EP1004542B1 - Système hydraulique notamment pour un chariot de manutention - Google Patents

Système hydraulique notamment pour un chariot de manutention Download PDF

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Publication number
EP1004542B1
EP1004542B1 EP99123341A EP99123341A EP1004542B1 EP 1004542 B1 EP1004542 B1 EP 1004542B1 EP 99123341 A EP99123341 A EP 99123341A EP 99123341 A EP99123341 A EP 99123341A EP 1004542 B1 EP1004542 B1 EP 1004542B1
Authority
EP
European Patent Office
Prior art keywords
tank
hydraulic
working machine
machine according
valve
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
EP99123341A
Other languages
German (de)
English (en)
Other versions
EP1004542A1 (fr
Inventor
Rainer Dr.-Ing. Bavendiek
Claus-Peter Dipl.-Ing. Jahns
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 EP1004542A1 publication Critical patent/EP1004542A1/fr
Application granted granted Critical
Publication of EP1004542B1 publication Critical patent/EP1004542B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/22—Hydraulic devices or systems
    • 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
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • 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
    • F04B23/021—Pumping installations or systems having reservoirs the pump being immersed in the reservoir
    • 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
    • F04B23/021—Pumping installations or systems having reservoirs the pump being immersed in the reservoir
    • F04B23/023—Pumping installations or systems having reservoirs the pump being immersed in the reservoir only the pump-part being immersed, the driving-part being outside the reservoir
    • 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/26—Supply reservoir or sump assemblies

