WO2011125306A1 - スパークプラグ - Google Patents
スパークプラグ Download PDFInfo
- Publication number
- WO2011125306A1 WO2011125306A1 PCT/JP2011/001832 JP2011001832W WO2011125306A1 WO 2011125306 A1 WO2011125306 A1 WO 2011125306A1 JP 2011001832 W JP2011001832 W JP 2011001832W WO 2011125306 A1 WO2011125306 A1 WO 2011125306A1
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- WIPO (PCT)
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- insulator
- spark plug
- point
- metal shell
- radius
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
- H01T13/36—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 spark plug.
- a spark plug disclosed in Patent Document 1 is known as a spark plug that improves the antifouling performance and realizes downsizing.
- the anti-fouling performance is improved and the size is reduced by reducing the gap formed between the metal shell and the insulator in the vicinity of the ignition part of the spark plug.
- Such a request is not limited to the spark plug in which the gap formed between the metal shell and the insulator is reduced, but is common to all spark plugs.
- the present invention has been made to solve the above-described conventional problems, and an object thereof is to provide a technique capable of improving the break strength of an insulator of a spark plug.
- the present invention can take the following forms or application examples in order to solve at least a part of the problems described above.
- a rod-shaped center electrode A rod-shaped center electrode; An insulator formed in a substantially cylindrical shape, having a through hole in the axial direction, and having the center electrode on the tip side of the through hole; A main body that is formed in a substantially cylindrical shape, holds the insulator in a state where the insulator is inserted, and a support portion formed on the outer periphery of the insulator is engaged with a step portion formed on the inner periphery of the insulator.
- a spark plug comprising: In a cross section including the axis, A connection point where the support portion of the insulator and the insulator body portion formed on the tip side from the support portion of the insulator are connected as a point A, The position of the innermost peripheral side of the portion where the support portion of the insulator and the packing are in contact with each other, and the virtual straight line extending from the innermost peripheral end of the stepped portion of the metal shell and parallel to the axis is the insulating material.
- the break strength of the insulator of the spark plug can be improved.
- the spark plug according to application example 1 The support portion of the insulator has a curved portion on the distal end side, and is connected to the insulator body portion through the curved portion, When the curvature radius of the curved portion is R, 0.6mm ⁇ R ⁇ 1.5mm A spark plug characterized by satisfying the relational expression of
- a screw diameter of an attachment screw portion formed on the outer peripheral surface of the metal shell is M12 or less.
- the present invention can be realized in various modes.
- it can be realized in the form of a spark plug manufacturing method and manufacturing apparatus.
- FIG. 2 is an enlarged cross-sectional view showing the vicinity of a support portion 15 of an insulator 10.
- FIG. It is an enlarged view which shows the support part 15b vicinity of the insulator 10b in the spark plug 100b of 2nd Embodiment.
- It is explanatory drawing which shows the result of the strength test of an insulator in a tabular form. It is a graph which shows the relationship between the creeping distance L and the intensity
- FIG. 1 is a partial cross-sectional view of a spark plug 100 as an embodiment of the present invention.
- the axial direction OD of the spark plug 100 will be described as the vertical direction in the drawing, the lower side will be described as the front end side, and the upper side will be described as the rear end side.
- the spark plug 100 includes an insulator 10, a metal shell 50, a center electrode 20, a ground electrode 30, and a terminal metal fitting 40.
- the center electrode 20 is held in the insulator 10 in a state extending in the axial direction OD.
- the insulator 10 functions as an insulator, and the metal shell 50 has the insulator 10 inserted therein.
- the terminal fitting 40 is provided at the rear end portion of the insulator 10.
- the insulator 10 is formed by firing alumina or the like, and has a cylindrical shape in which an axial hole 12 extending in the axial direction OD is formed at the axial center.
- a flange portion 19 having the largest outer diameter is formed substantially at the center in the axial direction OD, and a rear end side body portion 18 is formed on the rear end side (upper side in FIG. 1).
- a front end side body portion 17 having a smaller outer diameter than the rear end side body portion 18 is formed on the front end side from the flange portion 19 (lower side in FIG. 1), and further, on the front end side from the front end side body portion 17,
- a leg length portion 13 having an outer diameter smaller than that of the distal end side body portion 17 is formed.
- the long leg portion 13 is reduced in diameter toward the tip side, and is exposed to the combustion chamber when the spark plug 100 is attached to the engine head 200 of the internal combustion engine.
- a support portion 15 is formed between the leg length portion 13 and the distal end side body portion 17.
- the main metal fitting 50 is a cylindrical metal fitting made of a low carbon steel material, and fixes the spark plug 100 to the engine head 200 of the internal combustion engine.
