EP2564985A1 - Air cushion striking mechanism for a motorised hammer drill or demolition hammer - Google Patents
Air cushion striking mechanism for a motorised hammer drill or demolition hammer Download PDFInfo
- Publication number
- EP2564985A1 EP2564985A1 EP12181795A EP12181795A EP2564985A1 EP 2564985 A1 EP2564985 A1 EP 2564985A1 EP 12181795 A EP12181795 A EP 12181795A EP 12181795 A EP12181795 A EP 12181795A EP 2564985 A1 EP2564985 A1 EP 2564985A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air cushion
- impact
- housing
- drive piston
- housing sleeve
- 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.)
- Granted
Links
- 238000005553 drilling Methods 0.000 claims abstract description 9
- 238000009527 percussion Methods 0.000 claims description 41
- 238000010304 firing Methods 0.000 claims description 22
- 230000033001 locomotion Effects 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 13
- 238000013016 damping Methods 0.000 claims description 9
- 238000013022 venting Methods 0.000 claims description 8
- 230000035939 shock Effects 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 abstract description 11
- 230000005540 biological transmission Effects 0.000 description 6
- 230000002028 premature Effects 0.000 description 4
- 238000010009 beating Methods 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D11/00—Portable percussive tools with electromotor or other motor drive
- B25D11/005—Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
- B25D2217/0011—Details of anvils, guide-sleeves or pistons
- B25D2217/0019—Guide-sleeves
-
- 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
- B25D2250/035—Bleeding holes, e.g. in piston guide-sleeves
-
- 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
- B25D2250/231—Sleeve details
- B25D2250/235—Sleeve couplings
Definitions
- the present invention relates to an air cushion percussion for a motor-driven drill or percussion hammer and a motor-driven drill or percussion hammer with an air cushion impact mechanism.
- an air impact impact mechanism essentially comprises a cylindrical tube, a drive piston which is axially movable in the tube, and a percussion body ("racket") which is also axially movable in the tube, an air cushion being enclosed in the tube between the drive piston and the impactor transfers the impact energy from the drive piston to the impactor and mechanically decouples the impactor from the drive piston.
- the drive piston is in this case driven via a connecting rod by a crankshaft, which is rotated by an electric motor, so that the drive piston in the tube performs an axially oscillating movement.
- the tool is received in a tool holder and can be driven directly by the impactor or indirectly via, for example, a striker ("striker"), which in turn is driven by the striker.
- a striker which in turn is driven by the striker.
- the moving impact mass of the impactor transmits on impact on the firing pin a pulse, which this in turn transmits to the tool.
- the firing pin also has the task to move the percussion and in particular the impactor when pressing the tool from an idle position to a working position.
- the sealing of the air cushion between the impactor and the drive piston is not absolutely leakage-free possible, so that to compensate for the leakage losses and to maintain the percussion function a ventilation of the air cushion is required.
- compensation holes are usually arranged in the wall of the tube in the region of the air cushion, which are released or closed in dependence on the axial position of the impactor and the drive piston and thereby allow ventilation of the air cushion.
- the ventilation of the air cushion is thus controlled by the impactor and possibly also by the drive piston.
- the disclosure DE 198 10 088 C1 a drill and / or percussion hammer, the housed in his housing air cushion impact comprising a reciprocating piston in a guide tube and a racket, between which an air cushion space is formed in the guide tube, which is vented in an idle position of the impact mechanism via at least one control port.
- the control opening can be closed by a control part located outside the guide tube in an impact position of the percussion mechanism in order to build up an air cushion in the air cushion space.
- the control part is formed as an annular member which is fixed to the housing and the guide tube receives axially displaceable in it.
- the guide tube is acted upon axially with the force of a return spring, which is supported on the one hand on the control part and on the other hand on a projecting on the jacket of the guide tube outwardly circumferential collar.
- the return spring tries to hold the guide tube in a front starting position, in which the control part covers the control opening.
- at least one additional opening is provided which is arranged on the tool side in front of the control openings and which is covered by the racket in impact mode. The prerequisite for the formation of an air cushion is that both the control openings and the additional openings are closed.
- the guide tube When idling, the guide tube is moved forward by a spring, so that the control port is free.
- An additional rotary drive for the tool holder via longitudinal teeth on the guide tube and a toothing between the guide tube and tool holder is a transmission of the rotational movement.
- the beater drive piston
- the seals overruns the breather bores in impact mode, which places a heavy load on the respective seal and therefore rapidly degrades the seal and decreases impact due to increased leakage leads.
- the German Utility Model DE 19 69 990 U is also a device for switching from impact drills on rotary drills and vice versa known for electro-pneumatic rotary hammers.
- the device comprises a guide sleeve with axially spaced apart ventilation holes, within which a percussion piston is received axially displaceable. This transmits its impact energy in beating operation immediately on a projecting into the cylinder space of the guide sleeve tool holder.
- the percussion piston is arranged in beating operation together with the tool holder in the cylinder chamber such that its sealing portion is located axially behind the vent holes, so that in a stroke forward towards the tool no damping this intercepting air cushion can arise while in the rear of the cylinder chamber a completed air cushion space is maintained to transmit the impact motion.
- the tool holder When idling, the tool holder is moved so far forward together with the percussion piston in the direction of the tool that the sealing portion of the percussion piston is located between the axially spaced vent holes.
- the rear vent holes serve to vent the driving air cushion space and prevent the required to drive the percussion piston pressure or negative pressure can build up. Recovery may in turn be accomplished by displacing the tool holder and percussion piston relative to the cylinder space, i. when pressing the tool, done.
- an object of the present invention to provide an air impact impactor for a power driven drill or percussion hammer, which at least reduces the known prior art disadvantages of the prior art and provides a simple and stable air cushion impact mechanism becomes.
- an air cushion impact mechanism for a motor driven drilling or percussion hammer, which comprises a two-part housing sleeve, in which at least one drive piston for the conversion of a drive energy into impact energy and at least one impactor and a firing pin for delivering the impact energy to a tool of the hammer or percussion hammer along a longitudinal axis of the housing sleeve are movably received.
- a switching device allows switching of the impact mechanism between an idling operation and a percussion operation, wherein in the impact mode between the drive piston and the impactor a first air cushion for transmitting the impact energy from the drive piston can be formed on the impactor and in idle operation, a second air cushion for impact damping between the Impact body and the firing pin can be formed, and wherein the housing sleeve has at least one first vent for venting the first air cushion and at least one second vent for venting the second air cushion.
- both parts of the housing sleeve according to the invention along its longitudinal axis are displaceable relative to each other, both parts of the housing sleeve having at least one vent hole, which are at least partially aligned with each other in a first position of the housing parts to each other to jointly form the second vent and a vent of the second Allow air cushion, and are closed in a second position respectively by the other part of the housing sleeve to allow a shock absorption.
- the housing sleeve is formed in two parts, wherein the second vent opening is formed only by the fact that the two housing parts occupy a particular position relative to each other, in which the respectively formed on the housing parts vent holes are aligned and thus form the second vent opening.
- the second air cushion is not for the transmission of impact energy, but for damping a shock from the racket on the Firing pin provided. This is particularly desirable when idling the racket or the drive piston trailing.
