JP3867921B2 - Mounting structure for attaching an ignition coil for an internal combustion engine to an engine plug hole - Google Patents

Description

  The present invention relates to a mounting structure in which an internal combustion engine ignition coil is fixed to an inner surface of a plug hole of an engine via an ignition coil socket, and vibration on a connector side is removed.

  FIG. 3A is a plan view for explaining an ignition coil for an internal combustion engine in a conventional example, and FIG. 3A and 3B, the ignition coil 31 for an internal combustion engine includes at least a center iron core 33 and an outer ring iron core 34, a primary coil 35 and a secondary coil 36, and a power switch 37 in an insulating case 32. Has been.

  The insulating case 32 has an ignition coil attachment part 321 for attaching to an engine (not shown) at one end, an attachment hole 322 provided in the ignition coil attachment part 321, and the other end (the opposite side to one side). And a connector 38. In addition, a high voltage cylinder portion 323 that accommodates the high voltage terminal 39 is provided at the lower portion of the insulating case 32.

  FIG. 4 is a cross-sectional view for explaining a state where an ignition coil for an internal combustion engine in a conventional example is attached to the engine side. In FIG. 4, the internal combustion engine ignition coil 31 is attached to the inner surface of the plug hole 421 of the engine 42 via the ignition coil socket 41 and the cover 43.

  The ignition coil socket 41 houses the high-pressure cylinder portion 323 of the internal combustion engine ignition coil 31. The internal combustion engine ignition coil 31 is attached to the cover 43 using a fixing bolt 324 at an ignition coil attachment portion 321. The insulating case 32 of the ignition coil 31 for the internal combustion engine is attached to the upper portion of the cover 43 by a fixing bolt 324 at the ignition coil attachment portion 321.

  The ignition coil socket 41 is attached to a cover 43 having a hole connected to the plug hole 421 at the top. The cover 43 is attached to the engine 42 having the plug hole 421 by bolts 431.

  The internal combustion engine ignition coil 31 is connected to a spark plug 46 through a protector 44 and a spark plug socket 45 inside the plug hole 421. The spark plug 46 ignites an engine (not shown) by an ignition part 462 led out of the plug hole 421. The ignition coil for an internal combustion engine shown in FIGS. 3 and 4 is described in, for example, Japanese Patent Application Laid-Open Nos. 2000-331853 and 2001-196248.

JP 2000-331853 A JP2001196248

  The ignition coil 31 for an internal combustion engine shown in FIGS. 3 and 4 is provided with an ignition coil mounting portion 321 at one end and a connector 38 at the other end. The internal combustion engine ignition coil 31 is fixed as a cantilever by the ignition coil mounting portion 321. That is, in the internal combustion engine ignition coil 31, the connector 38 on the side not fixed by the ignition coil mounting portion 321 has vibration / amplitude several times that of the engine.

  The connector 38 which is the free end of the ignition coil 31 for the internal combustion engine may cause a contact failure such as a momentary interruption due to the vibration. Further, when the vibration amplitude of the connector 38 increases, a gap is formed between the plug hole 421 and the ignition coil socket 41 on the connector 38 side, and moisture or the like may enter.

  The present invention is for solving the above-described problems, and the fixing portion is also provided on the side opposite to the ignition coil mounting portion, that is, on the connector side so that the mounting of the ignition coil for the internal combustion engine does not become a cantilever. It is an object of the present invention to provide an attachment structure for mounting an ignition coil for an internal combustion engine, which suppresses vibration and amplitude of a connector, to a plug hole of the engine.

(First invention)
A mounting structure for attaching an ignition coil for an internal combustion engine of the first invention to a plug hole of an engine includes a primary coil and a secondary coil wound around a bobbin, and a center iron core that magnetically couples the primary coil and the secondary coil. And an outer ring core, a connector connected to a power source, a mounting portion fixed to an engine provided on the opposite side of the connector, and a high-voltage terminal for supplying a high voltage to the engine. An attachment structure in which an ignition coil is mounted in an engine plug hole via an ignition coil socket, and an engine-side rib provided on the connector side on the inner surface of the plug hole, and an ignition coil for the internal combustion engine An ignition coil side rib for an internal combustion engine provided on the outer peripheral surface of the ignition coil socket for receiving the high pressure side, Engine side ribs and removing the vibration of so as to fit to the ignition coil side rib for an internal combustion engine connector side.

(Second invention)
In the mounting structure for attaching the internal combustion engine ignition coil of the second invention to the plug hole of the engine, the engine side rib and the internal combustion engine ignition coil side rib are the inner peripheral surface of the plug hole or the outer peripheral surface of the socket for the ignition coil for the internal combustion engine. In the above, it is provided along the circumferential surface on the connector side, and the vibrations on the connector side are removed by fitting them together.

(Third invention)
In the mounting structure for attaching the ignition coil for an internal combustion engine of the third invention to the plug hole of the engine, a concave portion or a convex portion is formed on the engine side of the plug hole on the connector side, and the high pressure side of the ignition coil for the internal combustion engine On the outer peripheral surface of the ignition coil socket that receives the protrusion, a convex portion or a concave portion is provided, and the vibration on the connector side is removed by making the respective shapes fit with each other.