- the metal shell 50 holds the insulator 10 inside, and the insulator 10 is surrounded by the metal shell 50 at a part from the rear end side body portion 18 to the leg length portion 13.
- the metal shell 50 includes a tool engaging portion 51 and a mounting screw portion 52.
- the tool engaging part 51 is a part into which a spark plug wrench (not shown) is fitted.
- the mounting screw portion 52 of the metal shell 50 is a portion where a screw thread is formed, and is screwed into a mounting screw hole 201 of the engine head 200 provided in the upper part of the internal combustion engine.
- the screw diameter of the attachment screw part 52 in this embodiment is M12.
- a bowl-shaped seal portion 54 is formed between the tool engaging portion 51 and the mounting screw portion 52 of the metal shell 50.
- An annular gasket 5 formed by bending a plate is fitted into a screw neck 59 between the attachment screw portion 52 and the seal portion 54.
- the gasket 5 is crushed and deformed between the seat surface 55 of the seal portion 54 and the opening peripheral edge portion 205 of the attachment screw hole 201. Due to the deformation of the gasket 5, the gap between the spark plug 100 and the engine head 200 is sealed, and airtight leakage in the engine through the mounting screw hole 201 is prevented.
- a thin caulking portion 53 is provided on the rear end side of the metal shell 50 from the tool engaging portion 51.
- a thin buckled portion 58 is provided between the seal portion 54 and the tool engaging portion 51, similarly to the caulking portion 53.
- annular ring members 6 and 7 are interposed between the inner peripheral surface of the metal shell 50 from the tool engaging portion 51 to the caulking portion 53 and the outer peripheral surface of the rear end side body portion 18 of the insulator 10.
- annular ring members 6 and 7 are interposed between the ring members 6 and 7.
- talc talc
- the support part 15 of the insulator 10 is supported by the step part 56 formed in the inner periphery of the metal shell 50, and the metal shell 50 and the insulator 10 are united.
- the airtightness between the metal shell 50 and the insulator 10 is maintained by the annular plate packing 8 interposed between the support portion 15 of the insulator 10 and the step portion 56 of the metal shell 50, and is burned. Gas outflow is prevented.
- the plate packing 8 is formed of a material having high thermal conductivity such as copper or aluminum. When the thermal conductivity of the plate packing 8 is high, the heat of the insulator 10 is efficiently transmitted to the step portion 56 of the metal shell 50, so that the heat extraction of the spark plug 100 is improved and the heat resistance can be improved.
- the buckling portion 58 is configured to bend outwardly and deform as the compression force is applied during caulking, and increases the airtightness in the metal shell 50 by earning a compression stroke of the talc 9. .
- a clearance CL having a predetermined dimension is provided between the front end side of the stepped portion 56 of the metal shell 50 and the insulator 10.
- the center electrode 20 is a rod-like electrode and has a structure in which a core material 25 is embedded in an electrode base material 21.
- the electrode base material 21 is made of nickel such as Inconel (trade name) 600 or 601 or an alloy containing nickel as a main component.
- the core material 25 is made of copper or an alloy containing copper as a main component, which is superior in thermal conductivity to the electrode base material 21.
- the center electrode 20 is produced by filling a core material 25 inside an electrode base material 21 formed in a bottomed cylindrical shape, and performing extrusion molding from the bottom side and stretching it.
- the core member 25 has a substantially constant outer diameter at the body portion, but a reduced diameter portion is formed at the distal end side.
- the center electrode 20 extends in the shaft hole 12 toward the rear end side, and is electrically connected to the terminal fitting 40 via the seal body 4 and the ceramic resistor 3.
- a high voltage cable (not shown) is connected to the terminal fitting 40 via a plug cap (not shown), and a high voltage is applied.
- the front end portion 22 of the center electrode 20 protrudes from the front end portion 11 of the insulator 10.
- a center electrode tip 90 is bonded to the tip of the tip portion 22 of the center electrode 20.
- the center electrode tip 90 has a substantially cylindrical shape extending in the axial direction OD, and is formed of a noble metal having a high melting point in order to improve the spark wear resistance.
- the center electrode tip 90 is made of, for example, iridium (Ir), one of the main components of platinum (Pt), rhodium (Rh), ruthenium (Ru), palladium (Pd), and rhenium (Re). It is formed of an Ir alloy to which two or more kinds are added.
- the ground electrode 30 is made of a metal having high corrosion resistance, and is made of, for example, a nickel alloy such as Inconel (trade name) 600 or 601.
- the base 32 of the ground electrode 30 is joined to the tip 57 of the metal shell 50 by welding.
