Ignition coil, ignition system and engine

Abstract

The utility model discloses an ignition coil, an ignition system and an engine. The ignition coil comprises a high-voltage pack, a resistor, an insulating shell and a conductive spring. A shell of the ignition coil comprises a main body part and an interface part, and a first end part of the interface part is connected with the main body part. The resistor is arranged in the interface part. The insulating shell sleeves the outer wall surface of the interface part and extends to one side, far away from the first end part, of the second end part of the interface part along the first direction. And the conductive spring is arranged in the insulating shell. The second end part of the interface part is also provided with a mounting hole, and the mounting hole comprises a guide hole. The guide hole extends from the end face of the second end of the connector part to the first end, the first end of the guide hole in the extending direction is located on the end face of the second end of the connector part and forms the first end of the mounting hole, and the guide hole is gradually reduced from the first end to the second end of the guide hole. And one end of the conductive spring is positioned in the mounting hole and is electrically connected with the resistor. Therefore, the machining yield of the ignition coil is improved, and the safety performance of the ignition coil is enhanced.

Description

Technical Field

[0001] The utility model relates to the field of automobile engines, in particular to an ignition coil, an ignition system and an engine. Background Art

[0002] The ignition coil is an important component in the engine ignition system. Figure 1a to Figure 1b As shown, the ignition coil 1' in some schemes includes a high-voltage package 2', a resistor 3', an insulating shell 5' and a conductive spring 4', wherein the high-voltage package 2', the resistor 3' and the conductive spring 4' are arranged in order from high to low in the height direction, and are electrically connected to each other. When working, the high-voltage package 2' obtains a low voltage from the power supply connected to it, and converts it into a high voltage through the high-voltage package 2'. Then, through the resistor 3' electrically connected to it, and then through the conductive spring 4' connected to the resistor 3', the high voltage is finally transmitted to the spark plug 6', and finally the air between the positive and negative electrodes at one end of the spark plug 6' is ionized and an electric spark is generated to ignite the fuel mixture in the cylinder. Thus, a whole ignition process is completed.

[0003] However, such a structure also has some problems, one of which is that when assembling the ignition coil 1', the insulating shell 5' and the conductive spring 4' need to be pre-installed at the end of the interface of the high-voltage package 2', and then clamped and pressed into the final position by the tooling. At the same time, in order to make the installation process easy to complete, it is necessary to reduce the friction during the press-fitting process by blowing air under the insulating shell 5' to expand its inner diameter (at this time, the top is blocked by the pre-installed resistor 3' and cannot be blown). However, due to the influence of the blowing, the insulating shell 5' will produce a certain amount of radial deviation, and drive the conductive spring 4' to produce a certain amount of radial deviation, and contact with the end face of the interface of the high-voltage package 2'. In addition, the interface of the high-voltage package 2' is usually made of plastic or plastic-like material. During press-fitting, the offset conductive spring 4' will continue to squeeze or even crush the end face of the interface of the high-voltage package 2', affecting product quality and yield rate. In addition, the offset conductive spring 4' may also be pressed into place while squeezing the end face of the high-voltage package interface, causing the radial dimension of the conductive spring 4' to increase (or be understood as warping outward), thereby scratching the inner wall of the insulating shell 5', causing the durability of the insulating shell 5' to be greatly reduced. During long-term use, the ignition coil 1' may leak electricity, and even cause the engine to catch fire, greatly affecting the safety performance of the entire vehicle.

[0004] It can be seen from the above that the ignition coil in the prior art has a low yield rate and poor safety performance. Utility Model Content

[0005] The utility model provides an ignition coil, an ignition system and an engine, which solve the problems of low yield and poor safety performance of the ignition coil in the prior art.

[0006] The utility model provides an ignition coil for an automobile, the ignition coil comprising a high-voltage package, a resistor, an insulating shell and a conductive spring. The high-voltage package comprises a high-voltage package shell, the shell comprises a main body and an interface portion, the interface portion extends along a first direction, and a first end portion of the interface portion is connected to the main body. The resistor extends along the first direction and is arranged in the interface portion. The insulating shell is sleeved on the outer wall surface of the interface portion and extends along the first direction to a side of the second end portion of the interface portion away from the first end portion. The conductive spring is arranged in the inner cavity of the insulating shell.

