公开(公告)号：JP2009021101A

公开(公告)日：2009-01-29

申请号：JP2007182930

申请日：2007-07-12

Applicant: Denso Corp ,  株式会社デンソー

Inventor： SATO YOSHIO

IPC: H01T13/20 ,  H01T21/02

CPC classification number: H01T21/06

Abstract: PROBLEM TO BE SOLVED: To provide a method for manufacturing a spark plug for an internal combustion engine, capable of carrying out efficiently adjustment of a spark discharge gap with high precision.
SOLUTION: The method is for manufacturing the spark plug, comprising a center electrode 11, an insulator, a housing, and a ground electrode 14. For adjusting the size of the spark discharge gap 10, the spark discharge gap 10 is set in a such a state that its size Gn is larger than a target value G0, and pushing action to push the ground electrode 14 toward the center electrode 11 by a pressure hammer is repeated. Control method for the pushing action by the pressure hammer is changed depending on whether the ground electrode 14 exists in a rough processing zone A or in a finishing processing zone B. When the ground electrode 14 is in the finishing processing zone B, pushing pressure quantity Kb by one-time pushing action is set to be smaller than when it is in the rough processing zone (Kb

Abstract translation: 解决的问题：提供一种制造用于内燃机的火花塞的方法，其能够高精度地有效地调节火花放电间隙。 解决方案：该方法用于制造包括中心电极11，绝缘体，壳体和接地电极14的火花塞。为了调整火花放电间隙10的尺寸，设置火花放电间隙10 在其尺寸Gn大于目标值G0的状态下，重复通过压力锤将接地电极14推向中心电极11的推动动作。 压力锤的推压动作的控制方法根据接地电极14是否存在于粗加工区域A或精加工区域B而变化。当接地电极14处于精加工区域B时，推压压力量 Kb通过一次推动动作被设定为小于在粗加工区域（Kb

公开(公告)号：JPH1098855A

公开(公告)日：1998-04-14

申请号：JP27180396

申请日：1996-09-20

Applicant: DENSO CORP

Inventor： MURAKAMI YOICHI ,  SATO YOSHIO ,  IBATA KOICHI

IPC: H01R39/20 ,  H01R39/26 ,  H02K13/00

Abstract: PROBLEM TO BE SOLVED: To suppress contact potential drop with a ring while enhancing durability by adding an additive having Mohs hardness in a specified range to a carbon brush. SOLUTION: A carbon brush sliding on a slip ring or a commutator principally comprising copper is formed by adding an additive having Mohs hardness in the range of 4-5 to a principal component of graphite. Preferably, potassium titanate, calcium fluoride, zinc oxide or barium fluoride is employed as the additive. Furthermore, whisker is preferably employed as the additive and potassium titanate whisker is employed more preferably. Content of such an additive is preferably set in the range of 0.05-5wt.% because the contact voltage drop increases significantly as shown in the Fig. while accelerating abrasion of the carbon brush and the ring when the content exceeds 5wt.%. According to the arrangement, the contact voltage drop can be suppressed while reducing abrasion of the carbon brush and the ring.