EP0297489A2 - Hydraulically driven lifting device - Google Patents

Hydraulically driven lifting device Download PDF

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Publication number
EP0297489A2
EP0297489A2 EP88110243A EP88110243A EP0297489A2 EP 0297489 A2 EP0297489 A2 EP 0297489A2 EP 88110243 A EP88110243 A EP 88110243A EP 88110243 A EP88110243 A EP 88110243A EP 0297489 A2 EP0297489 A2 EP 0297489A2
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EP
European Patent Office
Prior art keywords
motor
pump
hoist according
chain sprocket
pistons
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Granted
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EP88110243A
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German (de)
French (fr)
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EP0297489A3 (en
EP0297489B1 (en
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Hermann Ing. Grad. Neuhaus
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Individual
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Individual
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Priority to AT88110243T priority Critical patent/ATE58511T1/en
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Publication of EP0297489B1 publication Critical patent/EP0297489B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D3/00—Portable or mobile lifting or hauling appliances
    • B66D3/18—Power-operated hoists
    • B66D3/20—Power-operated hoists with driving motor, e.g. electric motor, and drum or barrel contained in a common housing
    • B66D3/22—Power-operated hoists with driving motor, e.g. electric motor, and drum or barrel contained in a common housing with variable-speed gearings between driving motor and drum or barrel

Definitions

  • the invention relates to a hydraulically driven hoist for lifting and lowering especially heavy loads which is provided with a chain sprocket arranged between the hydraulic motor and hydraulic pump or electric motor.
  • hoists are known with a hydrostatic transmission, the pumps and motors of which are designed as radial piston machines or axial piston machines.
  • Gear pumps and motors or vane pumps and motors can only be subjected to a lower pressure than piston machines.
  • Radial and axial piston machines must have a relatively large number of pistons in order to generate a low-pulsation volume flow or an approximately constant torque. Their degree of non-uniformity is about 1% with 11 pistons. (Oelhydraulik by Prof. G. Bauer, BG Teupner Verlag Stuttgart, 1982, degree of non-uniformity, pages 102-103).
  • Such a machine enables a pulsation-free flow to be generated with only a few pistons (in the minimum case two pistons for the pump and the motor) and ensures a uniform torque.
  • the invention has for its object to provide a hydraulically driven hoist, which is suitable to accommodate large loads with small dimensions and which has an improved efficiency compared to the known hoists.
  • the drive of a hoist consists of a valve-controlled hydrostatic transmission with a closed circuit and the pump and the motor of the transmission are arranged on both sides of a chain sprocket with a safety brake and on one side of the chain sprocket a gear drive, which is designed in one or two stages is, as well as a feed pump and a clutch with an electric motor are arranged.
  • the hydrostatic transmission of the hoist essentially consists of an internally loaded pump and an internally loaded motor.
  • both radial piston machines (motor and pump) each consist of only two cylinders with pistons, the motor rotating at the speed of the chain sprocket.
  • the hydraulic motor is rigidly connected to the chain sprocket by a shaft.
  • the two cylinders of the pump and motor are connected by a shaft.
  • All parts of the drive are housed in a housing and supported radially and axially.
  • the pistons of the cylinders can also be designed as multiple pistons, the pistons being separated from one another by a fixed partition.
  • the clockwise and anti-clockwise rotation of the engine is made possible by the fact that the rotating roller on the piston is guided by a double control cam. In the clockwise rotation, the outer curve and in the counterclockwise rotation the inner curve is driven off the roll.
  • the pressure oil of the pump is guided by reversing the clockwise rotation into the chamber to the right of the piston and counterclockwise rotation into the chamber to the left of the piston.
  • the pressure oil is only switched to the left when the load hook is to be lowered without a load. If the load hook is lowered with a load, this is done via a pressure relief valve (brake valve).
  • the piston rod is ball-bearing and provided on the opposite side of the piston with a ball-bearing roller that travels the control curves.
  • the volume flow generated is comparatively small (low number of pistons) and leakage losses are low even at 500 bar (ball seat valves).
  • the degree of non-uniformity in these machines with two pistons is approximately 0.7%.
  • the length of the stroke-generating curves in the working area and outside the working area is 180, 120, 90, 60 and 30 degrees.
  • the hoist according to the invention allows simple and economical manufacture.
  • the hoist also has all parts such as chains, ropes, load hooks, etc. and all parts for electrical control.
  • FIG. 1 The embodiment of a hoist shown in FIG. 1 consists of an internally loaded motor 3 and an internally loaded pump 2. Both units 2 and 3 each consist of two hydraulic cylinders, which, as can be seen from FIG. 2, are provided as multiple pistons 13 .
  • the drive shaft 11 of the motor 3 is connected to the chain sprocket 4.
  • the multiple pistons are each connected by their piston rod to a roller 18, which traverse the control curves of pump 2 and motor 3.
  • control cams 16 and 17 (FIG. 3) of pistons 13 are an involute and outside the working area are sinoids.
  • the pump 2 and the motor 3 represent the hydrostatic transmission 1 in connection with the closed circuit and its control units.
  • the pump 2 and the motor 3 of the transmission are arranged on both sides of a chain sprocket 4, the two cylinders 12 of the pump and motor being each rigidly connected to one another by a shaft 10.
  • a safety brake 5 is connected to the chain sprocket 4 or alternatively to the clutch 8 of the electric motor 9.
  • a gear drive 6 one or two stages
  • a feed pump 7 a clutch 8 and an E -Motor 9 arranged.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Hydraulic Motors (AREA)
  • Rotary Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