[0007] The second end of the interface portion is also provided with a mounting hole, and the mounting hole includes a guide hole. The guide hole extends from the end surface of the second end of the interface portion toward the first end. The first end of the guide hole along its extension direction is located on the end surface of the second end of the interface portion, and the guide hole gradually decreases from its first end to the second end. One end of the conductive spring is located in the mounting hole and is electrically connected to one end of the resistor away from the main body.

[0008] By providing a guide hole at the second end of the interface part, the conductive spring can be guided by the guide hole during installation to the resistor, and can slide into the guide hole relatively smoothly and be electrically connected to the resistor. On the one hand, it prevents the conductive spring from squeezing the second end face of the high-voltage package interface part due to offset during press-fitting, thereby preventing the second end face of the high-voltage package interface part from being crushed. On the other hand, it also prevents the conductive spring from scraping the side wall of the insulating shell due to offset extrusion deformation during press-fitting (it can be understood that one end of the conductive spring squeezes the second end face of the high-voltage package interface part, causing the size of the conductive spring to increase in the radial direction and warp outward), thereby preventing the side wall of the insulating shell from being scratched and causing leakage and fire. Therefore, the yield rate of the ignition coil during processing is improved, the product cost is reduced, and its safety performance is also enhanced.

[0009] In some embodiments, one end of the conductive spring is configured as a tapered structure that gradually contracts in a direction from away from the resistor to close to the resistor, and an end surface of the tapered structure close to the resistor abuts against an end surface of an end of the resistor away from the main body, so that the conductive spring is electrically connected to the resistor. The second end of the mounting hole extends to the position of the end surface of the end of the resistor away from the main body.

[0010] By setting the end of the conductive spring close to the resistor as a tapered structure, or it can be understood that the end of the conductive spring that cooperates with the resistor is thinner, the gap between the conductive spring and the end face of the second end of the interface part is further increased when the conductive spring is installed, and it is also less likely for the conductive spring to shift to contact the end face of the second end of the interface part when installed.

[0011] In addition, the conductive spring abuts against the end face of the resistor away from the main body. The electrical connection is made by abutting rather than fixed connection. On the one hand, the conductive spring can be pre-compressed and the pre-tightening force can be provided by the conductive spring, thereby ensuring the stability of the electrical connection between the conductive spring and the resistor. On the other hand, the difficulty of installing the conductive spring and the resistor is reduced, making it easier to assemble and match, reducing the installation time and product cost.

[0012] In some embodiments, the tapered structure includes a contraction section and a straight section connected in sequence in the first direction, and an end surface of the straight section away from the contraction section abuts against the resistor. The mounting hole also includes a positioning hole extending along a straight line in the first direction, one end of the positioning hole is connected to the second end of the guide hole, and the other end constitutes the second end of the mounting hole.

[0013] By further configuring the mounting hole to include a positioning hole, the mounting hole has a certain positioning function. During press-fitting, the conductive spring is guided into the positioning hole through the guide hole, and the positioning hole cooperates with the straight line segment of the tapered structure to achieve the positioning function, so that the conductive spring can be more stable during press-fitting. In addition, the gap between the conductive spring and the interface part is increased, which can enhance the anti-vibration ability of the conductive spring during daily use, making it more stable during operation and having a longer service life.

[0014] In some embodiments, the linear segment of the tapered structure is entirely located in the mounting hole, which maximizes the positioning capability of the mounting hole and reduces the displacement space of the conductive spring after it is installed in place, thereby maximally ensuring the reliability and service life of the ignition coil structure.

[0015] In some embodiments, the wall surface of the guide hole is a conical surface, and the wall surface of the positioning hole is a cylindrical surface. By setting such a structure, the overall structure of the mounting hole is simple, the shape is regular, and it is easy to process. This reduces the processing time and processing cost. In addition, the conical surface and cylindrical surface structures are also symmetrical structures, and there is no need to distinguish between the front and the back during installation. The cost is low and the installation efficiency is high. Moreover, it can be more consistent with the shape of the conductive spring, and the installation effect is better.

[0016] In some embodiments, the area on the inner wall surface of the insulating shell that matches the second end of the interface part is set as a step structure. Or it can be understood that in the first direction (also understood as the length direction of the insulating shell), the end face of the second end of the interface part is located directly above the step surface of the step structure. By further hiding the end face of the interface part of the high-voltage package above the countersunk step, the possibility of the conductive spring contacting the end face of the interface part during press-fitting is minimized.

