KR20190122428A - High Energy Ignition Coil for Vehicle - Google Patents

Abstract

Disclosed is an ignition coil which can minimize the loss factor through application of a closed magnetic circuit-type core for minimizing the magnetic path leakage, thereby increasing discharge efficiency and at the same time, minimizing the cross-sectional area of an iron core (core) to implement the miniaturization and lightening of a product, thereby increasing economical efficiency. A case (20) of the ignition coil is shaped to correspond to a plug top type. An I-type core (30) is inserted into an O-type core (34) after the assembly of first and second bobbin assemblies (40, 50) while being inserted into the first bobbin assembly (40). A permanent magnet (34) is inserted into a predetermined gap formed between one end of the I-type core (30) and one inner surface of the O-type core (34). The first bobbin assembly (40) is inserted into the second bobbin assembly (50). A secondary coil (54) is wound in winding regions divided by a plurality of protrusions (55) protruding from the outer surface of the second bobbin assembly (50). A connector (60) and a PCB module (70) are coupled to one side of the case (20). A boot (80) is coupled to a lower portion of the case (20). An H/V spring (90) is inserted into the boot (80).

Description

High Energy Ignition Coil for Vehicle

The present invention relates to an ignition coil with improved discharge efficiency, which minimizes the loss rate through application of a closed furnace core that minimizes magnetic leakage, thereby improving discharge efficiency and minimizing the cross-sectional area of the core (core). The present invention relates to a high efficiency ignition coil for automobiles, which is economical by implementing miniaturization and light weight.

In general, an ignition coil generates an electric flame discharge on a spark plug by receiving an ignition signal from an engine control unit (ECU) to generate a high voltage of several tens of KV from a low voltage of a battery. It is an important component of an engine that allows an automobile to be driven by the piston movement of the engine by the explosive force of the mixed gas.

The first ignition coil was used by winding the bobbin of the branch pipe type and filling it with oil to insulate the high pressure.While gradually improving the technology, the coil was wound on the plastic section bobbin and insulated with epoxy. Rapid advances have been made, and for a long time, high voltages were delivered to the engine at the right time without the need for a distributor of cars.

Recently, due to the development and miniaturization of the electronics industry, and the pursuit of convenience of after-sales service, it is directly connected to the spark plug by directly attaching to each cylinder of the engine. Cigar) type ignition coils have been developed and are currently being used in many new models.

The global trend in the ignition system of the automotive industry is increasingly requiring the development of highly efficient ignition coils. However, pencil type ignition coils, which are the main products of commercial ignition coils, cannot satisfy this. One of the reasons is the size and structural limitation of the core (iron core) which induces high voltage by increasing the strength of the magnetic force induced in the primary and secondary coils of the ignition coil.

 Iron core is a very important factor that affects output voltage and spark energy by changing L (inductance) value according to cross-sectional area, gap, material, etc. It is a component for the purpose of increasing the strength of the desired magnetic force by increasing the cross-sectional area. The iron core structure of the pencil coil is “I-shaped”, which means that the cross-section of the iron core is smaller than other types such as the plug top type, so the strength of the magnetic force is small. Due to the large loss rate, it is very difficult to obtain high efficiency discharge energy.

Republic of Korea Patent Publication No. 10-0561173 (Registration Date: March 08, 2006) Republic of Korea Patent Publication No. 10-0941712 (Registration Date: February 03, 2010) Republic of Korea Patent Publication No. 10-0701572 (Registration Date: March 23, 2007)

The technical problem to be solved by the present invention is to improve the discharge efficiency by minimizing the loss rate through the application of a closed core to minimize the self-leakage in order to maximize the discharge energy of the ignition coil according to the international development trend The aim is to provide an automotive ignition coil with economical efficiency by minimizing the cross-sectional area of the core (core) to realize miniaturization and light weight.

In addition, the technical problem to be solved by the present invention is to provide a highly efficient ignition coil that can be compacted by attaching a permanent magnet to the core (core) and the connection portion of the iron core to increase the strength of the magnetic force.

