WO2024100909A1 - 点火コイル - Google Patents

点火コイル Download PDF

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Publication number
WO2024100909A1
WO2024100909A1 PCT/JP2023/002813 JP2023002813W WO2024100909A1 WO 2024100909 A1 WO2024100909 A1 WO 2024100909A1 JP 2023002813 W JP2023002813 W JP 2023002813W WO 2024100909 A1 WO2024100909 A1 WO 2024100909A1
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WO
WIPO (PCT)
Prior art keywords
resistor
cap
ignition coil
contact
peripheral surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/002813
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English (en)
French (fr)
Japanese (ja)
Inventor
篤史 篠原
旬一 丹田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Diamond and Zebra Electric Mfg Co Ltd
Original Assignee
Diamond and Zebra Electric Mfg Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Diamond and Zebra Electric Mfg Co Ltd filed Critical Diamond and Zebra Electric Mfg Co Ltd
Priority to CN202380072789.9A priority Critical patent/CN120153449A/zh
Priority to JP2024557011A priority patent/JP7723217B2/ja
Priority to EP23888268.2A priority patent/EP4604148A1/en
Publication of WO2024100909A1 publication Critical patent/WO2024100909A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/12—Ignition, e.g. for IC engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P3/00—Other installations
    • F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils

Definitions

  • This specification discloses an ignition coil for an internal combustion engine.
  • a typical ignition coil comprises a primary coil and a secondary coil for generating high voltage, a resistor for reducing electrical noise, and a high-voltage terminal that electrically connects the secondary coil and the resistor.
  • the high voltage from the secondary coil is applied to the resistor via the high-voltage terminal, and is then applied via the resistor to a spark plug installed in the combustion chamber of the high-voltage internal combustion engine. This voltage application causes a spark to be discharged from the spark plug, igniting the fuel in the internal combustion engine.
  • the resistor is usually rod-shaped.
  • a high-voltage terminal with a cap-shaped connection portion with the resistor may be used.
  • An example of an ignition coil with such a high-voltage terminal is disclosed in JP 2019-96788 A.
  • the inventor's intention is to provide an ignition coil that allows easy connection between the high voltage terminal and the resistor.
  • the ignition coil of one embodiment includes a primary coil, a secondary coil, a rod-shaped resistor, and a high-voltage terminal that electrically connects the output of the secondary coil to the resistor.
  • the high-voltage terminal includes a cap that has an inner circumferential surface and an inner bottom surface and covers the end of the resistor.
  • the ignition coil further includes at least one air passage that connects the inner bottom surface with the outside.
  • This ignition coil has an air passage that connects the inside bottom surface of the cap to the outside. When the cap is placed on the resistor, any air remaining between the tip of the resistor and the cap is released to the outside through this air passage. With this ignition coil, the cap can be inserted into the resistor without applying a large amount of force. With this ignition coil, the high-voltage terminal and resistor can be easily connected.
  • FIG. 1 is a cross-sectional view showing an ignition coil according to an embodiment.
  • FIG. 2(a) is a perspective view showing a cap and a resistor of a high voltage terminal of the ignition coil of FIG. 1, and
  • FIG. 2(b) is an exploded view of FIG. 2(a).
  • FIG. 3 is a perspective view showing the cap of FIG. 4A is a cross-sectional view taken along the line IVa-IVa in FIG. 3
  • FIG. 4B is a cross-sectional view showing a state in which a resistor is inserted into the cap in FIG. 4A.
  • FIG. 5 is a cross-sectional view taken along line VV in FIG.
  • FIG. 6(a) and 6(b) are cross-sectional views showing a cap and a resistor of an ignition coil according to another embodiment.
  • FIG. 7 is a cross-sectional view showing a cap and a resistor of an ignition coil according to still another embodiment.
  • FIG. 8(a) is a perspective view showing a cap of an ignition coil according to still another embodiment, and FIG. 8(b) is a bottom view of the cap of FIG. 8(a).
  • FIG. 9 is a bottom view showing a cap of an ignition coil according to still another embodiment.
