EP3411189A1 - Combustion chamber and drive-in device - Google Patents

Combustion chamber and drive-in device

Info

Publication number
EP3411189A1
EP3411189A1 EP17702096.3A EP17702096A EP3411189A1 EP 3411189 A1 EP3411189 A1 EP 3411189A1 EP 17702096 A EP17702096 A EP 17702096A EP 3411189 A1 EP3411189 A1 EP 3411189A1
Authority
EP
European Patent Office
Prior art keywords
combustion chamber
angular position
sealing ring
cylinder axis
chamber wall
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
Application number
EP17702096.3A
Other languages
German (de)
French (fr)
Other versions
EP3411189B1 (en
Inventor
Thomas Sperrfechter
Thorsten Bartz
Peter STAUSS-REINER
David Meier
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Publication of EP3411189A1 publication Critical patent/EP3411189A1/en
Application granted granted Critical
Publication of EP3411189B1 publication Critical patent/EP3411189B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C1/00—Hand-held nailing tools; Nail feeding devices
    • B25C1/08—Hand-held nailing tools; Nail feeding devices operated by combustion pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C1/00—Hand-held nailing tools; Nail feeding devices
    • B25C1/008—Safety devices

Definitions

  • the invention relates to a combustion chamber and a tacker with such a combustion chamber.
  • combustion chambers in particular of driving tools, which comprise a combustion chamber wall in the form of a cylinder axis defining a hollow cylinder, an adjustable inside the hollow cylinder relative to the combustion chamber wall along the cylinder axis and a seal, which in a radial direction relative to the cylinder axis on the one hand to the ground and on the other abuts the combustion chamber wall, for example, to seal a gap between the bottom and the combustion chamber wall.
  • the sealing effect is usually achieved in that the seal consists of a soft sealant, for example of an elastomer.
  • a sealing effect can also be achieved by using a hard sealant, for example a thermoplastic or a thermoset, or else a metal or an alloy, by virtue of the seal being capable of elastic deformation, that is to say of its external shape.
  • the seal comprises a first sealing ring, which extends in the circumferential direction relative to the cylinder axis, with a first interruption. Due to the interruption, the rigidity of the sealing ring is reduced as such, so that the sealing ring as a whole elastically rests, for example, on the combustion chamber wall.
  • the use of a circumferentially extending second sealing ring with respect to the cylinder axis having a second interruption disposed along the circumferential direction opposite the first interruption.
  • the opposing arrangement of the first and the second interruption is determined by means of a fixing device.
  • the use of two sealing rings proves to be disadvantageous if the combustion chamber is stored at temperatures below freezing point of water, so that any existing moisture between the two sealing rings can freeze. The sealing rings then freeze against each other, stiffen each other in their shape, so that a jamming of the soil against the combustion chamber wall is possible.
  • DE 102 26 878 A1 describes a driving tool for driving a nail into a workpiece, in which a combustion chamber is charged with a fuel gas, wherein after a firing operation a driving piston is accelerated against the nail.
  • the combustion chamber has an adjustable combustion chamber floor, wherein an adjusting rod is guided by means of a passage through a housing of the combustion chamber and is connected to the adjustable combustion chamber floor.
  • the combustion chamber bottom is sealed by a circumferential seal against the combustion chamber wall.
  • This object is achieved in a combustion chamber in which the first interruption has a first angular position along the circumferential direction and the second interruption has a second angular position along the circumferential direction, wherein the first angular position and the second angular position enclose an angle which is greater than 0 ° and is less than 180 °.
  • the invention is based on the finding that when the first and second sealing rings are stuck together, it is not necessary to break the ice connecting the two sealing rings over the entire circumference of the sealing rings. Rather, it is sufficient to break the ice over a single peripheral portion between the first and the second interruption, so that the two interruptions are movable relative to each other. The mutual stiffening of the two sealing rings is then essentially already repealed.
  • the combustion chamber wall has the shape of a hollow circular cylinder. Other cylinder shapes may also be advantageous, with the cylinder axis then passing through the center of gravity of the base of the cylinder.
  • the first angular position and the second angular position enclose an angle which is less than 120 °, preferably less than 90 °, particularly preferably less than 60 °. Also advantageously close the first angular position and the second angular position an angle one, which is greater than 30 °.
  • the second sealing ring adjoins the first sealing ring in an axial direction with respect to the cylinder axis.
  • the second sealing ring lies flat against the first sealing ring, particularly preferably over the entire circumference except for the first and the second interruption.
  • the seal has a fixing device for fixing the angle enclosed by the first and the second angular position.
  • the fixing device comprises a projection on the first sealing ring and a recess on the second sealing ring, wherein the projection projects into the recess.
  • the first and / or the second sealing ring consists of a hard sealant.
  • the sealant preferably comprises a particularly preferably fiber-reinforced hard plastic, for example a duroplastic or a thermoplastic, or a metal or an alloy.
  • a particularly preferably fiber-reinforced hard plastic for example a duroplastic or a thermoplastic, or a metal or an alloy.
  • the bottom has a groove extending in the circumferential direction, into which projects the first and / or the second sealing ring.
  • the combustion chamber comprises an elastic support member, which is arranged in the radial direction between the bottom and the seal, preferably in the optional groove, and which pre-loads the first and / or the second sealing ring against the combustion chamber wall.
