JP4701633B2 - Ignition coil for internal combustion engine and method for manufacturing the same - Google Patents

Description

The present invention relates to an ignition coil for an internal combustion engine having a structure in which one end of a ground terminal is disposed on the inner periphery of a bobbin and is in electrical contact with an iron core, and a method for manufacturing the same.

  A conventional method for manufacturing this type of ignition coil for an internal combustion engine has been performed as shown in FIGS. 8A is a side view of the iron core, FIG. 8B is a longitudinal sectional view of a bobbin in which one end of the ground terminal is not bent and a coil wound around the bobbin, and FIGS. 9A and 9B are FIG. FIG. 10B is a longitudinal sectional view showing a direction in which one end of the ground terminal is bent and a right side view thereof, FIG. 10 is a longitudinal sectional view showing a process of fitting the coil winding bobbin on the iron core, and FIG. It is a longitudinal cross-sectional view which shows the state which fitted the coil winding bobbin in the predetermined position.

  A conventional ignition coil for an internal combustion engine is manufactured by winding a primary coil 3 around a laminated U-shaped iron core 1 shown in FIG. 8A and a resin-made primary bobbin 2 shown in FIG. 8B. We will use the ones that are equipped. The primary bobbin 2 has a structure in which flanges 2b project from both ends of a cylindrical body 2a.

  As shown in FIGS. 8B and 9A and 9B, the primary bobbin 2 has an intermediate portion of the plate-like ground terminal 4 on the side of the flange portion 2b, which is one end portion. It is supported. The tip 4a, which is one end of the ground terminal 4, is bent in the axial direction of the primary bobbin 2 as shown in FIG. 9A, and then contacts the inner periphery of the trunk 2a as shown in FIG. Wrap like so. A base end portion 4 b which is the other end of the ground terminal 4 protrudes in a direction orthogonal to the outer side in the radial direction of the primary bobbin 2.

  In such a state, the body portion 2a of the primary bobbin 2 around which the primary coil 3 is wound is fitted to the leg portion 1a of the iron core 1 on the tip portion 4a side of one end of the ground terminal 4 folded as shown in FIG. The tip 4a of the ground terminal 4 is moved along the leg 1a while contacting the leg 1a.

  As shown in FIG. 11, the primary bobbin 2 wound with the primary coil 3 is moved to a position where the primary bobbin 2 is positioned in the leg 1a.

In this case, the size of the hole of the body portion 2a of the primary bobbin 2 is set to the leg portion of the iron core 1 in order to ensure the retaining of the iron core 1 and the electrical contact between the tip portion 4a of the ground terminal 4 and the iron core 11. and smaller than the dimension of the 1a, was pressed while scraping body 2a of a resin molding primary bobbin 2.

  Thereafter, a secondary bobbin around which a secondary coil is wound is fitted and attached to the outer periphery of the primary bobbin 2 around which the primary bobbin 2 is wound.

In this way, an ignition coil for an internal combustion engine has been manufactured.
JP-A-60-233373 (FIG. 2)

  However, in such a conventional method for manufacturing an ignition coil for an internal combustion engine, the folded end portion 4a of one end of the ground terminal 4 contacts the leg portion 1a of the iron core 1, and the primary bobbin 2 is relatively press-fitted. Since the distance is long and the energy applied to the folded tip portion 4a of the ground terminal 4 is large, the tip portion 4a is bent or the body portion 2a of the primary bobbin 2 that is a resin molded product is scraped by the leg portion 1a of the iron core 1. Therefore, there is a problem that shavings of the primary bobbin 2 are generated.

  The object of the present invention is that no sliding resistance is applied when one of the bobbin and the iron core is slid into one end of the ground terminal existing on the inner periphery of the body of the bobbin, and when the fitting is finished, An object of the present invention is to provide an ignition coil for an internal combustion engine and a method for manufacturing the same that can sufficiently contact a ground terminal.

In the present invention, a coil is wound around a bobbin fitted to an iron core, and one end of a ground terminal supported on the end side of the bobbin is disposed on the inner periphery of the bobbin to be electrically contacted with the iron core, the earth and the other end of the pin protrudes on the outer circumference of said bobbin, one end of the other end to the coil of the ground terminal is directed to a ignition coils are electrically connected.

