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EP0149967B1 - Hydraulically actuated percussion tool - Google Patents

Hydraulically actuated percussion tool Download PDF

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Publication number
EP0149967B1
EP0149967B1 EP84730125A EP84730125A EP0149967B1 EP 0149967 B1 EP0149967 B1 EP 0149967B1 EP 84730125 A EP84730125 A EP 84730125A EP 84730125 A EP84730125 A EP 84730125A EP 0149967 B1 EP0149967 B1 EP 0149967B1
Authority
EP
European Patent Office
Prior art keywords
piston
percussion
control valve
valve
stroke
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
EP84730125A
Other languages
German (de)
French (fr)
Other versions
EP0149967A1 (en
Inventor
Wilhelm Dipl.-Ing. Rode
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.)
Rudolf Hausherr & Soehne & Co KG GmbH
Original Assignee
Rudolf Hausherr & Sohne & Co KG GmbH
Rudolf Hausherr and Sohne GmbH and Co KG
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 Rudolf Hausherr & Sohne & Co KG GmbH, Rudolf Hausherr and Sohne GmbH and Co KG filed Critical Rudolf Hausherr & Sohne & Co KG GmbH
Priority to AT84730125T priority Critical patent/ATE37315T1/en
Publication of EP0149967A1 publication Critical patent/EP0149967A1/en
Application granted granted Critical
Publication of EP0149967B1 publication Critical patent/EP0149967B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/14—Control devices for the reciprocating piston
    • B25D9/145—Control devices for the reciprocating piston for hydraulically actuated hammers having an accumulator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/14—Control devices for the reciprocating piston
    • B25D9/16—Valve arrangements therefor
    • B25D9/20—Valve arrangements therefor involving a tubular-type slide valve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2209/00—Details of portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D2209/005—Details of portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously having a tubular-slide valve, which is coaxial with the piston

