WO2013145502A1 - スパークプラグ - Google Patents
スパークプラグ Download PDFInfo
- Publication number
- WO2013145502A1 WO2013145502A1 PCT/JP2013/000085 JP2013000085W WO2013145502A1 WO 2013145502 A1 WO2013145502 A1 WO 2013145502A1 JP 2013000085 W JP2013000085 W JP 2013000085W WO 2013145502 A1 WO2013145502 A1 WO 2013145502A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- spark plug
- accommodated
- peripheral surface
- inner peripheral
- insulator
- Prior art date
Links
Images
Classifications
-
- 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
- H01T13/02—Details
- H01T13/04—Means providing electrical connection to 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
-
- 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
- H01T13/02—Details
- H01T13/04—Means providing electrical connection to sparking plugs
- H01T13/05—Means providing electrical connection to sparking plugs combined with interference suppressing or shielding means
Definitions
- the present invention relates to a spark plug used for ignition of an internal combustion engine, and more particularly to a spark plug having a resistor inside.
- a spark plug used for ignition of an internal combustion engine such as an automobile engine generally includes a cylindrical metal shell, a cylindrical insulator disposed in an inner hole of the metal shell, and a tip side of the insulator.
- An electrode Furthermore, a spark plug is also known in which a resistor is provided between the center electrode and the terminal fitting in the shaft hole for the purpose of preventing the occurrence of radio noise. *
- claim 1 of Patent Document 1 includes: “... the diameter D of the conductive glass seal layer is in a range of 3.3 mm or less and the conductive glass seal layer.
- the spark plug is characterized in that the joint surface between the resistor and the resistor is formed into a curved surface.
- a spark plug having improved vibration resistance and resistance load life characteristics and having a reduced diameter can be provided by enhancing the adhesion between the resistor and the conductive glass seal layer” ( Paragraph number 0012 column).
- An object of the present invention is to provide a spark plug excellent in load life performance.
- the resistor is formed by a mixture of glass powder, non-metallic powder such as carbon black, and metal powder.
- a seal layer having a relatively high content of metal powder may be provided between the resistor, the center electrode, and the terminal fitting.
- the spark plug provided with the resistor and, if necessary, the seal layer, the center electrode, the insulator, and the terminal fitting are assembled as follows. First, after inserting the center electrode into the shaft hole of the insulator, the resistor composition for forming the resistor and the sealing powder for forming the seal layer are filled. Next, by inserting the terminal fitting into the shaft hole and press-fitting the terminal fitting while heating the resistor composition and the seal powder, the resistor composition and the seal powder are compressed to form a resistor and a seal layer. Sealed. *
- the spark plug assembled as described above may have a reduced load life performance due to an increase in the resistance value of the resistor or a decrease in adhesion between the seal layer, the resistor, the center electrode, and the terminal fitting.
- the inventors increased the resistance value of the resistor by effectively transmitting the press pressure from the terminal fitting to the resistor composition when the terminal fitting is press-fitted into the shaft hole. We thought that we can suppress. *
- a spark plug comprising: a terminal fitting having a recess forming region formed with a metal fitting that accommodates a tip end side of the insulator and holds the insulator; and the following (1) to (5): A spark plug characterized by satisfying a condition.
- the length H in the axial direction of the accommodated portion is 35 mm or more.
- the length F in the axial direction of the recess forming region is 13 mm or more.
- the accommodated part has a smooth part on the outer peripheral surface thereof.
- the ratio (A / B) of the diameter A at the tip of the accommodated portion to the inner diameter B of the insulator at the tip is 0.9 ⁇ A / B ⁇ 0.98.
- Vickers hardness measured at the center of a cut surface obtained by cutting the accommodated part in a direction perpendicular to the axial direction is 150 Hv or more and 350 Hv or less
- the insulator is disposed on a rear end side of the first inner peripheral surface having the inner diameter B, the first inner peripheral surface, and the metal shell, A second inner peripheral surface having a diameter larger than the inner diameter B, and a stepped portion connecting the first inner peripheral surface and the second inner peripheral surface, At least a part of the recess forming region is disposed in a space surrounded by the stepped portion.
- the spark plug according to ⁇ 1> or ⁇ 2> at least a part of the smooth portion is disposed in a space surrounded by the second inner peripheral surface.
- a depth D of the recess in the recess formation region is 0.07 mm or more.
- the inner diameter B is 3.5 mm or less.
- the maximum value (JK) max of the difference (JK) from the inner diameter J of the inner peripheral surface is 0.05 mm or more and 0.25 mm or less.
- an axial length (HF) of the smooth portion is 8 mm or more.
- the ratio (A / B) is 0.93 ⁇ A / B.
- the inner diameter B is 2.9 mm or less.
- the Vickers hardness is 200 Hv or more and 320 Hv or less.
- the terminal fitting and the center electrode are interposed between the terminal fitting and the center electrode in the shaft hole.
- the connecting portion exists only in a space surrounded by the first inner peripheral surface.
- the accommodated portion since the length H in the axial direction of the accommodated portion is 35 mm or more, when the terminal fitting is press-fitted into the shaft hole of the insulator in the spark plug manufacturing process, the accommodated portion is It is easy to bend as compared with a short case, and it is difficult to effectively transmit the press pressure to the resistor composition filled in the shaft hole.
- the portion to be accommodated in the spark plug according to the present invention satisfies the conditions (2) to (5), when the portion to be accommodated is press-fitted into the shaft hole, a sufficient press pressure is applied to the resistor composition. Since it can transmit, a high-density resistor can be formed. As a result, a spark plug excellent in load life performance can be provided.
- the accommodated portion in this invention has a Vickers hardness of 150 Hv or more and 350 Hv or less, preferably 200 Hv or more and 320 Hv or less. Therefore, when the accommodated portion is press-fitted into the shaft hole, the resistor composition is combined with other conditions. The press pressure can be sufficiently transmitted to the object.
