WO2012070409A1 - スパークプラグの製造方法及び製造装置 - Google Patents
スパークプラグの製造方法及び製造装置 Download PDFInfo
- Publication number
- WO2012070409A1 WO2012070409A1 PCT/JP2011/076053 JP2011076053W WO2012070409A1 WO 2012070409 A1 WO2012070409 A1 WO 2012070409A1 JP 2011076053 W JP2011076053 W JP 2011076053W WO 2012070409 A1 WO2012070409 A1 WO 2012070409A1
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- WIPO (PCT)
- Prior art keywords
- insulator
- cradle
- metal shell
- talc
- spark plug
- Prior art date
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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
-
- 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
- H01T13/36—Sparking plugs characterised by features of the electrodes or insulation characterised by the joint between insulation and body, e.g. using cement
Definitions
- the present invention relates to a method and apparatus for manufacturing a spark plug used for an internal combustion engine or the like.
- the spark plug is attached to an internal combustion engine (engine), for example, and is used for ignition of the air-fuel mixture in the combustion chamber.
- engine an internal combustion engine
- a spark plug is provided at the tip of a metal shell, a cylindrical insulator extending in the axial direction, a central electrode inserted into the insulator, a metal shell provided on the outer periphery of the insulator, And a ground electrode that forms a spark discharge gap with the center electrode.
- the metal shell and the insulator are inserted into the metal shell, and a load along the axial direction is applied to the rear end opening of the metal shell by a predetermined mold to The opening is fixed by bending inward in the radial direction (that is, through a caulking step).
- Patent Document 1 a technique for providing a talc between the metal shell and the insulator is known (see, for example, Patent Document 1).
- the talc press jig is moved downward along the axial direction, and the talc is pressed by the tip of the talc press jig. It is done.
- the axis of the insulator is shifted or tilted with respect to the central axis of the cradle (ie, the central axis of the metal shell) There is.
- an excessive stress is applied to the insulator and the insulator is broken (cracked), or the center electrode held by the insulator is misaligned due to the misalignment of the insulator.
- an abnormal spark discharge such as a side fire is likely to occur between the center electrode and the metal shell.
- the spark plug in which the distance along the radial direction between the center electrode and the metal shell is set to be relatively small, even if the axis deviation and inclination are slight, There is concern about the occurrence of abnormal spark discharge.
- the axial deviation between the central axis of the metal shell and the axis of the insulator is also caused when a load along the axial direction is applied to the rear end side opening of the metal shell in the caulking process described above. It can occur as well.
- the present invention has been made in view of the above circumstances, and its purpose is to reduce the eccentricity in the radial direction between the central axis of the press jig and the axis of the insulator in the talc pressing process and the caulking process. Therefore, it is an object of the present invention to provide a spark plug manufacturing method and manufacturing apparatus capable of effectively suppressing an axial deviation or the like between the axis of the insulator and the central axis of the metal shell.
- a manufacturing method of the spark plug of this configuration includes a cylindrical insulator extending in the axial direction, A cylindrical metal shell provided on the outer periphery of the insulator; A spark plug manufacturing method comprising a talc filled between the insulator and the metal shell, Including a talc pressing step of pressing the talc along the axial direction by a cylindrical talc press jig after supporting the metal shell through which the insulator is inserted by a cylindrical cradle; The cradle is movable relative to the talc press jig along its radial direction at least when the talc is pressed by the talc press jig.
- the talc pressing step includes an eccentricity adjusting step of reducing an eccentricity in a radial direction between a central axis of the talc press jig and an axis of the insulator.
- the cradle can be moved relative to the talc press jig along its radial direction at least when the talc is pressed by the talc press jig. Therefore, when the talc is pressed, even if there is a slight misalignment between the center axis of the talc press jig and the axis of the insulator, the center of the talc press jig is moved by the relative movement of the cradle.
- the shaft and the axis of the insulator are accurately aligned (that is, the eccentricity in the radial direction between the central axis of the talc press jig and the axis of the insulator is small).
- the spark plug manufacturing method of this configuration is the above-described configuration 1, wherein the cradle is supported by a plurality of elastic members provided between the cradle and the stationary base disposed on the outer peripheral side. And An annular gap is formed between the outer peripheral surface of the cradle and the inner peripheral surface of the fixed base, and the cradle is movable relative to the fixed base along its own radial direction. It is characterized by that.
- the annular gap is formed between the outer peripheral surface of the cradle and the inner peripheral surface of the fixed base, and the cradle moves relative to the fixed base along its own radial direction. It is possible. Therefore, the same operation effect as the said structure 1 will be show
- the cradle and the fixed base are basically arranged in the same relative positional relationship unless an external force is applied. That is, even if the cradle moves relative to the fixed base when the talc is pressed, the cradle returns to the original position after the talc is pressed. Therefore, it is possible to more reliably prevent the influence of the alignment of the central axis of the talc press jig and the axis of the insulator when pressing the talc from affecting the subsequent talc pressing process.
- the insulator and the insulator are formed by a caulking portion that is bent inward in a radial direction provided at a rear end portion of the metal shell.
- the metal shell is fixed,
- the talc pressing step including a caulking step of pressing the rear end of the metal shell along the axial direction with a cylindrical metal fitting pressing jig to form the caulking portion,
- the caulking step at least when the metal shell is pressed by the metal fitting pressing jig, the insulator is moved by the cradle that is movable relative to the metal fitting pressing jig along its radial direction.
- the caulking portion is formed by the metal fitting pressing jig after supporting the inserted metal shell.
- the cradle can be moved relative to the metal fitting jig along the radial direction of the metal fitting, so that when the metal fitting is pressed by the metal fitting pressing jig, the metal fitting pressing jig is used. Therefore, the center axis of the insulator and the axis of the insulator are accurately matched. Therefore, when forming the caulking portion, the radially inward force applied to the outer peripheral surface of the metal shell is evenly applied along the circumferential direction of the metal shell.
- the above configuration 1 and the like exhibit the effect of suppressing the axial deviation and the like between the axis of the insulator and the central axis of the metal shell, and adopt the above configuration 4 to further suppress the axial deviation and the like.
- the effect of preventing breakage of the insulator, which is a concern by adopting the above configuration 4 is also exhibited.