[0017] In some embodiments, the interface of the high-voltage package shell is integrally formed on the outer wall of the resistor by injection molding. On the one hand, the connection between the resistor and the interface of the high-voltage package shell can be made more secure. On the other hand, the structure can be simpler and the cost can be lowered.

[0018] In some embodiments, the high-voltage package further includes a primary coil, a secondary coil and an iron core disposed in the main body of the high-voltage package shell, the primary coil and the secondary coil are respectively wound around the iron core, the primary coil is used to be electrically connected to the power supply, and the secondary coil is electrically connected to an end of the resistor close to the main body. Thus, low voltage is obtained from an external power supply and converted into high voltage for spark plug ignition.

[0019] The utility model also provides an ignition system, which includes a spark plug and an ignition coil provided in any of the above embodiments. The spark plug is electrically connected to the other end of the conductive spring, so that the ignition system is not prone to misfire due to leakage of the ignition coil.

[0020] The utility model also provides an engine, comprising the ignition system provided by the above embodiment, thereby improving the safety performance and durability of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1a It is a schematic diagram of the structure of the ignition coil and the spark plug in some schemes;

[0022] Figure 1b for Figure 1a A partial enlarged view of the A' part;

[0023] Figure 2 It is a three-dimensional structural schematic diagram of an ignition coil and a spark plug according to an embodiment of the utility model;

[0024] Figure 3a This is a schematic diagram of the internal structure of an ignition coil and a spark plug according to an embodiment of the utility model;

[0025] Figure 3b for Figure 3a A partial enlarged view of part A;

[0026] Figure 4 This is a schematic diagram of the matching structure of the resistor, the interface part and the insulating shell in the embodiment of the utility model;

[0027] Figure 5 It is a partial enlarged view of the conductive spring of the ignition coil of the embodiment of the utility model;

[0028] Figure 6 The figure is a schematic diagram of the principle of the high-voltage package of the ignition coil according to the embodiment of the utility model.

[0029] Description of reference numerals:

[0030] Some solutions:

[0031] 1', ignition coil;

[0032] 2', high voltage package

[0033] 3', resistance;

[0034] 4', conductive spring;

[0035] 5', insulating shell;

[0036] 6', spark plug;

[0037] This application:

[0038] 1. Ignition coil;

[0039] 2. High-voltage package; 21. High-voltage package shell; 211. Interface; 211A. First end; 211B. Second end; 2111. Step structure; 2111A. Step surface; 2111B. First inner wall surface; 2111C. Second inner wall surface; 212. Main body;

[0040] 22. Primary coil; 23. Secondary coil; 24. Iron core;

[0041] 3. Mounting hole; 3A. First end; 3B. Second end; 31. Guide hole; 31A. First end; 31B. Second end; 32. Positioning hole;

[0042] 4. Resistance;

[0043] 5. Insulation shell;

[0044] 6. conductive spring; 61. tapered structure; 61A. contraction section; 61B. straight section;

[0045] 7. Spark plug;

[0046] z, first direction. DETAILED DESCRIPTION

[0047] The following is an explanation of the implementation of the present invention by specific specific embodiments. Those skilled in the art can easily understand other advantages and functions of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0048] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0049] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0050] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0051] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0052] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0053] It should be noted that for the sake of convenience, the length direction of the ignition coil is taken as the first direction z. In addition, the directions such as up and down, front and back, left and right in the text are based on the general viewing angle of the ignition coil facing the user when it is normally set.

[0054] When the ignition coil provided in the prior art is pressed, the offset conductive spring 4' will continue to squeeze or even crush the interface end face of the high-voltage package 2', affecting the product quality and yield rate. At the same time, when pressed, the conductive spring 4' may be greatly deformed, thereby scratching the inner wall of the insulating shell 5', causing the durability of the insulating shell 5' to be greatly reduced. In long-term use, the ignition coil 1' may leak electricity, and even cause the engine to catch fire, greatly affecting the safety performance of the entire vehicle. As can be seen from the above, the ignition coil in the prior art has a low yield rate and poor safety performance.

[0055] Therefore, the utility model provides an ignition coil, an ignition system and an engine, which solve the problems of low yield and poor safety performance of the ignition coil in the prior art.