- the ground electrode 30 is bent, and the tip 33 of the ground electrode 30 faces the center electrode tip 90.
- a ground electrode tip 95 is joined to the tip 33 of the ground electrode 30.
- the ground electrode chip 95 faces the center electrode chip 90, and a spark discharge gap G is formed between the ground electrode chip 95 and the center electrode chip 90.
- the ground electrode tip 95 can be formed of the same material as the center electrode tip 90.
- FIG. 2 is an enlarged sectional view showing the vicinity of the support portion 15 of the insulator 10.
- FIG. 2 shows a state where the spark plug 100 is cut along a cross section including the axis O.
- the lower side in the figure is the front end side, and the direction perpendicular to the axial direction OD is the radial direction.
- the metal shell 50 holds the insulator 10 in a state in which the support portion 15 formed on the outer periphery of the insulator 10 is locked to the step portion 56 formed on the inner periphery thereof.
- the annular plate packing 8 is in close contact between the support portion 15 on the outer periphery of the insulator 10 and the step portion 56 on the inner periphery of the metal shell 50.
- a connection point where the support portion 15 of the insulator 10 is connected to the insulator body portion 14 formed on the tip side of the support portion 15 of the insulator 10 is defined as a point A.
- a point located on the innermost side among the portions where the support portion 15 of the insulator 10 and the plate packing 8 are in contact is defined as a point B1.
- a point where an imaginary straight line VL extending from the innermost end of the step portion 56 of the metal shell 50 and parallel to the axis O intersects the support portion 15 of the insulator 10 is defined as a point B2.
- a point located on the outer peripheral side is referred to as a point B.
- the point B1 is the point B.
- L be the length of the path along the surface of the insulator 10 from the point A to the point B.
- the spark plug 100 preferably satisfies the following relational expression (1). 0.6 mm ⁇ L (1) The reason for this is as follows.
- L is also referred to as “creeping distance L”.
- Point A is a position where the support 15 of the insulator 10 and the insulator body 14 are connected, and the shape of the insulator 10 changes from the point A as a starting point. Therefore, when a radial force is applied to the insulator 10, the stress is concentrated at the position of the point A. Since the point B1 is a position where the support portion 15 and the plate packing 8 are in contact, a compressive stress is generated at the position of the point B1. When the point B2 is positioned on the outer peripheral side of the point B1, in other words, when the inner periphery of the plate packing 8 is positioned on the inner side of the virtual straight line VL, the point B2 is compressed from the metal shell shelf 56f. It will be a position to receive power. That is, of the points B 1 and B 2, the point B, which is a point located on the outer peripheral side, is a position where stress is most concentrated in the support portion 15.
- the creepage distance L is increased, in other words, if the positions of the points A and B where the stress concentrates are increased, the stress concentration can be suppressed, so that the breaking strength of the insulator 10 is improved. Can be made.
- the basis for defining the creepage distance L using the relational expression (1) will be described later.
- the support portion 15 of the insulator 10 has a curved portion 15r on the distal end side, and is connected to the insulator body portion 14 via the curved portion 15r.
- the spark plug 100 preferably satisfies the following relational expression (2). 0.6 mm ⁇ R ⁇ 1.5 mm (2)
- the reason for this is as follows. If the curvature radius R of the curved portion 15r is increased, the stress concentration at the point A can be suppressed, so that the strength of the insulator 10 can be improved. On the other hand, if the curvature radius R of the curved portion 15r is reduced, the airtightness between the plate packing 8 and the insulator 10 can be improved. Therefore, if the radius of curvature R of the curved portion 15r is within the range of the relational expression (2), the break strength of the insulator 10 can be improved while ensuring the airtightness between the plate packing 8 and the insulator 10. Can do.
- the basis for defining the radius of curvature R in the numerical range of the relational expression (2) will be described later.
- L2 be the length of one of the contact surfaces.
- the other contact surface of the two contact surfaces exists at a position symmetrical with respect to the axis O, but is not drawn in FIG.
- the spark plug 100 preferably satisfies the following relational expression (3). 0.3 mm ⁇ L2 (3) The reason for this is as follows.
- L2 is also referred to as “contact length L2”.
- the contact length L2 is increased, the contact area between the plate packing 8 and the insulator 10 is increased, so that the airtightness between the plate packing 8 and the insulator 10 can be improved. Therefore, if the contact length L2 is within the range of the relational expression (3), the airtightness between the plate packing 8 and the insulator 10 can be improved.
- the basis for defining the contact length L2 in the numerical range of the relational expression (3) will be described later.
