A high-voltage terminal structure of an ignition coil and an ignition coil

Abstract

This utility model discloses a high-voltage end structure of an ignition coil and an ignition coil itself. The high-voltage end structure connects the secondary coil output terminal of the ignition coil to the spark plug and includes a suppression resistor laterally positioned at the top of the high-voltage sheath; a connecting spring, which is an irregularly shaped spring consisting of a spring head, a spring middle, and a spring bottom, disposed along the length of the cavity of the high-voltage sheath. The spring head is connected to a negative high-voltage cap, and the spring bottom is connected to the spark plug. The spring middle includes an elastic part and a rigid part; the elastic part provides elastic force to the connecting spring, and the rigid part provides force transmission and buffering; and a negative high-voltage cap is fastened to the bottom of the secondary frame and connected to the suppression resistor. This utility model improves the high-voltage end structure of the ignition coil, simplifying the ignition coil assembly structure and making it suitable for engine operating conditions.

Description

Technical Field

[0001] This utility model relates to the field of ignition coil technology, and in particular to a high-voltage end structure of an ignition coil and an ignition coil. Background Technology

[0002] The ignition coil is installed in the engine compartment and converts the low-voltage electricity in the vehicle into high-voltage electricity to power the spark plugs, which then ignite the fuel. To suppress the high-frequency electromagnetic waves generated by the ignition coil and reduce electromagnetic interference, a suppression resistor is usually installed in the high-voltage output section to reduce electromagnetic interference.

[0003] The ignition coil provides high-voltage pulse current to power the spark plug. Generally, the design must ensure that the high-voltage output connection is unobstructed. A high-voltage plug and a high-voltage pin are set at the suppression resistor. A Chinese patent with publication number CN106158327B discloses a pen-type ignition coil. The paper discloses that a negative high-voltage cap is placed at the bottom of the secondary frame to replace the high-voltage plug and the high-voltage pin to connect the high-voltage output terminal of the secondary coil.

[0004] However, after replacing the high-pressure insert and high-pressure pin with a negative high-pressure cap, the spring of normal shape will cause poor connection of the high-pressure passage under engine operating conditions, resulting in ignition failure. Utility Model Content

[0005] The purpose of this invention is to provide a high-voltage end structure for an ignition coil and an ignition coil in general. The high-voltage end structure is improved and includes a suppression resistor, a connecting spring, and a negative high-voltage cap. This high-voltage end structure is simple, easy to install quickly, and can ensure that the ignition coil can operate normally under engine conditions.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a high-voltage end structure for an ignition coil, the high-voltage end structure being used to connect the secondary coil output end of the ignition coil and the spark plug, including a suppression resistor, the suppression resistor being laterally disposed at the top of the high-voltage sheath tube;

[0007] A connecting spring is a non-circular spring consisting of a spring head, a spring middle, and a spring bottom, which is disposed in the cavity of the high-pressure sheath tube along the length direction. The spring head is connected to the negative high-pressure cap, and the spring bottom is connected to the spark plug. The spring middle includes an elastic part and a rigid part. The elastic part provides elastic force for the connecting spring, and the rigid part provides force transmission and buffering for the connecting spring.

[0008] A negative high voltage cap is fastened to the bottom of the secondary frame and connected to the suppression resistor.

[0009] A further feature of this invention is that the spring head is formed by spirally winding an elastic conductive wire into a flared opening with opposite sides, and the upper flared opening abuts against the negative high voltage cap.

[0010] A further feature of this invention is that the elastic part is connected to the spring head and the spring bottom respectively, and the elastic part is made of high-toughness conductive spring steel spirally wound.

[0011] A further feature of this invention is that the helical gap of the rigid part is in a tight state, the pitch of the elastic conductive wire spiral of the rigid part is zero, and the elastic conductive wires spirally abut against each other.

[0012] A further feature of this invention is that the bottom of the spring is conical.

[0013] A further feature of this invention is that the negative high-pressure cap includes an outwardly protruding cap head, an arc-shaped cap brim, and an annular connecting edge extending integrally from the cap brim. The annular connecting edge engages with the bottom of the secondary frame, and the cap head abuts against the spring head.

[0014] A further feature of this invention is that the elastic part is made of high-toughness spring steel spirally wound, the rigid part is made of spring steel with low elastic limit spirally wound, and the elastic part is welded to the rigid part.

[0015] An ignition coil includes a housing and a high-voltage sheath tube, wherein the high-voltage sheath tube is provided with the high-voltage terminal structure of the ignition coil described above.

