Multi-coil ignition coil

Abstract

The utility model discloses a multi-coil ignition coil which comprises a shell, the shell extends along one direction to form coils for accommodating a plurality of ignition coils, a plurality of coil positions are arranged on the shell, the coil positions are arranged along the extending direction of the shell, and a coil assembly is arranged in each coil position. A high-voltage sheath is arranged below the coil position, a PCB is arranged above the coil position, and the PCB is arranged in the extending direction of the shell and electrically connected with each coil assembly. The utility model has the following advantages and effects: the coil assembly is arranged along the length extension direction of the shell, and the PCB is arranged above the coil assembly, so that the design space is increased, the shell can accommodate the coil assembly which is large enough, especially the size of an iron core, the magnetic field intensity of the coil assembly is enhanced, and the electromagnetic conversion efficiency of energy is improved; therefore, the cost for achieving other aspects of the same standard is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of ignition coils, in particular to a multi-wire package ignition coil. Background Art

[0002] A multi-wire ignition coil, also known as a one-piece ignition coil, is an ignition coil made by connecting multiple ignition coils together. Compared with a single ignition coil, it has the advantage of low price. Since most vehicles have four-cylinder engines, a multi-wire ignition coil is generally made of four ignition coils connected together.

[0003] The Chinese patent with the authorization announcement number CN 106158324 B discloses a one-piece ignition coil, which uses one or two large coil assemblies, and the lead-out end is separated from the large coil assembly to the high-voltage head. In this way, the high voltage value output will have deviations. With the upgrade of the on-board computer system, the on-board computer system achieves precise control to save fuel. The different amounts of electric sparks produced by different cylinders in the engine cylinder due to the high voltage value deviation is a problem that cannot be ignored. After research and experiments by engineers, it was found that using one high-voltage output and one coil assembly can solve this problem. Therefore, multi-wire ignition coils mostly use a design of one high-voltage output and one coil assembly, such as the Chinese patent with the authorization announcement number CN 213815796 U.

[0004] According to the Chinese patent with the authorization announcement number CN 213815796 U, the assembly direction of the coil assembly is perpendicular to the length direction of the ignition coil housing, and the PCB board is arranged on one side of the coil assembly. This arrangement cannot increase the length and size of the iron core, increase the electromagnetic conversion efficiency, and is costly and complex to produce. The magnetic field strength of the known transformer is proportional to the size and length of the iron core. A new one-piece ignition coil structure can be set to enhance the magnetic field strength of the coil assembly and save production costs. Utility Model Content

[0005] The utility model aims to provide a multi-wire ignition coil, wherein the coil assembly is arranged along the length direction of the ignition coil housing, the PCB board is arranged above the coil assembly, and the housing of the ignition coil has enough space to set the size of the iron core, thereby enhancing the magnetic field strength of the coil assembly and improving the electromagnetic conversion efficiency of energy.

[0006] The above technical purpose of the utility model is achieved through the following technical solutions: a multi-wire package ignition coil, including a shell, the shell is extended in one direction to form and accommodate multiple wire packages of ignition coils, the shell is provided with multiple coil positions, the coil positions are arranged along the extension direction of the shell, each of the coil positions is provided with a coil assembly, a high-voltage sheath is arranged below the coil position, a PCB board is arranged above the coil position, the PCB board is arranged along the extension direction of the shell and is electrically connected to each coil assembly.

[0007] By adopting the above technical solution, the coil assembly is arranged along the extending direction of the shell length, and the PCB board is arranged above the coil assembly, so that the ignition coil has sufficient space to set the size of the coil assembly, especially the size of the iron core.

[0008] A further setting of the present utility model is that: the coil position includes a receiving cavity and a blocking surface, the receiving cavity is provided to receive the coil assembly, the blocking surface is arranged on both sides of the receiving cavity along the extending direction of the shell, and the blocking surface limits and fixes the iron core.

[0009] A further setting of the present utility model is that: the blocking surface includes a first contact surface, a second contact surface and a third contact surface, and clamping grooves are respectively arranged on the first contact surface and the third contact surface.