- holding the cradle is not only for holding the cradle in an unmovable state even when an external force is applied, but to the extent that the movement of the cradle can be suppressed unless a large external force is applied. This includes the case of holding the cradle (becomes movable when a large external force is applied) (hereinafter the same). Therefore, it is good also as holding a receiving stand by an elastic member like the said structure 2.
- the cradle can be relatively moved along the radial direction at least when the talc is pressed by the talc press jig in terms of suppressing the axial deviation between the axis of the insulator and the central axis of the metal shell. It is preferable to do.
- the talc press jig approaches the talc side, if the cradle is freely movable, the axis of the insulator is moved with respect to the central axis of the talc press jig as the cradle moves. It can occur that it deviates greatly. In this case, the front end surface of the talc press jig may collide with the insulator and the terminal electrode exposed from the rear end of the insulator, which may cause damage to the insulator and the terminal electrode.
- the cradle is held until at least a part of the insulator enters the inner periphery of the talc press jig, so that the cradle cannot move freely. It is configured. Therefore, it is possible to more reliably prevent a situation in which the axis of the insulator greatly deviates from the central axis of the talc press jig, and to prevent the talc press jig from colliding with the insulator and the terminal electrode. it can. As a result, damage to the insulator and the terminal electrode can be prevented more reliably.
- a manufacturing method of the spark plug of this configuration includes a cylindrical insulator extending in the axial direction, A cylindrical metal shell provided on the outer periphery of the insulator; A method of manufacturing a spark plug in which the insulator and the metal shell are fixed by a caulking portion that is bent radially inward provided at a rear end portion of the metal shell, After supporting the metal shell through which the insulator is inserted by a cylindrical cradle, the rear end portion of the metal shell is pressed along the axial direction by a cylindrical metal pressing jig, and the caulking is performed Including a caulking step to form a part, The cradle is movable relative to the metal fitting pressing jig along its radial direction at least when the metal fitting is pressed by the metal fitting pressing jig.
- the caulking step includes an eccentricity adjusting step for reducing the eccentricity in the radial direction between the central axis of the metal fitting pressing jig and the axis of the
- the spark plug manufacturing method of this configuration is the above configuration 6, wherein the receiving base is supported by a plurality of elastic members provided between the fixing base and the fixing base arranged on the outer peripheral side. And An annular gap is formed between the outer peripheral surface of the cradle and the inner peripheral surface of the fixed base, and the cradle is movable relative to the fixed base along its own radial direction. It is characterized by that.
- annular clearance gap is formed between the outer peripheral surface of a receiving stand, and the inner peripheral surface of a fixed base, A relative movement with respect to a fixed base is carried out along its own radial direction. It is possible. Therefore, the same effect as the said structure 6 is show
- the cradle and the fixed base are basically arranged in the same relative positional relationship unless an external force is applied. That is, even when the cradle moves relative to the fixed base when the metal shell is pressed, the cradle returns to the original position after the metal shell is pressed. Therefore, it is possible to more reliably prevent the influence of the axial alignment between the central axis of the metal fitting pressing jig and the insulator axis when pressing the metal shell from affecting the subsequent caulking process.
- Configuration 8 In the method for manufacturing a spark plug of this configuration, in the configuration 3 or 6, the tip portion of the insulator is held in the caulking step, and the radial direction of the tip portion of the insulator with respect to the cradle is aligned. Relative movement is restricted.
- the spark plug manufacturing method according to this configuration is the above-described configuration 3, 5 or 7, wherein, in the caulking step, the receiving member is inserted until at least a part of the insulator enters the inner periphery of the metal fitting pressing jig. It is characterized by holding a stand.
- the collision of the metal fitting pressing jig with the insulator and the terminal electrode can be more reliably prevented, and damage to the insulator and the terminal electrode can be more reliably prevented.
- the spark plug manufacturing apparatus of the present configuration includes a cylindrical insulator extending in the axial direction, A cylindrical metal shell provided on the outer periphery of the insulator; A spark plug manufacturing apparatus comprising a talc filled between the insulator and the metal shell, A cylindrical cradle for supporting the metal shell; A cylindrical talc press jig movable along the axial direction, After supporting the metal shell through which the insulator has been inserted by the cradle, pressing the talc by moving the talc press jig, The cradle can be moved relative to the talc press jig along its radial direction at least when the talc is pressed by the talc press jig.
- the spark plug manufacturing apparatus of this configuration is the above-described configuration 10, wherein the fixed base disposed on the outer peripheral side of the cradle; A plurality of elastic members provided between the cradle and the fixed base; An annular gap is formed between the outer peripheral surface of the cradle and the inner peripheral surface of the fixed base, and the cradle is movable relative to the fixed base along its own radial direction. It is characterized by that.
- the spark plug manufacturing apparatus of this configuration is the above configuration 10 or 11, wherein the talc press jig is moved until at least a part of the insulator enters the inner periphery of the talc press jig. It is characterized by holding a cradle.
- the spark plug manufacturing apparatus is the spark plug manufacturing apparatus according to any one of the above configurations 10 to 12, wherein in the spark plug, the insulation is provided by a caulking portion that is bent inward in a radial direction and is provided at a rear end portion of the metal shell.
- the body and the metal shell are fixed, A cylindrical metal fitting pressing jig that is movable along the axial direction, After supporting the metal shell through which the insulator is inserted by the cradle, the metal press jig is moved to press the rear end portion of the metal shell, thereby forming the crimped portion, The cradle can be moved relative to the metal fitting pressing jig along its radial direction at least when the metal fitting is pressed by the metal fitting pressing jig.
- the spark plug manufacturing apparatus of the present configuration includes a cylindrical insulator extending in the axial direction, A cylindrical metal shell provided on the outer periphery of the insulator; A spark plug manufacturing apparatus in which the insulator and the metal shell are fixed by a caulking portion that is bent radially inward provided at a rear end portion of the metal shell, A cylindrical cradle for supporting the metal shell; A cylindrical metal fitting pressing jig movable along the axial direction, After supporting the metal shell through which the insulator is inserted by the cradle, the metal press jig is moved to press the rear end portion of the metal shell, thereby forming the crimped portion, The cradle can be moved relative to the metal fitting pressing jig along its radial direction at least when the metal fitting is pressed by the metal fitting pressing jig.
- the spark plug manufacturing apparatus of this configuration is the above-described configuration 14, wherein the fixed base disposed on the outer peripheral side of the cradle, A plurality of elastic members provided between the cradle and the fixed base; An annular gap is formed between the outer peripheral surface of the cradle and the inner peripheral surface of the fixed base, and the cradle is movable relative to the fixed base along its own radial direction. It is characterized by that.
