公开(公告)号：US08531094B2

公开(公告)日：2013-09-10

申请号：US12595732

申请日：2008-09-10

申请人： Akira Suzuki ,  Tomoaki Kato ,  Mamoru Musasa ,  Jiro Kyuno

发明人： Akira Suzuki ,  Tomoaki Kato ,  Mamoru Musasa ,  Jiro Kyuno

IPC分类号： H01T13/20 ,  H01T13/14

CPC分类号： H01T13/20 ,  H01T13/14 ,  H01T13/34 ,  H01T13/39

摘要： The present invention provides a spark plug that includes a center electrode extending in an axial direction, a ceramic insulator having an axial hole formed in the axial direction to retain the center electrode in a front side of the axial hole and thereby form an assembly unit of the center electrode and the ceramic insulator, a metal shell surrounding an outer circumference of the ceramic insulator to retain therein the assembly unit, and a ground electrode having one end portion joined to a front end face of the metal shell and the other end portion facing the center electrode to define a spark gap therebetween, wherein the spark plug satisfies the following conditions: H≧1 mm, Vc≦17 mm3 and Ra≧1.0×103 K/(m·W) where H is a length by which the ceramic insulator protrudes toward the front from the front end face of the metal shell in the axial direction; Vc is a volume of part of the ceramic insulator extending within a range of 2 mm from a front end of the ceramic insulator toward the rear in the axial direction; and Ra is a thermal resistance per unit length, excluding air space, at 20° C. at a cross section of the assembly unit taken perpendicular to the axial direction at a position 2 mm away from the front end of the ceramic insulator.

摘要翻译： 本发明提供一种火花塞，其包括沿轴向延伸的中心电极，具有沿轴向形成的轴向孔的陶瓷绝缘体，以将中心电极保持在轴向孔的前侧，从而形成组装单元 所述中心电极和所述陶瓷绝缘体，围绕所述陶瓷绝缘体的外周的金属壳，以将所述组装单元保持在其中;以及接地电极，所述接地电极具有接合到所述金属壳的前端面的一个端部， 所述中心电极在其间限定火花隙，其中所述火花塞满足以下条件：H> = 1mm，Vc @ 17mm 3，Ra> = 1.0×103K /（m·W）其中H是长度， 陶瓷绝缘体从金属壳的前端面沿轴向向前突出; Vc是陶瓷绝缘体的一部分的体积，其距离陶瓷绝缘体的前端在轴向方向的后端2mm的范围内延伸; 并且Ra在距离陶瓷绝缘体的前端2mm的位置垂直于轴向的组装单元的截面处，在20℃下，每单位长度的热阻，不包括空气空间。

公开(公告)号：US08395307B2

公开(公告)日：2013-03-12

申请号：US13142893

申请日：2009-12-07

申请人： Akira Suzuki ,  Tomoaki Kato ,  Mamoru Musasa ,  Toshitaka Honda

发明人： Akira Suzuki ,  Tomoaki Kato ,  Mamoru Musasa ,  Toshitaka Honda

IPC分类号： H01T13/20

CPC分类号： H01T13/14

摘要： A spark plug which provides reliable prevention of adhesion and accumulation of carbon on an insulator, includes a center electrode extending in the direction of an axis CL1, a ceramic insulator having an axial hole which extends in the direction of the axis CL1 and in which the center electrode is provided, a cylindrical metallic shell provided externally of the outer circumference of the insulator and having a support portion formed on the inner circumferential surface thereof, and a ground electrode extending from a front end portion of the metallic shell. The insulator has a stepped portion supported by the support portion of the metallic shell, and a leg portion formed forward of the stepped portion. A space SP formed between the leg portion of the insulator and the inner circumferential surface of the metallic shell has a volume of 100 mm3 to 300 mm3 inclusive.

摘要翻译： 提供可靠地防止绝缘体上的碳的粘附和积聚的火花塞包括沿轴线CL1的方向延伸的中心电极，具有沿轴线CL1的方向延伸的轴向孔的陶瓷绝缘体，其中， 中心电极，设置在绝缘体的外周外侧的具有形成在其内周面上的支撑部分的圆筒形金属壳体和从金属壳体的前端部延伸的接地电极。 绝缘体具有由金属壳的支撑部分支撑的阶梯部分和在阶梯部分的前方形成的脚部。 在绝缘体的腿部和金属壳的内周面之间形成的空间SP的体积为100mm 3〜300mm 3（以下）。

