Abstract: In an ignition coil for an internal combustion engine, a column section and a notched section are provided in a side wall section of a case section of the ignition coil. A ventilation opening is formed in an up/down direction in the column section. The ventilation opening communicates with a ventilation passage formed between a sealing rubber and the case section and is open in an upper end section. A cover surrounding the column section and covering the upper end section is provided in the side wall section. A sealing section sealing the notched section is provided in the cover. The ignition coil has a filler resin that fills a space within the case section being in continuous contact with the sealing section and the side wall section and fixing the cover to the side wall section.

Abstract: An ignition coil for the internal combustion engine has a cylinder portion and a head portion. A pillar portion that forms a part of a ventilation passage that communicates inside and outside of a plug hole via a sealing member, and a cover portion that covers the pillar portion without blockading an upper opening of a ventilation opening of the pillar portion are formed on a side of the head portion.

Abstract: An axial end portion of a dielectric sheet, which is wound around a central core of an ignition coil, includes an axially projecting portion, which projects from an axial end surface of the central core positioned radially inward of primary and secondary coils in a case. An inner peripheral side axial end corner and an outer peripheral side axial end corner in the axially projecting portion are respectively formed into a blunt smooth round shape. Dielectric resin is filled in spaces in the case. Alternatively, the axially projecting portion may have a folded end portion, which includes a plurality of generally arcuate segments folded one after another on one circumferential side thereof.

Abstract: To provide a method for producing a ceramic porous material which has a high strength, though it has a high porosity, and which is excellent in permeability without dust generation. In a ceramic porous material having a three-dimensional mesh-like skeleton structure with a large number of substantially spherical adjacent cells communicating with each other via communication holes, the crystal particle size at the rim of each communication hole in the skeleton structure is provided substantially equal to the crystal particle size in the other parts.

Abstract: An ignition coil is disclosed. The ignition coil includes an insulative material, a body, and a head coupled to the body. A portion of the insulative material is included in the body, and a portion of the insulative material is included in the head. The head includes a casing, a flange for coupling to an engine case, and a connector adapted to be connected to an external device. The head also includes a conducting terminal with a connector pin, an exposed contact, and a connecting part. The connector pin is coupled to the connector, the exposed contact is coupled to the casing or the flange, and the connecting part couples the exposed contact and the connector pin. A portion of the connecting part is embedded in the insulative material, and wherein a remaining portion is embedded in the casing. A method of manufacturing the ignition coil is also disclosed.

Abstract: An ignition coil includes a cylindrical portion capable of being inserted into a plughole of an engine case. The cylindrical portion has a base end and a tip end, respectively, in an axial direction of the cylindrical portion. The cylindrical portion has an elastically deformable outer peripheral portion that engages with the plughole to fix an outer periphery of the cylindrical portion with respect thereto.

Abstract: A stick ignition coil apparatus for an ignition plug includes a primary coil arrangement, a secondary coil arrangement, a center core, a coil case, a high voltage terminal, a spring case and dielectric resin. The primary coil arrangement is located radially outward of the secondary coil arrangement, which is located radially outward of the center core. The coil case is located radially outward of the primary coil arrangement. The high voltage terminal is located at a distal end of the secondary coil arrangement. The spring case holds a spring. The dielectric resin is filled in a space defined radially inward of the coil case. An open end of the high voltage terminal is connected to an annular corner portion of a distal projecting portion of a secondary spool of the secondary coil.

Abstract: An axial end portion of a dielectric sheet, which is wound around a central core of an ignition coil, includes an axially projecting portion, which projects from an axial end surface of the central core positioned radially inward of primary and secondary coils in a case. An inner peripheral side axial end corner and an outer peripheral side axial end corner in the axially projecting portion are respectively formed into a blunt smooth round shape. Dielectric resin is filled in spaces in the case. Alternatively, the axially projecting portion may have a folded end portion, which includes a plurality of generally arcuate segments folded one after another on one circumferential side thereof.

Abstract: An ignition coil is disclosed. The ignition coil includes an insulative material, a body, and a head coupled to the body. A portion of the insulative material is included in the body, and a portion of the insulative material is included in the head. The head includes a casing, a flange for coupling to an engine case, and a connector adapted to be connected to an external device. The head also includes a conducting terminal with a connector pin, an exposed contact, and a connecting part. The connector pin is coupled to the connector, the exposed contact is coupled to the casing or the flange, and the connecting part couples the exposed contact and the connector pin. A portion of the connecting part is embedded in the insulative material, and wherein a remaining portion is embedded in the casing. A method of manufacturing the ignition coil is also disclosed.

Abstract: An ignition coil for an internal combustion engine has a first housing, a second housing, a holder, an insulating resin and a crack extension restrictor. The first housing encloses a center core, a primary coil and a secondary coil. The second housing has an install portion and a cylinder-shaped fitting portion fitted to a top cylindrical portion of the first housing. The holder is laid over top ends of the primary and secondary coils. The insulating resin is charged in an annular cavity defined at least by uppermost portions of the primary and secondary coils, the fitting portion and the holder and in contact with the fitting portion. The crack extension restrictor is formed by a part of the fitting portion and a part of the holder and disposed above the fitting faces of the fitting portion and the top end portion.