- blows of the impact mechanism to reduce the resulting significant burden of percussion components and avoid premature failure of the air cushion impact mechanism.
- the two housing parts are shifted from each other so that their respective vent holes offset from each other and so no air can escape from the space between the racket and the firing pin.
- the drive piston can therefore reach no compression of the air, which further shocks (blanking) can be avoided.
- the two housing parts When switching with the aid of the switching device from the idle mode to the impact mode, the two housing parts are shifted from each other so that the vent holes of the two housing parts are at least partially aligned with each other and together form the second vent for venting the second air cushion.
- the air cushion formed for shock absorption can be vented and beat the bat on the firing pin to transfer the impact energy from the drive piston to the tool.
- the drive piston and the impactor body may each have a sealing portion, which in sealing contact with the inner circumference of the housing sleeve is to limit between them the air cushion within the housing sleeve.
- the two-part housing sleeve may have a guide which allows an axial movement of the two housing parts relative to each other and blocks a radial movement of the two housing parts relative to each other.
- This is particularly desirable when the air cushion impact mechanism is used in a hammer drill, which is not only a beating movement (chisel operation), but also a rotary motion (drilling operation) to transfer to the tool.
- a toothing in which engages a drive wheel of the hammer drill.
- the rotational movement can be transmitted from the housing sleeve to the tool via a toothing.
- the guide is provided which allows transmission of the rotational movement of the drive-facing part of the housing sleeve on the tool-facing part of the housing sleeve.
- the guide may comprise according to an embodiment of the invention at least one guide pin on one of the housing parts, which is guided in a guide groove on the other of the housing parts.
- the guide groove may be formed in particular as a slot in the wall of one of the housing parts, in which the guide pin is guided.
- an elastic return element can be provided which is suitable for holding the two housing parts in one of the two positions or returning them to one of the two positions.
- the elastic return element may comprise a spring which biases the two housing parts in one of the two positions against each other.
- an air cushion impact mechanism which comprises a housing sleeve in which at least one drive piston for converting a drive energy into impact energy and at least one impact body for delivering the impact energy to a tool of the hammer or percussion hammer with a between the air piston located to the drive piston and the impactor for the transmission of the impact energy of the drive piston on the striker along a longitudinal axis of the housing sleeve are movably received.
- the air cushion percussion mechanism further comprises a switching device, which allows switching of the percussion mechanism between an idling operation and a striking operation, wherein the housing sleeve has at least one vent opening for venting the air cushion.
- the at least one vent opening according to the invention in the impact mode of drilling or percussion hammer along the longitudinal axis of the housing sleeve is arranged offset to the air cushion, so that the air cushion between the drive piston and the impactor is maintained, and the switching device is capable of switching to idle operation the impactor and / or axially displace the drive piston relative to the vent opening so that the air cushion can be vented through the vent opening during idling operation of the impact mechanism.
- the switching device may also include a striker (striker), which is driven in impact mode by the striker (racket) and emits the impact energy to the tool. If the tool is pressed against a resistance, firing pin and racket from the idle position of the air cushion impact mechanism to the rear, d. H. towards the drive piston within the housing sleeve, moved. As a result, the drive piston can be brought into a position in which the air cushion between the drive piston and the racket can be vented via the at least one vent opening.
- striker shtriker
- the invention further relates to a motor-driven drilling or percussion hammer with an air cushion impact mechanism with the above features.
- FIG. 1 a side view of the air cushion impact mechanism according to the invention, wherein the air cushion impact mechanism is generally designated by the reference numeral 10.
- the air cushion impact mechanism is generally designated by the reference numeral 10.
- adjoining components of a power driven hammer or percussion hammers and the attached tool in the FIG. 1 not shown.
- the air cushion impact mechanism 10 can be used both for a hammer drill, d. H. a driven hammer, which can also transmit a rotary motion to the tool, as well as used in a percussion hammer.
- the corresponding motor drive takes place for example via an electric motor, which can be connected to a battery or a power line as a power source.
- the air cushion impact mechanism 10 includes a housing 12 in which an axially movable drive piston (not shown), an axially movable impactor or racket 20 and a axially movable striker or striker 30 along a longitudinal axis L of the housing 12 back and forth are movably received.
- the housing 12 is sleeve-shaped and comprises two housing parts 14 and 16, which are axially displaceable relative to each other along the longitudinal axis L.
- a front ie the tool facing the end of the second housing part 16 is received, as in particular in FIGS. 2 to 4 is clearly visible.
- front refers to the end of the impact mechanism facing the tool (in FIG. 1 and 3a - 4 right), while “back” denotes the opposite end (in FIG. 1 and 3a - 4 left is.
- axial and radial in the present description are each related to the longitudinal axis L.
- the axially movable within the second housing part 16 drive piston (not shown) transmits via a trapped between the drive piston and the impactor 20, first air cushion 80 a striking energy, which drives the striker 20 in the direction of the firing pin 30.
- the drive piston is in this case driven, for example via a connecting rod by a crankshaft, which is rotated by the electric motor, so that the drive piston in the housing 12 performs an axially oscillating movement. In the same way, driven by the first air cushion 80, the striker 20 moves.
- the racket 20 has a sealing groove 22 in which a sealing element, for example an elastic sealing ring 52 (cf. FIG. 3a ), which is on the inner peripheral surface of the second housing part 16 abuts and thereby achieves a seal of the air cushion 80.
- a sealing element for example an elastic sealing ring 52 (cf. FIG. 3a ), which is on the inner peripheral surface of the second housing part 16 abuts and thereby achieves a seal of the air cushion 80.
- the drive piston may comprise a sealing element.
- the impactor 20 in turn drives the firing pin 30.
- the moving impact mass of the impactor 20 transmits upon impact with the firing pin a pulse, which this in turn on a tool 36 (FIG. FIG. 4 ) transmits.
- the tool 36 is attached to a tool holder 34 which is formed separately from the striker 30. Alternatively, however, other design options are conceivable.
- the tool holder 34 At rest, the tool holder 34 is located with its inclined contact surface 30a (see. FIG. 4 ) on a corresponding contact shoulder 12a of the housing sleeve 12 (cf. FIGS. 3a and 3b ). If a surface is now to be machined with the aid of the motor-driven drilling or percussion hammer, the tool 36 is pushed backwards, ie in the direction of the impactor 20, as a result of the resistance of this surface to be machined. In response, the striker 30 also displaces the striker 20 rearwardly and thus moves it from an idle position to a working position, as described in more detail below.
- a rebound damping with an elastic damping element 60, a bearing sleeve 62 for supporting the firing pin 30 and a stop plate 64 is provided.
- the elastic damping element 60 can also assume a sealing function, but essentially serves to damp a return pulse from the firing pin 30 on the stop plate 64.
- seals 54 and 56 are also seals 54 and 56 (FIGS. FIG. 3a )intended.
- the second air cushion 40 unlike the first air cushion 80 between the drive piston and the striker 20 is not intended to transmit a drive pulse, but instead damps a shock of the impactor 20 and so a transmission from the striker 20 to the striker 30 at idle to prevent the machine. This is particularly desirable when idle the percussion 10 of the striker 20 and the drive piston trailing. Here blank clearances of the impact mechanism 10 are to be prevented in order to reduce the resulting significant loads of percussion components, such as the impactor 20 and striker 30, and to avoid premature failure of the air cushion impact mechanism 10.