[0010] A further setting of the present utility model is that: the coil assembly includes an iron core and a primary skeleton and a secondary skeleton arranged on the iron core. A primary coil is wound on the primary skeleton, a secondary coil is wound on the secondary skeleton, the iron core is penetrated and arranged in the cavity of the primary skeleton, and the secondary skeleton is arranged outside the primary skeleton.

[0011] A further setting of the present utility model is that: the iron core is provided with a plurality of limiting ribs, and the limiting ribs limit and fix the primary skeleton and the secondary skeleton.

[0012] A further setting of the present utility model is that: a conical surface is arranged at the end of the iron core, and the conical surface is fitted with the blocking surface.

[0013] A further setting of the present utility model is that: a clamping block protrudes outward from the conical surface, and the clamping block is in clamping fit with the clamping groove.

[0014] A further setting of the present utility model is that: the PCB board is connected with a low-voltage head, and the low-voltage head is provided with a grounding end, a positive voltage end and a negative control end.

[0015] A further setting of the present utility model is that: wiring points GND, B+, HV, C-1 are arranged on the PCB board. One end of the primary coil is electrically connected to the HV end through a positive high-voltage insert piece, the other end of the primary coil is electrically connected to the C-1 end, one end of the secondary coil is electrically connected to a suppression resistor in the high-voltage sheath through a negative high-voltage insert piece and a negative high-voltage pin, and the other end of the secondary coil is electrically connected to the grounding end GND through a grounding insert piece.

[0016] A further setting of the present utility model is that: a separating part is arranged between each coil position, and the separating part separates the coil assemblies.

[0017] Compared with the prior art, the utility model has the following advantages: 1. The coil assembly is arranged along the extension direction of the length of the housing, and the PCB board is arranged above the coil assembly, which increases the design space so that the housing can accommodate a sufficiently large coil assembly, especially the size of the iron core, enhances the magnetic field strength of the coil assembly, improves the electromagnetic conversion efficiency of energy, and thus saves the costs in other aspects to achieve the same standard; 2. The blocking surface defines the iron core so that the iron core will not become loose and damage the ignition coil due to long-term operation; 3. The limiting ribs fix the coil assembly and will not damage the ignition coil due to the long-term operation of the coil assembly; 4. The arrangement of the PCB board simplifies the PCB connection points and the PCB board, saving costs. Description of the Drawings

[0018] Figure 1 is an overall structural view of the multi-wire-wrapped ignition coil in the embodiment.

[0019] Figure 2 is a cross-sectional view of the multi-wire-wrapped ignition coil in the embodiment.

[0020] Figure 3 is in the embodiment Figure 2 partial enlarged view of A.

[0021] Figure 4 is a top view of the housing of the multi-wire-wrapped ignition coil in the embodiment.

[0022] Figure 5 is in the embodiment Figure 4 partial enlarged view of B.

[0023] Figure 6 is a view of the iron core assembled on the housing of the multi-wire-wrapped ignition coil in the embodiment.

[0024] Figure 7 is in the embodiment Figure 6 partial enlarged view of C.

[0025] Figure 8 is an assembly view of the housing with the PCB board installed on the multi-wire-wrapped ignition coil in the embodiment.

[0026] Figure 9 is in the embodiment Figure 8 partial enlarged view of D.

[0027] In the figure: 100, outer shell; 101, coil position; 102, receiving cavity; 103, blocking surface; 104, first contact surface; 105, second contact surface; 106, third contact surface; 107, card slot; 108, partition part; 200, coil assembly; 201, iron core; 202, primary skeleton; 203, secondary skeleton; 204, limiting rib; 205, conical surface; 206, clamping block; 207, positive high-voltage insert; 208, ground insert; 209, negative high-voltage insert; 210, negative high-voltage pin; 300, PCB board; 301, low-voltage head; 400, high-voltage sheath. Detailed implementation mode

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] As Figure 1 and 5 shown, this embodiment is a multi-wire package ignition coil composed of four groups of ignition coils. The outer shell 100 of the multi-wire package ignition coil extends and forms into a long strip shape in one direction. Four groups of wire packages are arranged in the outer shell 100 to form four groups of ignition coils; the bottom of the outer shell 100 protrudes outward to connect with the high-voltage sheath 400. Four coil positions 101 are arranged along the length direction of the outer shell 100. A coil assembly 200 is arranged on each coil position 101. A strip-shaped PCB board 300 is arranged above the outer shell 100, and the PCB board 300 is electrically connected to each coil assembly 200 respectively.

