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公开(公告)号：EP2679903B1
公开(公告)日：2018-10-10
申请号：EP12748904.5
申请日：2012-02-07
CPC分类号： F23Q7/001 , F02D35/023 , F02P19/028 , F23Q2007/002 , F23Q2007/005 , G01L23/22
摘要： Disclosed is the structure of a glow plug with a combustion pressure sensor which includes a heater unit which is reduced in diameter stepwise. In the structure, the area of a member connecting the heater unit to a housing is made sufficiently large, so that the detection accuracy of the pressure sensor is improved. The structure can further improve the detection accuracy of the pressure sensor. The glow plug 100 includes a substantially cylindrical housing extending in an axial direction; a rod-shaped heater unit that has a front end protruding from the front end of the housing and is movable in the axial direction; a connecting member that connects the heater unit to the housing within the housing and allows the heater unit to move in the axial direction; and a pressure sensor that detects pressure received by the heater unit. The heater unit has a large-diameter portion formed at the rear end thereof and a small-diameter portion formed frontward of the large-diameter portion and having a diameter smaller than the diameter of the large-diameter portion. The connecting member connects the small-diameter portion of the heater unit to the housing within the housing.
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公开(公告)号：EP3382830A1
公开(公告)日：2018-10-03
申请号：EP18162849.6
申请日：2018-03-20
发明人： Usami, Kohei , Yamada, Yuichi
摘要： A spark plug includes: a center electrode (50); an insulator (11) having a through hole (29, 44) that surrounds at least a part of the center electrode (50); a metal shell (60) that holds the insulator (11) from an outer peripheral side thereof and that is substantially tubular, and the metal shell (60) includes a shelf portion (67) that projects radially inward. The insulator (11) includes an engagement portion (24) that is engaged with the shelf portion (67) from the front side, and a front end portion (42) that is present at the front side with respect to a front end of the metal shell (60). At least a part of the front end portion (42) has an outer diameter larger than an inner diameter of the metal shell (60) at the front side with respect to the shelf portion (67). The insulator (11) has, in a portion including a front end of the insulator (11), a diameter-enlarged portion (47) at which a diameter of the through hole (44) increases and which is spaced apart from an outer peripheral surface of the center electrode (50).
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公开(公告)号：EP3045818B1
公开(公告)日：2018-10-03
申请号：EP15202745.4
申请日：2015-12-24
发明人： OTSUBO, Masanori , KAN, Yohei
IPC分类号： F23Q7/00
CPC分类号： F23Q7/001 , F23Q2007/002
摘要： [Objective] To accurately detect ion current generated as a result of combustion in an internal combustion engine. [Means for Solution] An ignition assist device 10 includes a housing 12; a ceramic member 11 disposed in the housing 12 and having a distal end portion 11a exposed from the housing 12; and a heat-generating element 20 and an ion detection electrode 30 which are embedded in the ceramic member 11 in such a manner as to be electrically insulated from each other. The ignition assist device 10 further includes an ion detection terminal portion 31 for applying an ion detection voltage to the ion detection electrode 30, and two heat-generating-element terminal portions 21 and 22 disposed at such positions as to not come into contact with the internal combustion engine and adapted to supply electricity to the heat-generating element 20.