Definitions

  • the invention relates to a hydraulically operated impact device according to the preamble of patent claim 1.
  • a hydraulically operated impact device in which the control valve is displaceable in one direction by the moving piston, responds to the movement of the piston in the opposite direction and is then actuated by the hydraulic fluid in such a way that it moves in the opposite direction due to hydrostatic pressure.
  • the control valve is arranged on the side facing the striking tool. This arrangement has the disadvantage that the mass of the valve has to be moved during the entire working stroke. This hinders the acceleration of the percussion piston.
  • control valve travels a longer way than the control piston.
  • control valve On the other hand, the long way of the control valve means that the control valve must be caught. This leads to an undesired heating of the hydraulic medium. In addition, an undesired large oil volume is required to switch the control valve.
  • the control valve is guided inside and outside in order to obtain the chambers required for the return. Since tight manufacturing tolerances are required, high manufacturing costs will arise for this. Here, too, premature wear can occur due to transverse movements of the percussion piston.
  • the object of the present invention is to provide a striking device of the type described, which adapts the speed of the control process to the nature of the object to be struck in a substantially simplified control system and by taking advantage of the oil pressure rise when the striking piston strikes the striking tool.
  • control valve consists of a simple sleeve without transverse bore, which is reversed hydraulically in the stroke stroke and mechanically in the upward stroke as a function of the path and speed of the impact piston.
  • the control valve is held hydraulically in defined positions in the housing, except during the changeover process.
  • the control channel to the control valve is released and remains open at the beginning of the backward movement.
  • the tool and the object to be struck could be viewed like a spring system.
  • the nature of the object has an impact on the rebound speed. If, for example, hard rock is struck, the path to a standstill of the piston is almost zero. In contrast to the impact on soft rock, hard rock has a high rebound speed of the percussion piston and a momentary pressure increase in the oil column. Since this pressure is used to reverse the control valve, the reversing process for hard objects is faster as desired.
  • Another advantage of the invention is the simple structure of the impact device. Except for the control edges, the control valve has a diameter almost the same size as the cylinder of the percussion piston.
  • the housing has predominantly simple cylindrical bores for receiving the percussion piston.
  • the structure of the percussion piston is simple in terms of production technology and has the advantage that the contact surfaces to the housing are so far apart that no one strikes the percussion tool Wear of the piston guide occurs.
  • Another advantage of the striking device is the easy interchangeability of the piston. Since the diameter of the guide cylinder of the percussion piston is smaller than the inner diameter of the sleeve-shaped control valve, z. B. for repair purposes, the percussion piston can be replaced without dismantling the control valve.
  • the invention is based on drawings a schematically illustrated impact device explained in more detail.
  • the striking device consists of the housing 2, the striking piston 3 and the control valve 4, an impact tool 1, such as a chisel, drill or the like, being introduced axially into the housing on which the axially reciprocating percussion piston acts.
  • an impact tool 1 such as a chisel, drill or the like
  • Fig. 1 the percussion piston 3 has performed the blow.
  • the control edge 3.3 of the guide cylinder 3 "has opened the outlet 7.1 of the connecting channel 7.
  • the pressure oil has entered the annular space 8.2 via the feed 7.2 and has moved the control valve 4 in the direction of the striking tool 1 and the annular surface via the annular surface of the control edge 4.3 the control edge 4.6 of the control valve 4 against the annular surface 2.4 of the housing.
  • the oil from the annular groove 5 '" has reached the middle outlet 6.3 and the upper connection 6.4 to the oil outlet 6.
  • the annular space 5 "" is opened so that pressure oil from the pressure inlet 5 moves the control valve into the "return stroke” position via the annular surface of the control edge 4.4.
  • the control valve 4 has released the upper annular groove 6 "and the lower annular groove 6 '.
  • the oil from the inner annular space 8.1 can flow out to the oil outlet 6 via the upper drain 6.5.
  • the control valve 4 blocks the annular groove 5" and thus in this position the supply of the pressure oil via the supply 5.3 to the annular surface of the control edge 3.3.
  • the pressure of the oil present in the annular space 8.3 holds the control valve 4 in position over the annular surface of the control edge 4.4.
  • the pressure oil reaching the lower annular space 5 'via connection 5.2 and the feed 5.1 acts on the annular surface 3.1 of the cylinder 3' and moves the percussion piston in the direction of the side of the piston facing away from the percussion tool.
  • the percussion piston 3 hits the control valve 4 (FIG. 5).
  • a part of the outer wall of the pin 3.4 is pushed into the inner bore 4.2 of the control valve 4.
  • the oil located between the surfaces of the outer wall of the pin 3.4 of the ring surface 3.3 of the housing inner wall 2.1 and the ring surface of the lower edge 4.1 of the control valve 4 is enclosed in the resulting annular space.
  • the overlapping surfaces between the pin 3.4 and the inner bore 4.2 and the middle cylinder 3 "and the housing inner bore 2.1 provide sufficient sealing.
  • the sealing surface which is formed by the outer surface 4.7 and the housing inner surface 2.1 becomes smaller when the control valve 4 moves back.
  • the pressure of the oil from the annular groove 5 ′′ is present in the annular space described above.
  • the oil on the pressure side acts on the annular surface 3.3 of the percussion piston 3 and brakes its movement.
  • the control valve moves to the "stroke stroke" position (Fig. 2).
  • the pressure-side oil passes through the control edge 4.1 of the control valve 4 into the inner annular space 8.1.
  • the percussion piston is accelerated in the direction of the percussion tool, since the annular surface 3.5 is now also effective in the direction of impact in addition to the annular surface 3.3.
  • the oil of the central annular groove 5 ′′ flows through the connecting channel 7 and the annular space 3.2 to the oil outlet 6.
  • the control valve 4 in the "stroke stroke” position.
  • the control valve 4 lies with the end face 4.5 on the annular surface 2.3 of the housing 2.
  • the outflow of the oil from the annular space 8.1 into the upper drain 6.5 and the annular groove 6 "and 6 ' is prevented.
  • the pressure oil reaches the inlet 5.3 and the annular groove 5 "into space 8.1 and thus onto the end face 3.5 and 3.3 facing the striking tool and via the feed 5.1 onto the end face 3.1 of the striking piston facing the striking tool.
  • the striking piston designed as a differential piston moves in the direction of the striking tool.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Manufacture Of Iron (AREA)
  • Actuator (AREA)