  • This is preferred Support member material elastic, for example, consisting of an elastomer, or form-elastic, for example, as a spring plate, formed.
  • the support member is preferably formed as a circumferential ring. Also preferably, the support member consists of several individual elastic members.
  • the base is so far adjustable relative to the combustion chamber wall in an axial direction with respect to the cylinder axis that forms an inlet and / or outlet opening of the combustion chamber between the bottom and the combustion chamber wall.
  • the bottom and the combustion chamber wall form an inlet and / or outlet valve of the combustion chamber.
  • the combustion chamber is used in a tacker, which has a driving piston for driving a fastener into a workpiece, wherein in the combustion chamber for driving the driving piston, a blowing agent is combustible.
  • the tacker has a housing and the combustion chamber wall is rigidly connected to the housing.
  • the floor then constitutes a moving part in the tacker.
  • the tacker has a housing and the floor is rigidly connected to the housing.
  • the combustion chamber wall is then in the tacker a moving part.
  • the bottom of the combustion chamber which is adjustable with respect to the combustion chamber wall, generally allows the combustion chamber to be collapsed, for example as part of a safety device, if the device is not properly seated on a workpiece.
  • the combustion chamber is clamped before each setting process by the placement, so that in each case a KochstMail the combustion chamber wall takes place.
  • a recess for discharging water stripped off by the seal is arranged for discharging water at the combustion chamber bottom and / or at the combustion chamber wall. This allows the discharge of condensed water on the combustion chamber wall, so that under certain circumstances less ice is formed between the first and the second sealing ring.
  • Fig. 1 shows an overall view of a tacker with cut open
  • FIG. 2 shows an enlarged detail of the combustion chamber of FIG. 1.
  • Fig. 3 is an exploded view of a gasket for a combustion chamber.
  • a hand-held device comprising a housing 19 and a combustion chamber 1 with a partially cylindrical combustion chamber wall 2, which is rigidly connected to the housing 19. Adjacent to the combustion chamber 1 is a cylinder 3 with a drive piston 4 guided therein.
  • a safety mechanism of the device comprises annensetzhülse 5, which is placed on a workpiece (not shown) and is pressed against the pressure of a spring. Only in this state, a driving operation can be triggered by igniting a blowing agent in the form of a fuel gas in the combustion chamber.
  • a swirl plate 6 is also arranged, which can be moved by the combustion chamber 1 before ignition.
  • a bottom 7 of the combustion chamber 1 is movable along an axis coincident with the driving direction, so that the volume of the combustion chamber is variable.
  • the bottom 7 is sealed for this purpose with a circumferential seal 8 with respect to the cylindrical combustion chamber wall 2.
  • the seal 8 is shown only schematically. A detailed design of the seal 8 according to the invention is shown in detail in FIG. 3.
  • the bottom is rigidly connected to the housing and the combustion chamber wall is formed as an axially movable sleeve.
  • the combustion chamber wall is so far adjustable relative to the ground, so that forms an inlet and / or outlet opening of the combustion chamber for air and / or fuel between the bottom and the combustion chamber wall.
  • the bottom 7 can be moved via an adjusting rod 9 in the direction of the axis, wherein the adjusting rod 9 passes through a passage in a front, second bottom of the combustion chamber.
  • the impressions of the attachment sleeve 5 initially tensions a spring and acts on the adjustment rod 9, which in turn displaces the base 7. As a result, sufficient for an ignition volume of the combustion chamber is only opened.
  • Fig. 3 shows the seal 8 in an exploded view.
  • the seal 8 comprises a circumferentially extending, relative to a cylinder axis 20 of the combustion chamber wall, circular first sealing ring 21 with a first interruption 22 and with respect to the cylinder axis 20 also extending in the circumferential direction, circular second sealing ring 23 with a second interruption 24.
  • the second sealing ring 23 in the direction of the cylinder axis 20 is flat against the first sealing ring 21, preferably over its entire circumference about the cylinder axis 20 circumference, the interruptions 22, 24 except.
  • the first interruption 22 has a first angular position 25, while the second interruption 24 has a second angular position 26.
  • the first angular position 25 and the second angular position 26 enclose an angle ⁇ of 45 °. This angle ⁇ is determined by a fixing device 27.
  • the fixing device 27 comprises a projection, not shown, on the first sealing ring 21, which protrudes into a recess 28 on the second sealing ring and engages, and a projection 29 on the second sealing ring 23, which protrudes into a recess, not shown, on the first sealing ring 21 and engages, so that there is a positive connection between the sealing rings 21, 22 in the circumferential direction, that is, a relative movement between the sealing rings 21, 22 in the circumferential direction is prevented.

Abstract

The invention relates to a combustion chamber with a combustion chamber wall in the shape of a hollow cylinder which defines a cylinder axis, comprising a base which can be moved within the hollow cylinder relative to the combustion chamber wall along the cylinder axis and comprising a seal which lies against the base on one side and against the combustion chamber wall on the other side in a radial direction with respect to the cylinder axis. The seal has a first seal ring, which extends in the circumferential direction relative to the cylinder axis and has a first interruption, and a second seal ring, which extends in the circumferential direction relative to the cylinder axis and has a second interruption. The first interruption has a first angular position along the circumferential direction, and the second interruption has a second angular position along the circumferential direction. The invention is characterized in that the first angular position and the second angular position form an angle.

