Ignition coil

Abstract

To provide an ignition coil capable of preventing poor contact between terminals in the inside of the ignition coil.SOLUTION: An ignition coil 2 includes: a first terminal including a bobbin 40 having a first bottom surface 44, a second bottom surface 46 and a side surface 48 and a wire 42 wound around the side surface 48 of the bobbin 40; and a second terminal contacting the wire 42 in a plurality of parts of the wire 42. Preferably, the bobbin 40 includes a slit 52; the second terminal includes an insert part 54; the insert part 54 is inserted into the slit 52 from a first opening 52a provided in the first bottom surface 44 of the bobbin 40; the wire 42 passes above the second and third openings 52b and 52c of the slit 52 provided in the side surface 48; one end surface of the insert part 54 in the width direction contacts a part of the wire 42 passing above the second opening 52b; and the other end surface of the insert part 54 contacts a part of the wire 42 passing above the third opening 52c.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] This specification discloses an ignition coil for an internal combustion engine.

Background Art

[0002] The ignition coil of an internal combustion engine includes a connector portion which is an interface with the outside, and a coil assembly which houses a coil that generates high voltage. The connector portion includes a plurality of external terminals that are electrically connected to an external control device, and a plurality of connector terminals that are electrically connected to the input terminals of the coil assembly. A signal from the outside is transmitted to the coil assembly via the connector portion.

[0003] In a conventional ignition coil, the input terminals of the coil assembly are rod-shaped, and the connector terminals are plate-shaped with slits. By fitting the input terminals into the slits, the input terminals and the connector terminals are electrically connected. Japanese Unexamined Patent Application Publication No. 2012-174828 and Japanese Utility Model Publication No. 4-5622 disclose the connection structure between the input terminals and the connector terminals of an ignition coil.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] When an ignition coil is mounted in, for example, an automobile, the ambient temperature varies greatly. The input terminals and the connector terminals are deformed by repeating expansion and contraction due to temperature changes, and poor contact between the input terminals and the connector terminals may occur.

[0006] The inventor's intention is to provide an ignition coil in which poor contact between terminals inside the ignition coil is prevented. [Means for solving the problem]

[0007] An ignition coil according to one embodiment includes a first terminal comprising a bobbin having a first bottom surface, a second bottom surface and a side surface, and a wire wound around the side surface of the bobbin, and a second terminal that contacts the wire at multiple portions of the wire. [Effects of the Invention]

[0008] In this ignition coil, the first terminal has a structure in which a wire is wound around the side of the bobbin. The second terminal is in contact with multiple parts of this wire. This effectively prevents poor contact between the first and second terminals. This ignition coil also prevents poor contact between terminals inside the ignition coil. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a cross-sectional view showing an ignition coil according to one embodiment. [Figure 2] Figure 2 is a perspective view showing the connector portion of the ignition coil from Figure 1, along with the input terminals and primary coil of the coil assembly. [Figure 3] Figure 3 is a perspective view showing an enlarged view of the connector terminals and input terminals from Figure 2. [Figure 4] Figure 4(A) is a side view of the connector terminals and input terminals of Figure 3, and Figure 4(B) is a cross-sectional view along the line IVb-IVb in Figure 4(A). [Figure 5] Figure 5 is a perspective view of the connector terminals shown in Figure 3. [Figure 6] Figure 6(A) is a side view of the input terminal in Figure 3 before it is connected to the connector terminal, and Figure 6(B) is a bottom view of the input terminal in Figure 6(A). [Figure 7]Figure 7(A) is a side view of the connector terminal and input terminal according to another embodiment, and Figure 7(B) is a cross-sectional view along the line VIIb-VIIb in Figure 7(A). [Figure 8] Figure 8(A) is a side view of the input terminal shown in Figure 7(A) before it is connected to the connector terminal, and Figure 8(B) is a bottom view of the input terminal shown in Figure 8(A). [Figure 9] Figure 9(A) is a side view of a connector terminal and an input terminal according to yet another embodiment, and Figure 9(B) is a perspective view of the connector terminal of Figure 9(A). [Figure 10] Figure 10 is a perspective view of connector terminals and input terminals according to yet another embodiment. [Figure 11] Figure 11 is a perspective view of connector terminals and input terminals according to yet another embodiment. [Figure 12] Figure 12(A) is a side view of a connector terminal and an input terminal according to yet another embodiment, and Figure 12(B) is a perspective view of the connector terminal of Figure 12(A). [Figure 13] Figure 13 is a perspective view of connector terminals and input terminals according to yet another embodiment. [Figure 14] Figure 14 is a perspective view of connector terminals and input terminals according to yet another embodiment. [Modes for carrying out the invention]

[0010] Preferred embodiments will be described in detail below, with reference to drawings as appropriate.

[0011] [First Embodiment] Figure 1 is a cross-sectional view showing an ignition coil 2 according to one embodiment. In Figure 1, arrow X represents the front of the ignition coil 2. The opposite direction is the rear. Arrow Z represents the top of the ignition coil 2. The opposite direction is the bottom. This ignition coil 2 is for an internal combustion engine. As shown in Figure 1, the ignition coil 2 comprises a coil assembly 4, a connector section 6, and an output section 8. Figure 1 also shows a plug boot 10 and a spring 12 attached to the ignition coil 2.

[0012] The coil assembly 4 includes a case 14, a primary coil 16, a secondary coil 18, and an iron core 20. Although not visible in FIG. 1, the coil assembly 4 further includes input terminals. The primary coil 16, the secondary coil 18, and the iron core 20 are stored in the case 14. The primary coil 16 is formed by winding a wire around the iron core 20, and the secondary coil 18 is formed by winding a wire around the outside of the primary coil 16. The number of turns of the wire of the secondary coil 18 is significantly larger than the number of turns of the wire of the primary coil 16. Thus, by changing the current in the primary coil 16, a high voltage is generated in the secondary coil 18. The wire of the primary coil 16 and the wire of the secondary coil 18 are typically copper wires.

[0013] FIG. 2 is a perspective view showing the input terminals 22 of the coil assembly 4 and the primary coil 16 together with the connector portion 6. There are a plurality of input terminals 22. Each input terminal 22 extends from the primary coil 16 side toward the connector portion 6 side.

[0014] As shown in FIG. 1, the output portion 8 is located below the coil assembly 4. The output portion 8 has a cylindrical shape extending downward from the coil assembly 4. As shown in FIG. 1, a plug boot 10 and a spring 12 are attached to the output portion 8. The output portion 8 includes a rod-shaped resistor 28 inside. The high voltage generated in the secondary coil 18 is input to the resistor 28 and sent from the resistor 28 to the spring 12. When the plug boot 10 is attached to the internal combustion engine, the spring 12 connects to the spark plug.

