WO2010041599A1 - スパークプラグの製造方法及びスパークプラグの製造装置 - Google Patents
スパークプラグの製造方法及びスパークプラグの製造装置 Download PDFInfo
- Publication number
- WO2010041599A1 WO2010041599A1 PCT/JP2009/067232 JP2009067232W WO2010041599A1 WO 2010041599 A1 WO2010041599 A1 WO 2010041599A1 JP 2009067232 W JP2009067232 W JP 2009067232W WO 2010041599 A1 WO2010041599 A1 WO 2010041599A1
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- ground electrode
- tip
- electrode
- center electrode
- spark plug
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T21/00—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs
- H01T21/06—Adjustment of spark gaps
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
- H01T13/32—Sparking plugs characterised by features of the electrodes or insulation characterised by features of the earthed electrode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T21/00—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs
- H01T21/02—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs of sparking plugs
Definitions
- the present invention relates to a spark plug manufacturing technique used for an internal combustion engine, and more particularly to a spark plug manufacturing method and a manufacturing apparatus characterized by bending of a ground electrode.
- a spark plug for an internal combustion engine such as an automobile engine includes, for example, a central electrode extending in the axial direction, an insulator provided outside the center electrode, a cylindrical metal shell provided outside the insulator, and a base end portion Comprises a ground electrode joined to the tip of the metal shell.
- the ground electrode is disposed so that the tip portion is bent back so as to face the tip portion of the center electrode, and a spark discharge gap is formed between the tip portion of the center electrode and the tip portion of the ground electrode, Fires almost along the axis.
- the spark discharge gap is too large, the required voltage may be increased, and if the spark discharge gap is too small, the flame propagation property may be reduced. Therefore, it is necessary to adjust the spark discharge gap to an appropriate size.
- the bending spacer is disposed so as to face the tip surface of the center electrode, and then the bending contact punching portion in which the contact portion with the ground electrode forms an inclined surface is used.
- Preliminary bending is performed by pressing the ground electrode against the bending spacer, and then, after removing the bending spacer, the ground electrode is bent to a predetermined position using a bending punch having a flat contact surface. It is known (see, for example, Patent Document 1).
- the so-called vertical discharge type spark plug that discharges in a direction substantially along the axial direction as described above, it is possible to adjust the size of the spark discharge gap by using the above technique.
- the so-called transverse discharge type spark plug in which the tip of the ground electrode is disposed so as to face the side surface of the center electrode, or the tip of the ground electrode is the center electrode.
- a so-called oblique discharge type spark plug which is disposed so as to face the front edge portion, has been proposed, and in such a type of spark plug, the spark discharge gap has a size along the axial direction. Not only that, but also the size along the axial direction and the size along the direction perpendicular to the axial line. Therefore, when the above-described technique that can adjust only the size of the spark discharge gap along the axial direction is employed, the size of the spark discharge gap may not be adjusted accurately.
- the spark discharge gap 33 is perpendicular to the axis CL1.
- a method of adjusting the size along the line is conceivable.
- the size of the spark discharge gap 33 along the axis CL1 increases or decreases due to the relative movement of the ground electrode 27 with respect to the center electrode 5, and the spark discharge gap. There is a possibility that the size of 33 cannot be adjusted with sufficient accuracy.
- the above-mentioned problem is not limited to a horizontal discharge type or an oblique discharge type spark plug, but is inherent to a spark plug of a type that discharges in the axial direction.
- the present invention has been made in view of the above circumstances, and an object thereof is to provide a spark plug manufacturing method and a manufacturing apparatus capable of forming a spark discharge gap with sufficient accuracy.
- the manufacturing method of the spark plug of this configuration is as follows: A rod-shaped center electrode extending in the axial direction; A substantially cylindrical insulator having an axial hole extending in the axial direction and having the center electrode provided on a distal end side of the axial hole; A substantially cylindrical metal shell provided on the outer periphery of the insulator; A spark plug manufacturing method comprising a grounding electrode having a base end joined to the metal shell and an intermediate portion bent to form a spark discharge gap between the tip and the tip of the center electrode. , The bending electrode presses the tip of the ground electrode toward the center electrode, thereby bending the ground electrode and along the axial direction of the tip of the ground electrode with respect to the tip of the center electrode.
- a bending step of adjusting the relative height position A gap adjustment step of adjusting the size of the spark discharge gap along the direction perpendicular to the axis using gap adjustment means capable of moving the tip of the ground electrode relative to the center electrode.
- a restricting means for restricting relative movement of the tip end portion of the ground electrode with respect to the center electrode along the axial direction is used.
- tip which consists of noble metal alloys to the front-end
- the noble metal tip constitutes a part of the center electrode and the ground electrode.
- the relative height position of the tip of the ground electrode with respect to the tip of the center electrode that is, the size of the spark discharge gap along the axial direction is adjusted, and the gap adjustment step , The size of the spark discharge gap along the direction orthogonal to the axis is adjusted. For this reason, the spark discharge gap can be formed with high accuracy.
- the size along the axis of the spark discharge gap may be shifted by adjusting the size of the spark discharge gap along the direction perpendicular to the axis.
- the relative movement along the axial direction of the ground electrode can be regulated by the regulating means. For this reason, not only the magnitude
- the spark plug manufacturing method is characterized in that, in the first aspect, the regulating means can adjust a size of the spark discharge gap along the axial direction.
- the regulating means can not only regulate the relative movement of the ground electrode along the axial direction but also adjust the size of the spark discharge gap along the axial line. That is, in the gap adjusting step, the spark discharge gap can be adjusted not only in the direction perpendicular to the axis, but also along the axis, so that the spark discharge gap can be formed with higher accuracy.