Description

Brennkammer und Eintreibgerät  Combustion chamber and tacker
Die Erfindung betrifft eine Brennkammer sowie ein Eintreibgerät mit einer solchen Brennkammer. The invention relates to a combustion chamber and a tacker with such a combustion chamber.
Es sind Brennkammern insbesondere von Eintreibgeräten bekannt, welche eine Brennkammerwand in Form eines eine Zylinderachse definierenden Hohlzylinders, einen innerhalb des Hohlzylinders gegenüber der Brennkammerwand entlang der Zylinderachse verstellbaren Boden und eine Dichtung umfassen, welche in einer bezüglich der Zylinderachse radialen Richtung einerseits an dem Boden und andererseits an der Brennkammerwand anliegt, beispielsweise um einen Spalt zwischen dem Boden und der Brennkammerwand abzudichten. Die Dichtwirkung wird üblicherweise dadurch erzielt, dass die Dichtung aus einem weichen Dichtstoff, beispielsweise aus einem Elastomer, besteht. There are known combustion chambers, in particular of driving tools, which comprise a combustion chamber wall in the form of a cylinder axis defining a hollow cylinder, an adjustable inside the hollow cylinder relative to the combustion chamber wall along the cylinder axis and a seal, which in a radial direction relative to the cylinder axis on the one hand to the ground and on the other abuts the combustion chamber wall, for example, to seal a gap between the bottom and the combustion chamber wall. The sealing effect is usually achieved in that the seal consists of a soft sealant, for example of an elastomer.
Eine Dichtwirkung ist auch bei Verwendung eines harten Dichtstoffs, beispielsweise eines Thermoplasts oder eines Duroplasts, oder auch eines Metalls oder einer Legierung, herbeiführbar, indem die Dichtung formelastisch, das heisst aufgrund ihrer äusseren Form beweglich ist. Beispielsweise umfasst die Dichtung einen sich bezüglich der Zylinderachse in Umfangsrichtung erstreckenden ersten Dichtring mit einer ersten Unterbrechung. Aufgrund der Unterbrechung wird die Steifigkeit des Dichtrings als solchem reduziert, so dass der Dichtring insgesamt elastisch zum Beispiel an der Brennkammerwand anliegt. Um eine mit der Unterbrechung verbundene Leckage zu minimieren, ist die Verwendung eines sich bezüglich der Zylinderachse in Umfangsrichtung erstreckenden zweiten Dichtrings mit einer zweiten Unterbrechung bekannt, welche entlang der Umfangsrichtung gegenüber der ersten Unterbrechung angeordnet ist. Die einander gegenüberliegende Anordnung der ersten und der zweiten Unterbrechung wird mittels einer Fixiervorrichtung festgelegt. Die Verwendung zweier Dichtringe erweist sich jedoch dann als nachteilig, wenn die Brennkammer bei Temperaturen unter dem Gefrierpunkt von Wasser gelagert wird, so dass gegebenenfalls vorhandene Feuchtigkeit zwischen den beiden Dichtringen einfrieren kann. Die Dichtringe frieren dann aneinander fest, versteifen sich gegenseitig in ihrer Form, so dass ein Verklemmen des Bodens gegenüber der Brennkammerwand möglich ist. Das Eis, das die beiden Dichtringe miteinander verbindet, muss dann für eine Verwendung der Brennkammer nach einer solchen Lagerung erst aufgebrochen werden, was ohne vorheriges Erwärmen nicht oder nur mit sehr hohem Kraftaufwand möglich ist. Die DE 102 26 878 A1 beschreibt ein Eintreibgerät zum Eintreiben eines Nagels in ein Werkstück, bei dem eine Brennkammer mit einem Brenngas beschickt wird, wobei nach einem Zündvorgang ein Eintreibkolben gegen den Nagel beschleunigt wird. Die Brennkammer hat einen verstellbaren Brennkammerboden, wobei eine Stellstange mittels einer Durchführung durch ein Gehäuse der Brennkammer geführt ist und mit dem verstellbaren Brennkammerboden verbunden ist. Der Brennkammerboden ist durch eine umlaufende Dichtung gegen die Brennkammerwand abgedichtet. A sealing effect can also be achieved by using a hard sealant, for example a thermoplastic or a thermoset, or else a metal or an alloy, by virtue of the seal being capable of elastic deformation, that is to say of its external shape. By way of example, the seal comprises a first sealing ring, which extends in the circumferential direction relative to the cylinder axis, with a first interruption. Due to the interruption, the rigidity of the sealing ring is reduced as such, so that the sealing ring as a whole elastically rests, for example, on the combustion chamber wall. In order to minimize leakage associated with the interruption, the use of a circumferentially extending second sealing ring with respect to the cylinder axis is known having a second interruption disposed along the circumferential direction opposite the first interruption. The opposing arrangement of the first and the second interruption is determined by means of a fixing device. However, the use of two sealing rings proves to be disadvantageous if the combustion chamber is stored at temperatures below freezing point of water, so that any existing moisture between the two sealing rings can freeze. The sealing rings then freeze against each other, stiffen each other in their shape, so that a jamming of the soil against the combustion chamber wall is possible. The ice, which connects the two sealing rings together, must then be broken for use of the combustion chamber after such storage only, which is not possible without prior heating or only with great effort. DE 102 26 878 A1 describes a driving tool for driving a nail into a workpiece, in which a combustion chamber is charged with a fuel gas, wherein after a firing operation a driving piston is accelerated against the nail. The combustion chamber has an adjustable combustion chamber floor, wherein an adjusting rod is guided by means of a passage through a housing of the combustion chamber and is connected to the adjustable combustion chamber floor. The combustion chamber bottom is sealed by a circumferential seal against the combustion chamber wall.