  • FIG. 10 is a cross-sectional view showing a cap and a resistor of an ignition coil according to still another embodiment.
  • FIG. 11 is a bottom view of the cap of FIG.
  • FIG. 1 is a cross-sectional view showing an ignition coil 2 according to one embodiment.
  • arrow X represents the front of the ignition coil 2.
  • Arrow Z represents the upward direction of the ignition coil 2.
  • This ignition coil 2 is for use in an internal combustion engine.
  • this ignition coil 2 comprises a coil assembly 4, a connector section 6, and an output section 8.
  • a filler 9 made of a thermosetting resin fills the internal gaps.
  • FIG. 1 also shows a plug boot 10 and a spring 12 attached to this ignition coil 2.
  • the coil assembly 4 comprises a case 14, a primary coil 16, a secondary coil 18, an iron core 20 and a high voltage terminal 22.
  • the primary coil 16, the secondary coil 18, the iron core 20 and the high voltage terminal 22 are stored in the case 14.
  • the primary coil 16 is formed by winding wire around the iron core 20, and the secondary coil 18 is formed by winding wire around the outside of the primary coil 16.
  • the number of turns of wire in the secondary coil 18 is significantly greater than the number of turns of wire in the primary coil 16. As a result, by changing the current in the primary coil 16, a high voltage is generated in the secondary coil 18.
  • the high-voltage terminal 22 is electrically connected to the output terminal of the secondary coil 18, and is also electrically connected to a resistor 28 of the output section 8, which will be described later.
  • the output of the secondary coil 18 is applied to the resistor 28 via the high-voltage terminal 22.
  • the high-voltage terminal 22 comprises an arm 24 and a cap 26. One end of the arm 24 is connected to the output terminal of the secondary coil 18, and the other end is connected to the cap 26.
  • the high-voltage terminal 22 is made of a metal with excellent electrical conductivity. Preferred materials for the high-voltage terminal 22 include an aluminum alloy and copper.
  • the connector portion 6 is located in front of the coil assembly 4.
  • the connector portion 6 includes a cylindrical portion 30, an external terminal 32, an igniter 34, and a case 36.
  • the case 36 of the connector portion 6 is formed integrally with the case 14 of the coil assembly 4.
  • the cylindrical portion 30 has a cylindrical shape that is open at the front.
  • a plurality of external terminals 32 are located inside the cylindrical portion 30. Some of the external terminals 32 are connected to an igniter 34.
  • the igniter 34 is located at the rear of the cylindrical portion 30.
  • the igniter 34 is a switch that controls the conduction and interruption of current in the primary coil 16 by a signal from outside.
  • the case 36 covers the igniter 34.
  • the output section 8 is located below the coil assembly 4.
  • the output section 8 has a cylindrical shape extending downward from the coil assembly 4.
  • the output section 8 has a rod-shaped resistor 28 inside.
  • the plug boot 10 and spring 12 are attached to the output section 8.
  • the high voltage generated in the secondary coil 18 is input to the resistor 28 via the high-voltage terminal 22, and sent from the resistor 28 to the spring 12.
  • the spring 12 connects to the spark plug.
  • FIG. 2(a) is an enlarged perspective view of the resistor 28 and the cap 26 of the high voltage terminal 22, and FIG. 2(b) is an exploded view of FIG. 2(a).
  • the resistor 28 is rod-shaped. In this embodiment, the resistor 28 is cylindrical.
  • the resistor 28 has an upper portion 28a, a central portion 28b, and a lower portion 28c. The outer diameters of the upper portion 28a and the lower portion 28c are slightly larger than the outer diameter of the central portion 28b.
  • the lower portion 28c of the resistor 28 contacts the spring 12.
  • the tip of the spring 12 is connected to the spark plug.
  • the upper portion 28a of the resistor 28 is covered with the cap 26.
  • the resistor 28 has an appropriate electrical resistance value and inductance value to suppress electrical noise (conductive noise and radiative noise) caused by discharge at the spark plug.
  • the size of the outer diameter of resistor 28 may be constant from the upper end to the lower end.
