EP0933169B1 - Fluid driven percussion device - Google Patents

Fluid driven percussion device Download PDF

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Publication number
EP0933169B1
EP0933169B1 EP99101293A EP99101293A EP0933169B1 EP 0933169 B1 EP0933169 B1 EP 0933169B1 EP 99101293 A EP99101293 A EP 99101293A EP 99101293 A EP99101293 A EP 99101293A EP 0933169 B1 EP0933169 B1 EP 0933169B1
Authority
EP
European Patent Office
Prior art keywords
pressure
working
piston
bush
percussion piston
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
EP99101293A
Other languages
German (de)
French (fr)
Other versions
EP0933169A3 (en
EP0933169A2 (en
Inventor
Heinz-Jürgen Dr.-Ing. Prokop
Martin Schareina
Marcus Geimer
Thomas Deimel
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.)
Construction Tools GmbH
Original Assignee
Krupp Berco Bautechnik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Krupp Berco Bautechnik GmbH filed Critical Krupp Berco Bautechnik GmbH
Publication of EP0933169A2 publication Critical patent/EP0933169A2/en
Publication of EP0933169A3 publication Critical patent/EP0933169A3/en
Application granted granted Critical
Publication of EP0933169B1 publication Critical patent/EP0933169B1/en
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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/371—Use of springs
    • B25D2250/375—Fluid springs

Definitions

  • the invention relates to a fluid-powered hammer mechanism with one in one Working cylinder movable and hitting a tool Percussion piston as well as a control unit with a housing Movable spool, the percussion piston being two different has large piston surfaces, between which a circumferential groove arranged and of which the smaller, effective towards the return stroke Piston surface constantly with a pressure line under working pressure and the larger piston area effective in the direction of the working stroke the control alternately with the pressure line and a drain line connected is.
  • the control slide points in opposite to each other Direction effective slide surfaces, which are designed and are pressurized that the spool with the approach of the Percussion piston during the return stroke to top dead center through its then connected to the pressure line, in the direction of the working stroke position effective control surface switches to the working stroke position, in which also the working pressure is applied to the larger piston surface, and with the Approach of the percussion piston during the working stroke to the Impact point through its then with an unpressurized return line connected control surface is transferred to the return stroke position, in which the application of the larger piston area with the working pressure interrupted and a connection to the drain line is established.
  • composition of the working cylinder which appears to be possible from the point of view of saving costs, of a plurality of longitudinal sections connected to one another in the longitudinal direction of the percussion piston leads at least to problems in the sealing of the working cylinder from the environment and in the guidance of the percussion piston and thus to an increased susceptibility to malfunction.
  • the invention has for its object a generic percussion to develop in such a way that the disadvantages mentioned above at least partially avoided.
  • the percussion improved in terms of the costs associated with its manufacture become.
  • any existing ones in particular longer channels for the supply of the pressurized fluid or for its return from the area of the percussion piston be designed so that they can be manufactured in a simple manner.
  • the object is achieved by a fluid-operated hammer mechanism with the features of claim 1.
  • the basic idea of the invention is to design the working cylinder - in which the percussion piston is movable in the longitudinal direction - as a separate component in the form of a liner, which in turn is arranged in an outer housing and together with this at least one in the longitudinal direction of the two mentioned Parts extending pressure medium channel forms.
  • the liner should be formed in one piece at least over such a longitudinal extent that the front guide section facing the tool for the percussion piston and at least approximately further guide sections adjoining this in the return stroke direction are part of the liner including the guide section for the larger piston area.
  • the liner can also be made longer, ie it can extend beyond the front guide section and / or the guide section for the larger piston area. If the liner with the outer housing only forms at least one pressure medium channel for the percussion piston return stroke, the length of each pressure medium channel concerned with the working stroke is dimensioned in such a way that it extends via a front connecting channel starting therefrom with a return stroke chamber - which takes up the smaller piston area - extends over a rear connecting channel extending therefrom, which is temporarily connected to a working stroke chamber accommodating the larger piston area.
  • any pressure medium channel for the percussion piston return stroke can be produced in a simple manner, in particular by machining only the outer surface of the liner facing the outer housing, before it is introduced into the outer housing.
  • the outer surface of the liner can be provided in the region of the pressure medium channel to be formed with a longitudinal groove or a flat in the longitudinal direction; instead or in addition, the inner wall of the outer housing in the region of the pressure medium channel to be formed can have a longitudinal groove or other depression which forms the same.
  • the former is resiliently biased in the axial direction against a stop element arranged on the outer housing (claim 2).
  • a stop element arranged on the outer housing (claim 2).
  • the pretension can be generated mechanically (claim 3).
  • this can be done by means of at least one spring element - for example in the form of a plate spring.
  • a hydraulic preload can also be provided within the scope of the invention (claim 4). This is preferably designed such that the liner is hydraulically supported against the working stroke direction of the percussion piston (claim 5).
  • the support field is expediently subjected to the working pressure with the interposition of a throttle point (claim 6).
  • the subject matter of the invention can be further developed in that the hydraulic support field - as seen in the working direction of the percussion piston - is arranged behind the return stroke chamber (claim 7).
  • a plurality of pressure medium channels can optionally also be provided (claim 8).
  • the manufacture, assembly and maintenance of the striking mechanism can be further simplified by the fact that the bushing is also hydraulically supported within the outer housing transversely to the longitudinal axis of the striking piston.
  • This can be done in particular in that the liner is held in contact with a circumferential part of the inner surface of the outer housing by means of a radially asymmetrical pressure field on the opposite side of the resultant force (claim 9).
  • the asymmetrical pressure field can be generated in the context of the invention in that between the liner and the outer housing, on the one hand, there is at least one pressure area subjected to the working pressure and, on the other hand, at least one relief point separate therefrom. Due to the interaction between the existing pressure areas and relief points, the resultant force results, with the result that the liner rests there on the inner surface of the outer housing (claim 10).
  • the relief point can each consist of a bore which opens into the interior of the outer housing and is at least temporarily relieved of pressure
  • the liner in the region of the supporting peripheral part advantageously has at least one in the direction of this open channel, which forms a pressure-free return line (claim 11).
  • the embodiment in question (according to at least one of claims 9 to 11) has the consequence that the channel required for generating the asymmetrical pressure field can be open and consequently can be produced as a flattening of the depression in the outer surface of the liner without any particular effort lets, since the channel in question is sealed under the influence of the asymmetrical pressure field at the same time.
  • the spool can with respect to the percussion piston within the Invention can be arranged in any way, so - as at the beginning described - lie laterally offset to the percussion piston.
  • Control spool as a sleeve arranged parallel to the percussion piston trained and at least on part of its longitudinal extent is arranged within the liner (claim 12).
  • the striking mechanism also assigns to the descriptive channels as well as drive and control elements Working cylinder in the form of a liner 2 on which one Percussion piston 3 over successive in the longitudinal direction Guide sections 2a and 2b reciprocable in the transverse direction supports and - if necessary with little play in the radial direction - is arranged within an outer housing 4.
  • the outer housing 4 is closed by means of a hollow cover 5, into the cavity 5a of which the rear end section 3a of the percussion piston projects.
  • the movement of the percussion piston 3 in the direction of the working stroke is indicated by an arrow 6.
  • the striking mechanism 1 has, in a manner known per se, a tool holder, for example for a chisel, which is not shown.
  • the longitudinal axis of the liner 2 - which coincides with that of the percussion piston 3 - is designated by 7.
  • the liner 2 is held in the axial direction on the outer housing mechanically in that it is supported on the one hand by a plurality of preloaded plate springs 8 on the inner end face 5b of the hollow cover and on the other hand on an inner shoulder 4a of the outer housing opposite the end face 5b.
  • the hollow cover thus simultaneously forms a stop element which interacts with and is arranged on the outer housing.
  • this can also be designed differently, for example as a shoulder or support ring arranged on the outer housing.
  • the former is equipped with a sealing element 9.
  • the liner 2 has - seen in the working stroke direction (arrow 6) - behind the shoulder 4a a projection 2c, in which a sealing element 10 is also held for sealing next to the percussion piston.
  • the percussion piston 3 has two lying in the cylinder space of the liner 2 Piston collars 3b and 3c, which by a circumferential groove 3d in the axial Direction are separated from each other.
  • the outward facing Piston area A1 and A2 of the piston collar 3b and 3c together limit with the end face 5b, one held on this and the liner Intermediate ring 11 and with the liner itself a rear Cylinder chamber section 2d or with the liner alone a front Cylinder space section 2e; the piston area A2 is smaller than the piston area A1.
  • the smaller piston area A2 is constantly subjected to the working pressure (system pressure) via a pressure medium channel 12; this is generated by an energy source in the form of a hydraulic pump (not shown) and is fed (among other things) into the pressure medium channel 12 via a transverse bore 13 connected to it in the outer housing 4; this in turn is connected to the front cylinder space section 2e via a transverse bore 14 in the liner.
  • the percussion piston tends to perform a return stroke counter to the working stroke direction (arrow 6).
  • the opening 14a of the transverse bore 14 is arranged with respect to the percussion piston and the liner in such a way that it lies in any case outside the piston collar 3c and thus within the front cylinder space section 2e.
  • the control for switching over the movement of the percussion piston 3 into the bushing 2 including the bushing-like intermediate ring 11 is integrated, ie it is located in the region of the rear cylinder section 2d .
  • the control has a control slide 15 which is movable with respect to parts 2 and 11. This is sleeve-like and is arranged such that - lying coaxially to the percussion piston 3 - it surrounds it at a distance in the region of the rear cylinder space section 2d. Accordingly, the internal cavity of the control slide 15 simultaneously forms part of the rear cylinder section.
  • the control slide 15 has two differently sized end faces - namely a smaller, front end face S1 and a rear, larger one End face S2. Limit the two end faces S1 and S2 the axial range of motion of the spool in the direction of Working strokes (arrow 6) or in the direction of the return stroke. Accordingly the control spool can assume two end positions - namely that in the Drawing indicated return stroke position, in which the Control spool over the smaller end face S1 on a stop surface 2f the liner supports, and a working stroke position in which the larger end face S2 axially abuts the intermediate ring 11.
  • the junction 16a is located near the stop surface 2f arranged in the bushing transverse bore 16, which in turn with the Pressure medium channel 12 is connected and via this with the Working pressure is applied.
  • the pressure medium channel itself is on the one hand from the correspondingly designed outer surface 2g and on the other hand, from the opposite inner surface 4b of the Outer housing 4 formed.
  • control slide 15 has one Cross bore 15a through which, if necessary - i.e. dependent on from the position of the spool - a connection between the rear cylinder space section 2d and a drain line in the form of a Cross bore 17 can be made in the outer housing.
  • the liner 2 near the intermediate ring 11 also with a transverse bore 18 opening into the transverse bore 17, which in turn is also connected to a longitudinal bore 19; latter extends in the opposite direction of the working stroke (arrow 6) to the area in which the liner 2 is supported on the plate spring 8.
  • the transverse bore 13 merges into an annular groove 20 machined into the outer housing, which surrounds the liner 2 and opens into the pressure medium channel 12 in question.
  • its length is greater than the distance between the transverse bores 14 and 16 or between their openings 14a and 16a.
  • the one-piece bush 2 has such a longitudinal extent that it also includes the guide sections 2a and 2b and extends beyond them on both sides.
  • the control slide 15 is - seen in the axial direction - in the area between the two end faces S1 and S2 continue with one in the direction its working stroke effective control surface SF equipped - in Cross section seen - as a radially projecting shoulder is formed and which is opposite a smaller counter surface GF.
  • the latter is via the transverse bore 18 arranged in the liner 2 depressurized.
  • the longitudinal bore 19 connected to the transverse bore 18 passes - seen in the working stroke direction (arrow 6) - outside the area of the control slide 15 and the annular groove 20 into a return line 21, which is formed in the area of the liner as a groove-shaped depression worked into the outer surface thereof ,
  • This return line extends in the working stroke direction into the region of a relief bore 22 connected to it, the latter opening into the interior of the liner 2 and its opening 22a being spaced between the front cylinder space section 2e (namely the return stroke chamber) and the projection 2c
  • the liner 2 is equipped with a sealing element 23 in the region between the relief bore 22 and the support surface 4a and with a sealing element 24 in the region of the projection 2c.
  • the relief bore 22 protects the sealing element 10 from stress caused by the working pressure prevailing in the front cylinder space section 2e.
  • a sealing element 25 held in the outer housing 4 is arranged between the transverse bore 17 merging into an annular groove 17a and the annular groove 20.
  • the return line 21 is also connected to a through hole 26, which in the drawn position of the percussion piston 3 opens into the interior of the liner 2 in the region of the circumferential groove 3d.
  • the control surface SF of the control slide can be acted upon or relieved of the working pressure via a control line 27 - which is connected to the interior of the liner 2 via a through hole 28 in the area between the holes 26 and 22a.
  • a control line 27 - which is connected to the interior of the liner 2 via a through hole 28 in the area between the holes 26 and 22a.
  • the internal opening 28a of the through bore 28 is closed by the piston collar 3c.
  • the control line 27 merges into an annular groove-shaped extension 27a, which is delimited laterally by the control surface SF.
  • control slide 15 assumes the return stroke position in which the end face S1 bears against the stop face 2f; Accordingly, the rear cylinder space section 2d (namely the working lifting chamber) is partially relieved of pressure via the bores 15a and 18, the transverse bore 15a serving as an outflow resistance. Under the influence of the remaining pressure, the control slide 15 is held in the return stroke position shown via its larger end surface S2. At this point in time, the control line 27 is relieved of pressure after the pressure has been relieved by the interaction of the through bores 28 and 26, which had temporarily been connected to one another via the circumferential groove 3d.
  • this return stroke position is on the one hand the junction 16a interrupted in the direction of the cylinder space section 2d and this on the other hand via the bores 15a and 18 to the drain line 17 connected.
  • the intermediate ring 11 - which defines the range of motion of the control slide 15 in the direction of the working stroke position - also serves to guide the control slide.
  • the percussion mechanism has an inner liner which, with the associated channels, bores and the like.
  • Manufactured separately and therefore - with due regard to different requirements that have to be placed on an outer housing or an internal component - can consist of a different material than the outer housing.
  • the material for the liner can be selected taking into account the sliding properties, which are irrelevant for the outer housing.
  • the costs for the manufacture of the striking mechanism can be reduced in that, in particular, longer ducts - such as ducts 12 and 21 - can be produced by simply machining the outer surface of the liner, ie by providing corresponding depressions, grooves, flats or the like, in which Installed state, the inner surface of the outer housing represents part of the wall of the relevant channels.
  • the separate manufacture of the liner also facilitates the production of certain transverse bores (such as, for example, the transverse bore 14), provided that these are only part of the liner and do not need to be closed to the outside.
  • the resilience of the striking mechanism can also be reduced by the resilient support of the liner within the outer housing.
  • the liner 2 is hydraulically prestressed in the axial direction against the outer housing 4, specifically against the working stroke direction (arrow 6) of the percussion piston 3.
  • the liner 2 is supported against the working stroke direction directly on the end face 5b of the hollow cover 5.
  • the outer housing 4 delimits a support chamber 29 via its shoulder 4a with the liner above the projection 2c. This is connected to the pressure medium channel 12 via a longitudinal bore 30 and a throttle bore 31 acting as a throttle point. Under the influence of the working pressure, a hydraulic support field is formed in the support chamber 29, which fixes the liner 2 with respect to the outer housing 4 in the manner already described.
  • the throttle bore 31 serves to stabilize the hydraulic support field in the support chamber 29 in the event of impact loads, namely in that the fluid contained in the support chamber 29 can only escape from it against the outflow resistance of the throttle bore 31.
  • the bores 30 and 31 are also easily accessible on the liner 2 and can therefore be produced in a simple manner.
  • the liner 2 can also be held in contact with a peripheral part 4c of the inner surface 4b of the outer housing 4 by means of a radially asymmetrical pressure field on the side opposite the resultant force (indicated by an arrow 32 pointing upwards). Under the action of the asymmetrical pressure field, a gap s is present between the liner 2 and the outer housing 4 on the side opposite the peripheral part 4c.
  • the liner 2 is with three on their circumference offset flats 2h provided form three pressure medium channels 12 together with the inner surface 4b; of these each go out of a transverse bore 14, which - as already based on the Fig. 1 explains - opens into the front cylinder space section 2e.
  • the return line 21 mentioned above is also in the range of supporting Urnfangs 4c arranged. She is from this one Cooperation with a longitudinal groove machined into the liner 2 educated.
  • the illustration in question additionally shows the position of the through bore 26, the control line 27 and the through bore 28 connected to it for ease of understanding.
  • the latter is arranged in such a way that its outward opening 28b also lies in the region of the supporting peripheral part 4c. Accordingly, it can be disregarded to close the through bore 28, which is also temporarily subjected to the working pressure, in the direction of the outer housing 4, which simplifies the manufacture of the said through bore.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Earth Drilling (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)