[0016] A further feature of this invention is that a secondary frame is inserted inside the housing, an iron core is disposed inside the secondary frame, an insulating sleeve is disposed around the iron core, a primary coil is wound on the insulating sleeve, a secondary coil is wound around the secondary frame, an inner magnetic sleeve is disposed outside the housing, and an outer magnetic sleeve is disposed outside the inner magnetic sleeve.

[0017] A further feature of this invention is that: a primary winding cap is provided at the top of the secondary frame, a primary connecting piece is inserted into the primary winding cap, the primary connecting piece is connected to the circuit board and the primary coil respectively, and a slot is provided at the top of the secondary frame, one end of the positive high voltage pin is inserted into the slot and connected to the secondary coil, and the other end is soldered to the circuit board.

[0018] Compared with the prior art, this utility model improves the high-voltage end structure of the ignition coil, making the ignition coil assembly structure simple and suitable for engine operating conditions. Attached Figure Description

[0019] Figure 1 This is a perspective view of the ignition coil in the embodiment.

[0020] Figure 2This is a cross-sectional view of the ignition coil in the embodiment.

[0021] Figure 3 yes Figure 2 An enlarged view of side A.

[0022] Figure 4 This is a perspective view of the negative high-voltage cap in the embodiment.

[0023] Figure 5 This is a front view of the connecting spring in the embodiment.

[0024] Figure 6 This is a three-dimensional view of the secondary skeleton in the embodiment.

[0025] In the diagram: 100, suppression resistor; 101, high-voltage sheath; 102, cavity; 103, shell;

[0026] 200. Connecting spring; 201. Spring head; 202. Trumpet mouth; 203. Spring middle; 204. Spring bottom; 205. Elastic part; 206. Rigid part; 300. Negative high voltage cap; 301. Cap head; 302. Cap brim; 303. Annular connecting edge; 1. Iron core; 2. Secondary frame; 3. Inner magnetic sleeve; 4. Outer magnetic sleeve; 5. Primary winding cap; 6. Primary connecting piece; 7. Circuit board; 8. Slot; 9. Positive high voltage pin; 10. Grounding pin; 11. Buffer cap; 12. Protrusion. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model. It should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] An embodiment of this utility model provides a high-voltage terminal structure for an ignition coil. This high-voltage terminal structure is used to connect the secondary coil output terminal of the ignition coil and the spark plug to transmit the high-voltage current of the ignition coil.

[0029] Hand it to the spark plug in the engine to ignite it.

[0030] like Figure 2 As shown, a high-voltage terminal structure of an ignition coil includes a suppression resistor 100, which is horizontally disposed at the bottom of the secondary frame 2. One end of the suppression resistor 100 is connected to the output terminal of the secondary coil, and the other end is connected to a negative high-voltage cap 300. The negative high-voltage cap 300 is fitted inside the high-voltage sheath 101 and connected to the suppression resistor 100. A connecting spring 200 is connected at one end to the negative high-voltage cap 300 and at the other end to a spark plug (not shown in the attached figure). The connecting spring 200 provides elastic force to connect with the negative high-voltage cap 300 and the spark plug, and at the same time provides sufficient elastic force to connect with the negative high-voltage cap 300 and the spark plug under engine operating conditions.

[0031] In this embodiment, the suppression resistor 100 is a ceramic resistor. A ceramic resistor with an appropriate resistance value can filter signals in a specific frequency range. In this embodiment, a ceramic resistor is used to filter high-frequency noise in the high-voltage pulse generated by the ignition coil. One terminal of the ceramic resistor is soldered to the output terminal of the secondary coil, and the other terminal is soldered to the edge of the negative high-voltage cap 300.

[0032] like Figure 3 , 4 As shown, the negative high-voltage cap 300 includes an outwardly protruding cap head 301, an arc-shaped cap brim 302, and an annular connecting edge 303 integrally extending from the cap brim 302. The connecting edge is snapped into the bottom of the secondary coil. The bottom of the secondary frame 2 has a protrusion extending downward. The connecting edge is fixed to the protrusion. To firmly fix the connecting edge, it includes a first edge and a second edge. The first edge snaps into the protrusion, and the second edge is set close to the inner wall of the high-voltage sheath, so that the first edge has inward metal stress, which makes the first edge stably fixed to the bottom of the secondary coil. In this embodiment, the output terminal of the suppression resistor 100 is connected to the cap brim 302 of the negative high-voltage cap 300, which increases the contact area of ​​the high-voltage output terminal of the ignition coil, which is conducive to the conduction of high-voltage pulse current. To facilitate a firm connection, the output terminal of the suppression resistor 100 is welded to the cap brim 302 of the negative high-voltage cap 300.

