JPH11351116A - Ignition coil device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent error assembly by forming an error assembly preventing projection in a part of a supporting cylinder and forming a through hole allowing passage of the projection in a bracket. SOLUTION: An ignition(IG) coil 12 is constructed with a coil main body 13 and a supporting cylinder 14 integrated to each other, and the tip part of the supporting cylinder 14 serves as a connection cylinder 15 connecting an ignition plug. A projection 17 is formed on the outer circumferential face of the connection cylinder 15 so as to provide a checking function in case of erroneous assembly. Below the projection 17, an eave 18 extending in the circumference direction is formed projectingly from the outer circumferential face of the connection cylinder 15. In addition, a seal ring 19 tightly touching the inner circumferential face of a plug hole formed in a cylinder head is formed on the outer circumference of the connection cylinder 15. In an IG coil mounting bracket 34, a through hole 40 allowing passage of the projection 17 is formed, and by means of the through hole 40, the assembly direction of the IG coil 12 is regulated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION As an ignition coil for an internal combustion engine, a coil body and a support cylinder are integrally formed.
Although many types in which the tip of the support cylinder is connected to an ignition plug are employed, the present invention belongs to the field of such an ignition coil and pays particular attention to the ease of assembly to the engine body. .

[0002]

2. Description of the Related Art In some cases, the dimensions and shape of a coil body or the electrical performance are completely the same, but only the length of a support cylinder is different. This example will be described with reference to FIGS. FIG. 7 shows a hood-type automobile, in which an engine body 1 is mounted on an engine room in an upright position as shown in the figure. The engine body 1 mainly includes a cylinder block 2, a cylinder head 3,
The front wheel 7 is driven through a transmission (not shown) and a differential device 6.

Incidentally, there is a case where the same engine body 1 as described above is slanted and mounted as shown in FIG. This is an arrangement adopted when mounted on a cab-over type car, and an engine is arranged below the floor panel 8. When slanting in this way, it is necessary to change the shape of the oil pan 5, the transmission 9, and the like. The case of FIG. 8 is of a front engine / rear drive type. Therefore, power is transmitted to the rear side of the drawing to drive the rear wheels. Reference numeral 10 denotes a driver's seat, and 11 denotes a side door.

As described above, when an engine having the same basic structure is mounted in an upright or slanted manner, various considerations are required for commonality of related parts. In such a relationship, the target component of the present invention is the above-described ignition coil device. That is, in the case as shown in FIG. 7, the length of the ignition coil 12 is given a standard length LL in consideration of, for example, assembling the engine body compactly or facilitating attachment and detachment. However, in the case as shown in FIG. 8, the length of the ignition coil 12 must be reduced in relation to the floor-panel 8, and therefore the length LS is given. The reason why the ignition coil requires two types of long and short types is typically the above-described example, but two types of lengths may be required due to other factors. The symbol LL means long length, and LS means short length.

[0005]

What is problematic here is that an ignition coil having a short length LS is incorrectly attached to the upright engine. In general, engines having the same basic structure are often assembled on a common line, so that an operator may erroneously attach the ignition coil 12 having the length LS to the engine shown in FIG. If there is such an erroneous assembly, the process proceeds to the next step without noticing that the support tube of the ignition coil has not reached the ignition plug, and the engine cannot be started, resulting in a defective product. JP-A-6-58 showing the prior art
Japanese Patent Publication No. 237 discloses a similar ignition coil, but does not even suggest that it relates to prevention of erroneous assembly. Further, when the support cylinder is inserted into the plug hole of the cylinder head, the inside of the plug hole is closed. Therefore, it has been generally adopted to provide a ventilation hole for communicating the closed room with the outside. However, no means has been conventionally devised for organically connecting the problem generated in the ventilation hole and the means for preventing erroneous assembly. The above publication does not disclose anything related to this.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems.
According to the first aspect of the present invention, the coil body and the support tube are integrally formed, and the tip of the support tube is a connection tube, and the connection tube is connected to the ignition plug. In the type obtained by fixing, a projection for preventing erroneous assembly is formed on a part of the support cylinder, and the through hole of the bracket is sized to allow the projection to pass. Features.
Therefore, when the support cylinder with the projection passes through the regular bracket through-hole, assembly is performed without any problem. However, when a support cylinder with a projection is erroneously inserted into a small bracket through-hole of another engine, the operator quickly notices that the projection has been caught around the through-hole, and erroneous assembly is prevented. A second aspect of the present invention is characterized in that, in the first aspect, the bracket of the internal combustion engine that is erroneously assembled has a through-hole having a size through which a protrusion cannot pass. Prevention prevents misassembly. According to a third aspect of the present invention, in the first aspect, the vent hole opened in the connection cylinder is opened at a position corresponding to the projection when viewed in the longitudinal direction of the connection cylinder, and the projection is upward or substantially upward when viewed in the vertical direction. The water flowing down along the outer peripheral surface of the support cylinder is deflected left and right by the protrusion, and is guided in a direction away from the vent hole. According to a fourth aspect of the present invention, in the third aspect, an eave is provided below the protrusion, and further, a flat portion is formed between the eave and the seal ring by cutting off an outer peripheral portion of the connection tube. A protruding portion is formed extending from below to near the eave in the longitudinal direction, and a vent hole is formed in a state penetrating the inside of the seal ring from the protruding portion. Therefore, the water flowing down along the outer peripheral surface of the support cylinder is deflected left and right by the protrusion as described above, and further guided in the circumferential direction of the support cylinder by the eaves, and further away from the ventilation hole. Led to. In addition, since the raised portion is brought closer to the center of the support cylinder by the installation of the flat portion, the vent hole is sufficiently covered with the projections and the eaves.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the embodiments shown in FIGS. The ignition coil 12 is equivalent to the above-described shorter length LS, and the coil body 13 and the support tube 14 are integrally formed. The tip of the support tube 14 is a connection tube 15, and the other ends are cylinders. The section 16 is provided. The coil body is accommodated in the coil body 13 and the outside thereof is covered with a synthetic resin material, thereby forming the coil body 13 as illustrated. The support tube 14 is also made of synthetic resin, while the connection tube 15 is made of rubber. It is appropriate to use rigid polypropylene for these synthetic resins, while
The rubber is suitably NBR or silicone rubber. In this specification, the side of the coil body 13 is referred to as “upper”, and the opposite side is referred to as “downward”.