Abstract

The rammer has a sleeve-shaped working cylinder (2) in an outer housing (4). The impact piston (3) supports itself on the sleeve via several guide sections. The front guide section (2b) facing the tool, and further neighbouring sections up to the section (2a) for the larger piston face (A1), are integral parts of the sleeve. The outer sleeve face (2g) and the outer housing form pressure medium channels (12) for the return stroke of the impact piston. Each channel is of a length to extend from a front connection channel (14) with a return stroke chamber (2e) accommodating the smaller piston face (A2), via a rear connection channel (16). This is temporarily connected to a working stroke chamber (2d) accommodating the larger piston face.

Description

Die Erfindung betrifft ein fluidbetriebenes Schlagwerk mit einem in einem Arbeitszylinder beweglichen und auf ein Werkzeug aufschlagenden Schlagkolben sowie einer Steuerung mit einem bezüglich eines Gehäuses beweglichen Steuerschieber, wobei der Schlagkolben zwei unterschiedlich große Kolbenflächen aufweist, zwischen denen eine Umfangsnut angeordnet und von denen die kleinere, in Richtung des Rückhubs wirksame Kolbenfläche ständig mit einer unter Arbeitsdruck stehenden Druckleitung und die größere, in Richtung des Arbeitshubs wirksame Kolbenfläche über die Steuerung wechselweise mit der Druckleitung und einer Ablaufleitung verbunden ist. Der Steuerschieber weist in zueinander entgegengesetzter Richtung wirksame Schieberflächen auf, die derart ausgebildet und druckbeaufschlagt sind, daß der Steuerschieber mit der Annäherung des Schlagkolbens während des Rückhubs an den oberen Totpunkt durch seine dann mit der Druckleitung verbundene, in Richtung der Arbeitshubstellung wirksame Steuerfläche in die Arbeitshubstellung umschaltet, in welcher auch an der größeren Kolbenfläche der Arbeitsdruck anliegt, und mit der Annäherung des Schlagkolbens während des Arbeitshubs an den Aufschlagpunkt durch seine dann mit einer drucklosen Rücklaufleitung verbundene Steuerfläche in die Rückhubstellung überführt wird, in welcher die Beaufschlagung der größeren Kolbenfläche mit dem Arbeitsdruck unterbrochen und eine Verbindung zur Ablaufleitung hergestellt ist. The invention relates to a fluid-powered hammer mechanism with one in one Working cylinder movable and hitting a tool Percussion piston as well as a control unit with a housing Movable spool, the percussion piston being two different has large piston surfaces, between which a circumferential groove arranged and of which the smaller, effective towards the return stroke Piston surface constantly with a pressure line under working pressure and the larger piston area effective in the direction of the working stroke the control alternately with the pressure line and a drain line connected is. The control slide points in opposite to each other Direction effective slide surfaces, which are designed and are pressurized that the spool with the approach of the Percussion piston during the return stroke to top dead center through its then connected to the pressure line, in the direction of the working stroke position effective control surface switches to the working stroke position, in which also the working pressure is applied to the larger piston surface, and with the Approach of the percussion piston during the working stroke to the Impact point through its then with an unpressurized return line connected control surface is transferred to the return stroke position, in which the application of the larger piston area with the working pressure interrupted and a connection to the drain line is established.

