High-voltage connecting structure for ignition coil and ignition coil

Abstract

The utility model relates to a high-voltage connecting structure for an ignition coil and the ignition coil, the high-voltage connecting structure comprises a resistance rod, the resistance rod is provided with a first end used for being connected with a high-voltage output terminal and a second end used for being connected with a connecting spring, the second end of the resistance rod is provided with a second connecting cap, and the first end of the resistance rod is connected with the high-voltage output terminal; a butt joint groove is formed in one end, far away from the resistance rod, of the second connecting cap; the first end of the connecting spring is installed in the butt joint groove in a centering mode, the shape of the first end of the connecting spring is matched with the shape of the butt joint groove, and the second end of the connecting spring is used for being connected with the spark plug. According to the scheme, by arranging the connecting cap and the butt joint groove, the connecting spring and the resistance rod can be always kept centered, deflection virtual connection of the connecting spring and the resistance rod caused by vibration of an engine is avoided, the connecting stability of the connecting spring and the resistance rod is improved, and the reliability is higher.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a high-voltage connection structure for an ignition coil and an ignition coil. Background Art

[0002] The ignition coil is an important part of the engine ignition system. It is used to provide high voltage to the spark plug of the engine so that the spark plug can generate sparks with sufficient energy to start the engine. The ignition coil mainly includes a high-voltage output terminal and a high-voltage spring. The high-voltage spring is connected between the high-voltage output terminal of the ignition coil and the spark plug of the engine to transmit high voltage.

[0003] At present, in order to improve the electromagnetic compatibility performance of the ignition system, a suppression resistor is usually added to the high-voltage output terminal of the ignition coil. In order to ensure the reliability of the connection between the high-voltage spring and the suppression resistor, the end of the high-voltage spring is usually set to a bowl-shaped wrap around one end of the suppression resistor, which has good neutrality. However, the disadvantages of this docking are also obvious. The engine will produce certain vibrations during long-term operation. The internal suppression resistor and the high-voltage spring of the ignition coil are in a state of relative motion for a long time. Long-term vibration may cause the bowl of the high-voltage spring at one end of the docking suppression resistor to become larger, which can easily cause a virtual connection between the resistor and the spring. At the least, the product arc damages the resistor, resulting in a decrease in energy transfer efficiency, and at worst, it affects the engine performance. Utility Model Content

[0004] Based on this, the utility model provides a high-voltage connection structure for an ignition coil and an ignition coil, so as to solve the problem that a connection spring is prone to produce a virtual connection with a resistor.

[0005] On the one hand, the utility model provides a high-voltage connection structure for an ignition coil, the high-voltage connection structure is used to connect the high-voltage output terminal of the ignition coil and the spark plug of the engine, and the high-voltage connection structure includes:

[0006] A resistor rod, the resistor rod having a first end for connecting with the high-voltage output terminal and a second end for connecting with a connecting spring, a second connecting cap being arranged on the second end of the resistor rod, and a docking groove being arranged on an end of the second connecting cap away from the resistor rod;

[0007] A connecting spring, wherein the first end of the connecting spring is centrally installed in the docking groove, and the shape of the first end of the connecting spring matches the shape of the docking groove, and the second end of the connecting spring is used to connect with the spark plug.

[0008] In one embodiment, the connecting spring comprises a first section, a second section and a third section sequentially connected from the first end to the second end;

[0009] The spiral gap of the second section is in a tight state, and the diameter of the second section is larger than the diameters of the first section and the third section.

[0010] In one embodiment, a pitch between the first end and the second end of the connecting spring is smaller than a pitch between the first section and the third section.

[0011] In one embodiment, the docking groove is a cylindrical straight groove, and the diameter of the first end of the connecting spring is equal to the diameter of the docking groove.

[0012] In one embodiment, the diameter of the first section is greater than the diameter of the first end of the connecting spring.

[0013] In one embodiment, the docking groove is a flared groove, and the first end of the connecting spring is a cone that matches the flared groove.

[0014] In one embodiment, the diameter of the first section is greater than the diameter of the opening of the docking groove.