- the accommodated portion in the present invention includes a recess forming region in which a plurality of recesses are formed on the outer peripheral surface of the accommodated portion, and the axial length F is 13 mm or more. Since the strength of the part having the recess forming region in the material is improved, the portion to be accommodated becomes difficult to bend, and the press pressure can be sufficiently transmitted to the resistor composition. By making the Vickers hardness of the terminal fitting higher than 320 Hv, it is possible to make it difficult to bend the contained portion. However, if the hardness is too high, the workability is lowered and the life of the jig is shortened. Increase. However, if the recessed portion forming region is provided on the outer peripheral surface of the accommodated portion, it is difficult to bend the accommodated portion without causing such a problem. *
- the accommodated portion has not only a concave portion forming region but also a smooth portion on its outer peripheral surface, and preferably, when the length of the smooth portion in the axial direction is 8 mm or more, Since the strength is lower than the strength of the portion having the recessed portion forming region, the accommodated portion is easily bent at the portion having the smooth portion.
- the resistor composition can be further pressed without causing terminal floating, and as a result, the resistor having high density. Can be formed.
- the said terminal floating means the state where the length of the axial direction of the terminal metal fitting exposed from a shaft hole is longer than the assumed length.
- the ratio (A / B) of the diameter A at the tip of the accommodated portion to the inner diameter B of the insulator at the tip is 0.9 ⁇ A / B ⁇ 0.98, preferably 0.93 ⁇ A.
- /B ⁇ 0.98 there is an appropriate clearance between the accommodated part and the inner wall surface of the insulator, and when the accommodated part is press-fitted into the shaft hole, a press pressure is applied to the resistor composition. Can be transmitted effectively.
- the spark plug that satisfies the conditions (1) to (5) has a density by effectively transmitting the pressing pressure to the resistor composition when the accommodated portion is press-fitted into the shaft hole. Since a high-resistance resistor can be formed, the load life performance is excellent.
- the spark plug according to the present invention has the stepped portion in the shaft hole of the insulator, if the at least part of the recess forming region is disposed in a space surrounded by the stepped portion, When press-fitting into the shaft hole, it is possible to prevent the accommodated portion from bending at the stepped portion. Therefore, it is possible to prevent the pressed portion from being sufficiently transmitted to the resistor composition by being caught by the stepped portion, and as a result, it is possible to provide a spark plug excellent in load life performance. it can.
- the smoothing part when at least a part of the smoothing part is disposed in a space surrounded by the second inner peripheral surface, that is, at least a part of the smoothing part is on the rear end side in the accommodated part.
- the portion to be accommodated when there is a stepped portion in the shaft hole, it is possible to prevent the accommodated portion from being bent and caught by the stepped portion when the accommodated portion is press-fitted into the shaft hole.
- the rear end portion of the portion to be accommodated is appropriately bent so that the terminal does not float. Further press pressure can be applied to the body composition. As a result, a high-density resistor can be formed, and a spark plug excellent in load life performance can be provided.
- the depth D of the concave portion in the concave portion forming region is 0.07 mm or more, the effect of work hardening is easily exhibited, and the strength of the portion having the concave portion forming region in the accommodated portion is improved. For this reason, it becomes difficult for the portion to be accommodated to bend, and the press pressure can be sufficiently transmitted to the resistor composition. As a result, a spark plug excellent in load life performance can be provided.
- the inner diameter B of the spark plug of the present invention is 3.5 mm or less, particularly 2.9 mm or less, the effect of improving the load life performance is further enhanced.
- the spark plug according to the present invention has a maximum difference (JK) between a diameter K of a portion surrounded by the second inner peripheral surface of the accommodated portion and an inner diameter J of the second inner peripheral surface at the portion.
- JK maximum difference
- the value (JK) max is 0.05 mm or more and 0.25 mm or less
- the portion surrounded by the second inner peripheral surface of the accommodated portion is appropriately bent when the accommodated portion is press-fitted into the shaft hole.
- the portion surrounded by the second inner peripheral surface of the portion to be accommodated is appropriately bent, thereby floating the terminal. Further press pressure can be applied to the resistor composition without causing any problems.
- a high-density resistor can be formed, and a spark plug excellent in load life performance can be provided.
- the press pressure applied to the connecting powder forming the connection portion by the terminal metal fitting causes the inner wall surfaces of the terminal metal fitting and the insulator. It is possible to prevent the connection powder from escaping in the clearance between the contact powder and effectively used as a press pressure applied to the connection powder, so that a high-density resistor is formed. Therefore, a spark plug excellent in load life performance can be provided.
- FIG. 1 is an entire cross-sectional explanatory view of a spark plug as an embodiment of the spark plug according to the present invention.
- FIG. 2 is a cross-sectional explanatory view of a main part of a spark plug which is an embodiment of the spark plug according to the present invention.
- FIG. 3 is an explanatory cross-sectional view of a relevant part showing an enlarged recess forming region in a spark plug which is an embodiment of the spark plug of the present invention.
- FIG. 1 shows a spark plug as an embodiment of the spark plug according to the present invention.
- FIG. 1 is an entire cross-sectional explanatory view of a spark plug 1 which is an embodiment of a spark plug according to the present invention.
- the axis of the insulator is O
- the lower side of the paper is defined as the front end direction of the axis O
- the upper side of the paper is defined as the rear end direction of the axis O.
- the spark plug 1 includes an insulator 3 having a shaft hole 2 extending in the direction of the axis O, a center electrode 4 held on the front end side of the shaft hole 2, and a terminal held on the rear end side of the shaft hole 2.
- a ground electrode 8 which is bonded to the surface and is disposed so that the other end faces the central electrode 4 with a gap.
- the metal shell 7 has a substantially cylindrical shape and is formed so as to accommodate and hold the insulator 3.
- a threaded portion 9 is formed on the outer peripheral surface in the front end direction of the metal shell 7, and the spark plug 1 is attached to a cylinder head of an internal combustion engine (not shown) using the threaded portion 9.
- the metal shell 7 can be formed of a conductive steel material, for example, low carbon steel.
- the threaded portion 9 is preferably M12 or less in order to reduce the diameter. *
- the insulator 3 is held on the inner periphery of the metal shell 7 via a talc 10 or a packing 11.
- the insulator 3 is disposed on the rear end side of the first inner peripheral surface 14 surrounding the front end side of the accommodated portion 19, the first inner peripheral surface 14 and the metal shell 7.
- a second inner peripheral surface 16 having a diameter larger than the inner diameter, and a third inner peripheral surface 12 disposed on the distal end side from the first inner peripheral surface 14 and having a diameter smaller than the inner diameter of the first inner peripheral surface 14.