Es ist die Aufgabe der Erfindung, eine Brennkammer sowie ein Eintreibgerät anzugeben, die einen zuverlässigen Betrieb insbesondere auch bei niedrigen Umgebungstemperaturen ermöglichen. It is the object of the invention to provide a combustion chamber and a tacker that allow reliable operation, especially at low ambient temperatures.
Diese Aufgabe ist gelöst bei einer Brennkammer, bei der die erste Unterbrechung eine erste Winkelposition entlang der Umfangsrichtung aufweist und die zweite Unterbrechung eine zweite Winkelposition entlang der Umfangsrichtung aufweist, wobei die erste Winkelposition und die zweite Winkelposition einen Winkel einschliessen, welcher grösser als 0° und kleiner als 180° ist. Der Erfindung liegt die Erkenntnis zugrunde, dass es bei einem Festfrieren des ersten und des zweiten Dichtrings aneinander nicht notwendig ist, das die beiden Dichtringe verbindende Eis über den gesamten Umfang der Dichtringe aufzubrechen. Vielmehr reicht es aus, das Eis über einen einzigen Umfangsabschnitt zwischen der ersten und der zweiten Unterbrechung aufzubrechen, so dass die beiden Unterbrechungen gegenüber einander beweglich sind. Die gegenseitige Versteifung der beiden Dichtringe ist dann im Wesentlichen bereits aufgehoben. Die Verkürzung eines einzigen Umfangsabschnitts zwischen den beiden Unterbrechungen reicht aus, um eine Schwachstelle in der unerwünschten Vereisung zwischen den beiden Dichtringen sicherzustellen, so dass ein Aufbrechen des Eises erleichtert oder ermöglicht wird. Bei einer vorteilhaften Ausführungsform hat die Brennkammerwand die Form eines hohlen Kreiszylinders. Andere Zylinderformen sind unter Umständen ebenfalls vorteilhaft, wobei die Zylinderachse dann durch den Schwerpunkt der Grundfläche des Zylinders verläuft. This object is achieved in a combustion chamber in which the first interruption has a first angular position along the circumferential direction and the second interruption has a second angular position along the circumferential direction, wherein the first angular position and the second angular position enclose an angle which is greater than 0 ° and is less than 180 °. The invention is based on the finding that when the first and second sealing rings are stuck together, it is not necessary to break the ice connecting the two sealing rings over the entire circumference of the sealing rings. Rather, it is sufficient to break the ice over a single peripheral portion between the first and the second interruption, so that the two interruptions are movable relative to each other. The mutual stiffening of the two sealing rings is then essentially already repealed. The shortening of a single circumferential portion between the two interruptions is sufficient to ensure a weak spot in the unwanted icing between the two sealing rings, so that a break-up of the ice is facilitated or enabled. In an advantageous embodiment, the combustion chamber wall has the shape of a hollow circular cylinder. Other cylinder shapes may also be advantageous, with the cylinder axis then passing through the center of gravity of the base of the cylinder.
Bei einer vorteilhaften Ausführungsform schliessen die erste Winkelposition und die zweite Winkelposition einen Winkel ein, welcher kleiner als 120°, bevorzugt kleiner als 90°, besonders bevorzugt kleiner als 60° ist. Ebenfalls vorteilhaft schliessen die erste Winkelposition und die zweite Winkelposition einen Winkel eins, welcher grösser als 30° ist. In an advantageous embodiment, the first angular position and the second angular position enclose an angle which is less than 120 °, preferably less than 90 °, particularly preferably less than 60 °. Also advantageously close the first angular position and the second angular position an angle one, which is greater than 30 °.
Bei einer vorteilhaften Ausführungsform schliesst sich der zweite Dichtring in einer bezüglich der Zylinderachse axialen Richtung an den ersten Dichtring an. Bevorzugt liegt der zweite Dichtring flächig an dem ersten Dichtring an, besonders bevorzugt über den gesamten Umfang bis auf die erste und die zweite Unterbrechung. In an advantageous embodiment, the second sealing ring adjoins the first sealing ring in an axial direction with respect to the cylinder axis. Preferably, the second sealing ring lies flat against the first sealing ring, particularly preferably over the entire circumference except for the first and the second interruption.