The ignition coil according to the present invention, is positioned so as to be disposed at a position where one end of the ground terminal disposed on the inner periphery of the bobbin spaced outwardly of the inner peripheral surface than the radial direction of the bobbin The bobbin is housed in a terminal housing recess, and the iron core is provided with a convex portion that contacts one end of the ground terminal corresponding to the end of the bobbin positioning portion . The bobbin fitted in the positioning position of the iron core has a locking projection at the end opposite to the convex portion of the iron core, and the locking projection of the bobbin is fitted into the locking groove of the iron core and locked. ing.

In the present invention, a coil is wound around a bobbin fitted to an iron core, and one end of a ground terminal supported on the end part side of the bobbin is folded back at the end part of the bobbin so as to be arranged on the inner periphery of the bobbin. which is electrically in contact with the iron core is, the other end of the ground terminal is protruded on an outer periphery of the bobbin, ignition internal combustion engine to which one end of the coil to the other end of the grounding terminal is electrically connected Intended for coils.

In the ignition coil for an internal combustion engine according to the present invention, one end of the ground terminal disposed on the inner periphery of the bobbin is positioned so as to be disposed at a position spaced radially outward from the inner peripheral surface of the bobbin. The bobbin is housed in a terminal housing recess, and the iron core is provided with a convex portion that contacts one end of the ground terminal corresponding to the end of the bobbin positioning portion. Also in this case, the bobbin fitted in the positioning position of the iron core has a locking projection at the end opposite to the convex portion of the core, and the locking projection of the bobbin is a locking groove of the core. Is fitted and locked.

Further, according to the present invention, a primary coil is wound around a primary bobbin fitted to an iron core, and one end of a ground terminal supported on the end side of the primary bobbin is disposed on the inner periphery of the primary bobbin. is in electrical contact with the core, the earth and the other end of the pin protrudes on the outer circumference of the primary bobbin, one end of the primary coil is electrically connected to the other end of the grounding terminal, the primary and the secondary bobbin fitted on an outer periphery of the coil, target ignition coil the secondary coil to the secondary bobbin is wound.

In the ignition coil for an internal combustion engine according to the present invention, one end of the ground terminal disposed on the inner periphery of the primary bobbin is disposed at a position spaced outward in the radial direction from the inner peripheral surface of the primary bobbin. The iron core is provided with a convex portion that contacts one end of the ground terminal corresponding to the end portion of the primary bobbin positioning portion. Also in this case, the primary bobbin fitted to the positioning position of the iron core has a locking projection on the end of the iron core opposite to the convex portion, and the locking projection of the primary bobbin It is fitted and locked in the locking groove of the iron core.

Further, according to the present invention, a primary coil is wound around a primary bobbin fitted to an iron core, and one end of the ground terminal supported on the end side of the primary bobbin is folded back at the end of the primary bobbin. wherein disposed on the inner periphery of the primary bobbin is electrically in contact with the core, the earth and the other end of the pin protrudes on the outer circumference of the primary bobbin, said primary coil to the other end of the ground terminal by one end of are electrically connected, and the secondary bobbin fitted on an outer periphery of said primary coil, target ignition coil the secondary coil to the secondary bobbin is wound.

In the ignition coil for an internal combustion engine according to the present invention, one end of the ground terminal disposed on the inner periphery of the primary bobbin is disposed at a position spaced radially outward from the inner peripheral surface of the primary bobbin. The iron core is provided with a convex portion that contacts one end of the ground terminal corresponding to the end portion of the positioning position of the primary bobbin. . The primary bobbin fitted in the positioning position of the iron core has a locking projection at the end of the iron core opposite to the convex portion, and the locking projection of the primary bobbin is related to the engagement of the iron core. It fits in the stop groove and is locked.

In the ignition coil for an internal combustion engine according to the present invention, one end or the folded portion of the ground terminal disposed on the inner periphery of the bobbin is positioned so as to be disposed at a position spaced radially outward from the inner peripheral surface of the bobbin. since housed in the terminal housing recess of the bobbin Te, the bobbin by sliding either one is fitted to the iron core in positioning the bobbin positioning portion of the iron core, one end or folded portion of the ground terminal carried by the bobbin It is possible to prevent contact with the iron core . Therefore, there is no frictional resistance applied to one end or the folded portion of the ground terminal during sliding, and it is possible to prevent the one end or the folded portion of the ground terminal from being broken and the bobbin being a resin molded product from being scraped by the iron core. It is possible to prevent bobbin shavings from coming out.