- the first inner peripheral surface 14 and the second inner peripheral surface 16 are connected via a step portion 15, and the first inner peripheral surface 14 and the third inner peripheral surface 12 are connected via a second step portion 13. Yes.
- the insulator 3 is fixed to the metal shell 7 with the end of the insulator 3 in the distal direction protruding from the tip surface of the metal shell 7.
- the insulator 3 is desirably a material having mechanical strength, thermal strength, electrical strength, and the like. Examples of such a material include a ceramic sintered body mainly composed of alumina. *
- the center electrode 4 is surrounded by the third inner peripheral surface 12 of the insulator 3, a large-diameter flange portion 17 provided at the rear end of the center electrode 4 is locked to the second step portion 13, and the tip is insulated.
- the metal shell 7 is insulated and held in a state of protruding from the front end surface of the body 3.
- the center electrode 4 is desirably formed of a material having thermal conductivity, mechanical strength, and the like.
- the center electrode 4 is formed of a Ni-based alloy such as Inconel (trade name).
- the axial center portion of the center electrode 4 may be formed of a metal material having excellent thermal conductivity such as Cu or Ag. *
- the ground electrode 8 is formed in, for example, a substantially prismatic body, one end is joined to the front end surface of the metal shell 7, and is bent into a substantially L shape in the middle, and the front end is connected to the front end of the center electrode 4. Its shape and structure are designed to face each other with a gap.
- the ground electrode 8 is formed of the same material as that for forming the center electrode 4. *
- Precious metal tips 29 and 30 formed of platinum alloy, iridium alloy, or the like may be provided on the surface where the center electrode 4 and the ground electrode 8 face each other. A precious metal tip may be provided on only one of them.
- noble metal tips 29 and 30 are provided on both the center electrode 4 and the ground electrode 8, and a spark discharge gap g is formed between the noble metal tips 29 and 30. .
- the terminal fitting 5 is a terminal for applying a voltage for performing a spark discharge between the center electrode 4 and the ground electrode 8 to the center electrode 4 from the outside.
- the terminal fitting 5 has an outer diameter larger than the inner diameter of the shaft hole 2, is exposed from the shaft hole 2, and a terminal portion 18 and a terminal portion that are partly in contact with the rear end side end surface of the insulator 3 in the axis O direction.
- 18 has a receiving portion 19 that extends in the tip direction from the end face on the tip side in the direction of the axis O and is received in the shaft hole 2.
- the terminal fitting 5 is made of, for example, low carbon steel or the like, and a Ni metal layer is formed on the surface thereof by plating or the like. *
- the to-be-accommodated portion 19 in this embodiment is located on the front end side of the axis O and on the rear end side of the axis O, has a diameter larger than that of the middle torso 21, and is adjacent to the terminal portion 18.
- the middle body part 21 and the body part 22 are connected via a first step part 23.
- the front end side of the middle body portion 21 is surrounded by the first inner peripheral surface 14, the rear end side thereof is surrounded by the second inner peripheral surface 16, and the body portion 22 is surrounded by the second inner peripheral surface 16.
- the accommodated portion 19 in the spark plug 1 of this embodiment has a shape in which two types of cylindrical bodies having different outer diameters are connected, but the outer diameter from the tip of the accommodated portion 19 to the boundary with the terminal portion 18. It may be a cylindrical shape that does not change, or may be a shape in which three or more types of cylindrical bodies having different outer diameters are connected. *
- the connecting portion 6 is disposed between the center electrode 4 and the terminal fitting 5 in the shaft hole 2 and electrically connects the center electrode 4 and the terminal fitting 5.
- the connection unit 6 includes a resistor 26, and the resistor 26 prevents generation of radio noise.
- the connecting portion 6 has a first seal layer 27 between the resistor 26 and the center electrode 4, and a second seal layer 28 between the resistor 26 and the terminal fitting 5. 27 and the second seal layer 28 seal and fix the insulator 3 and the center electrode 4, and the insulator 3 and the terminal fitting 5, respectively.
- the resistor 26 is made of glass powder such as borosilicate soda glass, ceramic powder such as ZrO 2 , non-metallic conductive powder such as carbon black, and / or metal powder such as Zn, Sb, Sn, Ag, Ni, etc. It can be comprised by the resistance material formed by sintering the resistor composition to contain.
- the resistance value of the resistor 5 is usually 100 ⁇ or more.
- the first seal layer 27 and the second seal layer 28 can be configured by a seal material formed by sintering a glass powder such as sodium borosilicate glass and a metal powder such as Cu and Fe. .
- the resistance values of the first seal layer 27 and the second seal layer 28 are usually several hundred m ⁇ or less.
- the connecting portion 6 may be formed of only the resistor 26 without the first seal layer 27 and the second seal layer 28, and one of the first seal layer 27 or the second seal layer 28 and the resistor. 26 may be formed.
- the resistor 26, the first seal layer 27, and the second seal layer 28 are disposed between the center electrode 4 and the terminal fitting 5 in the shaft hole 2, and the first seal layer 27. Is provided in the clearance between the center electrode 4 and the first inner peripheral surface 14, and the second seal layer 28 is also provided in the clearance between the terminal fitting 5 and the first inner peripheral surface 14.
- the second seal layer 28 has not only a clearance between the terminal fitting 5 and the first inner peripheral surface 14, but also a clearance between the terminal fitting 5 and the stepped portion 15, and the terminal fitting 5 and the second inner peripheral surface 16. It may be provided in the clearance between. *
- connection member the resistor material and / or the sealing material constituting the connection portion 6
- resistor composition and / or the seal powder forming the connection portion 6 may be collectively referred to as a connection powder.
- the spark plug of the present invention includes a terminal fitting 5 having a recess forming region 31 in which a plurality of recesses are formed on the outer peripheral surface of the accommodated portion 19, and the following (1) to (5) Satisfy the condition of (1)
- the length H of the accommodated portion 19 in the axis O direction is 35 mm or more.
- the length F in the direction of the axis O of the recess forming region 31 is 13 mm or more.
- the to-be-contained part 19 has the smooth part 32 in the outer peripheral surface.