Aus der Druckschrift DE-C2-3443542 ist ein fluidbetriebenes Schlagwerk der eingangs erwähnten Gattung bekannt, dessen Arbeitszylinder gleichzeitig das Außengehäuse des Schlagwerks bildet und dessen Steuerung seitlich versetzt neben dem Schlagkolben angeordnet ist.
Da für den Betrieb des Schlagkolbens - auch im Zusammenwirken mit der Steuerung - zahlreiche innerhalb des Arbeitszylinders liegende Druckmittelkanäle benötigt werden, ist die Herstellung eines derartigen Schlagwerks insoweit mit erheblichen Kosten verbunden und unter Umständen - wegen der erschwerten Zugänglichkeit insbesondere im Innenraum des Arbeitszylinders - nur durch Einsatz von Spezialwerkzeugen möglich.
Die unter dem Gesichtspunkt der Kostenersparnis möglich erscheinende Zusammensetzung des Arbeitszylinders aus mehreren in Längsrichtung des Schlagkolbens miteinander verbundenen Längsabschnitten führt zumindest zu Problemen bei der Abdichtung des Arbeitszylinders gegen die Umgebung sowie bei der Führung des Schlagkolbens und damit auch zu einer erhöhten Störanfälligkeit.From the document DE-C2-3443542 a fluid-powered striking mechanism of the type mentioned at the outset is known, the working cylinder of which simultaneously forms the outer housing of the striking mechanism and the control of which is arranged laterally offset next to the striking piston.
Since the operation of the percussion piston - also in cooperation with the control system - requires numerous pressure medium channels located within the working cylinder, the manufacture of such a striking mechanism is associated with considerable costs and under certain circumstances - due to the difficult accessibility, particularly in the interior of the working cylinder - only by Use of special tools possible.
The composition of the working cylinder, which appears to be possible from the point of view of saving costs, of a plurality of longitudinal sections connected to one another in the longitudinal direction of the percussion piston leads at least to problems in the sealing of the working cylinder from the environment and in the guidance of the percussion piston and thus to an increased susceptibility to malfunction.

Der Erfindung liegt die Aufgabe zugrunde, ein gattungsgemäßes Schlagwerk in der Weise weiterzuentwickeln, daß die zuvor angesprochenen Nachteile zumindest teilweise vermieden werden. Insbesondere soll das Schlagwerk im Hinblick auf die mit seiner Herstellung verbundenen Kosten verbessert werden. In diesem Zusammenhang sollen insbesondere etwa vorhandene längere Kanäle für die Zuführung des unter Druck stehenden Fluids bzw. für dessen Rückführung aus dem Bereich des Schlagkolbens derart ausgestaltet sein, daß sie auf einfache Weise hergestellt werden können.The invention has for its object a generic percussion to develop in such a way that the disadvantages mentioned above at least partially avoided. In particular, the percussion improved in terms of the costs associated with its manufacture become. In this context, any existing ones in particular longer channels for the supply of the pressurized fluid or for its return from the area of the percussion piston be designed so that they can be manufactured in a simple manner.

Die Aufgabe wird durch ein fluidbetriebenes Schlagwerk mit den Merkmalen des Anspruchs 1 gelöst.
Der Grundgedanke der Erfindung besteht dabei darin, den Arbeitszylinder - in dem sich der Schlagkolben, in Längsrichtung beweglich, abstützt - als gesondertes Bauteil in Form einer Laufbuchse auszubilden, die ihrerseits in einem Außengehäuse angeordnet ist und gemeinsam mit diesem zumindest einen in Längsrichtung der beiden genannten Teile verlaufenden Druckmittelkanal bildet.
Über diesen Grundgedanken hinausgehend sollte die Laufbuchse zumindest über eine derartige Längserstreckung einteilig ausgebildet sein, daß der dem Werkzeug zugewandte vordere Führungsabschnitt für den Schlagkolben und zumindest sich etwa an diesen in Rückhubrichtung anschließende weitere Führungsabschnitte bis zum Führungsabschnitt für die größere Kolbenfläche einschließlich Bestandteil der Laufbuchse sind. Dies hat den Vorteil, daß an der Laufbuchse alle für die Abstützung des Schlagkolbens wesentlichen Führungsabschnitte angeordnet sind und diese in einfacher Weise als durchgehendes Bauelement hergestellt werden kann. Die Laufbuchse kann im Rahmen der Erfindung auch länger ausgebildet sein, d.h. sich über den vorderen Führungsabschnitt und/oder den Führungsabschnitt für die größere Kolbenfläche hinaus erstrecken.
Soweit die Laufbuchse mit dem Außengehäuse lediglich zumindest einen Druckmittelkanal für den Schlagkolben-Rückhub bildet, ist die Länge jedes betreffenden, mit dem Arbeitshub beaufschlagten Druckmittelkanals so bemessen, daß er sich über einen davon ausgehenden vorderen Verbindungskanal mit einer Rückhubkammer - welche die kleinere Kolbenfläche aufnimmt - bis über einen davon ausgehenden hinteren Verbindungskanal erstreckt, welcher zeitweilig an eine die größere Kolbenfläche aufnehmende Arbeitshubkammer angeschlossen ist.
Der mit dieser Ausgestaltung erzielte Vorteil besteht darin, daß sich zumindest jeder etwa vorhandene Druckmittelkanal für den Schlagkolben-Rückhub in einfacher Weise - insbesondere durch Bearbeitung lediglich der dem Außengehäuse zugewandten Außenfläche der Laufbuchse - herstellen läßt, bevor diese in das Außengehäuse eingebracht wird.
Die Außenfläche der Laufbuchse kann dabei im Bereich des zu bildenden Druckmittelkanals mit einer Längsnut oder einer in Längsrichtung verlaufenden Abflachung ausgestattet sein; statt dessen oder auch zusätzlich kann die Innenwand des Außengehäuses im Bereich des zu bildenden Druckmittelkanals eine diesen mitbildende Längsnut oder sonstige Vertiefung aufweisen.The object is achieved by a fluid-operated hammer mechanism with the features of claim 1.
The basic idea of the invention is to design the working cylinder - in which the percussion piston is movable in the longitudinal direction - as a separate component in the form of a liner, which in turn is arranged in an outer housing and together with this at least one in the longitudinal direction of the two mentioned Parts extending pressure medium channel forms.
Beyond this basic idea, the liner should be formed in one piece at least over such a longitudinal extent that the front guide section facing the tool for the percussion piston and at least approximately further guide sections adjoining this in the return stroke direction are part of the liner including the guide section for the larger piston area. This has the advantage that all the guide sections which are essential for supporting the percussion piston are arranged on the liner and these can be produced in a simple manner as a continuous component. In the context of the invention, the liner can also be made longer, ie it can extend beyond the front guide section and / or the guide section for the larger piston area.
If the liner with the outer housing only forms at least one pressure medium channel for the percussion piston return stroke, the length of each pressure medium channel concerned with the working stroke is dimensioned in such a way that it extends via a front connecting channel starting therefrom with a return stroke chamber - which takes up the smaller piston area - extends over a rear connecting channel extending therefrom, which is temporarily connected to a working stroke chamber accommodating the larger piston area.
The advantage achieved with this configuration is that at least any pressure medium channel for the percussion piston return stroke can be produced in a simple manner, in particular by machining only the outer surface of the liner facing the outer housing, before it is introduced into the outer housing.
The outer surface of the liner can be provided in the region of the pressure medium channel to be formed with a longitudinal groove or a flat in the longitudinal direction; instead or in addition, the inner wall of the outer housing in the region of the pressure medium channel to be formed can have a longitudinal groove or other depression which forms the same.

Wesentlich ist in dem hier angesprochenen Zusammenhang, daß die Außenfläche der Laufbuchse und die Innenwand des Außengehäuses miteinander jeweils einen als Druckmittelkanal dienenden Hohlraum begrenzen, der innerhalb des Außengehäuses angeordnet ist.It is essential in the context mentioned here that the Outer surface of the liner and the inner wall of the outer housing with each other a cavity serving as a pressure medium channel limit which is arranged within the outer housing.

