WO2005110684A1 - Outil de travail de type à combustion - Google Patents

Outil de travail de type à combustion Download PDF

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Publication number
WO2005110684A1
WO2005110684A1 PCT/JP2005/008644 JP2005008644W WO2005110684A1 WO 2005110684 A1 WO2005110684 A1 WO 2005110684A1 JP 2005008644 W JP2005008644 W JP 2005008644W WO 2005110684 A1 WO2005110684 A1 WO 2005110684A1
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WO
WIPO (PCT)
Prior art keywords
combustion chamber
combustion
ignition
volume
chamber
Prior art date
Application number
PCT/JP2005/008644
Other languages
English (en)
Japanese (ja)
Inventor
Isao Miyashita
Original Assignee
Makita Corporation
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
Priority claimed from JP2004146895A external-priority patent/JP4584623B2/ja
Priority claimed from JP2004178963A external-priority patent/JP4485263B2/ja
Application filed by Makita Corporation filed Critical Makita Corporation
Publication of WO2005110684A1 publication Critical patent/WO2005110684A1/fr

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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

Definitions

  • the present invention relates to a power tool for performing a predetermined machining operation by using a high pressure (impact force) when combustible gas is burned, that is, a combustion chamber ignition and exhaust technology in a combustion type power tool. .
  • Japanese Patent Application Laid-Open No. 2001-162561 discloses a specific example of a so-called combustion type power tool using a piston-cylinder internal combustion engine as a drive source of a power tool such as a nailing machine or a torsion force. It is disclosed in reference 1).
  • An object of the present invention is to provide a technique that contributes to realizing rationalization of an ignition mechanism and rationalization of exhaust gas emission in a combustion chamber in a combustion type power tool.
  • a movable member movable so as to change the volume of the combustion chamber, a guide cylinder connected to the combustion chamber, a piston member slidably housed in the guide cylinder,
  • the movable member moves in the direction of decreasing the volume of the combustion chamber, the volume is increased, and when the movable member moves in the direction of increasing the volume of the combustion chamber, the volume is decreased.
  • the exhaust gas in the combustion chamber is discharged to the atmosphere chamber while discharging the exhaust gas to the outside.
  • Air is sucked in from outside, and movable members increase the volume of the combustion chamber and decrease the volume of the atmosphere chamber When moving in the direction, the air in the atmosphere chamber is compressed and pushed into the combustion chamber, and the exhaust gas remaining in the combustion chamber is discharged outside the chamber.
  • the exhaust gas in the combustion chamber can be discharged in two stages, that is, when the volume of the combustion chamber is reduced and when it is increased. It is possible to reduce the residual amount of the fuel as much as possible, and it is possible to enhance the cleaning effect in the combustion chamber. Also, since it is not necessary to reduce the volume of the combustion chamber to zero or close to zero, for example, when the combustion chambers are configured with a plurality of combustion chambers that communicate with each other, the exhaust gas does not matter regardless of the shape of the combustion chambers. Gas can be discharged rationally outside the room.
  • a combustion chamber a combustion chamber wall constituting the combustion chamber, an ignition section having an ignition region facing the combustion chamber, and a power supply section for supplying electric power to the ignition section
  • a cylinder connected to the combustion chamber, a piston member slidably accommodated in the cylinder, and electrically connected to the power supply unit and spaced apart from the ignition unit.
  • a combustion-type power tool having an energization control unit is configured. When the combustion chamber wall is moved to the combustible position, the energization control section contacts the ignition section with the movement of the combustion chamber wall to allow the power supply section power to energize the ignition section and perform combustion. When the chamber wall is moved to a position other than the combustible position, the power supply unit power is regulated by separating the ignition unit power.
  • the power supply control unit is provided between the power supply unit and the ignition unit, and the ignition control unit is configured to allow the ignition in a state of being in contact with the ignition unit. This can simplify the structure of the power tool that does not need to be communicated, and also ensures that the ignition timing is controlled properly.
  • FIGS. 1 to 5 The overall configuration of a nailing machine 101 according to an embodiment of the present invention is shown in FIGS. 1 to 5, and the periphery of the combustion chamber is shown in an enlarged view in FIG.
  • FIG. 7 is a sectional view taken along the line VII-VII of FIG.
  • the nailing machine 101 is an example of the “combustion-type power tool” in the present invention.
  • an outer shell of the nailing machine 101 is formed by a main housing 103, an injection unit 110, a hand grip 105, and a magazine 109. Is formed.
  • the first combustion chamber 121 and the second The firing chamber 122, the ignition device 131, the fuel injection device 141, and the drive unit 151 are accommodated.
  • nailing machine 101 is configured to have a plurality of combustion chambers including first combustion chamber 121 and second combustion chamber.
  • the injection unit 110 side will be described as a front side (left side in FIGS. 1 to 5), and the opposite side (right side in FIGS. 1 to 5) as a rear side.
  • the first combustion chamber 121 is used as an ignition region for the air-fuel mixture, which will be described later, and the second combustion chamber 122 is used as a region for obtaining a large combustion energy required for nail driving work. It is configured to be used as The first combustion chamber 121 corresponds to the “first combustion chamber” in the present invention, and the second combustion chamber 122 corresponds to the “second combustion chamber” in the present invention.
  • the first combustion chamber 121 includes a partition 123 having a circular outer shape for partitioning the first combustion chamber 121 from the second combustion chamber 122, and a substantially flat shape located on the opposite side to the second combustion chamber 122. And a circular slide end plate 129 having an end wall surface.
  • the partition wall portion 123 has a flat surface portion 123a on the outer peripheral side and a spherical portion 123b bulging toward the second combustion chamber 122 at the center portion side. 123a is fixed in contact with the end wall surface of the slide end plate 129 in close contact.
  • the partition 123 described above corresponds to the “partition” in the present invention.