Lifting devices for lifting and lowering in particular heavy loads essentially consist of a chain sprocket arranged between hydraulic motor and hydraulic pump or electric motor and are of large design on account of a large number of pistons, which are required for producing a low-pulsation volumetric flow or an approximately constant torque. To provide a lifting device of small dimensions and improved efficiency, the drive for the lifting device consists of a valve-controlled, hydrostatic transmission (1) (with closed circuit), the pump (2) and the motor (3) of the transmission (1) being arranged on either side of a chain sprocket (4), and a safety brake (5), a gear drive (6) (single-stage or multi-stage) as well as a feed pump (7) and a coupling (8) with an electric motor (9) being arranged on one side of the chain sprocket (4) (Fig. 1). <IMAGE>

Description

Die Erfindung betrifft einen hydraulisch getriebenen Hebezug zum Heben und Senken von insbesondere schweren Lasten der aufhängbar mit einer zwischen Hydraulikmotor und Hydraulik­pumpe bzw. E-Motor angeordneten Kettennuß versehen ist.The invention relates to a hydraulically driven hoist for lifting and lowering especially heavy loads which is provided with a chain sprocket arranged between the hydraulic motor and hydraulic pump or electric motor.

Bekannt sind Hebezüge, mit einem hydrostatischen Getriebe, deren Pumpen und Motore im wesentlichen aus Zahnrädern und Flügelzellen bestehen.Hoists with a hydrostatic transmission are known, the pumps and motors of which essentially consist of gears and vane cells.

Desweiteren sind Hebezüge bekannt mit einem hydrostatischen Getriebe, derren Pumpen und Motore als Radialkolbenmaschinen bzw. Axialkolbenmaschinen ausgebildet sind.Furthermore, hoists are known with a hydrostatic transmission, the pumps and motors of which are designed as radial piston machines or axial piston machines.

Zahnradpumpen und Motore bzw. Flügelzellenpumpen und Motore können im Vergleich zu den Kolbenmaschinen nur mit einem geringeren Druck beaufschlagt werden. Radial- und Axiakol­benmaschinen müssen, um einen pulsationsarmen Volumenstrom bzw. ein annähernd konstantes Drehmoment zu erzeugen, eine relative große Anzahl von Kolben besitzen. Ihr Ungleichförmigkeitsgrad beträgt bei 11 Kolben etwa 1%. (Oelhydraulik v. Prof. G. Bauer, B.G. Teupner Verlag Stutt­gart, 1982, Ungleichförmigkeitsgrad, Seite 102 - 103).Gear pumps and motors or vane pumps and motors can only be subjected to a lower pressure than piston machines. Radial and axial piston machines must have a relatively large number of pistons in order to generate a low-pulsation volume flow or an approximately constant torque. Their degree of non-uniformity is about 1% with 11 pistons. (Oelhydraulik by Prof. G. Bauer, BG Teupner Verlag Stuttgart, 1982, degree of non-uniformity, pages 102-103).