Zur Fixierung der Lage der Laufbuchse bezüglich des Außengehäuses ist erstere in axialer Richtung nachgiebig auch gegen ein am Außengehäuse angeordnetes Anschlagelement vorgespannt (Anspruch 2). Dies setzt voraus, daß die Laufbuchse sich über eine Zusatzeinrichtung mit Federungseigenschaft in axialer Richtung abstützt und das Außengehäuse mit einem Anschlagelement ausgestattet ist oder zusammenwirkt; letzteres kann insbesondere als mit dem Außengehäuse verbundener Hohldeckel ausgebildet sein.
Im einfachsten Fall kann die Vorspannung mechanisch erzeugt werden (Anspruch 3). Insbesondere kann dies mittels zumindest eines Federelements - beispielsweise in Form einer Tellerfeder - geschehen. Alternativ kann im Rahmen der Erfindung auch eine hydraulische Vorspannung vorgesehen sein (Anspruch 4). Diese ist vorzugsweise derart ausgestaltet, daß sich die Laufbuchse entgegen der Arbeitshubrichtung des Schlagkolbens hydraulisch abstützt (Anspruch 5).To fix the position of the liner with respect to the outer housing, the former is resiliently biased in the axial direction against a stop element arranged on the outer housing (claim 2). This presupposes that the liner is supported in the axial direction via an additional device with suspension properties and that the outer housing is equipped or cooperates with a stop element; the latter can in particular be designed as a hollow cover connected to the outer housing.
In the simplest case, the pretension can be generated mechanically (claim 3). In particular, this can be done by means of at least one spring element - for example in the form of a plate spring. Alternatively, a hydraulic preload can also be provided within the scope of the invention (claim 4). This is preferably designed such that the liner is hydraulically supported against the working stroke direction of the percussion piston (claim 5).

Um sicherzustellen, daß das zuvor erwähnte hydraulische Stützfeld auch bei stoßartiger Beanspruchung erhalten bleibt, ist das Stützfeld zweckmäßig unter Zwischenschaltung einer Drosselstelle mit dem Arbeitsdruck beaufschlagt (Anspruch 6).
Der Erfindungsgegenstand kann in diesem Zusammenhang dadurch weitergehend ausgestaltet sein, daß das hydraulische Stützfeld - in Arbeitsrichtung des Schlagkolbens gesehen - hinter der Rückhubkammer angeordnet ist (Anspruch 7). Für die Druckbeaufschlagung des hydraulischen Stützfelds können dabei gegebenenfalls auch mehrere Druckmittelkanäle vorgesehen sein (Anspruch 8). In order to ensure that the hydraulic support field mentioned above is retained even in the event of sudden loads, the support field is expediently subjected to the working pressure with the interposition of a throttle point (claim 6).
In this context, the subject matter of the invention can be further developed in that the hydraulic support field - as seen in the working direction of the percussion piston - is arranged behind the return stroke chamber (claim 7). For the pressurization of the hydraulic support field, a plurality of pressure medium channels can optionally also be provided (claim 8).

Die Herstellung, Montage und Wartung des Schlagwerks läßt sich dadurch weitergehend vereinfachen, daß die Laufbuchse auch quer zur Längsachse des Schlagkolbens hydraulisch innerhalb des Außengehäuses abgestützt ist. Dies kann insbesondere dadurch geschehen, daß die Laufbuchse mittels eines radial asymmetrischen Druckfelds auf der dessen Kraftresultierender gegenüberliegenden Seite an einem Umfangsteil der Innenfläche des Außengehäuses in Anlage gehalten ist (Anspruch 9).
Das asymmetrische Druckfeld kann im Rahmen der Erfindung dadurch erzeugt werden, daß zwischen der Laufbuchse und dem Außengehäuse einerseits zumindest ein mit dem Arbeitsdruck beaufschlagter Druckbereich und andererseits davon getrennt zumindest eine Entlastungsstelle vorhanden ist. Durch das Zusammenwirken zwischen den vorhandenen Druckbereichen und Entlastungsstellen bildet sich die erwähnte Kraftresultierende mit der Folge aus, daß die Laufbuchse dort an der Innenfläche des Außengehäuses anliegt (Anspruch 10).The manufacture, assembly and maintenance of the striking mechanism can be further simplified by the fact that the bushing is also hydraulically supported within the outer housing transversely to the longitudinal axis of the striking piston. This can be done in particular in that the liner is held in contact with a circumferential part of the inner surface of the outer housing by means of a radially asymmetrical pressure field on the opposite side of the resultant force (claim 9).
The asymmetrical pressure field can be generated in the context of the invention in that between the liner and the outer housing, on the one hand, there is at least one pressure area subjected to the working pressure and, on the other hand, at least one relief point separate therefrom. Due to the interaction between the existing pressure areas and relief points, the resultant force results, with the result that the liner rests there on the inner surface of the outer housing (claim 10).

Die Entlastungsstelle kann jeweils aus einer Bohrung bestehen, welche in den Innenraum des Außengehäuses einmündet und zumindest zeitweilig druckentlastet ist
Vorteilhaft weist die Laufbuchse im Bereich des abstützenden Umfangsteils zumindest einen in Richtung auf dieses offenen Kanal auf, der eine drucklose Rücklaufleitung bildet (Anspruch 11).
Die in Rede stehende Ausgestaltung (nach zumindest einem der Ansprüche 9 bis 11) hat zur Folge, daß der für die Erzeugung des asymmetrischen Druckfelds benötigte Kanal offen sein kann und sich demzufolge als Abflachung der bzw. Vertiefung in der Außenfläche der Laufbuchse ohne besonderen Aufwand herstellen läßt, da der betreffende Kanal unter Einwirkung des asymmetrischen Druckfelds gleichzeitig abgedichtet wird.The relief point can each consist of a bore which opens into the interior of the outer housing and is at least temporarily relieved of pressure
The liner in the region of the supporting peripheral part advantageously has at least one in the direction of this open channel, which forms a pressure-free return line (claim 11).
The embodiment in question (according to at least one of claims 9 to 11) has the consequence that the channel required for generating the asymmetrical pressure field can be open and consequently can be produced as a flattening of the depression in the outer surface of the liner without any particular effort lets, since the channel in question is sealed under the influence of the asymmetrical pressure field at the same time.

Der Steuerschieber kann bezüglich des Schlagkolbens im Rahmen der Erfindung an sich beliebig angeordnet sein, also auch - wie eingangs beschrieben - zum Schlagkolben seitlich versetzt liegen. The spool can with respect to the percussion piston within the Invention can be arranged in any way, so - as at the beginning described - lie laterally offset to the percussion piston.

Eine besonders einfache Ausführung hinsichtlich der Ausbildung des Außengehäuses läßt sich dabei dadurch verwirklichen, daß der Steuerschieber als parallel zum Schlagkolben angeordnete Hülse ausgebildet und zumindest auf einem Teil seiner Längserstreckung innerhalb der Laufbuchse angeordnet ist (Anspruch 12).A particularly simple design with regard to the training of Outer housing can be realized in that the Control spool as a sleeve arranged parallel to the percussion piston trained and at least on part of its longitudinal extent is arranged within the liner (claim 12).

Der Erfindungsgegenstand wird nachfolgend anhand in der Zeichnung schematisiert dargestellter Ausführungsbeispiele im einzelnen erläutert:
Es zeigen:

Fig. 1
einen Teil-Längsschnitt durch ein fluidbetriebenes Schlagwerk mit einer Laufbuchse zur Abstützung des Schlagkolbens, die in einem Außengehäuse angeordnet und in axialer Richtung mechanisch über Federelemente in Anlage gehalten ist;
Fig. 2
einen Teil-Längsschnitt durch ein fluidbetriebenes Schlagwerk, welches im wesentlichen mit der Ausführung gemäß Fig. 1 übereinstimmt und dessen Laufbuchse in axialer Richtung entgegen der Arbeitshubrichtung des Schlagkolbens hydraulisch in Anlage gehalten ist; und
Fig. 3
einen Vertikalschnitt gemäß Linie III-III in Fig. 1.
The subject matter of the invention is explained in detail below on the basis of exemplary embodiments shown schematically in the drawing:
Show it:
Fig. 1
a partial longitudinal section through a fluid-powered striking mechanism with a liner for supporting the percussion piston, which is arranged in an outer housing and is held mechanically in the axial direction via spring elements in contact;
Fig. 2
a partial longitudinal section through a fluid-powered striking mechanism, which essentially corresponds to the embodiment of FIG 1 and whose liner is held hydraulically in the axial direction against the working stroke direction of the percussion piston. and
Fig. 3
a vertical section along line III-III in Fig. 1st

Das allgemein mit 1 bezeichnete Schlagwerk weist neben den noch zu beschreibenden Kanälen sowie Antriebs- und Steuerungselementen einen Arbeitszylinder in Form einer Laufbuchse 2 auf, an der sich ein Schlagkolben 3 über in Längsrichtung aufeinanderfolgende Führungsabschnitte 2a sowie 2b hin- und herbeweglich in Querrichtung abstützt und die - allenfalls mit geringem Spiel in radialer Richtung - innerhalb eines Außengehäuses 4 angeordnet ist. The striking mechanism, generally designated 1, also assigns to the descriptive channels as well as drive and control elements Working cylinder in the form of a liner 2 on which one Percussion piston 3 over successive in the longitudinal direction Guide sections 2a and 2b reciprocable in the transverse direction supports and - if necessary with little play in the radial direction - is arranged within an outer housing 4.

Auf der in der Darstellung (vgl. Fig. 1) linken Seite ist das Außengehäuse 4 mittels eines Hohldeckels 5 verschlossen, in dessen Hohlraum 5a der hintere Endabschnitt 3a des Schlagkolbens hineinragt.
Die Bewegung des Schlagkolbens 3 in Richtung des Arbeitshubs ist durch einen Pfeil 6 angedeutet. Auf der rechten Seite weist das Schlagwerk 1 in an sich bekannter Weise eine Werkzeugaufnahme beispielsweise für einen Meißel auf, die nicht dargestellt ist.
Die Längsachse der Laufbuchse 2 - die mit derjenigen des Schlagkolbens 3 zusammenfällt - ist mit 7 bezeichnet.On the left in the illustration (see FIG. 1), the outer housing 4 is closed by means of a hollow cover 5, into the cavity 5a of which the rear end section 3a of the percussion piston projects.
The movement of the percussion piston 3 in the direction of the working stroke is indicated by an arrow 6. On the right side, the striking mechanism 1 has, in a manner known per se, a tool holder, for example for a chisel, which is not shown.
The longitudinal axis of the liner 2 - which coincides with that of the percussion piston 3 - is designated by 7.