In order to solve the above technical problem, the present invention is an ignition coil,

An enclosure having an upper opening-An extension part is integrally formed at one side of the case, and a bushing is inserted into the extension part, and a protrusion extends by a predetermined length in a vertical downward direction on the lower surface of the case. An H / V contact is formed in the protrusion to transmit high pressure to the spark plug of the engine;

An eye (I) type core, an oh type (O) type core, and a permanent magnet disposed in the case;

The eye (I) core has a first body in the form of a hollow rectangular bar so that it can be inserted therein, an extension part is formed on one end of the first body and the first fastening part protrudes on the other end of the first body. A primary bobbin assembly having a primary coil wound on an outer surface of the first body between the extension part and the first fastening part;

The first bobbin assembly has a hollow second body to be inserted therein, one end of the second body is formed with a terminal insertion portion, the other end is formed with a second fastening portion protruding, the second fastening portion A secondary bobbin assembly in which a secondary coil is wound on an outer surface of the second body between the terminal insertion portion and a terminal insertion portion;

A connector and a PCB module coupled to one side of the case;

An insertion hole into which the protrusion is fitted is formed at a central portion, and a boot is coupled to a lower portion of the case; And

It provides an ignition coil, characterized in that it comprises an H / V spring is inserted into the boot.

A pair of first partition walls are formed in the case, and the first partition walls are disposed to be spaced radially inwardly from the outer wall of the case and are arranged in a first space defined by the first partition walls. The bobbin assembly and the secondary bobbin assembly are disposed, and the O-type core is disposed in the second space defined by the outer wall and the first partition wall, and the primary bobbin assembly is formed of the secondary bobbin assembly. The I-type core and the O-type in which the coupling structure of the primary bobbin assembly and the secondary bobbin assembly are inserted into the case with the secondary bobbin assembly inserted into the secondary bobbin assembly through a side surface. It is characterized in that it is coupled vertically inside the coupling structure of the core.

The eye type I core is inserted into the type O core after assembly of the primary bobbin assembly and the secondary bobbin assembly in a state of being inserted into the primary bobbin assembly, and the eye I The permanent magnet is inserted into a predetermined gap formed between one end portion of the mold core and one inner surface of the oh-type core.

A second partition wall is formed in front of the case, and the PCB module is disposed in a third space defined by the second partition wall and the front wall of the case, and the connector is mounted by fitting the front wall. A fitting groove is formed so that the outer wall of the case is formed to have a predetermined thickness.

The connector includes a hollow rectangular parallelepiped third main body and an insertion part extending obliquely downward from one end of the third main body, and a third coupling part protrudes from an upper surface of the third main body. The second fastening part may be fastened to a third fastening part, and the connector may include a plurality of terminals exposed from the inside of the main body to the outside through the insertion part.

The terminals are made of 4-pin type terminals, and when the connector is coupled to the case, the terminals are inserted and fastened to the terminal insertion portion, and the outer circumferential surface of the insertion portion is thin so as to fit into the fitting groove. Characterized in that formed.

A plurality of protrusions are formed to protrude on the outer surface of the second body, the outer surface of the second body has a winding region divided by the protrusions, the secondary coil is wound around each winding region It is done.

The area in which the winding is provided by the winding regions is characterized by a margin of 22% relative to the area for the total number of windings of the coil.

As mentioned above, according to the present invention, the case of the ignition coil is shaped to conform to the plug top type, and the arrangement structure of the I type core, the O type core and the permanent magnet is described. And the winding technology of the secondary coil. In addition, after placing each component in the case, the epoxy injection was optimized and the vehicle (engine) mounting environment was improved. Through this structural improvement, the discharge energy was improved by about 30% or more compared to the ignition coil of the same size as before. Therefore, the effect of increasing exports and creating jobs by domestic production can be obtained through strengthening international competitiveness.