  • the shape of resistor 28 does not have to be cylindrical.
  • resistor 28 may be a rectangular prism.
  • the cap 26 is cylindrical.
  • a recess 42 is provided on the upper surface of the cap 26.
  • the tip portion of the arm 24 has a downwardly convex bent portion, and this bent portion fits into the recess 42 of the cap 26. This connects the cap 26 and the arm 24.
  • FIG. 3 is a perspective view of the cap 26 seen from diagonally below.
  • the cap 26 has a cavity 44 inside.
  • An opening 48 of the cavity 44 is provided in the bottom surface 46 of the cap 26.
  • This cavity 44 forms an inner peripheral surface 50 and an inner bottom surface 52 in the cap 26.
  • the inner peripheral surface 50 extends in the vertical direction (the direction in which the resistor 28 extends).
  • the corner between the bottom surface 46 and the inner peripheral surface 50 of the cap 26 has a rounded shape.
  • the upper portion 28a of the resistor 28 is fitted into this cavity 44.
  • the upper surface 29 of the resistor 28 is in contact with the inner bottom surface 52 of the cap 26.
  • the cap 26 covers one end of the resistor 28. In this embodiment, the cap 26 covers the upper portion 28a of the resistor 28. This electrically connects the high-voltage terminal 22 and the resistor 28.
  • FIG. 4(a) is a cross-sectional view taken along line IVa-IVa in FIG. 3. This is a cross-section perpendicular to the direction in which resistor 28 extends when resistor 28 is not inserted into cavity 44.
  • the two-dot chain line represents inscribed circle Ic of inner circumferential surface 50.
  • inner circumferential surface 50 is substantially polygonal in shape.
  • inner circumferential surface 50 is approximately hexagonal in shape.
  • inner circumferential surface 50 is composed of six sides.
  • inner circumferential surface 50 of cap 26 and inscribed circle Ic are in contact at three points.
  • Figure 4(b) is a cross section perpendicular to the direction in which resistor 28 extends when resistor 28 is inserted into cavity 44 and covered by cap 26. This figure shows the state in which resistor 28 is inserted in Figure 4(a).
  • outer peripheral surface 53 of resistor 28 is formed slightly larger than inscribed circle Ic shown in Figure 4(a). Therefore, inner peripheral surface 50 of cap 26 in Figure 4(b) is slightly deformed compared to inner peripheral surface 50 in Figure 4(a).
  • inner peripheral surface 50 of cap 26 and outer peripheral surface 53 of resistor 28 are substantially in contact at multiple points 54.
  • inner peripheral surface 50 of cap 26 and outer peripheral surface 53 of resistor 28 are in contact at three points 54. This contact fixes cap 26 to resistor 28. In other words, the point 54 where the cap 26 and the resistor 28 contact each other is located at a position where the cap 26 can be fixed to the resistor 28.
  • the inner circumferential surface 50 has an edge that contacts the outer circumferential surface 53 of the resistor 28 and an edge that does not contact the outer circumferential surface 53 of the resistor 28.
  • the edge that contacts the outer circumferential surface 53 of the resistor 28 is called a contact edge 56.
  • the edge that does not contact the outer circumferential surface 53 of the resistor 28 is called a non-contact edge 58.
  • the number of contact edges 56 and non-contact edges 58 is three each.
  • the contact edge 56 is sandwiched between two non-contact edges 58.
  • the contact edges 56 and non-contact edges 58 are arranged alternately.
  • the "point contact" between the inner circumferential surface 50 of the cap 26 and the outer circumferential surface 53 of the resistor 28 means that the length of this contact portion measured in the circumferential direction of the resistor 28 at the position where the inner circumferential surface 50 of the cap 26 and the outer circumferential surface 53 of the resistor 28 are in contact is 5% or less of the outer circumferential length of the resistor 28.
  • the three contacting sides 56 are substantially the same length.
  • the three contacting sides 56 may be of different lengths.
  • the three non-contacting sides 58 are substantially the same length.
  • the three non-contacting sides 58 may be of different lengths.
