Waterproof connecting structure of ignition coil

Abstract

The utility model discloses a waterproof connection structure of an ignition coil, which comprises an ignition coil body, a rubber sheath is sleeved at the bottom end of the ignition coil body in a sealing manner, a conductive spring is arranged in the rubber sheath, and the ignition coil body is fixedly mounted on an engine cylinder cover through a bolt. The engine cylinder cover is provided with an insertion hole used for allowing the rubber sheath to penetrate through, and a positioning ring is integrally formed in the position, close to the top end, of the outer wall of the rubber sheath. According to the utility model, dustproof and waterproof protection between the rubber sheath and the engine cylinder cover is realized through the arrangement of the sealing rib sheets, and water cannot flow backwards into the annular vent groove from the bottom end opening of the first vent hole under the action of gravity through the cooperation of the annular vent groove, the first vent hole and the second vent hole; during wading, air in the ventilation groove and the engine cylinder cover cannot be exhausted outwards due to the water pressure effect and is compressed, resistance generated by the compressed air prevents water from flowing backwards into the annular ventilation groove, and therefore waterproof protection is achieved, and the use effect is good.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, specifically a waterproof connection structure for an ignition coil. Background Technology

[0002] The ignition coil is a crucial component of the engine. It is responsible for converting the vehicle's low-voltage current into a high-voltage current to ignite the air-fuel mixture in the engine via the spark plug. The main function of the ignition coil's rubber sheath is to protect it from dust, dirt, and other potentially harmful substances. Traditional ignition coils mostly only have dustproof requirements, but new energy vehicles and SUVs, due to their high-voltage system characteristics, complex operating conditions (such as driving through water), and more stringent environmental adaptability requirements, have significantly increased the requirements for waterproof and dustproof ignition coils.

[0003] Currently, most ignition coils on the market achieve dust protection by connecting to the engine cylinder head via a rubber sleeve mounted on the coil body. The rubber sleeve contains a stainless steel wire spring that electrically connects to the spark plug. An interference fit between the rubber sleeve and the spark plug ceramic body provides high-voltage protection. Sealing ribs on the rubber sleeve have a radial interference fit with the engine cylinder head, and venting grooves on the sealing ribs have an axial interference fit with the engine cylinder head to meet dust and exhaust requirements. However, this structure cannot achieve waterproofing, thus failing to simultaneously meet both dust and water protection requirements. Therefore, we propose a waterproof connection structure for ignition coils. Utility Model Content

[0004] The purpose of this invention is to provide a waterproof connection structure for an ignition coil to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A waterproof connection structure for an ignition coil includes an ignition coil body. A rubber sheath is provided at the bottom of the ignition coil body, and a conductive spring is installed inside the rubber sheath. The ignition coil body is fixedly mounted on an engine cylinder head by bolts, and the engine cylinder head has an insertion hole for the rubber sheath to pass through. A positioning ring is integrally formed on the outer wall of the rubber sheath near its top. The portion of the rubber sheath below the positioning ring passes through the insertion hole. Multiple sealing ribs are integrally formed on the outer wall of the rubber sheath below the positioning ring. The top surface of the rubber sheath fits against the outer wall of the ignition coil body. An annular vent groove is formed on the top surface of the rubber sheath. A first vent hole and a second vent hole are provided through the rubber sheath. The top ends of both the first and second vent holes communicate with the annular vent groove. The bottom opening of the first vent hole is located above the positioning ring, and the sealing ribs are all located above the bottom opening of the second vent hole.

[0007] As a further embodiment of this utility model: the top surface of the rubber sheath is coated with waterproof sealant, and the top surface of the rubber sheath is bonded to the ignition coil body by the waterproof sealant.

[0008] As a further embodiment of this utility model: the top opening of the rubber sheath is interference-fitted onto the ignition coil body, and the bottom opening of the rubber sheath is interference-fitted onto the corresponding spark plug.

[0009] As a further embodiment of this utility model: the outer wall of the ignition coil body located inside the rubber sheath is integrally formed with a conical protrusion, and a mating groove is provided inside the rubber sheath at the corresponding position of the conical protrusion, and the conical protrusion and the mating groove are interference fit.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] This invention achieves dust and water protection between the rubber sleeve and the engine cylinder head through the setting of sealing prisms. The annular vent groove, the first vent hole, and the second vent hole work together to form a U-shaped vent groove. One end of this vent groove (i.e., the bottom opening of the first vent hole) is located on the outside of the engine cylinder head, while the other end (i.e., the bottom opening of the second vent hole) is located on the inside of the engine cylinder head. Due to gravity, water will not flow back into the annular vent groove from the bottom opening of the first vent hole. When wading through water, the air in the vent groove and the engine cylinder head cannot be discharged outwards due to water pressure and is compressed. The resistance generated by the compressed gas prevents water from flowing back into the annular vent groove, thus achieving waterproof protection and providing good performance. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a waterproof connection structure for an ignition coil.

[0013] Figure 2 This is an exploded schematic diagram of a waterproof connection structure for an ignition coil.

[0014] Figure 3 for Figure 1 Enlarged view of point A in the middle.