- the housing 12 on its housing parts 14 and 16 more vents 12b and 50 on.
- the first vent openings 50 which are arranged axially with respect to the tool 36 further back, serve for ventilation of the rear ie first air cushion 80, wherein the first air cushion 80 is to be vented at idle of the impact mechanism 10.
- the vent holes or vents 50 are formed on the second housing part 16 such that they are arranged offset in a drive position or impact position of the striking mechanism 10 relative to the air cushion 80 (see, for example FIG. 4 , here the vents 50 are arranged axially in front of the seal 52 of the racket 20).
- the drive piston moves the striker 20 in a last blank in the direction forward until the firing pin 30 comes with its contact surface 30a on the shoulder 12a of the housing sleeve 12 to the plant.
- the racket 20 passes over with its seal 52, the ventilation openings 50, whereby the first air cushion 80 is also displaced forward and can be vented through the vents 50.
- the front, second vent openings 12b shown are formed by vent holes in the respective housing parts 14 and 16.
- the first housing part 14 and the second housing part 16 each have vent holes 14b and 16b, which in an idle position (see. FIG. 3b ) are arranged offset relative to each other, whereby the second air cushion 40 is substantially sealed and allows damping of voids of the racket 20.
- an impact position of the air cushion impact mechanism 10 see. FIG.
- the two housing parts 14 and 16 are axially displaced relative to each other so that the two respective vent holes 14b and 16b at least partially aligned with each other and thereby together form the second vent openings 12b, through which the second air cushion 40 can be vented (indicated by the with Lu designated arrows in FIG. 4 ).
- guide grooves 14a are provided in the first housing part, engage in the corresponding guide pins 16a of the second housing part. Furthermore, between the housing part 14 and 16, a return spring 18 ( FIGS. 1 . 3a - 4 ) is provided, which in a relative movement of the housing parts 14 and 16 in a position in which the second ventilation holes 14b and 16b are aligned with each other, is biased. Then, when the air bag impact mechanism 10 enters a state of idling, in which the second vent holes 14b and 16b are not aligned with each other, the housing parts 14 and 16 are reset by means of the stored spring force. This is too Note that by pressing the tool (in the working position) and the front, first housing part 14 performs a relative movement in the direction of the second, rear housing part 16.
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- Percussive Tools And Related Accessories (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft ein Luftpolster-Schlagwerk für einen motorisch angetriebenen Bohr- oder Schlaghammer sowie einen motorisch angetriebenen Bohr- oder Schlaghammer mit einem Luftpolster-Schlagwerk.The present invention relates to an air cushion percussion for a motor-driven drill or percussion hammer and a motor-driven drill or percussion hammer with an air cushion impact mechanism.
Bei herkömmlichen elektro-pneumatischen Bohr- oder Meißelhämmern wird eine Schlagenergie durch Umwandlung einer Antriebsenergie mittels eines so genannten Luftpolster-Schlagwerks erzeugt. Ein solches Luftpolster-Schlagwerk umfasst im Wesentlichen ein zylindrisches Rohr, einen in dem Rohr axial beweglichen Antriebskolben sowie einen ebenfalls in dem Rohr axial beweglichen Schlagkörper ("Schläger"), wobei in dem Rohr zwischen dem Antriebskolben und dem Schlagkörper ein Luftpolster eingeschlossen ist, das die Schlagenergie von dem Antriebskolben auf den Schlagkörper überträgt und den Schlagkörper mechanisch von dem Antriebskolben entkoppelt.In conventional electro-pneumatic drilling or chipping hammers a striking energy is generated by converting a driving energy by means of a so-called air cushion impact mechanism. Such an air impact impact mechanism essentially comprises a cylindrical tube, a drive piston which is axially movable in the tube, and a percussion body ("racket") which is also axially movable in the tube, an air cushion being enclosed in the tube between the drive piston and the impactor transfers the impact energy from the drive piston to the impactor and mechanically decouples the impactor from the drive piston.
Der Antriebskolben wird hierbei über eine Pleuelstange von einer Kurbelwelle angetrieben, die von einem Elektromotor gedreht wird, so dass der Antriebskolben in dem Rohr eine axial oszillierende Bewegung ausführt.The drive piston is in this case driven via a connecting rod by a crankshaft, which is rotated by an electric motor, so that the drive piston in the tube performs an axially oscillating movement.
Das Werkzeug ist in einer Werkzeugaufnahme aufgenommen und kann direkt von dem Schlagkörper oder indirekt über z.B. einen Schlagbolzen ("Döpper") angetrieben werden, der seinerseits von dem Schlagkörper angetrieben wird. In letzterem Fall überträgt die bewegte Schlagmasse des Schlagkörpers beim Aufschlag auf den Schlagbolzen einen Impuls, den dieser seinerseits auf das Werkzeug überträgt. Der Schlagbolzen hat zudem die Aufgabe, das Schlagwerk und insbesondere den Schlagkörper beim Anpressen des Werkzeugs von einer Leerlaufstellung in eine Arbeitsstellung zu bewegen.The tool is received in a tool holder and can be driven directly by the impactor or indirectly via, for example, a striker ("striker"), which in turn is driven by the striker. In the latter case, the moving impact mass of the impactor transmits on impact on the firing pin a pulse, which this in turn transmits to the tool. The firing pin also has the task to move the percussion and in particular the impactor when pressing the tool from an idle position to a working position.
Die Abdichtung des Luftpolsters zwischen dem Schlagkörper und dem Antriebskolben ist hierbei nicht absolut leckage-frei möglich, so dass zum Ausgleich der Leckage-Verluste und zur Aufrechterhaltung der Schlagwerksfunktion eine Be- und Entlüftung des Luftpolsters erforderlich ist. Hierzu sind in der Wandung des Rohrs üblicherweise im Bereich des Luftpolsters Ausgleichsbohrungen angeordnet, die in Abhängigkeit von der axialen Stellung des Schlagkörpers und des Antriebskolbens freigegeben oder verschlossen werden und dadurch eine Be- und Entlüftung des Luftpolsters ermöglichen. Bei den bekannten Luftpolster-Schlagwerken wird die Be- und Entlüftung des Luftpolsters also durch den Schlagkörper und unter Umständen auch durch den Antriebskolben gesteuert.The sealing of the air cushion between the impactor and the drive piston is not absolutely leakage-free possible, so that to compensate for the leakage losses and to maintain the percussion function a ventilation of the air cushion is required. For this purpose, compensation holes are usually arranged in the wall of the tube in the region of the air cushion, which are released or closed in dependence on the axial position of the impactor and the drive piston and thereby allow ventilation of the air cushion. In the known air cushion impactors the ventilation of the air cushion is thus controlled by the impactor and possibly also by the drive piston.
So offenbart die
Weiterhin offenbart die
Schließlich offenbart die
Bei allen vorstehend genannten Vorrichtungen aus dem Stand der Technik überfährt der Schläger bzw. Schlagkolben (Antriebskolben) mit seinen Dichtungen die Entlüftungsbohrungen im Schlagbetrieb, was eine starke Belastung der entsprechenden Dichtung darstellt und daher schnell zu Verschleiß der Dichtung und zu einer sinkenden Schlagleistung aufgrund höherer Leckage führt.In all of the above-mentioned prior art devices, the beater (drive piston) with its seals overruns the breather bores in impact mode, which places a heavy load on the respective seal and therefore rapidly degrades the seal and decreases impact due to increased leakage leads.