- the radius of the inner periphery of the metal shell shelf 56f on the tip side of the step portion 56 of the metal shell 50 is r1
- the radius of the outer periphery of the insulator body 14 is r2.
- a value obtained by subtracting the radius r2 from the radius r1 is defined as a gap amount C.
- the spark plug 100 preferably satisfies the following relational expression (4).
- C ( r1-r2) ⁇ 0.5 mm (4) The reason for this is as follows.
- the gap amount C is 0.5 mm or less, intrusion of unburned gas can be suppressed, and the surface of the insulator in the gap can be suppressed from being stained, and the spark plug 100 can be prevented. Can be miniaturized.
- the creeping length L described above preferably satisfies the following relational expression (5).
- L ⁇ 0.9mm (5) The reason for this is as follows.
- the radius r2 of the outer periphery of the insulator body 14 decreases as the creepage distance L increases. Then, the strength of the insulator 10 starts to decrease due to the thickness of the insulator 10 becoming smaller. Therefore, if the creepage distance L is less than or equal to a predetermined value, the radius r2 of the outer periphery of the insulator body portion 14 is greater than or equal to a predetermined value, so that the breaking strength of the insulator 10 is reduced due to a decrease in the thickness of the insulator 10. Can be suppressed.
- the basis for defining the creepage distance L in the numerical range of the relational expression (5) will be described later.
- the breaking strength of the insulator 10 can be improved.
- the spark plug 100 does not have to satisfy all the relational expressions described above, and may satisfy any one or more of the relational expressions. However, if the spark plug 100 is configured to satisfy all the above-described conditions, the break strength of the insulator 10 can be improved more appropriately.
- FIG. 3 is an enlarged view showing the vicinity of the support portion 15b of the insulator 10b in the spark plug 100b of the second embodiment.
- the only difference from the first embodiment shown in FIG. 2 is that the shape of the insulator 10b is different, and the other configuration is the same as that of the first embodiment.
- the curved portion 15r is not formed on the distal end side of the support portion 15b of the insulator 10b, and the support portion 15b is configured linearly. If the spark plug 100b in which the curved portion 15r is not formed is configured to satisfy any one of the relational expressions excluding the relational expression (2), the breaking strength of the insulator 10b can be improved.
- FIG. 4 is an enlarged view showing the vicinity of the support portion 15c of the insulator 10c in the spark plug 100c of the third embodiment.
- the only difference from the first embodiment shown in FIG. 2 is that the shape of the insulator 10c is different from the shape of the plate packing 8, and the other configuration is the same as that of the first embodiment.
- the curved portion 15r is not formed on the distal end side of the support portion 15c of the insulator 10c, and the distal end side is bent from the point B1 of the support portion 15b.
- the radius r3 of the inner periphery of the plate packing 8 is equal to the radius r1 of the inner periphery of the metal shell shelf 56f.
- the point B is the point where the point B1 and the point B2 coincide with each other. If the spark plug 100c in which the curved portion 15r is not formed is configured to satisfy any one of the relational expressions excluding the relational expression (2), the breaking strength of the insulator 10c can be improved.
- D. Experimental example: D1. Experimental example on creepage distance L: In order to investigate the relationship between the strength of the insulator and the creepage distance L, a strength test was performed using a plurality of samples having different creepage distances L. In the sample used for this test, the creeping distance L was changed by changing the diameter ⁇ ( radius r 2 ⁇ 2) of the insulator body 14. In the strength test, a load was applied to the portion 1.5 mm from the tip of the insulator from the radial direction, and the load when the insulator was broken was measured. In this experimental example, a test was performed on spark plugs having two types of diameters, M14 (ISO metric screw) and M12. The same applies to other experimental examples shown below.
- M14 ISO metric screw
- FIG. 5 is an explanatory view showing the result of the strength test of the insulator in a tabular form.
- FIG. 6 is a graph showing the relationship between the creepage distance L (mm) and the strength (kN) of the insulator.
- the creepage distance L is preferably 0.5 mm or more, more preferably 0.6 mm or more, and particularly preferably 0.7 mm or more.
- the creepage distance L is preferably 1.0 mm or less, more preferably 0.9 mm or less, and particularly preferably 0.8 mm or less.
- FIG. 7 is an explanatory diagram showing the results of the strength test of the insulator in a table format.
- FIG. 8 is a graph showing the relationship between the creepage distance L (mm) and the strength (kN) of the insulator.
- the creepage distance L is preferably 0.5 mm or more, more preferably 0.6 mm or more, and particularly preferably 0.7 mm or more.
- the creeping distance L is preferably 1.0 mm or less, more preferably 0.9 mm or less, and particularly preferably 0.8 mm or less. I understand that.