  • the spherical portion 123b of the partition wall portion 123 is formed to have substantially the same diameter and a hemispherical shape with the ignition portion of the ignition device 131 as a center.
  • a large number of communication holes 125 are formed in the spherical portion 123b of the partition wall 123 in a perforated shape (see FIG. 7).
  • the first combustion chamber 121 and the second combustion chamber 122 are in communication with each other via the communication hole 125.
  • the igniter force is also set such that the distance to each communication hole 125 is equal to each other, and when the air-fuel mixture in the first combustion chamber 121 is ignited by the igniter of the igniter 131 and burns, The combustion surface (fire surface) in one combustion chamber 121 reaches each communication hole 125 almost simultaneously.
  • the igniter is composed of two electrodes 133a and 133b which are arranged facing each other with a predetermined gap therebetween, which will be described later.
  • the second combustion chamber 122 is formed as a space surrounded by a piston 155, a cylindrical slide sleeve 127, and a partition wall 123 disposed opposite to the piston 155, which constitute a driving unit.
  • the piston 155 corresponds to the “piston member” in the present invention.
  • the top surface (the surface facing the partition wall 123) of the bistone 155 is a spherical concave portion 155a formed in a similar shape to the spherical portion 123b of the partition wall 123.
  • the partition wall 123, the slide sleeve 127, and the slide end plate 129 are fastened and fixed to each other by a plurality of screws 128 arranged in a circumferential direction, and a cylindrical combustion chamber having a front end opened by these three members.
  • a wall 126 is configured. That is, the slide sleeve 127 forms the peripheral wall surface of the second combustion chamber 122, the partition wall 123 forms the end wall surface of the second combustion chamber 121 and the spherical wall surface of the first combustion chamber 121, respectively.
  • the end wall surface of the first combustion chamber 121 is constituted by 129.
  • the combustion chamber wall 126 corresponds to the “movable member” in the present invention.
  • the combustion chamber wall 126 is movable in the long axis direction (front-rear direction) of the nailing machine 101, and is connected to the contact arm 111.
  • the contact arm 111 is normally urged forward (forward) by a spring 112 as urging means, and the combustion chamber wall 126 is also moved forward.
  • This state is the initial state of the nailing machine 101 shown in FIG. 1, and the volume of the second combustion chamber 122 is zero or close to zero and is reduced to the state.
  • the second combustion chamber 122 has a configuration in which the volume changes with the movement of the combustion chamber wall 126, and is formed by the partition wall 123 and the slide end plate 129 which are fixed to each other and move together.
  • the first combustion chamber 121 is configured to have a steady volume whose volume does not change. That is, the combustion chamber is composed of the first combustion chamber 121 whose volume does not change even if the combustion chamber wall 126 moves back and forth, and the second combustion chamber 122 whose volume changes. ing.
  • a small diameter portion 127a having a small inner diameter is formed at the front end (opening end side) of the slide sleeve 127 in the combustion chamber wall 126.
  • the small diameter portion 127a has a circular flange portion 153a formed on the outer periphery of an end portion of a cylinder 153 described later and an O-ring 154 on the outer peripheral surface.
  • the second combustion chamber 122 is hermetically sealed by sealing through.
  • the second combustion chamber 122 is a gap between the inner space 104 of the housing 103 (a gap between the housing 103 and the outer peripheral surface of the cylinder 153, and communicates with the outside of the nailing machine 101 through the gap 127b. ).
  • An atmosphere chamber 171 is formed on the opposite side (rear side) of the first and second combustion chambers 121 and 122 with the slide end plate 129 interposed therebetween.
  • the atmosphere chamber 171 is formed by a cylindrical fixed sleeve 177, a slide end plate 129 slidably fitted in the fixed sleeve 177, and a fixed end plate 175 arranged to face the slide end plate 129. It is formed as an enclosed space.
  • the fixed end plate 175 and the fixed sleeve 177 are formed integrally.
  • the fixed end plate 175 forms the end wall surface of the air chamber 171
  • the fixed sleeve 177 forms the peripheral wall surface of the air chamber 171
  • these two members form the cylindrical air chamber wall 173 whose front end is open. ing.
  • the sliding surfaces of the fixed sleeve 1 77 and the slide end plate 129 are sealed via an O-ring 179.
  • the fixed end plate 175 is fastened to the main housing 103 together with a housing cap 106 having a large number of ventilation holes 106 b whose outer peripheral edge is disposed at the rear end of the main housing 103 by screws (not shown).
  • the atmosphere chamber 171 is a space separated and fixed from the first and second combustion chambers 121 and 122, and moves with the movement of the combustion chamber wall 126, directly with the movement of the slide end plate 129. It is set as a space where the volume changes. That is, when the slide end plate 129 moves (forwards) in the direction of decreasing the volume of the second combustion chamber 122, the volume of the atmosphere chamber 171 increases and moves in the direction of increasing the volume of the second combustion chamber 122. Atmosphere 1 The configuration is such that the volume of 71 is reduced.
  • the maximum volume of the atmosphere chamber 171 is set to be larger than the total volume of the first and second combustion chambers 121 and 122 when the volume of the second combustion chamber 121 is maximized.
  • the fixed end plate 175 in the atmosphere chamber wall 173 has a space 106a surrounded by the fixed end plate 175 and the housing cap 106 (substantially, the atmosphere, hereinafter, this space 106a is simply referred to as the atmosphere).
  • An intake port 161 is provided for communicating the air with the atmosphere chamber 171.
  • the intake port 161 is provided with an intake valve 163.
  • the intake valve 163 is configured as a check valve that opens and closes the intake port 161 to suck atmospheric air into the atmosphere chamber 171, and is arranged on the atmosphere chamber 171 side.