- the ratio (A / B) of the diameter A at the tip 20 of the accommodated portion 19 to the inner diameter B of the insulator 3 at the tip 20 is 0.9 ⁇ A / B ⁇ 0.98.
- Vickers hardness measured at the center of a cut surface obtained by cutting the accommodated portion 19 in a direction orthogonal to the axis O direction is 150 Hv or more and 350 Hv or less.
- the accommodated portion 19 in the spark plug 1 satisfies the conditions (2) to (5), even if the length H in the axis O direction of the accommodated portion 19 is 35 mm or more, it will be described later.
- the press pressure can be sufficiently transmitted to the resistor composition when the accommodated portion 19 is press-fitted into the shaft hole 2, the resistor 26 having a high density can be formed. A spark plug excellent in life performance can be provided. *
- the contained portion 19 has a Vickers hardness of 150 Hv or more and 350 Hv or less, preferably 200 Hv or more and 320 Hv or less, when the contained portion 19 is press-fitted into the shaft hole 2, In combination, the press pressure can be sufficiently transmitted to the resistor composition. If the Vickers hardness of the accommodated portion 19 is less than 150 Hv, the accommodated portion 19 is likely to bend in a direction orthogonal to the axis O, and it is difficult to effectively transmit the press pressure to the resistor composition. As a result, the high-density resistor 26 cannot be formed, and the load life performance decreases.
- the portion to be accommodated 19 is press-fitted into the shaft hole 2, the portion to be accommodated 19 is hardly curved, so that if the amount of the connecting powder filled in the shaft hole 2 varies, the portion to be accommodated 19 Due to this curvature, the variation cannot be absorbed, and it becomes difficult to reliably accommodate the accommodated portion 19 in the shaft hole 2. Therefore, after the pressing process described later, the terminal portion 18 may not be in contact with the rear end surface of the insulator 3 and the terminal portion 18 may be in a floating state.
- the Vickers hardness is determined by polishing the cut surface obtained by cutting in the direction perpendicular to the axis O in the smooth portion 32 of the accommodated portion 19, and in accordance with JIS Z2244 for five points near the center of the polished surface.
- the Vickers hardness of the accommodated portion 19 at room temperature can be adjusted by selecting a material for forming the terminal fitting or changing the heat treatment conditions. *
- the to-be-contained part 19 includes a recess forming region 31 in which a plurality of recesses are formed on the outer peripheral surface of the to-be-contained part 19.
- the recess forming region 31 is formed by processing the outer peripheral surface of the rod-shaped body forming the accommodated portion 19 when the accommodated portion 19 is formed.
- a processing is applied to a rod-shaped body formed of a metal such as low carbon steel, the strength of the outer peripheral surface of the accommodated portion 19 is improved by work hardening, so the portion having the recess forming region 31 in the accommodated portion 19 Is difficult to bend in a direction perpendicular to the axis O when the accommodated portion 19 is press-fitted into the shaft hole 2.
- the press pressure can be sufficiently transmitted to the resistor composition, and a high-density resistor can be formed. As a result, a spark plug excellent in load life performance can be provided.
- the length F is less than 13 mm, the pressure of the pressurization to the resistor composition is not sufficiently transmitted due to the curvature of the portion 19 to be accommodated, a high-density resistor is not formed, and the load life performance may be inferior. There is. *
- the recess forming region 31 in the spark plug 1 is provided on the entire outer peripheral surface of the middle barrel portion 21 and a part of the outer peripheral surface of the barrel portion 22 continuously to the concave portion forming region 31.
- 19 may be provided in any part of the outer peripheral surface, and it is preferable that at least a part of the recess forming region 31 is disposed in a space surrounded by the step portion 15.
- the recess forming region 31 is provided at least in a portion surrounded by the step portion 15 in the accommodated portion 19 and is not easily bent. It is good to be.
- the recess forming region 31 may not be continuously provided on the outer peripheral surface of the accommodated portion 19 with a length F of 13 mm or more.
- the portion surrounded by the step portion 15 and the vicinity of the tip of the accommodated portion 19 And the total length F of them may be 13 mm or more.
- the recess forming region 31 in the spark plug 1 has a twill knurl shape, but the shape is not particularly limited. For example, a flat knurled shape, a diagonal knurled shape, a square screw shape, a triangular screw shape, a trapezoidal screw shape, and the like. One or a combination of two or more appropriate shapes may be employed.
- the recessed part formation area 31 has a plurality of recessed parts or grooves formed on the outer peripheral surface of the accommodated part 19, for example, when a surface connecting about half the depth of each recessed part is used as a reference surface, It can also be said that the uneven
- the depth D of the concave portion in the concave portion formation region 31 in the radial direction of the axis O is preferably 0.07 mm or more. It is preferably 0.09 mm or more and 0.3 mm or less, particularly preferably 0.1 mm or more and 0.2 mm or less.
- the depth D is within the above range, the effect of work hardening is easily exhibited, and the strength of the portion having the recess forming region 31 in the accommodated portion 19 is improved. Therefore, the to-be-accommodated part 19 becomes difficult to curve.
- the depth D is cut in the direction perpendicular to the axis O in the recess forming region 31, the maximum diameter and the minimum diameter in the obtained cut surface are measured, and this measured value is divided by 2 Can be calculated.
- the accommodated part 19 includes a smoothing part 32. Since the strength of the portion having the smooth portion 32 in the accommodated portion 19 is lower than that of the portion having the recess forming region 31, the accommodated portion 19 is easily bent at the portion having the smooth portion 32. In the pressing process described later, when the accommodated portion 19 is bent appropriately, the pressing pressure can be sufficiently transmitted to the resistor composition, and a resistor having a high density can be formed. The reason can be explained as follows. In the pressing process described later, after the connecting powder forming the first seal layer 27, the resistor 26, and the second seal layer 28 is put into the shaft hole 2, the accommodated portion 19 is inserted into the shaft hole 2. The terminal fitting 5 is disposed so that the tip 20 contacts the connecting powder.
- the rear end surface of the insulator 3 and the tip end surface of the terminal portion 18 are arranged apart from each other, and the rear end surface of the insulator 3 and the terminal portion 18 before the accommodated portion 19 is press-fitted into the shaft hole 2.
- the distance in the direction of the axis O with the tip surface is referred to as a sealing dimension.