- the spark plug manufacturing apparatus of this configuration is the above configuration 14 or 15, wherein at least a part of the insulator enters the inner periphery of the metal press jig when the metal press jig is moved. It is characterized by holding a cradle.
- the spark plug manufacturing apparatus in any one of the above configurations 10 to 16, holds the tip portion of the insulator and restricts relative movement along the radial direction of the tip portion of the insulator with respect to the cradle.
- An insulator guide is provided.
- (A) is a partially broken front view for explaining a configuration of a cradle and a holding device used in a caulking process in another embodiment, and (b) is a cross-sectional view of FIG. It is J sectional drawing.
- (A) is the partially broken front view for demonstrating one process of the talc pressing process in another embodiment,
- (b) is the JJ sectional view taken on the line of FIG. 15 (a).
- (A) is the partially broken front view for demonstrating one process of the crimping process in another embodiment, (b) is the JJ sectional view taken on the line of FIG. 16 (a).
- it is a partially broken front view for demonstrating the structure of the cradle and holding
- it is a partially broken front view for demonstrating the structure of the receiving stand and holding
- 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 radially outward on the side, a middle body portion 12 that is smaller in diameter than the large-diameter portion 11, and a tip portion that is more distal than the middle body portion 12.
- the leg length part 13 formed in diameter smaller than this on the side is provided.
- the large diameter portion 11, the middle trunk portion 12, and most of the leg long portions 13 are accommodated inside the metal shell 3.
- a tapered step portion 14 is formed at the connecting portion between the middle body portion 12 and the long leg portion 13, and the insulator 2 is locked to the metal shell 3 at the step portion 14.
- the insulator 2 is formed with a shaft hole 4 extending along the axis CL 1, and a center electrode 5 is inserted and fixed at the tip side of the shaft hole 4.
- 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.
- the center electrode 5 has a rod shape (cylindrical shape) as a whole, and a tip portion of the center electrode 5 projects from the tip of the insulator 2.
- 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 for attaching the spark plug 1 to a combustion device such as an internal combustion engine or a fuel cell reformer on the outer peripheral surface thereof.
- a portion (male screw portion) 15 is formed.
- a seat portion 16 is formed on the rear end side of the screw portion 15 so as to protrude toward the outer peripheral side, and a ring-shaped gasket 18 is fitted into the screw neck 17 at 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 combustion device is provided on the rear end side of the metal shell 3.
- a caulking portion 20 that bends inward in the radial direction is provided at the rear end portion of the metal shell 3.
- the metal shell 3 in order to reduce the diameter of the spark plug 1, the metal shell 3 is reduced in diameter, and the screw diameter of the screw portion 15 is relatively small (for example, M12 or less). Therefore, the distance L along the direction orthogonal to the axis CL1 between the inner peripheral surface of the front end of the metal shell 3 and the front end of the insulator 2 is relatively small (for example, 1.0 mm or less), The distance between the tip of the metal shell 3 and the tip of the center electrode 5 is relatively small.
- 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 to the metal shell 3 by caulking the opening on the side inward in the radial direction, 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 gas 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 talc 25 powder. 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 substantially intermediate portion is bent back at the tip portion 26 of the metal shell 3, and a ground electrode 27 having a tip side surface facing the tip portion of the center electrode 5 is joined.
- a spark discharge gap 28 is formed between the tip of the center electrode 5 and the tip of the ground electrode 27, and spark discharge is performed in the spark discharge gap 28 in a direction substantially along the axis CL1. It has become.
- the metal shell 3 is processed in advance. That is, a rough shape is formed on a cylindrical metal material (for example, an iron-based material or a stainless steel material) by cold forging or the like, and a through hole is formed. Thereafter, the outer shape is adjusted by cutting to obtain a metal shell intermediate.
- a cylindrical metal material for example, an iron-based material or a stainless steel material
- a straight rod-shaped ground electrode 27 made of an Ni alloy is resistance-welded to the front end surface of the metal shell intermediate.
- so-called “sag” is generated.
- the threaded portion 15 is formed by rolling at a predetermined portion of the metal shell intermediate body.
- the rear end portion of the obtained metal shell 3 has a cylindrical shape (that is, the caulking portion 20 is not formed), and a thin wall between the seat portion 16 and the tool engaging portion 19.
- the part is also cylindrical.
- the metal shell 3 to which the ground electrode 27 is welded is subjected to zinc plating or nickel plating.
- the surface may be further subjected to chromate treatment.
- the insulator 2 is molded separately from the metal shell 3.
- a raw material powder mainly composed of alumina and containing a binder or the like a green compact for molding is prepared, and a rubber-molded product is used to form a cylindrical molded body. Is obtained.
- the obtained molded body is ground and shaped, and the shaped product is fired in a firing furnace, whereby the insulator 2 is obtained.
- the center electrode 5 is manufactured separately from the metal shell 3 and the insulator 2. That is, the center electrode 5 is produced by forging a Ni alloy in which a copper alloy or the like for improving heat dissipation is arranged at the center.
- the glass seal layers 8 and 9 are generally prepared by mixing borosilicate glass and metal powder and injected into the shaft hole 4 of the insulator 2 with the resistor 7 interposed therebetween, and then from the rear. While being pressed by the terminal electrode 6, it is fired by being heated in a firing furnace. At this time, the glaze layer may be fired simultaneously on the surface of the rear end side body portion 10 of the insulator 2 or the glaze layer may be formed in advance.
- the insulator 2 and the metal shell 3 respectively manufactured as described above are fixed through a talc pressing process and a caulking process.
- the insulator 2 is inserted into the metal shell 3, and the axis CL1 extends substantially along the vertical direction by a metal-made cradle 31.
- the metallic shell 3 is supported.
- the metal shell 3 is arranged such that its central axis coincides with the central axis of the cradle 31.
- a cylindrical fixed base 32 is disposed on the outer peripheral side of the receiving base 31, and the fixed base 32 is transportable along a predetermined transport direction. Attached to the base 33.
- annular gap 34 is provided between the outer peripheral surface of the cradle 31 and the inner peripheral surface of the fixed base 32, and the cradle 31 is relative to the fixed base 32 along its own radial direction. Relative movement is possible.
- the receiving base 31 is supported by a plurality of elastic members 35 provided between the fixing base 32 and the fixing base 32.