(Fourth invention)
In the mounting structure for attaching the ignition coil for an internal combustion engine of the fourth invention to the plug hole of the engine, the plug hole is made of a hard material, and the ignition coil socket is made of an elastic material. To do.

  According to the present invention, the ignition coil for the internal combustion engine is shaped so that the engine side rib fits into the internal combustion engine ignition coil side rib when being pushed into the plug hole. The vibration on the connector side which is fixed to the cantilever type by the coil mounting portion and becomes a free end can be removed.

  According to the present invention, the engine-side rib is provided on the inner peripheral surface of the plug hole, and the internal combustion engine ignition coil-side rib is provided on the outer peripheral surface of the internal combustion engine ignition coil socket, substantially along the circumferential surface. Therefore, the contact area between the two is increased, and vibrations on the connector side and entry of moisture and the like can be further reduced.

  According to the present invention, when the ignition coil for the internal combustion engine is attached to the plug hole of the engine, since the convex portion or the concave portion is provided instead of the engine side rib and the socket side rib, the convex portion and the concave portion are mutually connected. By fitting, the contact area increases, the mutual adhesion increases, and further, the vibration on the connector side and the intrusion of moisture and the like can be reduced.

  According to the present invention, the material of the plug hole is hard, and the material of the socket for the ignition coil is made elastic, so that the ribs or the convex portions and the concave portions can easily bite into each other, and vibration and moisture can be prevented from entering. .

(First invention)
In the mounting structure for attaching the ignition coil for an internal combustion engine to the plug hole of the engine according to the first aspect of the invention, the ignition coil for the internal combustion engine is attached inside the plug hole on the engine side via the socket for the ignition coil.

  The ignition coil for an internal combustion engine includes a primary coil and a secondary coil wound around a bobbin, a center iron core and an outer ring iron core that magnetically couple the primary coil and the secondary coil, and a connector connected to a power source. And an attachment portion fixed to the engine provided on the opposite side of the connector. That is, the internal combustion engine ignition coil is fixed to the engine as a cantilever only on the opposite side of the connector.

  A first aspect of the invention is an internal combustion engine ignition that prevents a water leak or the like by generating a gap due to a connection failure due to a momentary disconnection caused by vibration of the engine in the connector or a magnitude of amplitude based on vibration on the connector side. In this mounting structure, the coil is mounted in the plug hole of the engine via a socket for an ignition coil.

  On the inner surface of the plug hole, an engine-side rib is provided on the connector side away from a mounting portion fixed to the engine. An ignition coil side rib for the internal combustion engine is provided on the outer peripheral surface of the ignition coil socket that receives the high pressure side of the internal combustion engine ignition coil.

  When the internal combustion engine ignition coil is pushed into the plug hole, the engine-side rib is shaped to fit the internal combustion engine ignition coil-side rib, so that the mounting portion cantilevered The vibration on the connector side can be removed.

(Second invention)
In the mounting structure for attaching the ignition coil for the internal combustion engine of the second invention to the plug hole of the engine, the engine-side rib is formed, for example, substantially halfway along the connector-side circumferential surface of the plug hole. Further, the internal combustion engine ignition coil side rib is provided along a circumferential surface of the connector side outer peripheral surface of the internal combustion engine ignition coil socket. Since both the ribs have a larger contact area than the first invention, vibrations on the connector side and intrusion of moisture and the like can be further reduced.

(Third invention)
The mounting structure for attaching the internal combustion engine ignition coil of the third invention to the plug hole of the engine is provided with a convex portion or a concave portion instead of the rib. In the first invention and the second invention, the ribs are pressed against each other to prevent the vibration on the connector side, whereas in the third invention, the protrusion and the recess are fitted to each other so that the contact is made. As the area increases, the mutual adhesion increases, and further, the vibration on the connector side and the intrusion of moisture and the like can be reduced.

(Fourth invention)
In the fourth invention, the plug hole is made of a hard material, and the ignition coil socket is made of an elastic material. Can be prevented.

  FIG. 1 (a) is a cross-sectional view for explaining the attachment of the ignition coil for an internal combustion engine and the engine side according to the present invention, (b) is a cutaway view of a plug hole portion in the engine, and (c) is A of (a). FIG. The internal combustion engine ignition coil 11 includes at least a primary coil 12 and a secondary coil 13, a center iron core 14, an outer ring iron core 15, and a power switch SW housed in an insulating case 16.

  The insulating case 16 includes an ignition coil mounting portion 17 for mounting on one end to the engine, a mounting hole 171 provided in the ignition coil mounting portion 17, and a connector 18 on the other end (on the opposite side). Is provided. An ignition coil socket 19 is attached to the lower part of the insulating case 16.

