CN211422817U

CN211422817U - Ignition coil grounding structure

Info

Publication number: CN211422817U
Application number: CN201922343491.0U
Authority: CN
Inventors: 路兵; 俞京; 徐茂生
Original assignee: Chery Automobile Co Ltd
Current assignee: Chery Automobile Co Ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-09-04
Anticipated expiration: 2029-12-20

Abstract

The utility model relates to a car ignition coil technical field provides an ignition coil ground structure, include: the ignition coil comprises an ignition coil shell, a coil and an engine cover; the ignition coil shell is provided with a mounting hole, a bushing is accommodated in the mounting hole, the bushing is connected to the engine hood cover through a bolt, and the bolt penetrates through the bushing; the coil is arranged in the ignition coil shell, and one end of the coil is wound on the bushing; wherein the coil is electrically connected to the bushing, the bolt, and the engine cover in sequence. The utility model provides an ignition coil ground structure can make ignition coil's secondary ground connection more reliable, avoids producing the bad risk of ground connection to the setting of external ground wire has been reduced.

Description

Ignition coil grounding structure

Technical Field

The invention relates to the technical field of automobile ignition coils, in particular to an ignition coil grounding structure.

Background

The ignition system is one of the most important systems in the engine management system, and the core components of the ignition system are an ignition coil and a spark plug. The ignition coil converts primary low voltage into secondary high voltage by using the principle of a transformer, the high voltage is output from the secondary of the ignition coil and then is transmitted to a central electrode of a spark plug through a connecting rod of the ignition coil, the other path of the secondary of the ignition coil is connected with a spark plug shell through a cylinder cover of an engine, and the spark plug shell is connected with a side electrode (serving as a grounding end). Under the action of high voltage, the central electrode discharges to the side electrode to form an arc to ignite the mixed gas in the cylinder, so whether the secondary grounding of the ignition coil is reliable or not determines the stability of the ignition voltage release to a great extent.

In the related art, the secondary ground of the ignition coil is led out through a wire harness, and the ground pressing piece is fixed to the engine body nearby through a bolt, so that the secondary ground of the ignition coil is realized. Wherein close means that the secondary discharge loop is as short as possible.

In the process of implementing the invention, the inventor finds that the related art has at least the following problems: the secondary ground of the ignition coil is led out and externally connected to the engine body through the secondary wire harness, the risk of poor grounding of the secondary wire harness exists, and meanwhile, the ground wire is additionally arranged, so that the cost is not reduced.

Disclosure of Invention

The embodiment of the invention provides an ignition coil grounding structure, which can ensure that the secondary grounding of an ignition coil is more reliable, avoid the risk of poor grounding and reduce the arrangement of an external grounding wire. The specific technical scheme is as follows:

an ignition coil grounding structure comprises an ignition coil shell, a coil and an engine cover;

the ignition coil shell is provided with a mounting hole, a bushing is accommodated in the mounting hole, the bushing is connected to the engine hood cover through a bolt, and the bolt penetrates through the bushing;

the coil is arranged in the ignition coil shell, and one end of the coil is wound on the bushing;

wherein the coil is electrically connected to the bushing, the bolt, and the engine cover in this order.

In one implementation of the embodiment of the present application, the system further comprises a spark plug wellbore and a spark plug;

one end of the spark plug shaft is connected with the ignition coil shell, and the other end of the spark plug shaft is connected with the spark plug.

In an implementation manner of the embodiment of the application, an ignition coil connecting rod is further arranged inside the spark plug shaft.

In an implementation manner of the embodiment of the application, a spring is arranged inside the connecting rod of the ignition coil; one end of the spring is connected with the coil, and the other end of the spring is connected with the spark plug.

In one implementation of the embodiments of the present application, the spark plug is provided with a side electrode that is coupled to a cylinder head of the engine.

In one implementation of the embodiments of the present application, the engine cover is disposed outside a cylinder head of the engine, and the engine cover is coupled to the cylinder head of the engine.

In one implementation manner of the embodiment of the application, the ignition coil shell comprises a first shell, a second shell and a third shell which are sequentially connected;

an ignition coil plug is arranged on the first shell and used for controlling the state of the ignition coil;

the second shell is connected with the spark plug shaft;

the third housing is connected to the engine cover.

In one implementation of the embodiment of the present application, the second housing and the third housing are cylindrical;

the diameter of the second housing is larger than the diameter of the third housing.