- the elastic member 35 is a spring member extending toward the central axis of the fixed base 32, and a plurality of (six in the present embodiment) are provided at symmetrical positions across the central axis.
- the contact part 35T which contacts the cradle 31 among the elastic members 35 is spherical, and the cradle 31 can move relative to the fixed base 32 along the circumferential direction.
- the elastic member 35 is provided in a state in which it is slightly contracted with respect to its own natural length, and the cradle 31 is fixed to the fixed base in a state of being urged toward its central axis. 32.
- the cradle 31 has its own at least when the talc 25 is pressed by a talc press jig 41 described later or when the metal shell 3 is pressed by a metal press jig 42 described later (that is, when an external force is applied). It can move relative to the talc press jig 41 and the metal fitting press jig 42 along the radial direction.
- a cylindrical metal guide 36 and an insulator guide 37 are attached to the lower side of the inner periphery of the cradle 31.
- the metal fitting guide 36 is formed of a predetermined metal material and is urged upward by a second elastic member 38 that can be expanded and contracted along a vertical direction provided below itself. Further, at least the inner peripheral side of the upper surface 36A of the metal fitting guide 36 has a tapered shape that gradually decreases toward the outer peripheral side, and when the metal shell 3 is supported on the cradle 31, the upper surface 36A The inner periphery of the tip of the metallic shell 3 contacts the tapered portion. The front end portion of the metal shell 3 comes into contact with the upper surface 36A (tapered portion) of the metal guide 36 urged upward, so that the front end portion of the metal shell 3 relative to the cradle 31 along the radial direction. Movement is restricted.
- a recess (not shown) capable of accommodating the ground electrode 27 is provided on the upper surface 36A of the metal guide 36. When the metal shell 3 is supported by the metal guide 36, the ground electrode 27 is placed in the recess. Is housed.
- the insulator guide 37 is inserted into the metal guide 36 in a state where the center axis of the insulator guide 37 coincides with the center axis of the metal guide 36, and is formed of a predetermined resin material.
- a third elastic member 39 that can extend and contract along the vertical direction is provided below the insulator guide 37, and the insulator guide 37 is urged upward by the third elastic member 39. It is in the state.
- the upper surface 37A of the insulator guide 37 has a tapered shape that gradually increases toward the outer peripheral side, and when the metal shell 3 is supported on the cradle 31, the insulator 2 with respect to the upper surface 37A. The outer periphery of the tip of the contact.
- the distal end portion of the insulator 2 comes into contact with the upper surface 37A of the insulator guide 37 biased upward, so that relative movement along the radial direction of the distal end portion of the insulator 2 with respect to the cradle 31 is restricted.
- the A projecting portion 37 ⁇ / b> B that protrudes outward in the radial direction and has a larger outer diameter than the inner diameter of the metal guide 36 is provided on the lower side of the insulator guide 37 and exposed from the metal guide 36. .
- the upper limit position of the insulator guide 37 with respect to the metal fitting guide 36 is set by the protrusion 37B.
- the lower limit position of the insulator guide 37 with respect to the metal fitting guide 36 can be adjusted to some extent, even when manufacturing the spark plug 1 in which the protrusion amount of the tip of the insulator 2 with respect to the tip of the metal shell 3 is different.
- the metal fitting guide 36 and the insulator guide 37 can be used in common.
- the outer peripheral surface of the metal guide 36 is in contact with the cradle 31 with almost no gap, and the metal guide 36 and the insulator guide 37 cannot move relative to the cradle 31 along their radial direction. It has become. Accordingly, the metal guide 36 and the insulator guide 37 move together with the cradle 31 when the cradle 31 moves relative to the fixed base 32.
- the insulator 2 (the rear end side body portion 10 and the large diameter portion 11) is interposed between the metal shell 3.
- the ring member 23, the talc 25, and the ring member 24 are arranged in this order in the formed annular space 40.
- the metallic shell 3 is conveyed below the cylindrical talc press jig 41 that can move along the axis CL1 (vertical) direction.
- the transport table 33 is stopped in a state where the center axis CL2 of the pressing jig 41 and the center axis of the cradle 31 (which coincides with the axis line CL1) substantially coincide (in the present embodiment, a slight deviation).
- the talc press jig 41 is moved downward, and the talc 25 is pressed through the ring member 24 at the tip of the talc press jig 41.
- the cradle 31 is held by the elastic member 35 without moving until at least a part of the insulator 2 enters the inner periphery of the talc press jig 41.
- the cradle 31 has its own central axis (coincided with the axis CL1) so that it coincides with the central axis CL2 of the talc press jig 41.
- the talc pressing step includes an eccentricity adjusting step for reducing the eccentricity in the radial direction between the central axis CL2 of the talc pressing jig 41 and the axis CL1 of the insulator 2.
- the caulking step is performed, and as shown in FIG. 7, the metal shell 3 is conveyed below a cylindrical metal fitting pressing jig 42 that can move along the axis CL1 (vertical) direction. Then, the transport table 33 is stopped in a state where the center axis CL3 of the metal fitting pressing jig 42 and the center axis (axis line CL1) of the cradle 31 substantially coincide with each other (a slightly shifted state in this embodiment).
- the metal fitting pressing jig 42 is provided with a caulking forming portion 42F having a curved surface shape corresponding to the shape of the caulking portion 20 on its inner peripheral surface.
- the metal fitting jig 42 is moved downward to bring the caulking forming portion 42 ⁇ / b> F into contact with the rear end portion of the metal shell 3. 3 is applied with a pressing force along the direction of the axis CL1.
- the thin portion between the seat portion 16 and the tool engaging portion 19 bulges and deforms outward in the radial direction, and the rear end side opening of the metal shell 3 is in the radial direction.
- the caulking portion 20 is formed by bending inward. As a result, the insulator 2 and the metal shell 3 are fixed.
- the cradle 31 is held without moving by the elastic member 35 until at least a part of the insulator 2 enters the inner periphery of the metal fitting jig 42. ing.
- the cradle 31 has its own central axis (which coincides with the axis CL1) coincides with the central axis CL3 of the fitting press jig 42.
- the metal plate moves relative to the metal fitting pressing jig 42 (fixing table 32). That is, the caulking process includes an eccentricity adjusting process for reducing the eccentricity in the radial direction between the central axis CL3 of the metal fitting pressing jig 42 and the axis CL1 of the insulator 2.