[0015] As shown in FIG. 1, the connector portion 6 is located in front of the coil assembly 4. As shown in FIGS. 1 and 2, the connector portion 6 includes a cylindrical portion 30, an external terminal 32, an igniter 34, a case 36, and a connector terminal 38. The case 36 of the connector portion 6 is formed integrally with the case 14 of the coil assembly 4. In FIG. 2, the case 36 is omitted.

[0016] The cylindrical portion 30 has a cylindrical shape with an open front. Multiple external terminals 32 are located inside the cylindrical portion 30. Some of the external terminals 32 are directly connected to corresponding connector terminals. 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 output of the igniter 34 is connected to a corresponding connector terminal. The igniter 34 is a switch that controls the conduction and interruption of current in the primary coil 16 based on an external signal. The case 36 covers the igniter 34. As shown in Figure 2, multiple connector terminals 38 protrude from the rear of the igniter 34.

[0017] Figure 3 shows an enlarged view of the input terminal 22 and connector terminal 38 of the coil assembly 4 in Figure 2. Figure 3 is a view of the input terminal 22 and connector terminal 38 from the connector part 6 side. Figure 4(A) is a side view of the input terminal 22 and connector terminal 38 in Figure 3. Figure 4(B) is a cross-sectional view along the line IVb-IVb in Figure 4(A). Figure 4(B) shows the bottom surface of the input terminal 22 and a cross-section of the connector terminal 38.

[0018] The input terminal 22 comprises a bobbin 40 and a wire 42. The bobbin 40 has a first bottom surface 44, a second bottom surface 46, and a side surface 48. The bobbin 40 is columnar in shape. In this embodiment, the shapes of the first bottom surface 44 and the second bottom surface 46 are oval. The shapes of these bottom surfaces 44 and 46 are not limited to ovals. The shapes of the bottom surfaces 44 and 46 may be circles, ellipses, or polygons. The bottom surfaces 44 and 46 may have other shapes. In this embodiment, a recess 50 extending in the circumferential direction is provided on the side surface 48 of the bobbin 40. The wire 42 is wound around this recess 50. The recess 50 is not required on the side surface 48 of the bobbin 40.

[0019] As shown in Figures 3 and 4, the bobbin 40 is provided with a slit 52. The slit 52 extends from a first bottom surface 44 toward a second bottom surface 46. As shown in Figure 4(B), the first bottom surface 44 of the bobbin 40 has a first opening 52a of the slit 52 that crosses the first bottom surface 44. As shown in Figure 4(A), the side surface 48 of the bobbin 40 has a second opening 52b of the slit 52 that extends from one end of the first opening 52a. Although not visible in Figure 4(A), the side surface 48 of the bobbin 40 has a third opening 52c of the slit 52 that extends from the other end of the first opening 52a. The second opening 52b and the third opening 52c each extend through a recess 50. The second opening 52b and the third opening 52c have a step at the position where they intersect with the recess 50. In this embodiment, the bobbin 40 is made of a resin composition. Examples of preferred materials for the bobbin 40 include PBT (polybutylene terephthalate), PPS (polyphenylene sulfide), and PET (polyethylene terephthalate).

[0020] The wire 42 is wound around the side 48 of the bobbin 40. As mentioned above, the wire 42 is wound around the recess 50 on the side 48 of the bobbin 40. The wire 42 passes over the second opening 52b and the third opening 52c. In this embodiment, the wire 42 is wound multiple times around the side 48 of the bobbin 40. The number of turns of the wire 42 may be one. The wire 42 does not need to go around the side 48 of the bobbin 40 in one go, as long as it passes over the second opening 52b and the third opening 52c at least once. At this input terminal 22, the wire 42 is connected to the wire of the primary coil 16. The tip of the wire of the primary coil 16 is pulled out and connected to the input terminal 22. The wire 42 of this input terminal 22 is continuous with the wire of the primary coil 16. A typical material for the wire 42 is copper.

[0021] Figure 5 is a perspective view showing the connector terminal 38. The connector terminal 38 comprises an insertion portion 54 and an arm 56. The insertion portion 54 is plate-shaped. In this embodiment, the tip of the insertion portion 54 is tapered. The tip of the insertion portion 54 may have a rounded shape. The insertion portion 54 extends from the tip of the arm 56. The arm 56 is connected to the output terminal or external terminal 32 of the igniter 34.

[0022] The insertion portion 54 is inserted into the slit 52 through the first opening 52a. The tip of the insertion portion 54 is in contact with the bottom of the slit 52. A groove may be formed in the bottom of the slit 52 into which the tip of the insertion portion 54 is press-fitted. If a groove is formed in the bottom of the slit 52, the tip of the insertion portion 54 can be press-fitted into the groove, thereby positioning and fixing the insertion portion 54. As shown in Figure 4(A), in this embodiment, the thickness of the insertion portion 54 is smaller than the width of the slit 52. A gap exists between the side wall of the slit 52 and the insertion portion 54. As shown in Figure 4(B), in this embodiment, the width of the insertion portion 54 is longer than the length of the first opening 52a. At the position where the wire 42 is wound, the width of the insertion portion 54 is longer than the distance between the second opening 52b and the third opening 52c. The insertion portion 54 is exposed to the outside through the second opening 52b and the third opening 52c. The insertion portion 54 protrudes outward from the second opening 52b and the third opening 52c. Both end faces in the width direction of the insertion portion 54 protrude from the corresponding openings. The wire 42 is in contact with the end faces of the protruding insertion portion 54. In the position where the insertion portion 54 protrudes, the wire 42 is not aligned with the side surface 48 of the bobbin 40. In the position where the insertion portion 54 protrudes, the wire 42 is curved outward.

[0023] If the end face of the insertion portion 54 is exposed to the outside at the second opening 52b and the third opening 52c, it does not have to protrude from the second opening 52b and the third opening 52c. For example, the insertion portion 54 may protrude from only one of the second opening 52b and the third opening 52c. The insertion portion 54 does not have to protrude from either the second opening 52b or the third opening 52c. In this case, at the position where the wire 42 is wound, the width of the insertion portion 54 is the same as the distance between the second opening 52b and the third opening 52c. It is only necessary that both end faces of the insertion portion 54 are in contact with the wire 42.

[0024] The manufacturing method of this ignition coil 2 includes the following steps. (1) Step of preparing the bobbin 40 (2) Step of winding the wire 42 around the bobbin 40 (3) Step of assembling the coil assembly 4 (portion excluding the case 14) (4) Step of assembling the connector portion 6 (portion excluding the case 36) (5) Step of connecting the connector terminal 38 and the input terminal 22 of the coil assembly 4 (6) Step of covering the cases 14 and 36

[0025] In the step (1), the bobbin 40 having the slit 52 shown in FIGS. 4(A) and (B) is prepared.