[0015] In one embodiment, the second end of the connecting spring is flared.

[0016] In one of the embodiments, a first connection cap is disposed at the first end of the resistor rod, and a slot for inserting the high-voltage output terminal is disposed on a side of the first connection cap away from the resistor rod.

[0017] On the other hand, the utility model further provides an ignition coil, which includes the high-voltage connection structure of any of the above embodiments.

[0018] Beneficial effect: The high-voltage connection structure provides a second connecting cap at the second end of the resistor rod and provides a docking groove on the second connecting cap, so that the first end of the connecting spring can be embedded in the docking groove of the second connecting cap, thereby realizing the connection between the connecting spring and the resistor rod. The shape of the first end of the connecting spring matches the shape of the docking groove, so that the connecting spring and the docking groove can always be kept centered, thereby keeping the connecting spring and the resistor rod centered, avoiding skewed virtual connection between the connecting spring and the resistor rod due to engine vibration, improving the connection stability between the connecting spring and the resistor rod, and having higher reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a structural schematic diagram of a high voltage connection structure for an ignition coil in one embodiment;

[0020] Figure 2 A schematic diagram of the structure of a connection cap and a resistor rod in a high voltage connection structure of an embodiment;

[0021] Figure 3It is a schematic structural diagram of a connection cap and a resistor rod in a high voltage connection structure of another embodiment;

[0022] Figure 4 It is a schematic structural diagram of the cooperation between the connecting spring and the second connecting cap in the high-voltage connecting structure of an embodiment.

[0023] The reference numerals in the drawings of the specification include: resistance rod 1 , connecting spring 2 , first section 201 , second section 202 , third section 203 , second connecting cap 3 , docking groove 301 , first connecting cap 4 . DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0025] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention.

[0026] The structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0027] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0028] On the one hand, an embodiment of the utility model provides a high-voltage connection structure for an ignition coil, which is used to connect the high-voltage output terminal of the ignition coil and the spark plug of the engine to transfer the high-voltage current of the ignition coil to the spark plug of the engine to ignite the engine.

[0029] Specifically, the high voltage connection structure for an ignition coil provided in an embodiment of the utility model includes:

[0030] A resistor rod 1, the resistor rod 1 having a first end for connecting with a high voltage output terminal and a second end for connecting with a connecting spring 2, a second connecting cap 3 being provided on the second end of the resistor rod 1, and a docking groove 301 being provided at an end of the second connecting cap 3 away from the resistor rod 1;

[0031] The connecting spring 2 has a first end which is centrally installed in the docking groove 301 and a shape of the first end of the connecting spring 2 matches a shape of the docking groove 301 . The second end of the connecting spring 2 is used to connect with the spark plug.

[0032] The high-voltage connection structure provided by the embodiment of the utility model provides a second connecting cap 3 at the second end of the resistor rod 1, and provides a docking groove 301 on the second connecting cap 3, so that the first end of the connecting spring 2 can be embedded in the docking groove 301 of the second connecting cap 3, thereby realizing the connection between the connecting spring 2 and the resistor rod 1, and the shape of the first end of the connecting spring 2 matches the shape of the docking groove 301, so that the connecting spring 2 and the docking groove 301 can always be kept centered, thereby keeping the connecting spring 2 and the resistor rod 1 centered, avoiding the connection spring 2 and the resistor rod 1 from being skewed and virtually connected due to the vibration of the engine, improving the connection stability of the connecting spring 2 and the resistor rod 1, and improving reliability.

[0033] The high voltage connection structure for an ignition coil provided by an embodiment of the utility model is described in detail below in conjunction with the accompanying drawings.

[0034] Figure 1 This is a schematic diagram of a high voltage connection structure disclosed in at least one embodiment of the present utility model. Figure 1 The high voltage connection structure includes a resistor rod 1 and a connection spring 2.