Nach dem Patent DE-PS 33 47 133 ist eine Radialkolbenma­schine (Pumpe, Motor) mit mehreren Kolben mit einer den Kolbenhub erzeugenden bzw. das Drehmoment übertragenden Steuerkurve bekannt, die so gestaltet ist, daß im Arbeitsbe­reich die Summe der Geschwindigkeiten der einzelnen Kolben zu jedem Zeitpunkt einer Wellenumdrehung gleich groß ist, wobei die den Kolbenhub bzw. das Drehmoment übertragende Steuerkurve im Arbeitsbereich die äußere Form einer Evolvente aufweist und die Zylinder so angeordnet sind, daß ihre Mittellinien sich tangential an den Grundkreis der Evolvente anlegen.According to the patent DE-PS 33 47 133 a radial piston machine (pump, motor) with several pistons with a piston stroke generating or torque transmitting control curve is known, which is designed so that the sum of the speeds of the individual pistons to each in the working area The time of a shaft revolution is of the same size, the control cam transmitting the piston stroke or the torque in the working area having the outer shape of an involute and the cylinders being arranged in such a way that their center lines are tangent to the base circle of the involute.

Eine derartige Maschine ermöglicht mit nur wenigen Kolben einen pulsationsfreien Förderstrom zu erzeugen (im Minimalfall zwei Kolben für die Pumpe und den Motor) und gewährleistet ein gleichförmiges Drehmoment.Such a machine enables a pulsation-free flow to be generated with only a few pistons (in the minimum case two pistons for the pump and the motor) and ensures a uniform torque.

Der Erfindung liegt die Aufgabe zugrunde, einen hydraulisch getriebenen Hebezug zu schaffen, der geeignet ist, bei kleinen Abmessungen große Lasten aufzunehmen und der gegenüber den bekannten Hebezügen einen verbesserten Wirkungsgrad aufweist.The invention has for its object to provide a hydraulically driven hoist, which is suitable to accommodate large loads with small dimensions and which has an improved efficiency compared to the known hoists.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Antrieb eines Hebezuges aus einem ventilgesteuerten hydrostatischen Getriebe mit geschlossenem Kreislauf besteht und die Pumpe und der Motor des Getriebes beidseitig einer Kettennuß mit Sicherheitsbremse angeordnet sind und weiterhin einseitig der Kettennuß ein Zahnradtrieb, der ein- ­oder zweistufig ausgebildet ist, sowie eine Speisepumpe und eine Kupplung mit einem E-Motor angeordnet sind.This object is achieved in that the drive of a hoist consists of a valve-controlled hydrostatic transmission with a closed circuit and the pump and the motor of the transmission are arranged on both sides of a chain sprocket with a safety brake and on one side of the chain sprocket a gear drive, which is designed in one or two stages is, as well as a feed pump and a clutch with an electric motor are arranged.

Das hydrostatische Getriebe des Hebezuges besteht im wesent­lichen aus einer innen beaufschlagten Pumpe und aus einem innen beaufschlagten Motor. Beide Radialkolbenmaschinen (Motor und Pumpe) bestehen im Minimalfall jeweils nur aus zwei Zylindern mit Kolben, wobei der Motor mit der Drehzahl der Kettennuß umläuft. Der Hydraulikmotor ist durch eine Welle mit der Kettennuß starr verbunden. Ebenso sind die beiden Zylinder von Pumpe und Motor unter sich durch eine Welle verbunden.The hydrostatic transmission of the hoist essentially consists of an internally loaded pump and an internally loaded motor. In the minimum case, both radial piston machines (motor and pump) each consist of only two cylinders with pistons, the motor rotating at the speed of the chain sprocket. The hydraulic motor is rigidly connected to the chain sprocket by a shaft. Likewise, the two cylinders of the pump and motor are connected by a shaft.

Alle Teile des Antriebes sind in einem Gehäuse untergebracht und radial und axial gelagert. Die Kolben der Zylinder können auch als Mehrfachkolben ausgebildet sein, wobei die Kolben durch eine feststehende Zwischenwand voneinander getrennt sind.All parts of the drive are housed in a housing and supported radially and axially. The pistons of the cylinders can also be designed as multiple pistons, the pistons being separated from one another by a fixed partition.