Further, since the iron core projecting portion is provided in contact with one end or folded portion of the ground terminal in response to the end of the positioning portion of the bobbin, perform sufficient contact between the iron core and the earth terminal in the fitting completion state Can be made.

In the present invention, the bobbin fitted in the positioning position of the iron core has a locking projection on the end opposite to the convex portion of the core, and the locking projection of the bobbin is fitted in the locking groove of the core. since the locked Te, to prevent relative movement between the bobbin and the iron core, it is possible to prevent the the convex portion of the one or the folded portion and the core of the ground terminal is spaced apart, one or wrapping ground terminal stabilization of electrical contact between the convex portion of the parts and the core can be achieved.

  Hereinafter, a first example of the best mode for carrying out an ignition coil for an internal combustion engine and a method for manufacturing the same according to the present invention will be described in detail with reference to FIGS. 1A is a side view of an iron core, FIG. 1B is a longitudinal sectional view of a bobbin in which one end of a ground terminal is not bent and a coil wound around the bobbin, and FIGS. 2A and 2B are FIG. FIG. 3B is a longitudinal sectional view showing a direction in which one end of the ground terminal is bent and a right side view thereof, FIG. 3 is a longitudinal sectional view showing a process of fitting the coil winding bobbin on the iron core, and FIG. Fig. 5 is a longitudinal sectional view showing a state where the coil winding bobbin is fitted at a predetermined position, and Fig. 5 is an enlarged view of a main part in Fig. 4.

  The structure of the ignition coil for an internal combustion engine will be described together with its manufacturing method using these drawings.

  The ignition coil for the internal combustion engine of this example is manufactured by arranging the primary coil 3 on the laminated U-shaped iron core 1 shown in FIG. 1A and the resin-made primary bobbin 2 shown in FIG. This is done using a wound one.

  The primary bobbin 2 has a structure in which flanges 2b project from both ends of a cylindrical body 2a. The tip 4a, which is one end of the ground terminal 4 arranged on the inner periphery of the primary bobbin 2, is positioned so as to be spaced radially outward from the inner peripheral surface of the primary bobbin 2. The next bobbin 2 is housed in the terminal housing recess 5. That is, a terminal housing recess 5 is provided in advance on a part of the inner periphery of the primary bobbin 2 at one end, and in this state, the tip 4a at one end of the ground terminal 4 is as shown in FIG. Then, after being bent in the axial direction of the primary bobbin 2, it is folded back to the inner periphery of the body 2a as shown in FIG. The depth of the bobbin radial direction of the terminal housing recess 5 is such that the tip 4a of the ground terminal 4 is primary when the tip 4a at one end of the ground terminal 4 is housed in this terminal housing 5 as shown in FIG. The depth of the bobbin 2 is spaced from the inner peripheral surface to the outside in the radial direction. The base end portion 4 b at the other end of the ground terminal 4 protrudes in a direction orthogonal to the outside in the radial direction of the primary bobbin 2.

  The leg portion 1a of the iron core 1 is provided with a convex portion 6 that contacts the folded end portion 4a of one end of the ground terminal 4 corresponding to the end portion of the positioning position of the primary bobbin 2. The convex part 6 of this example is formed by increasing the radial dimension of the leg part 1 a of the iron core 1 ahead of the position where the primary bobbin 2 is positioned in the leg part 1 a of the iron core 1. In this case, the radial dimension of the leg portion 1a that relatively slides the primary bobbin 2 is such that the trunk portion 2a of the primary bobbin 2 can be fitted to the portion 1a and moved relatively.

  The primary bobbin 2 fitted in the positioning portion of the leg portion 1 a of the iron core 1 has a locking projection 7 at the end opposite to the convex portion 6 of the iron core 1. A locking groove 8 into which the locking projection 7 is fitted is provided below the bobbin positioning portion of the leg portion 1a of the iron core 1.

