IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0060456
(2008-04-01)
|
등록번호 |
US-7849843
(2011-02-10)
|
우선권정보 |
JP-2007-117830(2007-04-27); JP-2007-117833(2007-04-27); JP-2007-117834(2007-04-27) |
발명자
/ 주소 |
- Kojima, Masami
- Tauchi, Takashi
- Morimoto, Takeshi
- Iwami, Atsushi
- Satoh, Yoshitaka
- Matsubayashi, Shuichi
- Hirayama, Ikuo
|
출원인 / 주소 |
- Denso Corporation
- Toyo Denso Kabushiki Kaisha
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
9 인용 특허 :
14 |
초록
▼
An ignition coil is equipped with a sparkplug of an engine. The ignition coil includes a coil portion, a tower portion, and a plug cap. The coil portion includes a coil case accommodating a primary and secondary coils being coaxial with each other. The coil portion has an end connected with the plug
An ignition coil is equipped with a sparkplug of an engine. The ignition coil includes a coil portion, a tower portion, and a plug cap. The coil portion includes a coil case accommodating a primary and secondary coils being coaxial with each other. The coil portion has an end connected with the plug cap via the tower portion. The plug cap is press-fitted with the sparkplug. The coil case has an outer periphery from which a flange portion projects radially outward in a flange-projecting direction. The tower cylinder portion has a tower axis substantially in parallel with a coil axis of the primary and secondary coils. The tower axis is offset from the coil axis in a tower-offset direction. The tower-offset direction is substantially the same as the flange-projecting direction.
대표청구항
▼
What is claimed is: 1. An ignition coil configured to be equipped with a first sparkplug of an engine, the ignition coil comprising: a coil portion including a coil case accommodating a primary coil and a secondary coil, which are coaxial with each other and have a coil axis; and a plug mount porti
What is claimed is: 1. An ignition coil configured to be equipped with a first sparkplug of an engine, the ignition coil comprising: a coil portion including a coil case accommodating a primary coil and a secondary coil, which are coaxial with each other and have a coil axis; and a plug mount portion including a tower portion, which is formed from resin, and a plug cap, which is formed of rubber, wherein the tower portion includes a coupled portion connected with an end of the coil portion, the tower portion further includes a tower cylinder portion projected from the coupled portion and equipped with the plug cap, the plug cap is configured to be press-fitted with the first sparkplug, the coil case has an outer periphery from which a flange portion projects radially outward in a flange-projecting direction, the tower cylinder portion has a tower axis, which is substantially in parallel with the coil axis, the tower axis is offset from the coil axis in a tower-offset direction, the tower-offset direction is substantially the same as the flange-projecting direction, wherein the flange portion is configured to be fixed to a cylinder head cover, which is attached to a cylinder head of the engine, by using a fixing member, when the plug mount portion is located in a first plughole of a cylinder head of the engine and equipped with the first sparkplug, the coil portion is located completely outside of the first plughole, the coil case has one axial end side, an intermediate portion, and an other axial end side in this order in a longitudinal direction of the coil case, and the flange portion projects from the intermediate portion. 2. The ignition coil according to claim 1, wherein the plug mount portion further includes a metal fitting and a coil spring, the metal fitting is electrically connected with the secondary coil, and the coil spring is configured to electrically conduct the metal fitting with the first sparkplug. 3. The ignition coil according to claim 2, wherein the plug cap has a press-fit opening configured to be press-fitted with an insulator portion of the first sparkplug, and the press-fit opening has a plug axis that substantially coincides with the tower axis. 4. The ignition coil according to claim 2, wherein the plug cap is inclined with respect to the tower cylinder portion, the plug cap has a press-fit opening configured to be press-fitted with an insulator portion of the first sparkplug, and the press-fit opening has a plug axis that is inclined with respect to the coil axis in a substantially opposite direction to the flange-projecting direction. 5. The ignition coil according to claim 2, wherein the tower portion is a component separate from the coil case of the coil portion, the coupled portion has a fitted portion projected from the coupled portion, and the coupled portion is connected with the coil case by fitting the fitted portion to the coil case. 6. The ignition coil according to claim 2, wherein the secondary coil is wound around an outer circumferential periphery of an secondary spool, which is formed from resin to be substantially in a ring shape in cross section, the metal fitting includes a spool side metal fitting provided to the outer circumferential periphery of the secondary spool on the one axial end side, the spool side metal fitting being electrically connected with the secondary coil, the metal fitting further includes a tower side metal fitting provided to the coupled portion, the tower side metal fitting electrically connecting the spool side metal fitting with the coil spring, the spool side metal fitting is offset from the coil axis in a fitting-offset direction, which is substantially the same as a plug-offset direction in which the plug axis is offset from the coil axis, the tower side metal fitting includes a spring contact portion being in contact with the coil spring, the tower side metal fitting further includes a connecting terminal portion provided to an outer circumferential periphery of the secondary spool on the one axial end side, and the connecting terminal portion electrically connects the spool side metal fitting with the spring contact portion. 7. The ignition coil according to claim 3, wherein the plug cap includes a cap body having an outer circumferential periphery being substantially in an annular shape in cross section, the plug cap further includes a plurality of latch projections being located radially outside of the cap body at circumferential locations, the plurality of latch projections being configured to be latched in the first plughole, wherein the plug axis is offset from the coil axis such that the outer circumferential periphery of the cap body is located at: a position inside an outer circumferential periphery of the coil case; or a position substantially the same as a position of an outer circumferential periphery of the coil case. 8. The ignition coil according to claim 2 configured to be provided in a multiple ignition system, in which mixture gas is to be ignited at a plurality of locations in a cylinder of the engine, wherein the secondary coil includes a first secondary coil and a second secondary coil, the first secondary coil is located on an outer periphery of a secondary spool on the one axial end side, the secondary spool being formed from resin to be in a ring-shaped