-
公开(公告)号：DE19719937A1
公开(公告)日：1997-11-20
申请号：DE19719937
申请日：1997-05-13
Applicant: DENSO CORP
Inventor： OSAMURA HIRONORI , ABE NOBUO
Abstract: A spark plug has a central electrode (3) surrounded by an insulator (2) leaving a free point. The holder (10 surrounds the insulator leaving a free region. The earth electrode 94) fastened to the holder has a section opposite the point of the central electrode to form a discharge gap (6). There is a little plate (15) of iridium alloy on at least one of the two ends of the electrodes. The other component of the alloy is a metal with a higher oxidation resistance than iridium and which forms a fixed solution with it in all respects. The little plates are made by drawing a heated block of the alloy into a rod of a chosen cross-section and then chopping it into slices.
-
公开(公告)号：GB2306196A
公开(公告)日：1997-04-30
申请号：GB9621237
申请日：1996-10-11
Applicant: DENSO CORP
Inventor： ABE NOBUO , OSAMURA HIRONORI
Abstract: The tip of the centre electrode (3) or earth electrodes (4) is melted at the predetermined regions where the noble metal chips (5) is to be fixed. Then the chip (5) is pressed into the melted region of the electrode so as to form a protruding portion (3c, 4c) along outer periphery of the chip (5). Next, the chip (5) is welded by laser light (L) through the protruding portion (3c, 4c). This method reduces thermal stress in the weld while maintaining sufficient connecting strength, reduces the size of the chip and simplifies the assembly process. The material of the chip may be Ir, Ir-Pt, Ir-Pt-Ni, Ir-Rh, Ir-W, Ir-Al, Ir-Si, Ir-Y, or Ir-Y 2 O 3 and the electrode may be made from a Ni- group heat-resisting alloy containing Fe and Cr.
-
公开(公告)号：DE19650728B4
公开(公告)日：2006-02-02
申请号：DE19650728
申请日：1996-12-06
Applicant: DENSO CORP
Inventor： OSAMURA HIRONORI
Abstract: A spark plug with a plug screw outer diameter D of 10 mm-12 mm, wherein the length A of the discharge gap 6, the width B of the gas volume 7, the protruding length C of the insulator 2 with respect to the fitting piece 1, the diameter F of the center electrode 3, the end diameter G of the noble metal tip 51 and the protruding height H of the noble metal tip 51 with respect to the center electrode 3 are within the following ranges: 0.9 mm
-
公开(公告)号：DE69924344T2
公开(公告)日：2006-01-12
申请号：DE69924344
申请日：1999-12-03
Applicant: DENSO CORP
Inventor： ISHINO YASUTAKE , OSAMURA HIRONORI , YATOU MAKOTO
-
公开(公告)号：GB2381042B
公开(公告)日：2005-10-19
申请号：GB0219863
申请日：2002-08-27
Applicant: DENSO CORP
Inventor： HORI TSUNONOBU , MIZUTANI AKIHIKO , OSAMURA HIRONORI , TAKAMURA KOXO
Abstract: An improved structure of a spark plug which provides higher durability of a joint of a noble metal chip to an electrode such as a center or a ground electrode. The joint is formed by laser welding. A fused portion made of materials of the noble metal chip and the electrode fused together by the laser welding is formed in the joint so that it may continue over at least half a circumference of a contact between the noble metal chip and the electrode without interfaces of welds, thereby enhancing the activity of the fused portion as a thermal stress absorber. A welding method is also provided.
-
Patent Agency Ranking
公开(公告)号：DE19623795C2
公开(公告)日：2003-09-25
申请号：DE19623795
申请日：1996-06-14
Applicant: DENSO CORP
Inventor： OSAMURA HIRONORI , ABE NOBUO , KANAO KEIJI , HORIBE KENJI
Abstract: To improve the consumption resistance and lifetime, a spark plug for an internal combustion engine comprises: an insulation porcelain having a throughhole; a center electrode held at one end of the throughhole; a housing holding the insulation porcelain; a ground electrode disposed at an front end of the housing and facing the center electrode; a spark gap defined by the center electrode and the ground electrode; and at least one of the center electrode and the ground electrode having a noble metal chip bonded to a discharging spot of an front end thereof, wherein the noble metal chip consisting of an Ir-Rh alloy contains Rh in an amount of from 1 wt % to 60 wt %.