Abstract

A hydraulically operated impacting device includes a differential piston slidably disposed in a bore, and having an impacting surface and a piston rod facing at the other end a valve sleeve circumscribing the piston rod, there being an annular space between the rod and the valve, the valve having a first and a second position; a first duct leads from a pressure source to the bore and is governed by the valve for acting or not acting on the larger one of the two piston surfaces respectively in the first and second positions of the valve; a second duct leads from the source to the bore for acting on the smaller one of the piston surfaces; a third duct leads from the bore at a location below the valve to a ring chamber adjacent the valve, the valve having a collar which is movable in the ring chamber, the piston has a portion which depending on the position of the piston permits or prevents communication between the annular space and the third duct to obtain or not obtain pressurization of the ring chamber for shifting the valve from the first to the second position; the piston has a collar which may enter in part the annular space during a return stroke of the piston while the remainder of the collar and the bore establish a closed chamber so that upon continuation of the return stroke the piston shifts the valve from the second position into the first position in which the valve opens the first duct for obtaining a forward and impacting stroke.

Description

Die Erfindung betrifft eine hydraulisch betätigte Schlagvorrichtung gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a hydraulically operated impact device according to the preamble of patent claim 1.

Aus der FR-A-2 317 053 ist eine hydraulisch betätigte Schlagvorrichtung bekannt, bei der das Steuerventil von dem sich bewegenden Kolben in einer Richtung verschiebbar ist, auf die Bewegung des Kolbens in entgegengesetzter Richtung anspricht und daraufhin von der Druckflüssigkeit derart betätigt wird, daß es sich durch hydrostatischen Druck in entgegengesetzte Richtung bewegt. Bei dieser Vorrichtung ist das Steuerventil auf der dem Schlagwerkzeug zugewandten Seite angeordnet. Diese Anordnung hat den Nachteil, daß während des gesamten Arbeitshubes die Masse des Ventils bewegt werden muß. Dies behindert die Beschleunigung des Schlagkolbens.From FR-A-2 317 053 a hydraulically operated impact device is known in which the control valve is displaceable in one direction by the moving piston, responds to the movement of the piston in the opposite direction and is then actuated by the hydraulic fluid in such a way that it moves in the opposite direction due to hydrostatic pressure. In this device, the control valve is arranged on the side facing the striking tool. This arrangement has the disadvantage that the mass of the valve has to be moved during the entire working stroke. This hinders the acceleration of the percussion piston.

Außerdem legt das Steuerventil einen längeren Weg zurück als der Steuerkolben. Das bedeutet zum einen, daß es sich vom Steuerkolben lösen muß, was bei unterschiedlich zu schlagenden Objekten sich verschieden vollzieht und bei weichen Objekten nicht immer gelingt. Die Folge davon ist, daß das Steuerventil und der Schlagkolben außer Takt kommen.In addition, the control valve travels a longer way than the control piston. On the one hand, this means that it has to detach itself from the control piston, which takes place differently for objects to be struck differently and which does not always succeed with soft objects. The result of this is that the control valve and the percussion piston are out of action.

Der lange Weg des Steuerventils bedeutet zum anderen, daß das Steuerventil aufgefangen werden muß. Dies führt zu einer nicht gewünschten Erwärmung des hydraulischen Mediums. Außerdem ist zum Umschalten des Steuerventils ein nicht gewünschten großes Ölvolumen erforderlich.On the other hand, the long way of the control valve means that the control valve must be caught. This leads to an undesired heating of the hydraulic medium. In addition, an undesired large oil volume is required to switch the control valve.

Das Steuerventil ist, um die zum Zurückführen erforderlichen Kammern zu erhalten, innen und außen geführt. Da enge Fertigungstoleranzen gefordert sind, werden hierfür hohe Fertigungskosten auftreten. Auch hierbei kann ein vorzeitiger Verschleiß durch Querbewegungen des Schlagkolbens auftreten.The control valve is guided inside and outside in order to obtain the chambers required for the return. Since tight manufacturing tolerances are required, high manufacturing costs will arise for this. Here, too, premature wear can occur due to transverse movements of the percussion piston.