In an implementation manner of the embodiment of the application, the second housing and the third housing are integrally formed.

In one implementation of the embodiment of the present application, the ignition coil housing is fixed to the mounting boss of the engine cover.

The beneficial effects of the embodiment of the application at least comprise:

the utility model provides an ignition coil ground structure, with the one end winding of solenoid to wearing to be equipped with the bush of bolt on, replaced the ground connection preforming among the traditional ignition coil ground structure, make ignition coil's secondary ground connection more reliable, avoid producing the bad risk of ground connection, compare with traditional ignition coil ground structure, reduced external ground wire's setting.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an ignition coil grounding structure according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of an ignition coil of a conventional external ignition module;

FIG. 3 is a schematic diagram of a conventional ignition coil with an ignition module built therein;

FIG. 4 is a schematic diagram of an ignition coil of another conventional internal ignition module;

FIG. 5 is a schematic diagram of an ignition coil of an external ignition module according to an embodiment of the present disclosure;

fig. 6 is a schematic diagram of an ignition coil with an internal ignition module according to an embodiment of the present application.

The reference numerals denote:

1. an ignition coil housing; 11. a first housing; 111. an ignition coil plug; 12. a second housing; 13. a third housing; 2. a coil; 3. an engine cover; 4. a bolt; 5. a bushing; 6. a spark plug wellbore; 7. an ignition coil connecting rod; 71. a spring; 8. a spark plug; 81. a side electrode; 82. a center electrode; 83 spark plug housing.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The application provides an ignition coil ground structure, as shown in fig. 1, including ignition coil casing 1, solenoid 2 and bonnet 3. The coil 2 is arranged inside the ignition coil housing 1, and the ignition coil housing 1 is used for protecting the coil.

The ignition coil case 1 is fixed to an engine cover 3 by bolts 4. In order to avoid damage to the ignition coil case 1 and the hood 3 when the bolts are installed, a bushing 5 is provided outside the bolt 4. Thus, the ignition coil housing 1 is provided with a mounting hole in which a bushing 5 is accommodated, the bushing 5 is connected to the engine hood 3 by a bolt 4, and the bolt 4 is inserted into the bushing 5. The outer diameter of the bush 5 is the same as the diameter of the mounting hole, and the inner diameter of the bush 5 is the same as the maximum diameter of the screw in the bolt 4.

One end (grounding end) of the coil 2 is wound on the bushing 5 through the inside of the ignition coil housing 1, and the coil 2 is electrically connected to the bushing 5, the bolt 4 and the engine cover 3 in sequence, so that secondary grounding of the coil 2 is realized.

In some embodiments of the present application, the coil package may include an iron core, a primary coil wound around the iron core, and a secondary coil wound around the outside of the primary coil, one end (ground end) of the secondary coil being wound around the bushing. Epoxy resin can be filled between the coil and the ignition coil shell for insulation packaging. The bushing, bolt and engine cover may be made of metal or other materials having conductive properties.

In the embodiment of the present application, the ignition coil grounding structure may further include a spark plug well 6 and a spark plug 8. One end of the spark plug shaft 6 is connected with the ignition coil housing 1, and the other end of the spark plug shaft 6 is connected with the spark plug 8. In some embodiments of the present application, a bolt connection may be used between the spark plug well 6 and the ignition coil housing 1. The spark plug well 6 and the spark plug 8 are in contact with each other. In other embodiments of the present application, a threaded connection may be used between the spark plug well 6 and the ignition coil housing 1 to facilitate replacement of the spark plug or ignition coil.

As shown in fig. 1, the spark plug 8 may be provided with a side electrode 81 and a center electrode 82, and the side electrode 81 is also a ground electrode. The center electrode 82 is connected to one end of a terminal screw (not shown) whose other end is connected to a terminal nut (not shown), which is provided in a spark plug case 83 (not shown). An ignition coil connecting rod 7 can be arranged inside the spark plug shaft 6, and the ignition coil connecting rod 7 can be connected with a spark plug 8. Specifically, the ignition coil extension bar 7 may be connected to a terminal screw of a spark plug 8.