  • the suction valve 163 elastically deforms toward the atmosphere chamber 171 based on the pressure difference between the inside and the outside of the atmosphere chamber 171 to allow the flow of air to the atmosphere power atmosphere chamber 171 and restricts the reverse flow. Configuration.
  • the above-described intake port 161 and intake valve 163 constitute "first valve means" in the present invention.
  • the slide end plate 129 has an intake port 165 communicating the atmosphere chamber 171 and the first combustion chamber 121, and the intake port 165 is provided with an intake valve 167.
  • the suction valve 167 is configured as a check valve that opens and closes an intake port 165 to suck the air in the atmosphere chamber 171 into the first combustion chamber 121, and is arranged on the first combustion chamber 121 side.
  • the intake valve 167 elastically deforms toward the first combustion chamber 121 based on the pressure difference between the first combustion chamber 121 and the atmosphere chamber 171 to reduce the flow of air from the atmosphere chamber 171 to the first combustion chamber 121. It is configured to allow and restrict the reverse flow.
  • the above-described intake port 165 and intake valve 167 constitute the “second valve means” in the present invention.
  • the fixed end plate 175 in the atmosphere chamber wall 173 is provided with a rod-shaped seal member 169 that projects into the atmosphere chamber 171 at a predetermined length.
  • the seal member 169 is disposed so as to face the intake port 165 for the combustion chamber, and when the combustion chamber wall 126 is located at the retreat end (rear end stroke end), the intake port for the combustion chamber is provided.
  • the intake port 165 is sealed, and in the fitted state, the front end surface is in contact with the back surface (rear surface) of the suction valve 167.
  • the ignition device 131 is mainly composed of an ignition plug 133 and a piezoelectric element 138 that generates a high-voltage current, and has one electrode ( An anode 133a is arranged at the center of the slide end plate 129 that forms the end wall surface of the first combustion chamber 121.
  • the other electrode (cathode) 133b constituting the ignition portion of the ignition plug 133 is disposed at a position where the force at the center of the slide end plate 129 is also removed, and extends to the center of the first combustion chamber 121.
  • the electrode 133a is opposed to the tip (front end) of the one electrode 133a with a predetermined gap.
  • the ignition part of the ignition plug 133 corresponds to the “ignition part” in the present invention
  • the piezoelectric element 138 corresponds to the “power supply part” in the present invention.
  • One electrode 133 a is electrically connected to piezoelectric element 138 via a conductive material (metal) ball (steel ball) 134 provided on fixed end plate 175, spring 135 and electric wiring 136.
  • a conductive material (metal) ball (steel ball) 134 provided on fixed end plate 175, spring 135 and electric wiring 136.
  • the ball 134 is disposed so as to face the rear end of the one electrode 133a, and is brought into contact with or separated from the one electrode 133a as the combustion chamber wall 126 moves forward or backward. That is, when the combustion chamber wall 126 is moved to a position near the maximum volume of the second combustion chamber 122, the one electrode 133a is electrically connected to the ball 134 to permit ignition.
  • the electrical connection is cut off by separating from the ball 134, so that ignition is restricted.
  • the above-described ball 134 and spring 135 constitute an “energization control unit” in the present invention. Further, the position where the volume of the second combustion chamber 122 is near the maximum corresponds to the “combustible position” in the present invention.
  • the ball 134 is movably fitted into a hole 137a of a holding member 137 provided on the fixed end plate 175 and having an electric insulating material strength, and is urged toward the electrode 133a by a spring 135. .
  • the spring 135 constitutes an urging means for stably holding the contact state between the ball 134 and the electrode 133a over a predetermined range.
  • the ignition operation of the ignition device 131 is performed by deforming the piezoelectric element 138 by the drawing operation of the trigger 107 disposed on the hand grip 105, This is achieved by discharging the generated high-voltage current between the electrodes 133a and 133b.
  • the other electrode 133b is body-grounded to the slide end plate 129.
  • the above-described trigger 107 corresponds to “ignition operating means” in the present invention.
  • the fuel injection device 141 mainly includes a pipe-shaped member 145 that extends from the first combustion chamber 121 through the partition wall 123 to the second combustion chamber 122, and the pipe-shaped member 145 includes: Fuel injection holes 143 are formed in appropriate locations facing the combustion chambers 121 and 122.
  • the fuel injector 141 is connected to a fuel container (fuel cylinder) 149 to receive fuel.
  • the amount of fuel injected by the fuel injection device 141 is set individually according to the effective volumes of the first combustion chamber 121 and the second combustion chamber 122.
  • the pipe-shaped member 145 constituting the fuel injection device 141 is fixed to the slide end plate 129, and one end (tip) side of the inner periphery of the spherical portion 123 b of the partition wall 123 constituting the first combustion chamber 121. It extends along the surface and penetrates through the center of the spherical portion 123b and projects to the second combustion chamber 122. As shown in FIG. 7, the projecting tip 145 a of the pipe-shaped member 145 that penetrates the spherical portion 123 b and protrudes into the second combustion chamber 122, without dispersing the fuel into the second combustion chamber 122.
  • a plurality of fuel injection holes 143 penetrating radially (radially) to be injected are provided.
  • the combustion chamber wall 126 moves in the direction of decreasing the volume of the second combustion chamber 122, the projecting tip 145a of the pipe-shaped member 145 is accommodated in a storage space 155b formed in the center of the top surface of the piston 155.
  • the volume of the second combustion chamber 122 can be reduced to zero or a state close to zero.
  • the pipe-like member 145 has at least a fuel injection into the first combustion chamber 121 at a curved portion 145b arranged along the inner peripheral surface of the spherical portion 123b. It has one fuel injection hole 143.
  • the combustion injection hole 143 is set so as to inject fuel toward an ignition portion of the ignition device 131.
  • the other electrode 133b of the electrodes 133a and 113b constituting the ignition portion of the ignition device 131 is disposed in a protruding manner in the first combustion chamber 121, and a predetermined gap (plug gap) is formed in one of the electrodes 133a. It is configured to bend into an L-shape and extend to oppose.