- the tip portion of the insulator 2 is held by the insulator guide 37 in both the talc pressing step and the caulking step, but the talc press is performed without holding the tip portion of the insulator 2. It is good also as performing a process and a caulking process.
- a pedestal 31 that can move relative to the fixed base 32 may be used (that is, either one of the steps is an eccentricity adjustment step). May also be included).
- the ground electrode 27 is bent toward the center electrode 5, and the size of the spark discharge gap 28 between the center electrode 5 and the ground electrode 27 is adjusted, as described above. A spark plug 1 is obtained.
- the annular gap 34 is formed between the outer peripheral surface of the cradle 31 and the inner peripheral surface of the fixed base 32, and the cradle that supports the metal shell 3. 32 is movable relative to the pressing jig 41 (42) along its own radial direction.
- the cradle 31 is supported on the fixed base 32 by the elastic member 35, the cradle 31 and the fixed base 32 are basically arranged in the same relative positional relationship unless an external force is applied. The That is, even when the cradle 25 is moved relative to the fixed base 32 when the talc 25 is pressed or when the caulking portion 20 is formed, the cradle 31 returns to its original position. Therefore, the influence of the axial alignment between the center axis CL2 (CL3) of the pressing jig 41 (42) and the axis CL1 of the insulator 2 does not affect the subsequent talc pressing process or the caulking process.
- the pedestal 31 that can move relative to the fixed base 32, the stress applied to the insulator 2 in the talc pressing process and the caulking process is reduced while the tip of the insulator 2 is held. It is possible to prevent damage to the insulator 2 which is a concern when the tip of the insulator 2 is held.
- the cradle 31 is held without moving until at least a part of the insulator 2 enters the inner periphery of the pressing jig 41 (42). It has become. Therefore, the situation in which the axis CL1 of the insulator 2 is largely displaced from the center axis CL2 (CL3) of the press jig 41 (42) can be prevented more reliably, and the insulator 2 and the terminal electrode 6 can be prevented from being displaced. The collision of the pressing jig 41 (42) can be prevented. As a result, damage to the insulator 2 and the terminal electrode 6 can be prevented more reliably.
- the insulator is used. 2 is slightly shifted or inclined with respect to the central axis of the metal shell 3, so that a horizontal spark or the like is generated between the center electrode 5 and the metal shell 3. Abnormal discharge is likely to occur. That is, in the spark plug 1 of the present embodiment, the deviation or inclination of the axis CL1 tends to adversely affect the ignitability compared to the spark plug having a relatively large distance L.
- the displacement and inclination of the axis line CL1 can be effectively suppressed, so that the distance L is relatively small, and the occurrence of abnormal discharge due to the displacement and inclination of the axis line CL1 is particularly a concern. Also in the plug 1, the occurrence of abnormal discharge can be effectively prevented. In other words, the present invention is particularly effective when manufacturing a spark plug in which the distance L is relatively small.
- the outline of the centering accuracy evaluation test is as follows. That is, in the talc pressing step, when the metal shell is arranged below the talc press jig, the metal shell is arranged by shifting the central axis of the talc press jig and the axis of the insulator by 0.4 mm. Then, the talc was pressed with a talc press jig, and the amount of deviation between the axis of the insulator and the central axis of the metal shell when the spark plug was viewed from the front end side in the axial direction was measured.
- the tip of the insulator 2 is held by the insulator guide, and the tip of the insulator 2 is held by the insulator guide when the metal shell is supported by the fixed base (similar to the case 2).
- the talc is pressed in a state where the central axis of the talc press jig and the axis of the insulator are shifted by 0.4 mm, as in the above test. The test was performed several times in each case. Then, the obtained spark plug was observed to confirm the presence or absence of breakage at the tip of the insulator due to pressing of the talc, and the breakage occurrence rate (breakage rate) was calculated.
- FIG. 11 shows the percentage of damage in both cases.
- the suppression effect such as an axis shift by using a movable cradle
- the terminal electrode might be damaged, but in the case A, it was revealed that the terminal electrode can be more reliably prevented from being damaged.
- the axis of the insulator is made larger than the central axis of the talc press jig by holding the cradle until at least a part of the insulator enters the inner periphery of the talc press jig. This is considered to be because the situation described above was prevented more reliably and the collision of the talc press jig with the terminal electrode was suppressed.
- the cradle is held until at least a part of the insulator enters the inner periphery of the talc press jig. It can be said that it is preferable.
- the talc press jig may come into contact with the rear end portion of the insulator and the insulator may be damaged.
- the insulator can be prevented from being damaged by holding the cradle until at least a part of the insulator enters the inner periphery of the talc press jig.
- the cradle is held until at least a part of the insulator enters the inner periphery of the metal pressing jig. By doing so, damage to the terminal electrode and the insulator can be prevented.
- the cradle 31 is supported by the elastic member 35 with respect to the fixed base 32, and has a gap 34 between the fixed base 32 and the press jig 41 (42). Until the talc 25 (the metal shell 3) is pressed, it can be moved relative to the press jig 41 (42), and at least a part of the insulator 2 enters the inner periphery of the press jig 41 (42). It is comprised so that it may be held during.
- FIGS. 13A and 13B and FIGS. 14A and 14B it is arranged so as to sandwich the outer peripheral surface of the cradle 31 and is in contact with the cradle 31.
- the cradle 31 is held by the holding devices 51 and 52 (for example, an air cylinder or the like) that can be separated until at least a part of the insulator 2 enters the inner periphery of the press jigs 41 and 42, as shown in FIG.
- the holding device 51, 52 is released from holding the receiving base 31,
- the base 31 may be movable relative to the press jigs 41 and 42.
- the holding device 55 is supported by a plurality of elastic members 53, 54 extending in the vertical direction, and is provided above the outer peripheral side thereof by an urging force from the elastic members 53, 54.
- , 56 is held in contact with the press jigs 41, 42 along the radial direction thereof by separating from the holding devices 55, 56 with its own downward movement.
- a cradle 31 may be used. Specifically, until at least a part of the insulator 2 enters the inner periphery of the press jigs 41 and 42, by contacting the holding devices 55 and 56 by the urging force from the elastic members 53 and 54, The cradle 31 is held.
- the elastic members 53 and 54 are compressed and deformed by the pressing force of the pressing jigs 41 and 42 as shown in FIGS.