One end (ground end) of the coil 2 is wound around the bushing 5, and the other end (high-voltage end) is connected to the spark plug 8. Specifically, the inside of the ignition coil connection rod 7 is further provided with a spring 71, one end of the spring 71 is connected to the coil 2, and the other end is connected to the spark plug 8, and the spring 71 electrically connects the coil 2 and the spark plug 8, so that the high voltage generated by the ignition coil is transmitted to the spark plug 8 through the spring 71. In some embodiments of the present application, the spark plug well 6 and the spark plug 8 are abutted against each other, so that the spring 71 can be slightly deformed during the running of the vehicle, and poor contact between the spring 71 and the spark plug 8 is avoided.

The side electrode 81 may be welded to the outside of the spark plug housing 83, and the spark plug 8 may be provided on a cylinder head (not shown) of the engine with its front end protruding toward the combustion chamber so that the side electrode 81 of the spark plug is connected to the cylinder head of the engine. The spark plug housing 83 may be threaded at the end connected to the side electrode 81 for connection to the engine cylinder head ground. The engine cover 3 may be arranged outside the cylinder head of the engine, the engine cover 3 being connected to the cylinder head of the engine so that the engine cover 3 and the cylinder head of the engine are co-grounded, the coil 2 being wound around the bush 5 between one end and the side electrode 81 of the spark plug 8 to form a circuit.

The ignition coil is a step-up transformer which converts the low voltage output by the storage battery or the generator into high voltage, and when the current passes through the primary coil, magnetic lines of force are generated on the iron core. When the current of the primary coil is cut off, the magnetic force lines of the iron core are changed, and the changed magnetic force lines generate induced voltage on the secondary coil. The high-voltage end of the secondary coil delivers the generated high-voltage current to the spark plug, sparking between the side and center electrodes of the spark plug, thereby generating an intense electric spark. In some embodiments of the present application, an insulator may be disposed between the terminal screw and the spark plug housing. The central electrode is connected with one end of the high-voltage end of the secondary coil, so that high-voltage current transmitted at high voltage is connected to the central electrode.

In the embodiment of the present application, the ignition coil case 1 includes a first case 11, a second case 12, and a third case 13, which are connected in this order. The first housing 11 is provided with an ignition coil plug 111, and the ignition coil plug 111 is used for controlling the state of an ignition coil.

The ignition coil receives an ignition signal sent by an Electronic Control Unit (ECU) of the automobile through an ignition module, and controls the ignition coil to automatically ignite. The main device in the ignition module is an IGBT (insulated gate Bipolar Transistor). The ignition module can be arranged inside the ignition coil (internal ignition module) or outside the ignition coil (external ignition module).

For the ignition coil of the traditional external ignition module, a three-way connector is arranged in an ignition coil plug, and the principle of the ignition coil of the traditional external ignition module is shown in fig. 2. Three joints in the ignition coil plug are respectively used for connecting a power line, a signal line and a grounding line. Wherein the power cord is used for connecting the power supply and the primary coil, so that the power supply supplies power to the ignition coil. The signal line is used for receiving an ignition signal sent by the ECU. The grounding wire is used for connecting the grounding end of the secondary coil to realize the secondary grounding of the ignition coil.

For a traditional ignition coil with a built-in ignition module, a three-way connector or a four-way connector is generally arranged in an ignition coil plug. The principle of the ignition coil of the conventional built-in ignition module of the three-way joint is shown in fig. 3. In fig. 3, three joints in the ignition coil plug are used for connecting a power line, a signal line and a ground line, respectively. Wherein, the power cord is used for connecting the power to the power is ignition coil and ignition module power supply. The signal line is used for receiving an ignition signal sent by the ECU and transmitting the ignition signal to an IGBT (ignition module). The grounding wire is used for connecting the secondary coil and the grounding end of the IGBT, and the secondary ground of the ignition coil and the module ground are in common ground.

The ignition coil principle of the conventional built-in ignition module of the four-way joint is shown in fig. 4. In fig. 4, four connectors in the ignition coil plug are respectively used for connecting a power line, a signal line and two grounding lines. Wherein, the power cord is used for connecting the power to the power is ignition coil and ignition module power supply. The signal line is used for receiving an ignition signal sent by the ECU and transmitting the ignition signal to the IGBT. And the two grounding wires are respectively used for connecting the secondary coil and the grounding end of the IGBT.

In some embodiments of the present application, the grounding end of the ignition coil of the external ignition module is wound on the bushing, and the principle of the ignition coil is shown in fig. 5. Two connectors are arranged in the ignition coil plug and are respectively used for connecting a power line and a signal line. Wherein, the power cord is used for connecting the power to the power is ignition coil power supply. The signal line is used for receiving an ignition signal sent by the ECU.