  • the pipe-shaped member 145 is arranged so as to inject the fuel toward the back side of the other electrode 133b. I have. That is, the pipe-shaped member 145 The fuel force injected from the fuel injection hole 134 of the curved portion 145b is disposed so as to be injected toward the one electrode 133a with the extending portion of the other electrode 133b interposed therebetween.
  • the pipe-like member 145 has at least a fuel injection into the first combustion chamber 121 at a curved portion 145b arranged along the inner peripheral surface of the spherical portion 123b. It has one fuel injection hole 143.
  • the combustion injection hole 143 is set so as to inject fuel toward an ignition portion of the ignition device 131.
  • the other electrode 133b of the electrodes 133a and 113b constituting the ignition portion of the ignition device 131 is disposed in a protruding manner in the first combustion chamber 121, and a predetermined gap (plug gap) is formed in one of the electrodes 133a. It is configured to bend into an L-shape and extend to oppose.
  • the pipe-shaped member 145 is arranged so as to inject the fuel toward the back side of the other electrode 133b.
  • the pipe-shaped member 145 is disposed so as to inject fuel toward one electrode 133a with the fuel force injected from the fuel injection hole 134 of the curved portion 145b sandwiching the extending portion of the other electrode 133b.
  • the curved portion 145b of the pipe-shaped member 145 corresponds to the “portion arranged along the spherical portion” in the present invention, and the protruding tip 145a corresponds to the “portion protruding into the second combustion chamber” in the present invention. Corresponding.
  • the other end (base end) of the pipe-shaped member 145 extends between the outer peripheral surface of the slide sleeve 127 and the inner peripheral surface of the fixed sleeve 177 and is supplied from the fuel container 149.
  • the fuel supply passage member 146 for guiding the fuel is inserted into the fuel supply passage 147, and slides in the fuel supply passage 147 as the combustion chamber wall 126 moves.
  • the supply of fuel from the fuel container 149 is performed in conjunction with the operation of pressing the contact arm 111 against the work material W to be worked.
  • the drive unit 151 includes a cylinder 153 housed in the main housing 103, a piston 155 slidably disposed in the cylinder 153, and a piston rod 157 integrally connected to the piston 155. Is composed mainly of.
  • the cylinder 153 corresponds to the “guide cylinder” in the present invention.
  • the distal end side of the piston rod 157 is connected to an injection device arranged in the injection portion 110 for driving a nail (not shown) forward.
  • the front end inside the cylinder 153 absorbs and reduces the impact of the high-speed driven piston 155, A cushion rubber 159 for receiving 5 is appropriately arranged.
  • the cylinder 153 is provided with a check valve 113 for opening and closing a ventilation port 114 communicating the inside of the bore 153a of the cylinder 153 with the internal space 104 of the housing 103.
  • This one-way valve 113 allows the gas in the bore 153a of the cylinder 153 to flow out into the internal space 104, while restricting the gas in the internal space 104 from flowing into the bore 153a of the cylinder 153. It is configured as
  • the magazine 109 is attached to an injection portion 110 formed on the tip side of the main nozzle 103 of the nailing machine 101, and accommodates a large number of interconnected nails and removes nails to be driven. Face the injection unit 110. Since the configuration of the magazine 109 itself is well known, a detailed description thereof will be omitted for convenience.
  • the above-described contact arm 111 is provided at the tip of the injection unit 110.
  • the contact arm 111 is positioned in the longitudinal direction of the injection unit 110 (that is, in the longitudinal direction of the nailing machine 101 and corresponds to the left-right direction in FIGS. 1 to 5), and relatively to the injection unit 110. It is slidable, and is normally urged by a spring 112 toward the distal end (to the left in FIGS. 1 to 5). Note that the spring 112 also serves as a biasing means for the slide sleeve 127 described above.
  • the nailing machine 101 is configured as described above. Next, the operation of the nailing machine 101 will be described.
  • the nailing machine 101 always has the state shown in FIG. 1 as an initial state. In this initial state, the combustion chamber wall 126 is moved forward by the urging force of the spring 112, and the volume of the second combustion chamber 122 is reduced to a minimum (zero or nearly zero), and the volume of the atmosphere chamber 171 is reduced. Has been increased to the maximum.
  • the piston 155 is located at the top dead center. Also, one electrode 133a of the ignition plug 133 is separated from the ball 134 by the force of the ball 134, and the electrical connection to the electrode 133a is cut off to restrict the ignition of the plug.
  • the contact arm 111 In this state, in order to perform the nail driving operation using the nailing machine 101, as shown in FIG. 2, the contact arm 111 first contacts the workpiece W, and then the worker The pressing force toward the workpiece is applied to the nailing machine 101. Then, the contact arm 111 retreats to the side away from the workpiece W while resisting the urging force of the spring 1 12. The retreating operation of the contact arm 111 causes the combustion chamber wall 126 connected to the contact arm 111 to move. Operates backward. The retreating operation of the combustion chamber wall 126 increases the volume of the second combustion chamber 122 and decreases the volume of the atmosphere chamber 171.
  • the movement of the combustion chamber wall 126 is regulated by the outer peripheral rear end of the slide end plate 129 abutting on the outer peripheral front end surface of the fixed end plate 175 of the atmosphere chamber wall 173.
  • the volume of the second combustion chamber 122 is set to the maximum state, and the volume of the atmosphere chamber 171 is set to the minimum state. Further, the volume of the first combustion chamber 121 and the volume of the second combustion chamber 122 are set to a predetermined volume ratio.
  • the second combustion chamber 122 fuel is radially injected into the second combustion chamber 122 from the fuel injection holes 143 at the protruding tip 145 a.