Abstract: An ignition coil includes a cylindrical portion capable of being inserted into a plughole of an engine case. The cylindrical portion has a base end and a tip end, respectively, in an axial direction of the cylindrical portion. The cylindrical portion has an elastically deformable outer peripheral portion that engages with the plughole to fix an outer periphery of the cylindrical portion with respect thereto.

Abstract: An ignition coil device has a secondary spool, a secondary coil wound around the secondary spool, an insulating resin material that is filled into spaces between the secondary windings, a primary spool, a primary coil wound around the primary spool, a connector that is arranged on one end side in an axial direction of these parts and has a connector terminal electrically connected to the primary coil and the secondary coil, and a resin insulting material for connector that is filled into the connector. The base material of the coil insulating resin material is the same as or different from the base material of the connector insulating resin material.

Abstract: A stick-type ignition coil have a central core, a cylindrical member, primary spool, primary coil, secondary spool, secondary coil, outer core and a resin insulator. The two longitudinal end corners and faces of the core are covered by respective buffer members. The inner circumferential corners of the outer core is supported by ring members. Some of the members disposed radially inside and other members disposed radially outside of the inside members are held slidably to each other in the ignition coil. The spools are made of resin containing a rubber in excess of 5 weight percent and reinforcing materials. The resin insulator contains a flexible material.

Abstract: A stick ignition coil apparatus for an ignition plug includes a primary coil arrangement, a secondary coil arrangement, a center core, a coil case, a high voltage terminal, a spring case and dielectric resin. The primary coil arrangement is located radially outward of the secondary coil arrangement, which is located radially outward of the center core. The coil case is located radially outward of the primary coil arrangement. The high voltage terminal is located at a distal end of the secondary coil arrangement. The spring case holds a spring. The dielectric resin is filled in a space defined radially inward of the coil case. An open end of the high voltage terminal is connected to an annular corner portion of a distal projecting portion of a secondary spool of the secondary coil.

Abstract: An ignition coil device is mounted in a plug hole member forming a plug hole with forming internal space with the plug hole member. The ignition coil device includes a primary spool, a primary coil wire that is wound around an outer surface of the primary spool. At least a given portion of the outer surface of the primary spool is formed of crystalline resin. Here, the given portion fluidly communicates with the internal space of the plug hole.

Abstract: A stick-shaped ignition coil includes a center core, a primary coil, a secondary coil, and a body case that are substantially coaxially arranged relative to each other. The ignition coil further includes an igniter, a head case, a holder, and an electrically insulative resin. The head case accommodates the igniter. The head case is provided to an upper end portion of the body case. The holder is arranged between the igniter and upper ends of all the center core, the primary coil, and the secondary coil. The electrically insulative resin is filled in a first space, which is formed among the center core, the primary coil, the secondary coil, the body case, and the holder. The holder has at least one resin flow hole, through which epoxy resin is supplied into the first space, and at least one vent hole, through which air in the first space is vented to an outside.

Abstract: An ignition coil device has a secondary spool, a secondary coil wound around the secondary spool, a coil insulating resin material that is impregnated into and cured in spaces between the windings of the secondary coil, a primary spool arranged on the secondary coil, a primary coil wound around the primary spool, and a high voltage tower that is arranged on one end side in the axial direction of these parts and is mounted with an ignition plug. At least one of two parts of the primary spool and the high voltage tower and the coil insulating resin material are integrally molded out of the same resin.

Abstract: An ignition coil for an internal combustion engine has a first housing, a second housing, a holder, an insulating resin and a crack extension restrictor. The first housing encloses a center core, a primary coil and a secondary coil. The second housing has an install portion and a cylinder-shaped fitting portion fitted to a top cylindrical portion of the first housing. The holder is laid over top ends of the primary and secondary coils. The insulating resin is charged in an annular cavity defined at least by uppermost portions of the primary and secondary coils, the fitting portion and the holder and in contact with the fitting portion. The crack extension restrictor is formed by a part of the fitting portion and a part of the holder and disposed above the fitting faces of the fitting portion and the top end portion.

Abstract: A stick-shaped ignition coil includes a center core, a primary coil, a secondary coil, and a body case that are substantially coaxially arranged relative to each other. The ignition coil further includes an igniter, a head case, a holder, and an electrically insulative resin. The head case accommodates the igniter. The head case is provided to an upper end portion of the body case. The holder is arranged between the igniter and upper ends of all the center core, the primary coil, and the secondary coil. The electrically insulative resin is filled in a first space, which is formed among the center core, the primary coil, the secondary coil, the body case, and the holder. The holder has at least one resin flow hole, through which epoxy resin is supplied into the first space, and at least one vent hole, through which air in the first space is vented to an outside.

Abstract: A stick-type ignition coil have a central core, a cylindrical member, primary spool, primary coil, secondary spool, secondary coil, outer core and a resin insulator. The two longitudinal end corners and faces of the core are covered by respective buffer members. The inner circumferential corners of the outer core is supported by ring members. Some of the members disposed radially inside and other members disposed radially outside of the inside members are held slidably to each other in the ignition coil. The spools are made of resin containing a rubber in excess of 5 weight percent and reinforcing materials. The resin insulator contains a flexible material.