Definitions

  • the invention relates to a working machine, in particular industrial truck, with a hydraulic system which has at least one tank for hydraulic fluid and at least one hydraulic pump, wherein the hydraulic pump is arranged inside the tank.
  • Work machines are often equipped with a hydraulic system, via which, depending on the type of work machine, the drive of various functions of the machine. In the case of industrial trucks, this usually involves lifting and tilting a load, steering the truck and possibly additional functions for handling loads.
  • the hydraulic system usually has a tank from which hydraulic fluid is sucked by means of a pump. Downstream of the pump is a priority valve, which preferably supplies a hydraulic steering device with hydraulic fluid.
  • hydraulic fluid is provided via arbitrarily controllable directional valves further hydraulic consumers available. These are usually hydraulic cylinders that generate the forces needed to lift, tilt or handle a load.
  • the steering device and the other hydraulic consumers are further connected via return lines to the tank, wherein in the return lines optionally a lowering brake for reducing the flow rate of hydraulic fluid, or a biasing valve for maintaining a predetermined pressure level can be arranged in the corresponding return line.
  • the said hydraulic components are usually separated from each other attached to a frame of the working machine and connected to each other by hose or pipe lines in working machines of the prior art. It is also known to combine various hydraulic components into assemblies and to fix them together on the frame of the machine. In any case, have known hydraulic systems However, a number of joints and joints, which are sealed with seals of various types against leakage of hydraulic fluid.
  • the present invention has for its object to provide a generic machine available, in which the risk of leakage of hydraulic fluid is further reduced.
  • At least one directional control valve is disposed within the tank.
  • the supply of hydraulic fluid to various hydraulic consumers is controlled in response to a signal generated by an operator.
  • Leaks of these usually proportionally controllable directional valves, which may also be designed as slide valves are collected by the tank.
  • slide valves can be dispensed with the costly required in devices of the prior art complex tank return of the type of construction incurred leakage oil. It is even possible to dispense with the commonly used seals against contamination of the slide valves, as they are exposed due to the arrangement in the tank no external influences.
  • an electric drive motor of the hydraulic pump is arranged inside the tank. It is thus no mechanical rotary feedthrough through a wall of the tank required.
  • the hydraulic fluid in the tank also serves as a coolant for the electric drive motor.
  • the arrangement of the electric drive motor within the tank is particularly suitable when a maintenance-free three-phase motor is used.
  • a further improvement in the leakage of hydraulic fluid results when a priority valve is located within the tank.
  • the priority valve ensures that a steering device of the working machine is always sufficiently supplied with hydraulic fluid. Leaks in the area of the priority valve, for example at the hydraulic connection points, do not lead to contamination of the environment by hydraulic fluid in this arrangement. Instead, the leaking hydraulic fluid is collected in the tank.
  • priority valve is attached to the hydraulic pump by means of a flange connection, no additional hydraulic lines are required between these components. Hydraulic pump and priority valve can be installed as a pre-assembled unit in the tank.
  • the directional control valve is designed to be electrically controlled.
  • the directional control valves can thus be arranged spatially independently of the respective associated control lever.
  • a plurality of directional valves are provided which form a directional control valve block.
  • the directional control valve block can be installed in the tank pre-assembled.
  • the priority valve is a part of the directional control valve block. There are therefore no hydraulic lines required to connect the priority valve with the directional control valve block.
  • the steering valve can be designed as part of the directional control valve block.
  • bias valves and / or a lowering brake valve are disposed within the tank.
  • the biasing valve and lowering brake valve are arranged in the return lines of hydraulic consumers. These components can also be arranged within the tank according to the invention.
  • the figure shows a tank 1 of a hydraulic system of a working machine.
  • the tank 1 is sealed with a tank cap 2.
  • a number of components of the hydraulic system are arranged according to the invention.
  • An electric drive motor 3 designed as a three-phase motor is located below the filling level line 4 of the tank 1 and is thus cooled by the hydraulic fluid surrounding it. Flanged to the drive motor 3 is a hydraulic pump 5, which is driven by the drive motor 3. The hydraulic pump 5 sucks hydraulic fluid from the tank 1 via an intake filter 6 arranged in a suction pipe 7.
  • a directional valve block 8 is flanged to the hydraulic pump 5, which in this embodiment comprises a priority valve 8a, a steering valve 8b and two-way valves 8c, 8d.
  • a priority valve 8a a priority valve 8a
  • a steering valve 8b a steering valve 8b
  • two-way valves 8c, 8d a directional valve block 8 is flanged to the hydraulic pump 5, which in this embodiment comprises a priority valve 8a, a steering valve 8b and two-way valves 8c, 8d.
  • the steering valve 8b and the directional control valves 8c, 8d lead via a flange plate 10 hydraulic pressure lines 9 to the respective hydraulic consumers.
  • a passage for electrical lines is further arranged.
  • a control and supply line 11 for the electric drive motor 3 and signal lines 12 to the steering valve 8b and the directional valves 8c, 8d are provided.
  • the signal lines are connected to the corresponding control levers or a steering transmitter, with which electrical control signals are generated.
  • return lines 13 through which hydraulic fluid from the various hydraulic consumers flows back into the tank 1.
  • the return lines 13 are guided via a flange plate 14 through the tank cap 2 into the tank 1.
  • return line which is connected to a not shown lifting cylinder of the machine, there is a lowering brake valve 15.
  • the lowering brake valve 15 prevents too rapid outflow of hydraulic oil into the tank 1 and is therefore suitable, for example, the lowering movement of a load receiving device brake.
  • the return line is a bias valve 16, with which a certain predetermined pressure in the return line is maintained.
  • the hydraulic pump 1, the directional control valve block 8, the lowering brake valve 15 and the biasing valve 16 are arranged inside the tank 1. Leaks in these hydraulic components or at their joints therefore do not lead to contamination of the machine and its environment with hydraulic fluid. Instead, the unintentionally leaking hydraulic fluid is collected in the tank.

Claims (11)