Bei einer vorteilhaften Ausführungsform weist die Dichtung eine Fixiervorrichtung zur Festlegung des von der ersten und der zweiten Winkelposition eingeschlossenen Winkels auf. Bevorzugt umfasst die Fixiervorrichtung einen Vorsprung an dem ersten Dichtring und eine Aussparung an dem zweiten Dichtring, wobei der Vorsprung in die Aussparung hineinragt. In an advantageous embodiment, the seal has a fixing device for fixing the angle enclosed by the first and the second angular position. Preferably, the fixing device comprises a projection on the first sealing ring and a recess on the second sealing ring, wherein the projection projects into the recess.
Bei einer vorteilhaften Ausführungsform besteht der erste und/oder der zweite Dichtring aus einem harten Dichtstoff. Bevorzugt umfasst der Dichtstoff einen besonders bevorzugt faserverstärkten Hartkunststoff, beispielsweise ein Duroplast oder ein Thermoplast, oder ein Metall oder eine Legierung. Hiervon abzugrenzen sind weiche Dichtmaterialien wie etwa Elastomere oder Gummi oder Silikon, die bei Verwendung als Dichtung wegen ihrer Materialelastizität in sich deformiert werden, um eine ausreichende Dichtwirkung zu erzielen. In an advantageous embodiment, the first and / or the second sealing ring consists of a hard sealant. The sealant preferably comprises a particularly preferably fiber-reinforced hard plastic, for example a duroplastic or a thermoplastic, or a metal or an alloy. To delineate from soft sealing materials such as elastomers or rubber or silicone, which are deformed when used as a seal because of their material elasticity in itself to achieve a sufficient sealing effect.
Bei einer vorteilhaften Ausführungsform weist der Boden eine in der Umfangsrichtung verlaufende Nut auf, in welche der erste und/oder der zweite Dichtring hineinragt. In an advantageous embodiment, the bottom has a groove extending in the circumferential direction, into which projects the first and / or the second sealing ring.
Bei einer vorteilhaften Ausführungsform umfasst die Brennkammer ein elastisches Stützglied, welches in der radialen Richtung zwischen dem Boden und der Dichtung, bevorzugt in der gegebenenfalls vorhandenen Nut, angeordnet ist und welches den ersten und/oder den zweiten Dichtring gegen die Brennkammerwand vorbelastet. Bevorzugt ist das Stützglied materialelastisch, beispielsweise aus einem Elastomer bestehend, oder formelastisch, beispielsweise als Federblech, ausgebildet. Das Stützglied ist bevorzugt als umlaufender Ring ausgebildet. Ebenfalls bevorzugt besteht das Stützglied aus mehreren einzelnen elastischen Gliedern. In an advantageous embodiment, the combustion chamber comprises an elastic support member, which is arranged in the radial direction between the bottom and the seal, preferably in the optional groove, and which pre-loads the first and / or the second sealing ring against the combustion chamber wall. This is preferred Support member material elastic, for example, consisting of an elastomer, or form-elastic, for example, as a spring plate, formed. The support member is preferably formed as a circumferential ring. Also preferably, the support member consists of several individual elastic members.
Bei einer vorteilhaften Ausführungsform ist der Boden gegenüber der Brennkammerwand in einer bezüglich der Zylinderachse axialen Richtung so weit verstellbar, dass sich zwischen dem Boden und der Brennkammerwand eine Ein- und/oder Auslassöffnung der Brennkammer bildet. Besonders bevorzugt bilden der Boden und die Brennkammerwand ein Ein- und/oder Auslassventil der Brennkammer. In an advantageous embodiment, the base is so far adjustable relative to the combustion chamber wall in an axial direction with respect to the cylinder axis that forms an inlet and / or outlet opening of the combustion chamber between the bottom and the combustion chamber wall. Particularly preferably, the bottom and the combustion chamber wall form an inlet and / or outlet valve of the combustion chamber.
Bei einer vorteilhaften Ausführungsform ist die Brennkamme in einem Eintreibgerät eingesetzt, welches eines Eintreibkolben zum Eintreiben eines Befestigungselements in ein Werkstück aufweist, wobei in der Brennkammer zum Antreiben des Eintreibkolbens ein Treibmittel verbrennbar ist. In an advantageous embodiment, the combustion chamber is used in a tacker, which has a driving piston for driving a fastener into a workpiece, wherein in the combustion chamber for driving the driving piston, a blowing agent is combustible.
Bei einer vorteilhaften Ausführungsform weist das Eintreibgerät ein Gehäuse auf und die Brennkammerwand ist starr mit dem Gehäuse verbunden. Der Boden stellt dann in dem Eintreibgerät ein bewegtes Teil dar. Bei einer weiteren vorteilhaften Ausführungsform weist das Eintreibgerät ein Gehäuse auf und der Boden ist starr mit dem Gehäuse verbunden. Die Brennkammerwand stellt dann in dem Eintreibgerät ein bewegtes Teil dar. In an advantageous embodiment, the tacker has a housing and the combustion chamber wall is rigidly connected to the housing. The floor then constitutes a moving part in the tacker. In a further advantageous embodiment, the tacker has a housing and the floor is rigidly connected to the housing. The combustion chamber wall is then in the tacker a moving part.