  • the contact edge 56 does not have to be sandwiched between two non-contact edges 58.
  • Multiple contact edges 56 may be continuous. There may be no non-contact edges 58. Multiple non-contact edges 58 may exist between two contact edges 56.
  • the number of points 54 at which the inner circumferential surface 50 of the cap 26 and the outer circumferential surface 53 of the resistor 28 contact each other does not have to be three.
  • the number of points 54 at which the inner circumferential surface 50 of the cap 26 and the outer circumferential surface 53 of the resistor 28 contact each other may be three or more and six or less.
  • FIG. 5 is a cross-sectional view taken along line V-V in FIG. 4(b).
  • a gap 55 exists between the inner circumferential surface 50 and the outer circumferential surface 53 at positions other than the positions where the inner circumferential surface 50 and the outer circumferential surface 53 are in contact at points.
  • This gap 55 extends from the inner bottom surface 52 to the outside.
  • This gap 55 is an air passage 55 connecting the inner bottom surface 52 and the outside.
  • the inner circumferential surface 50 and the outer circumferential surface 53 are in contact at three points 54, and therefore three air passages 55 are formed between these points 54.
  • a gap 55 is provided between the inner peripheral surface 50 of the cap 26 and the outer peripheral surface 53 of the resistor 28.
  • This gap 55 is an air passage 55 that connects the inner bottom surface 52 of the cap 26 to the outside.
  • the cap 26 can be inserted into the resistor 28 without applying a large force.
  • the high voltage terminal 22 and the resistor 28 can be easily connected. Damage to the upper portion 28a of the resistor 28 is prevented when the cap 26 is placed on the resistor 28.
  • the size and shape of the outside diameter of resistors can vary from product to product.
  • the outside diameter shape can deviate from a perfect circle. This variation can make it difficult to attach the cap to the resistor. In some cases, the cap cannot be placed on the resistor up to the specified position, or the top of the resistor can be damaged.
  • an ignition coil that allows easy and reliable connection between the high-voltage terminal and the resistor.
  • the outer peripheral surface 53 of the resistor 28 and the inner peripheral surface 50 of the cap 26 of the high-voltage terminal 22 are in contact at three points 54. Because the outer peripheral surface 53 of the resistor 28 and the inner peripheral surface 50 of the cap 26 of the high-voltage terminal 22 are in point contact, the contact area between the resistor 28 and the cap 26 is small. Also, because the outer peripheral surface 53 of the resistor 28 and the inner peripheral surface 50 of the cap 26 of the high-voltage terminal 22 are in point contact, even if the outer diameter and shape of the resistor 28 vary, the area of the portion of the inner peripheral surface 50 that must be deformed is small.
  • the inner peripheral surface 50 of the cap 26 can be flexibly deformed. Even if the outer diameter and shape of the resistor 28 vary, in this ignition coil 2, the high-voltage terminal 22 and the resistor 28 can be easily connected. Furthermore, because the inner circumferential surface 50 of the cap 26 contacts the resistor 28 at three points 54, the cap 26 can be stably fixed to the resistor 28. In this ignition coil 2, the high-voltage terminal 22 and the resistor 28 can be reliably connected.
  • the inner circumferential surface 50 has a contact edge 56 and a non-contact edge 58. Compared to when the inner circumferential surface 50 has only the contact edge 56, it is possible to make the inner circumferential surface 50 closer to a circular shape. This makes it possible to reduce the positional variation in thickness between the inner circumferential surface 50 of the cap 26 and the outer circumferential surface of the cap 26. This contributes to achieving excellent strength for the cap 26.
  • the contact edge 56 is sandwiched between the non-contact edges 58. There are non-contact edges 58 on both sides of the contact edge 56. In this way, when the resistor 28 comes into contact with the contact edges 56, the inner circumferential surface 50 of the cap 26 can flexibly deform. In this ignition coil 2, the high voltage terminal 22 and the resistor 28 can be easily connected.
  • the corners of the contact side 56 and the non-contact side 58 have a rounded shape.