Die Aufgabe der vorliegenden Erfindung besteht darin, eine Schlagvorrichtung der eingangs geschilderten Art zu schaffen, die bei einem wesentlich vereinfachten Steuerungssystem und unter Ausnutzung des Öldruckanstieges beim Auftreffen des Schlagkolbens auf das Schlagwerkzeug die Geschwindigkeit des Steuervorganges der Beschaffenheit des zu schlagenden Objektes anpaßt.The object of the present invention is to provide a striking device of the type described, which adapts the speed of the control process to the nature of the object to be struck in a substantially simplified control system and by taking advantage of the oil pressure rise when the striking piston strikes the striking tool.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Hauptanspruchs gelöst. Vorteilhafte Weiterbildungen sind in den Unteransprüchen beschrieben. Nach der Erfindung besteht das Steuerventil aus einer einfachen querbohrungsfreien Hülse, die im Schlaghub hydraulisch und im Aufwärtshub mechanisch in Abhängigkeit des Weges und der Geschwindigkeit des Schlagkolbens umgesteuert wird. Das Steuerventil wird, außer während des Umschaltvorgangs, hydraulisch in definierten Positionen im Gehäuse gehalten.This object is achieved according to the invention by the features of the main claim. Advantageous further developments are described in the subclaims. According to the invention, the control valve consists of a simple sleeve without transverse bore, which is reversed hydraulically in the stroke stroke and mechanically in the upward stroke as a function of the path and speed of the impact piston. The control valve is held hydraulically in defined positions in the housing, except during the changeover process.

Es ist nur ein Druckölsystem erforderlich.Only one pressure oil system is required.

Kurz vor dem Auftreffen des Schlagkolbens auf das Schlagwerkzeug wird der Steuerkanal zum Steuerventil freigegeben und bleibt zu Beginn der Rückwärtsbewegung offen. Werkzeug und zu schlagendes Objekt könnten theoretisch wie ein Federsystem betrachtet werden. Die Beschaffenheit des Objektes hat dabei einen Einfluß auf die Rückprallgeschwindigkeit. Wird beispielsweise auf hartes Gestein geschlagen, so ist der Weg zum Stillstand des Kolbens fast Null. Im Gegensatz zum Schlag auf Weichgestein entsteht bei hartem Gestein eine hohe Rückprallgeschwindigkeit des Schlagkolbens und ein momentaner Druckanstieg in der Ölsäule. Da dieser Druck zur Umsteuerung des Steuerventils eingesetzt wird, ist der Umsteuervorgang bei harten Objekten wunschgemäß schneller.Shortly before the impact piston hits the impact tool, the control channel to the control valve is released and remains open at the beginning of the backward movement. Theoretically, the tool and the object to be struck could be viewed like a spring system. The nature of the object has an impact on the rebound speed. If, for example, hard rock is struck, the path to a standstill of the piston is almost zero. In contrast to the impact on soft rock, hard rock has a high rebound speed of the percussion piston and a momentary pressure increase in the oil column. Since this pressure is used to reverse the control valve, the reversing process for hard objects is faster as desired.

Ein weiterer Vorteil der Erfindung ist der einfache Aufbau der Schlagvorrichtung. Das Steuerventil hat bis auf die Steuerungskanten einen fast gleich großen Durchmesser wie der Zylinder des Schlagkolbens. Das Gehäuse besitzt damit überwiegend einfache zylindrische Bohrungen zur Aufnahme des Schlagkolbens.Another advantage of the invention is the simple structure of the impact device. Except for the control edges, the control valve has a diameter almost the same size as the cylinder of the percussion piston. The housing has predominantly simple cylindrical bores for receiving the percussion piston.

Durch die Anordnung des Steuerventils um die Kolbenstange des Schlagkolbens auf der dem Schlagwerkzeug abgewandten Seite ist der Aufbau des Schlagkolbens fertigungstechnisch einfach und hat dazu den Vorteil, daß die Auflageflächen zum Gehäuse hin so weit auseinander angeordnet sind, daß auch bei nichtzentrischem Schlag auf das Schlagwerkzeug kein Verschleiß der Kolbenführung eintritt.Due to the arrangement of the control valve around the piston rod of the percussion piston on the side facing away from the percussion tool, the structure of the percussion piston is simple in terms of production technology and has the advantage that the contact surfaces to the housing are so far apart that no one strikes the percussion tool Wear of the piston guide occurs.