Der gegenüber der Brennkammerwand verstellbare Boden der Brennkammer erlaubt es allgemein, dass die Brennkammer zum Beispiel als Teil einer Sicherheitseinrichtung kollabiert werden kann, wenn das Gerät nicht ordnungsgemäß auf ein Werkstück aufgesetzt ist. Bei solchen Geräten wird die Brennkammer vor jedem Setzvorgang durch das Aufsetzen aufgespannt, so dass jeweils ein Überstreifen der Brennkammerwand erfolgt. The bottom of the combustion chamber, which is adjustable with respect to the combustion chamber wall, generally allows the combustion chamber to be collapsed, for example as part of a safety device, if the device is not properly seated on a workpiece. In such devices, the combustion chamber is clamped before each setting process by the placement, so that in each case a Überstreifen the combustion chamber wall takes place.
Bei einer vorteilhaften Ausführungsform ist zur Ableitung von Wassers an dem Brennkammerboden und/oder an der Brennkammerwand eine Ausnehmung zur Abführung von durch die Dichtung abgestreiftem Wasser angeordnet. Dies erlaubt das Ableiten von an der Brennkammerwand kondensiertem Wasser, so dass sich unter Umständen weniger Eis zwischen dem ersten und dem zweiten Dichtring bildet. Weitere Vorteile und Merkmale der Erfindung ergeben sich aus den nachfolgend beschriebenen Ausführungsbeispielen sowie aus den abhängigen Ansprüchen. In an advantageous embodiment, a recess for discharging water stripped off by the seal is arranged for discharging water at the combustion chamber bottom and / or at the combustion chamber wall. This allows the discharge of condensed water on the combustion chamber wall, so that under certain circumstances less ice is formed between the first and the second sealing ring. Further advantages and features of the invention will become apparent from the embodiments described below and from the dependent claims.
Nachfolgend wird ein bevorzugtes Ausführungsbeispiel der Erfindung beschrieben und anhand der anliegenden Zeichnungen näher erläutert. Hereinafter, a preferred embodiment of the invention will be described and explained in more detail with reference to the accompanying drawings.
Fig. 1 zeigt eine räumliche Gesamtansicht eines Eintreibgerätes mit aufgeschnittener Fig. 1 shows an overall view of a tacker with cut open
Brennkammer.  Combustion chamber.
Fig. 2 zeigt eine Ausschnittsvergrößerung der Brennkammer aus Fig. 1 .  FIG. 2 shows an enlarged detail of the combustion chamber of FIG. 1. FIG.
Fig. 3 ist eine Explosionszeichnung einer Dichtung für eine Brennkammer. Fig. 3 is an exploded view of a gasket for a combustion chamber.
Das Eintreibgerät aus Fig. 1 ist ein handgeführtes Gerät, umfassend ein Gehäuse 19 sowie eine Brennkammer 1 mit einer abschnittsweise zylindrischen Brennkammerwand 2, welche starr mit dem Gehäuse 19 verbunden ist. An die Brennkammer 1 grenzt ein Zylinder 3 mit einem darin geführten Eintreibkolben 4 an. Eine Sicherheitsmechanik des Gerätes umfasst eine Aufsetzhülse 5, die auf ein Werkstück (nicht dargestellt) aufgesetzt wird und gegen den Druck einer Feder eingedrückt wird. Nur in diesem Zustand kann ein Eintreibvorgang durch Zünden eines Treibmittels in Form eines Brenngases in der Brennkammer ausgelöst werden. In der Brennkammer 1 ist zudem eine Wirbelplatte 6 angeordnet, die vor einer Zündung durch die Brennkammer 1 bewegt werden kann. 1 is a hand-held device, comprising a housing 19 and a combustion chamber 1 with a partially cylindrical combustion chamber wall 2, which is rigidly connected to the housing 19. Adjacent to the combustion chamber 1 is a cylinder 3 with a drive piston 4 guided therein. A safety mechanism of the device comprises a Aufsetzhülse 5, which is placed on a workpiece (not shown) and is pressed against the pressure of a spring. Only in this state, a driving operation can be triggered by igniting a blowing agent in the form of a fuel gas in the combustion chamber. In the combustion chamber 1, a swirl plate 6 is also arranged, which can be moved by the combustion chamber 1 before ignition.
Ein Boden 7 der Brennkammer 1 ist entlang einer mit der Eintreibrichtung zusammenfallenden Achse bewegbar, so dass das Volumen der Brennkammer veränderlich ist. Der Boden 7 ist hierzu mit einer umlaufenden Dichtung 8 gegenüber der zylindrischen Brennkammerwand 2 abgedichtet. In den Fig. 1 und 2 ist die Dichtung 8 nur schematisch dargestellt. Eine erfindungsgemäße Detailgestaltung der Dichtung 8 ist in Fig. 3 detailliert gezeigt. A bottom 7 of the combustion chamber 1 is movable along an axis coincident with the driving direction, so that the volume of the combustion chamber is variable. The bottom 7 is sealed for this purpose with a circumferential seal 8 with respect to the cylindrical combustion chamber wall 2. In Figs. 1 and 2, the seal 8 is shown only schematically. A detailed design of the seal 8 according to the invention is shown in detail in FIG. 3.