[0056] See also Figure 2-Figure 4 , Figure 2 It is a three-dimensional structural schematic diagram of an ignition coil and a spark plug according to an embodiment of the utility model; Figure 3a This is a schematic diagram of the internal structure of an ignition coil and a spark plug according to an embodiment of the utility model; Figure 3b for Figure 3a A partial enlarged view of part A; Figure 4 The figure is a schematic diagram of the matching structure of the resistor, the interface part and the insulating shell according to the embodiment of the utility model.

[0057] like Figure 2-Figure 4 As shown, the ignition coil 1 includes a high-voltage package 2, a resistor 4, an insulating shell 5 and a conductive spring 6. The high-voltage package 2 includes a high-voltage package shell 21, and the high-voltage package shell 21 includes a main body 212 and an interface 211, the interface 211 extends along the first direction z, and the first end 211A of the interface 211 is connected to the main body 212. The resistor 4 extends along the first direction z and is arranged in the interface 211. The insulating shell 5 is sleeved on the outer wall surface of the interface 211 and extends along the first direction z to the side of the second end 211B of the interface 211 away from the first end 211A. The conductive spring 6 is arranged in the inner cavity of the insulating shell 5.

[0058] The second end 211B of the interface portion 211 is further provided with a mounting hole 3, and the mounting hole 3 includes a guide hole 31. The guide hole 31 extends from the end surface of the second end 211B of the interface portion 211 toward the first end 211A. The first end 31A of the guide hole 31 along its extension direction is located on the end surface of the second end 211B of the interface portion 211, and constitutes the first end 3A of the mounting hole 3. Moreover, the guide hole 31 gradually decreases from the first end 31A of the guide hole 31 to the second end 31B of the guide hole 31. One end of the conductive spring 6 is located in the mounting hole 3, and is electrically connected to one end of the resistor 4 away from the main body 211.

[0059] Here, it can be understood that: the high-voltage package 2, the resistor 4 and the conductive spring 6 are arranged in sequence in the first direction z and are electrically connected to each other, and an insulating shell 5 is sleeved on the interface part 211 of the high-voltage package shell 21, and the insulating shell 5 is used to wrap the interface part 211, the resistor 4 and the conductive spring 6. A mounting hole 3 is also provided in the interface part 211 of the high-voltage package shell 21. The first end 3A of the mounting hole 3 coincides with the end face of the second end 211B of the interface part. And the mounting hole 3 also includes a guide hole 31. The first end 31A of the guide hole constitutes the first end 3A of the mounting hole 3. And the guide hole gradually narrows from the first end 31A to the second end 31B. And at least part of one end of the conductive spring 6 is located in the mounting hole 3.

[0060] By providing the guide hole 31 at the second end 211B of the interface portion 211, the conductive spring 6 can be guided by the guide hole 31 during the installation process to the resistor 4, and can slide into the guide hole 31 relatively smoothly and be electrically connected to the resistor 4. On the one hand, the conductive spring 6 is prevented from squeezing the end face of the second end 211B of the high-voltage package interface portion 211 due to offset during press-fitting, thereby preventing the end face of the second end 211B of the high-voltage package interface portion 211 from being crushed. On the other hand, the conductive spring 6 is also prevented from being squeezed and deformed due to offset during press-fitting (it can be understood that one end of the conductive spring 6 squeezes the end face of the second end 211B of the high-voltage package interface portion 211, causing the size of the conductive spring 6 to increase in the radial direction and tilt outward) and scratching the side wall of the insulating housing 5, thereby preventing the side wall of the insulating housing 5 from being scratched and causing leakage and fire. Therefore, the yield rate of the ignition coil during processing is improved, the product cost is reduced, and its safety performance is also enhanced.

[0061] The above is a preliminary description of the structure of the utility model. It should be noted that the structure and matching relationship of each component are not limited. The possible specific structure and function of each component will be specifically described below.

[0062] First, the specific structure of the conductive spring and the guide hole and their matching method are described.

[0063] See also Figure 5 , Figure 5 This is a partial enlarged view of the conductive spring of the ignition coil according to the embodiment of the utility model.