- the spark plug manufacturing method of the present configuration is the above-described configuration 1 or 2, wherein the regulating means is configured such that a side surface opposite to the center electrode side of the tip portion of the ground electrode abuts and slides. Restricting the relative movement of the ground electrode with respect to the center electrode; A coating having a smaller coefficient of friction than the ground electrode is formed on a portion of the regulating means where the ground electrode contacts and slides.
- the regulating means regulates the relative movement of the ground electrode with a relatively simple configuration in which the side surface opposite to the center electrode side of the front end portion of the ground electrode contacts and slides. It is good.
- a restricting means if the size along the direction perpendicular to the axis of the spark discharge gap is adjusted by the gap adjusting means, the ground electrode rubs against the restricting means, and the ground electrode is damaged. May be attached.
- a coating having a smaller friction coefficient than that of the ground electrode is formed on the portion of the restricting means where the ground electrode contacts and slides. Therefore, it is possible to effectively prevent the ground electrode from being damaged.
- diamond-like carbon is preferable as the coating having a small friction coefficient.
- the spark plug manufacturing method of this configuration is the above configuration 1 or 2, wherein the regulating means is a rotatable roller, Relative movement along the axial direction of the tip of the ground electrode with respect to the center electrode by bringing the outer peripheral surface of the roller into contact with the side of the tip of the ground electrode opposite to the side of the center electrode It is characterized by restricting.
- the spark plug manufacturing method of this configuration is characterized in that, in the above configuration 1 or 2, the regulating means is configured to be movable in synchronization with the movement of the gap adjusting means.
- the ground electrode can be more reliably rubbed against the regulating means. Can be prevented. Therefore, it is possible to more reliably prevent the surface of the ground electrode from being damaged.
- the spark plug manufacturing method of this configuration is the spark plug according to any one of the above configurations 1 to 5, wherein the spark plug has a shortest distance between the center electrode and the ground electrode such that a tip edge portion of the center electrode or a side surface of the center electrode. And a tip of the ground electrode.
- the shortest distance between the center electrode and the ground electrode is a so-called oblique discharge type plug formed between the tip edge portion of the center electrode and the ground electrode, or the side surface portion of the center electrode
- a so-called lateral discharge type plug formed between the ground electrode and the ground electrode it is important to adjust the size along the direction orthogonal to the axis of the spark discharge gap by the gap adjusting means. Therefore, it is more significant to adopt the above configuration 1 or the like in such a type of plug.
- the spark plug manufacturing apparatus of this configuration is A rod-shaped center electrode extending in the axial direction; A substantially cylindrical insulator having an axial hole extending in the axial direction and having the center electrode provided on a distal end side of the axial hole; A substantially cylindrical metal shell provided on the outer periphery of the insulator; Manufacturing used for manufacturing a spark plug having a grounding electrode having a base end joined to the metal shell and an intermediate portion bent to form a spark discharge gap between the tip and the tip of the center electrode A device, A bending apparatus for adjusting the relative height position along the axial direction of the tip of the ground electrode with respect to the tip of the center electrode by bending the straight rod-shaped ground electrode toward the axis; A gap adjusting device for adjusting the size of the spark discharge gap along the direction perpendicular to the axis, The bending apparatus is A bending means capable of pressing the tip of the ground electrode toward the center electrode; The gap adjusting device includes: A gap adjusting means for moving the tip of the ground electrode relative to the center electrode;
- configuration 1 may be embodied in a spark plug manufacturing apparatus. In this case, basically the same operational effects as those of the configuration 1 are achieved.
- the spark plug manufacturing apparatus of this configuration is the above-described configuration 7,
- the restriction means is capable of adjusting a size of the spark discharge gap along the axial direction.
- the spark plug manufacturing apparatus of the present configuration is the above-described configuration 7 or 8, wherein the regulating means is configured such that a side surface opposite to the center electrode side of the tip portion of the ground electrode is in contact with and slides. Restricting the relative movement of the ground electrode with respect to the center electrode; A coating having a smaller coefficient of friction than the ground electrode is formed on a portion of the regulating means where the ground electrode contacts and slides.
- the spark plug manufacturing apparatus of this configuration is the above configuration 7 or 8, wherein the regulating means is a rotatable roller, Relative movement along the axial direction of the tip of the ground electrode with respect to the center electrode by bringing the outer peripheral surface of the roller into contact with the side of the tip of the ground electrode opposite to the side of the center electrode It is characterized by restricting.
- the spark plug manufacturing apparatus of this configuration is characterized in that, in the above configuration 7 or 8, the regulating means is configured to be movable in synchronization with the movement of the gap adjusting means.
- the spark plug manufacturing apparatus of this configuration is the spark plug manufacturing device according to any one of the above configurations 7 to 11, wherein the spark plug has a shortest distance between the center electrode and the ground electrode such that a tip edge portion of the center electrode or a side surface of the center electrode. And a tip of the ground electrode.
- FIG. 1 is a partially cutaway front view showing a spark plug 1.
- the direction of the axis CL ⁇ b> 1 of the spark plug 1 is the vertical direction in the drawing, the lower side is the front end side of the spark plug 1 and the upper side is the rear end side.
- the spark plug 1 includes an insulator 2 as a cylindrical insulator, a cylindrical metal shell 3 that holds the insulator 2, and the like.
- the insulator 2 is formed by firing alumina or the like, and in its outer portion, a rear end side body portion 10 formed on the rear end side, and a front end than the rear end side body portion 10.
- a large-diameter portion 11 that protrudes outward in the radial direction on the side, and a middle body portion 12 that has a smaller diameter on the tip side than the large-diameter portion 11 are provided.