- the maximum sealing dimension capable of press-fitting the accommodated portion 19 into the shaft hole 2 until the terminal portion 18 contacts the rear end surface of the insulator 3 in a state where the accommodated portion 19 is not bent is 10 mm.
- the maximum sealing dimension increases by the amount of the accommodated portion 19, for example, 12 mm.
- the sealing dimension By increasing the sealing dimension by 2 mm, it becomes possible to further apply a press pressure to the connecting powder by the accommodated portion 19. Therefore, the high-density resistor 26 can be formed, and as a result, a spark plug excellent in load life performance can be provided.
- the smoothing part 32 may be provided at any part of the accommodated part 19, but is provided over the entire circumference at a part adjacent to the terminal part 18, that is, a part surrounded by the second inner peripheral surface 16. It is preferable.
- the press pressure may not be effectively transmitted to the resistor composition.
- the pressing force is sufficiently applied to the resistor composition. So there is no problem.
- the accommodated portion 19 of the terminal fitting 5 in which the terminal portion 18 is slightly lifted from the rear end surface of the insulator 3 is reliably accommodated in the shaft hole 2 by bending the accommodated portion 19.
- a press pressure can be further applied to a resistor composition.
- the step portion 15 is present in the shaft hole 2
- the curved portion can be prevented from being caught by the step portion 15 if the smooth portion 32 is present in the portion surrounded by the second inner peripheral surface 16.
- the press pressure can be effectively transmitted to the resistor composition.
- the axial length (HF) of the smooth portion 32 is preferably 8 mm or more.
- the smoothing portion 32 of this embodiment is continuously provided from the rear end of the axis O toward the front end.
- the smoothing portion 32 between the rear end of the accommodated portion 19 and the vicinity of the center in the direction of the axis O is provided. It may be divided into two places and may be divided into three or more places.
- the ratio (A / B) of the diameter A at the tip 20 of the accommodated part 19 to the inner diameter B of the insulator 3 at the tip 20 is 0.9 ⁇ A / B ⁇ 0.98, preferably 0.93 ⁇ A / B ⁇ 0.98.
- a / B is within the above range, an appropriate clearance is provided between the accommodated portion 19 and the first inner peripheral surface 14, and when the accommodated portion 19 is press-fitted into the shaft hole 2, the resistor The press pressure can be effectively transmitted to the composition. As a result, a spark plug excellent in load life performance can be provided.
- a / B is smaller than 0.9, the thickness of the accommodated portion 19 is too small with respect to the inner diameter B of the insulator 3, so that when the accommodated portion 19 is press-fitted into the shaft hole 2, the accommodated portion 19 tends to bend, and the press pressure may not be effectively transmitted to the resistor composition.
- a / B is larger than 0.98, the thickness of the accommodated portion 19 is too thick with respect to the inner diameter B of the insulator 3, so that when the accommodated portion 19 is press-fitted into the shaft hole 2, the accommodated portion
- the clearance between the outer peripheral surface near the tip of 19 and the first inner peripheral surface 14 is small, and there is a possibility that a sufficient amount of sealing material is not filled in this clearance. If a sufficient amount of sealing material is not filled, the load life performance may be lowered.
- the spark plug 1 that satisfies all the conditions (1) to (5)
- a high-density resistor can be formed by effectively transmitting the press pressure to the resistor composition, and the load life performance is excellent.
- the maximum value (JK) of the difference (J ⁇ K) between the diameter K of the portion surrounded by the second inner peripheral surface 16 in the accommodated portion 19 and the inner diameter J of the second inner peripheral surface 16 in the portion ( JK) max is preferably 0.05 mm or more and 0.25 mm or less.
- the maximum value (JK) max is within the above range, when the accommodated portion 19 is press-fitted into the shaft hole 2, the portion surrounded by the second inner peripheral surface 16 of the accommodated portion 19 is appropriately bent. The portion surrounded by the second inner peripheral surface 16 of the accommodated portion 19 is appropriately bent after the accommodated portion 19 is press-fitted into the shaft hole 2 to sufficiently transmit the press pressure to the resistor composition.
- the terminal portion 18 is brought into a floating state without contacting the rear end surface of the insulator 3.
- the resistor composition can be further pressed without causing terminal floating, so that the resistor 26 having a high density can be formed.
- the load life performance is improved.
- a more excellent spark plug can be provided.
- the second seal layer 28 and / or the resistor 26 may be present only in the space surrounded by the first inner peripheral surface 14. That is, the second seal layer 28 and / or the resistor 26 does not exist on the rear end side of the step portion 15, the clearance between the terminal fitting 5 and the step portion 15, and further the terminal fitting 5 and the second inner peripheral surface. It should be absent in the clearance between 16.
- the press process described later is performed.
- the pressing pressure applied to the seal powder and / or the resistor composition by the terminal fitting 5 is caused by the force that the seal powder and / or the resistor composition escapes in the clearance between the terminal fitting 5 and the inner wall surface of the insulator 3. Since the conversion is suppressed and effectively used as the force applied to the seal powder and / or the resistor composition, the resistor 26 having a high density is formed. Therefore, it is possible to provide a spark plug with even better load life performance.
- the spark plug 1 of the present invention is more effective for improving the load life performance.
- the lengths (A), (B), (H), (F), (K), and (J) are measured in a micro X-ray CT apparatus (for example, TOSCANER) from the direction perpendicular to the axis O of the spark plug. -32250 ⁇ hd), and can be obtained by measuring the corresponding part.
- the diameter (A) is measured by measuring a distance in a direction perpendicular to the axis O at a portion of 1 mm from the tip of the accommodated portion 19 toward the rear end of the axis O.
- the inner diameter (B) the distance in the direction perpendicular to the axis O of the shaft hole 2 at the portion is measured.
- the length (H) measures the length in the direction of the axis O from the rear end to the front end of the accommodated portion 19.
- the length (F) measures the maximum length in the direction of the axis O of the recess forming region 31 in the accommodated portion 19.
- the diameter (K) measures the distance in the direction perpendicular to the axis O in the portion surrounded by the second inner peripheral surface 16 in the accommodated portion 19.
- the inner diameter (J) measures the distance in the direction perpendicular to the axis O at the part.