- the cradle 31 can be moved relative to the press jigs 41 and 42 along its own radial direction.
- the metal shell 3 has a relatively small diameter and the distance L is relatively small.
- the spark plug that can be manufactured according to the present invention is particularly limited. It is not a thing. Therefore, for example, the present invention may be adopted when manufacturing a spark plug in which the screw diameter of the metal shell 3 exceeds M12 and the distance L is relatively large.
- 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)].
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Abstract
Description
前記絶縁体の外周に設けられた筒状の主体金具と、
前記絶縁体と前記主体金具との間に充填された滑石とを備えたスパークプラグの製造方法であって、
前記絶縁体が挿通された前記主体金具を筒状の受台により支持した上で、筒状の滑石プレス治具により前記軸線方向に沿って前記滑石を押圧する滑石押圧工程を含み、
前記受台は、少なくとも前記滑石プレス治具による前記滑石の押圧時に、自身の径方向に沿って前記滑石プレス治具に対して相対移動可能とされ、
前記滑石押圧工程は、前記滑石プレス治具の中心軸と前記絶縁体の軸線との前記径方向における偏心を小さくする偏心調整工程を含むことを特徴とする。
前記受台の外周面と前記固定台の内周面との間には環状の隙間が形成され、前記受台は、自身の径方向に沿って前記固定台に対して相対移動可能とされることを特徴とする。
前記滑石押圧工程の後において、筒状の金具プレス治具により前記軸線方向に沿って前記主体金具の後端部を押圧し、前記加締め部を形成する加締め工程を含み、
前記加締め工程において、少なくとも前記金具プレス治具による前記主体金具の押圧時に、自身の径方向に沿って前記金具プレス治具に対して相対移動可能とされた前記受台により、前記絶縁体が挿通された前記主体金具を支持した上で、前記金具プレス治具により前記加締め部を形成することを特徴とする。
前記絶縁体の外周に設けられた筒状の主体金具とを備え、
前記主体金具の後端部に設けられた径方向内側に屈曲する加締め部により前記絶縁体と前記主体金具とが固定されたスパークプラグの製造方法であって、
前記絶縁体が挿通された前記主体金具を筒状の受台により支持した上で、筒状の金具プレス治具により前記軸線方向に沿って前記主体金具の後端部を押圧し、前記加締め部を形成する加締め工程を含み、
前記受台は、少なくとも前記金具プレス治具による前記主体金具の押圧時に、自身の径方向に沿って前記金具プレス治具に対して相対移動可能とされ、
前記加締め工程は、前記金具プレス治具の中心軸と前記絶縁体の軸線との前記径方向における偏心を小さくする偏心調整工程を含むことを特徴とする。
前記受台の外周面と前記固定台の内周面との間には環状の隙間が形成され、前記受台は、自身の径方向に沿って前記固定台に対して相対移動可能とされることを特徴とする。
前記絶縁体の外周に設けられた筒状の主体金具と、
前記絶縁体と前記主体金具との間に充填された滑石とを備えたスパークプラグの製造装置であって、
前記主体金具を支持する筒状の受台と、
前記軸線方向に沿って移動可能な筒状の滑石プレス治具とを備え、
前記絶縁体が挿通された前記主体金具を前記受台により支持した上で、前記滑石プレス治具を移動させることにより前記滑石を押圧し、
前記受台は、少なくとも前記滑石プレス治具による前記滑石の押圧時に、自身の径方向に沿って前記滑石プレス治具に対して相対移動可能とされることを特徴とする。
前記受台と前記固定台との間に設けられた複数の弾性部材とを備え、
前記受台の外周面と前記固定台の内周面との間には環状の隙間が形成され、前記受台は、自身の径方向に沿って前記固定台に対して相対移動可能とされることを特徴とする。
前記軸線方向に沿って移動可能な筒状の金具プレス治具を備え、
前記絶縁体が挿通された前記主体金具を前記受台により支持した上で、前記金具プレス治具を移動させ前記主体金具の後端部を押圧することにより、前記加締め部を形成し、
前記受台は、少なくとも前記金具プレス治具による前記主体金具の押圧時に、自身の径方向に沿って前記金具プレス治具に対して相対移動可能とされることを特徴とする。
前記絶縁体の外周に設けられた筒状の主体金具とを備え、
前記主体金具の後端部に設けられた径方向内側に屈曲する加締め部により前記絶縁体と前記主体金具とが固定されたスパークプラグの製造装置であって、
前記主体金具を支持する筒状の受台と、
前記軸線方向に沿って移動可能な筒状の金具プレス治具とを備え、
前記絶縁体が挿通された前記主体金具を前記受台により支持した上で、前記金具プレス治具を移動させ前記主体金具の後端部を押圧することにより、前記加締め部を形成し、
前記受台は、少なくとも前記金具プレス治具による前記主体金具の押圧時に、自身の径方向に沿って前記金具プレス治具に対して相対移動可能とされることを特徴とする。
前記受台と前記固定台との間に設けられた複数の弾性部材とを備え、
前記受台の外周面と前記固定台の内周面との間には環状の隙間が形成され、前記受台は、自身の径方向に沿って前記固定台に対して相対移動可能とされることを特徴とする。
ケースAでは、端子電極の損傷をより確実に防止できることが明らかとなった。これは、滑石プレス治具の内周に絶縁碍子の少なくとも一部が入るまでの間、受台を保持したことで、滑石プレス治具の中心軸に対して絶縁碍子の軸線が大きくすれてしまうという事態がより確実に防止され、端子電極に対する滑石プレス治具の衝突が抑制されたためであると考えられる。
2…絶縁碍子(絶縁体)
3…主体金具
20…加締め部
25…滑石
31…受台
32…固定台
34…隙間
35…弾性部材
41…滑石プレス治具
42…金具プレス治具
CL1…(絶縁碍子の)軸線
CL2…(滑石プレス治具の)中心軸
CL3…(金具プレス治具の)中心軸
Claims (17)
- 軸線方向に延びる筒状の絶縁体と、
前記絶縁体の外周に設けられた筒状の主体金具と、
前記絶縁体と前記主体金具との間に充填された滑石とを備えたスパークプラグの製造方法であって、
前記絶縁体が挿通された前記主体金具を筒状の受台により支持した上で、筒状の滑石プレス治具により前記軸線方向に沿って前記滑石を押圧する滑石押圧工程を含み、
前記受台は、少なくとも前記滑石プレス治具による前記滑石の押圧時に、自身の径方向に沿って前記滑石プレス治具に対して相対移動可能とされ、
前記滑石押圧工程は、前記滑石プレス治具の中心軸と前記絶縁体の軸線との前記径方向における偏心を小さくする偏心調整工程を含むことを特徴とするスパークプラグの製造方法。 - 前記受台は、その外周側に配置された固定台に対して、当該固定台との間に設けられた複数の弾性部材により支持されており、
前記受台の外周面と前記固定台の内周面との間には環状の隙間が形成され、前記受台は、自身の径方向に沿って前記固定台に対して相対移動可能とされ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。 - 前記スパークプラグにおいては、前記主体金具の後端部に設けられた径方向内側に屈曲する加締め部により、前記絶縁体と前記主体金具とが固定されており、