- the insulator 2 has a leg length portion 13 that is tapered toward the tip end side in the direction of the axis CL ⁇ b> 1 on the tip end side with respect to the middle body portion 12.
- the middle body portion 12 and most of the leg length portions 13 are accommodated in the metal shell 3.
- a tapered step portion 14 is formed at the connecting portion between the leg length portion 13 and the middle trunk portion 12, and the insulator 2 is locked to the metal shell 3 at the step portion 14.
- a shaft hole 4 is formed through the insulator 2 along the axis CL1, and a center electrode 5 is inserted and fixed at the tip side of the shaft hole 4.
- the center electrode 5 has a rod-like shape (cylindrical shape) as a whole, and its tip end surface is formed flat and protrudes from the tip of the insulator 2.
- the center electrode 5 includes an inner layer 5A made of copper or a copper alloy and an outer layer 5B made of a Ni alloy containing nickel (Ni) as a main component.
- a cylindrical noble metal portion 31 made of a noble metal alloy (for example, an iridium alloy) is provided at the tip of the center electrode 5. More specifically, the noble metal portion 31 is provided by forming a melted portion 41 by laser welding or the like on the outer periphery of the contact surface between the outer layer 5B and the noble metal portion 31 (see FIG. 2 and the like).
- a terminal electrode 6 is inserted and fixed on the rear end side of the shaft hole 4 in a state of protruding from the rear end of the insulator 2.
- a cylindrical resistor 7 is disposed between the center electrode 5 and the terminal electrode 6 of the shaft hole 4. Both ends of the resistor 7 are electrically connected to the center electrode 5 and the terminal electrode 6 through conductive glass seal layers 8 and 9, respectively.
- the metal shell 3 is formed in a cylindrical shape from a metal such as low carbon steel, and a screw portion (male screw portion) 15 for attaching the spark plug 1 to the engine head is formed on the outer peripheral surface thereof. Yes.
- a seat portion 16 is formed on the outer peripheral surface on the rear end side of the screw portion 15, and a ring-shaped gasket 18 is fitted on the screw neck 17 on the rear end of the screw portion 15.
- a tool engaging portion 19 having a hexagonal cross section for engaging a tool such as a wrench when the metal shell 3 is attached to the engine head is provided.
- a caulking portion 20 for holding the insulator 2 is provided on the rear end side of the metal shell 3.
- a tapered step portion 21 for locking the insulator 2 is provided on the inner peripheral surface of the metal shell 3.
- the insulator 2 is inserted from the rear end side to the front end side of the metal shell 3, and the rear end of the metal shell 3 is engaged with the step portion 14 of the metal shell 3. It is fixed by caulking the opening on the side radially inward, that is, by forming the caulking portion 20.
- An annular plate packing 22 is interposed between the step portions 14 and 21 of both the insulator 2 and the metal shell 3. Thereby, the airtightness in the combustion chamber is maintained, and the fuel air entering the gap between the leg long portion 13 of the insulator 2 exposed to the combustion chamber and the inner peripheral surface of the metal shell 3 is prevented from leaking outside.
- annular ring members 23 and 24 are interposed between the metal shell 3 and the insulator 2 on the rear end side of the metal shell 3, and the ring member 23 , 24 is filled with powder of talc (talc) 25. That is, the metal shell 3 holds the insulator 2 via the plate packing 22, the ring members 23 and 24, and the talc 25.
- a ground electrode 27 is joined to the distal end surface of the distal end portion 26 of the metal shell 3 by bending its intermediate portion toward the center electrode 5 side.
- the ground electrode 27 has a noble metal tip 32 on the inner peripheral surface of the tip thereof, and the tip edge portion of the noble metal tip 32 and the tip edge portion of the noble metal portion 31 are opposed to each other. That is, the shortest distance between the center electrode 5 (the noble metal portion 31) and the ground electrode 27 (the noble metal tip 32) is formed between the leading edge portion of the noble metal portion 31 and the leading edge portion of the noble metal tip 32.
- a spark discharge gap 33 is formed between the distal end portion of the center electrode 5 and the distal end portion of the ground electrode 27 so that the spark discharge is performed obliquely with respect to the axis CL1.
- the size of the spark discharge gap means a distance along the axial direction between both electrodes.
- the spark plug 1 in the present embodiment performs a spark discharge in an oblique direction as described above, the size of the spark discharge gap 33 is the axis CL1 between the electrodes 5 and 27 as shown in FIG. Is determined by the distance Gx along the direction orthogonal to the distance Gy along the axis CL1 between the electrodes 5 and 27.
- the spark discharge gap 33 it is necessary to accurately adjust not only the distance Gy but also the distance Gx when the ground electrode 27 is bent back to the center electrode 5 side. Then, next, it is used in the process of manufacturing the spark plug 1, which is a feature of the present invention, for bending the ground electrode 27 to the center electrode 5 side and for forming the size of the spark discharge gap 33 to a predetermined size.
- the bending device 51 will be described in detail.
- the bending device 51 includes a bending device 52 including a preliminary bending device 61 and a main bending device 71, and a gap adjusting device 81, as shown in FIG.
- the spark plug 1 is held by a holding means (not shown) such that its tip is upward and the axis CL1 is held along the vertical direction, and is conveyed by a conveyor or the like.
- the pre-bending device 61, the main bending device 71, and the gap adjusting device 81 are conveyed in the order (in the order of arrows in the figure).
- Each of the devices 61, 71, 81 is provided with a positioning device (not shown) for positioning the ground electrode 27 at a certain circumferential position, and the circumferential position of the ground electrode 27 by the positioning device.