Ein weiterer aus der Praxis bekannter Nachteil im Zusammenhang mit dem zwischen dem Schlagkörper und dem Werkzeug angeordneten Schlagbolzen besteht darin, dass dann wenn die der Bohr- oder Schlaghammer mit seinem Werkzeug nicht mehr gegen das zu bearbeitende Werkstück (Widerstand) gedrückt wird und somit von einer Schlagstellung in eine Leerlaufstellung überführt wird, der nachlaufende Schlagkörper Leerschläge auf den Schlagbolzen überträgt. Hierdurch werden die Schlagwerksbauteile erheblich belastet, was zu deren frühzeitigem Versagen führen kann.Another disadvantage known from practice in connection with the arranged between the impactor and the tool firing pin is that when the drill or percussion hammer with his tool is no longer pressed against the workpiece to be machined (resistance) and thus of a Impact position is transferred to an idle position, the trailing striking body transfers blank beats on the firing pin. As a result, the percussion components are significantly burdened, which can lead to their premature failure.
Aus dem Stand der Technik sind unterschiedliche Methoden zum Abfangen derartiger Leerschläge des Schlagkörpers bekannt, unter anderem das Vorsehen eines Fangrings, der den Schlagkörper in der Leerlaufstellung festhält. Dieser ist jedoch seinerseits hohen Belastungen ausgesetzt, was oftmals zuerst zu einem Versagen des Fangrings und in Folge dessen zu einer erhöhten Belastung der Schlagwerksbauteile und gegebenenfalls deren frühzeitigen Versagen führt.Various methods for intercepting such blank beats of the impactor are known from the prior art, including the provision of a catch ring that holds the striker in the neutral position. However, this in turn is exposed to high loads, which often leads first to a failure of the catch ring and as a result to an increased burden on the percussion components and possibly their premature failure.
Aus der deutschen Gebrauchsmusterschrift
Beim Leerlauf wird der Werkzeughalter zusammen mit dem Schlagkolben so weit nach vorne in Richtung zu dem Werkzeug verschoben, dass sich der Dichtabschnitt des Schlagkolbens zwischen den axial beabstandeten Entlüftungsbohrungen befindet. Die hinteren Entlüftungsbohrungen dienen dabei zum Entlüften des antreibenden Luftkissenraums und verhindern, dass sich der zum Antrieb des Schlagkolbens erforderliche Über- bzw. Unterdruck aufbauen kann. Eine Rückstellung kann wiederum durch Verschieben des Werkzeughalters und des Schlagkolbens relativ zu dem Zylinderraum, d.h. beim Andrücken des Werkzeugs, erfolgen.When idling, the tool holder is moved so far forward together with the percussion piston in the direction of the tool that the sealing portion of the percussion piston is located between the axially spaced vent holes. The rear vent holes serve to vent the driving air cushion space and prevent the required to drive the percussion piston pressure or negative pressure can build up. Recovery may in turn be accomplished by displacing the tool holder and percussion piston relative to the cylinder space, i. when pressing the tool, done.
Demgemäß besteht eine Aufgabe der vorliegenden Erfindung darin, ein Luftpolster-Schlagwerk für einen motorisch angetriebenen Bohr- oder Schlaghammer bereit zu stellen, bei dem die aus der Praxis bekannten Nachteile des Stands der Technik zumindest verringert werden und ein möglichst einfaches und standfestes Luftpolster-Schlagwerk bereitgestellt wird.Accordingly, it is an object of the present invention to provide an air impact impactor for a power driven drill or percussion hammer, which at least reduces the known prior art disadvantages of the prior art and provides a simple and stable air cushion impact mechanism becomes.
Die vorstehend genannte Aufgabe wird durch ein Luftpolster-Schlagwerk mit den Merkmalen des Anspruchs 1 gelöst.The above object is achieved by an air cushion impact mechanism with the features of claim 1.
Demgemäß wird ein Luftpolster-Schlagwerk für einen motorisch angetriebenen Bohr- oder Schlaghammer bereitgestellt, das eine zweiteilige Gehäusehülse umfasst, in der zumindest ein Antriebskolben zur Umwandlung einer Antriebsenergie in Schlagenergie sowie wenigstens ein Schlagkörper und ein Schlagbolzen zur Abgabe der Schlagenergie an ein Werkzeug des Bohr- oder Schlaghammers entlang einer Längsachse der Gehäusehülse bewegbar aufgenommen sind. Dabei ermöglicht eine Schalteinrichtung ein Umschalten des Schlagwerks zwischen einem Leerlaufbetrieb und einem Schlagbetrieb, wobei im Schlagbetrieb zwischen dem Antriebskolben und dem Schlagkörper ein erstes Luftpolster zur Übertragung der Schlagenergie von dem Antriebskolben auf den Schlagkörper ausgebildet werden kann sowie im Leerlaufbetrieb ein zweites Luftpolster zur Schlagdämpfung zwischen dem Schlagkörper und dem Schlagbolzen ausgebildet werden kann, und wobei die Gehäusehülse wenigstens eine erste Entlüftungsöffnung zum Entlüften des ersten Luftpolsters sowie wenigstens eine zweite Entlüftungsöffnung zum Entlüften des zweiten Luftpolsters aufweist. Ferner sind die beiden Teile der Gehäusehülse erfindungsgemäß entlang ihrer Längsachse relativ zueinander verschiebbar, wobei beide Teile der Gehäusehülse wenigstens eine Entlüftungsbohrung aufweisen, die in einer ersten Stellung der Gehäuseteile zueinander wenigstens teilweise miteinander fluchten, um gemeinsam die zweite Entlüftungsöffnung zu bilden und eine Entlüftung des zweiten Luftpolsters zu ermöglichen, und in einer zweiten Stellung jeweils durch den anderen Teil der Gehäusehülse verschlossen werden, um eine Schlagdämpfung zu ermöglichen.Accordingly, an air cushion impact mechanism is provided for a motor driven drilling or percussion hammer, which comprises a two-part housing sleeve, in which at least one drive piston for the conversion of a drive energy into impact energy and at least one impactor and a firing pin for delivering the impact energy to a tool of the hammer or percussion hammer along a longitudinal axis of the housing sleeve are movably received. In this case, a switching device allows switching of the impact mechanism between an idling operation and a percussion operation, wherein in the impact mode between the drive piston and the impactor a first air cushion for transmitting the impact energy from the drive piston can be formed on the impactor and in idle operation, a second air cushion for impact damping between the Impact body and the firing pin can be formed, and wherein the housing sleeve has at least one first vent for venting the first air cushion and at least one second vent for venting the second air cushion. Furthermore, the two parts of the housing sleeve according to the invention along its longitudinal axis are displaceable relative to each other, both parts of the housing sleeve having at least one vent hole, which are at least partially aligned with each other in a first position of the housing parts to each other to jointly form the second vent and a vent of the second Allow air cushion, and are closed in a second position respectively by the other part of the housing sleeve to allow a shock absorption.
