EP0783395B1 - Unite de commande hydraulique - Google Patents

Unite de commande hydraulique Download PDF

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Publication number
EP0783395B1
EP0783395B1 EP94924302A EP94924302A EP0783395B1 EP 0783395 B1 EP0783395 B1 EP 0783395B1 EP 94924302 A EP94924302 A EP 94924302A EP 94924302 A EP94924302 A EP 94924302A EP 0783395 B1 EP0783395 B1 EP 0783395B1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
tool according
pressure pump
hydraulic tool
annular
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
EP94924302A
Other languages
German (de)
English (en)
Other versions
EP0783395A1 (fr
Inventor
Heinz Schwaiger
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.)
Weber-Hydraulik GmbH
Original Assignee
Weber Hydraulik GmbH Austria
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 Weber Hydraulik GmbH Austria filed Critical Weber Hydraulik GmbH Austria
Publication of EP0783395A1 publication Critical patent/EP0783395A1/fr
Application granted granted Critical
Publication of EP0783395B1 publication Critical patent/EP0783395B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/005—Hydraulic driving means
    • 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
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators
    • F04B11/0033—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators with a mechanical spring
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • F04B49/03—Stopping, starting, unloading or idling control by means of valves
    • 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
    • F04B2205/00—Fluid parameters
    • F04B2205/16—Opening or closing of a valve in a circuit

Definitions

  • the present invention relates to a hydraulic tool according to the preamble of claim 1.
  • Such a hydraulic tool is from the previously published (same applicant) German utility model DE-U-92 03 270 known.
  • a tool 8 by means of a Power transmission device 25 on a working piston 24 a working cylinder 3 attached.
  • This tool 8 forms part of the whole, portable and very mobile Hydraulic tool, which by the operator on two Handles 5 and 6 held and operated via a switch 7 can be.
  • a Hydraulic circuit control valve assembly (not shown) controlled to operate the working cylinder 3.
  • the pressure of a hydraulic fluid used in the hydraulic circuit is generated by the hydraulic high pressure pump 2, which is driven by an electric motor 1, which an electrical connection 9 receives its power supply.
  • the hydraulic high-pressure pump 2 comprises a swash plate 18, which is supported by an angular contact ball bearing 26 and by means of pistons 10 that entering through an inflow opening 13 Hydraulic fluid compressed and via check valves 12 feeds a collecting duct 15.
  • the hydraulic fluid will the working piston 24 via a feed bore (not shown) supplied or discharged via a return bore 29.
  • the ring buffer 19 is in the case of DE-U-92 03 270 Working cylinder 3 arranged around; he is seen axially spaced from the hydraulic high-pressure pump 2 and over corresponding connecting lines or holes on the Hydraulic circuit connected.
  • the number of sealing points is relatively high in this arrangement.
  • US-A-2 444 550 is a hydraulic drive unit for a closed hydraulic circuit with one Hydraulic high pressure pump and an expansion tank for a hydraulic fluid is known.
  • the expansion tank of this Drive unit is designed as a pressure accumulator and surrounds the hydraulic high-pressure pump is essentially cylindrical in shape.
  • the pressure accumulator stands over connecting holes with the inside of the hydraulic high pressure pump and has a variable volume. For controlling a control device is provided for the drive unit.
  • the ring buffer is in the form of a cylinder jacket arranged around the hydraulic high pressure pump and forms an integral unit with it. This eliminates longer connecting lines and the associated Sealing points.
  • the hydraulic drive unit according to the invention is very compactly built and has only one connection to the outside for the (electric) drive (right in Fig. 1) or the hydraulic output (left in Fig. 2). Otherwise the hydraulic drive unit forms a closed one Unit, the manufacture of which also simplifies is.
  • the energy supply can via the public power grid, via a portable Power generator or also ensured by a battery will.
  • the hydraulic high-pressure pump is designated by 102 from the electric motor 101 directly or via a transmission (not shown) is driven.
  • the hydraulic high pressure pump 102 is described below with reference to FIG. 2 described in more detail.
  • a ring buffer 119 is arranged around it, which essentially has the shape of a cylinder jacket.
  • an annular piston 120 Within the Ring memory 119 is an annular piston 120, the is essentially L-shaped, the longer one Leg runs in the axial direction and radially facing inward has a recess that one Annulus 134 forms that in the right dead center position (Fig. 1) of the annular piston 120 over two radially extending Connection bores 132 and 133 with the interior of the hydraulic high-pressure pump 102 communicates.
  • the ring piston 120 is opposite the exterior of the hydraulic high pressure pump 102 provided with a seal 135; the shorter one Leg of the annular piston 120 extends radially Direction and is equipped with a seal 136 which seals the ring buffer 119 to the outer jacket.
  • a spring 137 is arranged, the Ring piston 120 loaded and pushes to the right in Fig. 1.
  • the hydraulic drive unit forms a compact unit, at the one end (right in Fig. 1) the drive is required via the electric motor 101 and at the output at the other end (left in Fig. 1) two feed lines 139 (Fig. 2).
  • the hydraulic drive unit is via the switch 107, which in turn actuated the control slide 140 by means of the control rocker 131, controlled.
  • a microswitch 122 is provided for switching the electric motor on and off 101. Since the Ring buffer 119 "in" the hydraulic high-pressure pump 102 is integrated and not around the working cylinder as before arranged around is a much more compact Design possible.
  • the hydraulic high-pressure pump 102 is shown in FIG. 2.
  • the hydraulic high-pressure pump 102 is driven by means of the swash plate 118 with a constant angle of attack, which the pistons 110 back and forth in the cylinders moved here.
  • the swash plate 118 is in turn over the electric motor 101 driven, between the swash plate 118 and electric motor 101 for storage purposes Rolling bearings, preferably an angular contact ball bearing 126 is.
  • the pistons 110 form together with the cylinders at the end facing away from the swash plate 118, compression chambers 111, the discharge openings of check valves 112 are closable.
  • the cylinders are preferably made of hard metal; this has the advantage that at very high pressures, the expansion of the cylinder bores is relatively small.
  • the pressure generated by the hydraulic high pressure pump 102 is fed to a collecting channel 115 which is between the hydraulic high pressure pump 102 and the working cylinder (not shown).
  • the rear handle 105 is the electric motor 101 can be controlled via the switch 122 (FIG. 1), and on the other hand, by means of the control slide 140 Hydraulic fluid via the two feed lines 139 to the Working cylinder is fed or discharged.
  • Switching the electric motor 101 on and off via the Switch 122 is only in the end positions of the control spool 140 possible. With this forced mechanical coupling it is ensured that the electric motor 101 or the hydraulic high pressure pump 102 not against the closed Control spool 140 can run.
  • connection bores 132 and 133 to the ring buffer 119 takes place inside the hydraulic high pressure pump 102 pressure equalization instead of leads to a lower load on the seals 138.
  • FIG. 3 shows part of the hydraulic drive unit on average, with the control spool 140 set so is that the hydraulic fluid passes through the center of the two Supply lines 139 can flow; there is also a filling valve 116, which is shown when filling the Hydraulic circuit with hydraulic oil is used.
  • a filling valve 116 which is shown when filling the Hydraulic circuit with hydraulic oil is used.
  • reference number 117 is an adjustable pressure relief valve designated; this protects the drive unit from overload and allows the pressure in the hydraulic circuit adapted for different uses, limit.
  • a pressure gauge can be connected to port 114 will.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Reciprocating Pumps (AREA)
  • Vehicle Body Suspensions (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Braking Systems And Boosters (AREA)