- a positioning device (not shown) for positioning the ground electrode 27 at a certain circumferential position, and the circumferential position of the ground electrode 27 by the positioning device.
- the preliminary bending device 61 preliminarily bends a position corresponding to a bent portion (intermediate portion) of the ground electrode 27 with respect to the spark plug 1 (see FIG. 4) including the ground electrode 27 in an unbent state (straight rod shape). That is, the ground electrode 27 is subjected to a preliminary bending process.
- the preliminary bending device 61 includes first deformation preventing means 62 for preventing the ground electrode 27 from falling to the center electrode 5 side and bulging to the opposite side of the center electrode 5, And a roller 63 for bending the ground electrode 27.
- the first deformation preventing means 62 includes a first inner deformation preventing means 62A and a first outer deformation preventing means 62B each having a rod shape extending along the width direction of the ground electrode 27.
- the first inner deformation preventing means 62A and the first outer deformation preventing means 62B are configured to be movable toward and away from the spark plug 1 and when the ground electrode 27 is subjected to a preliminary bending process.
- the first inner deformation preventing means 62A is disposed between the proximal end portion of the ground electrode 27 and the side portion of the center electrode 5, and the first outer deformation preventing means 62B is disposed on the proximal end portion of the ground electrode 27. It arrange
- Both the deformation preventing means 62A and 62B are provided with flat plane portions 64A and 64B.
- the plane portions 64A and 64B face each other while the base portion of the ground electrode 27 is opposed. It arrange
- both the deformation preventing means 62A and 62B are supported by connecting portions (not shown) in the respective base end portions in a state in which the distance between them can be changed.
- the first inner deformation preventing means 62A is configured such that at least a portion of the first inner deformation preventing means 62A that is in contact with the ground electrode 27 has a triangular shape, but the plane portion 64A and the back surface of the plane portion 64A are disposed above.
- a curved curved surface portion 65 is provided at a portion connecting the side surfaces located. The curved surface portion 65 is a portion where the inner surface of the ground electrode 27 is pressed when the ground electrode 27 is pre-bent by the roller 63, and has a shape corresponding to the bent shape of the ground electrode 27.
- the center of curvature CC of the curved surface portion 65 is more than the axis CL1 than the plane PL1 including the tip surface of the center electrode 5 (the noble metal portion 31). It arrange
- the roller 63 has an outer peripheral surface having a predetermined width (for example, 3 mm) and is supported so as to be freely rotatable.
- the roller 63 is configured to be movable in the horizontal direction (in the direction of the arrow in the figure) by a moving means (not shown).
- a moving means not shown
- the roller 63 is opposite to the center electrode 5 of the ground electrode 27. It can be moved and pressed against the side surface.
- a coating (not shown) made of diamond-like carbon (DLC) is formed on a portion of the outer peripheral surface of the roller 63 that can come into contact with the ground electrode 27 and a bearing portion of the roller 63.
- the coefficient of friction on the coating surface is 0.2 or less.
- the main bending device 71 bends the ground electrode 27 subjected to the pre-bending process at a substantially right angle (performs the main bending process), and also connects the ground electrode 27 (the noble metal tip) to the tip of the center electrode 5 (the noble metal part 31). 32) to adjust the relative height position of the tip portion along the direction of the axis CL1.
- the main bending apparatus 71 includes a pressing unit 72 as a bending unit and a second deformation preventing unit 73 for preventing the deformation of the ground electrode 27.
- the pressing means 72 is configured to be movable along the vertical direction (in the direction of the axis line CL1), and the ground electrode 27 is subjected to a main bending process by pushing down the tip of the ground electrode 27 toward the center electrode 5 side. It is for applying.
- the lower surface portion 72A that contacts the ground electrode 27 during the final bending process is formed flat, and a film (not shown) made of DLC is formed on the surface of the lower surface portion 72A. Has been. For this reason, the friction coefficient of the lower surface portion 72A is relatively small.
- the second deformation preventing means 73 includes a second inner deformation preventing means 73A and a second outer deformation preventing means 73B each having a rod shape extending along the width direction of the ground electrode 27. Further, the second inner deformation preventing means 73A and the second outer deformation preventing means 73B are configured to be movable toward and away from the spark plug 1, and when the ground electrode 27 is subjected to a main bending process.
- the second inner deformation preventing means 73A is disposed between the ground electrode 27 and the center electrode 5 so as to come into contact with the inner side surface of the base end portion of the ground electrode 27, and the second outer deformation preventing means 73B is disposed on the ground electrode 27.
- both deformation preventing means 73A and 73B are provided with flat plane portions 74A and 74B, and when the main bending process is performed, the plane portions 74A and 74B face the base end portion of the ground electrode 27. It arrange
- transformation prevention means 73A and 73B are the state which can change both space
- the bending device 71 includes first irradiation means (not shown) for irradiating predetermined light to the distal end portion (at least the distal end portion of the center electrode 5 and the distal end portion of the ground electrode 27) of the spark plug 1.
- 1st imaging means (not shown) which images the front-end
- a control means (not shown) for calculating a pressing amount by the pressing means 72 (corresponding to an amount obtained by adding a springback amount to a displacement amount described later) based on the pressure means and controlling the pressing means 72 based on the pressing amount. It has. Here, it is as follows when the operation
- the control means calculates the amount of deviation in the size along the vertical direction of the gap between the electrodes 5 and 27 with respect to the size along the axis CL1 direction of the spark discharge gap 33 in the design. Then, the grounding electrode 27 is bent by the pressing means 72 by pushing down the grounding electrode 27 by an amount obtained by adding the amount of spring back to the displacement. As a result, the relative height position of the tip portion (noble metal tip 32) of the ground electrode 27 with respect to the tip portion (noble metal portion 31) of the center electrode 5 A spark discharge gap 33 is formed so as to be substantially equal to the relative height position. That is, the spark discharge gap 33 is formed such that the distance Gy along the axis CL1 direction of the spark discharge gap 33 formed between the electrodes 5 and 27 is equal to the design distance Gy.