Die Laufbuchse 2 ist in axialer Richtung dadurch an dem Außengehäuse mechanisch in Anlage gehalten, daß sie sich einerseits über mehrere vorgespannte Tellerfedem 8 an der innenliegenden Stirnfläche 5b des Hohldeckels und andererseits an einer der Stimfläche 5b entgegengerichteten innenliegenden Schulter 4a des Außengehäuses abstützt. Der Hohldeckel bildet somit gleichzeitig ein mit dem Außengehäuse zusammenwirkendes und an diesem angeordnetes Anschlagelement. Dieses kann jedoch auch andersartig ausgebildet sein, beispielsweise als an dem Außengehäuse angeordneter Absatz oder Stützring.
Zur Abdichtung des Hohlraums 5a gegen den Schlagkolben 3 ist ersterer mit einem Dichtelement 9 ausgestattet. Die Laufbuchse 2 weist - in Arbeitshubrichtung (Pfeil 6) gesehen - hinter der Schulter 4a einen Vorsprung 2c auf, in dem zur Abdichtung neben dem Schlagkolben ebenfalls ein Dichtelement 10 gehalten ist.The liner 2 is held in the axial direction on the outer housing mechanically in that it is supported on the one hand by a plurality of preloaded plate springs 8 on the inner end face 5b of the hollow cover and on the other hand on an inner shoulder 4a of the outer housing opposite the end face 5b. The hollow cover thus simultaneously forms a stop element which interacts with and is arranged on the outer housing. However, this can also be designed differently, for example as a shoulder or support ring arranged on the outer housing.
To seal the cavity 5a against the percussion piston 3, the former is equipped with a sealing element 9. The liner 2 has - seen in the working stroke direction (arrow 6) - behind the shoulder 4a a projection 2c, in which a sealing element 10 is also held for sealing next to the percussion piston.

Der Schlagkolben 3 weist im Zylinderraum der Laufbuchse 2 liegend zwei Kolbenbunde 3b und 3c auf, welche durch eine Umfangsnut 3d in axialer Richtung voneinander getrennt sind. Die nach außen gerichtete Kolbenfläche A1 und A2 des Kolbenbundes 3b bzw. 3c begrenzt gemeinsam mit der Stirnfläche 5b, einem an dieser und der Laufbuchse gehaltenen Zwischenring 11 sowie mit der Laufbuchse selbst einen hinteren Zylinderraumabschnitt 2d bzw. mit der Laufbuchse allein einen vorderen Zylinderraumabschnitt 2e; dabei ist die Kolbenfläche A2 kleiner bemessen als die Kolbenfläche A1.The percussion piston 3 has two lying in the cylinder space of the liner 2 Piston collars 3b and 3c, which by a circumferential groove 3d in the axial Direction are separated from each other. The outward facing Piston area A1 and A2 of the piston collar 3b and 3c together limit with the end face 5b, one held on this and the liner Intermediate ring 11 and with the liner itself a rear Cylinder chamber section 2d or with the liner alone a front Cylinder space section 2e; the piston area A2 is smaller than the piston area A1.

Im Gegensatz zu der größeren Kolbenfläche A1 ist die kleinere Kolbenfläche A2 über einen Druckmittelkanal 12 ständig mit dem Arbeitsdruck (Systemdruck) beaufschlagt; dieser wird von einer Energiequelle in Form einer nicht dargestellten Hydraulikpumpe erzeugt und über eine mit dieser in Verbindung stehende Querbohrung 13 im Außengehäuse 4 (unter anderem) in den Druckmittelkanal 12 eingespeist; dieser steht seinerseits über eine Querbohrung 14 in der Laufbuchse mit dem vorderen Zylinderraumabschnitt 2e in Verbindung.
Unter der Wirkung des die Kolbenfläche A2 beaufschlagenden Arbeitsdrocks hat der Schlagkolben die Tendenz, entgegen der Arbeitshubrichtung (Pfeil 6) einen Rückhub auszuführen. Die Einmündung 14a der Querbohrung 14 ist bezüglich des Schlagkolbens und der Laufbuchse derart angeordnet, daß sie in jedem Fall außerhalb des Kolbenbundes 3c und somit innerhalb des vorderen Zylinderraumabschnitts 2e liegt.In contrast to the larger piston area A1, the smaller piston area A2 is constantly subjected to the working pressure (system pressure) via a pressure medium channel 12; this is generated by an energy source in the form of a hydraulic pump (not shown) and is fed (among other things) into the pressure medium channel 12 via a transverse bore 13 connected to it in the outer housing 4; this in turn is connected to the front cylinder space section 2e via a transverse bore 14 in the liner.
Under the effect of the working rock that acts on the piston surface A2, the percussion piston tends to perform a return stroke counter to the working stroke direction (arrow 6). The opening 14a of the transverse bore 14 is arranged with respect to the percussion piston and the liner in such a way that it lies in any case outside the piston collar 3c and thus within the front cylinder space section 2e.

Bei der in Rede stehenden Ausführungsform (gemäß Fig. 1 und auch gemäß Fig. 2) ist die Steuerung für die Umschaltung der Bewegung des Schlagkolbens 3 in die Laufbuchse 2 einschließlich des buchsenartigen Zwischenrings 11 integriert, d.h. sie befindet sich im Bereich des hinteren Zylinderraumabschnitts 2d.
Die Steuerung weist einen bezüglich der Teile 2 und 11 beweglichen Steuerschieber 15 auf. Dieser ist hülsenartig ausgebildet und derart angeordnet, daß er - koaxial zum Schlagkolben 3 liegend - diesen im Bereich des hinteren Zylinderraumabschnitts 2d mit Abstand umschließt. Dementsprechend stellt der innenliegende Hohlraum des Steuerschiebers 15 gleichzeitig einen Teil des hinteren Zylinderraumabschnitts dar. In the embodiment in question (according to FIG. 1 and also according to FIG. 2), the control for switching over the movement of the percussion piston 3 into the bushing 2 including the bushing-like intermediate ring 11 is integrated, ie it is located in the region of the rear cylinder section 2d ,
The control has a control slide 15 which is movable with respect to parts 2 and 11. This is sleeve-like and is arranged such that - lying coaxially to the percussion piston 3 - it surrounds it at a distance in the region of the rear cylinder space section 2d. Accordingly, the internal cavity of the control slide 15 simultaneously forms part of the rear cylinder section.

Der Steuerschieber 15 weist zwei unterschiedlich große Stirnflächen auf - nämlich eine kleinere, vordere Stirnfläche S1 und eine hintere, größere Stirnfläche S2. Die beiden genannten Stirnflächen S1 und S2 begrenzen den axialen Bewegungsspielraum des Steuerschiebers in Richtung des Arbeitshubs (Pfeil 6) bzw. in Richtung des Rückhubs. Dementsprechend kann der Steuerschieber zwei Endstellungen einnehmen - nämlich die in der Zeichnung angedeutete Rückhubstellung, in welcher sich der Steuerschieber über die kleinere Stirnfläche S1 an einer Anschlagfläche 2f der Laufbuchse abstützt, und eine Arbeitshubstellung, in welcher die größere Stirnfläche S2 axial an dem Zwischenring 11 anliegt.The control slide 15 has two differently sized end faces - namely a smaller, front end face S1 and a rear, larger one End face S2. Limit the two end faces S1 and S2 the axial range of motion of the spool in the direction of Working strokes (arrow 6) or in the direction of the return stroke. Accordingly the control spool can assume two end positions - namely that in the Drawing indicated return stroke position, in which the Control spool over the smaller end face S1 on a stop surface 2f the liner supports, and a working stroke position in which the larger end face S2 axially abuts the intermediate ring 11.

In der Nähe der Anschlagfläche 2f befindet sich die Einmündung 16a einer in der Laufbuchse angeordneten Querbohrung 16, die ihrerseits mit dem Druckmittelkanal 12 in Verbindung steht und über diesen ständig mit dem Arbeitsdruck beaufschlagt ist. Der Druckmittelkanal selbst wird einerseits von der in seinem Bereich entsprechend ausgebildeten Außenfläche 2g und andererseits von der dieser gegenüberliegenden Innenfläche 4b des Außengehäuses 4 gebildet.The junction 16a is located near the stop surface 2f arranged in the bushing transverse bore 16, which in turn with the Pressure medium channel 12 is connected and via this with the Working pressure is applied. The pressure medium channel itself is on the one hand from the correspondingly designed outer surface 2g and on the other hand, from the opposite inner surface 4b of the Outer housing 4 formed.

In der Nähe seiner größeren Stirnfläche S2 weist der Steuerschieber 15 eine Querbohrung 15a auf, über welche gegebenenfalls - d.h. in Abhängigkeit von der Stellung des Steuerschiebers - eine Verbindung zwischen dem hinteren Zylinderraumabschnitt 2d und einer Ablaufleitung in Gestalt einer Querbohrung 17 im Außengehäuse hergestellt werden kann. Zu diesem Zweck ist die Laufbuchse 2 in der Nähe des Zwischenrings 11 ebenfalls mit einer in die Querbohrung 17 einmündenden Querbohrung 18 versehen, die ihrerseits auch mit einer Längsbohrung 19 in Verbindung steht; letztere erstreckt sich entgegen der Arbeitshubrichtung (Pfeil 6) bis in den Bereich, in dem sich die Laufbuchse 2 an den Tellerfedem 8 abstützt. In the vicinity of its larger end face S2, the control slide 15 has one Cross bore 15a through which, if necessary - i.e. dependent on from the position of the spool - a connection between the rear cylinder space section 2d and a drain line in the form of a Cross bore 17 can be made in the outer housing. To this Purpose is the liner 2 near the intermediate ring 11 also with a transverse bore 18 opening into the transverse bore 17, which in turn is also connected to a longitudinal bore 19; latter extends in the opposite direction of the working stroke (arrow 6) to the area in which the liner 2 is supported on the plate spring 8.