[0030] As Figure 3 shown, the coil position 101 includes a receiving cavity 102 and a blocking surface 103. The receiving cavity 102 is arranged to receive the coil assembly 200. The bottom of the receiving cavity 102 is communicated with the inner cavity of the high-voltage sheath 400. The blocking surfaces 103 are symmetrically arranged on both sides above the receiving cavity 102 along the length direction of the outer shell 100. The blocking surfaces 103 limit and fix the two ends of the iron core 201, and at the same time cooperate with the receiving cavity 102 to arrange the coil assembly 200 in the outer shell 100.

[0031] In this embodiment, the blocking surface 103 includes a first contact surface 104, a second contact surface 105 and a third contact surface 106, and card slots 107 are respectively arranged on the first contact surface 104 and the third contact surface 106.

[0032] As Figure 2As shown, the coil assembly 200 includes an iron core 201 and a primary frame 202 and a secondary frame 203 arranged on the iron core 201. The primary frame 202 is wound with a primary coil, and the secondary frame 203 is wound with a secondary coil. The iron core 201 is arranged in the cavity of the primary frame 202, and the secondary frame 203 is arranged outside the primary frame 202. The coil assembly 200 is arranged in the accommodating cavity 102, the primary coil on the primary frame 202 is electrically connected to the PCB board 300 through the positive high-voltage plug 207, the secondary coil on the secondary frame 203 is electrically connected to the PCB board 300 through the grounding plug 208, and the secondary frame 203 is provided with a negative high-voltage plug 209, and the negative high-voltage plug 209 is electrically connected to the suppression resistor in the high-voltage sheath 400 through the negative high-voltage plug pin 210.

[0033] In this embodiment, a suppression resistor (not shown in the drawings) and a high-voltage spring (not shown in the drawings) are provided in the high-voltage sheath 400 . The suppression resistor is electrically connected to the high-voltage spring, and the high-voltage sheath 400 is connected to a spark plug (not shown in the drawings).

[0034] like Figure 4 As shown, when the coil assembly 200 is installed in the accommodating cavity 102 of the coil position 101, the iron core 201 is mounted on the blocking surface 103, and two limiting ribs 204 are symmetrically arranged at both ends of the iron core 201. The limiting ribs 204 limit and fix the primary skeleton 202 and the secondary skeleton 203, so as to avoid the position deviation caused by vibration when the coil assembly 200 is working; after the coil assembly 200 is installed in the accommodating cavity 102, it is necessary to fill the accommodating cavity 102 with glue to seal it. The position deviation of the coil assembly 200 will cause the injected glue to expand and crack the outer shell 100. At the same time, in order to prevent the injected glue from expanding and cracking the outer shell 100 due to heat, anti-cracking ribs are arranged on the outer shell 100.

[0035] like Figure 4 As shown, the end of the iron core 201 is set to a conical surface 205, and the conical surface 205 is embedded in the blocking surface 103 for installation. The conical surface 205 protrudes outward with a block 206, and the block 206 is engaged with the slot 107 to ensure that the iron core 201 will not loosen or shift during long-term operation; at the same time, the length of the iron core 201 is greater than the length of the primary skeleton 202 or the secondary skeleton 203. The increase in the length of the iron core 201 can enhance the magnetic field density, improve the electromagnetic induction intensity, and improve the electromagnetic conversion efficiency. At the same time, the conical surface 205 at the end of the iron core 201 makes the magnetic field more separate and denser, thereby improving the electromagnetic conversion efficiency.

[0036] In this embodiment, a partition 108 is provided between each of the coil positions 101 . The partition 108 separates the coil assemblies 200 to prevent the magnetic field of the ignition coil from interfering with adjacent coil assemblies 200 when the ignition coil is working.