- FIG. 9 is an explanatory view showing the results of the strength test and the airtightness determination test of the insulator in a tabular form.
- FIG. 10 is a graph showing the relationship between the radius of curvature R (mm) and the strength improvement rate (%) of the insulator.
- the strength of the insulator is improved if the radius of curvature R is increased.
- the curvature radius R is preferably 0.5 mm or more, more preferably 0.6 mm or more, and particularly preferably 1.0 mm or more.
- the radius of curvature R is set to a predetermined value or less, it can be understood that the deterioration of the airtightness can be suppressed. Specifically, it can be understood that the radius of curvature R is preferably less than 1.75 mm, and more preferably 1.50 mm or less.
- FIG. 11 is an explanatory diagram showing the results of the strength test and the airtightness determination test of the insulator in a table format.
- FIG. 12 is a graph showing the relationship between the radius of curvature R (mm) and the strength improvement rate (%) of the insulator.
- the curvature radius R is preferably 0.5 mm or more, more preferably 0.6 mm or more, and 1.0 mm or more. It can be seen that this is particularly preferred.
- the radius of curvature R is preferably less than 1.75 mm, and more preferably 1.50 mm or less.
- FIG. 13 is an explanatory diagram showing the results of an insulator strength test and an airtightness determination test in a tabular format.
- FIG. 14 is a graph showing the relationship between the contact length L2 (mm) and the strength (kN) of the insulator.
- the contact length L2 is shortened, the airtightness is lowered. Therefore, it can also be understood that if the contact length L2 is set to a predetermined value or more, it is possible to suppress a decrease in airtightness.
- the contact length L2 is preferably longer than 0.25 mm, and more preferably 0.30 mm or more.
- the diameter difference rd is preferably smaller than 0.32 mm, and more preferably 0.28 mm or less.
- the contact length L2 is preferably 0.50 mm or less, more preferably 0.45 mm or less, and particularly preferably 0.35 mm or less.
- the diameter difference rd is preferably 0.10 mm or more, more preferably 0.15 mm or more, and particularly preferably 0.23 mm or more.
- FIG. 15 is an explanatory diagram showing the results of the strength test and the airtightness determination test of the insulator in a table format.
- FIG. 16 is a graph showing the relationship between the contact length L2 (mm) and the strength (kN) of the insulator.
- the contact length L2 is preferably longer than 0.25 mm and more preferably 0.30 mm or more from the viewpoint of airtightness. Further, it can be understood that the diameter difference rd is preferably smaller than 0.32 mm, and more preferably 0.28 mm or less.
- the contact length L2 is preferably 0.50 mm or less, more preferably 0.45 mm or less, and particularly preferably 0.35 mm or less. it can. Further, it can be understood that the diameter difference rd is preferably 0.10 mm or more, more preferably 0.15 mm or more, and particularly preferably 0.23 mm or more.
- FIG. 17 is an enlarged view showing the vicinity of the support portion 15 of the insulator 10 in the spark plug 100d according to the modification.
- the shapes of the insulator 10 and the metal shell 50 of the spark plug 100d shown in FIG. 17 are the same as those of the embodiment shown in FIG. 2, and only the shape of the plate packing 8d is different.
- the radius r3 of the inner periphery of the plate packing 8 is larger than the radius r1 of the inner periphery of the metal shell shelf 56f.
- the radius r3 of the inner periphery of the plate packing 8d may be smaller than the radius r1. When the radius r3 is smaller than the radius r1, the creepage distance L is obtained with the point B2 as the point B.
- FIG. 18 is an enlarged view showing the vicinity of the support portion 15 of the insulator 10 in the spark plug 100e of a modified example.
- the difference from the first embodiment shown in FIG. 2 is that the outer periphery of the insulator body 14b is reduced as it approaches the tip side, and other configurations are the same as those of the first embodiment.
- the insulator body 14b faces the front end 56t of the metal shell shelf 56f.
- the gap radius C is calculated by defining the radius of the outer periphery of the portion to be defined as r2.
- the spark plug 100e satisfies the relational expression (4) as in the above embodiment.
- Intrusion of unburned gas into the gap formed between the metal shell shelf 56f and the insulator body 14b is caused by a gap formed between the tip 56t of the metal shell shelf 56f and the insulator body 14b. Affected by the size of Therefore, if the spark plug 100e satisfies the relational expression (4), the intrusion of unburned gas can be suppressed as in the above embodiment, and the surface of the insulator can be suppressed from being soiled. .
- the outer periphery of the insulator body 14b may have a shape that is reduced as it approaches the tip side.