[0064] like Figure 3b-Figure 5 As shown, combined with Figure 3a It is understood that, in one embodiment, one end of the conductive spring 6 is configured as a tapered structure 61 that gradually contracts from away from the resistor 4 to close to the resistor 4. And the end face of the tapered structure 61 close to the resistor 4 abuts against the end face of the end of the resistor 4 away from the main body 212, so that the conductive spring 6 and the resistor 4 are electrically connected. Correspondingly, at this time, the second end 3B of the mounting hole 3 extends to the position of the end face of the end of the resistor 4 away from the main body 212. Here, it can be understood that: the second end 3B of the mounting hole 3 extends to the end face of the resistor 4, so that the end face of the resistor 4 is exposed to the outside, and the end of the conductive spring 6 electrically connected to the resistor 4 is set to a gradually shrinking structure, and directly abuts against the resistor 4 and is electrically connected to it.

[0065] By setting the end of the conductive spring 6 close to the resistor 4 as a tapered structure 61, or it can be understood that the end of the conductive spring 6 that cooperates with the resistor 4 is thinner, the gap between the conductive spring 6 and the end face of the second end of the interface part is further increased when the conductive spring 6 is installed, and it is also less likely for the conductive spring 6 to deviate and contact the end face of the second end 211B of the interface part 211 when installed.

[0066] Furthermore, the conductive spring 6 and the resistor 4 abut against the end surface away from the main body 212. The electrical connection is made by abutting rather than fixed connection. On the one hand, the conductive spring 6 can be pre-compressed and the conductive spring 6 can be used to provide a pre-tightening force, thereby ensuring the stability of the electrical connection between the conductive spring 6 and the resistor 4. On the other hand, the installation difficulty of the conductive spring 6 and the resistor 4 is reduced, making it easier to assemble and match, reducing the installation time and also reducing the product cost.

[0067] It should be noted that the specific structure of the tapered structure 61 is not limited. And according to the change of the specific structure of the tapered structure 61, the guide hole 31 matched therewith may also produce corresponding structural changes. The following are possible specific structures and matching schemes of the two.

[0068] First, the tapered structure 61 may include multiple segments, thereby further expanding the functionality of the tapered structure 61 .

[0069] like Figure 5 As shown, combined with Figure 3b-Figure 4It is understood that in one embodiment, the tapered structure 61 includes a contraction section 61A and a straight section 61B connected in sequence in the first direction z, and an end surface of the straight section 61B away from the contraction section 61A abuts against the resistor 4. Correspondingly, the mounting hole 3 also includes a positioning hole 32 extending along a straight line in the first direction, one end of the positioning hole 32 is connected to the second end 31B of the guide hole 31, and the other end constitutes the second end 3B of the mounting hole 3.

[0070] Here, it may be understood that the tapered structure 61 may further include a contraction section 61A and a straight section 61B, one end of the straight section 61B is connected to the resistor 4, and the other end is connected to the contraction section 61A. And the mounting hole 3 is also provided with a guide hole 31 and a positioning hole 32, so as to correspond to the contraction section 61A and the straight section 61B in the tapered structure 61. By further setting the mounting hole 3 to include a positioning hole 32, the mounting hole 3 has a certain positioning function. During press-fitting, the conductive spring 6 is guided into the positioning hole 32 through the guide hole 31, and the positioning hole 32 cooperates with the tapered structure straight section 61B, thereby realizing the positioning function, so that the conductive spring 6 can be more stable during press-fitting. And in daily use, the anti-vibration ability of the conductive spring 6 can also be enhanced, making it more stable during operation and having a longer service life.

[0071] In another alternative embodiment, the tapered structure 61 may include a plurality of contraction segments 61A and a plurality of straight segments 61B, and the self-positioning ability of the conductive spring 6 is further improved by a more complex tapered structure 61, and the mounting hole 3 having a corresponding structure is provided, so that the entire ignition coil has a stronger anti-interference ability to external vibration during operation. This application is not limited here.

[0072] Furthermore, the length ratio of the contraction segment and the straight segment in the first direction is not limited.

[0073] Secondly, the matching relationship between the tapered structure of the conductive spring and the mounting hole is not limited.

[0074] like Figure 3b As shown, combined with Figure 4-Figure 5 It is understood that, in one embodiment, the straight section 61B of the tapered structure 61 is entirely located in the mounting hole 3. This maximizes the positioning capability of the mounting hole 3, so that the conductive spring 6 can be offset in a smaller space after being installed in place, and also maximizes the reliability and service life of the ignition coil 1 structure.