公开(公告)号：US20100117507A1

公开(公告)日：2010-05-13

申请号：US12595732

申请日：2008-09-10

申请人： Akira Suzuki ,  Tomoaki Kato ,  Mamoru Musasa ,  Jiro Kyuno

发明人： Akira Suzuki ,  Tomoaki Kato ,  Mamoru Musasa ,  Jiro Kyuno

IPC分类号： H01T13/20

CPC分类号： H01T13/20 ,  H01T13/14 ,  H01T13/34 ,  H01T13/39

摘要： The present invention provides a spark plug that includes a center electrode extending in an axial direction, a ceramic insulator having an axial hole formed in the axial direction to retain the center electrode in a front side of the axial hole and thereby form an assembly unit of the center electrode and the ceramic insulator, a metal shell surrounding an outer circumference of the ceramic insulator to retain therein the assembly unit, and a ground electrode having one end portion joined to a front end face of the metal shell and the other end portion facing the center electrode to define a spark gap therebetween, wherein the spark plug satisfies the following conditions: H≧1 mm, Vc≦17 mm3 and Ra≧1.0×10−3 m·K/W where H is a length by which the ceramic insulator protrudes toward the front from the front end face of the metal shell in the axial direction; Vc is a volume of part of the ceramic insulator extending within a range of 2 mm from a front end of the ceramic insulator toward the rear in the axial direction; and Ra is a thermal resistance per unit length, excluding air space, at 20° C. at a cross section of the assembly unit taken perpendicular to the axial direction at a position 2 mm away from the front end of the ceramic insulator.

摘要翻译： 本发明提供一种火花塞，其包括沿轴向延伸的中心电极，具有沿轴向形成的轴向孔的陶瓷绝缘体，以将中心电极保持在轴向孔的前侧，从而形成组装单元 所述中心电极和所述陶瓷绝缘体，围绕所述陶瓷绝缘体的外周的金属壳，以将所述组装单元保持在其中;以及接地电极，所述接地电极具有接合到所述金属壳的前端面的一个端部， 所述中心电极在其间形成火花隙，其中，所述火花塞满足以下条件：H≥1mm，Vc＆nlE; 17mm3，Ra≥1.0×10-3m·K / W其中，H是陶瓷 绝缘体从金属壳体的前端面沿轴向向前突出; Vc是陶瓷绝缘体的一部分的体积，其距离陶瓷绝缘体的前端在轴向方向的后端2mm的范围内延伸; 并且Ra在距离陶瓷绝缘体的前端2mm的位置垂直于轴向的组装单元的截面处，在20℃下，每单位长度的热阻，不包括空气空间。

公开(公告)号：US07477007B2

公开(公告)日：2009-01-13

申请号：US11236589

申请日：2005-09-28

申请人： Akira Suzuki ,  Tomoaki Kato

发明人： Akira Suzuki ,  Tomoaki Kato

IPC分类号： H01T13/20

CPC分类号： H01T13/39

摘要： A spark plug configured such that a noble-metal tip is welded to each of a front end portion of a center electrode and a distal end portion of a ground electrode. The noble-metal tip of the center electrode or the ground electrode, whichever has a weld metal zone having a greater projected area where an electrode base metal and a metal of the noble metal tip are fused together, is made greater in exposed length of the noble-metal tip. In a preferred embodiment, the projected area of the weld metal zone and the exposed length of the noble-metal tip on the ground electrode side are made greater than those on the center electrode side.

摘要翻译： 一种火花塞，其构造成使得贵金属尖端焊接到中心电极的前端部和接地电极的前端部中的每一个。 中心电极或接地电极的贵金属尖端，无论哪个具有较大投影面积的焊接金属区域，其中电极母材金属和贵金属电极头的金属熔合在一起，使其的暴露长度更大 贵金属尖端。 在优选实施例中，焊接金属区域的投影面积和接地电极侧的贵金属电极头的露出长度大于中心电极侧的高度。

公开(公告)号：US08215277B2

公开(公告)日：2012-07-10

申请号：US12933745

申请日：2009-03-18

申请人： Akira Suzuki ,  Tomoaki Kato

发明人： Akira Suzuki ,  Tomoaki Kato

IPC分类号： H01T13/20

CPC分类号： H01T13/14

摘要： A spark plug is provided capable of speedily burn off carbon adhered on an insulator. With this spark plug, in order to improve the temperature rise performance of a front end side of an insulator 10, an amount of protrusion H (mm) of the insulator 10, a front-end side volume Vi (mm3) of the insulator 10, and a front-end side volume Vc (mm3) of a center electrode 20 are respectively defined. In consequence, it is possible to improve the recovery property of carbon fouling while retaining the voltage resistance of the insulator 10 and the durability of the center electrode 20. In addition, since the recovery property of carbon fouling improves, it is possible to prevent the occurrence of side sparks generated from the center electrode 20 to a metal shell 50 along the insulator 10, thereby making it possible to stably ensure proper ignition of an air-fuel mixture.