Claims (10)

  1. Outil hydraulique à circuit hydraulique fermé, dans lequel un piston de travail (24) peut être alimenté depuis une pompe de haute pression (202), en fluide hydraulique, depuis un accumulateur annulaire, l'accumulateur annulaire servant de récipient de compensation, recevant le fluide hydraulique pour la compensation des déplacements du piston de travail, caractérisé en ce que l'accumulateur annulaire (119) entoure la pompe à haute pression (102), en formant une enveloppe cylindrique, et constitue avec celle-ci un ensemble d'entraínement intégré pour le piston de travail (24).
  2. Outil hydraulique selon la revendication 1, caractérisé en ce que le volume contenu dans l'accumulateur annulaire (119) est variable, via-à-vis d'un piston annulaire (120) chargé par un ressort (137).
  3. Outil hydraulique selon la revendication 1 ou 2, caractérisé en ce que l'accumulateur annulaire (119) est relié à la partie basse pression de la pompe haute pression (102), par l'intermédiaire de perçages de liaison (132, 133) radiaux.
  4. Outil hydraulique selon la revendication 2 ou 3, caractérisé en ce que le piston annulaire (120) est réalisé avec une forme sensiblement en L, la branche longue s'étendant dans la direction axiale et la branche courte s'étendant radialement vers l'extérieur.
  5. Outil hydraulique selon la revendication 4, caractérisé en ce que la branche longue présente sur sa face radialement intérieure un évidement qui constitue un espace annulaire (134), qui est relié au volume intérieur de la pompe haute pression (102), en une position de point mort du piston annulaire (120), par l'intermédiaire des perçages de liaison (132, 133).
  6. Outil hydraulique selon la revendication 4 ou 5, caractérisé en ce que la branche longue est pourvue radialement intérieurement d'un joint d'étanchéité (135).
  7. Outil hydraulique selon l'une des revendications 4 à 6, caractérisé en ce que la branche courte est pourvue radialement extérieurement d'un joint d'étanchéité (136).
  8. Outil hydraulique selon l'une des revendications 3 à 7, caractérisé en ce que les perçages de liaison (132, 133), ménagés à l'intérieur de la pompe de pression (102), veillent à assurer une compensation de pression, si bien que les joints d'étanchéité (138), qui sont prévus côté entraínement, sont déchargés.
  9. Outil hydraulique selon l'une des revendications 3 à 8, caractérisé en ce que les perçages de liaison (132, 133), en observant axialement, sont disposés des deux côtés d'un palier à roulement qui est prévu pour le tourillonnement d'un disque à nutation (118) de la pompe haute pression (102).
  10. Outil hydraulique selon l'une des revendications 2 à 9, caractérisé en ce que le ressort (137) est un ressort hélicoïdal.
EP94924302A 1993-07-14 1994-07-29 Unite de commande hydraulique Expired - Lifetime EP0783395B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4323574A DE4323574C1 (de) 1993-07-14 1993-07-14 Hydraulik-Werkzeug
PCT/EP1994/002530 WO1996004107A1 (fr) 1993-07-14 1994-07-29 Unite de commande hydraulique