  In this state, the body portion 2a of the primary bobbin 2 around which the primary coil 3 is wound is fitted to the leg portion 1a of the iron core 1 on the side of the tip portion 4a of the ground terminal 4 folded as shown in FIG. The bobbin 2 is moved relative to the leg 1a of the iron core 1.

  As shown in FIG. 4, the primary bobbin 2 wound with the primary coil 3 is moved to a position where the primary bobbin 2 is positioned in the leg 1a. When the primary bobbin 2 reaches the positioning position of the leg portion 1 a, the folded end portion 4 a of one end of the ground terminal 4 comes into contact with the convex portion 6 in the leg portion 1 a of the iron core 1.

  In this state, as shown in FIGS. 4 and 5, the locking projection 7 is formed on the end of the primary bobbin 2 on the side opposite to the convex portion 6 of the leg 1 a of the iron core 1, and the locking groove of the leg 1 a. 8 fits. For this reason, when the primary bobbin 2 around which the primary coil 3 is wound is positioned at the position where the leg 1a is positioned, the primary bobbin 2 is locked so that it cannot move relative to the leg 1a.

  Thereafter, a secondary bobbin around which a secondary coil is wound is fitted and attached to the outer periphery of the primary bobbin 2 around which the primary bobbin 2 is wound.

  In this way, the ignition coil for the internal combustion engine is manufactured.

  In the ignition coil for the internal combustion engine of this example, the tip portion 4a which is a folded portion of one end of the ground terminal 4 arranged on the inner periphery of the primary bobbin 2 has a diameter from the inner peripheral surface of the trunk portion 2a of the primary bobbin 2. Since it is positioned so as to be separated from the outside in the direction and is accommodated in the terminal accommodating recess 5 of the primary bobbin 2, the body 2a of the primary bobbin 2 is fitted into the iron core 1 and one of them is slid to 1 When positioning the secondary bobbin 2 at the positioning position on the leg 1 a of the iron core 1, the tip 4 a that is a folded portion of one end of the ground terminal 4 supported by the primary bobbin 2 contacts the leg 1 a of the iron core 1. Therefore, at the time of sliding, the tip portion 4a which is a folded portion of one end of the ground terminal 4 is not subjected to frictional resistance, and the tip portion 4a which is the folded portion of one end of the ground terminal 4 is broken, or the leg of the iron core 1 is broken. Part 1a is a resin molded product It prevents the body 2a of the primary bobbin 2 is cut, it is possible to prevent the shavings of the primary bobbin 2 exits.

  Moreover, since the leg part 1a of the iron core 1 is provided with the convex part 6 which contacts the front-end | tip part 4a which is the folding | turning part of the end of the ground terminal 4 corresponding to the edge part of the positioning location of the primary bobbin 2, In the fitted end state, the contact of the ground terminal 4 with the iron core 1 can be sufficiently performed.

  In this case, the primary bobbin 2 fitted in the positioning portion of the leg portion 1a of the iron core 1 has a locking projection 7 at the end opposite to the convex portion 6 of the leg portion 1a of the iron core 1. Since this locking projection 7 of the bobbin 2 is fitted and locked in the locking groove 8 of the leg 1 a of the iron core 1, relative movement between the primary bobbin 2 and the iron core 1 is prevented, and one end of the ground terminal 4 is prevented. The tip portion 4a, which is a folded portion of the iron core 1, is prevented from being separated from the convex portion 6 of the leg portion 1a of the iron core 1, and the tip portion 4a, which is a one-end folded portion of the ground terminal 4, and the convex portion 6 of the leg portion 1a of the iron core 1 The electrical contact state can be stabilized.

  Further, in the method for manufacturing an ignition coil for an internal combustion engine according to the present example, the tip end portion 4 a that is a folded portion of one end of the ground terminal 4 disposed on the inner periphery of the primary bobbin 2 is connected to the body portion 2 a of the primary bobbin 2. Since the terminal bobbin 2 is positioned so as to be spaced apart from the inner peripheral surface in the radial direction and is housed in the terminal housing recess 5, either the body portion 2 a of the primary bobbin 2 is fitted to the iron core 1. When the primary bobbin 2 is positioned at the positioning position on the leg portion 1a of the iron core 1 by sliding the end of the iron core 1, the tip end portion 4a that is a folded portion of one end of the ground terminal 4 supported by the primary bobbin 2 is Since it is not in contact with the leg portion 1a, a frictional resistance is not applied to the tip portion 4a which is a folded portion of one end of the ground terminal 4 during sliding, and the tip portion 4a which is a folded portion of one end of the ground terminal 4 is broken. , Leg 1a of iron core 1 It prevents the body 2a of a resin molding primary bobbin 2 is cut, it is possible to prevent the shavings of the primary bobbin 2 exits.