Bei der Erfindung ist die Gehäusehülse zweiteilig ausgebildet, wobei die zweite Entlüftungsöffnung erst dadurch gebildet wird, dass die beiden Gehäuseteile eine besondere Stellung relativ zueinander einnehmen, in der die jeweils an den Gehäuseteilen ausgebildeten Entlüftungsbohrungen miteinander fluchten und so die zweite Entlüftungsöffnung bilden. Weiterhin ist das zweite Luftpolster nicht zur Übertragung einer Schlagenergie, sondern zur Dämpfung eines Schlags von dem Schläger auf den Schlagbolzen vorgesehen. Dies ist insbesondere dann erwünscht, wenn im Leerlauf der Schläger bzw. der Antriebskolben nachlaufen. Hier sollen Leerschläge des Schlagwerks verhindert werden, um die daraus resultierende erhebliche Belastung der Schlagwerksbauteile zu mindern und ein frühzeitiges Versagen des Luftpolster-Schlagwerks vermeiden.In the invention, the housing sleeve is formed in two parts, wherein the second vent opening is formed only by the fact that the two housing parts occupy a particular position relative to each other, in which the respectively formed on the housing parts vent holes are aligned and thus form the second vent opening. Furthermore, the second air cushion is not for the transmission of impact energy, but for damping a shock from the racket on the Firing pin provided. This is particularly desirable when idling the racket or the drive piston trailing. Here are to avoid blows of the impact mechanism to reduce the resulting significant burden of percussion components and avoid premature failure of the air cushion impact mechanism.
In der Leerlaufstellung sind die beiden Gehäuseteile so gegeneinander verschoben, dass ihre jeweiligen Entlüftungsbohrungen versetzt zueinander stehen und so keine Luft aus dem Raum zwischen dem Schläger und dem Schlagbolzen entweichen kann. Dadurch bildet sich in diesem Raum ein Überdruck aus (zweites Luftpolster), der den Schläger abbremst und daran hindert, auf den Schlagbolzen zu schlagen. Er bewegt sich jedoch so weit nach vorne, dass er die hintere Entlüftungsöffnung mit seiner Dichtung überschreitet und dadurch ein Luftausgleich im ersten Luftpolster zwischen Antriebskolben und Schläger stattfinden kann. Der Antriebskolben kann deshalb keine Kompression der Luft erreichen, wodurch weitere Schläge (Leerschläge) vermieden werden.In the neutral position, the two housing parts are shifted from each other so that their respective vent holes offset from each other and so no air can escape from the space between the racket and the firing pin. This creates an overpressure in this room (second air cushion), which slows down the racket and prevents it from hitting the firing pin. However, he moves so far forward that he exceeds the rear vent with its seal and thus an air balance in the first air cushion between drive piston and racket can take place. The drive piston can therefore reach no compression of the air, which further shocks (blanking) can be avoided.
Bei einem Umschalten mit Hilfe der Schalteinrichtung aus dem Leerlaufbetrieb in den Schlagbetrieb werden die beiden Gehäuseteile so zueinander verschoben, dass die Entlüftungsbohrungen der beiden Gehäuseteile zumindest teilweise miteinander fluchten und so gemeinsam die zweite Entlüftungsöffnung zum Entlüften des zweiten Luftpolsters ausbilden. Auf diese Weise kann das zur Schlagdämpfung ausgebildete Luftpolster entlüftet werden und der Schläger auf den Schlagbolzen schlagen, um die Schlagenergie von dem Antriebskolben auf das Werkzeug zu übertragen.When switching with the aid of the switching device from the idle mode to the impact mode, the two housing parts are shifted from each other so that the vent holes of the two housing parts are at least partially aligned with each other and together form the second vent for venting the second air cushion. In this way, the air cushion formed for shock absorption can be vented and beat the bat on the firing pin to transfer the impact energy from the drive piston to the tool.
Weiterhin können der Antriebskolben und der Schlagkörper jeweils einen Dichtabschnitt aufweisen, der in dichtendem Kontakt mit dem Innenumfang der Gehäusehülse steht, um zwischen sich das Luftpolster innerhalb der Gehäusehülse zu begrenzen.Furthermore, the drive piston and the impactor body may each have a sealing portion, which in sealing contact with the inner circumference of the housing sleeve is to limit between them the air cushion within the housing sleeve.
Ferner kann die zweiteilige Gehäusehülse eine Führung aufweisen, die eine axiale Bewegung der beiden Gehäuseteile relativ zueinander ermöglicht und eine radiale Bewegung der beiden Gehäuseteile relativ zueinander sperrt. Dies ist insbesondere dann wünschenswert, wenn das Luftpolster-Schlagwerk bei einem Bohrhammer eingesetzt wird, der nicht nur eine schlagende Bewegung (Meißelbetrieb), sondern auch eine Drehbewegung (Bohrbetrieb) auf das Werkzeug übertragen soll. Dies geschieht beispielsweise durch eine Übertragung eines Antriebsdrehmoments auf die zweiteilige Gehäusehülse, welche ihrerseits die Drehbewegung an das Werkzeug abzugeben vermag. Hierfür kann beispielsweise an der Außenseite der Gehäusehülse eine Verzahnung vorgesehen sein, in die ein Antriebsrad des Bohrhammers eingreift. Gleichermaßen kann über eine Verzahnung die Drehbewegung von der Gehäusehülse auf das Werkzeug übertragen werden. Damit jedoch auch die Gehäuseteile zueinander drehfest sind, ist die Führung vorgesehen, die eine Übertragung der Drehbewegung von dem dem Antrieb zugewandten Teil der Gehäusehülse auf den dem Werkzeug zugewandten Teil der Gehäusehülse ermöglicht.Furthermore, the two-part housing sleeve may have a guide which allows an axial movement of the two housing parts relative to each other and blocks a radial movement of the two housing parts relative to each other. This is particularly desirable when the air cushion impact mechanism is used in a hammer drill, which is not only a beating movement (chisel operation), but also a rotary motion (drilling operation) to transfer to the tool. This happens for example by a transmission of a drive torque to the two-piece housing sleeve, which in turn is able to deliver the rotational movement of the tool. For this purpose, for example, be provided on the outside of the housing sleeve a toothing, in which engages a drive wheel of the hammer drill. Similarly, the rotational movement can be transmitted from the housing sleeve to the tool via a toothing. However, so that the housing parts are non-rotatable to each other, the guide is provided which allows transmission of the rotational movement of the drive-facing part of the housing sleeve on the tool-facing part of the housing sleeve.
Die Führung kann gemäß einer Ausführungsform der Erfindung wenigstens einen Führungsstift an einem der Gehäuseteile umfassen, der in einer Führungsnut an dem anderen der Gehäuseteile geführt ist. Dabei kann die Führungsnut insbesondere als Langloch in der Wandung eines der Gehäuseteile ausgebildet sein, in dem der Führungsstift geführt ist.The guide may comprise according to an embodiment of the invention at least one guide pin on one of the housing parts, which is guided in a guide groove on the other of the housing parts. In this case, the guide groove may be formed in particular as a slot in the wall of one of the housing parts, in which the guide pin is guided.
Weiterhin kann ein elastisches Rückstellelement vorgesehen sein, das geeignet ist, die beiden Gehäuseteile in einer der beiden Stellungen zu halten oder in eine der beiden Stellungen zurückzustellen.Furthermore, an elastic return element can be provided which is suitable for holding the two housing parts in one of the two positions or returning them to one of the two positions.