Bei nicht gezeigten Ausführungsbeispielen ist der Boden starr mit dem Gehäuse verbunden und die Brennkammerwand ist als axial bewegbare Hülse ausgebildet. Bei ebenfalls nicht dargestellten Ausführungsbeispielen ist die Brennkammerwand gegenüber dem Boden so weit verstellbar, so dass sich zwischen dem Boden und der Brennkammerwand eine Ein- und/oder Auslassöffnung der Brennkammer für Luft und/oder Brennstoff bildet. Der Boden 7 kann über eine Stellstange 9 in Richtung der Achse bewegt werden, wobei die Stellstange 9 eine Durchführung in einem vorderen, zweiten Boden der Brennkammer durchgreift. Das Eindrücken der Aufsetzhülse 5 spannt zunächst eine Feder und wirkt auf die Stellstange 9, welche wiederum den Boden 7 verschiebt. Hierdurch wird ein für eine Zündung ausreichendes Volumen der Brennkammer erst aufspannt. Bei dieser Bewegung des Bodens entlang der Brennkammerwand wird regelmäßig kondensiertes Wasser abgestreift. Zur Vermeidung von Schwergängigkeit des Mechanismus sollte möglichst wenig Wasser in den Bereich der Dichtung 8 eindringen und gefrieren. Fig. 3 zeigt die Dichtung 8 in einer Explosionsdarstellung. Die Dichtung 8 umfasst einen sich bezüglich einer Zylinderachse 20 der nicht gezeigten Brennkammerwand in Umfangsrichtung erstreckenden, kreisförmigen ersten Dichtring 21 mit einer ersten Unterbrechung 22 sowie einen sich bezüglich der Zylinderachse 20 ebenfalls in Umfangsrichtung erstreckenden, kreisförmigen zweiten Dichtring 23 mit einer zweiten Unterbrechung 24. Im zusammengebauten Zustand der nicht weiter dargestellten Brennkammer liegt der zweite Dichtring 23 in Richtung der Zylinderachse 20 flächig an dem ersten Dichtring 21 an, bevorzugt über seinen gesamten um die Zylinderachse 20 laufenden Umfang, die Unterbrechungen 22, 24 ausgenommen. Entlang der Umfangsrichtung weist die erste Unterbrechung 22 eine erste Winkelposition 25 auf, während die zweite Unterbrechung 24 eine zweite Winkelposition 26 aufweist. Die erste Winkelposition 25 und die zweite Winkelposition 26 schliessen einen Winkel α von 45° ein. Dieser Winkel α wird durch eine Fixiervorrichtung 27 festgelegt. Die Fixiervorrichtung 27 umfasst einen nicht dargestellten Vorsprung an dem ersten Dichtring 21 , welcher in eine Aussparung 28 an dem zweiten Dichtring hineinragt und eingreift, sowie einen Vorsprung 29 an dem zweiten Dichtring 23, welcher in eine nicht dargestellte Aussparung an dem ersten Dichtring 21 hineinragt und eingreift, so dass sich zwischen den Dichtringen 21 , 22 in der umlaufenden Richtung ein Formschluss ergibt, das heisst eine Relativbewegung zwischen den Dichtringen 21 , 22 in der umlaufenden Richtung wird verhindert. In embodiments not shown, the bottom is rigidly connected to the housing and the combustion chamber wall is formed as an axially movable sleeve. In embodiments also not shown, the combustion chamber wall is so far adjustable relative to the ground, so that forms an inlet and / or outlet opening of the combustion chamber for air and / or fuel between the bottom and the combustion chamber wall. The bottom 7 can be moved via an adjusting rod 9 in the direction of the axis, wherein the adjusting rod 9 passes through a passage in a front, second bottom of the combustion chamber. The impressions of the attachment sleeve 5 initially tensions a spring and acts on the adjustment rod 9, which in turn displaces the base 7. As a result, sufficient for an ignition volume of the combustion chamber is only opened. During this movement of the soil along the combustion chamber wall condensed water is regularly stripped off. To avoid binding of the mechanism, as little water as possible should penetrate into the region of the seal 8 and freeze. Fig. 3 shows the seal 8 in an exploded view. The seal 8 comprises a circumferentially extending, relative to a cylinder axis 20 of the combustion chamber wall, circular first sealing ring 21 with a first interruption 22 and with respect to the cylinder axis 20 also extending in the circumferential direction, circular second sealing ring 23 with a second interruption 24. Im assembled state of the combustion chamber, not shown, the second sealing ring 23 in the direction of the cylinder axis 20 is flat against the first sealing ring 21, preferably over its entire circumference about the cylinder axis 20 circumference, the interruptions 22, 24 except. Along the circumferential direction, the first interruption 22 has a first angular position 25, while the second interruption 24 has a second angular position 26. The first angular position 25 and the second angular position 26 enclose an angle α of 45 °. This angle α is determined by a fixing device 27. The fixing device 27 comprises a projection, not shown, on the first sealing ring 21, which protrudes into a recess 28 on the second sealing ring and engages, and a projection 29 on the second sealing ring 23, which protrudes into a recess, not shown, on the first sealing ring 21 and engages, so that there is a positive connection between the sealing rings 21, 22 in the circumferential direction, that is, a relative movement between the sealing rings 21, 22 in the circumferential direction is prevented.

