EP0087794B1 - Hydraulische Versorgungseinheit - Google Patents

Hydraulische Versorgungseinheit Download PDF

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Publication number
EP0087794B1
EP0087794B1 EP83101948A EP83101948A EP0087794B1 EP 0087794 B1 EP0087794 B1 EP 0087794B1 EP 83101948 A EP83101948 A EP 83101948A EP 83101948 A EP83101948 A EP 83101948A EP 0087794 B1 EP0087794 B1 EP 0087794B1
Authority
EP
European Patent Office
Prior art keywords
pump
tank
conduits
mouth
hydraulic
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
Application number
EP83101948A
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English (en)
French (fr)
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EP0087794A2 (de
EP0087794A3 (en
Inventor
Gian Luigi Gamberini
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AT83101948T priority Critical patent/ATE24027T1/de
Publication of EP0087794A2 publication Critical patent/EP0087794A2/de
Publication of EP0087794A3 publication Critical patent/EP0087794A3/en
Application granted granted Critical
Publication of EP0087794B1 publication Critical patent/EP0087794B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
    • F15B7/005—With rotary or crank input
    • F15B7/006—Rotary pump input

Definitions

  • This invention relates to a hydraulic power unit particularly adapted for hydraulic actuating circuits of double-acting hydraulic actuators or reversible-movement users, and comprising a reversible pump, a tank for the hydraulic liquid, and valves for connecting the pump to the tank, in which unit the pump may be selectively driven in either direction by means of a reversible electric motor, while the two mouths of the pump, each of which can operate alternately as a suction mouth and as a delivery mouth, are each connected or connectible at one side to the user and at the other side to the tank for the hydraulic liquid, either by means of an associated unidirectional valve opening only in the direction of the flow from the tank to the respective mouth, or parallelly with said unidirectional valve, by means of an associated automatic pressure relief valve.
  • a hydraulic power unit of this kind is known from "AUTOMATION", vol. 13, No. 2, February 1966, pages 102-104.
  • the body of this hydraulic power unit comprises an upper section containing two mouths for connection to the user and two unidirectional valves, and containing also a directional control valve spool. Downwardly extending from this upper section are a lateral section containing two relief valves and a central section containing the gear pump and two other unidirectional valves. Both the lateral section and the central section communicate with the tank for the hydraulic liquid which is formed by a lower cup-like section connected to the rest of the hydraulic power unit body.
  • the electric motor for driving the gear pump is sideways attached to the lateral section.
  • the aim of the invention is to provide a hydraulic power unit of the above-disclosed type, which is still more compact and small-sized than the known hydraulic power units, while guaranteeing a great safety in operation and a high reliability in time, jointly with a considerably simple construction.
  • the illustrated power unit is designed to operate a hydraulic circuit for activating, for example, a double-acting hydraulic actuating cylinder (not shown).
  • the power unit comprises an oil tank H and a reversible oil pump A, that is a pump capable of delivering oil when actuated in either direction.
  • said reversible pump A is constituted by a gear pump.
  • the two mouths B and B' of this reversible pump A therefore, can each operate, alternately, as a delivery mouth and as a suction mouth.
  • the pump A is activated by a reversible electric motor 1, either D.C.-operated or A.C.-operated, of which the direction of rotation may be selected, for example, by means of an electric switch (not shown).
  • the two mouths B and B' of the reversible pump A are connected to an oil tank H, each through the associated branch D and D' of a closed circuit communicating with the tank H through a common communication conduit G.
  • a unidirectional valve F and F' Interposed in each branch D, D' of said circuit, at opposite sides of their common conduit G for communication with the oil tank H, is a unidirectional valve F and F' which opens in the direction of flow from the oil tank toward the respective mouth B or B' of the pump A, while it closes in the opposite direction.
  • the two unidirectional valves F, F' also prevent the oil delivered through a mouth B or B' of the pump A from reaching the other mouth B' or B.
  • the two mouths B, B' of the pump A are also connected each to the associated branch M and M' of a second closed circuit, parallel to the first closed circuit D, D' and communicating with the oil tank H through the same communication conduit G, to which it is connected at N.
  • an automatic pressure relief valve L, L' Interposed in each branch M, M' of said second circuit is an automatic pressure relief valve L, L' designated also "maximum pressure valve".
  • the oil tank H communicates with a filling or connection conduit P the mouth of which is closed by a plug Q.