Das Umschalten des Steuerventils vom "Rückhub" auf "Schlaghub" wird durch den Schlagkolben am Ende seines Rückhubes mechanisch durchgeführt. Diese vorteilhafte direkte und exakte Führung des Steuerventils wird dazu noch verschleißfrei durchgeführt. Dies geschieht erfindungsgemäß dadurch, daß der Schlagkolben mit einem Zapfen in die Hülse des Steuerventils eindringt und damit Öl in einem Ringraum einschließt. Der Schlagkolben schiebt ohne direkten Kontakt mit dem hülsenförmigen Steuerventil dieses vor sich her. Kurz vor Erreichen der Position "Schlaghub" des Steuerventils wird der Schlagkolben durch das Drucköl abgebremst. Das nur mit geringer Geschwindigkeit sich bewegende Steuerventil trifft sanft auf die Stirnfläche des Gehäuses auf und wird über das Drucköl in einer Position gehalten.Switching the control valve from "return stroke" to "impact stroke" is carried out mechanically by the impact piston at the end of its return stroke. This advantageous direct and exact guidance of the control valve is also carried out without wear. This is done according to the invention in that the percussion piston penetrates into the sleeve of the control valve with a pin and thus includes oil in an annular space. The percussion piston pushes the sleeve-shaped control valve in front of it without direct contact. Shortly before reaching the "blow stroke" position of the control valve, the blow piston is braked by the pressure oil. The control valve, which only moves at low speed, hits the end face of the housing gently and is held in one position by the pressure oil.

Zum Umsteuern des Steuerventils ist insgesamt nur eine geringe Ölmenge erforderlich.Only a small amount of oil is required to reverse the control valve.

Ein weiterer Vorteil der Schlagvorrichtung ist die einfache Austauschbarkeit des Kolbens. Da der Durchmesser des Führungszylinders des Schlagkolbens kleiner ist als der Innendurchmesser des hülsenförmigen Steuerventils, kann z. B. zu Instandsetzungszwecken der Schlagkolben ohne Demontage des Steuerventils gewechselt werden.Another advantage of the striking device is the easy interchangeability of the piston. Since the diameter of the guide cylinder of the percussion piston is smaller than the inner diameter of the sleeve-shaped control valve, z. B. for repair purposes, the percussion piston can be replaced without dismantling the control valve.

Die Erfindung wird anhand von Zeichnungen einer schematisch dargestellten Schlagvorrichtung näher erläutert.The invention is based on drawings a schematically illustrated impact device explained in more detail.

Es zeigen

  • Fig. 1 eine erfindungsgemäße Schlagvorrichtung im Axialschnitt mit am Beginn des Rückhubes befindlichen Schlagkolben,
  • Fig. 2 die Schlagvorrichtung gemäß Fig. 1 mit am Beginn des Schlaghubes befindlichem Schlagkolben,
  • Fig. 3 den Schlagkolben,
  • Fig. 4 das Steuerventil,
  • Fig. 5 im Detail den Ringraum zwischen Schlagkolben, Steuerventil und Gehäuse.
Show it
  • 1 shows an impact device according to the invention in axial section with an impact piston located at the beginning of the return stroke,
  • 2 shows the impact device according to FIG. 1 with the impact piston located at the beginning of the impact stroke,
  • 3 the percussion piston,
  • 4 the control valve,
  • Fig. 5 in detail the annular space between the percussion piston, control valve and housing.

Wie Fig. 1 (ergänzend dazu Fig. 3 und 4) zeigt, besteht die Schlagvorrichtung aus dem Gehäuse 2, dem Schlagkolben 3 und dem Steuerventil 4, wobei axial in das Gehäuse ein Schlagwerkzeug 1, wie Meißel, Bohrer o. ä., eingebracht wird, auf das der sich axial hin und her bewegende Schlagkolben wirkt.As shown in FIG. 1 (in addition to this, FIGS. 3 and 4), the striking device consists of the housing 2, the striking piston 3 and the control valve 4, an impact tool 1, such as a chisel, drill or the like, being introduced axially into the housing on which the axially reciprocating percussion piston acts.