[0026] In step (2) above, the wire 42 is wound around the side surface 48 of the bobbin 40. In this embodiment, the leading edge of the wire of the primary coil 16 is wound around the side surface 48 of the bobbin 40. This forms the input terminal 22 of the coil assembly 4. Figure 6(A) is a side view showing the formed input terminal 22, and Figure 6(B) is a bottom view of the input terminal 22. As shown in Figure 6(A), the wire 42 is wound around the recess 50 of the side surface 48 of the bobbin 40. The wire 42 passes over the second opening 52b and the third opening 52c of the slit 52. As shown in Figure 6(B), the wire 42 is wound along the side surface 48 of the bobbin 40 at the location where the recess 50 is provided. The wire 42 passes over the second opening 52b and the third opening 52c while running along the side surface 48 of the bobbin 40.

[0027] In step (3) above, the components of the coil assembly 4, such as the primary coil 16 and the secondary coil 18, are placed on the output section 8, and the coil assembly 4 (excluding the case 14) is assembled. In step (4) above, the connector section 6 (excluding the case 36) shown in Figure 2 is assembled using the connector terminals 38.

[0028] In step (5) above, the insertion portion 54 of the connector terminal 38 is inserted into the slit 52 from the first opening 52a of the bobbin 40. The width of this insertion portion 54 is greater than the distance between the second opening 52b and the third opening 52c at the position where the wire 42 is wound. The insertion portion 54 protrudes from the second opening 52b and the third opening 52c. The insertion portion 54 is inserted into the slit 52 while pushing the wire 42 outward at the positions of the second opening 52b and the third opening 52c. The wire 42 is curved outward, resulting in the state shown in Figure 4(B). The connector terminal 38 is firmly fixed to the input terminal 22.

[0029] In step (6) above, the case 14 of the coil assembly 4 and the case 36 of the connector part 6 are placed over it. The ignition coil 2 shown in Figure 1 is formed.

[0030] The effects and advantages of this embodiment will be explained below.

[0031] In this embodiment, the input terminal 22 has a structure in which a wire 42 is wound around the side surface 48 of the bobbin 40. The connector terminal 38 is in contact with multiple portions of this wire 42. This effectively prevents poor contact between the input terminal 22 and the connector terminal 38. In this ignition coil 2, poor contact between terminals inside the ignition coil 2 is prevented.

[0032] In this embodiment, the wire 42 is wound around the side surface 48 of the bobbin 40 so as to pass outside the second opening 52b and the third opening 52c of the slit 52. The insertion portion 54 of the connector terminal 38 is exposed through the second opening 52b and the third opening 52c and is in contact with the wire 42. Both ends of this insertion portion 54 in the width direction are in contact with the wire 42. This effectively prevents poor contact between the input terminal 22 and the connector terminal 38.

[0033] The insertion portion 54 is preferably protruding outward from the second opening 52b or from the second opening 52b. This increases the contact pressure between the wire 42 and the insertion portion 54. In this ignition coil 2, poor contact between the input terminal 22 and the connector terminal 38 is effectively prevented. From this viewpoint, it is more preferable that the insertion portion 54 protrudes outward from both the second opening 52b and the third opening 52c.

[0034] From the viewpoint of effectively preventing poor contact between the input terminal 22 and the connector terminal 38, the number of turns of the wire 42 is preferably 2 or more, and more preferably 3 or more.

[0035] In this embodiment, the width of the slit 52 is greater than the thickness of the insertion portion 54. A gap is provided between the side wall of the slit 52 and the insertion portion 54. This allows the insertion portion 54 to be easily inserted into the slit 52. This ignition coil 2 is easy to assemble.

[0036] In the manufacturing method of the ignition coil 2 according to this embodiment, the input terminal 22 is formed by winding a wire 42 around a bobbin 40. At this stage, the wire 42 passes over the second opening 52b and the third opening 52c while running along the side surface 48 of the bobbin 40. An insertion portion 54, wider than the distance between the second opening 52b and the third opening 52c, is inserted into the slit 52 of the input terminal 22. The insertion portion 54 is inserted into the slit 52 while pushing the wire 42 outward. A reaction force from the wire 42 is applied to the insertion portion 54. In Figure 4(B), the direction of this reaction force is indicated by arrow F1. As a result, the contact pressure between the insertion portion 54 and the wire 42 increases. In this ignition coil 2, poor contact between the input terminal 22 and the connector terminal 38 is effectively prevented. Furthermore, the reaction force from the wire 42 firmly fixes the connector terminal 38 to the input terminal 22.

[0037] [Second Embodiment] Figure 7(A) is a side view showing the input terminal 60 and connector terminal 62 of the coil assembly of an ignition coil according to another embodiment. Figure 7(B) is a cross-sectional view along the line VIIb-VIIb in Figure 7(A). In Figure 7(B), the bottom surface of the input terminal 60 and the cross-section of the connector terminal 62 are shown. This ignition coil is the same as ignition coil 2 in Figure 1, except for the input terminal 60.

[0038] The input terminal 60 comprises a bobbin 64 and a wire 66. The bobbin 64 has a first bottom surface 68, a second bottom surface 70, and a side surface 72. The bobbin 64 is provided with a slit 74. The first bottom surface 68 of the bobbin 64 has a first opening 74a of the slit 74 that crosses the first bottom surface 68. The side surface 72 of the bobbin 64 has a second opening 74b of the slit 74 extending from one end of the first opening 74a, and a third opening 74c of the slit 74 extending from the other end of the first opening 74a. The wire 66 is wound around the side surface 72 of the bobbin 64. The wire 66 passes over the second opening 74b and the third opening 74c. The end of the wire of the primary coil is pulled out and connected to the input terminal 60.

[0039] The insertion portion 76 of the connector terminal 62 is inserted into the slit 74 through the first opening 74a. As shown in Figure 7(A), in this embodiment, the width of the slit 74 is the same as the thickness of the insertion portion 76. The side wall of the slit 74 is in contact with the insertion portion 76. As shown in Figure 7(B), in this embodiment, at the position where the wire 66 is wound, the width of the insertion portion 76 is longer than the distance between the second opening 74b and the third opening 74c. The insertion portion 76 protrudes outward from the second opening 74b and the third opening 74c. The wire 66 is in contact with the end face of the protruding insertion portion 76. At the position where the insertion portion 76 protrudes, the wire 66 is not aligned with the side surface 72 of the bobbin 64. At the position where the insertion portion 76 protrudes, the wire 66 is curved outward.

[0040] The manufacturing method for this ignition coil includes the following steps: (1) Steps to prepare the bobbin 64 (2) The process of winding wire 66 onto bobbin 64 (3) Process of assembling the coil assembly (excluding the case) (4) The process of assembling the connector part (excluding the case) (5) Step of connecting the connector terminal 62 and the input terminal 60 of the coil assembly. (6) The process of covering with a case

[0041] In step (1) above, a bobbin 64 having a slit 74, as shown in Figures 7(A) and (B), is prepared.