Bevorzugt kann das elastische Rückstellelement eine Feder umfassen, die die beiden Gehäuseteile in eine der beiden Stellungen gegeneinander vorspannt.Preferably, the elastic return element may comprise a spring which biases the two housing parts in one of the two positions against each other.
Gemäß einem weiteren Aspekt der Erfindung kann alternativ ein Luftpolster-Schlagwerk vorgesehen sein, das eine Gehäusehülse umfasst, in der zumindest ein Antriebskolben zur Umwandlung einer Antriebsenergie in Schlagenergie sowie wenigstens ein Schlagkörper zur Abgabe der Schlagenergie an ein Werkzeug des Bohr- oder Schlaghammers mit einem zwischen dem Antriebskolben und dem Schlagkörper befindlichen Luftpolster zur Übertragung der Schlagenergie von dem Antriebskolben auf den Schlagkörper entlang einer Längsachse der Gehäusehülse bewegbar aufgenommen sind. Das Luftpolster-Schlagwerk umfasst ferner eine Schalteinrichtung, die ein Umschalten des Schlagwerks zwischen einem Leerlaufbetrieb und einem Schlagbetrieb ermöglicht, wobei die Gehäusehülse wenigstens eine Entlüftungsöffnung zum Entlüften des Luftpolsters aufweist. Die wenigstens eine Entlüftungsöffnung ist erfindungsgemäß im Schlagbetrieb des Bohr- oder Schlaghammers entlang der Längsachse der Gehäusehülse versetzt zu dem Luftpolster angeordnet, so dass das Luftpolster zwischen dem Antriebskolben und dem Schlagkörper aufrechterhalten bleibt, und die Schalteinrichtung vermag bei einem Umschalten in den Leerlaufbetrieb den Schlagkörper und/oder den Antriebskolben axial derart relativ zu der Entlüftungsöffnung zu verschieben, dass das Luftpolster im Leerlaufbetrieb des Schlagwerks durch die Entlüftungsöffnung entlüftet werden kann.According to a further aspect of the invention, alternatively, an air cushion impact mechanism may be provided which comprises a housing sleeve in which at least one drive piston for converting a drive energy into impact energy and at least one impact body for delivering the impact energy to a tool of the hammer or percussion hammer with a between the air piston located to the drive piston and the impactor for the transmission of the impact energy of the drive piston on the striker along a longitudinal axis of the housing sleeve are movably received. The air cushion percussion mechanism further comprises a switching device, which allows switching of the percussion mechanism between an idling operation and a striking operation, wherein the housing sleeve has at least one vent opening for venting the air cushion. The at least one vent opening according to the invention in the impact mode of drilling or percussion hammer along the longitudinal axis of the housing sleeve is arranged offset to the air cushion, so that the air cushion between the drive piston and the impactor is maintained, and the switching device is capable of switching to idle operation the impactor and / or axially displace the drive piston relative to the vent opening so that the air cushion can be vented through the vent opening during idling operation of the impact mechanism.
Die Besonderheit beim Luftpolster-Schlagwerk gemäß diesem weiteren Aspekt der Erfindung ist somit darin zu sehen, dass die Dichtung des Antriebskolbens nur bei einem Umschalten von dem Leerlaufbetrieb auf den Schlagbetrieb und umgekehrt die Entlüftungsbohrungen bzw. Entlüftungsöffnungen überfahren muss. Hierdurch wird eine deutlich verringerte Belastung der Dichtung des Antriebskolbens erreicht, was die Standzeit des Luftpolster-Schlagwerks gegenüber dem Stand der Technik maßgeblich erhöht.The peculiarity of the air cushion impact mechanism according to this further aspect of the invention is thus to be seen in the fact that the seal of the drive piston only has to drive over the vent holes or ventilation openings when switching from the idling mode to the striking mode and vice versa. As a result, a significantly reduced burden on the seal reaches the drive piston, which significantly increases the service life of the air cushion impact mechanism over the prior art.
Alternativ oder zusätzlich kann die Schalteinrichtung auch einen Schlagbolzen (Döpper) umfassen, der im Schlagbetrieb von dem Schlagkörper (Schläger) angetrieben wird und die Schlagenergie an das Werkzeug abgibt. Wird das Werkzeug gegen einen Widerstand gedrückt, werden Schlagbolzen und Schläger aus der Leerlaufstellung des Luftpolster-Schlagwerks nach hinten, d. h. in Richtung zu dem Antriebskolben innerhalb der Gehäusehülse, verschoben. Dadurch kann der Antriebskolben in eine Position gebracht werden, in der das Luftpolster zwischen dem Antriebskolben und dem Schläger über die wenigstens eine Entlüftungsöffnung entlüftet werden kann.Alternatively or additionally, the switching device may also include a striker (striker), which is driven in impact mode by the striker (racket) and emits the impact energy to the tool. If the tool is pressed against a resistance, firing pin and racket from the idle position of the air cushion impact mechanism to the rear, d. H. towards the drive piston within the housing sleeve, moved. As a result, the drive piston can be brought into a position in which the air cushion between the drive piston and the racket can be vented via the at least one vent opening.
Die Erfindung betrifft ferner einen motorisch angetriebenen Bohr- oder Schlaghammer mit einem Luftpolster-Schlagwerk mit den vorstehend genannten Merkmalen.The invention further relates to a motor-driven drilling or percussion hammer with an air cushion impact mechanism with the above features.
Die Erfindung wird nachfolgend unter Bezugnahme auf die beigefügten Figuren detailliert beschrieben, die eine bevorzugte Ausführungsform der Erfindung darstellen. Der Fachmann wird die in den Zeichnungen, der Beschreibung und den Ansprüchen in Kombination miteinander offenbarten Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenzufassen.The invention will be described in detail below with reference to the accompanying figures, which illustrate a preferred embodiment of the invention. The person skilled in the art will expediently also individually consider the features disclosed in the drawings, the description and the claims in combination with one another and combine these into meaningful further combinations.
Es zeigen schematisch:
- Figur 1
- eine Seitenansicht eines erfindungsgemäßen Luftpolster-Schlagwerks;
- Figur 2
- einen Querschnitt durch das erfindungsgemäße Luftpolster-Schlagwerk der
Figur 1 entlang der Linie II-II derFigur 3a ; - Figur 3a
- eine längsgeschnittene Ansicht des erfindungsgemäßen Luftpolster-Schlagwerks der
Figuren 1 und 2 entlang der Linie IIIa-IIIa derFigur 2 im Leerlaufbetrieb; - Figur 3b
- einen Längsschnitt des erfindungsgemäßen Luftpolster-Schlagwerks der
Figuren 1 und 2 entlang der Linie IIIb-IIIb derFigur 2 im Leerlaufbetrieb; und - Figur 4
- einen Längsschnitt des erfindungsgemäßen Luftpolster-Schlagwerks gemäß der
Figur 3a , wobei das Luftpolster-Schlagwerk sich in der Schlagstellung befindet.