In der Fig. 1 hat der Schlagkolben 3 den Schlag ausgeführt. Die Steuerkante 3.3 des Führungszylinders 3" hat die Mündung des Ablasses 7.1 des Verbindungskanals 7 freigegeben. Über die Zuführung 7.2 ist das Drucköl in den Ringraum 8.2 gelangt und hat über die Ringfläche der Steuerkante 4.3 das Steuerventil 4 in Richtung des Schlagwerkzeuges 1 bewegt und die Ringfläche der Steuerkante 4.6 des Steuerventils 4 gegen die Ringfläche 2.4 des Gehäuses gelegt. Das Öl aus der Ringnut 5'" ist über den mittleren Ablaß 6.3 und die obere Verbindung 6.4 zum Ölauslaß 6 gelangt.In Fig. 1, the percussion piston 3 has performed the blow. The control edge 3.3 of the guide cylinder 3 "has opened the outlet 7.1 of the connecting channel 7. The pressure oil has entered the annular space 8.2 via the feed 7.2 and has moved the control valve 4 in the direction of the striking tool 1 and the annular surface via the annular surface of the control edge 4.3 the control edge 4.6 of the control valve 4 against the annular surface 2.4 of the housing. The oil from the annular groove 5 '"has reached the middle outlet 6.3 and the upper connection 6.4 to the oil outlet 6.

Über die obere Verbindung 5.4 und die obere Zuführung 5.5 ist der Ringraum 5"" geöffnet, so daß Drucköl vom Druckeinlaß 5 über die Ringfläche der Steuerkante 4.4 das Steuerventil in die Position "Rückhub" verschiebt. Das Steuerventil 4 hat dabei die obere Ringnut 6" und die untere Ringnut 6' freigegeben. Das Öl aus dem inneren Ringraum 8.1 kann über den oberen Ablaß 6.5 zum Ölauslaß 6 abfließen. Gleichzeitig versperrt in dieser Position das Steuerventil 4 die Ringnut 5" und damit die Zufuhr des Drucköles über die Zuführung 5.3 zur Ringfläche der Steuerkante 3.3. Der Druck des im Ringraum 8.3 anstehenden Öles hält das Steuerventil 4 über die Ringfläche der Steuerkante 4.4 in seiner Position.Via the upper connection 5.4 and the upper feed 5.5, the annular space 5 "" is opened so that pressure oil from the pressure inlet 5 moves the control valve into the "return stroke" position via the annular surface of the control edge 4.4. The control valve 4 has released the upper annular groove 6 "and the lower annular groove 6 '. The oil from the inner annular space 8.1 can flow out to the oil outlet 6 via the upper drain 6.5. At the same time, the control valve 4 blocks the annular groove 5" and thus in this position the supply of the pressure oil via the supply 5.3 to the annular surface of the control edge 3.3. The pressure of the oil present in the annular space 8.3 holds the control valve 4 in position over the annular surface of the control edge 4.4.

Das über die unter Verbindung 5.2 und die Zuführung 5.1 in den unteren Ringraum 5' gelangende Drucköl wirkt auf die Ringfläche 3.1 des Zylinders 3' und bewegt den Schlagkolben in Richtung der dem Schlagwerkzeug ab gewandten Seite des Kolbens. Kurz vor Ende des Rückhubes trifft der Schlagkolben 3 auf das Steuerventil 4 (Fig. 5). Ein Teil der Außenwand des Zapfens 3.4 wird in die Innenbohrung 4.2 des Steuerventils 4 geschoben. Das sich zwischen den Flächen der Außenwand des Zapfens 3.4 der Ringfläche 3.3 der Gehäuseinnenwand 2.1 und der Ringfläche der unteren Kante 4.1 des Steuerventils 4 befindende Öl wird in dem entstandenen Ringraum eingeschlossen. Die sich überdeckenden Flächen zwischen dem Zapfen 3.4 und der Innenbohrung 4.2 sowie dem mittleren Zylinder 3" und der Gehäuseinnenbohrung 2.1 dichten ausreichend ab.The pressure oil reaching the lower annular space 5 'via connection 5.2 and the feed 5.1 acts on the annular surface 3.1 of the cylinder 3' and moves the percussion piston in the direction of the side of the piston facing away from the percussion tool. Shortly before the end of the return stroke, the percussion piston 3 hits the control valve 4 (FIG. 5). A part of the outer wall of the pin 3.4 is pushed into the inner bore 4.2 of the control valve 4. The oil located between the surfaces of the outer wall of the pin 3.4 of the ring surface 3.3 of the housing inner wall 2.1 and the ring surface of the lower edge 4.1 of the control valve 4 is enclosed in the resulting annular space. The overlapping surfaces between the pin 3.4 and the inner bore 4.2 and the middle cylinder 3 "and the housing inner bore 2.1 provide sufficient sealing.