Der Rechts- und Linkslauf des Motors wird dadurch möglich, daß die umlaufende Rolle am Kolben von einer doppelten Steuerkurve geführt wird. Beim Rechtslauf wird die äußere und beim Linkslauf die innere Kurve von der Rolle abgefahren. Das Drucköl der Pumpe wird hierbei durch Umsteuern bei Rechtslauf in die Kammer rechts vom Kolben und bei Linkslauf in die Kammer links vom Kolben geführt.The clockwise and anti-clockwise rotation of the engine is made possible by the fact that the rotating roller on the piston is guided by a double control cam. In the clockwise rotation, the outer curve and in the counterclockwise rotation the inner curve is driven off the roll. The pressure oil of the pump is guided by reversing the clockwise rotation into the chamber to the right of the piston and counterclockwise rotation into the chamber to the left of the piston.

Das Umsteuern des Drucköles zum Linkslauf erfolgt nur dann, wenn der Lasthaken ohne Last abgesenkt werden soll. Wird der Lasthaken mit Last abgesenkt, erfolgt das über ein Überdruckventil (Bremsventil).The pressure oil is only switched to the left when the load hook is to be lowered without a load. If the load hook is lowered with a load, this is done via a pressure relief valve (brake valve).

Dadurch, daß die Mittellinien der Kolben und Zylinder zu jeder Zeit senkrecht auf die Tangente der huberzeugenden Arbeitskurve stehen und sich tangential an den Grundkreis der Evolvente anlegen, ergeben sich keine Komponenten, deren Kräfte sich in Reibungsverluste umsetzen würden, sondern die eingeleitete Kraft wird uneingeschränkt zur Erzeugung eines Druckvolumens bzw. Drehmomentes genutzt. Desweiteren ist keine Pleuelstange erforderlich und die oszilierenden Massenkräfte entfallen.Because the center lines of the pistons and cylinders are perpendicular to the tangent of the stroke-generating working curve at all times and lie tangentially to the base circle of the involute, there are no components whose forces would translate into friction losses, but the force introduced becomes unrestricted Generation of a pressure volume or torque used. Furthermore, no connecting rod is required and the oscillating mass forces are eliminated.

Die Kolbenstange ist kugelgelagert und an der entgegengesetzten Seite des Kolbens mit einer kugelgelagerten Rolle versehen, die die Steuerkurven abfährt. Der erzeugte Volumenstrom ist vergleichsweise klein (geringe Kolbenanzahl) und die Leckverluste sind auch bei 500 bar gering (Kugelsitzventile).The piston rod is ball-bearing and provided on the opposite side of the piston with a ball-bearing roller that travels the control curves. The volume flow generated is comparatively small (low number of pistons) and leakage losses are low even at 500 bar (ball seat valves).

Der Ungleichförmigkeitsgrad beträgt bei diesen Maschinen mit zwei Kolben etwa 0,7%. Die Länge der huberzeugenden Kurven beträgt im Arbeitsbereich und außerhalb des Arbeitsbereiches 180, 120, 90, 60 und 30 Grad.The degree of non-uniformity in these machines with two pistons is approximately 0.7%. The length of the stroke-generating curves in the working area and outside the working area is 180, 120, 90, 60 and 30 degrees.

Alle angeführten Punkte führen zu einem verbesserten Gesamtwirkungsgrad. Der erfindungsgemäße Hebezug erlaubt eine einfache und wirtschaftliche Herstellung.All of the points listed lead to an improved overall efficiency. The hoist according to the invention allows simple and economical manufacture.

Der Hebezug besitzt neben allen erwähnten Teilen auch alle Teile wie Ketten, Seile, Lasthaken usw. sowie alle Teile zur elektrischen Steuerung.In addition to all the parts mentioned, the hoist also has all parts such as chains, ropes, load hooks, etc. and all parts for electrical control.

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird im folgenden näher erläutert.An embodiment of the invention is shown in the drawings and is explained in more detail below.