[0075] Finally, the specific shape of the mounting hole is not limited.

[0076] like Figure 3bAs shown, in one embodiment, the wall surface of the guide hole 31 is a conical surface, and the wall surface of the positioning hole 32 is a cylindrical surface. By setting it as such a structure, the overall structure of the mounting hole 3 is simple, the shape is regular, and it is easy to process. In addition, the processing time and processing cost are reduced. In addition, the conical surface type and the cylindrical type structure are also symmetrical structures, and there is no need to distinguish between the front and the back during installation. The cost is low and the installation efficiency is high. Moreover, it can be more consistent with the shape of the conductive spring 6, and the installation effect is better.

[0077] In another alternative embodiment, the specific structure of the guide hole 31 may also be a bracket-shaped, prism-shaped or other different shapes, and the present application does not limit this.

[0078] The above is a detailed description of the specific structure of the conductive spring and the mounting hole and the matching relationship between the two. The specific structure and matching method of other components will be described in detail below.

[0079] It should be noted that the specific structure of the high-voltage package shell is not limited.

[0080] In one embodiment, the interface portion 211 of the high-voltage package housing 21 is integrally formed on the outer wall of the resistor 4 by an injection molding process. The interface portion 211 formed by injection molding is more firmly connected to the resistor 4. On the other hand, it can also achieve a simpler structure and lower cost.

[0081] In another alternative embodiment, the interface portion 211 of the high-voltage package housing 21 may not be integrally formed with the resistor 4, but the resistor 4 may be fixed in the interface portion 211 by press-fitting, and the present application does not make any limitation thereto.

[0082] Those skilled in the art will appreciate that the specific structure of the interface portion is not limited.

[0083] like Figure 4 As shown, combined with Figure 3b and Figure 5It is understood that, in one embodiment, the area on the inner wall surface of the insulating shell 5 that cooperates with the second end 211B of the interface part 211 is set to a step structure 2111. The step structure 2111 includes a first inner wall surface 2111B, a step surface 2111A, and a second inner wall surface 2111C. Among them, the first inner wall surface 2111B cooperates with the outer wall surface of the second end 211B of the interface part 211, and the second inner wall surface 2111C is spaced apart from the second end 211B of the interface part 211 in the first direction z and extends away from the second end 211B. One end of the step surface 2111A is connected to the first inner wall surface 2111B, and the other end is connected to the second inner wall surface 2111C. In the length direction of the insulating shell 5 (i.e., the first direction z), the end surface of the second end 211B of the interface part 211 is located directly above the step surface 2111A of the step structure 2111. (Or it can be understood as: the end surface of the second end portion 211B of the interface portion 211 is completely hidden above the step surface 2111A.) Thus, the possibility of the conductive spring 6 contacting the end surface of the interface portion 211 during press-fitting is minimized.

[0084] The above is a description of the specific structure of the interface part. The following is a description of the possible specific structure of the high-voltage package.

[0085] It should be noted that the specific structure of the high-voltage package is not limited.

[0086] See also Figure 6 , Figure 6 The figure is a schematic diagram of the principle of the high-voltage package of the ignition coil according to the embodiment of the utility model.

[0087] like Figure 6 As shown, combined with Figure 3a It is understood that in one embodiment, the high-voltage package 2 further includes a primary coil 22, a secondary coil 23 and an iron core 24 disposed in the main body 212 of the high-voltage package shell 21, the primary coil 22 and the secondary coil 23 are respectively wound around the iron core 24, the primary coil 22 is used to be electrically connected to a power source (not shown in the figure), and the secondary coil 23 is electrically connected to an end of the resistor 4 close to the main body 212. Thus, the process of obtaining a low voltage from an external power source and converting it into a high voltage through the high-voltage package 2 is completed, and a high voltage is provided for the spark plug 7 to ignite.

[0088] like Figure 2-Figure 3a As shown, the utility model further provides an ignition system, which includes a spark plug 7 and an ignition coil 1 provided in any one of the above embodiments, so that the ignition system is not prone to misfire due to leakage of the ignition coil 1.

[0089] It should be noted that there is no limit to the connection method between the spark plug and the ignition coil.

