JP2744752B2 - Switch for ignition of internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power distribution device for an ignition of an internal combustion engine in which a primary coil current of an ignition coil is interrupted by a primary current interrupting unit.

[0002]

2. Description of the Related Art FIG. 5 is a sectional side view showing an example of a conventional ignition power distribution device for an internal combustion engine. 1 is an aluminum housing, and 2 is a spark plug (not shown) of each cylinder (not shown). A cap 4 having a peripheral electrode 3 coupled to a high-voltage cord connected to the housing 1 and covering an opening of the housing 1 is an ignition coil disposed in the housing 1 and having a primary coil, a secondary coil and an iron core. ing. Reference numeral 5 denotes a shaft supported by the housing 1 and rotated in synchronization with a crankshaft (not shown) of the internal combustion engine. Reference numeral 6 denotes a signal plate fixed to the shaft 5 via a blank 7. The unit 8 includes a crank angle sensor unit 12 that detects a crankshaft rotation angle in combination with a signal plate 6 and outputs crank rotation angle information to a control computer. The power transistor, which is a primary current interrupting means for interrupting the primary coil current flowing through the ignition coil 4 according to the signal of the ignition coil 4, and a control unit for controlling the operation of the power transistor are integrated. Reference numeral 9 denotes a rotor which is fixed to the blank 7 and distributes a secondary high voltage output to a predetermined ignition plug in synchronization with rotation of the crankshaft. A cover 11 in which a shield plate for preventing generated noise is integrated, and 11 is a seal member interposed between the cap 2 and the housing 1.

In the internal combustion engine ignition distributor of the above construction, when the shaft 5 rotates due to the rotation of the crankshaft of the internal combustion engine, the signal plate 6 fixed integrally with the shaft also rotates and passes through the crank angle sensor unit 12. Every time the signal plate 6 interrupts the light of the crank angle sensor unit 12,
As a result, the crank angle sensor unit 12 outputs crankshaft rotation angle information to the control computer. The power transistor is an ignition coil 4 according to a signal from the control computer.
And the secondary current is generated in the ignition coil 4 at the ignition timing. This secondary voltage is sequentially distributed to the peripheral electrodes 3 with the rotation of the rotor 9, the ignition plugs of each cylinder are sequentially ignited, and the internal combustion engine is continuously operated.

[0004]

The conventional ignition switch of the internal combustion engine constructed as described above has a housing 1 for protecting the ignition coil 4 and the unit 8 from dust and water.
(Also, Japanese Patent Application Laid-Open No. 1-273877 discloses a configuration in which an ignition coil and a unit are housed in a housing.) And the size in the radial direction increases.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and can reduce the overall weight, reduce the size in the radial direction, and is easy to assemble. The main purpose is to obtain electric appliances.

[0006]

According to a first aspect of the present invention, there is provided a power distribution device for an internal combustion engine which includes an ignition coil, a unit, and the like.
When the shaft and the shaft are included by laminating the
In both cases, the side of the ignition coil housing and the unit
Side and the side of the cap are exposed.
Constituting the outer wall of the appliance, and wherein said unit and said base
Abutting the ignition coil
Provided at a position where the outer peripheral portion and the base come into contact with each other in a substantially circumferential shape
The base and the ignition coil are connected to each other.
It has an engaging portion that determines the relative position in the radial direction .

[0007]

According to the present invention, the conventional housing is eliminated, the weight and the radial dimension are reduced, and the ignition coil can be easily assembled to the base. In addition, the ignition coil, unit and
By stacking the cap and enclosing the shaft
The dustproofness of the shaft bearing can be ensured. Ma
Also, because the unit is in contact with the base,
Part of the heat is transmitted to the base, and is released from the base to the outside.
It is.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a plan view of a unit of FIG. 1, and FIG. 4 is a plan view of an ignition coil of FIG. The same or corresponding portions as in FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted.

In the drawing, reference numeral 20 denotes a base for bearing the shaft 5, and reference numeral 21 denotes an ignition coil through which the shaft 5 passes. The ignition coil 21 is wound around the iron core 22 and the iron core 22 in a casing as shown in FIG. And the housing is filled with an insulator. 23 is provided on the periphery of the ignition coil 21 so as to be integrally molded with the housing at intervals in the circumferential direction, and is provided with an iron core.
A bush located inside 22, a screw 24 that penetrates each bush 23 and is screwed to the base 20, 25 is formed on the outer periphery of the lower surface of the ignition coil 21 and fits with a step 26 of the base 20. Projection, 27 is an ignition coil
A connection portion of a secondary high voltage terminal protruding from an outer peripheral portion of the ignition coil 21 for sending a secondary high voltage of the ignition coil 21 to the cap 2, and a primary coil 28 of the ignition coil 21 is formed integrally with a housing of the ignition coil 21. And an ignition coil connector for connecting the power supply and an external power supply. Note that the step 26 and the projection 25 constitute an engagement portion.