- the gap adjusting device 81 maintains the distance Gy along the axis CL1 of the spark discharge gap 33 formed by the main bending device 71, while maintaining the distance Gx along the direction orthogonal to the axis CL1 of the spark discharge gap 33. It is for adjustment. As shown in FIG. 7, the gap adjusting device 81 has predetermined light for the second imaging means 82, the gap adjusting means 83, the regulating means 84, the image processing means 85, and the tip end portion of the spark plug 1. 2nd irradiation means (not shown) which irradiates.
- the second imaging means 82 images the tip of the spark plug 1 irradiated with light by the second irradiation means, and outputs the obtained imaging data to the image processing means 85.
- the gap adjusting means 83 moves in the horizontal direction (arrow direction in FIG. 7) the arms 83A, 83B having a rectangular cross section extending along the width direction of the ground electrode 27 and the arms 83A, 83B. It is comprised with the connection part 83C supported in the possible state. Further, the gap adjusting means 83 is configured to be movable in a direction approaching / separating from the conveyed spark plug 1, and when adjusting the distance Gx, the arms 83A, 83B are Approaching the spark plug 1, the ground electrode 27 is held between the arms 83A and 83B. The distance Gx can be adjusted by horizontally moving both arms 83A and 83B.
- the arm 83A is formed to be relatively narrower than the arm 83B, and the arm 83A is disposed on the tip side of the axis CL1 with respect to the plane PL2 including the tip surface of the insulator 2. That is, the arm 83A is disposed between the center electrode 5 and the ground electrode 27 having a relatively large space.
- the regulating means 84 is controlled by the image processing means 85, and its lower surface portion 84A is formed in a flat shape.
- a film (not shown) made of DLC is formed on the lower surface portion 84A, and the friction coefficient of the surface of the film is 0.2 or less.
- the regulating means 84 is configured to be movable along the vertical direction (the direction of the axis line CL1), and at the time of adjusting the distance Gx, the lower surface portion 84A is in a position where it comes into contact with the tip portion of the ground electrode 27. Arranged in a stationary state.
- the image processing unit 85 controls the operations of the gap adjusting unit 83 and the regulating unit 84 based on the image data captured by the second imaging unit 82. More specifically, the image processing means 85 is designed so that the tip of the ground electrode 27 and the tip of the center electrode 5 obtained from the imaging data with respect to the distance Gx along the direction orthogonal to the axis CL1 of the spark discharge gap 33 in the design. The arms 83A and 83B are moved horizontally by an amount obtained by adding a springback amount to the amount of deviation of the distance along the horizontal direction between the portions.
- the distance Gx is adjusted by the gap adjusting means 83 in consideration of the return deformation of the ground electrode 27, and then the gap adjusting means 83 and the regulating means 84 are retracted from the spark plug 1.
- the imaging means 82 captures an image of the spark plug 1 again to check whether the distance Gx and the distance Gy of the spark discharge gap 33 are equal to the designed size.
- the distance Gx and the distance Gy are formed substantially as designed, the bending of the ground electrode 27 is completed.
- the distance Gx or the distance Gy is different from the designed size, the distance Gx is readjusted by the gap adjusting unit 83, and the distance Gy is readjusted by the regulating unit 84.
- the regulating means 84 in the present embodiment not only regulates the relative movement of the tip of the ground electrode 27 with respect to the center electrode 5 along the axis CL1 direction, but also moves the tip of the ground electrode 27 to the center electrode 5 side. , The distance Gx can be adjusted.
- the spark plug 1 (see FIG. 4) on which the ground electrode 27 is positioned is transported to the pre-bending device 61 by the transport means. Then, the first deformation prevention means 62 approaches the spark plug 1 and the base end portion of the ground electrode 27 is supported by the first deformation prevention means 62. Next, when the roller 63 moves to the ground electrode 27 side, the ground electrode 27 is pressed against the curved surface portion 65, and the ground electrode 27 is subjected to a preliminary bending process. Thereafter, the first deformation preventing means 62 and the roller 63 are retracted from the spark plug 1.
- the spark plug 1 subjected to the preliminary bending process is conveyed to the main bending device 71 by the conveying means. Then, the tip of the spark plug 1 irradiated with light by the first irradiation unit is imaged by the first imaging unit, and the pressing amount is calculated by the control unit based on the imaging data.
- the second deformation preventing means 73 approaches the spark plug 1, and the base end portion of the ground electrode 27 is supported by the second deformation preventing means 73. Then, the tip of the ground electrode 27 is pressed by the pressing amount by the pressing means 72, and the ground electrode 27 is subjected to a main bending process.
- the ground electrode 27 is bent at a substantially right angle, and a distance Gy is formed along the axis CL ⁇ b> 1 in the spark discharge gap 33.
- the pressing means 72 and the second deformation preventing means 73 are retracted from the spark plug 1.
- the spark plug 1 subjected to the main bending process is transported to the gap adjusting device 81 by the transport means, and the tip of the spark plug 1 irradiated with light by the second irradiation means is the second portion.
- the image is picked up by the image pickup means 82.
- the image processing unit 85 places the gap adjusting unit 83 and the regulating unit 84 at predetermined positions.
- the distance Gx is adjusted by the gap adjusting means 83 while the distance Gy is maintained by the restricting means 84.