in cross section, the first secondary coil is constructed by winding a secondary electric wire, which is applied with an electrically insulative coating, from the one axial end side toward the other axial end side in a first winding direction, the second secondary coil is located on an outer periphery of the secondary spool on the other axial end side, the second secondary coil is constructed by winding a secondary electric wire, which extends from one end of the first secondary coil, the secondary electric wire is wound from the one axial end side toward the other axial end side in a second winding direction being opposite to the first winding direction, the first secondary coil is configured to be electrically connected with the first sparkplug attached to the first plughole, the second secondary coil is electrically connected with a second sparkplug attached to a second plughole of the cylinder of the engine, and the intermediate portion is located between the first secondary coil and the second secondary coil. 9. The ignition coil according to claim 2, wherein the coil case accommodates a closed magnetic path core substantially in an annulus shape and configured to conduct magnetic flux, which is generated when the primary coil is energized, through a path radially inside and outside of both the primary and secondary coils and both axial end sides of the primary and secondary coils, the closed magnetic path core includes: a core center portion located radially inside of both the primary and secondary coils; a core outer portion located radially outside of both the primary and secondary coils; a first core interconnecting portion connecting one axial ends of the core outer portion and the core center portion; and a second core interconnecting portion connecting other axial ends of the core outer portion and the core center portion, wherein the flange-projecting direction is different from a core-arrangement direction in which the core outer portion is located with respect to the core center portion. 10. The ignition coil according to claim 2, wherein the fixing member is a bolt having a fixing axis, the coil axis and the fixing axis therebetween define a first imaginary line when being viewed perpendicularly to the coil axis, the coil axis and the tower axis therebetween define a second imaginary line when being viewed perpendicularly to the coil axis, and the second imaginary line is at an angle with respect to the first imaginary line, the angle being in a range between +45 degrees and −45 degrees. 11. The ignition coil according to claim 10, wherein the second imaginary line substantially coincides with the first imaginary line. 12. The ignition coil according to claim 1, further comprising: a connector portion provided to the other axial end of the coil case, wherein the flange portion is distant from the connector portion in the longitudinal direction. 13. The ignition coil according to claim 12, wherein the connector portion and the coil case overlap one another in a radial direction of the coil case. 14. The ignition coil according to claim 13, wherein the intermediate portion is located in a substantially center portion of the coil case in the longitudinal direction. 15. The ignition coil according to claim 14, wherein the coil case is at least partially out of the cylinder head cover when the plug mount portion is located in the first plughole and equipped with the first sparkplug. 16. An ignition coil configured to be provided to a multiple ignition system, in which mixture gas is to be ignited at a plurality of locations in a cylinder of the engine, the ignition coil configured to be equipped with a first sparkplug attached to a first plughole of a cylinder head of the engine and a second sparkplug attached to a second plughole of the cylinder head, the ignition coil comprising: a coil portion including a coil case accommodating a primary coil and a secondary coil, which are coaxial with each other and have a coil axis; and a plug mount portion including a tower portion, which is formed from resin, and a plug cap, which is formed of rubber, wherein the tower portion includes a coupled portion connected with an end of the coil portion, the tower portion further includes a tower cylinder portion projected from the coupled portion and equipped with the plug cap, the plug cap is configured to be press-fitted with the first sparkplug, the coil case has an outer periphery from which a flange portion projects radially outward in a flange-projecting direction, the tower cylinder portion has a tower axis, which is substantially in parallel with the coil axis, the tower axis is offset from the coil axis in a tower-offset direction, the tower-offset direction is substantially the same as the flange-projecting direction, the flange portion is configured to be fixed to a cylinder head cover, which is attached to the cylinder head of the engine, by using a fixing member, when the plug mount portion is located in the first plughole and equipped with the first sparkplug, the coil portion is located completely outside of the first plughole, the coil case has one axial end side, an intermediate portion, and an other axial end side in the order recited in a longitudinal direction of the coil case, the secondary coil includes a first secondary coil and a second secondary coil, the first secondary coil is located on an outer periphery of a secondary spool, which is formed from resin to be in a ring-shaped in cross section, on the one axial end side and constructed by winding a secondary electric wire from the one axial end side toward the other axial end side in a first winding direction, the second secondary coil is located on an outer periphery of the secondary spool on the other axial end side and constructed by winding a secondary electric wire, which extends from one end of the first secondary coil, from the one axial end side toward the other axial end side in a second winding direction being opposite to the first winding direction, the first secondary coil is configured to be electrically connected with the first sparkplug, the second secondary coil is configured to be electrically connected with the second sparkplug attached to the second plughole, and the flange portion projects from the intermediate portion located between the first secondary coil and the second secondary coil. 17. The ignition coil according to claim 16, further comprising: a connector portion provided to the other axial end of the coil case, wherein the flange portion is distant from the connector portion in the longitudinal direction. 18. The ignition coil according to claim 17, wherein the connector portion and the coil case overlap one another in a radial direction of the coil case. 19. The ignition coil according to claim 18, wherein the intermediate portion is located in a substantially center portion of the coil case in the longitudinal direction. 20. The ignition coil according to claim 19, wherein the coil case is at least partially out of the cylinder head cover when the plug mount portion is located in the first plughole and equipped with the first sparkplug.
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