Die Querbohrung 13 geht in eine in das Außengehäuse eingearbeitete Ringnut 20 über, welche die Laufbuchse 2 umschließt und in den betreffenden Druckmittelkanal 12 einmündet. Dessen Länge ist in dem dargestellten Ausführungsbeispiel größer bemessen als der Abstand zwischen den Querbohrungen 14 und 16 bzw. zwischen deren Einmündungen 14a und 16a.
Die einteilig ausgebildete Laufbuchse 2 weist eine derartige Längserstreckung auf, daß sie die Führungsabschnitte 2a und 2b mitumfaßt und sich beiderseits über diese hinaus erstreckt.The transverse bore 13 merges into an annular groove 20 machined into the outer housing, which surrounds the liner 2 and opens into the pressure medium channel 12 in question. In the exemplary embodiment shown, its length is greater than the distance between the transverse bores 14 and 16 or between their openings 14a and 16a.
The one-piece bush 2 has such a longitudinal extent that it also includes the guide sections 2a and 2b and extends beyond them on both sides.

Der Steuerschieber 15 ist - in axialer Richtung gesehen - im Bereich zwischen den beiden Stirnflächen S1 und S2 weiterhin mit einer in Richtung seiner Arbeitshubstellung wirksamen Steuerfläche SF ausgestattet, die - im Querschnitt gesehen - als radial nach außen vorkragender Absatz ausgebildet ist und der eine kleinere Gegenfläche GF gegenüberliegt. Letztere ist über die in der Laufbuchse 2 angeordnete Querbohrung 18 druckentlastet.The control slide 15 is - seen in the axial direction - in the area between the two end faces S1 and S2 continue with one in the direction its working stroke effective control surface SF equipped - in Cross section seen - as a radially projecting shoulder is formed and which is opposite a smaller counter surface GF. The latter is via the transverse bore 18 arranged in the liner 2 depressurized.

Die mit der Querbohrung 18 in Verbindung stehende Längsbohrung 19 geht - in Arbeitshubrichtung (Pfeil 6) gesehen - außerhalb des Bereichs des Steuerschiebers 15 und der Ringnut 20 in eine Rücklaufleitung 21 über, die im Bereich der Laufbuchse als in deren Außenfläche eingearbeitete nutenförmige Vertiefung ausgebildet ist.
Diese Rücklaufleitung erstreckt sich in Arbeitshubrichtung bis in den Bereich einer mit ihr verbundenen Entlastungsbohrung 22, wobei letztere in den Innenraum der Laufbuchse 2 einmündet und ihre Einmündung 22a mit Abstand zwischen dem vorderen Zylinderraumabschnitt 2e (nämlich der Rückhubkammer) und dem Vorsprung 2c liegt
Zur Abdichtung gegen das Außengehäuse 4 ist die Laufbuchse 2 im Bereich zwischen der Entlastungsbohrung 22 und der Stützfläche 4a mit einem Dichtelement 23 und im Bereich des Vorsprungs 2c mit einem Dichtelement 24 ausgestattet. Durch die Entlastungsbohrung 22 wird das Dichtelement 10 vor einer Beanspruchung durch den im vorderen Zylinderraumabschnitt 2e herrschenden Arbeitsdruck geschützt.
Zwischen der in eine Ringnut 17a übergehenden Querbohrung 17 und der Ringnut 20 ist ein im Außengehäuse 4 gehaltenes Dichtelement 25 angeordnet.
Die Rücklaufleitung 21 steht weiterhin mit einer Durchgangsbohrung 26 in Verbindung, die in der gezeichneten Stellung des Schlagkolbens 3 im Bereich der Umfangsnut 3d in den Innenraum der Laufbuchse 2 einmündet.The longitudinal bore 19 connected to the transverse bore 18 passes - seen in the working stroke direction (arrow 6) - outside the area of the control slide 15 and the annular groove 20 into a return line 21, which is formed in the area of the liner as a groove-shaped depression worked into the outer surface thereof ,
This return line extends in the working stroke direction into the region of a relief bore 22 connected to it, the latter opening into the interior of the liner 2 and its opening 22a being spaced between the front cylinder space section 2e (namely the return stroke chamber) and the projection 2c
For sealing against the outer housing 4, the liner 2 is equipped with a sealing element 23 in the region between the relief bore 22 and the support surface 4a and with a sealing element 24 in the region of the projection 2c. The relief bore 22 protects the sealing element 10 from stress caused by the working pressure prevailing in the front cylinder space section 2e.
A sealing element 25 held in the outer housing 4 is arranged between the transverse bore 17 merging into an annular groove 17a and the annular groove 20.
The return line 21 is also connected to a through hole 26, which in the drawn position of the percussion piston 3 opens into the interior of the liner 2 in the region of the circumferential groove 3d.

Die Steuerfläche SF des Steuerschiebers kann über eine Steuerleitung 27 - welche über eine Durchgangsbohrung 28 im Bereich zwischen den Bohrungen 26 und 22a mit dem Innenraum der Laufbuchse 2 in Verbindung steht - mit dem Arbeitsdruck beaufschlagt bzw. druckentlastet werden. In der gezeigten Stellung ist die innenliegende Einmündung 28a der Durchgangsbohrung 28 durch den Kolbenbund 3c verschlossen.
Im Bereich der Steuerfläche SF geht die Steuerleitung 27 in eine ringnutförmige Erweiterung 27a über, die seitlich von der Steuerfläche SF begrenzt wird. In der Darstellung nimmt der Steuerschieber 15 die Rückhubstellung ein, in welcher die Stirnfläche S1 an der Anschlagfläche 2f anliegt; dementsprechend ist der hintere Zylinderraumabschnitt 2d (nämlich die Arbeitshubkammer) über die Bohrungen 15a und 18 teilweise druckentlastet, wobei die Querbohrung 15a als Ausströmwiderstand dient. Unter Einwirkung des verbliebenen Restdrucks wird der Steuerschieber 15 über seine größere Stirnfläche S2 in der gezeigten Rückhubstellung festgehalten. Die Steuerleitung 27 ist zu diesem Zeitpunkt - nach vorausgehender Druckentlastung durch Zusammenwirken der Durchgangsbohrungen 28 und 26, die zeitweilig über die Umfangsnut 3d miteinander in Verbindung gestanden hatten - druckentlastet. The control surface SF of the control slide can be acted upon or relieved of the working pressure via a control line 27 - which is connected to the interior of the liner 2 via a through hole 28 in the area between the holes 26 and 22a. In the position shown, the internal opening 28a of the through bore 28 is closed by the piston collar 3c.
In the area of the control surface SF, the control line 27 merges into an annular groove-shaped extension 27a, which is delimited laterally by the control surface SF. In the illustration, the control slide 15 assumes the return stroke position in which the end face S1 bears against the stop face 2f; Accordingly, the rear cylinder space section 2d (namely the working lifting chamber) is partially relieved of pressure via the bores 15a and 18, the transverse bore 15a serving as an outflow resistance. Under the influence of the remaining pressure, the control slide 15 is held in the return stroke position shown via its larger end surface S2. At this point in time, the control line 27 is relieved of pressure after the pressure has been relieved by the interaction of the through bores 28 and 26, which had temporarily been connected to one another via the circumferential groove 3d.

Die bereits erwähnte Druckabsenkung im hinteren Zylinderraumabschnitt 2d wird weiterhin dadurch ermöglicht, daß der Steuerschieber 15 die Einmündung 16a der Querbohrung 16 verschließt und somit die Zuführung des Druckmittels über die Druckleitung 13 verhindert.The already mentioned lowering of pressure in the rear cylinder section 2d is further made possible by the fact that the control slide 15 The mouth 16a of the transverse bore 16 closes and thus the feed of the pressure medium via the pressure line 13 prevented.

Falls der Schlagkolben 3 seinen Rückhub (entgegen der Arbeitshubrichtung gemäß Pfeil 6) fortsetzt, wird die Einmündung 28a schließlich mit dem vorderen Zylinderraumabschnitt 2e verbunden, welcher über die Querbohrung 14 und den Druckmittelkanal 12 ständig mit dem Arbeitsdruck beaufschlagt ist. Dementsprechend liegt dann auch an der Steuerfläche SF des Steuerschiebers 15 der Arbeitsdruck an mit der Folge, daß dieser sich in der Darstellung nach links verschiebt, dabei die Querbohrung 15a absperrt und die Einmündung 16a freisetzt, wodurch der hintere Zylinderraumabschnitt 2d unter Arbeitsdruck gesetzt wird. Dementsprechend wird der Schlagkolben 3 - entgegen der von der kleineren Kolbenfläche A2 ausgehenden Rückstellkraft - in Arbeitshubrichtung (Pfeil 6) angetrieben.If the percussion piston 3 has its return stroke (counter to the working stroke direction continues according to arrow 6), the junction 28a finally with the connected front cylinder space section 2e, which over the Cross bore 14 and the pressure medium channel 12 constantly with the working pressure is acted upon. Accordingly, SF is then also on the control surface the spool 15 of the working pressure with the result that this is in the illustration moves to the left, thereby shutting off the transverse bore 15a and releases the mouth 16a, causing the rear Cylinder chamber section 2d is placed under working pressure. Accordingly the percussion piston 3 - against that of the smaller piston area A2 outgoing restoring force - driven in the working stroke direction (arrow 6).