  • the amount of fuel supplied to the first and second combustion chambers 121, 122 is set in accordance with the volumes of the respective combustion chambers 121, 122. Further, the injected fuel is mixed with the air in each of the combustion chambers 121 and 122, whereby the inside of each of the combustion chambers 121 and 122 is filled with the air-fuel mixture. This mixture corresponds to the “flammable gas” in the present invention.
  • fuel is supplied from the fuel container 149 when the combustion chamber wall 126 approaches the retreat end, and the fuel is supplied to the fuel supply passage 147 and the nove-like member 145.
  • the fuel is supplied to the combustion chambers 121 and 122 through fuel injection holes 143 provided in the pipe-shaped member 145.
  • a fuel that enhances the ignition effect at the time of ignition performed thereafter is supplied with an ignition fuel. Injection is directed toward the center of the gear, that is, the ignition portion.
  • the second combustion chamber 122 fuel is radially injected from the fuel injection holes 143 in the radial direction of the second combustion chamber 122.
  • the amount of fuel supplied to the first and second combustion chambers 121 and 122 is set according to the volumes of the respective combustion chambers 121 and 122. Further, the injected fuel is mixed with the air in each of the combustion chambers 121 and 122, whereby the interior of each of the combustion chambers 121 and 122 is filled with the air-fuel mixture.
  • This mixture corresponds to “flammable gas” in the present invention.
  • the ignition operation by the ignition device 131 provided in the first combustion chamber 121 is performed.
  • the ignition and combustion operation in the first combustion chamber 121 is realized smoothly and with high efficiency.
  • the ignition device 131 When the ignition device 131 performs an ignition operation, as shown in FIG. 3, the air-fuel mixture filled in the first combustion chamber 121 is ignited from the vicinity of the ignition section, and the mixture in the first combustion chamber 121 is ignited. The combustion of the gas starts. The combustion effect of the air-fuel mixture is explosive, and the combustion surface (fire surface) of the air-fuel mixture reaches the partition 123 in a very short time. At this time, in the present embodiment, since the partition wall portion 123 is formed as a spherical portion 123b having a substantially equal diameter centered on the ignition portion, the combustion surface of the air-fuel mixture that also generates the ignition portion force is formed by the ignition portion. Reaches the spherical surface portion 123b having the same radius with respect to. For this reason, the ignition timing of the second combustion chamber 122 can be standardized for each communication hole 125 over the entire boundary surface of the partition wall 123, and the combustion start timing in the second combustion chamber 122 can be effectively reduced. It is possible to control it
  • the air-fuel mixture filled in the second combustion chamber 122 is simultaneously ignited from the entire surface area of the partition wall 123 through the respective communication holes 125, and the combustion of the air-fuel mixture in the second combustion chamber 122 starts. Is done.
  • the volume of the second combustion chamber 122 is set to be larger than the volume of the first combustion chamber 121, and the combustion of the air-fuel mixture in the second combustion chamber 122 generates a large combustion pressure.
  • the piston 155 is slidably moved (forward) in the cylinder 153 toward the workpiece.
  • the suction valve is formed by the seal member 169 inserted into the intake port 165 for the combustion chamber.
  • the piston rod 157 moves linearly in the direction of the workpiece, thereby causing the nail set in the injection unit 110 to be heated. It is injected and driven at high speed to the material side. At this time, the piston 155 that has moved at a high speed in the cylinder 153 in the direction of the workpiece comes into contact with the cushion rubber 159, and its kinetic energy is absorbed and reduced, and the piston 155 stops. That is, the piston 155 reaches the bottom dead center and stops. This state is shown in FIG.
  • the exhaust gas in the first and second combustion chambers 121 and 122 used for the forward movement of the piston 155 is provided.
  • the gas is discharged outside the room (the internal space 104 of the nozzle 103) through the check valve 113.
  • the exhaust gas is discharged from the check valve 113, and a contraction cooling action is generated in the first and second combustion chambers 121 and 122.
  • a negative pressure is generated in the first and second combustion chambers 121 and 122, and a suction action is generated.
  • the piston 155 automatically starts the retreating operation to the side away from the workpiece W.
  • the intake port 165 for the combustion chamber is sealed by the seal member 169, air is prevented from flowing from the atmosphere chamber 171 into the first combustion chamber 121, and the piston 155 Can be reliably returned to the initial position.
  • the forward movement of the combustion chamber wall 126 in the direction of the tip is controlled by the timing at which the worker releases the pressing load on the nailing machine 101 in the direction of the workpiece.
  • the forward movement of the chamber wall 126 is performed after the backward movement of the piston 155 is completed. That is, the retreating operation of the piston 155 is instantaneously performed by the suction force (negative pressure) generated in the first and second combustion chambers 121 and 122 due to the cooling operation. Therefore, as long as the operator normally releases the pressing force of the nailing machine 101 toward the workpiece, the piston 155 ends the retreating operation before the forward movement of the combustion chamber wall 126 is started. To the initial position (see Fig. 4) before starting the forward movement.
  • the volume of the second combustion chamber 122 is reduced, and the space between the inner peripheral surface of the slide sleeve 127 and the outer peripheral surface of the flange portion 153a is reduced.
  • the second combustion chamber 122 is communicated with the outside through the gap 127b.
  • the exhaust gas in the second combustion chamber 122 is discharged outside through the gap 127b as the volume of the second combustion chamber 122 is reduced.
  • the forward movement of the combustion chamber wall 126 moves the slide end plate 129 away from the fixed end plate 175, thereby increasing the volume of the atmosphere chamber 171 and at the same time, moving the seal member 169 from the combustion chamber intake port 165.
  • the air exits and the intake port 165 is opened. Further, one electrode 133a is separated from the ball 134, and the electrical connection is cut off.
  • the pressure in the atmosphere chamber 171 decreases accordingly.
  • the air in the housing cap 106 is sucked by pushing the intake valve 163 out of the suction port 161 for the atmosphere chamber.