Es zeigen:

  • Fig. 1 eine schematische Darstellung des Hebezuges
  • Fig. 2 einen Querschnitt einer innen beaufschlagten Pumpe mit einem Mehrfachkolben
  • Fig. 3 einen Querschnitte eines innen beaufschlagten Motors mit doppelter Steuerkurve (Evolvente-Sinoide)
  • Fig. 4 Vergleich (Ungleichförmigkeitsgrad)
Show it:
  • Fig. 1 is a schematic representation of the hoist
  • Fig. 2 shows a cross section of an internally loaded pump with a multiple piston
  • 3 shows a cross section of an internally loaded motor with a double control curve (involute sinoids).
  • 4 comparison (degree of non-uniformity)

Das in Fig. 1 dargestellte Ausführungsbeispiel eines Hebe­zuges besteht aus einem innen beaufschlagten Motor 3 und einer innen beaufschlagten Pumpe 2. Beide Aggregate 2 und 3 bestehen jeweils aus zwei Hydraulikzylindern, die, wie aus Fig. 2 zu entnehmen ist, als Mehrfachkolben 13 versehen sind. Die Antreibswelle 11 des Motors 3 ist mit der Kettennuß 4 verbunden. Die Mehrfachkolben sind durch ihre Kobenstange jeweils mit einer Rolle 18 verbunden, die die Steuerkurven von Pumpe 2 und Motor 3 abfahren.The embodiment of a hoist shown in FIG. 1 consists of an internally loaded motor 3 and an internally loaded pump 2. Both units 2 and 3 each consist of two hydraulic cylinders, which, as can be seen from FIG. 2, are provided as multiple pistons 13 . The drive shaft 11 of the motor 3 is connected to the chain sprocket 4. The multiple pistons are each connected by their piston rod to a roller 18, which traverse the control curves of pump 2 and motor 3.

Im Arbeitsbereich von Pumpe 2 und Motor 3 sind die Steuerkurven 16 und 17 (Fig. 3) der Kolben 13 eine Evolvente und außerhalb des Arbeitsbereiches eine Sinoide. Die Pumpe 2 und der Motor 3 stellen in Verbindung mit dem geschlossenen Kreislauf und seinen Steuereinheiten das hydrostatische Getriebe 1 dar.In the working area of pump 2 and motor 3, control cams 16 and 17 (FIG. 3) of pistons 13 are an involute and outside the working area are sinoids. The pump 2 and the motor 3 represent the hydrostatic transmission 1 in connection with the closed circuit and its control units.

Die Pumpe 2 und der Motor 3 des Getriebes sind beidseitig einer Kettennuß 4 angeordnet, wobei die beiden Zylinder 12 von Pumpe und Motor jeweils durch eine Welle 10 starr miteinander verbunden sind.The pump 2 and the motor 3 of the transmission are arranged on both sides of a chain sprocket 4, the two cylinders 12 of the pump and motor being each rigidly connected to one another by a shaft 10.

Zur Sicherheit bei Stromausfall ist eine Sicherheitsbremse 5 mit der Kettennuß 4 verbunden oder alternativ mit der Kupplung 8 des E-Motors 9. Einseitig der Kettennuß 4 ist ein Zahnradtrieb 6 (ein- oder zweistufig) sowie eine Speisepumpe 7, eine Kupplung 8 und ein E-Motor 9 angeordnet. 1 Hydrostatisches Getriebe
2 Hydraulikpumpe
3 Hydraulikmotor
4 Kettennuß
5 Sicherheitsbremse
6 Zahnradtrieb
7 Speisepumpe
8 Kupplung
9 E-Motor
10 Welle zwischen zwei Hylindern von Pumpe und Motor
11 Welle zwischen Motor und Ketennuß
12 Zylinder vom Pumpe und Motor 13 Kolben vom Pumpe und Motor mit Kolbenstange (als Mehrfachkolben)
14 Trennwand
15 Gleitdichtung
16 Feststehende Steuerkurve Evolvente und Sinoide
17 Feststehende Steuerkurve Evolvente und Sinoide (als Doppelkurve)
18 Rolle zum Abfahren der Steuerkurven
19 Gehäuse
For safety in the event of a power failure, a safety brake 5 is connected to the chain sprocket 4 or alternatively to the clutch 8 of the electric motor 9. On one side of the chain sprocket 4 is a gear drive 6 (one or two stages) as well as a feed pump 7, a clutch 8 and an E -Motor 9 arranged. 1 hydrostatic transmission
2 hydraulic pump
3 hydraulic motor
4 chain sprocket
5 safety brake
6 gear drive
7 feed pump
8 clutch
9 electric motor
10 shaft between two cylinders of pump and motor
11 shaft between the motor and the ketnut
12 cylinders from the pump and motor 13 pistons from the pump and motor with piston rod (as multiple pistons)
14 partition
15 sliding seal
16 Fixed control curve involutes and sinoids
17 Fixed control curve involutes and sinoids (as a double curve)
18 Roller for driving the control curves
19 housing