Die Dichtfläche, die gebildet wird von der Außenfläche 4.7 und der Gehäuseinnenfläche 2.1 wird bei der Rückbewegung des Steuerventils 4 kleiner. Nach Überschreiten der Steuerkante 2.2 des Gehäuses 2 durch die Kante 4.1 des Steuerventils 4 steht in dem oben beschriebenen Ringraum der Druck des Öls aus der Ringnut 5" an.The sealing surface which is formed by the outer surface 4.7 and the housing inner surface 2.1 becomes smaller when the control valve 4 moves back. After the control edge 2.2 of the housing 2 has been exceeded by the edge 4.1 of the control valve 4, the pressure of the oil from the annular groove 5 ″ is present in the annular space described above.

Das druckseitige Öl wirkt auf die Ringfläche 3.3 des Schlagkolbens 3 und bremst seine Bewegung ab. Das Steuerventil bewegt sich in die Position "Schlaghub" (Fig. 2). Das druckseitige Öl gelangt nach Überschreiten der Steuerkante 3.5 des Schlagkolbens 3 durch die Steuerkante 4.1 des Steuerventils 4 in den inneren Ringraum 8.1. Der Schlagkolben wird beschleunigt in Richtung Schlagwerkzeug bewegt, da zu der Ringfläche 3.3 nun auch die Ringfläche 3.5 in Schlagrichtung wirksam wird. Das Öl der mittleren Ringnut 5"' fließt über den Verbindungskanal 7 und den Ringraum 3.2 zum Ölauslaß 6.The oil on the pressure side acts on the annular surface 3.3 of the percussion piston 3 and brakes its movement. The control valve moves to the "stroke stroke" position (Fig. 2). After the control edge 3.5 of the percussion piston 3 has been exceeded, the pressure-side oil passes through the control edge 4.1 of the control valve 4 into the inner annular space 8.1. The percussion piston is accelerated in the direction of the percussion tool, since the annular surface 3.5 is now also effective in the direction of impact in addition to the annular surface 3.3. The oil of the central annular groove 5 ″ flows through the connecting channel 7 and the annular space 3.2 to the oil outlet 6.

Die Fig. 2 zeigt das Steuerventil 4 in der Position "Schlaghub". Das Steuerventil 4 liegt mit der Stirnfläche 4.5 auf der Ringfläche 2.3 des Gehauses 2. Der Abfluß des Öls aus dem Ringraum 8.1 in den oberen Ablaß 6.5 und die Ringnut 6" und 6' ist unterbunden. Das Drucköl gelangt über die Zuführung 5.3 und die Ringnut 5" in den Raum 8.1 und damit auf die dem Schlagwerkzeug ab gewandte Stirnfläche 3.5 und 3.3 sowie über die Zuführung 5.1 auf die dem Schlagwerkzeug zugewandte Stirnfläche 3.1 des Schlagkolbens.2 shows the control valve 4 in the "stroke stroke" position. The control valve 4 lies with the end face 4.5 on the annular surface 2.3 of the housing 2. The outflow of the oil from the annular space 8.1 into the upper drain 6.5 and the annular groove 6 "and 6 'is prevented. The pressure oil reaches the inlet 5.3 and the annular groove 5 "into space 8.1 and thus onto the end face 3.5 and 3.3 facing the striking tool and via the feed 5.1 onto the end face 3.1 of the striking piston facing the striking tool.

Da die Ringflächen 3.3 und 3.5 deutlich größer sind als die Ringfläche 3.1 bewegt sich der als Differentialkolben ausgebildete Schlagkolben in Richtung des Schlagwerkzeuges.Since the ring surfaces 3.3 and 3.5 are significantly larger than the ring surface 3.1, the striking piston designed as a differential piston moves in the direction of the striking tool.