-
公开(公告)号：GB2381042A
公开(公告)日：2003-04-23
申请号：GB0219863
申请日：2002-08-27
Applicant: DENSO CORP
Inventor： HORI TSUNONOBU , MIZUTANI AKIHIKO , OSAMURA HIRONORI , TAKAMURA KOXO
Abstract: A spark plug comprises first and second electrodes with an air gap between and a noble metal chip 2a is joined to at least one of the electrodes 2 by laser welding. The fused portion 10 between the noble metal chip and the electrode continues over at least half of the seam between the two parts in a circumferential direction and weld interfaces or joints (201), usually formed when there is more than one weld, do not exist. A method of laser welding a noble metal member to an electrode is also disclosed, where several laser beams (100) are irradiated simultaneously over at least half of the circumferential contact of the two parts, and another method employs a single annular laser beam (111) over the same area.
-
公开(公告)号：DE10239075A1
公开(公告)日：2003-04-17
申请号：DE10239075
申请日：2002-08-26
Applicant: DENSO CORP
Inventor： HORI TSUNENOBU , MIZUTANI AKIHIKO , OSAMURA HIRONORI , TAKAMURA KOZO
Abstract: An improved structure of a spark plug which provides higher durability of a joint of a noble metal chip to an electrode such as a center or a ground electrode. The joint is formed by laser welding. A fused portion made of materials of the noble metal chip and the electrode fused together by the laser welding is formed in the joint so that it may continue over at least half a circumference of a contact between the noble metal chip and the electrode without interfaces of welds, thereby enhancing the activity of the fused portion as a thermal stress absorber. A welding method is also provided.
-
公开(公告)号：GB2354550A
公开(公告)日：2001-03-28
申请号：GB0023205
申请日：2000-09-21
Applicant: DENSO CORP
Inventor： HANASHI KEN , ISHINO YASUTAKE , OSAMURA HIRONORI
Abstract: The spark plug has a center electrode 4, a first ground electrode 5, a pair of second ground electrodes 6, 7, an insulator 3 and a metal housing 2. A first discharge gap is constituted between a front end of the center electrode 4 and a front side of the first ground electrode 5; a second discharge gap is constituted between a front end of a second electrode 6, 7 and a front side of the center electrode 4. Respective dimensional relationships of A to H are defined where A is the width of the first discharge gap; B is a radial thickness of the front end of the insulator; C is a shortest distance between the insulator and the front end of the second electrode 6; D is a shortest distance between the base point of the center electrode 4 (where a diametrically reduced portion is integrally connected to a base portion) and the inside front end of the insulator; E and F are axial lengths from the inside front end of the insulator to the base of the centre electrode and the front end of the second electrode, respectively; G is an axial thickness of the front end of the second electrode, and (H) is a distance of spark discharge creeping along the end surface of the insulator. Resistance to fouling is increased; an air-gap discharge occurs at the first gap; when the insulator is fouled, a surface discharge occurs at the second gap to burn deposited carbon with limited channeling.
-
公开(公告)号：CA2291351A1
公开(公告)日：2000-06-04
申请号：CA2291351
申请日：1999-12-01
Applicant: DENSO CORP
Inventor： ISHINO YASUTAKE , OSAMURA HIRONORI , YATOU MAKOTO
Abstract: In a spark plug having a center electrode, first and second ground electrodes, an insulator and a metal housing, a first discharge gap is constituted between a front end of the center electrode and a front side of the first ground electrode and a second discharge gap is constituted between a front end of the second electrode and a front side of the center electrode. Respective dimensional relationships of A, B, C, H, F and L1 are defined where A is a distance of the first discharge gap, B is a shortest distance between the front end of the second ground electrode and the insulator, C is an axial length from a leading end of the metal housing and a front end of the insulator, H is an axial length from the front end of the insulator and the front end of the center electrode, F is an axial length from the front end of the insulator to the front end edge of the second electrode and L1 is a shortest axial length from the leading end of the metal housing to the front end of the second ground electrode.
-
-
-
-
-
-
-
-
-
Search Results
30
records
(took 0.024 seconds)