  • the symbol C in Figure 4(a) represents the intersection position of the contact side 56 and the non-contact side 58 when the contact side 56 and the non-contact side 58 are extended assuming that they are not rounded.
  • the angle between the contact side 56 and the non-contact side 58 becomes the intersection position.
  • the length of the contact side 56 and the non-contact side 58 is defined as the distance between the two intersection positions C located at both ends of the side.
  • the double-headed arrow L1 represents the length of the contact side 56.
  • the double-headed arrow L2 represents the length of the non-contact side 58 adjacent to the contact side 56.
  • the length L1 of the contact edge 56 is longer than the length L2 of the non-contact edge 58 adjacent to this contact edge 56.
  • the inner surface 50 of the cap 26 can flexibly deform when the resistor 28 contacts the contact edge 56.
  • the high voltage terminal 22 and the resistor 28 can be easily connected. From this perspective, it is more preferable that the length of each contact edge 56 is longer than the lengths of all the other non-contact edges 58.
  • Length L1 is preferably 1.5 times or more than length L2. By making length L1 1.5 times or more than length L2, the inner surface 50 of cap 26 can flexibly deform when resistor 28 contacts contact edge 56. In this ignition coil 2, high voltage terminal 22 and resistor 28 can be easily connected.
  • Length L1 is preferably 2.5 times or less than length L2. By making length L1 2.5 times or less than length L2, it is possible to make inner surface 50 into a shape close to a circle. This makes it possible to reduce the positional variation in thickness between inner surface 50 and outer surface 53 of cap 26. This contributes to realizing excellent strength of cap 26.
  • FIG. 6(a) is a cross-sectional view showing the cap 60 and resistor 62 of the high-voltage terminal of an ignition coil according to another embodiment. This is a cross-section perpendicular to the direction in which the resistor 62 extends, at a position where the resistor 62 is covered by the cap 60.
  • This ignition coil is the same as the ignition coil 2 in FIG. 1, except for the cap 60.
  • the inner peripheral surface 64 of the cap 60 has a substantially octagonal shape.
  • the inner peripheral surface 64 is composed of eight sides.
  • the inner peripheral surface 64 of the cap 60 and the outer peripheral surface 66 of the resistor 62 are in contact with each other at multiple points 68.
  • the inner peripheral surface 64 of the cap 60 and the outer peripheral surface 66 of the resistor 62 are in contact with each other at four points 68.
  • This contact fixes the cap 60 to the resistor 62.
  • the number of contact edges 70 and the number of non-contact edges 72 are four.
  • the contact edge 70 is sandwiched between two non-contact edges 72.
  • the contact edges 70 and the non-contact edges 72 are arranged alternately.
  • a gap 67 exists between the inner peripheral surface 64 and the outer peripheral surface 66. This gap 67 is an air passage 67 that connects the inner bottom surface of the cap 60 to the outside.
  • a gap 67 is provided between the inner circumferential surface 64 of the cap 60 and the outer circumferential surface 66 of the resistor 62.
  • the outer peripheral surface 66 of the resistor 62 and the inner peripheral surface 64 of the cap 60 of the high-voltage terminal are in contact at four points 68. Since the outer peripheral surface 66 of the resistor 62 and the inner peripheral surface 64 of the cap 60 of the high-voltage terminal are in point contact, the contact area between the resistor 62 and the cap 60 is small. Also, since the outer peripheral surface 66 of the resistor 62 and the inner peripheral surface 64 of the cap 60 of the high-voltage terminal are in point contact, the inner peripheral surface 64 of the cap 60 can be flexibly deformed.
  • the high-voltage terminal and the resistor 62 can be easily connected. Also, since the inner peripheral surface 64 of the cap 60 is in contact with the resistor 62 at four points 68, the cap 60 can be stably fixed to the resistor 62. In this ignition coil, the high-voltage terminal and the resistor 62 can be reliably connected.
  • FIG. 6(b) is a cross-sectional view showing the cap 80 of the high voltage terminal and the resistor 82 of an ignition coil according to yet another embodiment. This is a cross-section perpendicular to the direction in which the resistor 82 extends, at the position where the resistor 82 is covered by the cap 80.