- drum 14 is constant. Therefore, in the first to third embodiments, when the radius of the outer periphery of the portion of the insulator body 14 facing the tip of the metal shell shelf 56f is defined as r2, and the outer periphery of the insulator body 14 The value of the radius r2 is the same when the radius is defined as r2. That is, also in the first to third embodiments, the radius r2 can be defined as the radius of the outer periphery of the portion of the insulator body 14 that faces the tip of the metal shell shelf 56f.
- the outer periphery of the insulator body may be enlarged as it approaches the tip side. That is, the outer periphery of the insulator body may be deformed as it approaches the tip side.
- the insulator body can be defined as a portion of the insulator having a surface facing the metal shell shelf 56f, and the facing surface is a surface inclined within ⁇ 5 degrees from the axial direction OD. Can be defined as
- FIG. 19 is an enlarged view showing the vicinity of the support portion 15 of the insulator 10 in the spark plug 100f according to the modification.
- the difference from the second embodiment shown in FIG. 3 is that the outer periphery of the insulator body 14b is reduced as it approaches the tip, and the other configuration is the same as that of the second embodiment.
- the definition of the radius r2 can be made the same as in the case of the spark plug 100e shown in FIG. It is preferable that the spark plug 100f satisfies the relational expression (4) as in the above embodiment.
- FIG. 20 is an enlarged view showing the vicinity of the support portion 15 of the insulator 10 in the spark plug 100g according to a modification.
- the difference from the third embodiment shown in FIG. 4 is that the outer periphery of the insulator body 14b is reduced as it approaches the tip side, and the other configuration is the same as that of the third embodiment.
- the definition of the radius r2 can be made the same as in the case of the spark plug 100e shown in FIG. It is preferable that the spark plug 100g satisfies the relational expression (4) as in the above embodiment.
- Terminal fitting 50 Metal fitting 51 ... Tool engaging portion 52 ... Mounting screw portion 53 ... Clamping portion 54 ... Seal portion 55 ... Seat surface 56 ... Step part 56f ... Metal fitting shelf part 56t ... Tip 57 ... Tip part 58 ... Buckling part 59 ... Screw neck 90 ... Center electrode tip 95 ... Ground electrode tip 100 ... Spark Lug 100b ... Spark plug 100c ... Spark plug 100d ... Spark plug 200 ... Engine head 201 ... Mounting screw hole 205 ... Opening peripheral edge G ... Spark discharge gap O ... Axis line L ... Creeping distance R ... Curvature radius L2 ... Contact length OD ... Axial direction CL ... Clearance VL ... Virtual straight line