[0037] like Figure 5 , 6As shown, in this embodiment, the PCB board 300 is connected to the low-voltage head 301. The low-voltage head 301 has six terminals, namely GND, B+, C-1, C-2, C-3, and C-4. GND is the ground terminal, B+ is the positive voltage terminal, and C-1, C-2, C-3, and C-4 are the negative control terminals. At the same time, the C-1, C-2, C-3, and C-4 terminals are respectively connected to the in-vehicle system control terminals to control the ignition of each ignition coil. As Figure 6 shown, the PCB board 300 has four connection points corresponding to each ignition coil. For example, the ignition coil A has connection points GND, B+, HV, and C-1. One end of the primary coil on the primary skeleton 202 is electrically connected to the HV terminal through the positive high-voltage insert 207, and the other end of the secondary coil is electrically connected to the C-1 terminal. One end of the secondary coil on the secondary skeleton 203 is electrically connected to the suppression resistor in the high-voltage sheath 400 through the negative high-voltage insert 209 and the negative high-voltage pin 210, and the other end of the secondary coil is electrically connected to the ground terminal GND through the ground insert 208.

[0038] During ignition, the primary coil outputs a pulsed voltage, and the secondary coil self-induces a high-voltage pulsed voltage of several thousand volts. The high-voltage pulsed voltage is transmitted to the spark plug through the high-voltage sheath 400 to cause the spark plug to ignite.

[0039] The above description is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features, and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A multi-coil ignition coil, comprising a housing (100), wherein the housing (100) is formed by extending in one direction and accommodating a plurality of coils of the ignition coil, characterized in that: A plurality of coil positions (101) are provided on the housing (100), the coil positions (101) are arranged along the extension direction of the housing (100), a coil assembly (200) is provided in each of the coil positions (101), a high-voltage sheath (400) is provided below the coil position (101), a PCB board (300) is provided above the coil position (101), the PCB board (300) is arranged along the extension direction of the housing (100) and is electrically connected to each coil assembly (200).

2. The multi-wire ignition coil according to claim 1, characterized in that: The coil position (101) comprises a housing cavity (102) and a blocking surface (103); the housing cavity (102) is arranged to accommodate the coil assembly (200); the blocking surface (103) is arranged on both sides of the housing cavity (102) along the extension direction of the housing (100); and the blocking surface (103) limits and fixes the iron core (201).

3. A multi-wire ignition coil according to claim 2, characterized in that: The blocking surface (103) comprises a first contact surface (104), a second contact surface (105) and a third contact surface (106), and the first contact surface (104) and the third contact surface (106) are respectively provided with a card slot (107).

4. The multi-wire ignition coil according to claim 2, characterized in that: The coil assembly (200) comprises an iron core (201) and a primary frame (202) and a secondary frame (203) arranged on the iron core (201); a primary coil is wound on the primary frame (202), and a secondary coil is wound on the secondary frame (203); the iron core (201) is arranged through a cavity of the primary frame (202), and the secondary frame (203) is arranged outside the primary frame (202).

5. The multi-wire ignition coil according to claim 4, characterized in that: The iron core (201) is provided with a plurality of limiting ribs (204), and the limiting ribs (204) limit and fix the primary frame (202) and the secondary frame (203).

6. The multi-wire ignition coil according to claim 5, characterized in that: The end of the iron core (201) is provided with a tapered surface (205), and the tapered surface (205) is engaged with the blocking surface (103).

7. The multi-wire ignition coil according to claim 6, characterized in that: A clamping block (206) protrudes outward from the conical surface (205), and the clamping block (206) is clamped and matched with the clamping groove (107).

8. The multi-wire ignition coil according to claim 1, characterized in that: The PCB board (300) is connected to a low-voltage head (301), and the low-voltage head (301) is provided with a ground terminal, a positive voltage terminal and a negative control terminal.

9. The multi-wire ignition coil according to claim 8, characterized in that: The PCB board (300) is provided with connection points GND, B+, HV, and C-1; one end of the primary coil is electrically connected to the HV end via a positive high-voltage plug-in sheet (207); the other end of the primary coil is electrically connected to the C-1 end; one end of the secondary coil is electrically connected to a suppression resistor in a high-voltage sheath (400) via a negative high-voltage plug-in sheet (209) and a negative high-voltage plug-in pin (210); and the other end of the secondary coil is electrically connected to a ground terminal GND via a ground plug-in sheet (208).

10. The multi-wire ignition coil according to claim 1, characterized in that: A partition (108) is provided between each of the coil positions (101), and the partition (108) separates the coil assembly (200).

Images