Low-induced-voltage overhead single-cylinder independent ignition coil

Abstract

A low-induced-voltage overhead single-cylinder independent ignition coil comprises a shell, the shell is provided with a lateral opening and a side cover installed on the opening, a low-voltage head is installed at the top of the shell, a high-voltage head is formed at the bottom of the shell, and the interior of the shell is divided into a first cavity located below the low-voltage head and a second cavity located above the high-voltage head. An ignition module is installed in the first cavity, a high-voltage positioning block and a coil assembly are installed in the second cavity, epoxy resin is filled in the second cavity, the high-voltage positioning block is located between the high-voltage head and the high-voltage end of the coil assembly, and the high-voltage positioning block is configured to press and fix the coil assembly in the second cavity and achieve electric connection with the high-voltage head. The diode is placed at the secondary high-voltage end in a press-insertion connection mode, the positioning piece serves as a carrier, the two ends of the diode are in press-insertion with the connecting pieces, and the two connecting pieces are matched with the secondary terminal and the output end resistor respectively, so that induced voltage generated at the secondary side during primary conduction is effectively reduced, and the tempering phenomenon in an engine cylinder is avoided.

Description

Technical Field

[0001] The invention relates to an ignition coil structure. Background Art

[0002] In the automobile engine ignition system, the ignition coil is an actuator that provides ignition energy for igniting the air and fuel mixture in the engine cylinder. It is a special pulse booster based on the principle of electromagnetic induction. It switches the low voltage of 8-16V on and off at a set frequency to generate a 20-40KV voltage on the secondary side to generate electric sparks through the spark plug. The invention patent with application number 201810931477.X discloses a top-mounted single-cylinder independent ignition coil, including a high-voltage rod, a channel inside the high-voltage rod, a high-voltage spring arranged in the channel, a high-voltage connection end at the bottom of the high-voltage rod, and an interconnection end at the top of the high-voltage rod; a shell is connected to the interconnection end, the shell has an opening facing the side, and a drawer structure is installed in the opening, the drawer mechanism includes a frame body, a coil assembly, and a low-voltage head, the coil assembly includes a T-shaped iron core formed by powder metallurgy pressing, a PI insulating layer covering the core column of the T-shaped iron core, a primary winding wound on the PI insulating layer, a secondary skeleton sleeved on the outside of the primary winding, a secondary winding wound on the secondary skeleton, and a powder metallurgy pressed mouth-shaped iron core arranged outside the T-shaped iron core, the bottom surface of the T-shaped iron core and the inner wall of the mouth-shaped iron core are adsorbed together by a rare earth magnet, and the low-voltage head has a substrate, an ignition module and a low-voltage plug connected by resistance welding are arranged on the substrate. In the ignition coil of this structure, since the high-voltage diode is arranged at the low-voltage end of the secondary coil, a large induced voltage is generated at the secondary when the primary is turned on, resulting in a backfire phenomenon in the engine cylinder. Summary of the invention

[0003] The object of the present invention is to provide a low-induction voltage top-mounted single-cylinder independent ignition coil with a relatively small secondary induction voltage.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a low-induction voltage top-mounted single-cylinder independent ignition coil, comprising a shell, the shell having a lateral opening and a side cover installed on the opening, a low-pressure head installed on the top of the shell, and a high-pressure head formed on the bottom of the shell, the interior of the shell is divided into a first cavity located below the low-pressure head and a second cavity located above the high-pressure head, an ignition module is installed in the first cavity, a high-voltage positioning block and a coil assembly are installed in the second cavity and filled with epoxy resin, the high-voltage positioning block is located between the high-voltage head and the high-voltage end of the coil assembly, and the high-voltage positioning block is configured to press and fix the coil assembly in the second cavity and electrically connect it to the high-voltage head.

[0005] Preferably, a high-voltage diode, a first connecting plate, and a second connecting plate are installed on the high-voltage positioning block, the first connecting plate is connected to one end of the high-voltage diode and has an elastic connecting portion facing sideways, and the second connecting plate is connected to the other end of the high-voltage diode and has a connecting hole facing downwards.

[0006] Preferably, a high-voltage sheath is installed on the high-voltage head, and a high-voltage spring is installed in the longitudinal direction inside the high-voltage sheath.

[0007] Preferably, a suppression resistor and a high-voltage pin are provided in the high-voltage head, the high-voltage pin is connected to the upper end of the high-voltage spring, the lower end of the suppression resistor is connected to the high-voltage pin, and the upper end of the suppression resistor is passed through the connecting hole of the second connecting plate.