[0033] like Figure 2 , Figure 3 , Figure 5As shown, the connecting spring 200 is designed to have a given length that extends and retracts along the length of the cavity 102 of the high-pressure sheath tube 101. The connecting spring 200 is an irregularly shaped spring consisting of a spring head 201, a spring middle portion 203, and a spring bottom 204. The spring head 201 is located above the cavity 102 and abuts against the cap head 301 of the negative high-pressure cap 300. The spring bottom 204 is located at the end of the cavity 102 and abuts against the spark plug and is electrically connected to the spark plug. The spring middle portion 203 is located inside the cavity 102 and has an elastic helical portion and a rigid helical portion to provide a stable elastic force for the spring head 201 and the spring bottom 204 and to buffer the impact of vibrations during engine operation.

[0034] The spring head 201 is formed by spirally winding an elastic conductive wire, and the structure of the cap head 301 matching the negative high voltage cap 300 ensures that the spring head 201 still has the maximum contact area when it is offset relative to the cap head 301, and that the spring head 201 does not shift relative to the cap head 301 when subjected to spring pressure or external vibration force. Specifically, in this embodiment, the spring head 201 is wound into two opposing flared portions 202, with the flared portions 202 opening outwards. The upper flared portion 202 of the spring head 201 fits against the cap head 301, so that the spring head 201 and the cap head 301 have the maximum contact area. When the spring head 201 is offset by force, the flared portion 202 still has the maximum contact area against the outer surface of the cap head 301. To ensure sufficient flow of high-voltage pulse current, the lower flared portion 202 of the spring head 201 is positioned downwards, and the opening of the lower flared portion 202 is connected to the spiral conductive wire wound in the middle of the spring 200. The lower flared portion 202 is made of multiple conductive wires densely spirally wound with zero spiral gap. The conductive wires are tightly pressed against each other, so that the lower flared portion 202 has a counterweight weight relative to the spiral conductive wire in the middle of the spring 203. This makes the center of gravity of the spring head 201 slightly higher than the spring head 201, so that the spring head 201 is not easily deviated from the cap 301 of the negative high-voltage cap 300 when subjected to the spring's reverse elastic force and external force. This ensures that the connecting spring 200 can maintain a stable connection and allow the high-voltage pulse current to flow under various working environments.

[0035] The spring middle part 203 is made of elastic conductive wire spirally wound into an upper and lower loose elastic part 205 and a middle tight rigid part 206. The upper and lower elastic parts 205 are respectively connected to the spring head 200 and the spring bottom 204 to provide sufficient elastic force for the spring head 201 and the spring bottom 204 to tightly abut against the negative high voltage cap 300 and the spark plug. The elastic part 205 is made of elastic conductive wire with a high elastic coefficient. The spiral gap of the rigid part 206 is in a tight state, the pitch of the elastic conductive wire spiral is zero, and the elastic conductive wires spiral against each other. The rigid part 206 connects the upper elastic part 205 and the lower elastic part 205 to transmit the spring force between the upper and lower elastic parts 205 and at the same time act as a buffer to prevent the elastic part 205 connected to the spring 200 from bouncing violently during the vibration of the engine operation.

[0036] In other embodiments, the elastic part 205 is made of a material with high fatigue resistance, high impact resistance, and high toughness, such as chrome vanadium steel, while the rigid part 206 is made of a general elastic material, such as carbon steel spring steel or low manganese spring steel. The connection point between the elastic part 205 and the rigid part 206 is fixed by laser welding. In this way, the connecting spring 200 has high fatigue resistance and high impact resistance in the elastic part 205, and has a high elastic coefficient and can adapt to a wide range of environmental temperatures. The rigid part 206 uses a low-cost material, which reduces the material cost while meeting the performance requirements. This arrangement further improves the performance parameters of the connecting spring 200 while controlling the material cost.

[0037] The spring bottom 204 is used to connect the spark plug, so the spring bottom 204 is designed as a cone shape of the spark plug head. When the spark plug is inserted, the top of the spark plug sinks into the spring bottom 204 and fully abuts.

[0038] like Figure 1-2 As shown, this utility model also discloses an ignition coil, including a housing 103 and a high-voltage sheath tube 101, wherein the high-voltage end structure of the ignition coil is provided inside the high-voltage sheath tube 101.

[0039] A secondary frame 2 is inserted inside the housing 103. The secondary frame 2 is a hollow structure. An iron core 1 is installed inside the secondary frame 2. An insulating sleeve is arranged around the iron core 1. A primary coil is wound on the insulating sleeve. A secondary coil is wound on the outside of the secondary frame 2. An inner magnetic sleeve 3 is installed outside the housing 103. An outer magnetic sleeve 4 is installed outside the inner magnetic sleeve 3. A circuit board 7 is provided on the housing 103. The circuit board 7 is connected to the primary coil and the secondary coil.

