Groove winding type pen-shaped ignition coil

Abstract

A groove winding type pen-shaped ignition coil comprises a pen-shaped shell, a low-voltage head is arranged on the upper portion of the pen-shaped shell, a high-voltage sheath is arranged on the lower portion of the pen-shaped shell, and a coil assembly is arranged in the shell. The coil assembly sequentially comprises an iron core, a PI insulating sleeve wrapping the iron core, a secondary framework arranged outside the PI insulating sleeve, a primary framework arranged outside the secondary framework and an insulating rubber tape wrapping the primary framework from inside to outside, a secondary winding is wound on the secondary framework, a primary winding is wound on the primary framework, and the primary winding is wound on the primary winding. A plurality of wire grooves are formed in the secondary framework at intervals, the secondary winding wires are flatly stacked in the wire grooves in a reciprocating winding mode, and the intervals of the wire grooves are decreased along with increase of the voltage of the output end. Due to the fact that the wire ducts of the secondary framework are designed at unequal intervals, the energy density is reduced by reducing the wire duct intervals at the high-voltage end, the cracking risk of filling materials (epoxy resin) is greatly reduced, and the stability of the ignition coil is improved.

Description

Technical Field

[0001] This utility model relates to an ignition coil structure. Background Technology

[0002] In an automotive engine ignition system, the ignition coil is an actuator that provides ignition energy to ignite the air-fuel mixture in the engine cylinder. It is a special pulse booster based on the principle of electromagnetic induction, which switches a low voltage of 8-16V on and off at a set frequency to generate a 20-40KV voltage on its secondary side, which then generates an electric spark through the spark plug. Utility model patent CN204130329U discloses a slotted ignition coil, including a slotted coil frame 2 and enameled wire. The coil frame consists of a left coil baffle 203, a winding groove, and a right coil baffle 201. The winding groove is positioned between the left and right coil baffles 203 and 201, and is composed of multiple adjacent partition walls 202. Each partition wall has a through slot 204. The enameled wire is wound inside the winding groove. The left and right coil baffles 203 and 201 each have integrally manufactured winding posts. 205. During winding, the enameled wire first enters from the left coil baffle 203 and begins winding in the winding slot. When the specified number of turns is reached, it passes through the wire passage opening 204 and winds into another winding slot until it reaches the right coil baffle 201. The coil lead wire to be welded is wound onto the winding post 205 for welding as needed. The winding post 205 makes welding very convenient. In use, the slot-wound ignition coil is fixedly installed inside the ignition coil housing 1 and fixed to the chassis, forming a complete magneto stator assembly for the mist sprayer. Although the ignition coil component uses a slot-wound coil frame, it cannot solve the problems of resin cracking and inter-turn breakdown caused by high energy density and large pressure difference. Summary of the Invention

[0003] The purpose of this invention is to provide a slotted pen-type ignition coil that can effectively prevent inter-turn breakdown.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a slotted pen-shaped ignition coil, comprising a pen-shaped housing, a low-voltage head disposed on the upper part of the pen-shaped housing, a high-voltage sheath disposed on the lower part of the pen-shaped housing, and a coil assembly disposed inside the housing. The coil assembly, from the inside out, comprises an iron core, a PI insulating sleeve wrapped around the iron core, a secondary frame disposed around the PI insulating sleeve, a primary frame disposed around the secondary frame, and insulating tape wrapped around the primary frame. Secondary windings are wound on the secondary frame, and primary windings are wound on the primary frame. The secondary frame has a plurality of slots spaced apart, and the secondary windings are reciprocated and flatly stacked in the slots. The spacing of the slots decreases as the output voltage increases.

[0005] As a further improvement, the spacing between the grooves in the lower region of the secondary skeleton is larger, while the spacing between the grooves in the upper region of the secondary skeleton is smaller.

[0006] As a further improvement, the ratio of the number of grooves in the lower region of the secondary skeleton to the number of grooves in the upper region is 1:3.

[0007] As a further improvement, the effective number of winding slots in the secondary skeleton is 18.

[0008] As a further improvement, the inner wall of the pen-shaped housing is provided with an inner magnetic sleeve and an outer magnetic sleeve. The inner magnetic sleeve and the outer magnetic sleeve have a C-shaped elastic cylindrical structure. The inner magnetic sleeve and the outer magnetic sleeve are nested together and elastically tensioned on the inner wall of the pen-shaped housing.