  1. Machine de travail, en particulier chariot de manutention, comprenant un système hydraulique, qui présente au moins un réservoir (1) pour un fluide hydraulique et au moins une pompe hydraulique (5), la pompe hydraulique (5) étant disposée à l'intérieur du réservoir (1), caractérisée en ce qu'au moins un distributeur (8c, 8d) est disposé à l'intérieur du réservoir (1).
  2. Machine de travail selon la revendication 1, caractérisée en ce qu'un moteur d'entraînement électrique (3) de la pompe hydraulique (5) est disposé à l'intérieur du réservoir (1).
  3. Machine de travail selon la revendication 1, caractérisée en ce qu'un moteur d'entraînement électrique (3) de la pompe hydraulique (5) est disposé en dehors du réservoir (1), un arbre reliant le moteur d'entraînement électrique (3) à la pompe hydraulique (5) étant rendu étanche par rapport au réservoir (1) par le biais d'une bague d'étanchéité d'arbre.
  4. Machine de travail selon l'une quelconque des revendications 1 à 3, caractérisée en ce qu'une soupape de priorité (8a) est disposée à l'intérieur du réservoir (1).
  5. Machine de travail selon la revendication 4, caractérisée en ce que la soupape de priorité (8a) est fixée à la pompe hydraulique (5) au moyen d'une connexion par bride.
  6. Machine de travail selon l'une quelconque des revendications 1 à 5, caractérisée en ce que le distributeur (8c, 8d) est réalisé de manière commandable électriquement.
  7. Machine de travail selon l'une quelconque des revendications 1 à 6, caractérisée en ce que l'on prévoit plusieurs distributeurs (8c, 8d) qui forment un bloc de distributeurs (8).
  8. Machine de travail selon l'une quelconque des revendications 4 à 7, caractérisée en ce que la soupape de priorité (8a) fait partie du bloc de distributeurs (8).
  9. Machine de travail selon l'une quelconque des revendications 1 à 8, caractérisée en ce qu'une soupape de direction (8b) est disposée à l'intérieur du réservoir (1).
  10. Machine de travail selon la revendication 9, caractérisée en ce que la soupape de direction (8b) fait partie du bloc de distributeurs (8).
  11. Machine de travail selon l'une quelconque des revendications 1 à 10, caractérisée en ce qu'une ou plusieurs soupapes de précontrainte (16) et/ou une soupape pour frein de descente (15) sont disposées à l'intérieur du réservoir (1).
EP99123341A 1998-11-25 1999-11-23 Système hydraulique notamment pour un chariot de manutention Expired - Lifetime EP1004542B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19854417 1998-11-25
DE19854417A DE19854417A1 (de) 1998-11-25 1998-11-25 Arbeitsmaschine, insbesondere Flurförderzeug

Publications (2)

Publication Number Publication Date
EP1004542A1 EP1004542A1 (fr) 2000-05-31
EP1004542B1 true EP1004542B1 (fr) 2006-01-25

Family

ID=7889004

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99123341A Expired - Lifetime EP1004542B1 (fr) 1998-11-25 1999-11-23 Système hydraulique notamment pour un chariot de manutention

Country Status (3)

Country Link
US (1) US6290474B1 (fr)
EP (1) EP1004542B1 (fr)
DE (2) DE19854417A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AUPP786598A0 (en) * 1998-12-23 1999-01-21 Jaden Charters Pty Ltd Improved skid-steer vehicle
DE20205936U1 (de) * 2002-04-16 2002-08-22 Trw Fahrwerksyst Gmbh & Co Hydraulikpumpe, insbesondere für ein Servolenksystem
FR2843601B1 (fr) * 2002-08-13 2005-03-04 Rouby Ind Dispositif de manoeuvre de mecanismes associes aux ecluses et de regulation de flux de rivieres
US7185449B2 (en) * 2004-03-16 2007-03-06 Kime James A System for controlling the hydraulic actuated components of a truck
DE102004032256B3 (de) * 2004-07-03 2005-12-15 Jungheinrich Ag Hydraulikaggregat für Flurförderzeuge
WO2009030793A1 (fr) * 2007-08-27 2009-03-12 Romeral Cabeza, Angel Mécanisme multiplicateur de pression
US8806862B2 (en) * 2007-12-20 2014-08-19 Parker-Hannifin Corporation Smart flow sharing system
TWI407019B (zh) * 2010-07-30 2013-09-01 Wen Kwo Tien 具有自動封閉功能的油壓管路模組
US20150247493A1 (en) * 2014-02-28 2015-09-03 Schlumberger Technology Corporation High pressure transfer motor-pump
US11339772B2 (en) * 2019-12-13 2022-05-24 Kti Hydraulics Inc. Hydraulic power units with submerged motors
WO2021118607A1 (fr) * 2019-12-14 2021-06-17 Kti Hydraulics Inc. Unités de puissance hydraulique dotées de moteurs submergés
EP4239195A1 (fr) * 2022-03-01 2023-09-06 Mathieu Centrale hydraulique

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Publication number Priority date Publication date Assignee Title
FR1586186A (fr) * 1968-09-06 1970-02-13
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DE2337276A1 (de) * 1973-07-23 1975-02-06 Karl Hehl Maschinenfuss einer spritzgiessmaschine
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Also Published As

Publication number Publication date
DE59913077D1 (de) 2006-04-13
DE19854417A1 (de) 2000-05-31
EP1004542A1 (fr) 2000-05-31
US6290474B1 (en) 2001-09-18

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