[0008] Preferably, the coil assembly includes a T-shaped iron core, a primary frame sleeved on the outside of the T-shaped iron core, a secondary frame sleeved on the primary frame, a first C-shaped iron core and a second C-shaped iron core surrounded by the outside of the secondary frame, and the first C-shaped iron core and the second C-shaped iron core are relatively combined together to form an O shape and are respectively connected to the ends of the T-shaped iron core.

[0009] Preferably, a secondary winding is wound on the secondary skeleton, a negative high-voltage plug-in is provided at the high-voltage end of the secondary skeleton, a positive high-voltage plug-in is provided at the low-voltage end of the secondary skeleton, one end of the secondary winding is connected to the negative high-voltage plug-in, and the other end is connected to the positive high-voltage plug-in. When the coil assembly is loaded into the second cavity, the negative high-voltage plug-in is elastically pressed by the elastic connecting part of the first connecting piece, and the positive high-voltage plug-in is connected to the ignition module.

[0010] Preferably, the negative high-voltage plug is located on the rear side of the secondary frame, and the positive high-voltage plug is located on the front side of the secondary frame.

[0011] Preferably, a slot is provided at the end of the secondary skeleton, and the side ends of the first C-shaped iron core and the second C-shaped iron core have interconnection ends, and the interconnection ends of the first C-shaped iron core and the second C-shaped iron core are connected together in the slot.

[0012] Preferably, the top surface of the T-shaped iron core and the interconnection end are adsorbed together by a magnetic sheet.

[0013] Preferably, the first C-shaped iron core and the second C-shaped iron core are externally wrapped with a buffer cover.

[0014] Due to the adoption of the above technical scheme, the present invention places the diode at the secondary high-voltage end through a press-insert connection, the positioning sheet is used as a carrier, the two ends of the diode are press-inserted with the connecting sheet, and the two connecting sheets are respectively matched with the secondary terminal and the output end resistor, which effectively reduces the induced voltage generated in the secondary when the primary is turned on, and avoids the backfire phenomenon in the engine cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attached Figure 1 A three-dimensional diagram of a low induction voltage top-mounted single-cylinder independent ignition coil according to the present invention; Attached Figure 2 An exploded view of a low induction voltage top-mounted single-cylinder independent ignition coil according to the present invention; Attached Figure 3 A three-dimensional diagram of a high-voltage positioning block of a low-induction voltage top-mounted single-cylinder independent ignition coil according to the present invention; Attached Figure 4 The figure is a working principle diagram of a low induction voltage top-mounted single-cylinder independent ignition coil according to the present invention. DETAILED DESCRIPTION

[0016] Hereinafter, the terms used in the specification will be briefly described, and the embodiments will be described in detail. All terms including descriptive terms or technical terms used herein should be interpreted as having meanings understood by those of ordinary skill in the art. However, these terms may have different meanings according to the intentions of those of ordinary skill in the art, precedents, or the emergence of new technologies.

[0017] In addition, some terms can be selected by the applicant, and in this case, the meaning of the selected terms will be described in detail in the detailed description of the embodiment. Therefore, the terms used herein must be defined based on the meaning of the terms together with the description in the entire specification. In addition, when a component "includes" or "contains" an element, unless there is a specific description to the contrary, the component may also include other elements without excluding other elements. In the following description, terms such as "component" and "module" indicate a unit for processing at least one function or operation, wherein the unit and module can be implemented as hardware or software or by combining hardware and software and implemented.

[0018] Embodiments will now be described more fully with reference to the accompanying drawings. However, embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the embodiments to those of ordinary skill in the art. In the following description, well-known functions or structures are not described in detail because they will obscure the embodiments with unnecessary details, and throughout the specification, the same reference numerals in the drawings represent the same or similar elements.

[0019] Attached Figure 1 is a three-dimensional diagram of a low induction voltage top-mounted single-cylinder independent ignition coil according to the present invention, Figure 2 The exploded view of the low induction voltage top-mounted single-cylinder independent ignition coil according to the present invention; A low induction voltage top-mounted single-cylinder independent ignition coil comprises a housing 1, which is mounted on the engine by screws 22. The housing 1 has a lateral opening and a side cover 2 mounted on the opening, a low-pressure head 3 is mounted on the top of the housing 1, and a high-pressure head 4 is formed at the bottom of the housing 1, a high-pressure sheath 17 is mounted on the high-pressure head 4, a high-pressure spring 18 is mounted longitudinally in the high-pressure sheath 17, and a suppression resistor 19 and a high-pressure pin 20 are arranged in the high-pressure head 4, and the high-pressure pin 20 is connected to the upper end of the high-pressure spring 18. The interior of the housing 1 is divided into a first cavity 1a located below the low-pressure head 3 and a second cavity 1b located above the high-pressure head 4, an ignition module 5 is mounted in the first cavity 1a, and a high-pressure positioning block 6 and a coil assembly are mounted in the second cavity 1b and filled with epoxy resin.