In other embodiments of the present application, the grounding terminal of the ignition coil of the built-in ignition module is wound on the bushing, and the principle of the ignition coil is shown in fig. 6. The ignition coil plug is provided with three joints which are respectively used for connecting a power line, a signal line and a grounding line. Wherein, the power cord is used for connecting the power to the power is ignition coil and ignition module power supply. The signal line is used for receiving an ignition signal sent by the ECU and transmitting the ignition signal to the IGBT. And the grounding wires are respectively used for connecting the grounding ends of the IGBTs.

The ignition module and the ignition coil are respectively grounded, the grounding end of the ignition module is not wound on the bushing through the inside of the ignition coil shell, the requirement on the volume of the ignition coil shell can be reduced, and meanwhile, the ignition module and the ECU are grounded together, so that the potential difference existing in a loop signal loop of the ignition module and the ECU is avoided, and the control precision is improved.

In the present embodiment, as shown in fig. 1, the second housing 12 may be connected to the spark plug well 6, and the third housing 13 may be connected to the engine cover 3. The diameter of the second housing 12 may be larger than the diameter of the third housing 13 so that the bolts 4 fix the third housing 13 to the hood 3. The hood 3 may be provided with a mounting boss (not shown) for mounting the ignition coil housing 1, and the ignition coil housing 1 may be fixed to the mounting boss of the hood 3. It will be appreciated that the diameter of the third housing 13 is less than the length of the bolt 4.

In some embodiments of the present application, the ignition coil plug 111 in the first case 11 may be inserted into the second case 12. The second casing 12 and the third casing 13 in the ignition coil casing 1 may be an integrally formed structure, or may be formed in other manners. The inside of ignition coil's second casing can also be provided with the locating piece that is used for fixed solenoid, can also be provided with the louvre on the outer wall of second casing.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. An ignition coil grounding structure, comprising: the ignition coil comprises an ignition coil shell (1), a solenoid (2) and an engine cover (3);

the ignition coil shell (1) is provided with a mounting hole, a bushing (5) is accommodated in the mounting hole, the bushing (5) is connected to the engine cover (3) through a bolt (4), and the bolt (4) penetrates through the bushing (5);

the coil (2) is arranged inside the ignition coil shell (1), and one end of the coil (2) is wound on the lining (5);

wherein the coil (2) is electrically connected to the bushing (5), the bolt (4) and the engine cover (3) in sequence.

2. The ignition coil grounding structure according to claim 1, further comprising a spark plug well (6) and a spark plug (8);

one end of the spark plug shaft (6) is connected with the ignition coil shell (1), and the other end of the spark plug shaft (6) is connected with the spark plug (8).

3. The ignition coil grounding structure according to claim 2, wherein an ignition coil extension rod (7) is further provided inside the spark plug bore (6).

4. An ignition coil grounding structure according to claim 3, characterized in that a spring (71) is provided inside the ignition coil extension bar (7);

one end of the spring (71) is connected with the solenoid (2), and the other end of the spring (71) is connected with the spark plug (8).

5. The ignition coil grounding structure according to claim 2, characterized in that a side electrode (81) is provided on the ignition plug (8), the side electrode (81) being connected to a cylinder head of an engine.

6. The ignition coil grounding structure according to claim 1, wherein the engine cover (3) is disposed outside a cylinder head of an engine, the engine cover (3) being connected to the cylinder head of the engine.

7. The ignition coil grounding structure according to claim 2, wherein the ignition coil case (1) includes a first case (11), a second case (12), and a third case (13) connected in this order;

an ignition coil plug (111) is arranged on the first shell (11), and the ignition coil plug (111) is used for controlling the state of an ignition coil;

the second shell (12) is connected with the spark plug well bore (6);

the third housing (13) is connected to the engine hood (3).

8. The ignition coil grounding structure according to claim 7, wherein said second case (12) and said third case (13) are cylindrical;

the diameter of the second housing (12) is larger than the diameter of the third housing (13).

9. The ignition coil grounding structure according to claim 7, wherein the second case (12) and the third case (13) are of an integrally molded structure.

10. The ignition coil grounding structure according to claim 1, wherein the ignition coil case (1) is fixed to a mounting boss of the engine cover (3).