[0042] In step (2) above, the wire 66 is wound around the side surface 72 of the bobbin 64. This forms the input terminal 60. Figure 8(A) is a side view showing the formed input terminal 60, and Figure 8(B) is a bottom view of the input terminal 60. As shown in Figure 8(A), the wire 66 passes over the second opening 74b and the third opening 74c of the slit 74. As shown in Figure 8(B), at this stage, the wire 66 is wound along the side surface 72 of the bobbin 64. The wire 66 passes over the second opening 74b and the third opening 74c while running along the side surface 72 of the bobbin 64.

[0043] In step (3) above, the components of the coil assembly, such as the primary coil and secondary coil, are placed on the output section, and the coil assembly (excluding the case) is assembled. In step (4) above, the connector section (excluding the case) is assembled using the connector terminals 62.

[0044] In step (5) above, the insertion portion 76 of the connector terminal 62 is inserted into the slit 74 through the first opening 74a of the bobbin 64. Figure 8(A) shows the connector terminal 62 together with the input terminal 60 before insertion. As shown in Figure 8(A), in this embodiment, the width of the slit 74 of the bobbin 64 is smaller than the thickness of the insertion portion 76 of the connector terminal 62. The insertion portion 76 is inserted into the slit 74 in the direction of the arrow. The insertion portion 76 is inserted into the slit 74 while pushing the slit 74 open. Once the insertion portion 76 is inserted, as shown in Figure 7(A), the width of the slit 74 becomes the same as the thickness of the insertion portion 76.

[0045] The width of the insertion portion 76 is greater than the distance between the second opening 74b and the third opening 74c at the position where the wire 66 is wound. The insertion portion 76 protrudes from the second opening 74b and the third opening 74c. The insertion portion 76 is inserted into the slit 74 at the positions of the second opening 74b and the third opening 74c, pushing the wire 66 outward. The wire 66 is curved outward, resulting in the state shown in Figure 7(B). The connector terminal 62 is firmly fixed to the input terminal 60.

[0046] In step (6) above, the case for the coil assembly and the case for the connector are placed over it. The ignition coil shown in Figure 1 is formed.

[0047] In the ignition coil manufacturing method according to this embodiment, the width of the slit 74 is smaller than the thickness of the insertion portion 76. The insertion portion 76 is inserted while expanding the slit 74. A reaction force from the side wall of the slit 74 is applied to the insertion portion 76. In Figure 7(A), the direction of this reaction force is indicated by arrow F2. As a result, the insertion portion 76 is firmly fixed to the input terminal 60.

[0048] In this embodiment, when the wire 66 is wound onto the bobbin 64, the wire 66 passes over the second opening 74b and the third opening 74c while running along the side surface 72 of the bobbin 64. An insertion portion 76, with a width greater than the distance between the second opening 74b and the third opening 74c, is inserted into the slit 74 of the input terminal 60. The insertion portion 76 is inserted into the slit 74 while pushing the wire 66 outward. A reaction force from the wire 66 is applied to the insertion portion 76. In Figure 7(B), the direction of this reaction force is indicated by arrow F'1. Due to the reaction force from the wire 66, the contact pressure between the insertion portion 76 and the wire 66 increases. Furthermore, as described above, the insertion portion 76 is inserted into the slit 74 while pushing it open. The bobbin 64 deforms so that its width increases, and a force is applied to the wire 66 from the bobbin 64. In Figure 7(B), the direction of the force applied from the bobbin 64 to the wire 66 is indicated by arrow F3. This increases the tension in the wire 66, and the force from the wire 66 to the insertion part 76, indicated by direction F'1, becomes even greater. The contact pressure between the insertion part 76 and the wire 66 increases further. In this ignition coil, poor contact between terminals inside the ignition coil is effectively prevented.

[0049] At the stage when the wire 66 is wound onto the bobbin 64, the width of the slit 74 may be the same as the thickness of the insertion portion 76. In this ignition coil, insertion of the insertion portion 76 into the slit 74 is easy. In this ignition coil, the bobbin 64 firmly secures the insertion portion 76.

[0050] [Third Embodiment] Figure 9(A) is a side view showing the input terminal 80 and connector terminal 82 of the coil assembly of an ignition coil according to yet another embodiment. Figure 9(B) is a perspective view showing the connector terminal 82 of Figure 9(A). This ignition coil is the same as the ignition coil 2 of Figure 1, except for the input terminal 80 and connector terminal 82.

[0051] The input terminal 80 comprises a bobbin 84 and a wire 86. In this embodiment, the bobbin 84 has a first bottom surface 88, a second bottom surface 90, and a side surface 92. The bobbin 84 is provided with a slit 94. The first bottom surface 88 of the bobbin 84 has a first opening 94a of the slit 94 that crosses the first bottom surface 88. The side surface 92 of the bobbin 84 has a second opening 94b of the slit 94 extending from one end of the first opening 94a, and a third opening 94c of the slit 94 extending from the other end of the first opening 94a. The wire 86 is wound around the side surface 92 of the bobbin 84. The wire 86 passes over the second opening 94b and the third opening 94c. The end of the wire of the primary coil is pulled out and connected to the input terminal 80.

[0052] As shown in Figure 9(B), the connector terminal 82 comprises an insertion portion 96 and an arm 98. The insertion portion 96 has a shape in which a flat plate is folded back, and this folding creates a main portion 100 and a folded portion 102 on the insertion portion 96. The main portion 100 and the folded portion 102 overlap. The main portion 100 extends from the tip of the arm 98. The arm 98 is connected to the output terminal or external terminal of the igniter.

[0053] As shown in Figure 9(A), the insertion portion 96 is inserted into the slit 94 through the first opening 94a. In this embodiment, the thickness of the insertion portion 96 (the sum of the thickness of the main portion 100 and the thickness of the folded portion 102) is the same as the width of the slit 94. The side walls of the slit 94 are in contact with the insertion portion 96. The thickness of the insertion portion 96 may be less than the width of the slit 94. In this embodiment, at the position where the wire 86 is wound, the width of the insertion portion 96 is longer than the distance between the second opening 94b and the third opening 94c. The main portion 100 and the folded portion 102 protrude outward from the second opening 94b and the third opening 94c. One end face of the main portion 100 and one end face of the folded portion 102 are in contact with the portion of the wire 86 passing over the second opening 94b. The other end face of the main portion 100 and the other end face of the folded portion 102 are in contact with the portion of the wire 86 passing over the third opening 94c. When the insertion portion 96 is protruding, the wire 86 is not aligned with the side surface 92 of the bobbin 84.

[0054] At the position where the wire 86 is wound, the main portion 100 and the folded portion 102 do not need to protrude from the second opening 94b and the third opening 94c, as long as they are exposed to the outside at the second opening 94b and the third opening 94c. It is sufficient that both end faces of the main portion 100 and the folded portion 102 can contact the wire 86.