前記滑石押圧工程の後において、筒状の金具プレス治具により前記軸線方向に沿って前記主体金具の後端部を押圧し、前記加締め部を形成する加締め工程を含み、
前記加締め工程において、少なくとも前記金具プレス治具による前記主体金具の押圧時に、自身の径方向に沿って前記金具プレス治具に対して相対移動可能とされた前記受台により、前記絶縁体が挿通された前記主体金具を支持した上で、前記金具プレス治具により前記加締め部を形成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。 - 前記滑石押圧工程においては、前記絶縁体の先端部が保持され、前記受台に対する前記絶縁体の先端部の径方向に沿った相対移動が規制されることを特徴とする請求項1乃至3のいずれか1項に記載のスパークプラグの製造方法。
- 前記滑石押圧工程においては、前記滑石プレス治具の内周に前記絶縁体の少なくとも一部が入るまでの間、前記受台を保持することを特徴とする請求項1乃至4のいずれか1項に記載のスパークプラグの製造方法。
- 軸線方向に延びる筒状の絶縁体と、
前記絶縁体の外周に設けられた筒状の主体金具とを備え、
前記主体金具の後端部に設けられた径方向内側に屈曲する加締め部により前記絶縁体と前記主体金具とが固定されたスパークプラグの製造方法であって、
前記絶縁体が挿通された前記主体金具を筒状の受台により支持した上で、筒状の金具プレス治具により前記軸線方向に沿って前記主体金具の後端部を押圧し、前記加締め部を形成する加締め工程を含み、
前記受台は、少なくとも前記金具プレス治具による前記主体金具の押圧時に、自身の径方向に沿って前記金具プレス治具に対して相対移動可能とされ、
前記加締め工程は、前記金具プレス治具の中心軸と前記絶縁体の軸線との前記径方向における偏心を小さくする偏心調整工程を含むことを特徴とするスパークプラグの製造方法。 - 前記受台は、その外周側に配置された固定台に対して、当該固定台との間に設けられた複数の弾性部材により支持されており、
前記受台の外周面と前記固定台の内周面との間には環状の隙間が形成され、前記受台は、自身の径方向に沿って前記固定台に対して相対移動可能とされることを特徴とする請求項6に記載のスパークプラグの製造方法。 - 前記加締め工程においては、前記絶縁体の先端部が保持され、前記受台に対する前記絶縁体の先端部の径方向に沿った相対移動が規制されることを特徴とする請求項3又は6に記載のスパークプラグの製造方法。
- 前記加締め工程においては、前記金具プレス治具の内周に前記絶縁体の少なくとも一部が入るまでの間、前記受台を保持することを特徴とする請求項3、5又は7に記載のスパークプラグの製造方法。
- 軸線方向に延びる筒状の絶縁体と、
前記絶縁体の外周に設けられた筒状の主体金具と、
前記絶縁体と前記主体金具との間に充填された滑石とを備えたスパークプラグの製造装置であって、
前記主体金具を支持する筒状の受台と、
前記軸線方向に沿って移動可能な筒状の滑石プレス治具とを備え、
前記絶縁体が挿通された前記主体金具を前記受台により支持した上で、前記滑石プレス治具を移動させることにより前記滑石を押圧し、
前記受台は、少なくとも前記滑石プレス治具による前記滑石の押圧時に、自身の径方向に沿って前記滑石プレス治具に対して相対移動可能とされることを特徴とするスパークプラグの製造装置。 - 前記受台の外周側に配置された固定台と、
前記受台と前記固定台との間に設けられた複数の弾性部材とを備え、
前記受台の外周面と前記固定台の内周面との間には環状の隙間が形成され、前記受台は、自身の径方向に沿って前記固定台に対して相対移動可能とされることを特徴とする請求項10に記載のスパークプラグの製造装置。 - 前記滑石プレス治具の移動時において、前記滑石プレス治具の内周に前記絶縁体の少なくとも一部が入るまでの間、前記受台を保持することを特徴とする請求項10又は11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においては、前記主体金具の後端部に設けられた径方向内側に屈曲する加締め部により、前記絶縁体と前記主体金具とが固定されており、
前記軸線方向に沿って移動可能な筒状の金具プレス治具を備え、
前記絶縁体が挿通された前記主体金具を前記受台により支持した上で、前記金具プレス治具を移動させ前記主体金具の後端部を押圧することにより、前記加締め部を形成し、
前記受台は、少なくとも前記金具プレス治具による前記主体金具の押圧時に、自身の径方向に沿って前記金具プレス治具に対して相対移動可能とされることを特徴とする請求項10乃至12のいずれか1項に記載のスパークプラグの製造装置。 - 軸線方向に延びる筒状の絶縁体と、
前記絶縁体の外周に設けられた筒状の主体金具とを備え、
前記主体金具の後端部に設けられた径方向内側に屈曲する加締め部により前記絶縁体と前記主体金具とが固定されたスパークプラグの製造装置であって、
前記主体金具を支持する筒状の受台と、
前記軸線方向に沿って移動可能な筒状の金具プレス治具とを備え、
前記絶縁体が挿通された前記主体金具を前記受台により支持した上で、前記金具プレス治具を移動させ前記主体金具の後端部を押圧することにより、前記加締め部を形成し、
前記受台は、少なくとも前記金具プレス治具による前記主体金具の押圧時に、自身の径方向に沿って前記金具プレス治具に対して相対移動可能とされることを特徴とするスパークプラグの製造装置。 - 前記受台の外周側に配置された固定台と、
前記受台と前記固定台との間に設けられた複数の弾性部材とを備え、
前記受台の外周面と前記固定台の内周面との間には環状の隙間が形成され、前記受台は、自身の径方向に沿って前記固定台に対して相対移動可能とされることを特徴とする請求項14に記載のスパークプラグの製造装置。 - 前記金具プレス治具の移動時において、前記金具プレス治具の内周に前記絶縁体の少なくとも一部が入るまでの間、前記受台を保持することを特徴とする請求項14又は15に記載のスパークプラグの製造装置。
- 前記絶縁体の先端部を保持し、前記受台に対する前記絶縁体の先端部の径方向に沿った相対移動を規制する絶縁体ガイドを備えることを特徴とする請求項10乃至16のいずれか1項に記載のスパークプラグの製造装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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CN201180055934.XA CN103222139B (zh) | 2010-11-22 | 2011-11-11 | 火花塞的制造方法及制造装置 |
JP2012512720A JP5285810B2 (ja) | 2010-11-22 | 2011-11-11 | スパークプラグの製造方法及び製造装置 |
DE112011103855.0T DE112011103855B4 (de) | 2010-11-22 | 2011-11-11 | Verfahren und Vorrichtung zur Herstellung einer Zündkerze |
KR1020137016041A KR101413362B1 (ko) | 2010-11-22 | 2011-11-11 | 스파크 플러그의 제조방법 및 제조장치 |
US13/880,088 US8939808B2 (en) | 2010-11-22 | 2011-11-11 | Method and device for manufacturing spark plug |
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JP2010259631 | 2010-11-22 | ||