[0035] In this embodiment, the resistor rod 1 is a cylindrical structure made of carbon material, and the two ends of the resistor rod 1 along its length direction are respectively a first end and a second end. Figure 1 In the direction shown, the first end of the resistor rod 1 is the upper end, and the second end is the lower end. During assembly, the first end of the resistor rod 1 is connected to the high-voltage output terminal of the ignition coil, and the second end of the resistor rod 1 is connected to the spark plug through the connecting spring 2, so that the resistor rod 1 is connected between the ignition coil and the spark plug. The current of the ignition system can be adjusted through the resistor rod 1, the interference electromagnetic waves generated by the sparks can be weakened, and the stability of the ignition system can be ensured.

[0036] For details, see Figure 1 In this embodiment, a first connecting cap 4 is provided at the first end of the resistor rod 1, and a second connecting cap 3 is provided at the second end of the resistor rod 1. The first connecting cap 4 is connected to the high-voltage output terminal of the ignition coil, and the second connecting cap 3 is connected to the connecting spring 2. The connection stability between the resistor rod 1 and the high-voltage output terminal and the connecting spring 2 and the stability of current transmission can be improved.

[0037] In this embodiment, the first connection cap 4 and the second connection cap 3 are both made of metal conductive materials, such as copper materials, which can ensure the current transmission stability between the resistor rod 1 and the connection spring 2 and the high-voltage output terminal.

[0038] In this embodiment, the first connecting cap 4 and the second connecting cap 3 have the same structure, and the structure of the second connecting cap 3 is described below by taking the second connecting cap 3 as an example.

[0039] See also Figure 2 The second connecting cap 3 is a cylindrical tube sleeve structure that matches the shape of the resistor rod 1, and the inner diameter of the second connecting cap 3 is adapted to the diameter of the resistor rod 1, so that the second connecting cap 3 can be sleeved on the second end of the resistor rod 1, and the second connecting cap 3 is fixedly connected to the second end of the resistor rod 1. For example, the second connecting cap 3 and the resistor rod 1 can be fixedly sleeved by an interference fit or by a threaded connection.

[0040] See also Figure 1 and Figure 2 In the present embodiment, a docking groove 301 is provided at one end of the second connecting cap 3 away from the resistor rod 1. With such a configuration, the connecting spring 2 can be embedded in the docking groove 301 of the second connecting cap 3, which can not only avoid the irreversible deformation of the connecting spring 2 due to the vibration of the engine and the virtual connection with the resistor rod 1, but also ensure the concentricity of the connecting spring 2 and the resistor rod 1, thereby improving the connection stability of the connecting spring 2 and the resistor rod 1 and ensuring the output stability of the ignition coil.

[0041] For details, see Figure 2 The butt joint groove 301 is formed by the inward depression of one end of the second connection cap 3 away from the resistor rod 1, and the inwardly depressed portion of the second connection cap 3 abuts against the end of the resistor rod 1. In this way, the butt joint groove 301 is formed by the structure of the second connection cap 3 itself, which will not destroy the structural integrity of the second connection cap 3, and the structural strength is stronger, which can improve the structural stability of the entire high-voltage connection structure.

[0042] Accordingly, in this embodiment, the second connection cap 3 is mounted on the first end of the resistor rod 1 , and a slot (not shown in the figure) for inserting the high-voltage output terminal is provided on the side of the second connection cap 3 away from the resistor rod 1 .

[0043] See also Figure 1In this embodiment, the connecting spring 2 includes a first end and a second end along the length direction and a first section 201, a second section 202 and a third section 203 which are sequentially connected along the direction from the first end to the second end. Among them, the first end of the connecting spring 2, i.e., the upper end, is used to connect with the resistor rod 1, and the second end, i.e., the lower end, is used to connect with the spark plug of the engine. The first section 201 of the connecting spring 2 is the part connected to the first end, the third section 203 is the part connected to the second end, and the second section 202 is the middle part of the connecting spring 2.