Claims (4)

1. Hydraulically actuated percussion device consisting of a housing with cylinder spaces and passages for pressurised fluid and, adapted for axially reciprocating movement in the cylinder spaces and constructed as a differential piston, a percussion piston (3) for transmitting percussion energy to a percussion tool (1) and with, concentric in relation to the piston rod of the percussion piston and disposed on the side remote from the percussion tool, an axially movable sleeve-like control valve (4) provided with steps and applying to the percussion piston for the return stroke a constant pressure which is applied to a small area (3.1) while for the percussion stroke the pressure is controlled and is applied to a larger area (3.3, 3.5), characterised in that
a) a connecting passage (7) is provided, of which one mouth (7.2) communicates with an annular space (5"') which in any position of the control valve (4) accommodates the outer collar (4') which is formed on this control valve, while the other mouth (7.1) is open at the end of the percussion stroke and communicates with an inner annular space (8.1) extending between the piston rod (3.6) and the inside wall (2.1) of the housing,
b) and in that the outer collar (4') comprises on that side of the control valve (4) which is remote from the tool (1), a middle control ring face (4.3) of a size (control ring face (4.3)) which produces a reversal of the control valve (4) as a result of the rise in pressure in the oil column which is caused by the exclosure of the mouth (7.1) of the connecting passage (7),
c) and in that there is on the percussion piston (3) a shoulder (3.4) pointing towards the control valve (4) and having an outside diameter which is smaller than the inside diameter of the inner bore (4.2) of the control valve (4) and in that the length of the shoulder (3.4) is such that shortly before the final phase of the return stroke of the percussion piston (3), a part of the cylindrical wall of the shoulder (3.4) penetrates the inner bore (4.2) the other part defining an annular space with the inside wall (2.1) of the housing, the bottom end face (4.1) of the control valve (4) and the middle annular face (3.3) of the cylinder (3") of the percussion piston (3).
2. Percussion device according to claim 1, characterised in that the outside diameter of the head of the control valve (4) on the side remote from the percussion tool is smaller than the outside diameter of an annular space (6") in the housing (2) which communicates with the oil outlet (6).
3. Percussion device according to claims 1 and 2, characterised in that the distance between the mutually facing surfaces of an annular face (2.3) which communicates via an annular groove (6') with an oil outlet (6.5), and the side of an annular face (2.2) which is towards the percussion tool (1) and which communicates with the oil feed (5.3) via an annular groove (5"), is greater than the length of the sleeve-like control valve (4).
4. Percussion device according to one of claims 1 to 3, characterised in that an annular groove (5"), the mouth of which is, except for a part, closed at the end of the percussion stroke by the outer collar of the cylinder (3') of the percussion piston (3), while the annular groove (5") and an annular groove (5"") which is closed by the sleeve portion in the "Strike" position of the control valve (4), and which on the outside of the control valve is bounded by an outer wall (4) and a control edge (4.4) which is remote from the percussion tool (1), are connected to one another by passages (5.2, 5.3, 5.5) which are connected to the pressure line (5).
EP84730125A 1984-01-03 1984-11-26 Hydraulically actuated percussion tool Expired EP0149967B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84730125T ATE37315T1 (en) 1984-01-03 1984-11-26 HYDRAULICALLY ACTUATED IMPACT DEVICE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3400302 1984-01-03
DE19843400302 DE3400302A1 (en) 1984-01-03 1984-01-03 HYDRAULIC ACTUATOR

Publications (2)

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EP0149967A1 EP0149967A1 (en) 1985-07-31
EP0149967B1 true EP0149967B1 (en) 1988-09-21

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ID=6224426

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EP84730125A Expired EP0149967B1 (en) 1984-01-03 1984-11-26 Hydraulically actuated percussion tool

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US (1) US4635531A (en)
EP (1) EP0149967B1 (en)
JP (1) JPS60150975A (en)
AT (1) ATE37315T1 (en)
DE (2) DE3400302A1 (en)
FI (1) FI844848A7 (en)
ZA (1) ZA8523B (en)

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Also Published As

Publication number Publication date
FI844848L (en) 1985-07-04
US4635531A (en) 1987-01-13
JPS60150975A (en) 1985-08-08
ATE37315T1 (en) 1988-10-15
ZA8523B (en) 1985-11-27
DE3400302A1 (en) 1985-08-29
EP0149967A1 (en) 1985-07-31
DE3474120D1 (en) 1988-10-27
DE3400302C2 (en) 1988-01-07
FI844848A0 (en) 1984-12-07
FI844848A7 (en) 1985-07-04

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