[0055] In this embodiment, the insertion portion 96 has a shape in which a flat plate is folded back, and the insertion portion 96 has a main portion 100 and a folded portion 102 formed thereon. Both end faces of the main portion 100 and the folded portion 102 are in contact with the wire 86. In this ignition coil, the contact area between the insertion portion 96 and the wire 86 is large. In this ignition coil, poor contact between the input terminal 80 and the connector terminal 82 is effectively prevented.

[0056] In this embodiment, the insertion portion 96 has the shape of a flat plate folded in half. The insertion portion 96 may also have the shape of a flat plate folded in thirds. The number of folds of the insertion portion 96 may be four or more.

[0057] [Fourth Embodiment] Figure 10 is a perspective view showing the input terminal 110 and connector terminal 112 of the coil assembly of an ignition coil according to yet another embodiment. This ignition coil is the same as ignition coil 2 in Figure 1, except for the connector terminal 112.

[0058] As shown in Figure 10, the connector terminal 112 comprises an insertion portion 114, a pair of side portions 118, and an arm 120. The insertion portion 114 is plate-shaped. The insertion portion 114 extends from the tip of the arm 120. The pair of side portions 118 are each located on the outside in the width direction of the insertion portion 114. Each side portion 118 comprises a base portion 116 extending outward in the width direction from the insertion portion 114, and a main body portion 117 extending parallel to the insertion portion 114 from the base portion 116. A gap is provided between the insertion portion 114 and the main body portion 117. The width of the gap between the insertion portion 114 and the main body portion 117 is the same as the diameter of the wire 126, or slightly smaller than the diameter of the wire 126. The arm 120 is connected to the output terminal or external terminal of the igniter.

[0059] As shown in Figure 10, the insertion portion 114 is inserted into the slit 124 of the bobbin 122. At this time, the wire 126 is sandwiched between the insertion portion 114 exposed from the second opening 124b and one side portion 118. The wire 126 is also sandwiched between the insertion portion 114 exposed from the third opening and the other side portion 118. The insertion portion 114 and each of the side portions 118 are in contact with the wire 126.

[0060] The connector terminal 112 may have only one side portion 118. That is, the side portion 118 may be provided only on one outer side in the width direction of the insertion portion 114. In this case, the wire 126 is sandwiched between either the insertion portion 114 exposed from the second opening 124b or the insertion portion 114 exposed from the third opening and the side portion 118.

[0061] In this embodiment, the connector terminal 112 includes a side portion 118 located on the outside in the width direction of the insertion portion 114. The wire 126 is sandwiched between the insertion portion 114 and the side portion 118. The wire 126 is in contact with the insertion portion 114 and the side portion 118. In this ignition coil, the contact area between the input terminal 110 and the connector terminal 112 is large. Furthermore, since the wire 126 is sandwiched between the insertion portion 114 and the side portion 118, the contact pressure between the wire 126 and the insertion portion 114 and the side portion 118 is high. In this ignition coil, poor contact between the input terminal 110 and the connector terminal 112 is effectively prevented.

[0062] [Fifth Embodiment] Figure 11 is a perspective view showing the input terminal 130 and connector terminal 132 of the coil assembly of an ignition coil according to yet another embodiment. This ignition coil is the same as ignition coil 2 in Figure 1, except for the input terminal 130 and connector terminal 132.

[0063] The input terminal 130 comprises a bobbin 134 and a wire 137. In this embodiment, the bobbin 134 has a first bottom surface, a second bottom surface 136, and a side surface 138. This bobbin 134 does not have a slit. The wire 137 is wound around the side surface 138 of the bobbin 134. The end of the wire of the primary coil is pulled out and connected to the input terminal 130.

[0064] As shown in Figure 11, the connector terminal 132 comprises a pair of gripping plates 140 and an arm 144. The gripping plates 140 are plate-shaped. Each gripping plate 140 is located on the outside in the width direction of the arm 144. Each gripping plate 140 comprises a base portion 142 extending outward in the width direction from the arm 144 and a main body portion 143 extending from the base portion 142 along the side surface 138 of the bobbin 134. The main body portion 143 faces the side surface 138 of the bobbin 134. The pair of gripping plates 140 clamp the bobbin 134 from the outside of the wire 137. The pair of gripping plates 140 clamp the bobbin 134 and the wire 137. The surface of each gripping plate 140 is in contact with the wire 137.

[0065] In this embodiment, the connector terminal 132 is equipped with a pair of gripping plates 140. The gripping plates 140 clamp the bobbin 134 from the outside of the wire 137. Each gripping plate 140 is in contact with the wire 137. In this ignition coil, the contact area between the input terminal 130 and the connector terminal 132 is large. Furthermore, since the wire 137 and the bobbin 134 are sandwiched between the pair of gripping plates 140, the contact pressure between the wire 137 and the gripping plates 140 is high. In this ignition coil, poor contact between the input terminal 130 and the connector terminal 132 is effectively prevented.

[0066] [Sixth Embodiment] Figure 12(A) is a perspective view showing the input terminal 150 and connector terminal 152 of the coil assembly of an ignition coil according to yet another embodiment. Figure 12(B) is a perspective view showing the connector terminal 152 of Figure 12(A). This ignition coil is the same as ignition coil 2 in Figure 1, except for the input terminal 150 and connector terminal 152.

[0067] The input terminal 150 comprises a bobbin 154 and a wire 156. In this embodiment, the bobbin 154 has a first bottom surface, a second bottom surface 158, and a side surface 160. The bobbin 154 has a slit 162. The first bottom surface of the bobbin 154 is provided with a first opening 162a of the slit 162 that crosses the first bottom surface. The side surface 160 of the bobbin 154 is provided with a second opening 162b of the slit 162 extending from one end of the first opening 162a, and a third opening of the slit 162 extending from the other end of the first opening 162a. The wire 156 is wound on the side surface 160 of the bobbin 154. The wire 156 passes over the second opening 162b and the third opening. The end of the wire of the primary coil is pulled out and connected to the input terminal 150.

[0068] As shown in Figure 12(B), the connector terminal 152 comprises an insertion portion 164, a pair of gripping plates 166, and an arm 170. The insertion portion 164 is plate-shaped. The insertion portion 164 extends from the tip of the arm 170. The gripping plates 166 are plate-shaped. Each gripping plate 166 is located on the outside in the width direction of the arm 170. The gripping plate 166 comprises a base portion 168 extending outward in the width direction from the arm 170, and a main body portion 169 extending from the base portion 168 along the side surface 160 of the bobbin 154. The main body portion 169 faces the side surface 160 of the bobbin 154.

[0069] As shown in Figure 12(A), the insertion portion 164 is inserted into the slit 162 through the first opening 162a. In this embodiment, the thickness of the insertion portion 164 is less than the width of the slit 162. A gap exists between the insertion portion 164 and the side wall of the slit 162. In this embodiment, at the position where the wire 156 is wound, the width of the insertion portion 164 is longer than the distance between the second opening 162b and the third opening. The insertion portion 164 protrudes outward from the second opening 162b and the third opening. One end face of the insertion portion 164 is in contact with the portion of the wire 156 passing over the second opening 162b. The other end face of the insertion portion 164 is in contact with the portion of the wire 156 passing over the third opening. At the position where the insertion portion 164 protrudes, the wire 156 is not aligned with the side surface 160 of the bobbin 154. At the position where the insertion portion 164 protrudes, the wire 156 is curved outward.

[0070] The insertion portion 164 does not need to protrude from the second opening 162b and the third opening, as long as it is exposed to the outside at the second opening 162b and the third opening. It is sufficient that both end faces of the insertion portion 164 can contact the wire 156 at the corresponding opening positions.

[0071] As shown in Figure 12(A), the gripping plate 166 faces the side surface 160 of the bobbin 154 in a position where the second opening 162b and the third opening are absent. The pair of gripping plates 166 clamp the bobbin 154 from the outside of the wire 156. The pair of gripping plates 166 clamp the bobbin 154 and the wire 156. The surface of each gripping plate 166 is in contact with the wire 156.

[0072] In this embodiment, the wire 156 is wound around the side surface 160 of the bobbin 154 so as to pass outside the second and third openings 162b and third openings. The insertion portion 164 of the connector terminal 152 is exposed from the second and third openings 162b and third openings of the side surface 160 and is in contact with the wire 156. Both ends of the insertion portion 164 in the width direction are in contact with the wire 156. Furthermore, in this embodiment, a pair of gripping plates 166 clamp the bobbin 154 from the outside of the wire 156. Each gripping plate 166 is in contact with the wire 156. In this ignition coil, the insertion portion 164 and the pair of gripping plates 166 are in contact with the wire 156. In this ignition coil, the contact area between the input terminal 150 and the connector terminal 152 is large. In this ignition coil, poor contact between the input terminal 150 and the connector terminal 152 is effectively prevented.

[0073] In this embodiment, since the insertion portion 164 protrudes outward from the second opening 162b or the third opening, the contact pressure between the wire 156 and the insertion portion 164 is high. Furthermore, since the wire 156 and the bobbin 154 are sandwiched between a pair of gripping plates 166, the contact pressure between the wire 156 and the gripping plates 166 is also high. In this ignition coil, poor contact between the input terminal 150 and the connector terminal 152 is effectively prevented.

[0074] [Seventh Embodiment] Although not shown, in ignition coils according to other embodiments, the ignition coil in Figure 12(A) has a shape in which the width of the slit is the same as the thickness of the insertion portion. This ignition coil is the same as the ignition coil in Figure 12(A), except that the width of the slit is the same as the thickness of the insertion portion.

[0075] In the manufacture of this ignition coil, similar to the manufacture of the ignition coil shown in Figures 8(A) and (B), the width of the slit is smaller than the thickness of the connector terminal insertion part before the wire is wound on the bobbin and the insertion part is inserted into the slit. Furthermore, in this state, the wire is wound along the side of the bobbin. The wire passes over the second and third openings while running along the side of the bobbin.

[0076] In the manufacture of this ignition coil, the insertion part is inserted into the slit. The insertion part is inserted into the slit while expanding it. Once the insertion part is inserted, the width of the slit becomes the same as the thickness of the insertion part. The insertion part is also inserted into the slit at the positions of the second and third openings while pushing the wire outwards. Once the insertion part is inserted, the wire curves outwards.

[0077] In this embodiment, the insertion part is inserted into the slit while pushing the wire outward. A reaction force from the wire is applied to the insertion part. Due to the reaction force from the wire, the contact pressure between the insertion part and the wire increases. Furthermore, the insertion part is inserted into the slit while expanding it. The bobbin deforms so that its width increases, and a force is applied to the wire from the bobbin. This increases the tension of the wire, and the force from the wire to the insertion part increases even further. The contact pressure between the insertion part and the wire increases even more. In this ignition coil, poor contact between terminals inside the ignition coil is effectively prevented.

[0078] In this embodiment, the wire and bobbin are further sandwiched between a pair of gripping plates, so the contact pressure between the wire and the gripping plates is also high in this part. In this ignition coil, poor contact between the input terminal 150 and the connector terminal 152 is prevented even more effectively.

[0079] [Eighth Embodiment] Figure 13 is a perspective view showing the input terminal 180 and connector terminal 182 of the coil assembly of an ignition coil according to yet another embodiment. This ignition coil is the same as ignition coil 2 in Figure 1, except for the input terminal 180 and connector terminal 182.

[0080] The input terminal 180 comprises a bobbin 184 and a wire 186. In this embodiment, the bobbin 184 has a first bottom surface, a second bottom surface 188 and a side surface 190. In this embodiment, the shapes of the first and second bottom surfaces 188 are circular. The bobbin 184 is cylindrical. The shapes of these bottom surfaces 188 are not limited to circles. The shape of the bottom surface may be, for example, an oval, an ellipse, or a polygon. The bobbin 184 does not have a slit.

[0081] The wire 186 is wound around the side 190 of the bobbin 184. In this embodiment, the wire 186 is wound around the side 190 of the bobbin 184 multiple times. The number of turns of the wire 186 may be one. At this input terminal 180, the wire 186 is connected to the wire of the primary coil. The tip of the wire of the primary coil is pulled out and connected to the input terminal 180.

[0082] As shown in Figure 13, the connector terminal 182 comprises a sheathing portion 192 and an arm 194. The sheathing portion 192 covers a portion of the side surface 190 of the bobbin 184 from the outside of the wire 186. The sheathing portion 192 covers the wire 186 and a portion of the side surface 190 of the bobbin 184. In this embodiment, the sheathing portion 192 covers approximately half of the side surface 190 of the bobbin 184. In this embodiment, when viewed from the bottom side of the bobbin 184, the sheathing portion 192 has an arc shape. The inner surface 190 of the sheathing portion 192 has a shape corresponding to the side surface 190 of the bobbin 184. At the position where the sheathing portion 192 covers the wire 186, the sheathing portion 192 is in contact with the wire 186. The sheathing portion 192 extends from the tip of the arm 194. The arm 194 is connected to the output terminal or external terminal of the igniter.

[0083] In this embodiment, the covering portion 192 of the connector terminal 182 covers a part of the side surface 190 of the bobbin 184 from the outside of the wire 186. At the position where the covering portion 192 covers the wire 186, the covering portion 192 is in contact with the wire 186. In this ignition coil, the contact area between the input terminal 180 and the connector terminal 182 is large. In this ignition coil, poor contact between the input terminal 180 and the connector terminal 182 is effectively prevented.