- the gap adjusting means 83 and the regulating means 84 are retracted from the spark plug 1, and the tip of the spark plug 1 is imaged again by the second imaging means 82.
- the distance Gx and the distance Gy are readjusted by the gap adjusting unit 83 and the regulating unit 84 based on the re-acquired imaging data.
- the spark discharge gap 33 is formed in a predetermined (substantially designed) size, and the bending of the ground electrode 27 is completed.
- the bending device 51 of the present embodiment in the bending device 52, the relative height position of the tip of the ground electrode 27 with respect to the tip of the center electrode 5, that is, the spark discharge gap 33.
- the size along the direction of the axis CL1 is adjusted, and the gap adjusting device 81 adjusts the size of the spark discharge gap 33 along the direction orthogonal to the axis CL1. For this reason, the spark discharge gap 33 can be formed with high accuracy.
- the gap adjusting device 81 adjusts the size of the spark discharge gap 33 along the direction perpendicular to the axis CL1 to cause a deviation in the size of the spark discharge gap 33 along the axis CL1.
- the restriction means 84 can restrict the relative movement of the ground electrode 27 along the direction of the axis CL1. For this reason, it is possible to more surely prevent the spark discharge gap 33 adjusted in the bending device 52 from being shifted in size along the axis CL1, and the spark discharge gap 33 is formed with sufficient accuracy. be able to.
- the regulating means 84 can not only regulate the relative movement of the ground electrode 27 along the axis CL1 but also adjust the size of the spark discharge gap 33 along the axis CL1. For this reason, since the gap adjusting device 81 can adjust not only the size of the spark discharge gap 33 in the direction orthogonal to the axis CL1 but also the size along the axis CL1, the spark discharge gap 33 can be formed more accurately. can do.
- a coating made of diamond-like carbon is formed on the contact portion with the ground electrode 27 in the restricting means 84, and the friction coefficient of the contact portion with the ground electrode 27 is relatively small. . Thereby, it is possible to effectively prevent the ground electrode 27 from being damaged by the restricting means 84.
- the means (curved surface portion 65) for applying a curved surface is provided between the base end portion of the ground electrode 27 and the side portion of the center electrode 5 during the preliminary bending process. Placed in. That is, since the curved surface portion 65 serving as a reference for the bending position of the ground electrode 27 is arranged on the more proximal side (in a position closer to the metal shell 3) without being obstructed by the center electrode 5, The ground electrode 27 can be bent relatively easily on the base end side. Therefore, it is particularly significant to use the pre-bending device 61 in the present embodiment in a so-called oblique discharge type plug or lateral discharge type plug in which the ground electrode 27 needs to be bent more proximally.
- the ground electrode 27 is subjected to a pre-bending process by a roller 63 that can move relative to the ground electrode 27 along a direction substantially orthogonal to the axis CL1 and is supported so as to be freely rotatable. For this reason, the ground electrode 27 can be more reliably pressed against the curved surface portion 65 without changing the pressing direction of the ground electrode 27. Further, since the roller 63 is supported so as to be freely rotatable, a situation in which the ground electrode 27 is bent while rubbing against the roller 63 can be suppressed as much as possible, and the ground electrode 27 can be more easily damaged. It can be surely prevented.
- the outer peripheral surface of the roller 63 and the bearing portion have DLC.
- a coating consisting of is provided.
- the curved surface portion 65 disposed between the ground electrode 27 and the center electrode 5 and the like and the first inner deformation preventing means 62A are integrated. For this reason, complication of the apparatus can be prevented.
- the curved surface portion 65 is arranged such that the center of curvature CC of the curved surface portion 65 is positioned on the proximal side in the direction of the axis line CL1 with respect to the flat surface PL1 including the distal end surface of the center electrode 5. Therefore, the ground electrode 27 can be further bent at the base end side, and a transverse discharge type or oblique discharge type plug can be manufactured relatively easily.
- the arm 83A is disposed on the tip side in the direction of the axis CL1 with respect to the plane PL2 including the tip surface of the insulator 2, that is, between the center electrode 5 and the ground electrode 27 having a relatively large space. Therefore, it is possible to suppress the relative movement of the ground electrode 27 toward the center electrode 5 due to the presence of the arm 83A, and to adjust the size of the spark discharge gap 33 more easily and more accurately. Can do.
- the first deformation preventing means 62 includes the first inner deformation preventing means 62A and the first outer deformation preventing means 62B, but the first inner deformation preventing means 62A and the first outer deformation preventing means 62B. Only one of the means 62B may be provided.
- the roller 63 is used as the first bending means for performing the pre-bending process on the ground electrode 27.
- the means for performing the pre-bending process on the ground electrode 27 is limited to this. Is not to be done.
- the coating made of DLC is provided on the outer peripheral surface of the roller 63, the lower surface portion 84A of the restricting means 84, etc., but the coating may not be provided.
- the spark plug 1 is an oblique discharge type that discharges sparks obliquely with respect to the direction of the axis CL1, but the discharge direction of the spark plug 1 is not limited to this. Therefore, a horizontal discharge type that discharges a spark along a direction substantially orthogonal to the direction of the axis CL1 or a vertical discharge type that discharges a spark along the direction of the axis CL1 may be used. .
- the ground electrode 27 is joined to the distal end surface of the distal end portion 26 of the metal shell 3 .
- the present invention can also be applied to the case where the ground electrode is formed by cutting out a part of a certain tip metal fitting (for example, Japanese Patent Application Laid-Open No. 2006-236906).
- the ground electrode 27 may be joined to the side surface of the distal end portion 26 of the metal shell 3.
- the tool engaging portion 19 has a hexagonal cross section, but the shape of the tool engaging portion 19 is not limited to such a shape.