1 is an exploded perspective view of an ignition coil according to a preferred embodiment of the present invention;
Figure 2 is a cross-sectional view of the coupling state of the ignition coil shown in FIG.
3 is an enlarged view of the case shown in FIG. 1;
FIG. 4 is a diagram illustrating a coupling structure of an I type core and an O type core shown in FIG. 1;
5 is a view showing the structure of the primary bobbin assembly shown in FIG.
6 is a view showing the structure of the secondary bobbin assembly shown in FIG. And
7 is a view showing the structure of the connector shown in FIG.

The drawings in the present application and their accompanying detailed description are directed to merely exemplary embodiments of the invention. Advantages and other features of the mechanisms and methods disclosed herein will become more apparent to those skilled in the art through a detailed description with reference to the accompanying drawings, which illustrate representative embodiments of the present invention.

Hereinafter, an ignition coil according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 schematically show the overall structure of the ignition coil.

1 and 2, the ignition coil 10 according to the preferred embodiment of the present invention is a case 20, the upper portion of the enclosure shape, the eye I is inserted into the case 20 is disposed The core 30, the O-type core 34 and the permanent magnet 32, the primary bobbin assembly 40 and the secondary bobbin assembly 50, the connector is coupled to one side of the case 20 60 and the PCB module 70, the boot (Boot) 80 is coupled to the lower portion of the case 20, and includes a H / V spring 90 is inserted into the boot (80).

The ignition coil according to the present invention was conceived as a plug top type ignition coil coupled to the top of the spark plug. The plug-top type ignition coil has an advantage of securing ignition energy because it can secure the size of the coil part constituting the magnetic force line, compared to the pencil type.

To this end, first, the case 20 is designed to be strong in shock resistance and easy to fasten with the engine because it is mounted on an engine of a vehicle. 3 shows an enlarged structure of the case 20. As shown in FIG. 3, an arc-shaped expansion portion 21 is integrally formed at one front side of the case 20, and a vertical through hole may be inserted into the expansion portion 21 so as to insert the bushing 22. 23 is formed. The bushing 22 serves as a support when fixing the ignition coil bolt, and has a cylindrical pillar shape, and a plurality of holes 24 penetrate through the radial side wall thereof. A protrusion 25 is formed at the bottom of the case 20, and the protrusion 25 is formed by extending a predetermined length in the vertical downward direction on the bottom surface of the case 20. The protrusion 25 is fitted into the insertion hole 82 formed in the central portion of the boot 80 to be described later. The protrusion 25 is provided with an H / V contact 12 which transmits high pressure to the spark plug of the engine.

A pair of first partitions 26 are formed inside the case 20, and the first partitions 26 are spaced apart from the outer wall 27 of the case 20 radially inwardly by a predetermined distance, and are arranged in a first manner. The primary bobbin assembly 40 and the secondary bobbin assembly 50 are disposed in the first space S1 defined by the partition wall 26. An O-type core 34 is disposed in the second space S2 defined by the outer wall 27 and the first partition 26 of the case 20, and between the O-core cores 34. An eye (I) type core 30 is disposed in the. A second partition wall 28 is formed in front of the case 20, and the PCB module 70 is formed in the third space S3 defined by the second partition wall 28 and the front wall 29 of the case 20. ) Is placed. The PCB module 70 is inserted and disposed in the third space S3 to suppress electrical noise and EMI. The front wall 29 is provided with a fitting groove 29a so that the connector 60, which will be described below, can be mounted by fitting. The outer wall 27 of the case 20 is formed to have a certain thickness in order to prevent shape deformation during injection.

4 illustrates a coupling structure of the eye type I core 30 and the type O core 34.

1 to 4, the primary bobbin assembly 40 and the secondary bobbin assembly 50 in a state where the primary bobbin assembly 40 is inserted therein through the side of the secondary bobbin assembly 50. The coupling structure of the, is adopted to the structure that is vertically coupled to the interior of the coupling structure of the (I) type core 30 and the (O) type core (34) inserted into the case 20.