[0044] See also Figure 1 In this embodiment, the spiral gap of the second section 202 of the connecting spring 2 is in a tight state, that is, the pitch of the second section 202 is close to zero, and the diameter of the second section 202 is larger than the diameters of the first section 201 and the third section 203. In this way, the diameter of the second section 202 of the connecting spring 2 is larger, so that when the connecting spring 2 is installed in the connecting tube of the ignition coil, the second section 202 of the connecting spring 2 can contact the inner wall of the connecting tube or have a small gap, while the first section 201 and the third section 3 have a gap with the inner wall of the connecting tube, so that the connecting spring 2 can improve the positioning effect from the middle and avoid the deflection of the connecting spring 2. The spiral gap of the second section 202 is in a tight state, so that during the vibration of the engine, the first section 201 and the third section 203 are mainly used for vibration absorption and buffering, and the second section 202 of the connecting spring 2 is almost not deformed, ensuring the positioning effect of the second section 202, which can further avoid the deflection of the connecting spring 2 and ensure the centering of the connecting spring 2 and the connecting tube.

[0045] For further information, see Figure 1 In this embodiment, the pitch of the first end and the second end of the connecting spring 2 is smaller than the pitch of the first section 201 and the third section 203. With such a configuration, during the vibration absorption process of the connecting spring 2, the deformation of the first end and the second end of the connecting spring 2 is relatively small, which can reduce the risk of virtual connection between the connecting spring 2 and the resistor rod 1 and the spark plug. In addition, the first end and the second end of this structural design are combined with the second section 202 in which the spiral gap is in a tight state, which can ensure the centering of the two ends and the middle position of the connecting spring 2 in the length direction, avoid the deflection of the connecting spring 2, and achieve a better overall centering effect.

[0046] See also Figure 1In this embodiment, the first end of the connecting spring 2 is embedded in the docking groove 301 of the second connecting cap 3 to realize the connection between the connecting spring 2 and the resistor rod 1, and the shape of the first end of the connecting spring 2 matches the shape of the docking groove 301, so that the first end of the connecting spring 2 can be installed in alignment with the docking groove 301, and it can be ensured that the first end of the connecting spring 2 will not produce a skewed virtual connection with the resistor rod 1 during the vibration absorption process, so that the first end of the connecting spring 2 and the resistor rod 1 are always kept in alignment, ensuring the reliability and stability of the connection between the resistor rod 1 and the connecting spring 2.

[0047] For example, see Figure 1 and Figure 2 In one example, the docking groove 301 is a cylindrical straight groove, the first end of the connecting spring 2 is a cylindrical structure adapted to the docking groove 301, and the diameter of the first end of the connecting spring 2 is equal to the diameter of the docking groove 301. In this way, when the first end of the connecting spring 2 is embedded in the docking groove 301, the outer side of the connecting spring 2 just abuts against the inner wall of the docking groove 301, and the inner wall of the docking groove 301 limits the connection spring 2, so that the connection spring 2 and the docking groove 301 can be ensured to be centered.

[0048] For further information, see Figure 1 In the example where the docking groove 301 is a cylindrical straight groove, the diameter of the first section 201 of the connecting spring 2 is greater than the diameter of the first end of the connecting spring 2, that is, the diameter of the first section 201 of the connecting spring 2 is greater than the diameter of the docking groove 301. In this configuration, since the diameter of the first section 201 of the connecting spring 2 is greater than the diameter of the docking groove 301, when the first section 201 of the connecting spring 2 completely squeezes the first end part into the docking groove 301, the second connecting cap 3 can limit the first section 201 to prevent the first section 201 from continuing to squeeze the first end in the docking groove 301 in the subsequent stage, thereby reducing the deformation degree of the first end of the connecting spring 2 and reducing the elastic force of the first end, thereby reducing the risk of virtual connection between the first end of the connecting spring 2 and the second connecting cap 3, and improving the connection reliability.

[0049] Furthermore, in some embodiments, a limiting structure for axially limiting the first end of the connecting spring 2 may be provided in the docking groove 301. For example, the limiting structure may be a threaded structure (not shown) provided on the inner wall of the docking groove 301, the threaded structure having about two turns of thread, and the pitch of the threaded structure is the same as the pitch of the first end of the connecting spring 2, so that the first end of the connecting spring 2 can be screwed into the threaded structure in the docking groove 301 in a spiral manner, and the first end of the connecting spring 2 is axially limited by the threaded structure, which can prevent the connecting spring 2 from being deviated due to engine vibration and improve the connection stability.