[0009] As a further improvement, a high-voltage diode is provided at the top of the secondary frame, and one end of the secondary winding is connected to the high-voltage diode.

[0010] As a further improvement, a high-voltage spring is provided inside the high-voltage sheath, and a negative high-voltage pin is provided at the bottom end of the secondary frame, the negative high-voltage pin being connected to the high-voltage spring.

[0011] As a further improvement, a magnetic sheet is attached to the top of the iron core.

[0012] As a further improvement, a cushioning pad is attached to the magnetic sheet and the bottom of the iron core.

[0013] As a further improvement, a cylinder head sealing ring is fitted onto the outside of the pen-shaped housing.

[0014] Because the secondary skeleton of this invention adopts a non-equal spacing design for the wire grooves, the energy density is reduced by decreasing the wire groove spacing at the high voltage end, the risk of cracking of the filling material (epoxy resin) is greatly reduced, and the stability of the ignition coil is improved. Attached Figure Description

[0015] Appendix Figure 1 An exploded view of the slotted pen-shaped ignition coil according to this utility model;

[0016] Appendix Figure 2 This is a schematic diagram of the secondary coil of the slot-wound pen-type ignition coil according to the present invention. Detailed Implementation

[0017] In the following description, the terminology used in the specification will be briefly described, and embodiments will be described in detail. All terms used herein, including descriptive or technical terms, should be interpreted as having the meaning understood by one of ordinary skill in the art. However, these terms may have different meanings depending on the intent of one of ordinary skill in the art, precedent, or the emergence of new technologies.

[0018] Furthermore, some terms may be chosen by the applicant, and in such cases, the meaning of the chosen terms will be described in detail in the detailed description of the embodiments. Therefore, the terms used herein must be defined based on their meanings in conjunction with the description throughout the specification. Additionally, when a component “comprises” or “contains” an element, the component may also include other elements without excluding them, unless there is a specific description to the contrary. In the following description, terms such as “component” and “module” indicate a unit for performing at least one function or operation, wherein units and modules may be implemented as hardware or software or by combining hardware and software.

[0019] 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 limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the embodiments to those skilled in the art. In the following description, well-known functions or structures are not described in detail, as they would obscure the embodiments with unnecessary detail, and throughout the specification, the same reference numerals in the drawings denote the same or similar elements.

[0020] Appendix Figure 1This is an exploded view of the slotted pen-type ignition coil according to the present invention. A slotted pen-type ignition coil includes a pen-shaped housing 1, a low-voltage head 2 disposed on the upper part of the pen-shaped housing 1, a high-voltage sheath 3 disposed on the lower part of the pen-shaped housing 1, and a coil assembly disposed inside the housing 1. The coil assembly, from the inside out, includes an iron core 4, a PI insulating sleeve 5 wrapped around the iron core 4, a secondary frame 6 disposed outside the PI insulating sleeve 5, a primary frame 7 disposed outside the secondary frame 6, and insulating tape 8 wrapped around the primary frame 7. Secondary windings are wound on the secondary frame 6, and primary windings are wound on the primary frame 7.

[0021] A high-voltage diode 11 is disposed at the top of the secondary frame 6, and one end of the secondary winding is connected to the high-voltage diode 11. A high-voltage spring 12 is disposed inside the high-voltage sheath 3, and a negative high-voltage pin 13 is disposed at the bottom of the secondary frame 6, which is connected to the high-voltage spring 12.

[0022] A magnetic sheet 13 is attached to the top of the iron core 4, and a buffer pad 14 is attached to the magnetic sheet 13 and the bottom of the iron core 4. A cylinder head sealing ring 15 is fitted onto the outside of the pen-shaped housing 1.

[0023] The inner wall of the pen-shaped housing 1 is provided with an inner magnetic sleeve 9 and an outer magnetic sleeve 10. The inner magnetic sleeve 9 and the outer magnetic sleeve 10 have a C-shaped elastic cylindrical structure. The inner magnetic sleeve 9 and the outer magnetic sleeve 10 are nested together and elastically tensioned on the inner wall of the pen-shaped housing 1. The thickness of the magnetic sleeve is about 0.5mm, the end is burr-free, the surface is smooth, the product must not be twisted or deformed, and the corrosion resistance requirement is no red rust spots after 72 hours of salt spray test.