- FIG. 1
- a side view of an air cushion impact mechanism according to the invention;
- FIG. 2
- a cross section through the air cushion impact mechanism according to the invention
FIG. 1 along the line II-II ofFIG. 3a ; - FIG. 3a
- a longitudinal sectional view of the air cushion impact mechanism of the invention
Figures 1 and 2 along the line IIIa-IIIa ofFIG. 2 in idling mode; - FIG. 3b
- a longitudinal section of the air cushion impact mechanism according to the invention
Figures 1 and 2 along the line IIIb-IIIb ofFIG. 2 in idling mode; and - FIG. 4
- a longitudinal section of the air cushion impact mechanism according to the invention according to the
FIG. 3a , wherein the air cushion impact mechanism is in the impact position.
In der
Das Luftpolster-Schlagwerk 10 kann sowohl für einen Bohrhammer, d. h. einen angetriebenen Hammer, der auch eine Drehbewegung auf das Werkzeug übertragen kann, als auch bei einem Schlaghammer eingesetzt werden. Der entsprechende motorische Antrieb erfolgt beispielsweise über einen Elektromotor, welcher mit einem Akkumulator oder eine Stromleitung als Stromquelle verbunden sein kann.The air
Das Luftpolster-Schlagwerk 10 umfasst ein Gehäuse 12, in welchem ein axial beweglicher Antriebskolben (nicht dargestellt), ein axial beweglicher Schlagkörper bzw. Schläger 20 sowie ein axial beweglicher Schlagbolzen bzw. Döpper 30 entlang einer Längsachse L des Gehäuses 12 hin- und her bewegbar aufgenommen sind.The air
Das Gehäuse 12 ist hülsenförmig ausgebildet und umfasst zwei Gehäuseteile 14 und 16, die entlang der Längsachse L axial relativ zueinander verschiebbar sind. Hierbei ist in dem ersten Gehäuseteil 14 ein vorderes, d. h. dem Werkzeug zugewandtes Ende des zweiten Gehäuseteils 16 aufgenommen, wie insbesondere in
In dem nachfolgenden Beschreibungstext bezeichnet "vorne" das dem Werkzeug zugewandte Ende des Schlagwerks (in
Der axial innerhalb des zweiten Gehäuseteils 16 bewegliche Antriebskolben (nicht dargestellt) überträgt über ein zwischen dem Antriebskolben und dem Schlagkörper 20 eingeschlossenes, erstes Luftpolster 80 eine Schlagenergie, welche den Schlagkörper 20 in Richtung zu dem Schlagbolzen 30 treibt. Der Antriebskolben wird hierbei beispielsweise über eine Pleuelstange von einer Kurbelwelle angetrieben, die von dem Elektromotor gedreht wird, so dass der Antriebskolben in dem Gehäuse 12 eine axial oszillierende Bewegung ausführt. In gleicher Weise bewegt sich, über das erste Luftpolster 80 angetrieben, der Schlagkörper 20.The axially movable within the
Um ein möglichst leckage-freies Luftpolster bereitzustellen, weist der Schläger 20 eine Dichtnut 22 auf, in der ein Dichtelement, beispielsweise ein elastischer Dichtring 52 (vgl.
Der Schlagkörper 20 treibt seinerseits den Schlagbolzen 30 an. Dabei überträgt die bewegte Schlagmasse des Schlagkörpers 20 beim Aufschlagen auf den Schlagbolzen einen Impuls, den dieser seinerseits auf ein Werkzeug 36 (
Im Ruhezustand liegt der Werkzeughalter 34 mit seiner geneigten Anlagefläche 30a (vgl.
Wie weiter in den
Das zweite Luftpolster 40 dient im Unterschied zu dem ersten Luftpolster 80 zwischen dem Antriebskolben und dem Schlagkörper 20 nicht dazu, einen Antriebsimpuls zu übertragen, sondern stattdessen einen Schlag des Schlagkörpers 20 zu dämpfen und so eine Übertragung von dem Schlagkörper 20 auf den Schlagbolzen 30 im Leerlauf der Maschine zu verhindern. Dies ist insbesondere dann erwünscht, wenn im Leerlauf des Schlagwerks 10 der Schlagkörper 20 bzw. der Antriebskolben nachlaufen. Hier sollen Leerschläge des Schlagwerks 10 verhindert werden, um die daraus resultierende erhebliche Belastungen der Schlagwerksbauteile, wie beispielsweise des Schlagkörpers 20 und Schlagbolzens 30, zu mindern und ein frühzeitiges Versagen des Luftpolster-Schlagwerks 10 zu vermeiden.The
Wie in der
Wird die Arbeit mit dem Bohr- oder Schlaghammer unterbrochen, so bewegt der Antriebskolben den Schlagkörper 20 in einem letzten Leerschlag in Richtung nach vorne, bis der Schlagbolzen 30 mit seiner Anlagefläche 30a an der Schulter 12a der Gehäusehülse 12 zur Anlage gelangt. Dabei überfährt der Schläger 20 mit seiner Dichtung 52 die Entlüftungsöffnungen 50, wodurch das erste Luftpolster 80 ebenfalls nach vorne verlagert wird und über die Entlüftungsöffnungen 50 entlüftet werden kann.If the work with the hammer or percussion hammer interrupted, the drive piston moves the
Die in
Um zu gewährleisten, dass sich die Gehäuseteile 14 und 16 nur axial, nicht jedoch radial zueinander bewegen, sind in dem ersten Gehäuseteil Führungsnuten 14a vorgesehen, in die korrespondierende Führungsstifte 16a des zweiten Gehäuseteils eingreifen. Weiterhin ist zwischen dem Gehäuseteil 14 und 16 eine Rückstellfeder 18 (
In
Claims (8)
dadurch gekennzeichnet, dass die beiden Teile (14, 16) der Gehäusehülse entlang ihrer Längsachse (L) relativ zueinander verschiebbar sind, wobei beide Teile (14, 16) der Gehäusehülse wenigstens eine Entlüftungsbohrung (14b, 16b) aufweisen, die in einer ersten Stellung der Gehäuseteile (14, 16) zueinander wenigstens teilweise miteinander fluchten, um gemeinsam die zweite Entlüftungsöffnung (12b)zu bilden und eine Entlüftung des zweiten Luftpolsters (40) zu ermöglichen, und in einer zweiten Stellung jeweils durch den anderen Teil (14, 16) der Gehäusehülse (12) verschlossen werden, um eine Schlagdämpfung zu ermöglichen.Air-percussion hammer mechanism (10) for a motor-driven drilling or percussion hammer, with a two-part housing sleeve (12), in the at least one drive piston for converting a drive energy into impact energy and at least one impactor (20) and a firing pin (30) for delivering the Impact energy to a tool (36) of the hammer or percussion hammer along a longitudinal axis (L) of the housing sleeve (12) are movably received, wherein a switching device allows switching of the impact mechanism between an idling operation and a percussion operation, wherein in the impact mode between the drive piston and the Impact a first air cushion (80) for transmitting the impact energy of the drive piston can be formed on the striker and in idle mode, a second air cushion (40) for impact damping between the striker (20) and the firing pin (30) can be formed, and wherein the Housing sleeve (12) at least a first Entl ftungsöffnung (50) for venting the first air cushion (80) and at least one second vent hole (12b) for venting said second air cushion (40),
characterized in that the two parts (14, 16) of the housing sleeve along its longitudinal axis (L) are displaceable relative to each other, wherein both parts (14, 16) of the housing sleeve at least one vent hole (14b, 16b), in a first position the housing parts (14, 16) at least partially aligned with each other to jointly form the second vent opening (12b) and to allow venting of the second air cushion (40), and in a second position each closed by the other part (14, 16) of the housing sleeve (12) to allow a shock absorption.