[0020] The coil assembly includes a T-shaped iron core 7, a primary frame 8 sleeved on the outside of the T-shaped iron core 7, a secondary frame 9 sleeved on the primary frame 8, a first C-shaped iron core 10 and a second C-shaped iron core 11 arranged around the outside of the secondary frame 9, the first C-shaped iron core 10 and the second C-shaped iron core 11 are relatively combined together to form an O shape and are respectively connected to the ends of the T-shaped iron core 7. The first C-shaped iron core 10 and the second C-shaped iron core 11 are wrapped with a buffer cover.

[0021] A secondary winding is wound on the secondary skeleton 9, a negative high-voltage plug-in sheet 12 is provided at the high-voltage end of the secondary skeleton 9, a positive high-voltage plug-in sheet 13 is provided at the low-voltage end of the secondary skeleton 9, one end of the secondary winding is connected to the negative high-voltage plug-in sheet 12, and the other end is connected to the positive high-voltage plug-in sheet 13, the negative high-voltage plug-in sheet 12 is located at the rear side of the secondary skeleton 9, and the positive high-voltage plug-in sheet 13 is located at the front side of the secondary skeleton 9. When the coil assembly is installed in the second cavity 1b, the negative high-voltage plug-in sheet 12 is elastically pressed by the elastic connecting portion 15a of the first connecting sheet 15, and the positive high-voltage plug-in sheet 13 is connected to the ignition module 5.

[0022] The end of the secondary skeleton 9 is provided with a slot 9a, and the side ends of the first C-shaped iron core 10 and the second C-shaped iron core 11 have interconnection ends 10a, 11a, and the interconnection ends 10a, 11a of the first C-shaped iron core 10 and the second C-shaped iron core 11 are connected together in the slot 9a. The top surface of the T-shaped iron core 7 and the interconnection ends 10a, 11a are adsorbed together by a magnetic sheet 21.

[0023] Attached Figure 3The figure is a stereoscopic diagram of the high-voltage positioning block of the low-induction voltage top-mounted single-cylinder independent ignition coil according to the present invention; the high-voltage positioning block 6 is located between the high-voltage head 4 and the high-voltage end of the coil assembly, and the high-voltage positioning block 6 is configured to press and fix the coil assembly in the second cavity 1b and electrically connect it to the high-voltage head 4. The high-voltage positioning block 6 is equipped with a high-voltage diode 14, a first connecting piece 15, and a second connecting piece 16. The first connecting piece 15 is connected to one end of the high-voltage diode 14 and has an elastic connecting portion 15a facing the side, and the second connecting piece 16 is connected to the other end of the high-voltage diode 14 and has a connecting hole 16a facing downward. The lower end of the suppression resistor 19 is connected to the high-voltage pin 20, and the upper end of the suppression resistor 19 is penetrated through the connecting hole 16a of the second connecting piece 16.

[0024] Attached Figure 4 The figure is a working principle diagram of the low induction voltage top-mounted single-cylinder independent ignition coil according to the present invention. The present invention places the diode at the secondary high-voltage end through a press-insertion connection, the positioning plate is a carrier, the two ends of the diode are press-inserted with the connecting plate, and the two connecting plates are respectively matched with the secondary terminal and the output terminal resistor. It has been verified that when the high-voltage diode is placed at the low-voltage end of the secondary coil, the induced voltage generated at the secondary when the primary is turned on is about 900V, and when the high-voltage diode is placed at the high-voltage end of the secondary coil, the induced voltage generated at the secondary when the primary is turned on is less than 200V, which effectively reduces the induced voltage generated at the secondary when the primary is turned on, and avoids the backfire phenomenon in the engine cylinder.

[0025] It should be understood that the embodiments described herein should be considered in a descriptive sense only and not for the purpose of limitation. The description of the features or aspects within each implementation side should generally be considered to be applicable to other similar features or aspects in other embodiments. Although one or more embodiments have been described with reference to the accompanying drawings, it will be understood by those of ordinary skill in the art that various changes in form and detail may be made therein without departing from the spirit and scope defined by the appended claims.