  • This ignition coil is the same as the ignition coil 2 of FIG. 1, except for the cap 80.
  • the inner peripheral surface 84 of the cap 80 has a substantially dodecagonal shape.
  • the inner peripheral surface 84 is composed of twelve sides.
  • the inner peripheral surface 84 of the cap 80 and the outer peripheral surface 86 of the resistor 82 are in contact at six points 88. This contact fixes the cap 80 to the resistor 82.
  • the number of contact edges 90 and the number of non-contact edges 92 are six.
  • the contact edge 90 is sandwiched between two non-contact edges 92.
  • the contact edges 90 and the non-contact edges 92 are arranged alternately.
  • a gap 87 exists between the inner peripheral surface 84 and the outer peripheral surface 86. This gap 87 is an air passage 87 that connects the inner bottom surface of the cap 80 to the outside.
  • the inner circumferential surface has a generally decagonal shape.
  • the inner circumferential surface is composed of ten sides.
  • the inner circumferential surface of the cap and the outer circumferential surface of the resistor are in contact at five points. This contact secures the cap to the resistor.
  • the number of contacting edges and non-contacting edges is five each.
  • the contacting edge is sandwiched between two non-contacting edges.
  • the contacting edges and non-contacting edges are arranged alternately.
  • FIG. 7 is a cross-sectional view showing the cap 100 of the high voltage terminal and the resistor 102 of an ignition coil according to yet another embodiment. This is a cross-section perpendicular to the direction in which the resistor 102 extends, at a position where the resistor 102 is covered by the cap 100.
  • This ignition coil is the same as the ignition coil 2 of FIG. 1, except for the cap 100.
  • the inner circumferential surface 104 of the cap 100 and the outer circumferential surface 106 of the resistor 102 are in contact at three points 108.
  • the number of contact edges 110 and the number of non-contact edges 112 are three.
  • the contact edge 110 is sandwiched between two non-contact edges 112.
  • the contact edges 110 and the non-contact edges 112 are arranged alternately.
  • a gap 107 exists between the inner circumferential surface 104 and the outer circumferential surface 106.
  • the non-contact edges 112 are curved.
  • the non-contact edges 112 are in the shape of an arc.
  • the outer peripheral surface 106 of the resistor 102 and the inner peripheral surface 104 of the cap 100 of the high-voltage terminal are in contact at three points 108. Furthermore, in this embodiment, since the non-contact edge 112 is arc-shaped, the thickness between the outer peripheral surface 106 and the inner peripheral surface 104 of the cap 100 at this portion can be reduced. As a result, the inner peripheral surface 104 of the cap 100 can be flexibly deformed. Even if the outer diameter and shape of the resistor 102 vary, the high-voltage terminal and the resistor 102 can be easily connected in this ignition coil.
  • the cap 100 since the inner peripheral surface 104 of the cap 100 contacts the resistor 102 at three points 108, the cap 100 can be stably fixed to the resistor 102. In this ignition coil, the high-voltage terminal and the resistor 102 can be reliably connected.
  • the shape of the ignition coil cap is not limited to the shape of the above embodiment.
  • the contact edge may be curved. It is sufficient that the outer circumferential surface of the resistor and the inner circumferential surface of the high voltage terminal cap are in contact at three to six points.
  • the number of points at which the outer peripheral surface of the resistor and the inner peripheral surface of the cap of the high-voltage terminal come into contact is preferably 5 or less, more preferably 4 or less, and most preferably 3.
  • Fig. 8(a) is a perspective view of the cap 120 of the high-voltage terminal of an ignition coil according to yet another embodiment, viewed from diagonally below.
  • Fig. 8(b) is a bottom view of the cap 120 of Fig. 8(a). This ignition coil is the same as the ignition coil 2 shown in Fig. 1, except for the cap 120.
  • the cap 120 has a cavity 122 inside.
  • This cavity 122 forms an inner circumferential surface 124 and an inner bottom surface 126 in the cap 120.
  • the inner circumferential surface 124 extends in the vertical direction (the direction in which the resistor extends).
