en fonction de la charge WO1997010457A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU67431/96A AU6743196A (en) 1995-09-11 1996-08-12 Method and device for load-dependent automatic change-over of travelling motors

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19533429 1995-09-11
DE19533429.9 1995-09-11
DE19538416A DE19538416A1 (de) 1995-09-11 1995-10-16 Verfahren und Einrichtung zur lastabhängigen automatischen Umschaltung von Fahrmotoren
DE19538416.4 1995-10-16

Publications (1)

Publication Number Publication Date
WO1997010457A1 true WO1997010457A1 (fr) 1997-03-20

Family

ID=26018434

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/003553 WO1997010457A1 (fr) 1995-09-11 1996-08-12 Procede et dispositif permettant de changer automatiquement les vitesses de moteurs de roulement en fonction de la charge

Country Status (2)

Country Link
AU (1) AU6743196A (fr)
WO (1) WO1997010457A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0134408A1 (fr) * 1983-09-09 1985-03-20 Fmc Corporation Balayeuse à quatre roues à commande hydraulique
EP0407618A1 (fr) * 1989-01-27 1991-01-16 Hitachi Construction Machinery Co., Ltd. Commande de transmission hydraulique d'entrainement
WO1991005966A1 (fr) * 1989-10-17 1991-05-02 Liebherr-Werk Bischofshofen Ges.Mbh Circuit hydraulique pour limiter le couple d'un moteur hydraulique hydrostatique relie en circuit ferme a une pompe hydraulique
EP0445829A2 (fr) * 1990-03-09 1991-09-11 Shin Caterpillar Mitsubishi Ltd. Boîte de vitesse automatique
EP0511387A1 (fr) * 1990-01-18 1992-11-04 Kabushiki Kaisha Komatsu Seisakusho Systeme pour changer la vitesse de marche d'un excavateur hydraulique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0134408A1 (fr) * 1983-09-09 1985-03-20 Fmc Corporation Balayeuse à quatre roues à commande hydraulique
EP0407618A1 (fr) * 1989-01-27 1991-01-16 Hitachi Construction Machinery Co., Ltd. Commande de transmission hydraulique d'entrainement
WO1991005966A1 (fr) * 1989-10-17 1991-05-02 Liebherr-Werk Bischofshofen Ges.Mbh Circuit hydraulique pour limiter le couple d'un moteur hydraulique hydrostatique relie en circuit ferme a une pompe hydraulique
EP0511387A1 (fr) * 1990-01-18 1992-11-04 Kabushiki Kaisha Komatsu Seisakusho Systeme pour changer la vitesse de marche d'un excavateur hydraulique
EP0445829A2 (fr) * 1990-03-09 1991-09-11 Shin Caterpillar Mitsubishi Ltd. Boîte de vitesse automatique

Also Published As

Publication number Publication date
AU6743196A (en) 1997-04-01

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