A projection 17 is formed on the outer peripheral surface of the connection tube 15 so as to fulfill a function of being hooked when erroneously assembled. An eave 18 extending in the circumferential direction below the projection 17 is formed so as to protrude from the outer peripheral surface of the connection tube 15. Seal ring 19 which is in close contact with the inner peripheral surface of a plug hole described later.
Are formed on the outer periphery of the connection tube 15. A flat portion 20 is provided between the eaves 18 and the seal ring 19 in a state in which the outer peripheral surface of the connection tube 15 is cut off, and a raised portion 21 is provided from the seal ring 19 side, that is, from below, to the vicinity of the eaves 18 in the longitudinal direction. Are formed. A vent hole 22 is formed in a state penetrating from inside the seal ring 19 from the protruding portion 21, and one side has an opening 23 below the lower seal ring 19, and the other side has the opening 23. An opening 24 is provided on the end face. The ventilation hole 22 is opened at a position having a positional relationship corresponding to the projection 17 when viewed in the longitudinal direction of the connection tube 15.

An engagement ring 25 is formed at the end of the tube portion 16 and elastically matches the connection tube 15 as shown in FIG. A fixing piece 26 is projected from the coil body 13, and the fixing piece 26 is installed with a 180-degree angular phase change from the projection 17. Reference numeral 27 denotes a socket hole into which a wiring coupler is inserted. Further, a coil spring 29 is attached to the cup-shaped metal terminal 28 fixed in the cylindrical portion 16.
Is inserted at one end, and the other end is pressed against the upper end of the ignition plug to achieve electrical conduction.

According to FIG. 3, an ignition coil 1
2 is attached to the engine. It should be noted that small structural parts such as the eaves 18 are not shown in FIG. This partially shows a slanted state as shown in FIG. 8, in which the connecting cylinder 15 is elastically pushed into the plug hole 31 opened in the cylinder head 30. An ignition plug 32 is screwed into the bottom of the plug hole 31, and a coil spring 29 is pressed against the tip. By pushing the connecting tube 15 in this way, a closed space 33 is formed, and a vent hole 22 (not shown in FIG. 3) is opened to allow the closed space 33 to communicate with the outside. In the figure, the support cylinder 14 is attached to the engine in a posture inclined at about 45 degrees with respect to the vertical line.

The bracket 34 is made of a steel plate and is arranged in a bridge shape in the longitudinal direction of the cylinder head 30.
That is, the both sides of the band-shaped substrate 35 are bent to form the leg portions 36.
Is formed in a curved state, and its tip is bent to form a mounting piece 37. The mounting piece 37 is aligned with the lateral side surface of the cylinder head 30 and is fixed with bolts 39. Reference numeral 38 denotes a hole into which a bolt 39 is inserted. Substrate 3
Numeral 5 indicates that the number of cylinders increases as the number of cylinders increases. FIG. 4 shows only one cylinder. Through hole 4 in substrate 35
0 is cleared, and the size is set so that the projection 17 can pass through, as is apparent from FIG. In this case, the through hole 40 is oval, and the projecting plate 41 extends in the long axis direction.
A hole 42 is drilled at the center of the hole, and a projection nut 43 is welded to the rear side of the veneer plate 41 so as to match the hole 42. Reference numeral 44 denotes an intake pipe.