[0084] In this embodiment, the covering portion 192 covers approximately half of the side surface 190 of the bobbin 184. The covering portion 192 may cover more than half of the side surface 190 of the bobbin 184 at the location where the wire 186 is wound, or it may cover less than half of the side surface 190 of the bobbin 184. From the viewpoint of more effectively preventing poor contact between the input terminal 180 and the connector terminal 182, it is preferable that the covering portion 192 covers 1 / 4 or more of the side surface 190 of the bobbin 184 at the location where the wire 186 is wound, more preferably 1 / 3 or more, and even more preferably 1 / 2 or more.

[0085] [Ninth Embodiment] Figure 14 is a perspective view showing the input terminal 200 and connector terminal 202 of the coil assembly of an ignition coil according to yet another embodiment. This ignition coil is the same as ignition coil 2 in Figure 1, except for the input terminal 200 and connector terminal 202.

[0086] The input terminal 200 comprises a bobbin 204 and a wire 206. In this embodiment, the bobbin 204 has a first bottom surface, a second bottom surface 208 and a side surface 210. In this embodiment, the shapes of the first and second bottom surfaces 208 are circular. The bobbin 204 is cylindrical. The shapes of these bottom surfaces 208 are not limited to circles. The shape of the bottom surface may be, for example, an oval, an ellipse, or a polygon. The bobbin 204 does not have a slit.

[0087] The wire 206 is wound around the side surface 210 of the bobbin 204. In this embodiment, the wire 206 is wound around the side surface 210 of the bobbin 204 multiple times. The number of turns of the wire 206 may be one.

[0088] As shown in Figure 14, the connector terminal 202 comprises a covering portion 212 and an arm 214. The covering portion 212 covers the side surface 210 of the bobbin 204 from the outside of the wire 206. In this embodiment, the covering portion 212 has a cylindrical shape with an open bottom. The covering portion 212 has a hole. The wire 206 and the bobbin 204 are inserted into the hole in the covering portion 212. The inner circumferential surface of the covering portion 212 has a shape corresponding to the side surface 210 of the bobbin 204. In this embodiment, when viewed from the bottom side of the bobbin 204, the covering portion 212 is circular. The covering portion 212 is in contact with the wire 206. The covering portion 212 is in contact with the wire 206 at the position where the covering portion 212 covers the wire 206. The covering portion 212 extends from the tip of the arm 214. Arm 214 is connected to the output terminal or external terminal of the igniter.

[0089] In this embodiment, the covering portion 212 of the connector terminal 202 has a hole into which the wire 206 and bobbin 204 are inserted. At the position where the covering portion 212 covers the wire 206, the covering portion 212 is in contact with the wire 206. In this ignition coil, the contact area between the input terminal 200 and the connector terminal 202 is large. In this ignition coil, poor contact between the input terminal 200 and the connector terminal 202 is effectively prevented.

[0090] [Other embodiments] In the input terminal shown in Figure 13, the bobbin may have a slit extending from the first bottom surface to the second bottom surface, and the connector terminal may have an insertion portion into which it is inserted. In this ignition coil, the end of the insertion portion is in contact with the wire, and the covering portion is also in contact with the wire. In this ignition coil, the contact area between the input terminal and the connector terminal is large. In this ignition coil, poor contact between the input terminal and the connector terminal is effectively prevented.

[0091] In the input terminal shown in Figure 14, the bobbin may have a slit extending from the first bottom surface to the second bottom surface, and the connector terminal may have an insertion portion into which it is inserted. The insertion portion is inserted into the slit. In this ignition coil, the end of the insertion portion is in contact with the wire, and the covering portion is also in contact with the wire. In this ignition coil, the contact area between the input terminal and the connector terminal is large. In this ignition coil, poor contact between the input terminal and the connector terminal is effectively prevented.

[0092] The embodiments described above describe an ignition coil in which poor contact between the input terminal and connector terminal of the coil assembly is prevented. To prevent poor contact between other terminals of the ignition coil, the terminal structures shown in the above embodiments may be applied. The first terminal of the ignition coil may consist of a bobbin and a wire wound around the side of the bobbin, and the second terminal of the ignition coil may be in contact with multiple portions of this wire or cover the bobbin from the outside of the wire.

[0093] As described above, according to this embodiment, an ignition coil is obtained in which poor contact between terminals inside the ignition coil is prevented. From this, the advantages of this embodiment are clear.

[0094] [Disclosure items] The following items constitute a disclosure of preferred embodiments.

[0095] [Item 1] A first terminal comprising a bobbin having a first bottom surface, a second bottom surface and a side surface, and a wire wound around the side surface of the bobbin. and The second terminals that contact the wire at multiple portions of the aforementioned wire An ignition coil equipped with the following features.

[0096] [Item 2] The bobbin is provided with a slit extending from the first bottom surface toward the second bottom surface, The first bottom surface is provided with a first opening of the slit, and the side surface is provided with a second opening of the slit extending from one end of the first opening and a third opening of the slit extending from the other end of the first opening. The wire passes over the second opening and the third opening, The second terminal comprises an arm and a plate-shaped insertion portion extending from the arm, The insertion portion is inserted into the slit from the first opening. The ignition coil according to item 1, wherein the insertion portion is exposed from the second and third openings and in contact with the portion of the wire passing over the second opening and the portion of the wire passing over the third opening.

[0097] [Item 3] The ignition coil according to item 2, wherein the insertion portion protrudes outward from the second or third opening.

[0098] [Item 4] The second terminal further comprises a side portion located on the outside in the width direction of the insertion portion, The ignition coil according to item 2 or 3, wherein the wire is sandwiched between the insertion portion and the side portion.

[0099] [Item 5] An ignition coil according to any one of items 2 to 4, wherein the thickness of the insertion portion is smaller than the width of the slit.

[0100] [Item 6] An ignition coil according to any one of items 2 to 4, wherein the thickness of the insertion portion is the same as the width of the slit.

[0101] [Item 7] The aforementioned insertion portion has a shape in which a flat plate is folded back, and this folding creates a main portion and a folded portion in the insertion portion. The ignition coil according to any one of items 2 to 6, wherein the main portion and the folded portion are exposed from the second opening and the third opening and in contact with the portion of the wire passing over the second opening and the portion of the wire passing over the third opening.

[0102] [Item 8] The second terminal comprises an arm and a pair of gripping plates extending from the arm, An ignition coil according to any one of items 2 to 7, wherein the pair of gripping plates clamp the bobbin from the outside of the wire.

[0103] [Item 9] A first terminal comprising a bobbin having a first bottom surface, a second bottom surface and a side surface, and a wire wound around the side surface of the bobbin. and A second terminal comprising an arm and a covering portion extending from the arm, covering at least a portion of the side surface of the bobbin and in contact with the wire. An ignition coil equipped with the following features.