  Moreover, since the leg part 1a of the iron core 1 is provided with the convex part 6 which contacts the front-end | tip part 4a which is the folding | turning part of the end of the ground terminal 4 corresponding to the edge part of the positioning location of the primary bobbin 2, In the fitted end state, the contact of the ground terminal 4 with the iron core 1 can be sufficiently performed.

  FIG. 6 shows a longitudinal sectional view of a second example of the ignition coil for an internal combustion engine according to the present invention. In this example, parts corresponding to those in the first example are denoted by the same reference numerals.

  In the ignition coil for an internal combustion engine of this example, an I-shaped one is used as the iron core 1. The iron core 1 is provided with a convex portion 6 provided corresponding to the end portion of the positioning portion of the primary bobbin 2 so as to protrude outward in the radial direction only at this portion. Other configurations are the same as in the first example.

  Even with such a configuration, the same effect as in the first example can be obtained.

  FIG. 7 is a longitudinal sectional view of a third example of the ignition coil for an internal combustion engine according to the present invention. In this example, parts corresponding to those in the first example are denoted by the same reference numerals.

  In the ignition coil for an internal combustion engine of this example, an E-shaped one is used as the iron core 1. The body portion 2a of the primary bobbin 2 is fitted to the center leg portion 1a of the E-shaped iron core 1 in the same manner as in the first example, and has the same configuration as in the first example.

  Even with such a configuration, the same effect as in the first example can be obtained.

  In the above example, the tip 4a at one end of the ground terminal 4 is folded and stored in the terminal storage recess 5 on the inner peripheral side of the body 2a of the primary bobbin 2, but the tip 4a at one end of the ground terminal 4 is folded. Instead of returning, it may be positioned and stored in the terminal storing recess 5 through the flange portion 2b so as to be separated from the inner peripheral surface of the body portion 2a of the primary bobbin 2 in the radial direction.

(A) is a side view of the iron core in the first example of the best mode for carrying out the ignition coil for an internal combustion engine and the manufacturing method thereof according to the present invention, (B) is a bobbin in which one end of the ground terminal is not bent, and this It is a longitudinal cross-sectional view of the coil wound around. (A) (B) is the coil winding bobbin shown to FIG. 1 (B), The longitudinal cross-sectional view which shows the direction which bends the end of an earth terminal, and its right view. It is a longitudinal cross-sectional view which shows the process of fitting a coil winding bobbin to an iron core in this example. It is a longitudinal cross-sectional view which shows the state which fitted the coil winding bobbin in the predetermined position of the iron core in this example. It is a principal part enlarged view in FIG. It is a longitudinal cross-sectional view of the 2nd example of the ignition coil for internal combustion engines which concerns on this invention. It is a longitudinal cross-sectional view of the 3rd example of the ignition coil for internal combustion engines which concerns on this invention. (A) is a side view of an iron core used in a conventional method for manufacturing an ignition coil for an internal combustion engine, and (B) is a longitudinal sectional view of a bobbin in which one end of a ground terminal is not bent and a coil wound around the bobbin. (A) (B) is the coil winding bobbin shown to FIG. 8 (B), and is the longitudinal cross-sectional view which shows the direction which bends the end of a ground terminal, and its right view. It is a longitudinal cross-sectional view which shows the process of fitting a coil winding bobbin in the iron core of a prior art example. It is a longitudinal cross-sectional view which shows the state which fitted the coil winding bobbin in the predetermined position of the iron core of a prior art example.