- it may be a Bi-HEX (deformed 12-angle) shape [ISO 22777: 2005 (E)].
- the arrangement positions of the first inner deformation preventing means 62A and the first outer deformation preventing means 62B during the pre-bending process may be determined based on the imaging data of the tip portion of the spark plug 1.
- the first inner deformation preventing means 62A and the first outer deformation preventing means 62B, the second inner deformation preventing means 73A and the second outer deformation preventing means 73B, the arm 83A and the arm 83B are separate members. Although comprised, you may comprise by a single member.
- the gap adjusting means 83 sandwiches the proximal end portion of the ground electrode 27.
- the tip surface of the ground electrode 27 (having the noble metal tip 32 is provided). In such a case, the tip of the ground electrode base material excluding the noble metal tip 32 may be pressed.
- the distance Gx is set by the gap adjusting unit 83 while maintaining the distance Gy by bringing the tip of the ground electrode 27 into contact with the lower surface 84A of the regulating unit 84 having a relatively low friction coefficient. It has been adjusted. That is, when the distance Gx is adjusted, the surface of the ground electrode 27 is rubbed against the lower surface portion 84A of the regulating means 84.
- the restricting means 94 may be configured by a roller that can freely rotate or can be rotated in accordance with the movement of the ground electrode 27.
- the regulating means 104 may be configured to be movable in synchronization with the movement of the gap adjusting means 83. In this case, when adjusting the distance Gx, it is possible to more reliably prevent the friction between the regulating means 94 and 104 and the ground electrode 27 from occurring. Therefore, it is possible to more reliably prevent the surface of the ground electrode 27 from being damaged.
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Abstract
Description
軸線方向に延びる棒状の中心電極と、
前記軸線方向に延びる軸孔を有するとともに、前記中心電極が前記軸孔の先端側に設けられた略円筒状の絶縁体と、
前記絶縁体の外周に設けられた略円筒状の主体金具と、
基端部が前記主体金具に接合され、中間部が曲げられて先端部と前記中心電極の先端部との間に火花放電間隙を形成する接地電極とを備えたスパークプラグの製造方法であって、
曲げ手段によって、前記接地電極の先端部を前記中心電極側へと押圧することで、前記接地電極を屈曲させるとともに、前記中心電極の先端部に対する前記接地電極の先端部の前記軸線方向に沿った相対高さ位置を調整する曲げ工程と、
前記接地電極の先端部を前記中心電極に対して相対移動可能な間隙調整手段を用いて、前記火花放電間隙のうち前記軸線と直交する向きに沿った大きさを調整する間隙調整工程とを含み、
前記間隙調整工程において、前記中心電極に対する前記接地電極の先端部の前記軸線方向に沿った相対移動を規制するための規制手段を用いることを特徴とする。
上記構成2によれば、規制手段によって、接地電極の軸線方向に沿った相対移動を規制することができるだけでなく、火花放電間隙の軸線に沿った大きさの調整を行うことができる。すなわち、間隙調整工程において、火花放電間隙のうち軸線と直交する方向の大きさに加え、軸線に沿った大きさをも調整できるため、火花放電間隙をより一層精度よく形成することができる。
前記規制手段のうち、前記接地電極が当接及び摺動する部分には前記接地電極よりも摩擦係数の小さい被膜が形成されることを特徴とする。
前記接地電極の先端部のうち前記中心電極側とは反対側の側面に前記ローラの外周面を当接させることで、前記中心電極に対する前記接地電極の先端部の前記軸線方向に沿った相対移動を規制することを特徴とする。
軸線方向に延びる棒状の中心電極と、
前記軸線方向に延びる軸孔を有するとともに、前記中心電極が前記軸孔の先端側に設けられた略円筒状の絶縁体と、
前記絶縁体の外周に設けられた略円筒状の主体金具と、
基端部が前記主体金具に接合され、中間部が曲げられて先端部と前記中心電極の先端部との間に火花放電間隙を形成する接地電極とを備えたスパークプラグの製造に用いられる製造装置であって、
直棒状の前記接地電極を前記軸線に向けて曲げて前記中心電極の先端部に対する前記接地電極の先端部の前記軸線方向に沿った相対高さ位置を調整するための曲げ装置と、
前記火花放電間隙のうち前記軸線と直交する向きに沿った大きさを調整するための間隙調整装置とを備え、
前記曲げ装置は、
前記接地電極の先端部を前記中心電極側に押圧可能な曲げ手段を有し、
前記間隙調整装置は、
