EP1293669B1 - Pompe de direction hydraulique entraînée par moteur à combustion - Google Patents

Pompe de direction hydraulique entraînée par moteur à combustion Download PDF

Info

Publication number
EP1293669B1
EP1293669B1 EP20020019785 EP02019785A EP1293669B1 EP 1293669 B1 EP1293669 B1 EP 1293669B1 EP 20020019785 EP20020019785 EP 20020019785 EP 02019785 A EP02019785 A EP 02019785A EP 1293669 B1 EP1293669 B1 EP 1293669B1
Authority
EP
European Patent Office
Prior art keywords
steering
pressure
pump
steering pump
working machine
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
EP20020019785
Other languages
German (de)
English (en)
Other versions
EP1293669A3 (fr
EP1293669A2 (fr
Inventor
Ottmar Neuf
Rainer Dr. Bavendiek
Recep Macit
Jörg HÜBNER
Stefan Bauer
Berndt Hoffmockel
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.)
STILL GmbH
Original Assignee
STILL 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 STILL GmbH filed Critical STILL GmbH
Publication of EP1293669A2 publication Critical patent/EP1293669A2/fr
Publication of EP1293669A3 publication Critical patent/EP1293669A3/fr
Application granted granted Critical
Publication of EP1293669B1 publication Critical patent/EP1293669B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/05—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by internal-combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs

Definitions

  • the invention relates to a mobile working machine, in particular industrial truck, with an internal combustion engine and a hydraulic steering pump driven therefrom for supplying a steering actuator.
  • the supply of the steering system of internal combustion engine-powered forklifts with hydraulic energy is performed by a steering pump whose delivery volume is measured at the lower idle speed of the internal combustion engine. At this speed, the steering pump already promotes sufficient pressure fluid to supply the steering actuator so far that a minimum steering speed is achieved. Due to the principle, this leads to large-volume steering pumps, which have a high torque requirement. With increasing operating speed of the engine considerable energy losses occur because more pressure medium is conveyed by the steering pump than the steering actuator needed. In forklifts, in which the hydraulic pump supplies not only the steering cylinder but also a working hydraulics (priority valve switching), the entire pressure medium, including the quantity required for the working hydraulics, is always pressurized. This too leads to energy losses and to heating of the entire hydraulic system.
  • the present invention is based on the object to provide a mobile machine of the type mentioned above, in which the energy losses caused by the steering system are minimized.
  • a hydraulic accumulator is connected to the steering pump and the steering actuator and that the specific delivery volume of the steering pump is so dimensioned that the operation of the steering actuator at low operating speeds of the internal combustion engine, the injection of pressure medium from the steering pump and the memory requires and when a threshold speed is exceeded, the operation of the steering cylinder by solely feeding pressure medium from the steering pump is possible.
  • the idea essential to the invention is therefore to significantly reduce the specific delivery volume of the steering pump, so the delivery volume per revolution and compensate to provide a sufficiently large memory that is loaded by the steering pump and from the operating conditions in certain, namely at low operating speeds of Internal combustion engine, in addition to the steering pump pressure medium is fed into the steering actuator.
  • the delivery volume of the steering pump can be halved or even divided into three. This reduces the energy losses and the torque requirement of the steering pump to the same extent.
  • the steering pump is smaller and requires less space in the machine.
  • the torque demand on the internal combustion engine is reduced especially in the range of low operating speeds, which allows the use of small-sized turbo engines, which are rather weak in torque especially in this operating range. Overall, the energy losses in the steering circuit are significantly reduced.
  • the volume of the memory is so dimensioned that with sole supply of the steering actuator by pressure medium from the full memory multiple actuation of the steering actuator from stop to stop is possible.
  • a Notenergypump the steering actuator is ensured in case of failure of the engine or the steering pump. It requires no additional effort of the driver of the machine to use the emergency power supply.
  • a pressure sensor in the memory directly or indirectly detected pressure sensor is provided, which is in operative connection with a brake system of the machine, which falls below a pressure limit, a positively controlled braking operation can be triggered. With pressure loss in the steering circuit, the working machine is thus brought into a safe state.
  • the threshold speed of the internal combustion engine is advantageously in the range of the average operating speeds.
  • the volumetric flow provided by the steering pump (product of specific delivery volume and rotational speed of the internal combustion engine) is sufficient to supply the steering actuator without the use of the accumulator.
  • the specific delivery volume of the steering pump is measured, for example, in the case of a forklift after the flow, the steering actuator at a
  • the steering pump can be designed as a fixed displacement pump, which is followed by a pressure-controlled, between two switching positions pressure compensator, wherein the steering pump in the first switching position of the pressure compensator with the steering actuator and in the second switching position connected to a tank.
  • the steering pump is designed as a variable displacement pump.
  • a demand flow control of the variable displacement pump enables the minimization of circulation losses.
  • a working hydraulics with upstream control valve assembly is connected to the steering pump and the steering actuator, under certain conditions, energy from the working hydraulics can be fed into the steering hydraulics.
  • energy from the working hydraulics can be fed into the steering hydraulics.
  • a forklift it is possible to use potential energy of the height-adjustable load carrier and / or the load to load the accumulator and / or actuate the steering actuator.
  • the mobile work machine according to the invention can be designed for example as a forklift.
  • An internal combustion engine 1 drives a steering pump 2, whose delivery line 3 is connected to a recordable as a steering cylinder hydraulic steering actuator 4, which is actuated by an upstream steering control valve 5.
  • a reservoir 7 Downstream of a check valve 6 opening in the direction of the steering actuator 4, a reservoir 7 is connected to the delivery line 3 and thus to the steering pump 2 and to the steering actuator 4.
  • the circuit is supplemented by a pressure relief valve 8 and a filter 9 at the output of the steering pump 2.
  • a pressure sensor 10 is provided which measures the pressure in the delivery line 3 downstream of the check valve 6 and thus also the pressure in the memory 7.
  • the pressure sensor 10 is in operative connection with a brake system, not shown in the figures of the machine.
  • the specific delivery volume of the steering pump 2, so the delivery volume per revolution, is dimensioned so that the operation of the steering actuator 4 below a certain threshold speed of the engine 1 only by parallel injection of pressure fluid from both the steering pump 2 and from the memory 7.
  • the memory 7 is charged by the steering pump 2 in this operating condition.
  • the steering pump 2 Upon reaching the threshold speed, the steering pump 2 promotes a volume flow sufficient to feed the steering actuator 4 without pressure medium from the memory 7. At higher operating speeds (above the threshold speed) 2 more pressure medium is funded by the steering pump than necessary for the actuation of the steering actuator 4. The excess pressure medium loads the memory 7 or is discharged via the pressure relief valve 8 in the tank.
  • the pressure signal detected by the pressure sensor 10 triggers an emergency braking of the working machine in order to ensure that no dangerous driving conditions occur.
  • the steering pump 2 designed as a fixed-displacement pump is followed by a pressure compensator 11, which is controlled by the pressure in the delivery line 3 is movable between two switching positions.
  • the steering pump 2 is connected in the first switching position with the steering actuator 4 and in the second switching position with a tank T.
  • the losses are reduced when the steering actuator 4 is not actuated.
  • the pump is always set to the lowest possible delivery volume.
  • FIG. 3 shows an embodiment of the invention in which, downstream of the check valve 6, a line 12 branches off from the delivery line 3 and leads to a cylinder of a working hydraulic system 13. This may be, for example, the lifting cylinder of a forklift.
  • the working hydraulics 13 is preceded by a control valve assembly 14. With this variant of the invention it is in principle possible to use energy from the working hydraulics 13 (eg potential energy of a load) to operate the steering and / or to charge the memory 7.
  • energy from the working hydraulics 13 eg potential energy of a load

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Power Steering Mechanism (AREA)

Claims (7)