  • a groove 128 is provided in the inner circumferential surface 124 of the cap 120.
  • the inner circumferential surface 124 is substantially circular except for the groove 128.
  • the upper part of the resistor is fitted into this cavity 122.
  • the inner circumferential surface 124 comes into contact with the outer circumferential surface of the resistor.
  • the cap 120 covers one end of the resistor. This electrically connects the high-voltage terminal and the resistor.
  • each groove 128 extends from the end on the inner bottom surface 126 side to the end on the bottom surface 130 side.
  • the groove 128 is an air passage 128 that connects the inner bottom surface 126 to the outside.
  • a groove 128 is provided that connects the inner bottom surface 126 of the cap 120 to the outside.
  • any air remaining between the top surface of the resistor and the inner bottom surface 126 of the cap 120 is released to the outside through this groove 128.
  • the cap 120 can be inserted into the resistor without applying a large force.
  • the high voltage terminal and the resistor can be easily connected. Damage to the top of the resistor is prevented when the cap 120 is placed on the resistor.
  • the double-headed arrow W indicates the width of the groove 128.
  • the width W is preferably 0.5 mm or more, more preferably 1.0 mm or more, and even more preferably 2.0 mm or more. From the viewpoint of ease of processing, the width W is preferably 5 mm or less.
  • the double-headed arrow D indicates the depth of the groove 128.
  • the depth D is preferably 0.5 mm or more, more preferably 1.0 mm or more, and even more preferably 1.2 mm or more. From the viewpoint of ease of processing, the depth D is preferably 3 mm or less.
  • the three grooves 128 are preferably spaced at equal intervals. This allows the air between the inner bottom surface 126 and the top surface of the resistor to be uniformly discharged from each groove 128 when the cap 120 is placed over the resistor. With this ignition coil, the high voltage terminal and the resistor can be easily connected.
  • FIG. 9 is a bottom view showing the cap 140 of the high voltage terminal of an ignition coil according to yet another embodiment.
  • a groove 144 is provided on the inner peripheral surface 142 of the cap 140.
  • two grooves 144 are provided.
  • This ignition coil is the same as the ignition coil shown in FIG. 8, except for the number of grooves 144.
  • the two grooves 144 are provided at opposing positions. In this way, when the cap 140 is placed over the resistor, the air between the inner bottom surface 146 and the top surface of the resistor can be uniformly discharged from each groove 144. With this ignition coil, the high voltage terminal and the resistor can be easily connected.
  • the number of grooves 144 may be four or more, or may be one. From the viewpoint of effectively discharging air remaining between the top surface of the resistor and the inner bottom surface 146 of the cap 140, the number of grooves 144 is preferably two or more. From the viewpoint of ease of processing, the number of grooves 144 is preferably six or less, more preferably five or less, and even more preferably four or less.
  • FIG. 10 is a cross-sectional view of a cap 150 and resistor 152 of a high-voltage terminal of an ignition coil according to yet another embodiment.
  • FIG. 10 shows a cross-section cut along a plane parallel to the direction in which the high-voltage terminal extends.
  • FIG. 11 is a bottom view showing the cap 150 of FIG. 10. This ignition coil is the same as the ignition coil 2 shown in FIG. 1, except for the cap 150.
  • the cap 150 has a hole 158 that extends from the inner bottom surface 154 to the top surface 156. As shown in FIG. 10, in this embodiment, one opening of the hole 158 is located at the bottom of the recess 160 in the top surface 156. As shown in FIG. 11, the other opening of the hole 158 is provided in the center of the inner bottom surface 154.
  • the inner peripheral surface 155 of the cap 150 is substantially circular. The inner peripheral surface 155 contacts the outer peripheral surface of the resistor. When the cap 150 is placed on the resistor 152, air between the inner bottom surface 154 and the top surface 162 of the resistor 152 is exhausted to the outside through the hole 158.
  • the hole 158 is an air passage 158 that connects the inner bottom surface 154 to the outside.
  • a hole 158 is provided that connects the inner bottom surface 154 of the cap 150 to the outside.