  • the intake valve 167 for the combustion chamber is brought into close contact with the peripheral portion of the intake port 165 for the combustion chamber, and the exhaust gas in the first combustion chamber 121 flows into the atmosphere chamber 171. Prevent spillage (leakage).
  • the combustion chamber wall 126 When the combustion chamber wall 126 reaches the forward end (stroke end), the volume of the second combustion chamber 122 becomes minimum (zero), and the exhaust gas in the second combustion chamber 122 is discharged outside the chamber.
  • the capacity of the atmosphere chamber 171 is maximized, and fresh air is stored in the atmosphere chamber 171. That is, it returns to the initial state shown in FIG.
  • the distal end protruding portion 145a of the pipe-shaped member 145 protruding into the second combustion chamber 122 is accommodated in the storage space 155b provided in the piston 155.
  • the combustion chamber wall 126 is moved backward as described above. This state is shown in FIG.
  • the retreating operation of the combustion chamber wall 126 increases the volume of the second combustion chamber 122 and decreases the volume of the atmosphere chamber 171, so that the air in the atmosphere chamber 171 is compressed and the intake air for the combustion chamber is reduced.
  • the suction valve 167 is pushed away from the port 165 and is forcibly pushed into the first combustion chamber 121.
  • the exhaust gas remaining in the first combustion chamber 121 is pushed out through the communication hole 125 to the second combustion chamber 122, and further the gap 127b is formed.
  • the combustion chamber wall 126 When the combustion chamber wall 126 reaches the retreat end (the state shown in FIG. 2), the inside of the first and second combustion chambers 121 and 122 is filled with fresh air.
  • the maximum volume of the large air chamber 171 is set to be larger than the maximum total volume of the first and second combustion chambers 121 and 122.
  • air having a volume larger than those volumes is sent into the first and second combustion chambers 121 and 122, and the exhaust gas in the first and second combustion chambers 121 and 122 is reliably discharged to the outside. And can be replaced with fresh air.
  • the electrode (anode) 133 a contacts the ball 134, and is electrically connected to the piezoelectric element 138 via the ball 134, the spring 135, and the electric wiring 126.
  • the ignition operation is allowed.
  • the seal member 169 is inserted into the intake port 165 for the combustion chamber to seal the intake port 165, and comes into contact with the back surface of the intake valve 167 to prepare for the action of high pressure on the intake valve 167.
  • the outer peripheral surface of the flange 153a of the inner cylindrical surface 153 of the / J diameter 127a of the slide sleeve 127 is slidably contacted with the outer peripheral surface of the flange 153a via the O-ring 154, and the gap 127b is closed. Thereby, the second combustion chamber 122 is made a closed space.
  • the combustion chamber wall 126 is After the exhaust gas in the second combustion chamber 122 is exhausted to the outside, the air taken into the atmosphere chamber 171 is forced into the first combustion chamber 121.
  • the exhaust gas remaining in the first combustion chamber 121 is discharged from the first combustion chamber 121 to the outside through the second combustion chamber 122.
  • the exhaust gas in the first and second combustion chambers 121 and 122 which does not change the volume of the first combustion chamber 121, is efficiently discharged to the outside, and the first and second combustion chambers 121 and 122 are effectively exhausted. It is possible to fill the inside with fresh air.
  • the first combustion chamber 121 is designed to improve the combustion efficiency of the air-fuel mixture.
  • a spark plug 133 is provided, and the partition wall 123 is provided with an ignition portion so that the combustion surface of the air-fuel mixture ignited by the ignition unit in the first combustion chamber 121 reaches the communication hole 125 of the partition wall 123 at substantially the same time.
  • It has a configuration having a spherical portion 123b with an equal radius at the center. With such a configuration, it is difficult to change (decrease) the volume of the first combustion chamber 121 to discharge the exhaust gas.
  • the second combustion chamber 121 Exhaust while maintaining the configuration in which the shape of the partition 123 forming the first combustion chamber 121 is formed to be hemispherical, which improves the combustion efficiency of the air-fuel mixture by efficiently injecting the flame into the combustion chamber 122.
  • the gas discharge function can be effectively performed.
  • the maximum volume of the atmosphere chamber 171 is set to be larger than the total volume of the first and second combustion chambers 121 and 122, those volumes are stored in the first and second combustion chambers 121 and 122. By sending more air, the exhaust gas and air can be exchanged reliably.
  • V and so-called backflow prevention means are configured by sending air having a volume larger than the volume of the first and second combustion chambers 121 and 122, so that the exhaust gas Backflow into the combustion chamber can be reliably prevented.
  • the first combustion chamber 121 has a stationary configuration in which the volume does not change, so that the ignition device 131 or the pipe-shaped member 145 for supplying fuel is provided in the center of the first combustion chamber 121. Can be set. Thereby, the flame (combustible gas combustion surface) generated in the first combustion chamber 121 can be uniformly and efficiently injected into the second combustion chamber 122.
  • the sealing member 169 is inserted into the combustion chamber intake port 165 to seal the intake port 165. are doing. Therefore, during the combustion of the first and second combustion chambers 121 and 122, the predetermined performance is maintained by suppressing the loss of combustion energy due to the gas in the first combustion chamber 121 leaking to the atmosphere chamber side. Also, during contraction cooling in the first and second combustion chambers 121 and 122 (at the time of negative pressure), the air in the atmosphere chamber 171 is prevented from flowing into the first combustion chamber 121 to move the piston 155 to the initial position. It is possible to reliably return to.
  • ball 134 electrically connected to piezoelectric element 138 is arranged so as to face one electrode 133a constituting the ignition portion, and combustion chamber wall 126 is retracted.
  • the electrode 133a When moving to the vicinity of the end, the electrode 133a is brought into contact with the electrode 133a to allow current to flow.