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公开(公告)号：EP3148022B1
公开(公告)日：2018-09-19
申请号：EP16190408.1
申请日：2016-09-23
发明人： YOKOYAMA, Yutaka , TANAKA, Kuniharu , TAKAOKA, Katsuya , KONDO, Shun , ARAKI, Nobuyoshi , KON, Toshiki , YOSHIDA, Haruki , ISASA, Jumpei , KURONO, Hirokazu , UEGAKI, Hironori , SAJI, Toshimasa , NOMURA, Yusuke
摘要： A spark plug 1 including an insulator 3 containing not less than 92 mass % and not greater than 96 mass % of Al component in terms of oxide, wherein the insulator is formed from an alumina sintered body comprising alumina crystal and a grain boundary phase present between crystal grains of the alumina crystal. Assuming that mass contents of an Si component, an Mg component, a Ba component, and a Ca component in terms of oxide are represented by M SiO2 , M MgO , M BaO , and M CaO , respectively, and a sum of M SiO2 , M MgO , M BaO , and M CaO is represented by Mt, the grain boundary phase contains these components so as to satisfy conditions (1) to (4) as follows: (1) 0.17 ‰¤ M SiO2 /Mt ‰¤ 0.47; (2) 0.005 ‰¤ M MgO /Mt ‰¤ 0.07; (3) 0.29 ‰¤ M BaO /Mt ‰¤ 0.77; (4) 0.03 ‰¤ M CaO /Mt ‰¤ 0.19.
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公开(公告)号：EP2259394B1
公开(公告)日：2018-09-05
申请号：EP09723991.7
申请日：2009-03-26
发明人： KURONO, Hirokazu , HONDA, Toshitaka , TAKEUCHI, Hiroki , MITSUOKA, Takeshi , TANAKA, Kuniharu , MIYATA, Kazunari , TAKAOKA, Katsuya
IPC分类号： H01T13/38 , C04B35/111 , H01T13/20 , H01T13/36
CPC分类号： H01T13/38 , C04B35/111 , C04B35/6261 , C04B2235/3206 , C04B2235/3208 , C04B2235/3213 , C04B2235/3215 , C04B2235/3222 , C04B2235/3224 , C04B2235/3227 , C04B2235/3229 , C04B2235/3418 , C04B2235/5436 , C04B2235/656 , C04B2235/6567 , C04B2235/77 , C04B2235/786 , C04B2235/80 , C04B2235/96 , H01T21/02
摘要： This invention has an object to provide a spark plug exhibiting high withstand voltage characteristics and high strength at high temperature, formed by an alumina-based sintered body prepared with excellent processability and high productivity, and a method for manufacturing the spark plug. This invention relates to a spark plug 1 including an insulator 3, wherein the insulator 3 includes a dense alumina-based sintered body having an average crystal particle diameter of 1.50 µm or more, and the alumina-based sintered body contains Si, a Group 2 element component containing Ba and a Group 2 element other than those, and a rare earth element component, such that a ratio of a content S of the Si component to a total content of the content S and a content A of the Group 2 element component is 0.60 or more, and a method for manufacturing the spark plug 1 prepared through a grinding-shaping process in which the insulator 3 is ground before burning to shape the same.
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公开(公告)号：EP2733797B1
公开(公告)日：2018-08-29
申请号：EP12810850.3
申请日：2012-04-17
发明人： SUZUKI, Akira
CPC分类号： F16J15/061 , F16J15/0881 , H01L2224/32245 , H01L2224/48091 , H01L2224/48227 , H01L2224/48247 , H01L2224/49107 , H01L2224/73265 , H01L2224/8592 , H01T13/08 , H01L2924/00014 , H01L2924/00
摘要： Provided is a technique which realizes securement of gas-tightness and suppression of loosening of a gasket. A spark plug includes a tubular metallic shell extending in an axial direction, and an annular gasket provided around the metallic shell. The gasket is solid and contains copper as a main component and nickel in an amount of 0.1 wt.% or more. The gasket has a maximum thickness of 0.4 mm or more in the axial direction, and the gasket has a Vickers hardness of 30 HV to 150 HV.