  • each mouth B and B' of the pump A is connected to the hydraulic actuating cylinder by a respective conduit C, C' derived from the respective branch D, D' of the first closed circuit.
  • the unidirectional valves F, F' are designed so that, though opening in the direction of flow from the tank H to the associated mouth B, B' of the pump A, they permit a limited seepage of oil also in the opposite direction, that is from the respective mouth B, B'to the tank H.
  • the pressure relief valves L and L' though opening at a pre-established maximum pressure, may be designed so as to permit - also in their closed position - a limited seepage of oil from the respective mouth B, B' to the tank H.
  • the above portion of the power unit can be used, as such, in hydraulic circuits for activating double-acting actuating cylinders that are not to be locked in position by the aid of said hydraulic circuit.
  • the pressurized oil is delivered through the conduit C to the hydraulic actuating cylinder onto one side of its piston, which, therefore, is moved in the corresponding direction, while the oil discharged from the actuating cylinder at the other side of its piston is returned through the conduit C' to the other mouth B' of the pump, operating as a suction mouth.
  • the mouth B' draws the difference from the oil tank H through the associated unidirectional valve F'.
  • the amount of oil returned from the actuating cylinder through the conduit C' is greater than that being sucked by the mouth B', a higher pressure is created on the side of the latter and the exceeding oil is returned to the tank H either by seeping through valves F' or L' or by partially opening the pressure relief valve L'.
  • the direction of rotation of the actuating motor 1 for the pump A is reversed, which pump is then activated in the opposite direction, whereby its mouth B' becomes a delivery mouth.
  • the flow of oil is then reversed, while any possible difference of rate between the flow of oil sent to the actuating cylinder and the flow of oil returned from the actuating cylinder is compensated for as described above.
  • the oil tank H substantially, has the only function to compensate for any difference of rate between the oil flow sent to the user and the oil flow returned from the user, whereby it may be of very small size and integrated with a structure of minimum dimensions, as described hereinafter.
  • the plug Q may be removed and the mouth of the connection conduit P may be connected to a supplementary oil tank.
  • a pilot conduit S opening into a pressure chamber formed at an end portion of the distributor sliding valve R, acted upon by the return spring T.
  • a pilot conduit S' opening into a pressure chamber formed at the other end portion of the distributor sliding valve R, acted upon by the return spring T'.
  • the distributor sliding valve R is thus moved to a first opening position wherein it connects the two conduits C and C' to the conduits C" and C"', whereby the delivery pressure created through the mouth B is allowed to act in the end portion of the hydraulic actuating cylinder connected to the conduit C", while the other end portion of the actuating cylinder is connected through the conduit C"' to the suction mouth B' of the pump.
  • the piston of the actuating cylinder is moved accordingly.
  • the pump A is then stopped, so as to eliminate the pressure acting through the pilot conduit S on the distributor sliding valve R and the latter is returned by the spring T' to its intermediate rest and closure position, wherein it locks the piston of the actuating cylinder in the position it has reached.
  • the delivery of the oil occurs through the mouth B' of said pump and the delivery pressure created in the conduit C' acts entirely or partially through the pilot conduit S' in the pressure chamber at the other end portion of the distributor sliding valve R acted upon by the return spring T'.
  • the pressure chamber at the opposite end of the distributor sliding valve R communicates through the pilot conduit S and conduit C with the mouth B of the pump, which operates now as a suction mouth.
  • the distributor sliding valve R is then moved against the action of the spring T in the direction of the arrow U 1 (upwardly in Fig. 1 and toward the left in Fig. 6) to a second opening position, where it again communicates the conduits C and C' to the conduits C" and C"'.
  • the pressurized oil delivered by the mouth B' acts in the other end portion of the hydraulic actuating cylinder, connected to the conduit C"', while the opposite end of said actuating cylinder is connected through the conduit C" to the suction mouth B of the pump A.
  • the piston of the actuating cylinder is then moved in a direction opposite to the former and is locked in its new position when the pump A is stopped and the distributor sliding valve R is moved back to its intermediate closure position by the action of the return spring T.
  • the distributor sliding valve R may be selectively and also manually moved to either of its two opening positions, wherein it connects the mouths B and B' of the pump A through the respective conduits C, C' to the two conduits C", C"'.