Reference numeral 30 denotes a unit which is screwed together with the cover 10 and the cap 2 to the base 20 with screws 32. The unit 30 detects a crank angle at which a coil detects a crank shaft rotation angle and outputs crank rotation angle information to a control computer. The sensor unit 33 and, for example, an electronic circuit unit including electronic components such as a power transistor for intermittently supplying the primary coil current of the ignition coil 21 in response to a signal from the control computer and a control unit thereof are integrated. Also, cap 2
And the through-holes formed on the respective peripheral edges of the unit 30
The screw 32 passing through the hole allows the cap 2 and the unit 30
Are integrally fixed to the base 20 and
The cut 30 is in contact with the base 20. 34 is a first seal provided between the ignition coil 21 and the unit 30,
35 is a through hole for penetrating the connection part 27 of the secondary terminal formed on the outer periphery of the unit 30; 36 is a second seal provided between the cover 10 and the cap 2;
A unit connector for transmitting the signal from the control computer to the control unit and applying the drive voltage to the crank angle sensor unit 33 and the power transistor, and 38 is a female connector integrally formed with the unit 30 This unit terminal is a male ignition coil terminal that is integrally molded with the housing of the ignition coil 21.
By coupling with 39, the power transistor and the primary coil are electrically connected.

[0011] In the ignition power distribution device configured as described above, the conventional housing 1 is eliminated, and the weight and the radial dimension are reduced. That is, according to this embodiment,
If this is the case, as shown in FIG.
The outer peripheral surface in the illustrated lateral direction as a side surface portion and the side of the unit 30
The outer peripheral surface in the illustrated lateral direction as a surface portion and the side surface of the cap 2
As shown in the figure, the outer peripheral surface in the lateral direction is exposed
The outer wall of the distribution switch. A labyrinth seal structure is formed between the base 20 and the ignition coil 21 by a projection 25 and a step 26, and a first seal 34 is interposed between the ignition coil 21 and the unit 30. Further, a second seal 36 is interposed between the cover 10 and the cap 2, so that the waterproofness and dustproofness are not inferior to those of the related art having the housing 1.

Further, by fitting the projection 25 of the ignition coil 21 to the step 26 of the base 20, the ignition coil 21 is easily assembled to the base 20 and the relative positioning in the radial direction is performed. This prevents the ignition coil 21 from coming into contact with the shaft 5 and prevents the ignition coil 21 from being damaged by the shaft 5. In addition, when assembled, a labyrinth structure is formed between the step 26 and the projection 25, so that it has water resistance. In the above embodiment, the step 26 is formed on the base 20 and the protrusion 25 is formed on the ignition coil 21. However, the protrusion may be formed on the base and the step may be formed on the ignition coil.

[0013] Also, regarding the internal combustion engine ignition distributor,
Hall effect type or magnetic type may be used.

[0014]

As described above, according to the internal combustion engine ignition distributor of the present invention , the ignition coil
Layer, unit and cap, and
Section constitutes the outer wall of the distributor, so that the ignition
Ensure that the coil and unit are dustproof and waterproof.
Can be. In addition, the shaft is enclosed by this laminated member.
To ensure that the shaft bearings are dustproof.
Can be. Also, the unit is in contact with the base
The heat transferred from the ignition coil to the unit
Is the base from where the unit and the base are in contact.
And the base promotes heat dissipation.

Further, the ignition coil extends over substantially the entire circumference of the ignition coil.
As a result, the base and the ignition coil are engaged.
Ignition coil with large weight
Even when the internal combustion engine is
There is no worry about the position being shifted by anyone. Also this
In the engagement part, the outer peripheral part of the ignition coil and the base abut
Are provided in a substantially circular shape at the positions where
It is easy to decide and has water resistance.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a plan view of the unit in FIG. 1;

FIG. 4 is a plan view of the ignition coil of FIG. 1;

FIG. 5 is a side sectional view showing one example of a conventional internal combustion engine ignition distributor.

[Explanation of symbols]

 2 Cap 5 Shaft 20 Base 21 Ignition coil 22 Iron core 25 Projection (engagement) 26 Step (engagement) 30 Unit 33 Crank angle sensor

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-208166 (JP, A) JP-A-60-113069 (JP, A) JP-A-61-183473 (JP, U) JP-A-2 119976 (JP, U)

Claims (2)

(57) [Claims] 1. A base for supporting a shaft that rotates in synchronization with a crankshaft of an internal combustion engine, wherein the shaft penetrates and houses an iron core and a primary coil and a secondary coil wound around the iron core. An ignition coil, a unit in which a crank angle sensor unit for detecting a rotation angle of the crankshaft and an electronic circuit unit for receiving a signal from the crank angle sensor unit are integrated, and a rotor that rotates integrally with the shaft. A cap having a peripheral electrode facing the rotor and covering the rotor , wherein the ignition coil, the unit and the unit are provided on the base;
And the cap are sequentially laminated to enclose the shaft
Rutotomoni, wherein a side portion of the housing of the ignition coil, and a side portion of the unit, the side surface portion of the cap constitutes an outer wall of each exposed to a distributor, and the uni
The base is in contact with the base, and
A position where the outer peripheral portion of the ignition coil is in contact with the base.
An internal combustion engine ignition distributor, characterized in that it comprises an engagement portion for determining a mutually engage relative position in the radial direction and the base and the ignition coil provided substantially circumferentially location. 2. The cap and the unit are each
Through-holes are provided on the peripheral edge of the
Characterized by being integrally fixed to the base by
The ignition distributor according to claim 1, wherein