  • any air remaining between the upper surface 162 of the resistor 152 and the inner bottom surface 154 of the cap 150 is released to the outside through this hole 158.
  • the cap 150 can be inserted into the resistor 152 without applying a large force.
  • the high voltage terminal and the resistor 152 can be easily connected. Damage to the upper part of the resistor 152 is prevented when the cap 150 is placed over the resistor 152.
  • the opening of the hole 158 is preferably provided in the center of the inner bottom surface 154. In this way, when the cap 150 is placed over the resistor 152, the air between the inner bottom surface 154 and the upper surface 162 of the resistor 152 can be discharged evenly through the hole 158. With this ignition coil, the high voltage terminal and the resistor 152 can be easily connected.
  • the double-headed arrow E indicates the inner diameter of the hole 158.
  • the inner diameter E is preferably 0.5 mm or more. By making the inner diameter E 0.5 mm or more, air remaining between the upper surface 162 of the resistor 152 and the inner bottom surface 154 of the cap 150 is effectively released to the outside through this hole 158. From this perspective, it is more preferable that the inner diameter E be 1.0 mm or more.
  • the bent portion of the arm fits into a recess 160 in the top surface 156 of the cap 150.
  • the bent portion comes into contact with the surface of the recess 160, ensuring a good contact area between the arm and the cap 150.
  • the inner diameter E of the hole 158 exceeds 2.0 mm, the corner of the bent portion will easily fit into the opening of the hole 158, and this contact area may become smaller. From the standpoint of ensuring a good contact area between the arm and the cap 150, it is preferable that the inner diameter E be 2.0 mm or less.
  • an ignition coil in which the outer peripheral surface of the resistor and the inner peripheral surface of the cap are in contact at a point, an ignition coil in which the inner peripheral surface of the cap has a groove, and an ignition coil in which the cap has a hole extending from the inner bottom surface to the top surface have been described.
  • An ignition coil may have more than one of these features.
  • the outer peripheral surface of the resistor and the inner peripheral surface of the cap may be in contact at a point, and the cap may have a hole extending from the inner bottom surface to the top surface.
  • the inner peripheral surface of the cap may have a groove, and the cap may have a hole extending from the inner bottom surface to the top surface.
  • this embodiment provides an ignition coil that allows easy connection between the high voltage terminal and the resistor. This clearly shows the advantages of this embodiment.
  • the high voltage terminal includes a cap having an inner periphery and an inner bottom surface and covering an end of the resistor;
  • An ignition coil for an internal combustion engine further comprising at least one air passage connecting the inner bottom surface and an outside.
  • Item 13 The ignition coil according to item 11 or 12, wherein the inner diameter of the hole is 0.5 mm or more and 2.0 mm or less.
  • the ignition coil described above is used in various internal combustion engines.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
PCT/JP2023/002813 2022-11-11 2023-01-30 点火コイル Ceased WO2024100909A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN202380072789.9A CN120153449A (zh) 2022-11-11 2023-01-30 点火线圈
JP2024557011A JP7723217B2 (ja) 2022-11-11 2023-01-30 点火コイル
EP23888268.2A EP4604148A1 (en) 2022-11-11 2023-01-30 Ignition coil

Applications Claiming Priority (2)

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JP2022-180792 2022-11-11
JP2022180792 2022-11-11

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WO2024100909A1 true WO2024100909A1 (ja) 2024-05-16

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019096788A (ja) 2017-11-24 2019-06-20 株式会社デンソー 内燃機関用の点火コイル
JP2019102607A (ja) * 2017-11-30 2019-06-24 株式会社デンソー 内燃機関用点火コイル

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019096788A (ja) 2017-11-24 2019-06-20 株式会社デンソー 内燃機関用の点火コイル
JP2019102607A (ja) * 2017-11-30 2019-06-24 株式会社デンソー 内燃機関用点火コイル

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CN120153449A (zh) 2025-06-13
JPWO2024100909A1 (https=) 2024-05-16
JP7723217B2 (ja) 2025-08-13
EP4604148A1 (en) 2025-08-20

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