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公开(公告)号：EP2333916B1
公开(公告)日：2018-08-29
申请号：EP09819266.9
申请日：2009-10-09
发明人： KATO, Tomoaki
摘要： [Objective] To reduce or prevent the generation of abnormal discharge across a gap other than the regular gap between a center electrode and a ground electrode in a spark plug which has the center electrode formed by performing laser welding along the circumference of a joint surface between a center electrode base metal and a noble metal tip in excess of full circumference. [Means for Solution] When G represents a spark gap and A represents a shortest gap between a laser weld bead and a line drawn in parallel with the axis X of a metallic shell along the inner surface of a proximal end portion of a ground electrode which faces a center electrode, G and A establish a dimensional relation A ‰¤ 3G. As viewed in the direction of the axis X from the front end of the noble metal tip 1, a straight line S1 which connects the center of the noble metal tip 1 and the circumferential center of a proximal end 52 of the ground electrode 51 and a straight line S2 which connects the center of the noble metal tip 1 and a vertex 8 of a protrusion 7 formed at a final end portion 6e of a bead 6 formed by circumferential laser welding form an angle ¸ of 45 degrees. Since the protrusion 7 of the bead is the angle ¸ away from the ground electrode 51, an abnormal discharge is unlikely to be generated.
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公开(公告)号：EP1961941B1
公开(公告)日：2018-08-29
申请号：EP08002666.9
申请日：2008-02-13
发明人： Fukagai, Reina , Ieda, Norikazu , Tanaka, Masahiro , Inagaki, Hiroshi , Hirata, Masaki , Suzuki, Takahiro
CPC分类号： F02D41/1495 , F02D41/1456 , F02D41/1474 , F02D41/1494 , F02D2041/1432
摘要： A gas sensor diagnostic method includes the steps of counting the reversal number of times that a target air-fuel ratio for an air-fuel mixture to be supplied to an internal combustion engine reverses from a rich side to a lean side or from the lean side to the rich side through a specific air-fuel ratio defined as a boundary of the rich and lean sides; obtaining a detection signal of a gas sensor at constant time intervals during a diagnosis period between a timing when the count for the reversal number is started and a timing when the reversal number reaches a predetermined number; calculating a moderated signal by applying a moderation calculation using a predetermined moderation coefficient to the obtained detection signal; calculating a deviation between the obtained detection signal and the calculated moderated signal; and determining whether the gas sensor is in an abnormal state or not on the basis of the deviation.
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公开(公告)号：EP3355423A1
公开(公告)日：2018-08-01
申请号：EP18150452.3
申请日：2018-01-05
摘要： A spark plug having a tip (22) formed of an alloy containing Pt. The tip (22) contains not less than 6 mass% of Rh, at least one element selected from an R group consisting of Rh, Re, Ir, Ru, W, Mo, and Nb, not less than 5 mass% of Ni, and at least one element selected from an N group consisting of Ni, Co, Fe, and Cu. The tip (22) contains Rh most among the elements of the R group, and contains Ni most among the elements of the N group. The total of contents of Pt, Rh, and Ni is not less than 91 mass%, and the total of contents of Pt, the R group, and the N group is not less than 95 mass%. A value obtained by dividing the content of the R group by the content of the N group is not less than 0.7 and not greater than 8.
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公开(公告)号：EP2360797B1
公开(公告)日：2018-07-11
申请号：EP09824581.4
申请日：2009-11-02
发明人： KAMEDA, Hiroyuki , KATO, Tomoaki
CPC分类号： H01T13/467 , H01T13/32
摘要： An object is to provide a spark plug which can improve startability and sooting-up prevention performance of an internal combustion engine in a low temperature environment. Means for solution is a spark plug 1 which includes an electrode 5, an insulator 2, a metallic shell 3, a main ground electrode 30, and at least two auxiliary ground electrodes 40. The spark plug 1 is characterized in that (i) the main ground electrode 30 is disposed so that its distal end portion faces a side surface of a front end portion of the center electrode 5 and forms a main spark discharge gap 38 between the distal end portion and the front end portion of the center electrode 5; (ii) each of the auxiliary ground electrodes 40 is disposed so that a portion of its distal end portion end surface faces an outer circumferential surface of a front end portion of the insulator 2; and (iii) a total area S satisfies an expression S/Av
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