Claims

PATENTANSPRUECHE cLAIMS
1 . Brennkammer mit einer Brennkammerwand in Form eines eine Zylinderachse definierenden Hohlzylinders, mit einem innerhalb des Hohlzylinders gegenüber der Brennkammerwand entlang der Zylinderachse verstellbaren Boden und mit einer1 . Combustion chamber with a combustion chamber wall in the form of a hollow cylinder defining a cylinder axis, with a bottom adjustable within the hollow cylinder with respect to the combustion chamber wall along the cylinder axis and with a
Dichtung, welche in einer bezüglich der Zylinderachse radialen Richtung einerseits an dem Boden und andererseits an der Brennkammerwand anliegt, wobei die Dichtung einen sich bezüglich der Zylinderachse in Umfangsrichtung erstreckenden ersten Dichtring mit einer ersten Unterbrechung und einen sich bezüglich der Zylinderachse in Umfangsrichtung erstreckenden zweiten Dichtring mit einer zweiten Unterbrechung umfasst, wobei die erste Unterbrechung eine erste Winkelposition entlang der Umfangsrichtung aufweist und die zweite Unterbrechung eine zweite Winkelposition entlang der Umfangsrichtung aufweist, dadurch gekennzeichnet, dass die erste Winkelposition und die zweite Winkelposition einen Winkel einschliessen, welcher grösser als 0° und kleiner als 180° ist. A gasket, which bears in a radial direction with respect to the cylinder axis on the one hand on the ground and on the other hand, on the combustion chamber wall, wherein the seal with respect to the cylinder axis in the circumferential direction extending first sealing ring with a first interruption and with respect to the cylinder axis in the circumferential direction extending second sealing ring a second interruption, wherein the first interruption has a first angular position along the circumferential direction and the second interruption has a second angular position along the circumferential direction, characterized in that the first angular position and the second angular position enclose an angle which is greater than 0 ° and smaller than 180 °.
2. Brennkammer nach Anspruch 1 , dadurch gekennzeichnet, dass die erste Winkelposition und die zweite Winkelposition einen Winkel einschliessen, welcher kleiner als 120°, bevorzugt kleiner als 90°, besonders bevorzugt kleiner als 60° ist. 2. Combustion chamber according to claim 1, characterized in that the first angular position and the second angular position enclose an angle which is less than 120 °, preferably less than 90 °, more preferably less than 60 °.
3. Brennkammer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die erste Winkelposition und die zweite Winkelposition einen Winkel einschliessen, welcher grösser als 30° ist. 3. Combustion chamber according to one of the preceding claims, characterized in that the first angular position and the second angular position enclose an angle which is greater than 30 °.
4. Brennkammer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sich der zweite Dichtring in einer bezüglich der Zylinderachse axialen Richtung an den ersten Dichtring anschliesst. 4. combustion chamber according to one of the preceding claims, characterized in that adjoins the second sealing ring in an axial direction with respect to the cylinder axis of the first sealing ring.
5. Brennkammer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Dichtung eine Fixiervorrichtung zur Festlegung des von der ersten und der zweiten Winkelposition eingeschlossenen Winkels aufweist. 5. combustion chamber according to one of the preceding claims, characterized in that the seal has a fixing device for fixing the enclosed by the first and the second angular position angle.
6. Brennkammer nach Anspruch 5, dadurch gekennzeichnet, dass die Fixiervorrichtung einen Vorsprung an dem ersten Dichtring und eine Aussparung an dem zweiten Dichtring umfasst, wobei der Vorsprung in die Aussparung hineinragt. Brennkammer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der erste und/oder der zweite Dichtring aus einem harten Dichtstoff besteht. 6. Combustion chamber according to claim 5, characterized in that the fixing device comprises a projection on the first sealing ring and a recess on the second sealing ring, wherein the projection projects into the recess. Combustion chamber according to one of the preceding claims, characterized in that the first and / or the second sealing ring consists of a hard sealant.
Brennkammer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Boden eine in der Umfangsrichtung verlaufende Nut aufweist, in welche der erste und/oder der zweite Dichtring hineinragt. Combustion chamber according to one of the preceding claims, characterized in that the bottom has a groove extending in the circumferential direction, into which projects the first and / or the second sealing ring.
Brennkammer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Brennkammer ein elastisches Stützglied umfasst, welches in der radialen Richtung zwischen dem Boden und der Dichtung angeordnet ist und welches den ersten und/oder den zweiten Dichtring gegen die Brennkammerwand vorbelastet. Combustion chamber according to one of the preceding claims, characterized in that the combustion chamber comprises an elastic support member which is arranged in the radial direction between the bottom and the seal and which biases the first and / or the second sealing ring against the combustion chamber wall.
Brennkammer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Boden gegenüber der Brennkammerwand in einer bezüglich der Zylinderachse axialen Richtung so weit verstellbar ist, dass sich zwischen dem Boden und der Brennkammerwand eine Ein- und/oder Auslassöffnung der Brennkammer bildet. Combustion chamber according to one of the preceding claims, characterized in that the bottom relative to the combustion chamber wall in an axial direction relative to the cylinder axis is so far adjustable that forms an inlet and / or outlet opening of the combustion chamber between the bottom and the combustion chamber wall.
Eintreibgerät, mit einem Eintreibkolben zum Eintreiben eines Befestigungselements in ein Werkstück, mit einer Brennkammer, in welcher zum Antreiben des Eintreibkolbens ein Treibmittel verbrennbar ist, dadurch gekennzeichnet, dass die Brennkammer nach einem der vorhergehenden Ansprüche ausgebildet ist. A tacker having a driving piston for driving a fastener into a workpiece, having a combustion chamber in which a propellant is combustible for driving the driving piston, characterized in that the combustion chamber is formed according to one of the preceding claims.
Eintreibgerät nach Anspruch 1 1 , dadurch gekennzeichnet, dass das Eintreibgerät ein Gehäuse aufweist und die Brennkammerwand starr mit dem Gehäuse verbunden ist. A tacker according to claim 1 1, characterized in that the tacker has a housing and the combustion chamber wall is rigidly connected to the housing.
Eintreibgerät nach Anspruch 1 1 , dadurch gekennzeichnet, dass das Eintreibgerät Gehäuse aufweist und der Boden starr mit dem Gehäuse verbunden ist. A tacker according to claim 1 1, characterized in that the tacker has housing and the bottom is rigidly connected to the housing.
EP17702096.3A 2016-02-01 2017-01-31 Combustion chamber and driving tool Active EP3411189B1 (en)

Applications Claiming Priority (2)

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EP16153619.8A EP3199301A1 (en) 2016-02-01 2016-02-01 Combustion chamber and driving tool
PCT/EP2017/051964 WO2017134021A1 (en) 2016-02-01 2017-01-31 Combustion chamber and drive-in device

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EP3411189B1 EP3411189B1 (en) 2020-04-22

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JP (1) JP2019505401A (en)
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EP3034239A1 (en) * 2014-12-19 2016-06-22 HILTI Aktiengesellschaft Driving device with adjustable combustion chamber

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US20190047129A1 (en) 2019-02-14
CN108602178A (en) 2018-09-28
EP3199301A1 (en) 2017-08-02
EP3411189B1 (en) 2020-04-22
JP2019505401A (en) 2019-02-28

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