[0090] like Figure 3a As shown, combined with Figure 2 It is understood that in one embodiment, the spark plug 7 and the ignition coil 1 are sequentially arranged and fixedly connected in the first direction z, and the spark plug 7 is electrically connected to the conductive spring 6. At this time, the entire ignition process is: low-voltage electricity is converted into high-voltage electricity by the power supply (not shown in the figure) through the high-voltage package 2, and is finally transmitted to the spark plug 7 through the resistor 4 and the conductive spring 6 connected thereto, so that the air between the positive and negative electrodes of the spark plug 7 is ionized, thereby generating an electric spark, and finally igniting the fuel mixture.

[0091] The utility model also provides an engine, comprising a cylinder body and the ignition system provided in the above embodiment, thereby improving the safety performance and durability of the engine.

[0092] Those skilled in the art will appreciate that the connection relationship between the cylinder body and the components is not limited.

[0093] In one embodiment, the end of the spark plug 7 away from the conductive spring 6 is fixedly connected to the cylinder body. The high-voltage package 2 is also fixedly connected to the cylinder body, so that the ignition system is relatively stably fixed to the cylinder body. In another alternative embodiment, the spark plug 7 can also be fixedly connected only to the ignition coil 1. This application is not limited here.

[0094] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above contents are further detailed descriptions of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. An ignition coil, characterized in that: The ignition coil comprises: A high-voltage package, the high-voltage package comprising a high-voltage package shell, the high-voltage package shell comprising a main body and an interface portion, the interface portion extends along a first direction, and a first end portion of the interface portion is connected to the main body; a resistor extending along the first direction and disposed in the interface portion; An insulating shell, which is sleeved on the outer wall surface of the interface portion and extends along the first direction to a side of the second end of the interface portion away from the first end; A conductive spring, wherein the conductive spring is disposed in the inner cavity of the insulating shell; Wherein, the second end of the interface part is also provided with a mounting hole, and the mounting hole includes a guide hole, and the guide hole extends from the end face of the second end of the interface part toward the first end; the first end of the guide hole along its extension direction is located on the end face of the second end of the interface part and constitutes the first end of the mounting hole, and the guide hole gradually decreases from its first end to the second end; one end of the conductive spring is located in the mounting hole and is electrically connected to an end of the resistor away from the main body.

2. The ignition coil according to claim 1, characterized in that One end of the conductive spring is configured as a tapered structure that gradually contracts in a direction from away from the resistor to close to the resistor, and an end surface of the tapered structure close to the resistor abuts against an end surface of an end of the resistor away from the main body, so that the conductive spring is electrically connected to the resistor; The second end of the mounting hole extends to the position where the end surface of the resistor is located away from the end of the main body.

3. The ignition coil according to claim 2, characterized in that: The tapered structure comprises a contraction segment and a straight segment connected in sequence in the first direction, and an end surface of the straight segment away from the contraction segment abuts against the resistor; The mounting hole further comprises a positioning hole extending along a straight line in the first direction, one end of the positioning hole is connected to the second end of the guide hole, and the other end constitutes the second end of the mounting hole.

4. The ignition coil according to claim 3, characterized in that: The straight section of the tapered structure is entirely located within the mounting hole.

5. The ignition coil according to claim 3, characterized in that: The wall surface of the guide hole is a conical surface, and the wall surface of the positioning hole is a cylindrical surface.

6. The ignition coil according to claim 1, characterized in that An area on the inner wall surface of the insulating shell that cooperates with the second end of the interface part is set as a step structure, and in the first direction, the end surface of the second end of the interface part is located directly above the step surface of the step structure.

7. The ignition coil according to claim 1, characterized in that: The interface portion of the high-voltage package housing is integrally formed on the outer wall surface of the resistor through an injection molding process.

8. The ignition coil according to any one of claims 1 to 7, characterized in that: The high-voltage package also includes a primary coil, a secondary coil and an iron core arranged in the main body of the high-voltage package shell, the primary coil and the secondary coil are respectively wound around the iron core, the primary coil is used to be electrically connected to a power supply, and the secondary coil is electrically connected to an end of the resistor close to the main body.

9. An ignition system, comprising a spark plug, characterized in that: The ignition system further comprises an ignition coil as claimed in any one of claims 1 to 8; the spark plug is electrically connected to the other end of the conductive spring.

10. An engine comprising a cylinder block, characterized in that: The engine comprises the ignition system as claimed in claim 9; the high-pressure package housing of the ignition system is fixedly connected to the cylinder body.

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