Claims (12)

1. Hebezug zum Heben und Senken von insbesondere schweren Lasten der aufhängbar mit einer zwishchen Hydraulikmotor und Hydraulikpumpe bzw. E-Motor angeordneten Kettennuß versehen ist, dadurch gekennzeichnet, daß der Antrieb eines Hebezuges aus einem ventilgesteuerten hydrostatishcen Getriebe (1) mit geschlossenem Kreislauf besteht und die Pumpe (2) und der Motor (3) des Getriebes (1) beidseitig einer Kettennuß (4) und einseitig der Kettennuß (4) eine Sicherheitsbremse (5) ein Zahnradtrieb (6) (ein- oder mehrstufig) sowie eine Speisepumpe (7) und eine Kupplung (8) mit einem E-Motor (9) angeordnet sind.1. hoist for lifting and lowering especially heavy loads which is provided with a chain sprocket arranged between hydraulic motor and hydraulic pump or electric motor, characterized in that the drive of a hoist consists of a valve-controlled hydrostatic transmission (1) with a closed circuit and the pump (2) and the motor (3) of the transmission (1) on both sides of a chain sprocket (4) and on one side of the chain sprocket (4) a safety brake (5) a gear drive (6) (one or more stages) and a feed pump (7 ) and a clutch (8) with an electric motor (9) are arranged. 2. Hebezug nach Anspruch 1, dadurch gekennzeichnet, daß die Sicherheitsbremse (5) an der Kettennuß (4) angeordnet ist.2. Hoist according to claim 1, characterized in that the safety brake (5) on the chain sprocket (4) is arranged. 3. Hebezug nach Anspruch 1, dadurch gekennzeichnet, daß die Sicherheitsbremse (5) mit der Kupplung (8) des E-Motors (9) verbunden ist.3. Hoist according to claim 1, characterized in that the safety brake (5) with the clutch (8) of the electric motor (9) is connected. 4. Hebezug nach Anspruch 1, dadurch gekennzeichnet, daß die Pumpe (2) und der Motor (3) mindestens je zwei Zylinder (12) aufweisen.4. Hoist according to claim 1, characterized in that the pump (2) and the motor (3) each have at least two cylinders (12). 5. Hebezug nach Anspruch 1, dadurch gekennzeichnet, daß die Steuerkurven (17) der Zylinderkolben (13) des Motors (3) als Doppelkurve (Rechts- und Linkslauf) ausgebildet sind.5. Hoist according to claim 1, characterized in that the control curves (17) of the cylinder pistons (13) of the motor (3) are designed as a double curve (clockwise and anti-clockwise rotation). 6. Hebezug nach Anspruch 1, dadurch gekennzeichnet, daß die Länge der huberzeugenden Steuerkurven (16) (17) im Arbeitsbereich und außerhalb des Arbeitsbereiches 180, 120, 90, 60, und 30 Grad betragen.6. Hoist according to claim 1, characterized in that the length of the lifting control cams (16) (17) in the work area and outside the work area are 180, 120, 90, 60, and 30 degrees. 7. Hebezug nach Anspruch 1, dadurch gekennzeichnet, daß die Hälfte der Gesamtanzahl der Zylinder (12) und der Kolben (13) von Pumpe (2) und Motor (3) um den Wirkbereich der Arbeitskurve (in Graden gemessen) versetzt angeordnet sind.7. Hoist according to claim 1, characterized in that half of the total number of cylinders (12) and the pistons (13) of the pump (2) and motor (3) are arranged offset by the effective range of the working curve (measured in degrees). 8. Hebezug nach Anspruch 1, dadurch gekennzeichnet, daß die Zylinder (12) der Pumpe (2) und des Motors (3) jeweils durch eine Welle (10) starr miteinander und der Motor (3) außerdem durch eine Welle (11) mit der Kettennuß (4) verbunden sind.8. Hoist according to claim 1, characterized in that the cylinders (12) of the pump (2) and the motor (3) each rigidly with one another by a shaft (10) and the motor (3) also with a shaft (11) the chain nut (4) are connected. 9. Hebezug nach Anspruch 1, dadurch gekennzeichnet, daß die Kolben der Zylinder (12) von Pumpe (2) und Motor (3) als Mehrfachkolben (13) ausgebildet sind, wobei jeder Kolben durch eine Trennwand (14) vom nächsten Kolben getrennt ist.9. Hoist according to claim 1, characterized in that the pistons of the cylinders (12) of the pump (2) and motor (3) are designed as multiple pistons (13), each piston being separated from the next piston by a partition (14) . 10. Hebezug nach Anspruch 1, dadurch gekennzeichnet, daß alle sich drehenden Teile radial und axial in einem gemeinsamen Gehäuse (19) gelagert sind.10. Hoist according to claim 1, characterized in that all rotating parts are mounted radially and axially in a common housing (19). 11. Hebezug nach Anspruch 1, dadurch gekennzeichnet, daß an Stelle der Kettennuß (5) eine Seiltrommel vorgesehen ist.11. Hoist according to claim 1, characterized in that a rope drum is provided instead of the chain sprocket (5). 12. Hebezug nach Anspruch 1, dadurch gekennzeichnet, daß an Stelle der Gleitdichtungen (15) Rolldichtungen eingesetzt sind.12. Hoist according to claim 1, characterized in that roller seals are used in place of the sliding seals (15).
EP88110243A 1987-07-02 1988-06-28 Hydraulically driven lifting device Expired - Lifetime EP0297489B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88110243T ATE58511T1 (en) 1987-07-02 1988-06-28 HYDRAULICALLY POWERED HOIST.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873721878 DE3721878A1 (en) 1987-07-02 1987-07-02 HYDRAULIC LIFTING
DE3721878 1987-07-02