  1. Machine de travail mobile, notamment chariot de manutention, comprenant un moteur à combustion interne et une pompe de direction hydraulique entraînée par celui-ci pour alimenter au moins un actionneur de direction, caractérisée en ce qu'un accumulateur hydraulique (7) est raccordé à la pompe de direction (2) et à l'actionneur de direction (4) et en ce que le volume refoulé spécifique de la pompe de direction (2) est dimensionné de telle sorte que le fonctionnement de l'actionneur de direction (4), à de faibles régimes de service du moteur à combustion interne (1), nécessite l'injection d'un fluide sous pression depuis la pompe de direction (2) et l'accumulateur (7) et, en cas de dépassement d'un régime de seuil, le fonctionnement de l'actionneur de direction (4) soit possible uniquement par l'injection du fluide sous pression depuis la pompe de direction (2).
  2. Machine de travail mobile selon la revendication 1, caractérisée en ce que le volume de l'accumulateur (7) est dimensionné de telle sorte que, lors de l'alimentation de l'actionneur de direction (4) uniquement avec du fluide sous pression en provenance de l'accumulateur (7) plein, il est possible d'actionner plusieurs fois l'actionneur de direction (4) de butée à butée.
  3. Machine de travail mobile selon la revendication 1 ou 2, caractérisée en ce qu'il est prévu un capteur de pression (10) qui détecte directement ou indirectement la pression dans l'accumulateur (7), lequel est en liaison active avec l'équipement de freinage de la machine de travail, une opération de freinage à commande forcée pouvant être déclenchée en cas de franchissement vers le bas d'une valeur limite de la pression.
  4. Machine de travail mobile selon l'une des revendications 1 à 3, caractérisée en ce que le régime de seuil du moteur à combustion interne (1) est de l'ordre des régimes de service moyens.
  5. Machine de travail mobile selon l'une des revendications 1 à 4, caractérisée en ce que la pompe de direction (2) est réalisée sous la forme d'une pompe à cylindrée constante qui est branchée à la suite d'une balance de pression (11) commandée par la pression de refoulement et mobile entre deux positions de commutation, la pompe de direction (2) étant reliée à l'actionneur de direction (4) dans la première position de commutation de la balance de pression (11) et à un réservoir (T) dans la deuxième position de commutation.
  6. Machine de travail mobile selon l'une des revendications 1 à 4, caractérisée en ce que la pompe de direction (2) est réalisée sous la forme d'une pompe à cylindrée variable.
  7. Machine de travail mobile selon l'une des revendications 1 à 6, caractérisée en ce qu'un circuit hydraulique de travail (13) en amont duquel est branché un arrangement de vannes pilotes (14) est raccordé à la pompe de direction (2) et au vérin de direction (4).
EP20020019785 2001-09-18 2002-09-04 Pompe de direction hydraulique entraînée par moteur à combustion Expired - Lifetime EP1293669B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2001145992 DE10145992A1 (de) 2001-09-18 2001-09-18 Mobile Arbeitsmaschine mit einem Verbrennungsmotor und einer davon angetriebenen hydraulischen Lenkpumpe
DE10145992 2001-09-18

Publications (3)

Publication Number Publication Date
EP1293669A2 EP1293669A2 (fr) 2003-03-19
EP1293669A3 EP1293669A3 (fr) 2005-04-13
EP1293669B1 true EP1293669B1 (fr) 2007-04-11

Family

ID=7699435

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020019785 Expired - Lifetime EP1293669B1 (fr) 2001-09-18 2002-09-04 Pompe de direction hydraulique entraînée par moteur à combustion

Country Status (2)

Country Link
EP (1) EP1293669B1 (fr)
DE (2) DE10145992A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105545135A (zh) * 2015-02-28 2016-05-04 北京航空航天大学 基于定量马达的新原理舱门瞬态作动系统

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010039509A1 (de) 2010-08-19 2012-02-23 Deere & Company Hydraulische Anordnung
DE102010042098B4 (de) 2010-10-07 2021-01-07 Zf Friedrichshafen Ag Verfahren zum Betreiben eines Antriebsstrangs
CN102305222B (zh) * 2011-08-24 2014-03-26 天津大学 带蓄能器缓冲作用的电液可变气门装置及其储能方法
CN102913412A (zh) * 2012-10-08 2013-02-06 潍坊优力动力配套有限公司 液压水泵机组
CN105644620A (zh) * 2016-04-05 2016-06-08 南京林业大学 一种节能型常压式液压助力转向系统
CN107246420A (zh) * 2017-07-20 2017-10-13 南京讯联智能科技有限公司 一种自带堵塞发讯的先导集成阀组
CN109591886B (zh) * 2018-11-30 2021-04-23 三一汽车起重机械有限公司 车辆辅助转向系统及自动驾驶车辆

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB876727A (en) * 1958-10-29 1961-09-06 Clark Equipment Co Hydraulic power transmission systems
US5222875A (en) * 1991-05-31 1993-06-29 Praxair Technology, Inc. Variable speed hydraulic pump system for liquid trailer
DE19955312B4 (de) * 1999-11-17 2005-10-27 Jungheinrich Ag Antriebssystem für Flurförderzeuge

