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WO2001071748A1 - Dispositif destine a alimenter un appareil consommateur hydraulique en milieu de pression - Google Patents

Dispositif destine a alimenter un appareil consommateur hydraulique en milieu de pression Download PDF

Info

Publication number
WO2001071748A1
WO2001071748A1 PCT/DE2001/000535 DE0100535W WO0171748A1 WO 2001071748 A1 WO2001071748 A1 WO 2001071748A1 DE 0100535 W DE0100535 W DE 0100535W WO 0171748 A1 WO0171748 A1 WO 0171748A1
Authority
WO
WIPO (PCT)
Prior art keywords
switching tube
level switch
float
cover
storage container
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.)
Ceased
Application number
PCT/DE2001/000535
Other languages
German (de)
English (en)
Inventor
Hans Aichele
Wolfgang Steudel
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 WO2001071748A1 publication Critical patent/WO2001071748A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H01H36/02—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding actuated by movement of a float carrying a magnet
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/18—Switches operated by change of liquid level or of liquid density, e.g. float switch

Definitions

  • the invention relates to a device for supplying a hydraulic consumer with pressure medium according to the preamble of claim 1.
  • Such a device is, for example, from the training documents "Hydraulics in theory and practice” from Robert Bosch GmbH, Business Unit Automation Technology, Erbach,
  • This device forms a compact pressure supply unit, which consists of a hydraulic pressure generator, a drive unit and a storage container. An external hydraulic consumer (not shown) can be connected to the pressure supply unit.
  • a control unit which regulates the voltage supply to the drive unit as a function of the fill level of the storage container.
  • the level is detected by a level switch.
  • This consists of a switch tube with a fixed, fixable switching element and a movably guided one Float with an element acting on the switching element.
  • the switching tube protrudes into the interior of the storage container, its end being at a distance from the bottom side of the storage container opposite the cover.
  • a device with the features of claim 1 has the advantage that the switching point of the
  • the level switch is only dependent on the level and is therefore independent of part tolerances, strains or the current operating conditions of the device. This is achieved by arranging the level switch on the storage container, the one
  • Relative mobility between the two components is ensured in connection with a pretensioned element that presses the free end of the level switch under all operating conditions of the device against the bottom surface of the storage container.
  • a coil spring is particularly suitable as a pre-stressed element. To guide the level switch, it is sufficient to manufacture through-bores on the storage container that are sealed off from the outside.
  • An arrangement of the level switch on a cover which closes an opening of the storage container is particularly advantageous.
  • connecting pieces and channels are on this cover trained, which allow contacting the reservoir with pressure medium returning lines.
  • a filter can be arranged on the inside of the cover in order to clean the pressure medium flowing back from impurities. At the same time, the filter acts as a mechanical stop for the level switch in the non-installed state and forms a second guide for the level switch.
  • the level switch consists of a switching tube with a switching element arranged therein and a movably guided float with an element acting on the switching element.
  • the float is designed in a ring and encloses the switching tube. An easily feasible mounting of the float on the switching tube is achieved by radially protruding elements that are at the free end of the
  • Switch tube are formed. These elements engage in corresponding recesses in the float. After assembly, the float can be rotated relative to the switching tube so that the recesses and the elements are no longer in alignment.
  • FIG. 1 shows a device for this
  • the unit 10 shown in FIG. 1 for supplying a hydraulic consumer with pressure medium consists of a mounting flange 12, a pressure generator 14 anchored thereon, an electric motor 16 which is coupled to the pressure generator 14 and a reservoir 18.
  • Conventionally known gearwheels come as pressure generator 14. or piston pumps into consideration, which suck in pressure medium from the storage container 18 via a suction port 22 and require a pressure connection.
  • This pressure connection is usually provided on the mounting flange 12, but in the exemplary embodiment lies on the side facing away from the viewer and can therefore not be seen in FIG. 1.
  • the storage container 18 is a hollow body, preferably made of plastic, the outside of which faces the pressure generator 14 has an opening 24 with a molded-on neck. With this neck, the storage container 18 is pushed onto a dimensionally coordinated collar on the mounting flange 12 and anchored in a pressure-tight manner by means of a tensioning band 26. The pressure generator 14 projects through the opening 24 of the storage container 18 into the interior of the storage container 18.
  • An opening 28 for filling with pressure medium is provided on the upper side of the storage container 18.
  • This opening 28 is closed by a cover 30 with integrally formed connecting piece 32 for contacting any pressure medium returning lines.
  • the cover 30 extends in sections into the opening 28 and is fixed to the storage container 18 with the aid of a second tensioning band 34.
  • a filter 38 which is attached to the inside of the cover 30 to clean the back pressure fluid from dirt, there is also a Level switch 40 arranged on the cover 30.
  • This level switch 40 comprises a rod-shaped switching tube 42 which projects into the interior of the storage container 18.
  • the switching tube 42 arranged centrally on the cover 30 is guided in an axially movable manner in a through bore 44 of the cover 30 and in a recess 46 in the bottom of the filter 38.
  • the switching tube 42 is passed through the filter 38 and has a displaceably mounted float 50 in the region of its free end, that is to say which is remote from the cover 28.
  • This float 50 is ring-shaped and encloses the switching tube 42 for its guidance.
  • a switching element for example a reed contact (not shown)
  • a reed contact is arranged in the switching tube 42 in an undetectable manner, while an element, also not shown, is accommodated in the float 50 is which this switching element actuates contactlessly with the appropriate level of pressure medium.
  • other magnetic field-sensitive, inductive or capacitive sensors can also be used.
  • Signal cables 52 emerge from the opening-side end of the switching tube 42. These are on the one hand with the
  • Switching element contacts and on the other hand lead to an electronic control unit 54.
  • the electric motor 16 of the compact unit 10 is also connected to this control unit 54. Its voltage supply is interrupted as soon as a desired pressure level has been reached at the connected hydraulic consumer or as soon as the fill level in the storage container 18 drops below a predetermined setpoint.
  • This setpoint can be adapted to the respective operating conditions of the device 10 by axially displacing the switching element within the switching tube 42.
  • the second end of the switching tube 42 opposite the cover 30 bears against the inner wall of the storage container 18.
  • the level switch 40 is equipped with a prestressed coil spring 56. Their pretension is able to overcome the wall friction of the sealing bodies 48 acting on the switching tube 42 and inhibiting its movement.
  • the coil spring 56 is clamped between a collar 58 of the switching tube 42 and the cover 30 and centered on the switching tube 42.
  • the protruding collar 58 on the switching tube 42 lies within the filter 38, so that its bottom in the preassembled state of the installation unit consisting of cover 30, level switch 40 and filter 38 acts as a stop which defines the end position of the switching tube 42 relative to the cover 30.
  • this collar 58 In the installed state according to FIG. 1, there is a distance between this collar 58 and the bottom of the filter 38, so that part tolerances or operating pressure or temperature-related expansions of the components, in particular of the storage container 18, can be compensated for.
  • the switching point of the switching element located in the switching tube 42 is therefore only dependent on the fill level of the storage container 18.
  • Figure 2 shows the detail X of Figure 1 in an enlarged view. This shows in sections of the end of the switching tube 42 facing away from the cover 28 with the float 50 mounted axially displaceably thereon. At the end of the switching tube 42, a radially projecting and axially delimited element 60 can be seen; a guide 62 provided in the float 50 is extended by a continuous groove-shaped recess 64. In terms of size, the projection 60 is matched to the recess 64 in such a way that, if the corresponding Alignment of the two parts to each other, a problem pushing the float 50 onto the switching tube 42 is possible.
  • the shimmer 50 After installation of the shimmer 50, it can be rotated relative to the switching tube 42, so that the recess 64 is no longer aligned with the projection 60.
  • the float 50 is thus held captively on the switching tube 42 until the level switch 40 is installed in the storage container 18, without the need to separately install components.
  • element 60 only as a flag. This flag could be placed on the circumference of the switching tube 42 due to its mobility during assembly of the float 50, so that recesses 64 in the float 50 could be dispensed with. After assembly, the flag rises again due to elasticity and can thus act as a protection against loss. In the state of the level switch 40 installed in the storage container 18, this loss protection is inoperative.