Claims

1. A low induction voltage top-mounted single-cylinder independent ignition coil, characterized in that: The invention comprises a shell (1), wherein the shell (1) has a lateral opening and a side cover (2) mounted on the opening, a low-pressure head (3) is mounted on the top of the shell (1), and a high-pressure head (4) is formed on the bottom of the shell (1), and the interior of the shell (1) is divided into a first cavity (1a) located below the low-pressure head (3) and a second cavity (1b) located above the high-pressure head (4), an ignition module (5) is mounted in the first cavity (1a), and a high-pressure positioning block (6) and a coil assembly are mounted in the second cavity (1b) and filled with epoxy resin, wherein the high-pressure positioning block (6) is located between the high-pressure head (4) and the high-voltage end of the coil assembly, and the high-pressure positioning block (6) is configured to press and fix the coil assembly in the second cavity (1b) and to electrically connect the coil assembly to the high-pressure head (4).

2. The low induction voltage top-mounted single-cylinder independent ignition coil according to claim 1 is characterized in that: The high-voltage positioning block (6) is mounted with a high-voltage diode (14), a first connecting piece (15), and a second connecting piece (16); the first connecting piece (15) is connected to one end of the high-voltage diode (14) and has an elastic connecting portion (15a) facing sideways; the second connecting piece (16) is connected to the other end of the high-voltage diode (14) and has a connecting hole (16a) facing downwards.

3. The low induction voltage top-mounted single-cylinder independent ignition coil according to claim 2 is characterized in that: A high-voltage sheath (17) is installed on the high-voltage head (4), and a high-voltage spring (18) is installed longitudinally inside the high-voltage sheath (17).

4. The low induction voltage top-mounted single-cylinder independent ignition coil according to claim 3 is characterized in that: The high-voltage head (4) is provided with a suppression resistor (19) and a high-voltage pin (20); the high-voltage pin (20) is connected to the upper end of the high-voltage spring (18); the lower end of the suppression resistor (19) is connected to a spring mounted on the high-voltage pin (20); and the upper end of the suppression resistor (19) is passed through a connection hole (16a) of the second connection sheet (16).

5. The low induction voltage top-mounted single-cylinder independent ignition coil according to claim 2 is characterized in that: The coil assembly comprises a T-shaped iron core (7), a primary frame (8) sleeved on the outside of the T-shaped iron core (7), a secondary frame (9) sleeved on the primary frame (8), a first C-shaped iron core (10) and a second C-shaped iron core (11) arranged around the outside of the secondary frame (9), wherein the first C-shaped iron core (10) and the second C-shaped iron core (11) are relatively combined together to form an O shape and are respectively connected to the ends of the T-shaped iron core (7).

6. The low induction voltage top-mounted single-cylinder independent ignition coil according to claim 5 is characterized in that: A secondary winding is wound on the secondary frame (9); a negative high-voltage plug-in sheet (12) is provided at the high-voltage end of the secondary frame (9); a positive high-voltage plug-in sheet (13) is provided at the low-voltage end of the secondary frame (9); one end of the secondary winding is connected to the negative high-voltage plug-in sheet (12) and the other end is connected to the positive high-voltage plug-in sheet (13); when the coil assembly is installed in the second cavity (1b), the negative high-voltage plug-in sheet (12) is elastically compressed by the elastic connecting portion (15a) of the first connecting sheet (15), and the positive high-voltage plug-in sheet (13) is connected to the ignition module (5).

7. The low induction voltage top-mounted single-cylinder independent ignition coil according to claim 6 is characterized in that: The negative high-voltage plug-in sheet (12) is located on the rear side of the secondary frame (9), and the positive high-voltage plug-in sheet (13) is located on the front side of the secondary frame (9).

8. The low induction voltage top-mounted single-cylinder independent ignition coil according to claim 5, characterized in that: The end of the secondary skeleton (9) is provided with a slot (9a), and the side ends of the first C-type iron core (10) and the second C-type iron core (11) have interconnection ends (10a, 11a), and the interconnection ends (10a, 11a) of the first C-type iron core (10) and the second C-type iron core (11) are connected together in the slot (9a).

9. The low induction voltage top-mounted single-cylinder independent ignition coil according to claim 8, characterized in that: The top surface of the T-shaped iron core (7) and the interconnection ends (10a, 11a) are adsorbed together via a magnetic sheet (21).

10. The low induction voltage top-mounted single-cylinder independent ignition coil according to claim 5, characterized in that: The first C-shaped iron core (10) and the second C-shaped iron core (11) are externally wrapped with a buffer cover.

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