To this end, in the state in which the I-type core 30 is inserted into the inside of the primary bobbin assembly 40, after the assembly of the primary bobbin assembly 40 and the secondary bobbin assembly 50, O (O) The method was inserted into the mold core 34. At this time, the permanent magnet 34 may be inserted with a certain gap, preferably about 1 mm, between the one end of the I-type core 30 and the inner surface of one side of the O-type core 34. Designed to be able to structure. By inserting the permanent magnet 34 between the eye (I) core 30 and the oh (O) core 34, the density of the magnetic force line can be increased to ensure the ignition energy of the ignition coil. At this time, it is important to determine the size of the gap. If the gap is too small, it is impossible to insert it. On the contrary, if the gap is too large, the magnetic lines are lost and the magnetic flux density is reduced. Preferably, the permanent magnet 34 used a permanent magnet of the ND Type.

5 shows the structure of the primary bobbin assembly 40.

As shown in FIG. 5, the primary bobbin assembly 40, as mentioned above, has a first body 41 in the form of a hollow rectangular rod so that the eye I-shaped core 30 can be inserted therein. Has An extension part 42 is formed at one end of the first main body 41, and a first fastening part 43 for engaging with the secondary bobbin assembly 50 is formed to protrude from the other end. The primary coil 44 is wound on the outer surface of the first body 41 between the expansion portion 42 and the first fastening portion 43. It is important to keep the winding of the primary coil 44 such that the coil is an alignment winding. This is because when the alignment winding is not possible, assembly is impossible due to coil interference when assembling with the secondary bobbin assembly 50 and the coil coating may be damaged. The primary coil wound on the outer surface of the first body 41 of the primary bobbin assembly 40 serves to generate an induced voltage by the ECU on-off signal.

After coil winding, the eye (I) type core 30 was assembled in the direction of the inner side of the first body 41 of the primary bobbin assembly 40 and was able to be inserted in close contact with the first body 41. The permanent magnet 32 is attached to the exposed surface of the eye (I) core 30. The primary bobbin assembly 40 is made of thermoplastic engineering plastic, and preferably made of polyester-based polybutylene terephthalate (PBT).

6 shows the structure of the secondary bobbin assembly 50.

As shown in FIG. 6, the secondary bobbin assembly 50 has a hollow second body 51 so that the primary bobbin assembly 40 can be inserted therein as mentioned above. The terminal insertion part 52 is formed at one end of the second main body 41, and the second fastening part 53 for coupling with the connector 60, which will be described later, is formed to protrude from the other end. In this case, the second fastening portion 53 and the terminal insertion portion 52 are formed at positions symmetrical in the diagonal direction with respect to the second body 51.

The secondary coil 54 is wound on the outer surface of the second body 51 between the second fastening portion 53 and the terminal insertion portion 52. Secondary coils 54, unlike primary coils 44, have a very thin wire diameter and require winding technology. In particular, if the coil is not completely crossed over the section of the bobbin during winding, there may be a fatal failure due to the high-voltage potential difference. In addition, a winding failure may occur if equipment shake or the shaft of the bobbin shaft is misaligned.

In order to solve this problem, a plurality of protrusions 55 protrude on the outer surface of the second body 51. The outer surface of the second body 51 has winding regions divided by the protrusions 55. Preferably, seven winding regions of A, B, C, D, E, F, and G are shown as shown in the drawing. Have The number of turns for each winding area is 400 times in the A area, 1300 times in the B area, 1300 times in the C area, 1600 times in the D area, 1600 times in the E area, 1600 times in the F area, 1500 circuits in the G area, and 9,300 times in total. The available winding area provided by the winding areas should be 22% of the total winding area in order to allow winding. The secondary coil wound on the outer surface of the second body 51 of the secondary bobbin assembly 50 serves to generate secondary induced electromotive force by the primary induced voltage. The secondary bobbin assembly 50 is made of an engineering thermoplastic that exhibits high temperature resistance, and is preferably made of polyphenylene ether (PPE).

7 shows the structure of the connector 60.