[0024] Appendix Figure 2 This is a schematic diagram of the secondary coil of the slotted pen-type ignition coil according to the present invention. The secondary frame 6 has a plurality of slots 61 spaced apart. The secondary winding adopts a reciprocating winding method with flat overlapping wires within the slots 61, which improves the winding speed of the coil. The slotted coil frame also provides better insulation.

[0025] The spacing of the slots 61 decreases as the output voltage increases. The spacing of the slots 61 in the lower region of the secondary frame 6 is larger, while the spacing of the slots 61 in the upper region of the secondary frame 6 is smaller. The ratio of the number of slots 61 in the lower region to the number of slots 61 in the upper region of the secondary frame 6 is 1:3. In this embodiment, the effective number of winding slots in the secondary frame 6 is 18. Because the slots of the secondary frame adopt a non-equal spacing design, the energy density is reduced by decreasing the slot spacing at the high-voltage end, which greatly reduces the risk of cracking of the filling material (epoxy resin) and improves the stability of the ignition coil.

[0026] It should be understood that the embodiments described herein should be considered in a descriptive sense only and not for limiting purposes. The description of features or aspects within each embodiment should generally be considered applicable to other similar features or aspects in other embodiments. Although one or more embodiments have been described with reference to the accompanying drawings, those skilled in the art will understand 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 slot-wound pen-type ignition coil characterized by: The device includes a pen-shaped housing (1), a low-voltage head (2) is provided on the upper part of the pen-shaped housing (1), a high-voltage sheath (3) is provided on the lower part of the pen-shaped housing (1), and a coil assembly is provided inside the housing (1). The coil assembly includes, from the inside to the outside, an iron core (4), a PI insulating sleeve (5) wrapped around the iron core (4), a secondary frame (6) provided around the PI insulating sleeve (5), a primary frame (7) provided around the secondary frame (6), and an insulating tape (8) wrapped around the primary frame (7). Secondary windings are wound on the secondary frame (6), and primary windings are wound on the primary frame (7). The secondary frame (6) is provided with a plurality of slots (61) at intervals. The secondary windings are reciprocated and flatly stacked in the slots (61). The interval of the slots (61) decreases as the output voltage increases.

2. The slot-wound pen-type ignition coil according to claim 1, characterized by: The spacing of the grooves (61) in the lower region of the secondary skeleton (6) is large, while the spacing of the grooves (61) in the upper region of the secondary skeleton (6) is small.

3. The slot-wound pen-type ignition coil of claim 2, wherein: The ratio of the number of grooves (61) in the lower region of the secondary skeleton (6) to the number of grooves (61) in the upper region is 1:

3.

4. The slot-wound pen-type ignition coil of claim 1, wherein: The secondary skeleton (6) has an effective number of 18 winding slots.

5. The slot-wound pen-type ignition coil of claim 1, wherein: The inner wall of the pen-shaped housing (1) is provided with an inner magnetic sleeve (9) and an outer magnetic sleeve (10). The inner magnetic sleeve (9) and the outer magnetic sleeve (10) have a C-shaped elastic cylindrical structure. The inner magnetic sleeve (9) and the outer magnetic sleeve (10) are nested together and elastically tensioned on the inner wall of the pen-shaped housing (1).

6. The slot-wound pen-type ignition coil of claim 1, wherein: A high-voltage diode (11) is provided at the top of the secondary frame (6), and one end of the secondary winding is connected to the high-voltage diode (11).

7. The slot-wound pen-type ignition coil of claim 1, wherein: The high-voltage sheath (3) is provided with a high-voltage spring (12), and the bottom end of the secondary frame (6) is provided with a negative high-voltage pin (13), which is connected to the high-voltage spring (12).

8. The slot-wound pen-type ignition coil of claim 1, wherein: The top of the iron core (4) is attached with a magnetic sheet (13).

9. The slot-wound pen-type ignition coil of claim 8, wherein: A buffer pad (14) is attached to the magnetic sheet (13) and the bottom of the iron core (4).

10. The slot-wound pen-type ignition coil of claim 1, wherein: The pen-shaped housing (1) is fitted with a cylinder head sealing ring (15).

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