  • a control stem Z provided with a side notch 19 cooperating with a corresponding small spring-urged retainer ball 20.
  • Said stem Z sealingly exits from the recess in the distributor sliding valve R and its outer end is provided with a transverse end cutout Z', wherein a screw-driver or the like can be engaged.
  • the control stem Z is retracted outwards in a rest position, shown in Fig. 6 and wherein it does not interfere with the distributor sliding valve R when the latter is moved to its opening end position near said control stem Z (to the right in Fig. 6).
  • the pump A is constituted by a reversible gear pump.
  • the two gears 7 and 7' are arranged, in a known manner, between two opposed dual-wear-bushings 6 and 6', wherein the shafts 8 and 8' of said gears 7 and 7' are supported.
  • the dual bushings 6, 6' and the two gears 7, 7' interposed therebetween are accommodated in a corresponding recess of the pump body 5 which is sealingly tightened between the two covers 3 and 4 by means of tierods 10 passed through the pump body 5 and through the two covers 3 and 4.
  • the two covers 3 and 4 of the pump are formed by circular plates of such a diameter as to extend beyond the outline of the pump body 5.
  • the two covers are sealingly peripherally connected by an intermediate tubular member 12 and seals 13, 13' and thus form, together with said tubular member 12, around the pump body 5, a closed chamber constituting the oil tank H.
  • the circular plates constituting the covers 3 and 4 will mate by means of planar surfaces against the corresponding end faces of the pump body 5 and against the outer ends of the dual wear-bushings 6, 6' and are provided with gaskets 17 which are indicated by hatching in Fig. 4.
  • These gaskets extend all around the bushings 6, 6' at the pump body 5 and around the shafts 8, 8' of the two gears 7, 7' at the wear-bushings 6, 6', while defining at the intermediate portion between the two shafts 8, 8' and on the side of the cover 4, two opposite chambers 18, 18' operating alternately, one as a delivery chamber and the other as a suction chamber, and vice versa, according to the direction of operation of the pump A.
  • These two chambers 18, 18' communicate with opposite sides of the meshing region of the two gears 7, 7' through corresponding openings 16B and 16B' formed between the pump body 5 and the dual wear-bushing 6 on the side facing towards the cover 4.
  • Said openings 16B and 16B' constitute the two mouths of the pump, operating alternately one as a delivery mouth and the other as a suction mouth, and vice versa, according to the direction of operation of the pump A.
  • the two chambers 18, 18' also communicate each with a hole formed in the cover 4. These holes constitute the conduits D and D' and extend by means of co-axial lengths C, C' to the distributor sliding valve R which is accommodated in a corresponding substantially diametral bore formed in said cover 4. Two parallel holes extend from the distributor sliding valve R and open at the outer end surface of the cover 4 and constitute the conduits or connectors C", C"' for coupling the power unit to the respective hydraulic circuit user, for example a hydraulic actuating cylinder.
  • two parallel holes M, M' are formed the diameter of which is reduced by steps as they extend inwards, and which intersect the two holes D and D'.
  • the larger diameter outer portion of these holes M, M' accommodates the two pressure relief valves L, L', while the reduced diameter inner portion thereof, at the opposite side with respect to the intersection with the holes D, D', accommodates the unidirectional valves F, F' as particularly clearly shown in Figs. 2 and 5.
  • the inner ends of the holes M, M' communicate at N with each other and with an adjacent angular hole G opening at the inner end surface of the cover 4 in the oil tank H, thus communicating said holes M, M' with said tank H.
  • the first stretch of the hole G extends to open at the periphery of the cover 4, where it is closed by means of a plug.
  • This extension of the first stretch of the angular hole G constitutes the conduit P for connection to a supplementary oil tank.
  • the intermediate tubular member 12 is provided at the periphery thereof with a filling hole which is closed by means of a threaded plug 14 having a filling and compensating small valve 15 in the form of a non-return valve which opens from the outside towards the interior.
  • the constructional embodiment of the power unit according to the Figs. 2 to 6 ensures a compact and small-sized unit containing the pump A, the oil tank H and every required auxiliary elements and is easily secured to the flange 101 of the reversible actuating electric motor 1 by means of the cover 3 and axial connecting tierods 11 passed through the two covers 3, 4 and through the oil tank H exteriorly of the pump body 5.
  • the shaft 8 of a gear 7 exits to the outside through the cover 3 and a sealing member 9, and is coupled to the co-axial shaft 2 of the motor 1.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Braking Systems And Boosters (AREA)
  • Control Of Transmission Device (AREA)