The connector 60 includes a hollow body-like third body 61 and an insertion part 62 extending obliquely downward from one end of the third body 61. A third fastening part 65 protrudes from an upper surface of the third body 61, and the third fastening part 65 has a second fastening part 53 of the secondary bobbin assembly 50 mentioned above. It is configured not to be fastened and separated. The connector 60 includes a plurality of terminals 63 exposed from the inside of the main body 61 to the outside via the insertion portion 62. The terminals 63 were configured as 4-pin type terminals compatible with the mass production target vehicle. When the connector 60 is coupled to the case 20, the terminals 63 are inserted into the terminal insert 52 of the secondary bobbin assembly 50 to be fastened. The lower portion of the insertion portion 62 is formed thin in a plate shape, the outer peripheral surface 64 of the insertion portion 62 is formed thin so that it can be fitted into the fitting groove (29a) formed in the front wall (29). The connector 60 is preferably made of polybutylene terephthalate (PBT), which is polyester based.

According to a preferred embodiment of the present invention, the eye (I) type core 30 and the oh type (O) core 34, the primary and secondary bobbin assemblies 40 and 50, the connector 60 as described above And after placing the PCT module 70, epoxy is enclosed in the bobbin assemblies 40 and 50 and the cores 30 and 34, thereby fixing the position of each component and protecting each component from external shock and Discharge due to no generation was prevented. Sufficient preheating process facilitates moisture removal and epoxy infiltration into components and vacuum injection during epoxy injection. Upon completion of the injection, the epoxy was cured at the curing temperature to complete the production of the product.

In addition, as described above, the bobbin is composed of primary and secondary bobbin assemblies 40 and 50 and designed to have a structure in which the primary bobbin assembly 40 is inserted into the secondary bobbin assembly 50. The primary bobbin assembly 40 is designed in such a manner that an eye (I) type core 30 is inserted therein, and the first bobbin assembly 40 is configured on the side of the primary bobbin assembly 40 to form a secondary bobbin. When inserted into the assembly 50 is configured to be fastened to the locking structure (not shown) provided on the inner surface of the secondary bobbin assembly 50 is not separated. In addition, the outer peripheral surface of the insertion portion 62 of the connector 60 is configured to fit into the fitting groove 29a formed in the front wall 29 of the case 20, and the upper portion of the third main body 61 of the connector 60 is fitted. The second fastening part 53 of the secondary bobbin assembly 50 is fastened to the third fastening part 65 formed on the surface, and thus is configured to not be separated. In addition, by calculating the number of windings relative to the bobbin length to form a protrusion 55 on the outer surface of the secondary bobbin assembly 50 so that the coil does not overlap after winding and the winding start portion was different.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art may understand that various modifications and changes can be made without departing from the essential characteristics of the present invention. There will be. Therefore, the embodiments represented in the present invention are not intended to limit the technical spirit of the present invention, but to describe, and the scope of the present invention is not limited to these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas that are equivalent to or equivalent to the equivalent scope should be construed as being included in the scope of the present invention.

10: ignition coil 12: H / V contact
20 Case 22 Bushing
25: protrusion 26, 28: bulkhead
27: outer wall 29: front wall
30: I type core 32: permanent magnet
34: O type core 40,50: bobbin assembly
41, 51, 61: main body 43, 53, 65: fastening portion
44,54 coil 52 terminal insertion part
55: projection 60: connector
62: insertion portion 63: terminal
64: outer peripheral surface 70: PCB module
80: Boot 90: H / V Spring
S1, S2, S3: Space

Claims (8)