Publications (3)

Publication Number Publication Date
EP0297489A2 true EP0297489A2 (en) 1989-01-04
EP0297489A3 EP0297489A3 (en) 1989-07-05
EP0297489B1 EP0297489B1 (en) 1990-11-22

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EP88110243A Expired - Lifetime EP0297489B1 (en) 1987-07-02 1988-06-28 Hydraulically driven lifting device

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EP (1) EP0297489B1 (en)
AT (1) ATE58511T1 (en)
DE (2) DE3721878A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR582317A (en) * 1924-06-03 1924-12-16 Ingersoll Rand Co Freight elevator
US2500326A (en) * 1947-03-10 1950-03-14 Keller Tool Co Two-speed hoist
US3319492A (en) * 1964-08-20 1967-05-16 Pacific Car & Foundry Co Multi-stage reduction geared winch
FR2079240A1 (en) * 1970-02-04 1971-11-12 Bbc Brown Boveri & Cie
FR2299263A1 (en) * 1975-02-03 1976-08-27 Maire Bernard Motor driven pulley block for load lifting - has chain pinion between separate housings for motor and speed reducer
FR2301741A1 (en) * 1975-02-20 1976-09-17 Renault Balancing unit for pressure fed hydrostatic transmission - has piloted relief valves augmenting input valve function
DE3503342A1 (en) * 1985-02-01 1986-08-14 SEW-EURODRIVE GmbH & Co, 7520 Bruchsal Chain hoist

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR582317A (en) * 1924-06-03 1924-12-16 Ingersoll Rand Co Freight elevator
US2500326A (en) * 1947-03-10 1950-03-14 Keller Tool Co Two-speed hoist
US3319492A (en) * 1964-08-20 1967-05-16 Pacific Car & Foundry Co Multi-stage reduction geared winch
FR2079240A1 (en) * 1970-02-04 1971-11-12 Bbc Brown Boveri & Cie
FR2299263A1 (en) * 1975-02-03 1976-08-27 Maire Bernard Motor driven pulley block for load lifting - has chain pinion between separate housings for motor and speed reducer
FR2301741A1 (en) * 1975-02-20 1976-09-17 Renault Balancing unit for pressure fed hydrostatic transmission - has piloted relief valves augmenting input valve function
DE3503342A1 (en) * 1985-02-01 1986-08-14 SEW-EURODRIVE GmbH & Co, 7520 Bruchsal Chain hoist

Also Published As

Publication number Publication date
EP0297489A3 (en) 1989-07-05
EP0297489B1 (en) 1990-11-22
ATE58511T1 (en) 1990-12-15
DE3861113D1 (en) 1991-01-03
DE3721878A1 (en) 1989-01-12

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