Publications (2)

Publication Number Publication Date
EP0783395A1 EP0783395A1 (fr) 1997-07-16
EP0783395B1 true EP0783395B1 (fr) 1998-09-30

Family

ID=6492777

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94924302A Expired - Lifetime EP0783395B1 (fr) 1993-07-14 1994-07-29 Unite de commande hydraulique

Country Status (4)

Country Link
EP (1) EP0783395B1 (fr)
AT (1) ATE171661T1 (fr)
DE (2) DE4323574C1 (fr)
WO (1) WO1996004107A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3638378B1 (fr) 2017-06-12 2021-04-07 Weber-Hydraulik GmbH Unite hydraulique pour outils de sauvetage hydraulique, et equipe d'outil de sauvetage

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29519941U1 (de) * 1995-12-15 1997-04-17 Wagner Paul Heinz Hydraulisches Pumpenaggregat
DE19652691A1 (de) * 1996-12-18 1998-06-25 Roemheld A Gmbh & Co Kg Kupplungs- und Schaltelement für Hydraulikwerkzeuge
DE29809935U1 (de) * 1998-06-03 1998-10-08 Heilmeier & Weinlein Hydraulisches Motor-Pumpenaggregat
DE10028957C2 (de) * 2000-06-16 2002-07-11 Lukas Hydraulik Gmbh & Co Kg Tragbare Hydraulikpumpeneinheit

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2134237A (en) * 1936-11-10 1938-10-25 Saulnier Raymond Pump for aircraft machinery
US2444550A (en) * 1944-05-20 1948-07-06 Electrol Inc Hydraulic power pack unit
DE1223784B (de) * 1963-07-03 1966-09-01 Salzgitter Maschinen Ag Bohrhammer
US4094365A (en) * 1974-05-20 1978-06-13 Robert Bosch Gmbh Electrohydraulically operated portable power tool
US4735048A (en) * 1986-10-24 1988-04-05 The Gregory Company Hydraulic tool
DE9203270U1 (fr) * 1992-03-11 1992-06-11 Hugo Junkers Werke Gmbh, 8000 Muenchen, De
US5243761A (en) * 1992-03-18 1993-09-14 Hale Fire Pump Company Portable rescue tool

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3638378B1 (fr) 2017-06-12 2021-04-07 Weber-Hydraulik GmbH Unite hydraulique pour outils de sauvetage hydraulique, et equipe d'outil de sauvetage
US11273547B2 (en) 2017-06-12 2022-03-15 Weber-Hydraulik Gmbh Hydraulic unit for hydraulic rescue tools, and rescue tool equipped therewith
US11738440B2 (en) 2017-06-12 2023-08-29 Weber-Hydraulik Gmbh Hydraulic unit for hydraulic rescue tools, and rescue tool equipped therewith

Also Published As

Publication number Publication date
DE59407023D1 (de) 1998-11-05
WO1996004107A1 (fr) 1996-02-15
DE4323574C1 (de) 1994-11-24
EP0783395A1 (fr) 1997-07-16
ATE171661T1 (de) 1998-10-15

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