Claims (5)

1. Hydraulische Versorgungseinheit, insbesondere für hydraulische Umlaufsysteme doppeltwirkender Hydroantriebe oder in ihrer Bewegung umkehrbarer Verbraucher, bestehend aus einer umkehrbaren Zahnradpumpe (A), einem Tank (H) für die hydraulische Flüssigkeit und Ventilen (F, F', L, L') zum Anschluß der Pumpe (A) an den Tank (H), wobei die Pumpe (A) dieser Einheit mittels eines umkehrbaren Elektromotors (1) wahlweise in jede Richtung antreibbar ist, während die beiden Öffnungen (B, B') der Pumpe (A), von denen jede wechselweise als Saugöffnung oder als Drucköffnung wirken kann, jeweils an einer Seite mit dem Verbraucher (Leitungen C, C' oder C", C"') und an der anderen Seite mit dem Tank (H) für die hydraulische Flüssigkeit verbunden oder zu verbinden sind und zwar entweder mittels eines zugeordneten Einwegeventils (F, F'), welches nur in der Strömungsrichtung vom Tank (H) zur jeweiligen Öffnung (B, B') öffnet, oder parallel zu diesen Einwegeventilen (F, F') mittels eines zugeordneten automatischen Überdruckventils (L, L'), dadurch gekennzeichnet, daß der Körper (5) der Pumpe (A) zusammen mit einem rohrförmigen Zwischenglied (12) zwischen zwei Deckeln (3, 4) eingespannt ist, wobei das Zwischenglied (12) zusammen mit den Deckeln (3, 4) um den Pumpenkörper (5) herum eine abgeschlossene, den Tank (H) darstellende Ringkammer bildet, einer (3) dieser Deckel am Antriebsmotor (1) befestigt ist und der andere (4) dieser Deckel die Einwegeventile (F, F') und die Überdruckventile (L, L') enthält.
2. Versorgungseinheit nach Anspruch 1, dadurch gekennzeichnet, daß der die Einwegeventile (F, F') und die Überdruckventile (L, L') enthaltende Deckel (4) mit Leitungskanälen (D, D' und M, M') versehen ist, welche zwei geschlossene Kreisläufe bilden, wobei die Einwegeventile (F, F') in einem (D, D') dieser geschlossenen Kreisläufe und die Überdruckventile (L, L') in dem anderen geschlossenen Kreislauf (M, M') angeordnet sind, ein Verbindungskanal (G) die Leitungskanäle (D, D' und M, M') mit der den Tank (H) bildenden Kammer verbindet und Verbindungsleitungen (C, C') die Leitungskanäle (D, D' und M, M') mit dem Verbraucher verbinden.
3. Versorgungseinheit nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß der die Einwegeventile (F, F') und die Überdruckventile (L, L') enthaltende Deckel (4) mit einem hydraulischen Wegeventil (R) versehen ist, das zwischen den beiden Öffnungen (B, B') der Pumpe (A) und zwei mit dem Verbraucher verbundenen Leitungen (C", C"') angeordnet ist, von denen wechselweise die eine als Zuleitung und die andere als Rückleitung dient bzw. umgekehrt, wobei das Wegeventil (R) durch Rückstellfedern (T, T') in eine mittlere Schließ- und Riegelstellung gedrückt wird, in der die Verbindung zwischen den zwei Öffnungen (B, B') der Pumpe (A) und den zwei dem Anschluß an den Verbraucher dienenden Leitungen (C", C"') versperrt ist, während es mittels eines Steuerdrucks (Steuerleitungen S, S'), der von der als Speiseöffnung wirkenden Öffnung der Pumpe abgeleitet ist, in eine der beiden Richtungen bewegt wird und dabei in eine der beiden Offen- und Antriebsstellungen gelangt, in der es die beiden Öffnungen (B, B') der Pumpe (A) mit den dem Anschluß an den Verbraucher dienenden Leitungen (C", C"') verbindet.
4. Versorgungseinheit nach Anspruch 3, gekennzeichnet durch Mittel (Z, Z', 19, 20), durch welche das Wegeventil (R) von Hand in eine seiner Offen- und Antriebsstellungen bewegbar und in dieser Stellung feststellbar ist.
5. Versorgungseinheit nach Anspruch 1, dadurch gekennzeichnet, daß der Tank (H) für die hydraulische Flüssigkeit mit einer Leitung (P) verbunden ist, deren Öffnung in der Regel mittels eines Stopfens (Q) verschlossen ist und an einen Zusatztank für hydraulische Flüssigkeit anschließbar ist.
EP83101948A 1982-03-02 1983-02-28 Hydraulische Versorgungseinheit Expired EP0087794B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83101948T ATE24027T1 (de) 1982-03-02 1983-02-28 Hydraulische versorgungseinheit.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT335382 1982-03-02
IT03353/82A IT1156552B (it) 1982-03-02 1982-03-02 Centralina idraulica miniaturizzata con pompa a doppio senso di rotazione