Kurz bevor der Schlagkolben 3 auf den nicht dargestellten Meißel auftrifft, wird über die Ringnut 3d die bereits erwähnte Verbindung zwischen der Steuerleitung 27 und über die Durchgangsbohrung 26 mit der drucklosen Rücklaufleitung 21 hergestellt mit der Folge, daß die Steuerfläche SF druckentlastet ist. Der im hinteren Zylinderraumabschnitt 2d vorhandene Arbeitsdruck greift nunmehr an einer Gesamtfläche an, die sich aus dem Größenunterschied zwischen der größeren Stimfläche S2 und der kleineren Stirnfläche S1 ergibt, und bewegt dementsprechend den Steuerschieber 15 (in der Darstellung gemäß Fig. 1 nach rechts) in Richtung auf die gezeigte Rückhubstellung, in welcher sich der Steuerschieber schließlich über seine kleinere Stirnfläche S1 an der Anschlagfläche 2f der Laufbuchse abstützt In dieser Rückhubstellung ist - wie bereits erwähnt - einerseits die Einmündung 16a in Richtung auf den Zylinderraumabschnitt 2d unterbrochen und dieser andererseits über die Bohrungen 15a und 18 an die Ablaufleitung 17 angeschlossen. Shortly before the percussion piston 3 hits the chisel, not shown, is the already mentioned connection between the Control line 27 and through the through hole 26 with the unpressurized Return line 21 produced with the result that the control surface SF is relieved of pressure. The existing in the rear cylinder space section 2d Working pressure now attacks a total area that results from the Size difference between the larger end surface S2 and the smaller one End face S1 results, and accordingly moves the control slide 15th (to the right in the illustration according to FIG. 1) in the direction of that shown Return stroke position, in which the spool finally over its smaller end face S1 is supported on the stop face 2f of the liner In As already mentioned, this return stroke position is on the one hand the junction 16a interrupted in the direction of the cylinder space section 2d and this on the other hand via the bores 15a and 18 to the drain line 17 connected.

Da das im hinteren Zylinderraumabschnitt 2d befindliche Fluid gegen den an der Querbohrung 15a erzeugten Ausströmwiderstand ausgeschoben wird, steht der hintere Zylinderraumabschnitt unter einem erhöhten Druck, wodurch der Steuerschieber 15 während des gesamten Rückhubs des Schlagkolbens 3 in der Rückhubstellung festgehalten wird.
Der Zwischenring 11 - welcher den Bewegungsspielraum des Steuerschiebers 15 in Richtung der Arbeitshubstellung festlegt - dient dabei auch der Führung des Steuerschiebers.Since the fluid located in the rear cylinder chamber section 2d is pushed out against the outflow resistance generated at the transverse bore 15a, the rear cylinder chamber section is under an increased pressure, as a result of which the control slide 15 is held in the return stroke position during the entire return stroke of the percussion piston 3.
The intermediate ring 11 - which defines the range of motion of the control slide 15 in the direction of the working stroke position - also serves to guide the control slide.

Die zuvor beschriebene Ausführungsform weist den Vorteil auf, daß das Schlagwerk eine innenliegende Laufbuchse aufweist, die mit den zugehörigen Kanälen, Bohrungen u.dgl. gesondert hergestellt und damit - mit Rücksicht auf unterschiedliche Anforderungen, die an ein Außengehäuse bzw. an ein innenliegendes Bauelement zu stellen sind - aus einem anderen Werkstoff bestehen kann als das Außengehäuse. Insbesondere läßt sich der Werkstoff für die Laufbuchse unter Berücksichtigung der Gleiteigenschaften auswählen, welche für das Außengehäuse keine Rolle spielen.
Weiterhin lassen sich die Kosten für die Herstellung des Schlagwerks dadurch reduzieren, daß insbesondere längere Kanäle - wie die Kanäle 12 und 21 - durch einfache Bearbeitung der Laufbuchsen-Außenfläche, d.h. durch Anbringen entsprechender Vertiefungen, Nuten, Abflachungen oder dergleichen, erzeugen lassen, wobei im Einbauzustand die Innenfläche des Außengehäuses einen Teil der Wandung der betreffenden Kanäle darstellt. Schließlich erleichtert die gesonderte Herstellung der Laufbuchse auch die Erzeugung bestimmter Querbohrungen (wie beispielsweise der Querbohrung 14), soweit diese lediglich Bestandteil der Laufbuchse sind und nach außen hin nicht verschlossen zu werden brauchen.
Durch die federnde Abstützung der Laufbuchse innerhalb des Außengehäuses kann die Störanfälligkeit des Schlagwerks im übrigen herabgesetzt werden. The embodiment described above has the advantage that the percussion mechanism has an inner liner which, with the associated channels, bores and the like. Manufactured separately and therefore - with due regard to different requirements that have to be placed on an outer housing or an internal component - can consist of a different material than the outer housing. In particular, the material for the liner can be selected taking into account the sliding properties, which are irrelevant for the outer housing.
Furthermore, the costs for the manufacture of the striking mechanism can be reduced in that, in particular, longer ducts - such as ducts 12 and 21 - can be produced by simply machining the outer surface of the liner, ie by providing corresponding depressions, grooves, flats or the like, in which Installed state, the inner surface of the outer housing represents part of the wall of the relevant channels. Finally, the separate manufacture of the liner also facilitates the production of certain transverse bores (such as, for example, the transverse bore 14), provided that these are only part of the liner and do not need to be closed to the outside.
The resilience of the striking mechanism can also be reduced by the resilient support of the liner within the outer housing.

Bei der Ausführungsform gemäß Fig. 2 ist die Laufbuchse 2 in axialer Richtung hydraulisch gegen das Außengehäuse 4 vorgespannt, und zwar entgegen der Arbeitshubrichtung (Pfeil 6) des Schlagkolbens 3.
Dabei stützt sich die Laufbuchse 2 entgegen der Arbeitshubrichtung unmittelbar an der Stirnfläche 5b des Hohldeckels 5 ab. Auf der gegenüberliegenden Seite begrenzt das Außengehäuse 4 über seine Schulter 4a mit der Laufbuchse oberhalb des Vorsprungs 2c eine Stützkammer 29. Diese ist über eine Längsbohrung 30 und eine als Drosselstelle wirkende Drosselbohrung 31 an den Druckmittelkanal 12 angeschlossen.
Unter Einwirkung des Arbeitsdrucks bildet sich in der Stützkammer 29 ein hydraulisches Stützfeld aus, welches die Laufbuchse 2 in der bereits beschriebenen Weise bezüglich des Außengehäuses 4 fixiert.
Die Drosselbohrung 31 dient dabei dazu, das hydraulische Stützfeld in der Stützkammer 29 bei stoßartiger Beanspruchung zu stabilisieren, und zwar dadurch, daß das in der Stützkammer 29 enthaltene Fluid aus dieser lediglich gegen den Ausströmwiderstand der Drosselbohrung 31 austreten kann.
Wie die in Rede stehende Darstellung erkennen läßt, sind auch die Bohrungen 30 und 31 gut zugänglich an der Laufbuchse 2 angeordnet und können daher auf einfache Weise hergestellt werden.In the embodiment according to FIG. 2, the liner 2 is hydraulically prestressed in the axial direction against the outer housing 4, specifically against the working stroke direction (arrow 6) of the percussion piston 3.
The liner 2 is supported against the working stroke direction directly on the end face 5b of the hollow cover 5. On the opposite side, the outer housing 4 delimits a support chamber 29 via its shoulder 4a with the liner above the projection 2c. This is connected to the pressure medium channel 12 via a longitudinal bore 30 and a throttle bore 31 acting as a throttle point.
Under the influence of the working pressure, a hydraulic support field is formed in the support chamber 29, which fixes the liner 2 with respect to the outer housing 4 in the manner already described.
The throttle bore 31 serves to stabilize the hydraulic support field in the support chamber 29 in the event of impact loads, namely in that the fluid contained in the support chamber 29 can only escape from it against the outflow resistance of the throttle bore 31.
As can be seen from the illustration in question, the bores 30 and 31 are also easily accessible on the liner 2 and can therefore be produced in a simple manner.

Ausweislich der Darstellung gemäß Fig. 3 kann die Laufbuchse 2 auch mittels eines radial asymmetrischen Druckfelds auf der dessen Kraftresultierender (angedeutet durch einen nach oben gerichteten Pfeil 32) gegenüberliegenden Seite an einem Umfangsteil 4c der Innenfläche 4b des Außengehäuses 4 in Anlage gehalten sein.
Unter Einwirkung des asymmetrischen Druckfelds ist zwischen der Laufbuchse 2 und dem Außengehäuse 4 auf der dem Umfangsteil 4c gegenüberliegenden Seite ein Spalt s vorhanden. 3, the liner 2 can also be held in contact with a peripheral part 4c of the inner surface 4b of the outer housing 4 by means of a radially asymmetrical pressure field on the side opposite the resultant force (indicated by an arrow 32 pointing upwards).
Under the action of the asymmetrical pressure field, a gap s is present between the liner 2 and the outer housing 4 on the side opposite the peripheral part 4c.