- the spark plug 1 is manufactured, for example, as follows. First, the center electrode 4, the ground electrode 8, the metal shell 7, the terminal metal fitting 5, and the insulator 3 are prepared in a predetermined shape by a known method (preparation process). The terminal fitting 5 is manufactured so as to satisfy at least the conditions (1) to (5). A recess forming region 31 is formed on the outer peripheral surface of the rod-shaped body serving as the accommodated portion 19 by a known knurling method. *
- ground electrode joining step one end of the ground electrode 8 is joined to the front end surface of the metal shell 7 by laser welding or the like. *
- the center electrode 4 is inserted into the shaft hole 2 of the insulator 3, the flange portion 17 of the center electrode 4 is locked to the second step portion 13 of the shaft hole 2, and is surrounded by the third inner peripheral surface 12.
- the center electrode 4 is arranged (center electrode arranging step).
- the seal powder forming the first seal layer 27, the resistor composition forming the resistor 26, and the seal powder forming the second seal layer 28 are put in this order from the rear end side in the shaft hole 2.
- the press pin is inserted into the shaft hole 2 and pre-compressed with a pressure of 60 N / mm 2 or more to fill the space surrounded by the first inner peripheral surface with the seal powder and the resistor composition (filling step). .
- the accommodated portion 19 of the terminal fitting 5 is inserted from the rear end side in the shaft hole 2, and the terminal fitting 5 is arranged so that the tip 20 is in contact with the sealing powder (arrangement step).
- the rear end surface of the insulator 3 and the front end surface of the terminal portion 18 are spaced apart.
- the distance in the direction of the axis O between the rear end surface of the insulator 3 and the front end surface of the terminal portion 18 before the accommodated portion 19 is press-fitted is referred to as a sealing dimension.
- the tip surface of the terminal portion 18 is heated while heating the sealing powder and the resistor composition at a temperature equal to or higher than the glass softening point of the glass powder contained in the sealing powder, for example, at a temperature of 800 to 1000 ° C. for 3 to 30 minutes.
- the terminal fitting 5 is press-fitted until it contacts the rear end surface of the insulator 3, and the sealing powder and the resistor composition are compressed and heated (pressing step).
- the seal is made in a state where the accommodated portion 19 is hardly curved in the direction perpendicular to the axis O.
- Pressure can be effectively applied to the powder and resistor composition, and the seal powder and resistor composition are compressed while heated.
- the distance between the rear end surface of the insulator 3 and the front end surface of the terminal portion 18 becomes smaller.
- the press pressure is sufficiently transmitted to the resistor composition.
- the seal powder and the resistor composition are sintered to form the resistor 26, the first seal layer 27, and the second seal layer 28.
- the spark plug satisfying the above conditions (1) to (5) is formed with a high-density resistor 26 because the press pressure from the terminal fitting 5 to the resistor composition is sufficiently transmitted. Can do. Moreover, it can prevent that the terminal part 18 will be in the state which floated without contacting the rear-end surface of the insulator 3. FIG. In this way, the spark plug 1 excellent in load life performance is manufactured. *
- the gap between the flange portion 17 and the shaft hole 2 and the gap between the middle body portion 21 and the shaft hole 2 are filled with a sealing material, and the center electrode 4 and the terminal fitting 5 are sealed and fixed in the shaft hole 2.
- the sealing material is not present on the rear end side from the step portion 15.
- the tip of the ground electrode 8 is bent toward the center electrode 4, and the spark plug 1 is manufactured such that one end of the ground electrode 8 faces the tip of the center electrode 4.
- the spark plug according to the present invention is used as an ignition plug for an internal combustion engine for automobiles such as a gasoline engine, and the screw portion 9 is formed in a screw hole provided in a head (not shown) that defines a combustion chamber of the internal combustion engine. Are screwed together and fixed in place.
- the spark plug according to the present invention can be used for any internal combustion engine, but is particularly effective in a downsized spark plug, particularly a spark plug having a small inner diameter of the shaft hole of the insulator. Therefore, it can be suitably used for an internal combustion engine that requires a spark plug.
- the spark plug 1 has the step portion 15 in the shaft hole 2, but the portion in the shaft hole 2 in which the accommodated portion 19 is accommodated may have no step and may be formed in a cylindrical shape.
- the accommodated portion 19 is formed by a body portion 22 having a large diameter and a middle body portion 21 having a diameter smaller than that of the body portion 22, but there are portions having different diameters.
- a part of the accommodated portion may be formed in a tapered shape.
- the accommodated portion may have a cylindrical shape without a change in diameter.
- the spark plug shown in FIG. 1 was produced according to the manufacturing process described above.
- the sealing dimension L was determined as follows.
- the sealing dimensions of 10.5 mm to 16.5 mm are divided into a total of 12 sections every 0.5 mm, 20 spark plugs are prepared for each section, and after the pressing process described above, the tip of the terminal portion
- the number of spark plugs in which the surface was separated from the rear end surface of the insulator, that is, the terminal portion was floating, or the insulator was broken by the press pressure was counted as a defective product.
- the sealing dimension L in the press process when manufacturing the spark plug is determined to be a sealing dimension L that is 0.5 mm smaller than the sealing dimension when any defective product occurs, and the defective product does not occur most. Long dimensions. Therefore, the spark plugs having various dimensions shown in Table 1 were tested with no. Each was manufactured with a different sealing dimension L. In addition, Test No. Ten spark plugs were produced for each test and tested, and the average value is shown in Table 1. *
- Table 1 Various dimensions in Table 1 were measured using a micro X-ray CT apparatus (TOSCANER-32250 ⁇ hd).
- the depth (D) of the concave portion is obtained by cutting the accommodated portion in a direction perpendicular to the axis O in the concave portion forming region, measuring the maximum diameter and the minimum diameter on the obtained cut surface, and measuring the measured value by 2. It was calculated by dividing. *
- the terminal metal fitting was manufactured with the low carbon steel, and the Vickers hardness was changed by adjusting the component.
- the Vickers hardness of the accommodated part at room temperature was measured in the vicinity of the center of the cut surface perpendicular to the axis O in the smooth part in accordance with JISZ2244. *
- the recessed portion formation region is shown in Test No. 1 to 51 and 53 to 67 were formed into a twill knurled shape by knurling. Test No. About 52, it formed in the screw shape by giving a screw process. *
- the spark plug included in the scope of the present invention was excellent in load life performance.