Publications (3)

Publication Number Publication Date
EP0087794A2 EP0087794A2 (de) 1983-09-07
EP0087794A3 EP0087794A3 (en) 1984-09-05
EP0087794B1 true EP0087794B1 (de) 1986-12-03

Family

ID=11105531

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83101948A Expired EP0087794B1 (de) 1982-03-02 1983-02-28 Hydraulische Versorgungseinheit

Country Status (4)

Country Link
EP (1) EP0087794B1 (de)
AT (1) ATE24027T1 (de)
DE (1) DE3368096D1 (de)
IT (1) IT1156552B (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2239488B (en) * 1989-12-19 1993-11-03 Marinex Ind Limited Hydraulic actuator for marine drives
FR2687206B1 (fr) * 1992-02-12 1995-06-16 Berruyer Jean Jacques Dispositif de commande pour vannes.
NL9401692A (nl) * 1994-10-13 1996-05-01 Applied Power Inc Hydraulische bedieningsinrichting en versnellingsbak voorzien van een dergelijke bedieningsinrichting.
US5778671A (en) * 1996-09-13 1998-07-14 Vickers, Inc. Electrohydraulic system and apparatus with bidirectional electric-motor/hydraulic-pump unit
EP1263909A2 (de) 1999-12-22 2002-12-11 ExxonMobil Chemical Patents Inc. Polypropylen klebstoffe
DE102011117486A1 (de) * 2011-10-26 2013-05-02 Getrag Getriebe- Und Zahnradfabrik Hermann Hagenmeyer Gmbh & Cie Kg Schaltanordnung für ein Kraftfahrzeuggetriebe
EP4102105B1 (de) * 2020-09-29 2025-08-13 Hitachi Construction Machinery Co., Ltd. Kraftübertragungsvorrichtung für ein fahrzeug

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2552624A (en) * 1948-09-13 1951-05-15 Frederick W Enzenbacher Door closing apparatus, including electrically driven gear pump and oscillating vanemotor hydraulic transmission
DE1916266A1 (de) * 1968-05-21 1970-10-08 Bbc Brown Boveri & Cie Elektrohydraulisches Stellgeraet
DE2656553A1 (de) * 1976-12-14 1978-06-15 Bosch Gmbh Robert Vorrichtung zum bewegen von insbesondere schwenkbaren konstruktionsteilen

Also Published As

Publication number Publication date
EP0087794A2 (de) 1983-09-07
IT1156552B (it) 1987-02-04
ATE24027T1 (de) 1986-12-15
EP0087794A3 (en) 1984-09-05
DE3368096D1 (en) 1987-01-15
IT8203353A0 (it) 1982-03-02

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