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105545135A (zh) * 2015-02-28 2016-05-04 北京航空航天大学 基于定量马达的新原理舱门瞬态作动系统

Also Published As

Publication number Publication date
DE10145992A1 (de) 2003-04-03
DE50209903D1 (de) 2007-05-24
EP1293669A3 (fr) 2005-04-13
EP1293669A2 (fr) 2003-03-19

Similar Documents

Publication Publication Date Title
EP1963686B1 (fr) Mécanisme d entraînement hydrostatique
DE102010053105B4 (de) Hydrostatischer Antrieb
EP2840252B1 (fr) Moteur hydrostatique
EP2834542B1 (fr) Circuit hydraulique fermé
WO2009132765A1 (fr) Véhicule, notamment machine de travail mobile
WO2004067969A1 (fr) Systeme hydraulique pour entrainements lineaires commandes par des elements deplaceurs
DE102011107061A1 (de) Antriebsstrang eines Fahrzeugs, insbesondere einer mobilen Arbeitsmaschine
WO2011060844A1 (fr) Entraînement hydraulique à récupération d'énergie
DE102012111296A1 (de) Antriebsstrang eines Fahrzeugs, insbesondere einer mobilen Arbeitsmaschine
DE102012003320A1 (de) Mobile Arbeitsmaschine mit Energierückgewinnung zum Antrieb der Motorkühlung
EP1293669B1 (fr) Pompe de direction hydraulique entraînée par moteur à combustion
EP3095999B1 (fr) Systeme d'entrainement hydrostatique
DE3433896C2 (fr)
DE102013113206A1 (de) Batterie-elektrisch betriebenes Flurförderzeug
DE202012007215U1 (de) Hydraulikkreislauf und Kran
DE102008022429A1 (de) Elektrohydraulisches Aggregat
DE102012112381A1 (de) Antriebsachse eines Fahrzeugs mit einer einen hydraulischen Druckmittelspeicher umfassenden Energierückgewinnungseinrichtung
DE102005059237A1 (de) Hydraulische Lenkeinrichtung
DE3825726C2 (de) Hydraulische Schaltanordnung für ein Fahrzeug mit einem hydrostatischen Getriebe
DE19746090B4 (de) Hydrostatisches Antriebssystem für ein Fahrzeug
DE10315496A1 (de) Hydrauliksystem für ein batterie-elektrisch betriebenes Flurförderzeug
DE102014114526A1 (de) Hydraulisches Antriebssystem einer batterie-betriebenen mobilen Arbeitsmaschine
DE102012111300A1 (de) Hydrostatisches Triebwerk als hydraulischer Starter eines Verbrennungsmotors
EP2307725A1 (fr) Pompe à pistons multiples
DE102009031412A1 (de) Hydrauliksystem mit Brennkraftmaschine und Verfahren zur Regelung des Hydrauliksystems mit Brennkraftmaschine zum Betreiben einer mobilen Arbeitsmaschine

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO SI

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO SI

RIC1 Information provided on ipc code assigned before grant

Ipc: 7F 04B 17/05 B

Ipc: 7F 04B 23/02 A

Ipc: 7B 62D 5/07 B

Ipc: 7F 15B 1/02 B

Ipc: 7B 66F 9/22 B

17P Request for examination filed

Effective date: 20050920

AKX Designation fees paid

Designated state(s): DE FR GB IT SE

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

RIC1 Information provided on ipc code assigned before grant

Ipc: F04B 23/02 20060101AFI20061017BHEP

Ipc: F15B 1/02 20060101ALI20061017BHEP

Ipc: B62D 5/06 20060101ALI20061017BHEP

Ipc: F04B 17/05 20060101ALI20061017BHEP

Ipc: B66F 9/22 20060101ALI20061017BHEP

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BAVENDIEK, RAINER DR.

Inventor name: MACIT, RECEP

Inventor name: HUEBNER, JOERG

Inventor name: NEUF, OTTMAR

Inventor name: HOFFMOCKEL, BERNDT

Inventor name: BAUER, STEFAN

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT SE

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REF Corresponds to:

Ref document number: 50209903

Country of ref document: DE

Date of ref document: 20070524

Kind code of ref document: P

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20070711

GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]

Effective date: 20070411

EN Fr: translation not filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20080114

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20070411

Ref country code: GB

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20070411

Ref country code: FR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20071207

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080401

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20070411