- the spark plug outside the scope of the present invention was inferior in load life performance.
Landscapes
- Spark Plugs (AREA)
Abstract
Description
(1)前記被収容部の軸線方向の長さHが35mm以上
(2)前記凹部形成領域の軸線方向の長さFが13mm以上
(3)前記被収容部は、その外周面に平滑部を有すること
(4)前記被収容部の先端における直径Aと前記先端における絶縁体の内径Bとの比(A/B)が、0.9≦A/B≦0.98
(5)前記被収容部を前記軸線方向に直交する方向に切断して得られる切断面の中心で測定したビッカース硬度が150Hv以上350Hv以下
前記凹部形成領域の少なくとも一部は、前記段差部に囲まれた空間に配置されている。
<3> 前記<1>又は前記<2>に記載のスパークプラグにおいて、前記平滑部の少なくとも一部は、前記第2内周面に囲まれた空間に配置されている。
<4> 前記<1>~前記<3>のいずれか1つに記載のスパークプラグにおいて、前記凹部形成領域における凹部の深さDが0.07mm以上である。
<5> 前記<1>~前記<4>のいずれか1つに記載のスパークプラグにおいて、前記内径Bが3.5mm以下である。
<6> 前記<2>~前記<5>のいずれか1つに記載のスパークプラグにおいて、前記被収容部における前記第2内周面に囲まれた部位の直径Kと、前記部位における前記第2内周面の内径Jとの差(J-K)の最大値(J-K)maxが0.05mm以上0.25mm以下である。
<7> 前記<1>~前記<6>のいずれか1つに記載のスパークプラグにおいて、前記平滑部の軸線方向長さ(H-F)が8mm以上である。
<8> 前記<1>~前記<7>のいずれか1つに記載のスパークプラグにおいて、前記比(A/B)が、0.93≦A/Bである。
<9> 前記<1>~前記<8>のいずれか1つに記載のスパークプラグにおいて、前記内径Bが2.9mm以下である。
<10> 前記<1>~前記<9>のいずれか1つに記載のスパークプラグにおいて、前記ビッカース硬度が200Hv以上320Hv以下である。
<11> 前記<2>~前記<10>のいずれか1つに記載のスパークプラグにおいて、前記軸孔内における前記端子金具と前記中心電極との間に、前記端子金具と前記中心電極とを電気的に接続する接続部を備え、
前記接続部は前記第1内周面に囲まれた空間のみに存在する。
(1)前記被収容部19の軸線O方向の長さHが35mm以上
(2)前記凹部形成領域31の軸線O方向の長さFが13mm以上
(3)前記被収容部19は、その外周面に平滑部32を有すること
(4)前記被収容部19の先端20における直径Aと前記先端20における絶縁体3の内径Bとの比(A/B)が、0.9≦A/B≦0.98
(5)前記被収容部19を前記軸線O方向に直交する方向に切断して得られる切断面の中心で測定したビッカース硬度が150Hv以上350Hv以下
被収容部を軸孔内に圧入する際に、抵抗体組成物にプレス圧を効果的に伝達することにより、密度の高い抵抗体を形成することができ、負荷寿命性能に優れる。
2 軸孔
3 絶縁体
4 中心電極
5 端子金具
6 接続部
7 主体金具
8 接地電極
9 ネジ部
10 タルク
11 パッキン
12 第3内周面
13 第2段差部
14 第1内周面
15 段差部
16 第2内周面
17 フランジ部
18 端子部
19 被収容部
20 先端
21 中胴部
22 胴部
23 第1段部
26 抵抗体
27 第一シール層
28 第二シール層
29,30 貴金属チップ
31 凹部形成領域
32 平滑部
Claims (11)
- 軸線方向に延びる軸孔を有する絶縁体と、
前記軸孔内に収容される被収容部を備え、前記被収容部の外周面に複数の凹部が形成された凹部形成領域を有する端子金具と、
前記絶縁体の先端側を収容して前記絶縁体を保持する主体金具と、を備えたスパークプラグにおいて、以下の(1)~(5)の条件を満たすことを特徴とするスパークプラグ。
(1)前記被収容部の軸線方向の長さHが35mm以上
(2)前記凹部形成領域の軸線方向の長さFが13mm以上
(3)前記被収容部は、その外周面に平滑部を有すること
(4)前記被収容部の先端における直径Aと前記先端における絶縁体の内径Bとの比(A/B)が、0.9≦A/B≦0.98
(5)前記被収容部を前記軸線方向に直交する方向に切断して得られる切断面の中心で測定したビッカース硬度が150Hv以上350Hv以下
- 前記絶縁体は、前記内径Bを有する第1内周面と、前記第1内周面及び前記主体金具より後端側に配置され、前記内径Bより径が大きい第2内周面と、前記第1内周面と前記第2内周面とを連結する段差部とを有し、
前記凹部形成領域の少なくとも一部は、前記段差部に囲まれた空間に配置されている請求項1に記載のスパークプラグ。
- 前記平滑部の少なくとも一部は、前記第2内周面に囲まれた空間に配置されている請求項1又は2に記載のスパークプラグ。
- 前記凹部形成領域における凹部の深さDが0.07mm以上である請求項1~3のいずれか一項に記載のスパークプラグ。
- 前記内径Bが3.5mm以下である請求項1~4のいずれか一項に記載のスパークプラグ。
- 前記被収容部における前記第2内周面に囲まれた部位の直径Kと、前記部位における前記第2内周面の内径Jとの差(J-K)の最大値(J-K)maxが0.05mm以上0.25mm以下である請求項2~5のいずれか一項に記載のスパークプラグ。
- 前記平滑部の軸線方向長さ(H-F)が8mm以上である請求項1~6のいずれか一項に記載のスパークプラグ。
- 前記比(A/B)が、0.93≦A/Bである請求項1~7のいずれか一項に記載のスパークプラグ。
- 前記内径Bが2.9mm以下である請求項1~8のいずれか一項に記載のスパークプラグ。
- 前記ビッカース硬度が200Hv以上320Hv以下である請求項1~9のいずれか一項に記載のスパークプラグ。
- 前記軸孔内における前記端子金具と前記中心電極との間に、前記端子金具と前記中心電極とを電気的に接続する接続部を備え、
前記接続部は前記第1内周面に囲まれた空間のみに存在することを特徴とする請求項2~10に記載のスパークプラグ。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020147026869A KR101632524B1 (ko) | 2012-03-28 | 2013-01-11 | 스파크 플러그 |
US14/388,092 US9035541B2 (en) | 2012-03-28 | 2013-01-11 | Spark plug |
EP13769791.8A EP2833492B1 (en) | 2012-03-28 | 2013-01-11 | Spark plug |
CN201380016865.0A CN104205535B (zh) | 2012-03-28 | 2013-01-11 | 火花塞 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012-075044 | 2012-03-28 | ||
JP2012075044A JP5393830B2 (ja) | 2012-03-28 | 2012-03-28 | スパークプラグ |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013145502A1 true WO2013145502A1 (ja) | 2013-10-03 |
Family
ID=49258831
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2013/000085 WO2013145502A1 (ja) | 2012-03-28 | 2013-01-11 | スパークプラグ |
Country Status (6)
Country | Link |
---|---|
US (1) | US9035541B2 (ja) |
EP (1) | EP2833492B1 (ja) |