Landscapes

  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Abstract

Dispositif (10) destiné à alimenter un appareil consommateur hydraulique en milieu de pression, qui comporte un générateur de pression (14), un moteur électrique (16) et un réservoir d'alimentation (18). Le réservoir d'alimentation (18) est équipé d'un commutateur (40) permettant l'alimentation en tension du moteur électrique (16) en fonction du niveau de remplissage du réservoir, ce qui permet d'éviter l'aspiration d'air. Selon la présente invention, pour éviter que le seuil de commutation du commutateur (40) dépende des tolérances de pièce et des dilatations partielles, l'ancrage du commutateur (40) dans le réservoir d'alimentation (18) est réalisé de manière telle qu'il permet un mouvement relatif des deux structures. En outre, ledit commutateur (40) coopère avec un élément précontraint qui garantit la position permanente du commutateur au niveau de la surface de fond du réservoir d'alimentation (18).
PCT/DE2001/000535 2000-03-21 2001-02-13 Dispositif destine a alimenter un appareil consommateur hydraulique en milieu de pression Ceased WO2001071748A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10013901.9 2000-03-21
DE2000113901 DE10013901A1 (de) 2000-03-21 2000-03-21 Einrichtung zur Versorgung eines hydraulischen Verbrauchers mit Druckmittel

Publications (1)

Publication Number Publication Date
WO2001071748A1 true WO2001071748A1 (fr) 2001-09-27

Family

ID=7635715

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2001/000535 Ceased WO2001071748A1 (fr) 2000-03-21 2001-02-13 Dispositif destine a alimenter un appareil consommateur hydraulique en milieu de pression

Country Status (2)

Country Link
DE (1) DE10013901A1 (fr)
WO (1) WO2001071748A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7202854B2 (en) 2001-11-09 2007-04-10 Lifescan, Inc. Alphanumeric keypad and display system and method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3643949A1 (de) * 1986-12-22 1988-06-23 Vdo Schindling Fluessigkeitsbehaelter
DE8901091U1 (de) * 1989-02-01 1989-03-23 ELB-Füllstandsgeräte Bundschuh GmbH + Co, 6140 Bensheim Füllstands-Begrenzungsschalter
WO1998028598A1 (fr) * 1996-12-20 1998-07-02 Mts Systems Corporation Sonde de detection de position magnetostrictive avec guide d'ondes reference par rapport a la pointe

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3643949A1 (de) * 1986-12-22 1988-06-23 Vdo Schindling Fluessigkeitsbehaelter
DE8901091U1 (de) * 1989-02-01 1989-03-23 ELB-Füllstandsgeräte Bundschuh GmbH + Co, 6140 Bensheim Füllstands-Begrenzungsschalter
WO1998028598A1 (fr) * 1996-12-20 1998-07-02 Mts Systems Corporation Sonde de detection de position magnetostrictive avec guide d'ondes reference par rapport a la pointe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7202854B2 (en) 2001-11-09 2007-04-10 Lifescan, Inc. Alphanumeric keypad and display system and method

Also Published As

Publication number Publication date
DE10013901A1 (de) 2001-10-04

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