The ignition coil 12 is passed through the hole 40 and inserted into the plug hole 31 as shown in FIGS. 3 and 6, and the fixing piece 26 is aligned with the hole 42 and fixed with the bolt 45 as shown in FIG. In this way, the connecting cylinder 15 is
2 and this coupling state is obtained by fixing the coil body 13 to the bracket 34. What is important here is that, when the ignition coil 12 is mounted in an inclined posture as shown in FIG. 3, the projection 17 is set so as to be located above or almost above when viewed in the vertical direction. In order to set such a direction,
The through hole 40 is made oval and a hole 42 is made in the direction of its long axis,
The orientation shown in FIG. 5 and the matching between the fixing piece 26 and the hole 42 are required.

On the other hand, in the case of another engine, for example, the one shown in FIG. 7, it is necessary to select the size and shape of the through hole as shown in FIG. . By doing so, the length LS
Of the ignition coil 12 cannot be assembled to the engine of FIG.

The operation of the embodiment described above will be described. The erroneous assembly is prevented by the function of preventing passage by the projection 17 as described above. On the other hand, water dripping on the floor panel during running or car washing flows down in a flow path as shown in FIG. The water flowing down the surface of the support cylinder 14 is a projection 17
, It is distributed to the left and right and is kept away from the opening 24. Further, when the water flows down to the eaves 18, the water flows along the eaves 18 in the circumferential direction of the support tube 14, and further flows further away from the opening 24. Then, the raised portion 21 is sealed.
Since it extends upward from the ring 19 to the vicinity of the eaves 18 and is raised on the plane portion 20, the ventilation holes 22 are biased toward the center of the support tube 14 and are sufficiently covered with the eaves 18. The approach of water to the opening 24 is prevented.

[0015]

According to the invention of the present application, since the projection for preventing erroneous assembly is caught in the wrong through hole of the bracket of the engine, the operator quickly notices that the mistake is made,
It is possible to prevent the above-mentioned defective product from flowing to a subsequent process. And since the correct engine bracket has a through hole large enough to allow the projection to pass through, the operator can prevent incorrect assembly by simple work without using nerves for special discrimination You can. Since the ventilation hole opened in the connection tube is opened at a position corresponding to the protrusion when viewed in the longitudinal direction of the connection tube, and since the protrusion is directed upward or almost upward when viewed in the vertical direction, water is projected by the protrusion. The flowing direction is changed so as to be guided in a direction away from the ventilation hole, so that leakage does not occur due to intrusion of water from the ventilation hole. Further, when the water whose flow direction has been changed by the protrusion reaches the eaves, the water is guided in the circumferential direction by the eaves, and further moves away from the ventilation hole, so that water can be prevented from entering the ventilation hole. Then, a raised portion is provided on the flat part installed in the notched state, and the ventilation hole is opened there.Since the ventilation hole is close to the center side of the support cylinder, the opening is an eaves. It will be well covered and therefore favorable for water blocking.

[Brief description of the drawings]

FIG. 1, showing an embodiment of the present invention, is a three-dimensional view of an ignition coil.

FIG. 2 is a partial longitudinal sectional side view of an ignition coil.

FIG. 3 is a side view showing a state where an ignition coil is attached to an engine.

FIG. 4 is a perspective view of a bracket.

FIG. 5 is a plan view showing a through hole portion.

FIG. 6 is a plan view showing a flowing state of water.

FIG. 7 is a simplified side view showing a mounting type of an engine.

FIG. 8 is a simplified side view showing a mounting type of another engine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 13 Coil main body 14 Support cylinder 15 Connection cylinder 32 Spark plug 34 Bracket 17 Projection 40 Through hole 22 Vent hole 18 Eave 19 Seal ring 20 Flat part 21 Ridge part

Claims (4)

[Claims] 1. A coil body and a support cylinder are integrally formed,
In the type in which the tip of the support cylinder is a connection cylinder, the connection cylinder is connected to the ignition plug, and the connection state is obtained by fixing the coil body to the bracket, a part of the support cylinder is used. An ignition coil device for an internal combustion engine, wherein a projection for preventing erroneous assembly is formed, and a through hole of the bracket is sized to allow the projection to pass through. 2. The ignition coil device for an internal combustion engine according to claim 1, wherein the bracket of the internal combustion engine which is erroneously assembled has a through hole having a size through which a projection cannot pass. 3. The connection cylinder according to claim 1, wherein the ventilation hole formed in the connection cylinder is opened at a position corresponding to the projection when viewed in the longitudinal direction of the connection cylinder, and the projection is positioned upward or substantially upward when viewed in the vertical direction. An ignition coil device for an internal combustion engine, wherein the ignition coil device includes: 4. The connecting part according to claim 3, wherein an eave is provided below the projection, and a flat part is formed between the eave and the seal ring by cutting off the outer peripheral part of the connecting cylinder. An ignition coil device for an internal combustion engine, characterized in that a raised portion extending from below to near the eaves is formed in the direction, and a ventilation hole is opened from the raised portion so as to penetrate the inside of the seal ring.