JP (1) | JP5393830B2 (ja) |
KR (1) | KR101632524B1 (ja) |
CN (1) | CN104205535B (ja) |
WO (1) | WO2013145502A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016103353A (ja) * | 2014-11-27 | 2016-06-02 | 株式会社デンソー | 内燃機関用のスパークプラグ |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6054928B2 (ja) * | 2014-09-24 | 2016-12-27 | 日本特殊陶業株式会社 | スパークプラグ |
JP6169751B2 (ja) * | 2015-07-15 | 2017-07-26 | 日本特殊陶業株式会社 | スパークプラグ |
US9570889B2 (en) | 2015-07-15 | 2017-02-14 | Ngk Spark Plug Co., Ltd. | Spark plug |
WO2018098278A1 (en) | 2016-11-22 | 2018-05-31 | Ic Llc | Spark plug combustion ionization sensor |
CN111446627B (zh) * | 2020-03-10 | 2021-08-03 | 潍柴火炬科技股份有限公司 | 一种火花塞及其制作方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS628484A (ja) * | 1985-07-05 | 1987-01-16 | 日本特殊陶業株式会社 | 小型点火プラグ |
JP2001155839A (ja) * | 1999-11-30 | 2001-06-08 | Ngk Spark Plug Co Ltd | スパークプラグ |
JP2009245716A (ja) | 2008-03-31 | 2009-10-22 | Ngk Spark Plug Co Ltd | スパークプラグ |
WO2011033902A1 (ja) * | 2009-09-18 | 2011-03-24 | 日本特殊陶業株式会社 | スパークプラグ |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000215963A (ja) * | 1999-01-25 | 2000-08-04 | Ngk Spark Plug Co Ltd | スパ―クプラグの製造設備及びスパ―クプラグの製造方法 |
JP2009545856A (ja) * | 2006-08-03 | 2009-12-24 | フェデラル−モーグル コーポレイション | 一体型のシェルの高位置にねじ部を有するスパークプラグ |
JP2009259775A (ja) * | 2008-03-19 | 2009-11-05 | Ngk Spark Plug Co Ltd | スパークプラグ用絶縁体及びスパークプラグの製造方法 |
JP4648476B1 (ja) * | 2009-09-25 | 2011-03-09 | 日本特殊陶業株式会社 | 内燃機関用スパークプラグ |
-
2012
- 2012-03-28 JP JP2012075044A patent/JP5393830B2/ja active Active
-
2013
- 2013-01-11 WO PCT/JP2013/000085 patent/WO2013145502A1/ja active Application Filing
- 2013-01-11 KR KR1020147026869A patent/KR101632524B1/ko active IP Right Grant
- 2013-01-11 US US14/388,092 patent/US9035541B2/en active Active
- 2013-01-11 CN CN201380016865.0A patent/CN104205535B/zh active Active
- 2013-01-11 EP EP13769791.8A patent/EP2833492B1/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS628484A (ja) * | 1985-07-05 | 1987-01-16 | 日本特殊陶業株式会社 | 小型点火プラグ |
JP2001155839A (ja) * | 1999-11-30 | 2001-06-08 | Ngk Spark Plug Co Ltd | スパークプラグ |
JP2009245716A (ja) | 2008-03-31 | 2009-10-22 | Ngk Spark Plug Co Ltd | スパークプラグ |
WO2011033902A1 (ja) * | 2009-09-18 | 2011-03-24 | 日本特殊陶業株式会社 | スパークプラグ |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016103353A (ja) * | 2014-11-27 | 2016-06-02 | 株式会社デンソー | 内燃機関用のスパークプラグ |
Also Published As
Publication number | Publication date |
---|---|
EP2833492A1 (en) | 2015-02-04 |
CN104205535B (zh) | 2016-04-27 |
CN104205535A (zh) | 2014-12-10 |
JP2013206740A (ja) | 2013-10-07 |
EP2833492A4 (en) | 2015-11-11 |
US9035541B2 (en) | 2015-05-19 |
US20150061485A1 (en) | 2015-03-05 |
KR20140129286A (ko) | 2014-11-06 |
EP2833492B1 (en) | 2019-07-10 |
JP5393830B2 (ja) | 2014-01-22 |
KR101632524B1 (ko) | 2016-06-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5414896B2 (ja) | スパークプラグ | |
JP4928626B2 (ja) | スパークプラグ | |
JP5393830B2 (ja) | スパークプラグ | |
JP6482719B2 (ja) | 点火プラグ | |
JP5401606B2 (ja) | スパークプラグ及びその製造方法 | |
JP5298240B2 (ja) | スパークプラグ | |
JP5393881B2 (ja) | スパークプラグ | |
JP5401426B2 (ja) | スパークプラグの製造方法 | |
JP6054928B2 (ja) | スパークプラグ | |
CN111194511A (zh) | 火花塞 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 201380016865.0 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 13769791 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 20147026869 Country of ref document: KR Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14388092 Country of ref document: US Ref document number: 2013769791 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |