JP2011165986A - Ignition coil for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ignition coil which do not generate defects due to welding and soldering, by not using welding and soldering, and which can be assembled readily. <P>SOLUTION: Terminals derived from a primary terminal 18c, a igniter terminal 24a, and a connector terminal 26a are connected each other with a bonding terminal 12, made of a conductive member such as metal with elasticity, and a resin stopper 16 made of resin is arranged on a portion in a approximately vertical direction, with respect to a case opening surface and on same plane as the connector 26. The resin stopper 16 includes a bonding terminal holder portion 14a for holding the bonding terminal 12, and a holder portion having a top holder portion 14b and made of resin. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a connection structure of a connector terminal, an igniter terminal, and a primary bobbin terminal of an ignition coil for an internal combustion engine.

  Conventionally, a coil part composed of a primary coil, a secondary coil and an iron core, an igniter for supplying a primary voltage and an ignition signal to the coil part, and the igniter and an external battery are connected to the coil housing part of the case. In an ignition coil for an internal combustion engine in which a coil housing portion of a case is filled with a mold resin, several methods for electrically connecting a primary terminal and a secondary terminal, an igniter terminal, and a connector terminal have been proposed. For the connection between each terminal of the ignition coil, several configurations have been proposed for the purpose of easiness of connection and improvement of reliability. As a typical example of this, for example, in Japanese Patent Application Laid-Open No. 11-050938 (hereinafter “Patent Document 1”), an ignition coil for an internal combustion engine that generates a high voltage to be applied to an ignition device of an internal combustion engine, the ignition coil An igniter accommodated in the igniter, and the connection terminals of the igniter are taken out in parallel from the igniter body on substantially the same virtual take-out plane, and at least one of the adjacent connection terminals is bent after taking out from the igniter body. In the electrical connection portion, a virtual straight line connecting the electrical connection portions adjacent to the connection terminal electrically connected to the external terminal in the ignition coil intersects the virtual take-out plane, and In the general connection portion, the connection terminal extends in the direction of taking out from the igniter body, and the adjacent connection terminal is in the opposite direction. And an ignition coil extending in a direction perpendicular to the imaginary extraction plane has been proposed.

  As another example, Japanese Patent Application Laid-Open No. 11-062800 (hereinafter “Patent Document 2”) is an internal combustion engine ignition coil that generates a high voltage to be applied to an ignition device of an internal combustion engine, and is an electron of the internal combustion engine. A plurality of external terminals electrically connected to the control device, an igniter body housed in the ignition coil, and a plurality of connection terminals taken out in parallel on substantially the same virtual extraction plane from the igniter body. A connection terminal having at least one adjacent connection terminal different in length from the other connection terminal, and a plurality of electrical connection portions that electrically connect the external terminal and the connection terminal in the ignition coil. And at least one of the electrical connection portions adjacent on the virtual extraction plane is different from the other electrical connection portion and the igniter body with the connection terminal and the outer An electrical connection portion provided at an intersection with the terminal, and the external terminal extends linearly toward the igniter body on the virtual extraction plane, and the connection terminal is on the virtual extraction plane. There has also been proposed an ignition coil that extends linearly from the igniter body in the take-out direction.

JP 11-050938 A Japanese Patent Laid-Open No. 11-062800

  However, the conventional ignition coil has the following problems. That is, in the ignition coil of the above-mentioned Patent Document 1, the connecting terminals of the igniter are taken out and bent alternately so as to intersect with each other. However, because of variations in welding or soldering, the adjacent terminals are mistakenly connected or the terminals are connected. There is a problem that reliability cannot be maintained due to a failure such as inaccurate connection.

  Further, in the ignition coil of Patent Document 2, the connector terminal or the igniter terminal is taken out on a plane and the length of one of the terminals is increased to increase the interval between the electrical connection portions. Since there are a plurality of terminals, there is a variation in welding or soldering. Therefore, there is a problem that reliability cannot be maintained due to a problem that the adjacent terminals are erroneously connected or the terminals cannot be correctly connected.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an ignition coil that can be easily assembled by eliminating the occurrence of defects due to welding or soldering without using welding or soldering.

  In order to solve the above problems, the present invention is configured as follows. That is, according to the first aspect of the present invention, a casing includes a coil portion including a primary coil, a secondary coil, and an iron core, and an igniter that controls driving of the coil portion. In an ignition coil for an internal combustion engine having a high voltage tower for supplying a high voltage to a power source and a connector portion for connecting an external power source and an ignition signal line, the casing being filled with mold resin, the primary coil connected to the primary coil A terminal, a secondary terminal connected to the secondary coil, an igniter terminal derived from the igniter, and a connector terminal accommodated in the connector, the primary terminal and the secondary terminal, an igniter terminal, At least two of the connector terminals are led out in the same direction, and a joining terminal for joining the lead-out terminals is provided, which is substantially perpendicular to the case opening surface of the case The resin stopper is disposed on the case, and the resin stopper is attached to the case along a part of the case from the case opening surface. The joint terminal is fixedly disposed on the resin stopper, and the resin stopper is An ignition coil for an internal combustion engine, wherein the joining terminal joins the derived terminals when a case is mounted.

  In the above configuration, the resin stopper has a holder for receiving the joint terminal, the joint terminal has elasticity to be fixed to the holder, and the resin stopper is attached to the case. Sometimes, the joining terminal accommodated in the holder portion may join between the terminals. The joining terminal may be accommodated in a holder, and the joining terminal may be elastic because it is fixed to the holder. Further, the resin stopper may be disposed on the same surface as the connector mounted on the case, and the primary terminal and the secondary terminal, the igniter terminal, and the connector terminal are substantially flat metal terminals. The primary terminal and the secondary terminal, the igniter terminal, and the connector terminal may be simultaneously connected by a plurality of the joining terminals, or the primary terminal, the secondary terminal, and the igniter terminal. The connector terminal may be led out in a direction perpendicular to the case opening surface and at the same height, and the lead-out terminal has a groove in at least one place for fitting the joining terminal. The connector terminal may be formed so as to run over the inner wall of the case on the same plane as the connector mounted on the case.

  As described above, by connecting the primary terminal and the secondary terminal, the igniter terminal, and the connector terminal with the joining terminal, there is no variation in the joining state, and it is possible to suppress the occurrence of defects and to easily assemble the ignition coil Can be realized.

1 is a perspective view of an ignition coil according to an embodiment of the present invention. It is AA sectional drawing seen from the arrow B direction of FIG. It is the C section enlarged view of FIG. It is a perspective view of the electrical connection part of a primary terminal, an igniter terminal, and a connector terminal. It is a perspective view of the junction terminal inserted in the holder. It is a perspective view of the junction terminal cut by the tie bar.

  The present invention is particularly characterized in the connection structure between the terminals derived from the primary coil, the igniter, and the connector, and these terminals can be easily connected to each other without welding or soldering. It is characterized by having a structure. There are a plurality of combinations such as a connector terminal and an igniter terminal, a connector terminal-primary coil terminal, or these three types of signals, a ground, and a power supply terminal. The number of sheets and this combination can be changed.

 FIG. 1 is a perspective view of an ignition coil according to an embodiment of the present invention according to an embodiment of the present invention, and FIG. In the ignition coil of the present invention, a coil portion is arranged outside a plug hole formed in an upper portion of an engine (not shown), and a high voltage generated from the coil portion is supplied to the ignition plug via a conductive member.

  1 and 2, the case 30 forming the coil portion of the ignition coil 10 is made of a resin and has a box shape. The case 30 is provided with a case fixing portion 30a for fixing to the engine. The case 30 includes an igniter 24 for controlling the ignition operation of the ignition coil, and an iron core 22 so that at least a part of the case 30 is accommodated. The outer side of the iron core 22 is provided on the outer periphery of the primary bobbin 18a. A primary coil 18 in which the primary winding 18b is wound about 100 turns, and a secondary coil 20b in which the secondary winding 20b is wound around the outer periphery of the secondary bobbin 20a on the outer side of the primary coil 18 about 8000 to 15000 turns. The coil 20 is disposed, and in the final stage of the assembly process, the inside of the case is filled with a thermosetting mold resin 34, so that the fixing and insulation of the respective constituent members are maintained. In the above configuration, the igniter 24 is vertically placed in a direction perpendicular to the case opening surface 30c, and the terminal extending direction is substantially parallel to the side surface of the case 30 so that the height direction dimension of the case 30 is kept low. This facilitates the connection between the connector terminal 26a and the primary terminal 18c. Further, a connector 26 for connecting a battery (not shown) and an ignition coil control unit such as an external ECU is provided on one side of the outer peripheral side surface of the case 30.

  Next, a connection structure between the terminals of the ignition coil according to the embodiment of the present invention will be described. In the present embodiment, the terminals derived from the primary coil 18, the igniter 24, and the connector 26 are connected by joint terminals. This specific structure is described below. FIG. 3 is an enlarged view of a portion C in FIG. 2, and FIG. 2 to 4, the primary terminal 18c, the igniter terminal 24a, and the connector terminal 26a have substantially flat metal terminals, and two of the primary terminal 18c, the igniter terminal 24a, and the connector terminal 26a are connected. The primary terminal 18c, the igniter terminal 24a, and the connector terminal 26a are connected in a direction perpendicular to the case opening surface 30c and at the same height. The connector terminals 26a are arranged over the inner wall of the case on the same plane as the connector 26 attached to the case 30. Further, the primary terminal 18c, the igniter terminal 24a, and the derived terminal of the connector terminal 26a are connected by a joining terminal 12 formed of a conductive member such as metal having elasticity, and the primary terminal 18a, the igniter terminal 24a, and the connector terminal 26a are simultaneously connected by a plurality of the joining terminals 12, and the primary terminal 18c, the igniter terminal 24a, and the portion of the connector terminal 26a that contacts the joining terminal 12 A groove portion 28 for engaging with the abutting portion is formed at one place. Further, a resin stopper 16 made of resin is disposed on a part of the case opening surface 30c in a substantially vertical direction and on the same surface as the connector 26, and the resin stopper 16 is provided with a case stopper 16a. The case 30 is formed with a resin stopper locking portion 30b, and the case locking portion 16a and the resin stopper locking portion 30b are fitted to each other so that the resin stopper 16 can be removed from the case opening surface 30c. Attached to the case 30 along a part of 30.

  Next, FIG. 5 shows a perspective view of the joining terminal inserted into the holder, and FIG. 6 shows a perspective view of the joining terminal cut by tie bar. 5 and 6, the resin stopper 16 has a holder portion 14 made of resin for receiving the joining terminal 12, and the holder portion 14 has a holder portion 14 for fixing the connection terminal 12. A junction terminal holding portion 14a and an upper fixing portion 14b are formed. In addition, the widest length L1 of the junction terminal 12 is longer than the distance L2 between the junction terminal holding portion 14a and the junction terminal holding portion 14a. It is fixed to the connection terminal holding part 14a. Further, after the joining terminal 12 is attached to the holder part 14, the tie bar 12b is cut to separate the joining terminal 12, and the joining part 12 is accommodated in the holder part 14 when the case is attached. Terminals 12 join between the terminals.