  • the combustion chamber wall 126 When the combustion chamber wall 126 is located at a position forward of the vicinity of the retreat end, the electrode 133a should be separated from the electrode 133a. In this configuration, the current supply to the electrode 133a is regulated.
  • the first and second combustion chambers 121 and 122 are empty.
  • the nailing machine 101 configured to move the combustion chamber wall 126 to introduce air or discharge exhaust gas, it is possible to rationally supply power to the ignition unit while enabling cordless operation for the ignition unit. Can be.
  • the electric wiring is It is necessary to set the slack part necessary to allow the movement, and to secure the accommodation space on the housing side to accommodate the slack part of the electric wiring.
  • the brute force problem can be solved, and the ignition portion, and furthermore, the combustion chamber wall 126 can be largely moved without being restricted by the cord.
  • the electrode 133a can be energized, so that ignition in the first combustion chamber 121 can be reliably performed at the time when ignition is required.
  • the ball 134 and the spring 135 for urging the ball 134 are used as current-carrying members, respectively, and the ball 134 is configured to follow the electrode 133a in a predetermined range together with the electrode 133a in contact with the electrode 133a. .
  • the width of the energization region can be increased, and the power supply operation can be stabilized.
  • the impact at the time of contact between the electrode 133a and the ball 134 can be absorbed by the elastic deformation of the spring 134, and the power supply function can be maintained even if wear progresses.
  • the inner wall surface (end slide plate 129) of the first combustion chamber 121 in the long axis direction is formed by a flat surface, and the ignition portion is disposed at the center thereof.
  • a tapered or curved concave portion is formed so as to face the piston 155 side toward the periphery of the inner wall surface. May be substantially flush with each other, that is, a substantially flat surface may be formed.
  • the igniting portion that actually ignites the flammable gas is connected to the concave portion of the inner wall surface in a flush manner, so that the combustion surface of the flammable gas has a concave shape from the start of ignition.
  • the nailing machine 101 having a configuration in which the combustion chamber is divided into the first and second combustion chambers 121 and 122 has been described, but a single combustion chamber is formed. It may be applied to a nailing machine with a configuration. Further, in the present embodiment, for example, a ring-shaped or sleeve-shaped current-carrying member is provided in place of the force constituted by the ball 134 and the spring 135 serving as the conductive material, and the current-carrying control section is provided with the electrodes 133a. It is also possible to adopt a configuration in which energization is allowed by inserting a.
  • the configuration is such that the energization of the igniter is permitted by direct contact of the ball 134 with the electrode 133a, but a configuration in which the ball 134 directly contacts the electrode 133a may be employed.
  • a conductive piece whose one end is connected to one electrode 133a, which is directly on the slide end plate 129 of the combustion chamber wall 126, is appropriately set via a bracket, and is connected to the other end of the conductive piece.
  • a terminal is set, and the terminal and a current-carrying member such as a ball are arranged to face each other, and the contact or separation between the terminal and the current-carrying member allows or restricts current supply to the ignition part.
  • the present embodiment is applicable to the force described in the case of the nailing machine, that is, the tacking force used for the so-called stable driving operation.
  • the projecting tip 145a of the pipe-shaped member 145 that penetrates the spherical portion 123b and projects into the second combustion chamber 122 is indicated by the center line of the projecting tip 145a.
  • the fuel is arranged so as to be located on a center line extending in the longitudinal direction through the center of the second combustion chamber 122, and as shown in FIG. 7, fuel is injected from a fuel injection hole 143 provided at the projecting tip 145a. Injection is performed in the radial direction of the second combustion chamber 122. Therefore, the fuel can be uniformly supplied over the entire circumferential region in the second combustion chamber 122 without unevenness. As a result, the fuel and air are efficiently mixed, and the combustion efficiency can be improved.
  • the combustion pressure generated by combustion is equalized in the circumferential area in the combustion chamber, so that the combustion energy in the combustion chamber is transmitted to the piston member with good non-lance, and stable driving of the piston member is realized. Is done.
  • the piston 155 is provided with a storage space capable of accommodating the distal end protruding portion 145a of the pipe-shaped member 145, so that the distal end protruding when the volume of the second combustion chamber 122 is reduced is provided.
  • the interference of the part 145a with the piston 155 can be avoided.
  • a configuration in which distal end protruding portion 145a is arranged on the center line of second combustion chamber 122 is provided.
  • the storage space 155b is also set at the axial center of the piston 155 in accordance with this arrangement.
  • a fuel that improves the ignitability of the combustible gas when discharged between electrodes 133a and 133b of ignition device 131 is injected toward the ignition portion of ignition device 131.
  • the fuel is injected toward the back of the electrode 133b, so that a large amount of lubricating oil mixed in the fuel directly falls on the discharge section at the tip of the electrode. It is possible to avoid the adverse effects caused by this.
  • a portion of slide end plate 129 that faces spherical portion 123 b of partition wall 123, that is, the mounting surface of ignition plug 133 is formed as a flat surface. It may be formed by a spherical concave surface. In this case, it is preferable to set the center of the concave surface so as to be the deepest portion, and to install the ignition plug 133 at the portion.
  • the suction valve 163 for the combustion chamber and the suction valve 167 for the atmosphere chamber are each constituted by a reed valve.
  • One or both of the suction valves 163 and 167 are spool valves. It's composed of
  • the backflow prevention means may be constituted by a method different from the method of changing the capacity of the atmosphere chamber 171 and the first and second combustion chambers 121 and 122.
  • FIG. 9 and 10 show modifications of the configuration of the ignition device 131.
  • an electrode holding portion 234 capable of holding one electrode 133a in a linear shape (or a planar shape) is used instead of the ball 134 and the spring 135 described above.
  • the electrode holding portion 234 has a neck-shaped bent portion 235 that is electrically connected to a piezoelectric element 138 (not shown) (see FIG. 1 and the like) and that applies an elastic force so as to sandwich the electrode 133a.