摘要翻译： 提供了能够快速燃烧粘附在绝缘体上的碳的火花塞。 利用该火花塞，为了提高绝缘体10的前端侧的温度上升性能，绝缘体10的突起H（mm）的量，绝缘体10的前端侧容积Vi（mm3） ，并且分别限定中心电极20的前端侧容积Vc（mm3）。 因此，可以在保持绝缘体10的耐电压性和中心电极20的耐久性的同时保持碳污染的恢复性能。另外，由于碳污染的回收性能提高，因此可以防止 发生从中心电极20沿着绝缘体10向金属壳50产生的侧面火花，从而可以稳定地确保空气 - 燃料混合物的正确点燃。

公开(公告)号：US08188640B2

公开(公告)日：2012-05-29

申请号：US12889123

申请日：2010-09-23

申请人： Akira Suzuki ,  Tomoaki Kato

发明人： Akira Suzuki ,  Tomoaki Kato

IPC分类号： H01T13/20 ,  H01T13/00

CPC分类号： H01T13/20 ,  H01T13/39 ,  H01T21/02

摘要： A method of producing a spark plug includes reducing the diameter of a center electrode while maintaining the heat dissipation property of the center electrode. A columnar member in which an outer skin member and a core member having a high thermal conductivity are clad, and which is columnarly extended, are configured by extrusion molding into a state where the thickness of the outer skin member is substantially uniform. A flange portion and a tip end portion are formed in the columnar member to obtain an electrode intermediate member. In a middle trunk portion of the electrode intermediate member, the thickness of the outer skin member is maintained. Then, the surface of the middle trunk portion is cut or polished to reduce the thickness, whereby the diameter of a center electrode is reduced while maintaining the outer diameter of the core member.

摘要翻译： 一种制造火花塞的方法包括在保持中心电极的散热性的同时减小中心电极的直径。 通过挤出成型将外皮部件和导热性高的芯部件包覆并被柱状延伸的柱状部件构成为外皮部件的厚度基本均匀的状态。 在该柱状部件上形成凸缘部和前端部，得到电极中间部件。 在电极中间部件的中间部分中，保持外皮部件的厚度。 然后，中间主体部分的表面被切割或抛光以减小厚度，由此中心电极的直径减小，同时保持芯部件的外径。

公开(公告)号：US08143773B2

公开(公告)日：2012-03-27

申请号：US12933192

申请日：2009-03-17

申请人： Akira Suzuki ,  Tomoaki Kato ,  Mamoru Musasa

发明人： Akira Suzuki ,  Tomoaki Kato ,  Mamoru Musasa

IPC分类号： H01T13/00

CPC分类号： H01T13/38

摘要： When an insulator of a spark plug receives an external force in a bending direction perpendicular to an axis at a rear end side body portion, a position C where the insulator is supported by a crimping portion via a packing acts as a fulcrum, and a stress is applied between the position C and a position B where the insulator is supported by a ledge portion via a packing. When an insulator is designed in which the balance of size and modulus of section is adjusted so that τA which denotes a proof strength against bending between a rear end position A of the insulator and the position C and τB which denotes a proof strength against bending between the position B and the position C satisfy 0.71≦τA/τB≦1.27, cracks can be prevented.

摘要翻译： 当火花塞的绝缘体在与后端侧主体部分的轴线垂直的弯曲方向上接收到外力时，绝缘体经由填料被压接部支撑的位置C用作支点，并且应力 施加在位置C和位置B之间，其中绝缘体通过包装被凸缘部分支撑。 当设计绝缘体时，其中调节截面尺寸和模量的平衡，使得表示绝缘体的后端位置A与位置C之间的弯曲的抵抗强度的τA和表示在绝缘体的位置C之间的抗弯强度的抗弯强度的τB 位置B和位置C满足0.71＆nlE;τA/τB＆nlE; 1.27，可以防止裂纹。

公开(公告)号：US20110018422A1

公开(公告)日：2011-01-27

申请号：US12933192

申请日：2009-03-17

申请人： Akira Suzuki ,  Tomoaki Kato ,  Mamoru Musasa

发明人： Akira Suzuki ,  Tomoaki Kato ,  Mamoru Musasa

IPC分类号： H01T13/02

CPC分类号： H01T13/38

摘要： When an insulator of a spark plug receives an external force in a bending direction perpendicular to an axis at a rear end side body portion, a position C where the insulator is supported by a crimping portion via a packing acts as a fulcrum, and a stress is applied between the position C and a position B where the insulator is supported by a ledge portion via a packing. When an insulator is designed in which the balance of size and modulus of section is adjusted so that τA which denotes a proof strength against bending between a rear end position A of the insulator and the position C and τB which denotes a proof strength against bending between the position B and the position C satisfy 0.71≦τA/τB≦1.27, cracks can be prevented.