JP2010-259631 | 2010-11-22 |
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WO2012070409A1 true WO2012070409A1 (ja) | 2012-05-31 |
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PCT/JP2011/076053 WO2012070409A1 (ja) | 2010-11-22 | 2011-11-11 | スパークプラグの製造方法及び製造装置 |
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US (1) | US8939808B2 (ja) |
JP (1) | JP5285810B2 (ja) |
KR (1) | KR101413362B1 (ja) |
CN (1) | CN103222139B (ja) |
DE (1) | DE112011103855B4 (ja) |
WO (1) | WO2012070409A1 (ja) |
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DE102015214057B4 (de) * | 2015-07-24 | 2017-12-28 | Ford Global Technologies, Llc | Verfahren zur Herstellung einer Zündkerze mittels einer mit Pulver befüllten Kapsel sowie Zündkerze |
JP6457470B2 (ja) * | 2016-12-12 | 2019-01-23 | 日本特殊陶業株式会社 | スパークプラグの製造方法 |
JP6839218B2 (ja) * | 2019-02-26 | 2021-03-03 | 日本特殊陶業株式会社 | スパークプラグの製造方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS4826687B1 (ja) * | 1969-06-16 | 1973-08-14 | ||
JP2003257582A (ja) * | 2002-02-27 | 2003-09-12 | Ngk Spark Plug Co Ltd | スパークプラグの製造方法及びスパークプラグ |
JP2010212230A (ja) * | 2009-02-10 | 2010-09-24 | Ngk Spark Plug Co Ltd | スパークプラグの製造方法 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2111916A (en) * | 1936-03-07 | 1938-03-22 | Electric Auto Lite Co | Spark plug |
JPS4826687A (ja) | 1971-08-12 | 1973-04-07 | ||
JPH1032077A (ja) * | 1996-07-15 | 1998-02-03 | Ngk Spark Plug Co Ltd | スパークプラグの組付方法 |
JP4167816B2 (ja) * | 2001-04-27 | 2008-10-22 | 日本特殊陶業株式会社 | スパークプラグの製造方法 |
JP4413721B2 (ja) * | 2004-09-10 | 2010-02-10 | 日本特殊陶業株式会社 | スパークプラグの製造方法 |
JP4413728B2 (ja) | 2004-09-24 | 2010-02-10 | 日本特殊陶業株式会社 | スパークプラグ |
JP2006236906A (ja) | 2005-02-28 | 2006-09-07 | Ngk Spark Plug Co Ltd | スパークプラグの製造方法 |
US7557496B2 (en) * | 2005-03-08 | 2009-07-07 | Ngk Spark Plug Co., Ltd. | Spark plug which can prevent lateral sparking |
JP4653604B2 (ja) * | 2005-09-13 | 2011-03-16 | 日本特殊陶業株式会社 | スパークプラグの検査方法およびそれを用いた製造方法 |
US8198791B2 (en) | 2008-04-02 | 2012-06-12 | Ngk Spark Plug Co., Ltd. | Spark plug, and method for manufacturing the same |
JP5192461B2 (ja) | 2009-07-31 | 2013-05-08 | 日本特殊陶業株式会社 | 複合部品の製造装置及び製造方法 |
-
2011
- 2011-11-11 WO PCT/JP2011/076053 patent/WO2012070409A1/ja active Application Filing
- 2011-11-11 US US13/880,088 patent/US8939808B2/en not_active Expired - Fee Related
- 2011-11-11 DE DE112011103855.0T patent/DE112011103855B4/de not_active Expired - Fee Related
- 2011-11-11 JP JP2012512720A patent/JP5285810B2/ja not_active Expired - Fee Related
- 2011-11-11 KR KR1020137016041A patent/KR101413362B1/ko not_active IP Right Cessation
- 2011-11-11 CN CN201180055934.XA patent/CN103222139B/zh not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4826687B1 (ja) * | 1969-06-16 | 1973-08-14 | ||
JP2003257582A (ja) * | 2002-02-27 | 2003-09-12 | Ngk Spark Plug Co Ltd | スパークプラグの製造方法及びスパークプラグ |
JP2010212230A (ja) * | 2009-02-10 | 2010-09-24 | Ngk Spark Plug Co Ltd | スパークプラグの製造方法 |
Also Published As
Publication number | Publication date |
---|---|
CN103222139A (zh) | 2013-07-24 |
KR101413362B1 (ko) | 2014-06-27 |
DE112011103855T5 (de) | 2013-08-14 |
US8939808B2 (en) | 2015-01-27 |
US20130225029A1 (en) | 2013-08-29 |
KR20130094843A (ko) | 2013-08-26 |
CN103222139B (zh) | 2014-09-17 |
JPWO2012070409A1 (ja) | 2014-05-19 |
JP5285810B2 (ja) | 2013-09-11 |
DE112011103855B4 (de) | 2018-12-13 |
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