[0104] [Item 10] The covering portion has a cylindrical shape with holes, The ignition coil according to item 9, wherein the wire and the bobbin are inserted into the hole in the covering portion so that the covering portion and the wire are in contact.

[0105] [Item 11] The bobbin is provided with a slit extending from the first bottom surface toward the second bottom surface, The first bottom surface is provided with a first opening of the slit, and the side surface is provided with a second opening of the slit extending from one end of the first opening and a third opening of the slit extending from the other end of the first opening. The wire passes over the second opening and the third opening, The second terminal further comprises a plate-shaped insertion portion extending from the arm, The insertion portion is inserted into the slit from the first opening. The ignition coil according to item 9 or 10, wherein the insertion portion is exposed from the second and third openings and in contact with the portion of the wire passing over the second opening and the portion of the wire passing over the third opening.

[0106] [Item 12] The coil assembly includes a primary coil, a secondary coil, and an input terminal, and the connector section includes a connector terminal and an external terminal that connect to the input terminal. An ignition coil according to any one of items 1 to 11, wherein the first terminal is the input terminal and the second terminal is the connector terminal.

[0107] [Item 13] A bobbin having a first bottom surface, a second bottom surface, and a side surface, wherein the bobbin is provided with a slit extending from the first bottom surface toward the second bottom surface, a first opening of the slit is provided on the first bottom surface, and a second opening of the slit extending from one end of the first opening and a third opening of the slit extending from the other end of the first opening are provided on the side surface, a step of preparing a bobbin, The process of winding a wire around the side of the bobbin so that it passes over the second and third openings to form the first terminal. and A step of inserting a plate-shaped insertion portion of a second terminal, having a width wider than the distance between the second and third openings, into the slit from the first opening, thereby causing the insertion portion to protrude from the second and third openings and come into contact with the wire. A method for manufacturing an ignition coil, including the method described above.

[0108] [Item 14] In the process of preparing the bobbin, the width of the slit is formed to be smaller than the thickness of the insertion portion. The method for manufacturing an ignition coil according to item 13, wherein the insertion portion is inserted into the slit while expanding the slit.

[0109] [Item 15] The method for manufacturing an ignition coil according to Item 13, wherein in the step of preparing the bobbin, the width of the slit is formed to be greater than or equal to the thickness of the insertion portion. [Industrial applicability]

[0110] The ignition coils described above are used in various internal combustion engines. [Explanation of Symbols]

[0111] 2. Ignition coil 4. Coil Assembly 6. Connector section 8. Output section 10... Plug boots 12... Spring 14, 36... cases 16. Primary coil 18. Secondary coil 20... Iron core 22, 60, 80, 110, 130, 150, 180, 200... Input terminals 28...Resistor 30...Cylinder part 32...External terminals 34. Igniter 38, 62, 82, 112, 132, 152, 182, 202... Connector terminals 40, 64, 84, 122, 134, 154, 184, 204... bobbins 42, 66, 86, 126, 137, 156, 186, 206... wires 44, 68, 88,...first bottom surface 46, 70, 90, 136, 158, 188, 208...Second bottom 48, 72, 92, 138, 160, 190, 210... side view 50... indentation 52, 74, 94, 124, 162... Slits 52a, 74a, 94a, 162a... First opening of the slit 52b, 74b, 94b, 124b, 162b... Second opening of the slit 52c, 74c... Third opening of the slit 54, 76, 96, 114, 164... Insertion part 56, 98, 120, 144, 194, 214...arm 100... Main part 102...Turning point 118...side 140, 166...grip plate 192, 212... Covering

Claims

1. A first terminal comprising a bobbin having a first bottom surface, a second bottom surface and a side surface, and a wire wound around the side surface of the bobbin. and The second terminals that contact the wire at multiple portions of the aforementioned wire Equipped with, The bobbin is provided with a slit extending from the first bottom surface toward the second bottom surface, The first bottom surface is provided with a first opening of the slit, and the side surface is provided with a second opening of the slit extending from one end of the first opening and a third opening of the slit extending from the other end of the first opening. The wire passes over the second opening and the third opening, The second terminal comprises an arm and a plate-shaped insertion portion extending from the arm, The insertion portion is inserted into the slit from the first opening. An ignition coil in which the insertion portion is exposed from the second and third openings and in contact with the portion of the wire passing over the second and third openings.

2. The ignition coil according to claim 1, wherein the insertion portion protrudes outward from the second opening or the third opening.

3. The second terminal further comprises a side portion located on the outside in the width direction of the insertion portion, The ignition coil according to claim 1 or 2, wherein the wire is sandwiched between the insertion portion and the side portion.

4. The ignition coil according to claim 1 or 2, wherein the thickness of the insertion portion is smaller than the width of the slit.

5. The ignition coil according to claim 1 or 2, wherein the thickness of the insertion portion is the same as the width of the slit.

6. The aforementioned insertion portion has a shape in which a flat plate is folded back, and this folding creates a main portion and a folded portion in the insertion portion. The ignition coil according to claim 1 or 2, wherein the main portion and the folded portion are exposed from the second opening and the third opening and are in contact with the portion of the wire passing over the second opening and the portion of the wire passing over the third opening.

7. A first terminal comprising a bobbin having a first bottom surface, a second bottom surface and a side surface, and a wire wound on the side surface of the bobbin. and The second terminals that contact the wire at multiple portions of the aforementioned wire Equipped with, The second terminal comprises an arm and a pair of gripping plates extending from the arm, An ignition coil in which the pair of gripping plates clamp the bobbin from the outside of the wire.

8. The coil assembly includes a primary coil, a secondary coil, and an input terminal, and the connector section includes a connector terminal and an external terminal that connect to the input terminal. The ignition coil according to claim 1, 2, or 7, wherein the first terminal is the input terminal and the second terminal is the connector terminal.

9. A bobbin having a first bottom surface, a second bottom surface, and a side surface, wherein the bobbin is provided with a slit extending from the first bottom surface toward the second bottom surface, a first opening of the slit is provided on the first bottom surface, and a second opening of the slit extending from one end of the first opening and a third opening of the slit extending from the other end of the first opening are provided on the side surface, a step of preparing a bobbin, The process of winding a wire around the side of the bobbin so that it passes over the second and third openings to form the first terminal. and A step of inserting a plate-shaped insertion portion of a second terminal, having a width wider than the distance between the second and third openings, into the slit from the first opening, thereby causing the insertion portion to protrude from the second and third openings and come into contact with the wire. A method for manufacturing an ignition coil, including the method described above.

10. In the process of preparing the bobbin, the width of the slit is formed to be smaller than the thickness of the insertion portion. The method for manufacturing an ignition coil according to claim 9, wherein the insertion portion is inserted into the slit while expanding the slit.

11. The method for manufacturing an ignition coil according to claim 9, wherein in the step of preparing the bobbin, the width of the slit is formed to be greater than or equal to the thickness of the insertion portion.

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