dadurch gekennzeichnet, dass der Antriebskolben und der Schlagkörper jeweils einen Dichtabschnitt aufweisen, der in dichtendem Kontakt mit dem Innenumfang der Gehäusehülse (12) steht, um zwischen sich das Luftpolster (80) innerhalb der Gehäusehülse zu begrenzen.Air cushion impact mechanism (10) according to claim 1,
characterized in that the drive piston and the striker each have a sealing portion which is in sealing contact with the inner periphery of the housing sleeve (12) to define between them the air cushion (80) within the housing sleeve.
dadurch gekennzeichnet, dass die zweiteilige Gehäusehülse (12) eine Führung aufweist, die eine axiale Bewegung der beiden Gehäuseteile (14, 16) relativ zueinander ermöglicht und eine radiale Bewegung der beiden Gehäuseteile (14, 16) relativ zueinander sperrt.Air cushion impact mechanism (10) according to claim 1 or 2,
characterized in that the two-part housing sleeve (12) has a guide which allows an axial movement of the two housing parts (14, 16) relative to each other and a radial movement of the two housing parts (14, 16) blocks relative to each other.
dadurch gekennzeichnet, dass die Führung wenigstens einen Führungsstift (16a) an einem der Gehäuseteile (16) umfasst, der in einer Führungsnut (14a) an dem anderen der Gehäuseteile (14) geführt ist.Air cushion impact mechanism (10) according to claim 3,
characterized in that the guide comprises at least one guide pin (16a) on one of the housing parts (16) which is guided in a guide groove (14a) on the other of the housing parts (14).
dadurch gekennzeichnet, dass die Führungsnut (14a) als Langloch in der Wandung eines der Gehäuseteile (14) ausgebildet ist, in dem der Führungsstift (16a) geführt ist.Air cushion impact mechanism (10) according to claim 4,
characterized in that the guide groove (14a) is formed as a slot in the wall of one of the housing parts (14), in which the guide pin (16a) is guided.
dadurch gekennzeichnet, dass ein elastisches Rückstellelement (18) vorgesehen ist, dass geeignet ist, die beiden Gehäuseteile (14, 16) in einer der beiden Stellungen zu halten oder in eine der beiden Stellungen zurückzustellen.Air cushion impact mechanism (10) according to one of claims 1 to 5,
characterized in that an elastic return element (18) is provided, which is adapted to hold the two housing parts (14, 16) in one of the two positions or to reset in one of the two positions.
dadurch gekennzeichnet, dass das elastische Rückstellelement eine Feder (18) umfasst, die die beiden Gehäuseteile (14, 16) in einer der beiden Stellungen gegeneinander vorspannt.Air cushion impact mechanism (10) according to claim 6,
characterized in that the elastic return element comprises a spring (18) which biases the two housing parts (14, 16) in one of the two positions against each other.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE102011081711A DE102011081711A1 (en) | 2011-08-29 | 2011-08-29 | Air cushion impact mechanism for a motor driven drill or percussion hammer |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2564985A1 true EP2564985A1 (en) | 2013-03-06 |
EP2564985B1 EP2564985B1 (en) | 2017-01-04 |
Family
ID=46934441
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12181795.1A Active EP2564985B1 (en) | 2011-08-29 | 2012-08-24 | Air cushion striking mechanism for a motorised hammer drill or demolition hammer |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2564985B1 (en) |
DE (1) | DE102011081711A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4353416A1 (en) * | 2022-10-12 | 2024-04-17 | Hilti Aktiengesellschaft | Electric power tool |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1969990U (en) | 1967-07-31 | 1967-10-05 | Hilti Ag | CHANGEOVER DEVICE FOR ELECTRO-PNEUMATIC DRILLS. |
DE2641070A1 (en) * | 1976-09-11 | 1978-03-16 | Bosch Gmbh Robert | MOTOR-DRIVEN HAMMER WITH AIR SUSPENSION |
DE3826213A1 (en) | 1988-08-02 | 1990-02-15 | Bosch Gmbh Robert | DRILLING HAMMER |
DE3932134A1 (en) * | 1989-09-27 | 1991-04-04 | Bosch Gmbh Robert | Motor driven hammer - has indirect air cushion striker action which can be adjusted from outside |
US5873418A (en) * | 1996-03-29 | 1999-02-23 | Makita Corporation | Percussive tool having a reduced impact at the start of percussive operation |
DE19810088C1 (en) | 1998-03-10 | 1999-08-26 | Bosch Gmbh Robert | Hammer and boring drill |
EP1464449A2 (en) * | 2003-04-01 | 2004-10-06 | Makita Corporation | Power tool |
DE102006056848A1 (en) | 2006-12-01 | 2008-06-05 | Robert Bosch Gmbh | Pneumatic impact tool for hand operated machine tool, has hammer tube and closing element directly connected with impact pin only as common sliding unit |
WO2008126481A1 (en) * | 2007-03-28 | 2008-10-23 | Makita Corporation | Percussion tool |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009002238A1 (en) * | 2009-04-07 | 2010-10-14 | Robert Bosch Gmbh | Shock controller |
-
2011
- 2011-08-29 DE DE102011081711A patent/DE102011081711A1/en not_active Ceased
-
2012
- 2012-08-24 EP EP12181795.1A patent/EP2564985B1/en active Active
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1969990U (en) | 1967-07-31 | 1967-10-05 | Hilti Ag | CHANGEOVER DEVICE FOR ELECTRO-PNEUMATIC DRILLS. |
DE2641070A1 (en) * | 1976-09-11 | 1978-03-16 | Bosch Gmbh Robert | MOTOR-DRIVEN HAMMER WITH AIR SUSPENSION |
DE3826213A1 (en) | 1988-08-02 | 1990-02-15 | Bosch Gmbh Robert | DRILLING HAMMER |
DE3932134A1 (en) * | 1989-09-27 | 1991-04-04 | Bosch Gmbh Robert | Motor driven hammer - has indirect air cushion striker action which can be adjusted from outside |
US5873418A (en) * | 1996-03-29 | 1999-02-23 | Makita Corporation | Percussive tool having a reduced impact at the start of percussive operation |
DE19810088C1 (en) | 1998-03-10 | 1999-08-26 | Bosch Gmbh Robert | Hammer and boring drill |
EP1464449A2 (en) * | 2003-04-01 | 2004-10-06 | Makita Corporation | Power tool |
DE102006056848A1 (en) | 2006-12-01 | 2008-06-05 | Robert Bosch Gmbh | Pneumatic impact tool for hand operated machine tool, has hammer tube and closing element directly connected with impact pin only as common sliding unit |
WO2008126481A1 (en) * | 2007-03-28 | 2008-10-23 | Makita Corporation | Percussion tool |
Also Published As
Publication number | Publication date |
---|---|
EP2564985B1 (en) | 2017-01-04 |
DE102011081711A1 (en) | 2013-02-28 |
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