  The internal combustion engine ignition coil 11 is mounted in a plug hole 21 of the engine 20 via an ignition coil socket 19. In the internal combustion engine ignition coil 11, the ignition coil attachment portion 17 is attached to the attachment hole 201 of the engine 20 by a fixing bolt 172.

  The plug hole 21 is provided with engine side ribs 212 on the inner peripheral surface thereof. Further, a socket-side rib 191 as shown in FIG. 1C is provided on the outer peripheral surface of the ignition coil socket 19. The socket-side rib 191 is engaged by getting over the engine-side rib 212 when the internal combustion engine ignition coil 11 is pushed in. The engine-side rib 212 and the socket-side rib 191 are provided on the side opposite to the ignition coil mounting portion 17 and on the connector 18 side.

  By making the material of the engine-side rib 212 hard and making the material of the ignition coil socket elastic, the attachment of both becomes strong, and together with the ignition coil attachment portion 17, Vibration can be stopped. Moreover, since the said attachment does not form a clearance gap between the inner side of the plug hole 21 and the outer side of the socket 19 for ignition coils, it can prevent penetration | invasion of a water | moisture content etc.

  FIG. 2 shows another embodiment of the present invention, and is a cutaway view for explaining ribs provided in a plug hole portion in an engine. In FIG. 2, the engine-side rib 222 is formed on the inner peripheral surface of the plug hole 21 over almost a half circumference. Further, a socket-side rib having a shape (not shown) corresponding to the engine-side rib 222 shown in FIG. 2 is provided on the outer peripheral surface of the ignition coil socket 19.

  When the internal combustion engine ignition coil 11 is pushed into the plug hole 21, the socket-side rib 191 gets over the engine-side rib 222 to engage with an area larger than that of the embodiment.

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to the said Example. The present invention can be modified in various ways without departing from the scope of the claims. The shape of the engine-side rib and the socket-side rib of the present invention can be changed in design as long as it can suppress unevenness and other connector vibrations.

  In the present invention, the shape of the ignition coil for the internal combustion engine and the engine side can be changed without departing from the matters described in the claims. Needless to say, the material used for the ignition coil for the internal combustion engine of the present invention may be a known or known material.

(A) is a cross-sectional view for explaining the attachment of the ignition coil for an internal combustion engine and the engine side according to the present invention, (B) is a cutaway view of a plug hole part in the engine, and (C) is an enlarged view of part A of (A). FIG. Example 1 FIG. 6 is a cutaway view for explaining a rib provided in a plug hole portion in an engine according to another embodiment of the present invention. (Example 2) (A) is a top view for demonstrating the internal combustion engine ignition coil in a prior art example, (b) is sectional drawing similarly. It is sectional drawing for demonstrating the state which attached the ignition coil for internal combustion engines in the prior art example to the engine side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Ignition coil for internal combustion engines 12 ... Primary coil 13 ... Secondary coil 14 ... Center iron core 15 ... Outer ring iron core 16 ... Insulation case 17 ... Ignition coil attachment part 171 ... Mounting hole 172 ... Fixing bolt 18 ... Connector 19 ... Ignition coil socket 191 ... Socket side rib 20 ... Engine 201 ... Mounting hole 21 ... Plug hole 212 ..Engine side ribs 222 ... Engine side ribs

Claims (4)

Provided on the opposite side of the connector, a primary coil and a secondary coil wound around a bobbin, a center core and an outer ring core that magnetically couple the primary coil and the secondary coil, a connector connected to a power source, and An internal combustion engine ignition coil comprising at least a mounting portion for fixing to the engine and a high voltage terminal for supplying a high voltage to the engine is mounted in the plug hole of the engine via the ignition coil socket In
An engine-side rib provided on the connector side on the inner surface of the plug hole; an ignition coil-side rib for an internal combustion engine provided on an outer peripheral surface of a socket for an ignition coil that receives the high-pressure side of the ignition coil for the internal combustion engine;
With
A mounting structure for attaching an internal combustion engine ignition coil to a plug hole of an engine, wherein the engine side rib is fitted to the internal combustion engine ignition coil side rib to remove vibration on the connector side.   The engine side rib and the internal combustion engine ignition coil side rib are provided along a circumferential surface on the connector side on the inner peripheral surface of the plug hole or the outer peripheral surface of the ignition coil socket for the internal combustion engine. The mounting structure for attaching the ignition coil for an internal combustion engine according to claim 1 to a plug hole of the engine according to claim 1, wherein vibration on the connector side is removed by combining.   A concave portion or a convex portion is formed on the engine side of the plug hole on the connector side, and a convex portion or a concave portion is provided on the outer peripheral surface of the ignition coil socket that receives the high pressure side of the ignition coil for the internal combustion engine. 3. The internal combustion engine ignition coil according to claim 1 or 2 is attached to a plug hole of an engine by removing vibrations on the connector side by making the respective shapes fit to each other. Mounting structure.   The internal combustion engine according to any one of claims 1 to 3, wherein the plug hole is made of a hard material, and the ignition coil socket is made of an elastic material. Mounting structure for attaching the ignition coil to the engine plug hole.

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