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Abstract
Description
棒状の中心電極と、
略筒状に形成され、軸線方向に貫通孔を有するとともに、前記中心電極を前記貫通孔の先端側に備えた絶縁体と、
略筒状に形成され、前記絶縁体を内挿し、自身の内周に形成された段部に前記絶縁体の外周に形成された支持部を係止した状態で、前記絶縁体を保持する主体金具と、
前記絶縁体の外周の支持部と前記主体金具の内周の段部との間に密着して介在する環状のパッキンと、
を備えたスパークプラグであって、
前記軸線を含む断面において、
前記絶縁体の支持部と該絶縁体の支持部より先端側に形成された絶縁体胴部とが接続する接続点を点Aとし、
前記絶縁体の支持部と前記パッキンとが接触する部位のうち最も内周側の位置と、前記主体金具の段部の最も内周側の端部から延び前記軸線と平行な仮想直線が前記絶縁体の支持部と交差する位置とを比較して、より外周側の位置を点Bとし、
前記点Aから前記点Bまでの前記絶縁体の表面に沿った経路の長さをLとしたとき、
0.6mm≦L
の関係式を満たすことを特徴とする
スパークプラグ。
適用例1に記載のスパークプラグであって、
前記絶縁体の支持部は、先端側に曲線部を有し、該曲線部を介して前記絶縁体胴部と接続しており、
前記曲線部の曲率半径をRとしたとき、
0.6mm≦R≦1.5mm
の関係式を満たすことを特徴とする
スパークプラグ。
適用例1または2に記載のスパークプラグであって、
前記絶縁体の支持部と前記パッキンとが接触する部位のうち最も内周側に位置する点B1は、前記仮想直線よりも外周側に位置し、
前記軸線を含む断面において、
前記絶縁体の支持部と前記パッキンとが接触している2つの接触面のうちの一方の接触面の長さをL2としたとき、
0.3mm≦L2
の関係式を満たすことを特徴とする
スパークプラグ。
適用例1ないし3のいずれか一項に記載のスパークプラグであって、
前記主体金具の段部よりも先端側の主体金具棚部の内周の半径をr1とし、
前記絶縁体胴部のうち、前記主体金具棚部の先端に対向する部分の外周の半径をr2としたとき、
r1-r2≦0.5mm
の関係式を満たすことを特徴とする
スパークプラグ。
適用例1ないし4のいずれか一項に記載のスパークプラグであって、
L≦0.9mm
の関係式を満たすことを特徴とする
スパークプラグ。
適用例1ないし5のいずれか一項に記載のスパークプラグであって、
前記スパークプラグを被取付け部材に取り付けるために、前記主体金具の外周面に形成された取付ねじ部のねじ径は、M12以下であることを特徴とするスパークプラグ。
A.第1実施形態:
B.第2実施形態:
C.第3実施形態:
D.実験例:
D1.沿面距離Lに関する実験例:
D2.曲率半径Rに関する実験例:
D3.接触長さL2に関する実験例:
E.変形例:
図1は、本発明の一実施形態としてのスパークプラグ100の部分断面図である。なお、図1において、スパークプラグ100の軸線方向ODを図面における上下方向とし、下側をスパークプラグ100の先端側、上側を後端側として説明する。
座屈部58は、加締めの際に、圧縮力の付加に伴い外向きに撓み変形するように構成されており、タルク9の圧縮ストロークを稼いで主体金具50内の気密性を高めている。なお、主体金具50の段部56よりも先端側と絶縁碍子10との間には、所定寸法のクリアランスCLが設けられている。
0.6mm≦L ・(1)
この理由は以下のとおりである。なお、以下ではLを「沿面距離L」とも呼ぶ。
0.6mm≦R≦1.5mm ・(2)
0.3mm≦L2 ・(3)
この理由は以下のとおりである。なお、以下ではL2を「接触長さL2」とも呼ぶ。
C(=r1-r2)≦0.5mm ・(4)
この理由は以下のとおりである。
L≦0.9mm ・(5)
この理由は以下のとおりである。
図3は、第2実施形態のスパークプラグ100bにおける絶縁碍子10bの支持部15b付近を示す拡大図である。図2に示した第1実施形態との違いは、絶縁碍子10bの形状が異なっている点だけであり、他の構成は第1実施形態と同じである。この絶縁碍子10bの支持部15bの先端側には、曲線部15rが形成されておらず、支持部15bは、直線的に構成されている。曲線部15rが形成されていないスパークプラグ100bに対しては、上記関係式(2)を除くいずれかの関係式を満たすように構成すれば、絶縁碍子10bの折損強度を向上させることができる。
図4は、第3実施形態のスパークプラグ100cにおける絶縁碍子10cの支持部15c付近を示す拡大図である。図2に示した第1実施形態との違いは、絶縁碍子10cの形状と板パッキン8の形状が異なっている点だけであり、他の構成は第1実施形態と同じである。この絶縁碍子10cの支持部15cの先端側には、曲線部15rが形成されておらず、支持部15bの点B1より先端側は屈曲している。また、板パッキン8の内周の半径r3は、主体金具棚部56fの内周の半径r1と等しくなっている。したがって、点B1と点B2とが一致した点が点Bとなっている。曲線部15rが形成されていないスパークプラグ100cに対しては、上記関係式(2)を除くいずれかの関係式を満たすように構成すれば、絶縁碍子10cの折損強度を向上させることができる。