[0050] See also Figure 3 and Figure 4 In another example, the docking groove 301 is a flared groove, and the first end of the connecting spring 2 is a cone that matches the flared groove. In this way, when the first end of the connecting spring 2 is embedded in the docking groove 301, all parts of the first end of the connecting spring 2 along the length direction are in contact with the docking groove 301, ensuring the centering of the connecting spring 2 and the docking groove 301, and when the connecting spring 2 absorbs vibration, the deformation of the first end of the connecting spring 2 is also small, which can reduce the risk of virtual connection between the first end of the connecting spring 2 and the second connecting cap 3.

[0051] For further information, see Figure 4 In the example where the docking groove 301 is an expanded groove, the diameter of the first section 201 of the connecting spring 2 is larger than the diameter of the opening of the docking groove 301. Similarly, this structural design can also limit the first section 201 of the connecting spring 2 by the second connecting cap 3, so as to prevent the first section 201 of the connecting spring 2 from continuously squeezing the first end, reduce the deformation of the first end of the connecting spring 2, and reduce the risk of virtual connection between the first end of the connecting spring 2 and the second connecting cap 3.

[0052] join Figure 1 In this embodiment, the second end of the connecting spring 2 is flared. This configuration makes one end of the connecting spring 2 narrowed and the other end flared. Compared with both ends being narrowed, it can improve the connection stability of the connecting spring 2 and have a better buffering effect.

[0053] On the other hand, the utility model further provides an ignition coil, which includes the high-voltage connection structure of any of the above embodiments.

[0054] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A high-voltage connection structure for an ignition coil, the high-voltage connection structure is used to connect the high-voltage output terminal of the ignition coil and the spark plug of the engine, characterized in that: The high voltage connection structure comprises: A resistor rod (1), the resistor rod (1) having a first end for connecting to the high-voltage output terminal and a second end for connecting to a connecting spring (2), a second connecting cap (3) being provided on the second end of the resistor rod (1), and a docking groove (301) being provided at an end of the second connecting cap (3) away from the resistor rod (1); A connecting spring (2), wherein the first end of the connecting spring (2) is centrally installed in the docking groove (301), and the shape of the first end of the connecting spring (2) matches the shape of the docking groove (301), and the second end of the connecting spring (2) is used to connect to the spark plug.

2. The high voltage connection structure according to claim 1, characterized in that: The connecting spring (2) comprises a first section (201), a second section (202) and a third section (203) which are sequentially connected along a direction from the first end to the second end; The spiral gap of the second section (202) is in a tight state, and the diameter of the second section (202) is larger than the diameters of the first section (201) and the third section (203).

3. The high voltage connection structure according to claim 2, characterized in that: The pitch between the first end and the second end of the connecting spring (2) is smaller than the pitch between the first section (201) and the third section (203).

4. The high voltage connection structure according to claim 2, characterized in that: The docking groove (301) is a cylindrical straight groove, and the diameter of the first end of the connecting spring (2) is equal to the diameter of the docking groove (301).

5. The high voltage connection structure according to claim 4, characterized in that: The diameter of the first section (201) is greater than the diameter of the first end of the connecting spring (2).

6. The high voltage connection structure according to claim 2, characterized in that: The docking groove (301) is a flared groove, and the first end of the connecting spring (2) is a cone that matches the flared groove.

7. The high voltage connection structure according to claim 6, characterized in that: The diameter of the first section (201) is greater than the diameter of the opening of the docking groove (301).

8. The high voltage connection structure according to claim 6, characterized in that: The second end of the connecting spring (2) is in a flared shape.

9. The high voltage connection structure according to claim 7, characterized in that: A first connection cap (4) is provided at the first end of the resistor rod (1), and a slot for inserting the high-voltage output terminal is provided on a side of the first connection cap (4) away from the resistor rod (1).

10. An ignition coil, characterized in that: It comprises the high voltage connection structure as described in any one of claims 1 to 9.

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