[0015] The components include: 1. Ignition coil body; 2. Conical protrusion; 3. Rubber sheath; 4. Positioning ring; 5. Sealing prism; 6. Fitting groove; 7. Annular vent groove; 8. First vent hole; 9. Second vent hole; and 10. Conductive spring. Detailed Implementation

[0016] 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 some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figures 1-3 In this embodiment of the present invention, a waterproof connection structure for an ignition coil includes an ignition coil body 1. A rubber sleeve 3 is sealed at the bottom of the ignition coil body 1. A conductive spring 10 is disposed inside the rubber sleeve 3, and the ignition coil body 1 supplies power to the corresponding spark plug through the conductive spring 10. The ignition coil body 1 is fixedly mounted on the engine cylinder head by bolts, and the engine cylinder head has an insertion hole for inserting the rubber sleeve 3. A positioning ring 4 is integrally formed on the outer wall of the rubber sleeve 3 near the top, and the rubber sleeve 3 is located below the positioning ring 4. All parts of the rubber sleeve 3 are inserted into the insertion hole. The outer wall of the rubber sleeve 3 located below the positioning ring 4 is integrally formed with multiple sealing ribs 5. The top surface of the rubber sleeve 3 is in contact with the outer wall of the ignition coil body 1. The top surface of the rubber sleeve 3 is provided with an annular vent groove 7. The rubber sleeve 3 is provided with a first vent hole 8 and a second vent hole 9. The top ends of the first vent hole 8 and the second vent hole 9 are connected to the annular vent groove 7. The bottom opening of the first vent hole 8 is located above the positioning ring 4. The sealing ribs 5 are all located above the bottom opening of the second vent hole 9.

[0018] By adopting the above-mentioned solution, this utility model assembles the ignition coil body 1, i.e., the rubber sleeve 3, onto the engine cylinder head. Through the setting of the sealing prism 5, dustproof and waterproof protection is achieved between the rubber sleeve 3 and the engine cylinder head. Through the cooperation of the annular vent groove 7, the first vent hole 8, and the second vent hole 9, a "U"-shaped vent groove can be formed. One end opening of the vent groove (i.e., the bottom opening of the first vent hole 8) is located on the outside of the engine cylinder head, while the other end opening of the vent groove (i.e., the bottom opening of the second vent hole 9) is located on the inside of the engine cylinder head. Due to gravity, water will not flow back into the annular vent groove 7 through the bottom opening of the first vent hole 8. When wading through water, the air in the vent groove and the engine cylinder head cannot be discharged outward due to water pressure and is compressed. The resistance generated by the compressed gas prevents water from flowing back into the annular vent groove 7, thereby achieving waterproof protection and providing good performance.

[0019] In one embodiment of this utility model, the top surface of the rubber sheath 3 is coated with waterproof sealant, and the top surface of the rubber sheath 3 is bonded to the ignition coil body 1 by the waterproof sealant.

[0020] The use of waterproof sealant ensures the airtight connection between the top of the rubber sheath 3 and the ignition coil body 1.

[0021] In one embodiment of this utility model, the top opening of the rubber sleeve 3 is interference-fitted onto the ignition coil body 1, and the bottom opening of the rubber sleeve 3 is interference-fitted onto the corresponding spark plug, thereby ensuring the sealing performance of the rubber sleeve 3 with the ignition coil body 1 and the spark plug.

[0022] Specific combination Figure 2 and Figure 3 In one embodiment of the present invention, the outer wall of the ignition coil body 1 located inside the rubber sheath 3 is integrally formed with a conical protrusion 2, and a mating groove 6 is provided inside the rubber sheath 3 at the corresponding position of the conical protrusion 2, and the conical protrusion 2 and the mating groove 6 are interference fit.

[0023] The cooperation between the conical protrusion 2 and the mating groove 6 can improve the reliability of the connection between the rubber sleeve 3 and the ignition coil body 1, making the connection strength between the two greater than the connection strength between the rubber sleeve 3 and the spark plug. Thus, when the rubber sleeve 3 is pulled out of the engine cylinder head through the ignition coil body 1, the rubber sleeve 3 can be detached from the spark plug.

[0024] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A waterproof connection structure for an ignition coil, characterized in that: The system includes an ignition coil body (1), the bottom of which is sealed with a rubber sleeve (3). A conductive spring (10) is installed inside the rubber sleeve (3). The ignition coil body (1) is fixedly mounted on the engine cylinder head by bolts. The engine cylinder head has a hole for inserting the rubber sleeve (3). A positioning ring (4) is integrally formed on the outer wall of the rubber sleeve (3) near the top. The part of the rubber sleeve (3) below the positioning ring (4) is inserted into the hole. The outer part of the rubber sleeve (3) below the positioning ring (4) is... The wall is integrally formed with multiple sealing prisms (5). The top surface of the rubber sleeve (3) is in contact with the outer wall of the ignition coil body (1). The top surface of the rubber sleeve (3) is provided with an annular vent groove (7). The rubber sleeve (3) is provided with a first vent hole (8) and a second vent hole (9). The top ends of the first vent hole (8) and the second vent hole (9) are connected to the annular vent groove (7). The bottom opening of the first vent hole (8) is located above the positioning ring (4). The sealing prisms (5) are all located above the bottom opening of the second vent hole (9).

2. The waterproof connection structure for an ignition coil according to claim 1, characterized in that: The top surface of the rubber sheath (3) is coated with waterproof sealant, and the top surface of the rubber sheath (3) is bonded to the ignition coil body (1) by the waterproof sealant.

3. The waterproof connection structure for an ignition coil according to claim 1, characterized in that: The top opening of the rubber sleeve (3) is interference-fitted onto the ignition coil body (1), and the bottom opening of the rubber sleeve (3) is interference-fitted onto the corresponding spark plug.

4. The waterproof connection structure for an ignition coil according to claim 3, characterized in that: The outer wall of the ignition coil body (1) located inside the rubber sheath (3) is integrally formed with a conical protrusion (2). A mating groove (6) is provided in the rubber sheath (3) at the corresponding position of the conical protrusion (2), and the conical protrusion (2) and the mating groove (6) are interference fit.

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