D1.沿面距離Lに関する実験例:
絶縁碍子の強度と沿面距離Lとの関係を調べるため、沿面距離Lの異なる複数のサンプルを用いて強度試験を行なった。この試験に用いるサンプルでは、絶縁碍子胴部14の直径φ(=半径r2・2)を変化させることにより、沿面距離Lを変化させた。強度試験では、絶縁碍子の先端から1.5mmの部分に対して径方向から荷重をかけ、絶縁碍子が折損したときの荷重を計測した。なお、本実験例では、M14(ISOメートルねじ)とM12の2種類の径のスパークプラグに対して試験を行なった。以下に示す他の実験例においても同様である。
絶縁碍子の強度と曲線部15rの曲率半径Rとの関係を調べるため、曲率半径Rの異なる複数のサンプルを用いて強度試験を行なった。さらに、これらのサンプルを用いて、板パッキン8と絶縁碍子10との間の気密性が確保されているか否かを判定する気密判定試験も行なった。
絶縁碍子の強度と接触長さL2との関係を調べるため、接触長さL2の異なる複数のサンプルを用いて強度試験を行なった。さらに、これらのサンプルを用いて、板パッキン8と絶縁碍子10との間の気密性が確保されているか否かを判定する気密判定試験も行なった。強度試験及び気密判定試験の試験方法は、上述した試験方法と同じである。
なお、この発明は上記の実施例や実施形態に限られるものではなく、その要旨を逸脱しない範囲において種々の態様において実施することが可能であり、例えば次のような変形も可能である。
4…シール体
5…ガスケット
6…リング部材
8…板パッキン
8d…板パッキン
9…タルク
10…絶縁碍子
10b…絶縁碍子
10c…絶縁碍子
11…先端部
12…軸孔
13…脚長部
14…絶縁碍子胴部
15…支持部
15b…支持部
15c…支持部
15r…曲線部
17…先端側胴部
18…後端側胴部
19…鍔部
20…中心電極
21…電極母材
22…先端部
25…芯材
30…接地電極
32…基部
33…先端部
40…端子金具
50…主体金具
51…工具係合部
52…取付ねじ部
53…加締部
54…シール部
55…座面
56…段部
56f…主体金具棚部
56t…先端
57…先端部
58…座屈部
59…ねじ首
90…中心電極チップ
95…接地電極チップ
100…スパークプラグ
100b…スパークプラグ
100c…スパークプラグ
100d…スパークプラグ
200…エンジンヘッド
201…取付ねじ孔
205…開口周縁部
G…火花放電ギャップ
O…軸線
L…沿面距離
R…曲率半径
L2…接触長さ
OD…軸線方向
CL…クリアランス
VL…仮想直線
Claims (6)
- 棒状の中心電極と、
略筒状に形成され、軸線方向に貫通孔を有するとともに、前記中心電極を前記貫通孔の先端側に備えた絶縁体と、
略筒状に形成され、前記絶縁体を内挿し、自身の内周に形成された段部に前記絶縁体の外周に形成された支持部を係止した状態で、前記絶縁体を保持する主体金具と、
前記絶縁体の外周の支持部と前記主体金具の内周の段部との間に密着して介在する環状のパッキンと、
を備えたスパークプラグであって、
前記軸線を含む断面において、
前記絶縁体の支持部と該絶縁体の支持部より先端側に形成された絶縁体胴部とが接続する接続点を点Aとし、
前記絶縁体の支持部と前記パッキンとが接触する部位のうち最も内周側の位置と、前記主体金具の段部の最も内周側の端部から延び前記軸線と平行な仮想直線が前記絶縁体の支持部と交差する位置とを比較して、より外周側の位置を点Bとし、
前記点Aから前記点Bまでの前記絶縁体の表面に沿った経路の長さをLとしたとき、
0.6mm≦L
の関係式を満たすことを特徴とする
スパークプラグ。 - 請求項1に記載のスパークプラグであって、
前記絶縁体の支持部は、先端側に曲線部を有し、該曲線部を介して前記絶縁体胴部と接続しており、
前記曲線部の曲率半径をRとしたとき、
0.6mm≦R≦1.5mm
の関係式を満たすことを特徴とする
スパークプラグ。 - 請求項1または2に記載のスパークプラグであって、
前記絶縁体の支持部と前記パッキンとが接触する部位のうち最も内周側に位置する点B1は、前記仮想直線よりも外周側に位置し、
前記軸線を含む断面において、
前記絶縁体の支持部と前記パッキンとが接触している2つの接触面のうちの一方の接触面の長さをL2としたとき、
0.3mm≦L2
の関係式を満たすことを特徴とする
スパークプラグ。 - 請求項1ないし3のいずれか一項に記載のスパークプラグであって、
前記主体金具の段部よりも先端側の主体金具棚部の内周の半径をr1とし、
前記絶縁体胴部のうち、前記主体金具棚部の先端に対向する部分の外周の半径をr2としたとき、
r1-r2≦0.5mm
の関係式を満たすことを特徴とする
スパークプラグ。 - 請求項1ないし4のいずれか一項に記載のスパークプラグであって、
L≦0.9mm
の関係式を満たすことを特徴とする
スパークプラグ。 - 請求項1ないし5のいずれか一項に記載のスパークプラグであって、
前記スパークプラグを被取付け部材に取り付けるために、前記主体金具の外周面に形成された取付ねじ部のねじ径は、M12以下であることを特徴とするスパークプラグ。
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JPWO2011125306A1 (ja) | 2013-07-08 |
KR20130004359A (ko) | 2013-01-09 |
EP2555354B1 (en) | 2019-05-22 |
CN102859816B (zh) | 2014-11-12 |
EP2555354A1 (en) | 2013-02-06 |
KR101397776B1 (ko) | 2014-05-20 |
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