  As a modification of the above-described embodiment, the combination and lead-out position of the terminals connected by the joining terminal 12 are determined according to design circumstances from the terminals of the primary coil 18, the secondary coil 20, the igniter 24, and the connector 26. The number and position of the grooves 28 may be arbitrarily changed according to design circumstances. Further, the joining terminal 12 may be fixedly disposed on the resin stopper 16, the resin stopper 16 and the holder 14 may be provided individually, and the resin stopper 16 may be provided on the case opening surface 30c. As long as it is a part in a substantially vertical direction and a position where it is arranged in the case 30 along the part of the case 30 from the case opening surface 30c, it may be arbitrarily changed depending on the design circumstances. The material of the joining terminal 12 may be brass, stainless steel, aluminum, iron, phosphor bronze or the like, or may be subjected to surface treatment using tin plating or nickel plating. Further, the number and position of the groove portions 28 formed in the primary terminal 18c, the igniter terminal 24a, and the connector terminal 26a may be arbitrarily changed depending on design circumstances. Furthermore, the resin stopper 16 and the holder 14 may be made of PBT, PPE, nylon, PPS, PET, elastomer or the like. Further, conductive silicon 32 may be injected into the holder portion 14 to which the joining terminal 12 is mounted to maintain electrical continuity even after the molding resin 34 is filled. The conductive silicon 32 may be another conductive material that can be easily deformed. It may be replaced with a member having a property, for example, epoxy, urethane, acrylic, thermoplastic resin or the like.

10: Ignition coil
12: Junction terminal
12a: Bending part
12b: Tie bar
14: Holder part
14a: Junction terminal holding part
14b: Upper fixed part
16: Resin stopper
16a: Case locking part
18: Primary coil
18a: Primary bobbin
18b: Primary winding
18c: Primary terminal
20: Secondary coil
20a: Secondary bobbin
20b: Secondary winding
22: Iron core
24: Igniter
24a: Igniter terminal
26: Connector
26a: Connector terminal
28: Groove
30: Case
30a: Case fixing part
30b: Resin stopper
30c: Case opening surface
32: Conductive silicon
34: Mold resin
36: High pressure tower
38: Case opening surface

Claims (8)

A case includes a coil portion composed of a primary coil, a secondary coil, and an iron core, and an igniter that controls the driving of the coil portion. In the internal combustion engine ignition coil comprising a connector portion for connecting a power source and an ignition signal line, and filled with a mold resin in the case,
A primary terminal connected to the primary coil, a secondary terminal connected to the secondary coil, an igniter terminal derived from the igniter, and a connector terminal accommodated in the connector;
The primary terminal and the secondary terminal, an igniter terminal, and at least two of the connector terminals are led out in the same direction, and a joining terminal for joining the lead-out terminals is provided.
A resin stopper is disposed in a part of the case in a direction substantially perpendicular to the case opening surface,
The resin stopper is attached to the case along a part of the case from the case opening surface,
The joint terminal is fixedly arranged on the resin stopper,
An ignition coil for an internal combustion engine, wherein the joining terminal joins the derived terminals when the resin stopper is attached to a case. 2. The ignition coil according to claim 1, wherein the resin stopper has a holder for receiving the joining terminal,
The joining terminal has elasticity to be fixed to the holder part,
An ignition coil for an internal combustion engine, wherein the joining terminal accommodated in the holder portion joins between the terminals when the resin stopper is attached to the case. The ignition coil according to claim 1, wherein the joining terminal is accommodated in a holder,
An ignition coil for an internal combustion engine, wherein the joining terminal has elasticity to be fixed to the holder. 4. The ignition coil for an internal combustion engine according to claim 1, wherein the resin stopper is disposed on the same surface as the connector attached to the case. 5. 5. The ignition coil according to claim 1, wherein the primary terminal and the secondary terminal, the igniter terminal, and the connector terminal have a substantially flat metal terminal,
The ignition coil for an internal combustion engine, wherein the primary terminal, the secondary terminal, the igniter terminal, and the connector terminal are connected simultaneously by a plurality of the junction terminals. 6. The ignition coil according to claim 1, wherein the primary terminal, the secondary terminal, the igniter terminal, and the connector terminal are led out in a direction perpendicular to the case opening surface and at the same height. An ignition coil for an internal combustion engine. 7. The ignition coil for an internal combustion engine according to claim 1, wherein a groove portion is formed in at least one place for fitting the joining terminal in the derived terminal. 8. The ignition coil according to claim 1, wherein the connector terminal is disposed so as to run over the inner wall of the case on the same surface as the connector mounted on the case.

Images