  • a piezoelectric element 138 not shown
  • FIG. 10 shows that when the combustion chamber wall 126 retreats and moves to make the volume of the second combustion chamber 122 close to the maximum, one electrode 133a is moved to the bent portion 235 of the electrode holding portion 234. Will be retained.
  • the electrode 133a is linearly (or planarly) brought into contact with the bent portion 235 by being inserted between a pair of bent portions 235 formed long in the longitudinal direction of the electrode 133a.
  • the bent portion 235 exerts an elastic force so as to clamp the electrode 133a. Therefore, the electrode holding section 234 can hold the electrode 133a firmly.
  • the one electrode 133a is electrically connected to the piezoelectric element 138 through the electrode holding part 234, so that a discharge occurs between the electrodes 133a and 133b.
  • FIG. 1 is a partial front sectional view showing the entire configuration of the nailing machine according to the present embodiment, showing an initial state in which a biston is located at a top dead center.
  • FIG. 2 is a partial cross-sectional front view showing the entire configuration of the nailing machine, showing a state in which the volume of the second combustion chamber is maximized by the retraction of the combustion chamber wall.
  • FIG. 3 is a partial cross-sectional front view showing the entire configuration of the nailing machine, showing a nailing completed state in which the piston has been moved to the bottom dead center.
  • FIG. 4 is a partial front cross-sectional view showing the entire configuration of the nailing machine, showing an exhaust state of exhaust gas from the second combustion chamber.
  • FIG. 5 is a partial front sectional view showing the entire configuration of the nailing machine, showing the state of exhaust of residual exhaust gas in the first combustion chamber.
  • FIG. 6 is an enlarged sectional view of a periphery of a combustion chamber.
  • FIG. 7 is a sectional view taken along line VII-VII in FIG. 6.
  • FIG. 8 is an enlarged cross-sectional view of the periphery of the combustion chamber, showing a state where the volume of the second combustion chamber is maximized.
  • FIG. 9 is a partial cross-sectional view showing a configuration of a modified example of the ignition device.
  • FIG. 10 is a partial cross-sectional view showing a configuration of a modified example of the same ignition device.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Abstract

[PROBLÈMES] Une technique permettant d’évacuer de manière rationnelle le gaz de combustion dans une chambre de combustion dans un outil de travail de type à combustion. [RÉSOLUTION DES PROBLÈMES] Un outil de travail de type à combustion a un élément mobile (126) qui peut se déplacer de sorte à faire varier les volumes des chambres de combustion (121, 122) et une chambre à l’atmosphère (171) est fournie dans l’outil de travail. Le volume de la chambre à l’atmosphère (171) augmente lorsque l’élément mobile se déplace dans la direction permettant de réduire le volume des chambres de combustion, et le volume de la chambre à l’atmosphère diminue lorsque l’élément mobile se déplace dans la direction permettant d’augmenter le volume des chambres de combustion. Lorsque le piston (155) a terminé le processus, lorsque l’élément mobile (126) se déplace dans la direction permettant d’augmenter le volume de la chambre à l’atmosphère (171) tout en réduisant le volume de la chambre de combustion (122), de l’air est aspiré de l’extérieur dans la chambre à l’atmosphère (171) alors que le gaz de combustion de la chambre de combustion (122) est évacué vers l’extérieur de la chambre, et lorsque l’élément mobile (126) se déplace dans la direction permettant de réduire le volume de la chambre à l’atmosphère (171) tout en augmentant le volume de la chambre de combustion (122), le gaz de combustion restant dans la chambre de combustion (121) est évacué vers l’extérieur de la chambre tout en comprimant l’air dans la chambre à l’atmosphère (171) pour le forcer dans la chambre de combustion (121).
PCT/JP2005/008644 2004-05-17 2005-05-11 Outil de travail de type à combustion WO2005110684A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2004146895A JP4584623B2 (ja) 2004-05-17 2004-05-17 燃焼式作業工具
JP2004-146895 2004-05-17
JP2004-178963 2004-06-16
JP2004178963A JP4485263B2 (ja) 2004-06-16 2004-06-16 燃焼式作業工具

Publications (1)

Publication Number Publication Date
WO2005110684A1 true WO2005110684A1 (fr) 2005-11-24

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009140728A1 (fr) * 2008-05-21 2009-11-26 Poly Systems Pty Ltd Outil d’entraînement d’attaches

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63174883A (ja) * 1987-01-08 1988-07-19 ポウーアール・トゥールズ・コーポレーション 起爆型インパクト工具
JPS63185586A (ja) * 1987-01-23 1988-08-01 日立工機株式会社 内燃式ピストン駆動装置
JP2001162561A (ja) * 1999-10-19 2001-06-19 Hilti Ag 燃焼力作動装置のピストン駆動方法及び装置
JP2002113671A (ja) * 2000-07-04 2002-04-16 Hilti Ag 携帯可能燃焼力作動作業装置の制御方法及び作業装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63174883A (ja) * 1987-01-08 1988-07-19 ポウーアール・トゥールズ・コーポレーション 起爆型インパクト工具
JPS63185586A (ja) * 1987-01-23 1988-08-01 日立工機株式会社 内燃式ピストン駆動装置
JP2001162561A (ja) * 1999-10-19 2001-06-19 Hilti Ag 燃焼力作動装置のピストン駆動方法及び装置
JP2002113671A (ja) * 2000-07-04 2002-04-16 Hilti Ag 携帯可能燃焼力作動作業装置の制御方法及び作業装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009140728A1 (fr) * 2008-05-21 2009-11-26 Poly Systems Pty Ltd Outil d’entraînement d’attaches
US8550321B2 (en) 2008-05-21 2013-10-08 Poly Systems Pty Ltd Tool for driving fasteners

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