DESCRIPTION OF SYMBOLS 1 Iron core 1a Leg part 2 Primary bobbin 2a trunk | drum 2b collar part 3 Primary coil 4 Ground terminal 4a The front-end | tip part which is one end of an earth terminal 4b The base end which is the other end of an earth terminal Locking protrusion 8 Locking groove

Claims (4)

A coil is wound around a bobbin fitted to the iron core, and one end of a ground terminal supported on the end side of the bobbin is disposed on the inner periphery of the bobbin to be in electrical contact with the iron core. the other end protrudes to the outer periphery of the bobbin, the ignition coil for an internal combustion engine to which one end of the coil to the other end of the grounding terminal is electrically connected,
One end of the ground terminal disposed on the inner periphery of the bobbin is positioned so as to be disposed at a position spaced radially outward from the inner peripheral surface of the bobbin , and a terminal storage recess provided on the bobbin Stored in
The iron core is provided with a convex portion that contacts one end of the grounding terminal corresponding to the end of the positioning portion of the bobbin ,
The bobbin fitted in the positioning position of the iron core has a locking projection at the end opposite to the convex portion of the iron core,
The locking projection of the bobbin is locked by being fitted into a locking groove of the iron core;
An ignition coil for an internal combustion engine. A coil is wound around a bobbin fitted to the iron core, and one end of the ground terminal supported on the end side of the bobbin is folded at the end of the bobbin so that it is disposed on the inner periphery of the bobbin and is attached to the iron core. are in electrical contact, the other end of the ground terminal is protruded on the outer periphery of the bobbin, one end of the coil to the other end of the ground terminal is in the ignition coil for an internal combustion engine are electrically connected,
One end of the ground terminal disposed on the inner periphery of the bobbin is positioned so as to be disposed at a position spaced radially outward from the inner peripheral surface of the bobbin, and is stored in the terminal storage recess of the bobbin. ,
The iron core is provided with a convex portion that contacts one end of the ground terminal corresponding to the end of the bobbin positioning portion ,
The bobbin fitted in the positioning position of the iron core has a locking projection at the end opposite to the convex portion of the iron core,
The locking projection of the bobbin is locked by being fitted into a locking groove of the iron core;
An ignition coil for an internal combustion engine. A primary coil is wound around a primary bobbin fitted to an iron core, and one end of a ground terminal supported on the end side of the primary bobbin is disposed on the inner periphery of the primary bobbin to electrically connect to the iron core. The other end of the ground terminal protrudes from the outer periphery of the primary bobbin, one end of the primary coil is electrically connected to the other end of the ground terminal, and 2 is connected to the outer periphery of the primary coil. In an internal combustion engine ignition coil in which a secondary bobbin is fitted and a secondary coil is wound around the secondary bobbin,
One end of the ground terminal disposed on the inner periphery of the primary bobbin is positioned so as to be disposed at a position spaced radially outward from the inner peripheral surface of the primary bobbin, and the terminal of the primary bobbin Stored in the storage recess,
The iron core is provided with a convex portion that contacts one end of the ground terminal corresponding to the end portion of the positioning position of the primary bobbin,
The primary bobbin that is fitted in the positioning location of the iron core has a locking projection at an end opposite to the convex portion of the iron core,
The locking projection of the primary bobbin is fitted and locked in a locking groove of the iron core;
An ignition coil for an internal combustion engine. A primary coil is wound around a primary bobbin fitted to an iron core, and one end of a ground terminal supported on the end side of the primary bobbin is folded back at the end of the primary bobbin, whereby the primary bobbin The other end of the ground terminal protrudes from the outer periphery of the primary bobbin, and one end of the primary coil is electrically connected to the other end of the ground terminal. An internal combustion engine ignition coil in which a secondary bobbin is fitted on the outer periphery of the primary coil, and the secondary coil is wound around the secondary bobbin;
One end of the ground terminal disposed on the inner periphery of the primary bobbin is positioned so as to be disposed at a position spaced radially outward from the inner peripheral surface of the primary bobbin, and the terminal of the primary bobbin Stored in the storage recess,
The iron core is provided with a convex portion that contacts one end of the ground terminal corresponding to the end portion of the positioning position of the primary bobbin,
The primary bobbin that is fitted in the positioning location of the iron core has a locking projection at an end opposite to the convex portion of the iron core,
The locking projections of the primary bobbin are fitted and locked in the locking grooves of the iron core;
An ignition coil for an internal combustion engine.

Images