前記軸線と略直交する向きに沿って前記接地電極の先端部を前記中心電極に対して相対移動させる間隙調整手段と、
前記中心電極に対する前記接地電極の先端部の前記軸線方向に沿った相対移動を規制するための規制手段とを有することを特徴とする。
前記規制手段は、前記火花放電間隙のうち前記軸線方向に沿った大きさを調整可能であることを特徴とする。
前記規制手段のうち、前記接地電極が当接及び摺動する部分には前記接地電極よりも摩擦係数の小さい被膜が形成されることを特徴とする。
前記接地電極の先端部のうち前記中心電極側とは反対側の側面に前記ローラの外周面を当接させることで、前記中心電極に対する前記接地電極の先端部の前記軸線方向に沿った相対移動を規制することを特徴とする。
Claims (12)
- 軸線方向に延びる棒状の中心電極と、
前記軸線方向に延びる軸孔を有するとともに、前記中心電極が前記軸孔の先端側に設けられた略円筒状の絶縁体と、
前記絶縁体の外周に設けられた略円筒状の主体金具と、
基端部が前記主体金具に接合され、中間部が曲げられて先端部と前記中心電極の先端部との間に火花放電間隙を形成する接地電極とを備えたスパークプラグの製造方法であって、
曲げ手段によって、前記接地電極の先端部を前記中心電極側へと押圧することで、前記接地電極を屈曲させるとともに、前記中心電極の先端部に対する前記接地電極の先端部の前記軸線方向に沿った相対高さ位置を調整する曲げ工程と、
前記接地電極の先端部を前記中心電極に対して相対移動可能な間隙調整手段を用いて、前記火花放電間隙のうち前記軸線と直交する向きに沿った大きさを調整する間隙調整工程とを含み、
前記間隙調整工程において、前記中心電極に対する前記接地電極の先端部の前記軸線方向に沿った相対移動を規制するための規制手段を用いることを特徴とするスパークプラグの製造方法。 - 前記規制手段は、前記火花放電間隙のうち前記軸線方向に沿った大きさを調整可能であることを特徴とする請求項1に記載のスパークプラグの製造方法。
- 前記規制手段は、前記接地電極の先端部のうち前記中心電極側とは反対側の側面が当接及び摺動することで、前記中心電極に対する前記接地電極の相対移動を規制し、
前記規制手段のうち、前記接地電極が当接及び摺動する部分には前記接地電極よりも摩擦係数の小さい被膜が形成されることを特徴とする請求項1又は2に記載のスパークプラグの製造方法。 - 前記規制手段は、回転可能なローラであり、
前記接地電極の先端部のうち前記中心電極側とは反対側の側面に前記ローラの外周面を当接させることで、前記中心電極に対する前記接地電極の先端部の前記軸線方向に沿った相対移動を規制することを特徴とする請求項1又は2に記載のスパークプラグの製造方法。 - 前記規制手段は、前記間隙調整手段の移動に同期して移動可能に構成されることを特徴とする請求項1又は2に記載のスパークプラグの製造方法。
- 前記スパークプラグは、前記中心電極及び前記接地電極の最短距離が、前記中心電極の先端エッジ部分又は前記中心電極の側面部と、前記接地電極の先端部との間で形成されることを特徴とする請求項1乃至5のいずれか1項に記載のスパークプラグの製造方法。
- 軸線方向に延びる棒状の中心電極と、
前記軸線方向に延びる軸孔を有するとともに、前記中心電極が前記軸孔の先端側に設けられた略円筒状の絶縁体と、
前記絶縁体の外周に設けられた略円筒状の主体金具と、
基端部が前記主体金具に接合され、中間部が曲げられて先端部と前記中心電極の先端部との間に火花放電間隙を形成する接地電極とを備えたスパークプラグの製造に用いられる製造装置であって、
直棒状の前記接地電極を前記軸線に向けて曲げて前記中心電極の先端部に対する前記接地電極の先端部の前記軸線方向に沿った相対高さ位置を調整するための曲げ装置と、
前記火花放電間隙のうち前記軸線と直交する向きに沿った大きさを調整するための間隙調整装置とを備え、
前記曲げ装置は、
前記接地電極の先端部を前記中心電極側に押圧可能な曲げ手段を有し、
前記間隙調整装置は、
前記軸線と略直交する向きに沿って前記接地電極の先端部を前記中心電極に対して相対移動させる間隙調整手段と、
前記中心電極に対する前記接地電極の先端部の前記軸線方向に沿った相対移動を規制するための規制手段とを有することを特徴とするスパークプラグの製造装置。 - 前記規制手段は、前記火花放電間隙のうち前記軸線方向に沿った大きさを調整可能であることを特徴とする請求項7に記載のスパークプラグの製造装置。
- 前記規制手段は、前記接地電極の先端部のうち前記中心電極側とは反対側の側面が当接及び摺動することで、前記中心電極に対する前記接地電極の相対移動を規制し、
前記規制手段のうち、前記接地電極が当接及び摺動する部分には前記接地電極よりも摩擦係数の小さい被膜が形成されることを特徴とする請求項7又は8に記載のスパークプラグの製造装置。 - 前記規制手段は、回転可能なローラであり、
前記接地電極の先端部のうち前記中心電極側とは反対側の側面に前記ローラの外周面を当接させることで、前記中心電極に対する前記接地電極の先端部の前記軸線方向に沿った相対移動を規制することを特徴とする請求項7又は8に記載のスパークプラグの製造装置。 - 前記規制手段は、前記間隙調整手段の移動に同期して移動可能に構成されることを特徴とする請求項7又は8に記載のスパークプラグの製造装置。
- 前記スパークプラグは、前記中心電極及び前記接地電極の最短距離が、前記中心電極の先端エッジ部分又は前記中心電極の側面部と、前記接地電極の先端部との間で形成されることを特徴とする請求項7乃至11のいずれか1項に記載のスパークプラグの製造装置。
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US13/120,557 US8371889B2 (en) | 2008-10-06 | 2009-10-02 | Spark plug manufacturing method and spark plug manufacturing apparatus |
JP2010515142A JP5325214B2 (ja) | 2008-10-06 | 2009-10-02 | スパークプラグの製造方法及びスパークプラグの製造装置 |
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EP2333917B1 (en) | 2017-05-31 |
CN102171900B (zh) | 2013-09-18 |
KR20110081969A (ko) | 2011-07-15 |
US8371889B2 (en) | 2013-02-12 |
EP2333917A4 (en) | 2014-01-22 |
JPWO2010041599A1 (ja) | 2012-03-08 |
US20110171870A1 (en) | 2011-07-14 |
EP2333917A1 (en) | 2011-06-15 |
CN102171900A (zh) | 2011-08-31 |
JP5325214B2 (ja) | 2013-10-23 |
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