Zur Ausbildung des asymmetrischen Stützfelds ist die Laufbuchse 2 mit drei auf ihrem Umfang gegeneinander versetzten Abflachungen 2h versehen, die gemeinsam mit der Innenfläche 4b drei Druckmittelkanäle 12 bilden; von diesen geht jeweils eine Querbohrung 14 aus, die - wie bereits anhand der Fig. 1 erläutert - in den vorderen Zylinderraumabschnitt 2e einmündet. Die weiter oben erwähnte Rücklaufleitung 21 ist ebenfalls im Bereich des abstützenden Urnfangsteils 4c angeordnet. Sie wird von diesem im Zusammenwirken mit einer in die Laufbuchse 2 eingearbeiteten Längsnut gebildet.To form the asymmetrical support field, the liner 2 is with three on their circumference offset flats 2h provided form three pressure medium channels 12 together with the inner surface 4b; of these each go out of a transverse bore 14, which - as already based on the Fig. 1 explains - opens into the front cylinder space section 2e. The return line 21 mentioned above is also in the range of supporting Urnfangs 4c arranged. She is from this one Cooperation with a longitudinal groove machined into the liner 2 educated.

Die in Rede stehende Darstellung zeigt zur Erleichterung des Verständnisses zusätzlich die Lage der Durchgangsbohrung 26, der Steuerleitung 27 und der mit dieser verbundenen Durchgangsbohrung 28. Letztere ist derart angeordnet, daß ihre nach außengerichtete Mündung 28b ebenfalls im Bereich des stützenden Umfangsteils 4c liegt.
Dementsprechend kann davon abgesehen werden, die zeitweilig auch mit dem Arbeitsdruck beaufschlagte Durchgangsbohrung 28 in Richtung auf das Außengehäuse 4 zu verschließen, wodurch die Herstellung der genannten Durchgangsbohrung vereinfacht wird.The illustration in question additionally shows the position of the through bore 26, the control line 27 and the through bore 28 connected to it for ease of understanding. The latter is arranged in such a way that its outward opening 28b also lies in the region of the supporting peripheral part 4c.
Accordingly, it can be disregarded to close the through bore 28, which is also temporarily subjected to the working pressure, in the direction of the outer housing 4, which simplifies the manufacture of the said through bore.

Es versteht sich von selbst, daß die (in Fig. 1 und Fig. 2) lediglich schematisch dargestellten Bohrungen 26, 28 und 22 auf ihrer dem Schlagkolben 3 zugewandten Seite jeweils mit einer Ringnut ausgestattet sein können, welche mit dem Innenraum der Laufbuchse 2 in Verbindung steht.It goes without saying that the (in Fig. 1 and Fig. 2) only schematically illustrated bores 26, 28 and 22 on their Percussion piston 3 facing side each equipped with an annular groove can be in connection with the interior of the liner 2 stands.

Claims (12)

  1. Fluid driven percussion device (1) with a percussion piston (3), which is moveable in a working cylinder (2) and strikes against a tool, as well as a control means with a control slide (15) which is moveable relative to a housing, said percussion piston (3) having two piston surfaces of different size, between which a circumferential groove (3d) is disposed and of which the smaller piston surface (A2) active in the direction of the return stroke is constantly connected to a pressure pipe (13) standing under working pressure and the larger piston surface (A1) active in the direction of the working stroke (arrow 6) is selectively connected to the pressure pipe (13) and a run-off pipe (17) via the control means,
    wherein the control slide (15) has slide surfaces (S1, S2, SF, GF) active in the opposite direction to one another, which are constructed and subjected to pressure such that with the approach of the percussion piston (3) during the return stroke to the upper dead centre, the control slide (15) switches over through its control surface (SF), then connected to the pressure pipe (13) and active in the direction of the working stroke position, into the working stroke position, in which the working pressure is also present at the larger piston surface (A1), and with the approach of the percussion piston (3) during the working stroke to the impact point, is transferred through its control surface (SF), then connected to the pressureless run-off pipe (17), into the return stroke position, in which the subjection of the larger piston surface (A1) to the working pressure is interrupted and a connection to the run-off pipe (17) is created,
    characterised by the following measures:
    the working cylinder is constructed as a bush (2), which is disposed in an external housing (4) and on which the percussion piston (3) is supported in transverse direction via several guide sections (2a, 2b);
    the bush (2) is constructed as one part at least over such a longitudinal extension that the front guide section (2b) facing the tool and at least any further guide sections adjoining this in the direction of the return stroke, up to and including the guide section (2a) for the larger piston surface (A1), are part of the bush (2);
    the outer surface (2g) of the bush (2) facing the external housing (4) forms together with this at least one pressure medium duct (12) running in the longitudinal direction of these two parts and used for the return stroke of the percussion piston;
    the length of each respective pressure medium duct (12) subjected to the working pressure is dimensioned such that it extends over a front connection duct (14) extending therefrom with a return stroke chamber (2e) - which receives the smaller piston surface (A2) - to beyond a rear connection duct (16) extending therefrom, which is intermittently connected to a working stroke chamber (2d) receiving the larger piston surface (A1).
  2. Device according to Claim 1, characterised in that the bush (2) is prestressed flexibly in axial direction against the external housing (4) and an abutment element (5) disposed thereon.
  3. Device according to at least one of the preceding claims, characterised in that the bush (2) is prestressed mechanically in axial direction against the external housing (4) and an abutment element (5) disposed thereon.
  4. Device according to at least one of the preceding claims, characterised in that the bush (2) is prestressed hydraulically in axial direction against the external housing (4) and an abutment element (5) disposed thereon.
  5. Device according to Claim 4, characterised in that the bush (2) is hydraulically supported against the direction of the working stroke (arrow 6) of the percussion piston (3).
  6. Device according to Claim 5, characterised in that the hydraulic support field (support chamber 29) is subjected to the working pressure with a throttle point (31) being arranged in between.
  7. Device according to at least one of Claims 4 to 6, characterised in that the hydraulic support field (support chamber 29) is disposed behind the return stroke chamber (2e) - viewed in the direction of the working stroke (arrow 6) of the percussion piston (3).
  8. Device according to at least one of Claims 4 to 7, characterised in that the hydraulic support field (support chamber 29) is subjected to the working pressure via at least one pressure medium duct (12).
  9. Device according to at least one of the preceding claims, characterised in that the bush (2) is held in abutment against a circumferential part (4c) of the inside surface (4b) of the external housing (4) by means of a radially asymmetric pressure field on the side opposite its force resultant (arrow 32).
  10. Device according to Claim 9, characterised in that the bush has at least one pressure area (12) subjected to the working pressure and at least one pressure relief point (21) in the region of the supporting circumferential part (4c).
  11. Device according to at least one of Claims 9 and 10, characterised in that in the region of the supporting circumferential part (4c), the bush (2) has at least one duct (21) open in the direction of this, which forms a pressureless return pipe.
  12. Device according to at least one of the preceding claims, characterised in that the control slide (15) is constructed as a sleeve arranged parallel to the percussion piston (3) and is disposed inside the bush (2) at least on one portion of its longitudinal extension.
EP99101293A 1998-02-03 1999-01-25 Fluid driven percussion device Expired - Lifetime EP0933169B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19804078A DE19804078A1 (en) 1998-02-03 1998-02-03 Fluid powered striking mechanism
DE19804078 1998-02-03

Publications (3)

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EP0933169A2 EP0933169A2 (en) 1999-08-04
EP0933169A3 EP0933169A3 (en) 2000-11-15
EP0933169B1 true EP0933169B1 (en) 2002-06-12

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EP (1) EP0933169B1 (en)
AT (1) ATE218946T1 (en)
DE (2) DE19804078A1 (en)
ES (1) ES2177145T3 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10123202A1 (en) * 2001-05-12 2002-11-14 Krupp Berco Bautechnik Gmbh Method and device for protecting a fluid-powered striking mechanism against empty blows
DE102010029918A1 (en) * 2010-06-10 2011-12-15 Hilti Aktiengesellschaft machine tool
US9592598B2 (en) 2013-03-15 2017-03-14 Caterpillar Inc. Hydraulic hammer having impact system subassembly
US9151386B2 (en) 2013-03-15 2015-10-06 Caterpillar Inc. Accumulator membrane for a hydraulic hammer
US9555531B2 (en) 2013-03-15 2017-01-31 Caterpillar Inc. Hydraulic hammer having co-axial accumulator and piston
EP2873489B1 (en) * 2013-11-13 2018-10-24 Sandvik Mining and Construction Oy Impact device and method of dismounting the same

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4062411A (en) * 1975-12-05 1977-12-13 Gardner-Denver Company Hydraulic percussion tool with impact blow and frequency control
US4181183A (en) * 1978-01-05 1980-01-01 Nippon Pneumatic Manufacturing Co., Ltd. Impact tool
FI60151C (en) * 1979-06-26 1981-12-10 Tampella Oy Ab HYDRAULISK SLAGANORDNING
DE3400302A1 (en) * 1984-01-03 1985-08-29 Mannesmann AG, 4000 Düsseldorf HYDRAULIC ACTUATOR
DE3412187A1 (en) * 1984-04-02 1985-10-10 Rižskij politechničeskij institut imeni A. Ja. Pelše, Riga Compressed-air hammer
DE3443542A1 (en) * 1984-11-29 1986-06-05 Fried. Krupp Gmbh, 4300 Essen HYDRAULIC BEATER
DE9319223U1 (en) * 1993-12-15 1994-02-24 Walter, Hans-Philipp, 74251 Lehrensteinsfeld Hammer drill

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Publication number Publication date
DE19804078A1 (en) 1999-08-05
EP0933169A3 (en) 2000-11-15
EP0933169A2 (en) 1999-08-04
DE59901686D1 (en) 2002-07-18
ATE218946T1 (en) 2002-06-15
ES2177145T3 (en) 2002-12-01

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