公开(公告)号：US10367335B2

公开(公告)日：2019-07-30

申请号：US16091144

申请日：2017-01-13

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yusuke Kawashima ,  Hiroyuki Hazama

IPC: H01T13/32 ,  H01T21/02 ,  H01T13/39

Abstract: Disclosed is a spark plug having a ground electrode in which a weld zone is formed a tip and electrode base. The weld zone has: a back region exposed at an opposite surface of the electrode base; a joint region at which the tip is joined; and a connection region connects the joint region and the back region without being exposed at side surfaces of the electrode base. In a cross section of the ground electrode taken through the side surfaces of the electrode base along a plane passing through the centers of the top and bottom surfaces of the tip, a value of a width of the top surface of the tip being divided by a width of the facing surface of the electrode base is greater than 0.3, and a maximum width of the connection region is larger than a width of the back region.

公开(公告)号：US20170326765A1

公开(公告)日：2017-11-16

申请号：US15534529

申请日：2015-09-23

Applicant: NGK Spark Plug Co., Ltd.

Inventor： Hirokazu Kurono ,  Hironori Uegaki ,  Toshitaka Honda ,  Hiroyuki Hazama ,  Kuniharu Tanaka ,  Hiroyuki Kawaji

IPC: B29C45/14 ,  H01T21/02 ,  H01T13/39 ,  B28B1/24 ,  H01T13/34

CPC classification number: B29C45/14655 ,  B28B1/24 ,  B28B7/0038 ,  B28B7/18 ,  B28B7/346 ,  B28B13/06 ,  H01T13/20 ,  H01T13/34 ,  H01T13/39 ,  H01T21/02

Abstract: An employed rear mold is comprised of a plurality of mold pieces. The plurality of mold pieces include a first mold piece which forms a first partial internal surface of the internal surface of the rear mold along the entire circumference of the internal surface, and a second mold piece which is located axially forward of the first mold piece and forms a second partial internal surface of the internal surface of the rear mold along the entire circumference of the internal surface. Releasing the molded body includes starting to move the first mold piece rearward in relation to a rear molded portion, and, subsequently to starting to move the first mold piece, starting to move the second mold piece rearward in relation to the rear molded portion, thereby disassembling the rear mold into the plurality of mold pieces.

公开(公告)号：US10751923B2

公开(公告)日：2020-08-25

申请号：US15534529

申请日：2015-09-23

Applicant: NGK Spark Plug Co., Ltd.

Inventor： Hirokazu Kurono ,  Hironori Uegaki ,  Toshitaka Honda ,  Hiroyuki Hazama ,  Kuniharu Tanaka ,  Hiroyuki Kawaji

IPC: B29C45/14 ,  H01T21/02 ,  H01T13/20 ,  B28B7/34 ,  B28B13/06 ,  B28B7/18 ,  B28B7/00 ,  B28B1/24 ,  H01T13/34 ,  H01T13/39

Abstract: An employed rear mold is comprised of a plurality of mold pieces. The plurality of mold pieces include a first mold piece which forms a first partial internal surface of the internal surface of the rear mold along the entire circumference of the internal surface, and a second mold piece which is located axially forward of the first mold piece and forms a second partial internal surface of the internal surface of the rear mold along the entire circumference of the internal surface. Releasing the molded body includes starting to move the first mold piece rearward in relation to a rear molded portion, and, subsequently to starting to move the first mold piece, starting to move the second mold piece rearward in relation to the rear molded portion, thereby disassembling the rear mold into the plurality of mold pieces.