As an ignition coil,
Enclosure case 20 having an open top-An extension 21 is integrally formed at one side of the case 20, and a bushing 22 is inserted into the extension 21. On the lower surface of the case 20, the protrusions 25 are formed extending in a vertical downward direction by a predetermined length, and in the protrusions 25, H / V contacts for transmitting high pressure to the spark plug of the engine. (12) is provided;
An eye (I) type core 30, an o type core 34, and a permanent magnet 32 disposed to be inserted into the case 20;
The eye (I) core 30 has a first body 41 in the form of a hollow rectangular bar so that the core 30 can be inserted therein, and an extension portion 42 is formed at one end of the first body 41. The first fastening part 43 protrudes and is formed above the other end, and is formed on the outer surface of the first body 41 between the expansion part 42 and the first fastening part 43. Primary bobbin assembly 40 to which 44 is wound;
It has a hollow second body 51 so that the primary bobbin assembly 40 can be inserted therein, a terminal insertion portion 52 is formed at one end of the second body 41, and 2, the fastening part 53 is formed to protrude, and the secondary coil 54 is wound on the outer surface of the second body 51 between the second fastening part 53 and the terminal insertion part 52. Primary bobbin assembly 50;
A connector 60 and a PCB module 70 coupled to one side of the case 20;
An insertion hole 82 into which the protrusion 25 is fitted, formed at a central portion thereof, and a boot 80 coupled to a lower portion of the case 20; And
High-efficiency ignition coil for an automobile, characterized in that it comprises a H / V spring 90 is inserted into the boot 80. According to claim 1, wherein a pair of first partition 26 is formed inside the case 20, the first partition 26 is radially inwardly spaced inward from the outer wall 27 of the case 20 The primary bobbin assembly 40 and the secondary bobbin assembly 50 are disposed in the first space S1 defined by the first partition wall 26 and spaced apart from each other, and the outer wall 27 is disposed. And the O-type core 34 is disposed in the second space S2 defined by the first partition wall 26, and the primary bobbin assembly 40 is the secondary bobbin assembly 50. The coupling structure of the primary bobbin assembly 40 and the secondary bobbin assembly 50 in the state inserted into the secondary bobbin assembly 50 through the side of the inserted into the case 20 A child characterized in that it is vertically coupled to the interior of the coupling structure of the (I) type core 30 and the (O) type core 34 High efficiency ignition coil for automobiles. According to claim 2, wherein the eye (I) type core 30 of the primary bobbin assembly 40 and the secondary bobbin assembly 50 in the state inserted into the primary bobbin assembly 40 After assembly, it is inserted into the oh-type core 34 and has a predetermined gap formed between one end of the eye-type core 30 and one inner surface of the oh-type core 34. High-efficiency ignition coil for automobiles, characterized in that the permanent magnet 34 is inserted in the. 2. The third space of claim 1, wherein a second partition wall 28 is formed in front of the case 20, and is defined by the second partition wall 28 and the front wall 29 of the case 20. The PCB module 70 is disposed at S3, and a fitting groove 29a is formed at the front wall 29 so that the connector 60 may be mounted by fitting. The outer wall 27 is a high efficiency ignition coil for automobiles, characterized in that formed to have a constant thickness. 5. The connector 60 of claim 4, wherein the connector 60 includes a third main body 61 having a hollow rectangular parallelepiped and an insertion part 62 extending obliquely downward from one end of the third main body 61. The third fastening part 65 protrudes from the upper surface of the third main body 61, the second fastening part 53 is fastened to the third fastening part 65, and the connector 60. ) Is a high efficiency ignition coil for automobiles, characterized in that it comprises a plurality of terminals (63) exposed from the inside of the main body (61) to the outside via the insertion portion (62). The terminal 63 of claim 5, wherein the terminals 63 are formed of four pin-type terminals, and when the connector 60 is coupled to the case 20, the terminals 63 are connected to the terminal inserting portion. 52) is fastened by inserting, the outer circumferential surface (64) of the insertion portion (62) is a high efficiency ignition coil for automobiles, characterized in that formed thin so as to fit into the fitting groove (29a). The winding area of claim 1, wherein a plurality of protrusions 55 protrude from the outer surface of the second body 51, and the outer surface of the second body 51 is divided by the protrusions 55. High efficiency ignition coil for automobiles, characterized in that the secondary coil (54) is wound in each winding area. 8. The high-efficiency ignition coil for automobiles according to claim 7, wherein the allowable area provided by the winding areas has a margin of 22% relative to the total number of turns of the coil.

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