摘要翻译： 当火花塞的绝缘体在与后端侧主体部分的轴线垂直的弯曲方向上接收到外力时，绝缘体经由填料被压接部支撑的位置C用作支点，并且应力 施加在位置C和位置B之间，其中绝缘体通过包装被凸缘部分支撑。 当设计绝缘体时，其中调节截面尺寸和模量的平衡，使得表示绝缘体的后端位置A与位置C之间的弯曲的抵抗强度的τA和表示在绝缘体的后端位置A之间的弯曲的抗弯强度的τB 位置B和位置C满足0.71＆nlE;τA/τB＆nlE; 1.27，可以防止裂纹。

公开(公告)号：US20110017163A1

公开(公告)日：2011-01-27

申请号：US12933745

申请日：2009-03-18

申请人： Akira Suzuki ,  Tomoaki Kato

发明人： Akira Suzuki ,  Tomoaki Kato

IPC分类号： H01T13/20

CPC分类号： H01T13/14

摘要： A spark plug is provided capable of speedily burn off carbon adhered on an insulator. With this spark plug, in order to improve the temperature rise performance of a front end side of an insulator 10, an amount of protrusion H (mm) of the insulator 10, a front-end side volume Vi (mm3) of the insulator 10, and a front-end side volume Vc (mm3) of a center electrode 20 are respectively defined. In consequence, it is possible to improve the recovery property of carbon fouling while retaining the voltage resistance of the insulator 10 and the durability of the center electrode 20. In addition, since the recovery property of carbon fouling improves, it is possible to prevent the occurrence of side sparks generated from the center electrode 20 to a metal shell 50 along the insulator 10, thereby making it possible to stably ensure proper ignition of an air-fuel mixture.

摘要翻译： 提供了能够快速燃烧粘附在绝缘体上的碳的火花塞。 利用该火花塞，为了提高绝缘体10的前端侧的温度上升性能，绝缘体10的突起H（mm）的量，绝缘体10的前端侧容积Vi（mm3） ，并且分别限定中心电极20的前端侧容积Vc（mm3）。 因此，可以在保持绝缘体10的耐电压性和中心电极20的耐久性的同时保持碳污染的恢复性能。另外，由于碳污染的回收性能提高，因此可以防止 发生从中心电极20沿着绝缘体10向金属壳50产生的侧面火花，从而可以稳定地确保空气 - 燃料混合物的正确点燃。

公开(公告)号：US20100019644A1

公开(公告)日：2010-01-28

申请号：US12516227

申请日：2008-09-10

申请人： Reimon Fukuzawa ,  Tomoaki Kato ,  Akira Suzuki

发明人： Reimon Fukuzawa ,  Tomoaki Kato ,  Akira Suzuki

IPC分类号： H01T13/20

CPC分类号： H01T13/32 ,  H01T13/16 ,  H01T13/39

摘要： A spark plug of the present invention is designed as a small-diameter spark plug, which includes: a metal shell having a mounting thread formed with a nominal diameter of M12 or smaller based on JIS standard; a ground electrode consisting a first structural member extending from one end toward the other end thereof and at least one ith structural member (i=2, 3, 4, 5) laminated to cover an outer surface of the first structural member, the length of protrusion of the other end of the ground electrode from a front end face of the metal shell being 4.5 mm or larger, the ground electrode having a bent portion formed between the one end to the other end thereof with a curvature radius of 2.3 mm or smaller; and an electrode tip joined to the other end of the ground electrode at a position facing the front end of the center electrode and having a protrusion length of 0.5 mm or larger and a cross sectional area of 0.20 to 1.13 mm2. It is possible to increase the heat radiation ability of the ground electrode and prevent the ground electrode from decreasing in metal fatigue strength by selecting the materials of the structural members of the ground electrode in such a manner as to control the total thermal conductivity X of the ground electrode as expressed by the formula [1] to 35 W/(m·K) or higher at 20° C. [ Formula   6 ] X = volume   of   first   structural   member volume   of   ground   electrode × thermal   conductivity   of   first   structural   member + ∑ i = 2 n  ( volume   of   ith   structural   member volume   of   ground   electrode × thermal   conductivity   of   ith   structural   member ) ( 1 )