[0040] like Figure 2 , Figure 6 As shown, the secondary frame 2 has a primary winding cap 5 at its top, a primary connecting piece 6 is inserted into the primary winding cap 5, and a primary coil is also wound on the primary winding cap 5. The primary coil is connected to one end of the primary connecting piece 6, and the other end of the primary connecting piece 6 is soldered to the circuit board 7. The secondary frame 2 has a slot 8 at its top, and one end of the positive high voltage pin 9 is inserted into the slot 8 and connected to the secondary coil, while the other end is soldered to the circuit board 7.

[0041] like Figure 2 As shown, a buffer cap 11 is fitted at the bottom of the iron core 1. The buffer cap 11 helps to fix the insulating sleeve. At the same time, the buffer cap 11 has several protrusions 12 around its circumference. The protrusions 12 abut against the inner wall of the secondary frame 2 and limit and fix the iron core 1.

[0042] like Figure 1 , Figure 2As shown, the inner magnetic sleeve 3 and the outer magnetic sleeve 4 are C-shaped cylindrical structures. The inner magnetic sleeve 3 and the outer magnetic sleeve 4 are respectively clamped to the outside of the housing 103, and the grounding pin 10 is inserted into the connection between the inner magnetic sleeve 3 and the outer magnetic sleeve 4 for fixation.

[0043] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A high voltage end structure of an ignition coil for connecting a secondary coil output end of an ignition coil and a spark plug, characterized by: Includes a suppression resistor (100), which is laterally disposed on the top of the high-voltage sheath (101); A connecting spring (200) is a non-circular spring consisting of a spring head (201), a spring middle (203), and a spring bottom (204) disposed along the length of the cavity (102) of the high-pressure sheath (101). The spring head (201) is connected to the negative high-pressure cap (300), and the spring bottom (204) is connected to the spark plug. The spring middle (203) includes an elastic part (205) and a rigid part (206). The elastic part (205) provides elastic force to the connecting spring (200), and the rigid part (206) provides force transmission and buffering for the connecting spring (200). A negative high voltage cap (300) is fastened to the bottom of the secondary frame (2) and connected to the suppression resistor (100).

2. The high tension end structure of an ignition coil according to claim 1, characterized by: The spring head (201) is formed by spirally winding an elastic conductive wire into a flared mouth (202) with opposite sides, and the upper flared mouth (202) abuts against the negative high voltage cap (300).

3. The high tension end structure of an ignition coil according to claim 1, characterized by: The elastic part (205) is connected to the head of the spring (200) and the bottom of the spring (204) respectively. The elastic part (205) is made of high toughness conductive spring steel spirally wound.

4. The high tension end structure of an ignition coil according to claim 1, characterized by: The helical gap of the rigid part (206) is in a tight state, the pitch of the elastic conductive wires formed by the helical structure of the rigid part (206) is zero, and the elastic conductive wires are in helical contact with each other.

5. The high tension end structure of an ignition coil according to claim 1, characterized by: The bottom (204) of the spring is conical.

6. The high tension end structure of an ignition coil according to claim 1, characterized by: The negative high-pressure cap (300) includes an outwardly protruding cap head (301), an arc-shaped cap brim (302), and an annular connecting edge (303) integrally extending from the cap brim (302). The annular connecting edge (303) fastens to the bottom of the secondary frame (2), and the cap head (301) abuts against the spring head (201).

7. The high tension end structure of an ignition coil according to claim 1, characterized by: The elastic part (205) is made of high-toughness spring steel spirally wound, and the rigid part (206) is made of low elastic limit spring steel spirally wound. The elastic part (205) and the rigid part (206) are welded together.

8. An ignition coil comprising a housing (103) and a high-voltage shield tube (101), characterized in that: The high-voltage sheath tube (101) is provided with a high-voltage end structure of an ignition coil as described in any one of claims 1-7.

9. An ignition coil according to claim 8, characterized in that: A secondary frame (2) is inserted inside the housing (103), an iron core (1) is provided inside the secondary frame (2), an insulating sleeve is provided around the iron core (1), a primary coil is wound on the insulating sleeve, a secondary coil is wound on the outside of the secondary frame (2), an inner magnetic sleeve (3) is provided outside the housing (103), and an outer magnetic sleeve (4) is provided outside the inner magnetic sleeve (3).

10. An ignition coil according to claim 9, characterised in that: The secondary frame (2) has a primary winding cap (5) at its top. A primary connecting piece (6) is inserted into the primary winding cap (5). The primary connecting piece (6) is connected to the circuit board (7) and the primary coil respectively. The secondary frame (2) has a slot (8) at its top. One end of the positive high voltage pin (9) is inserted into the slot (8) and connected to the secondary coil. The other end is soldered to the circuit board (7).

Images