JP2527066Y2 - 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 an ignition switch for 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. Reference numeral 10 denotes a resin portion for preventing leakage from the high voltage distribution portion and spark discharge of the high voltage distribution portion. A cover in which a shield plate for preventing generated noise is integrated; 11, a seal member interposed between the cap 2 and the housing 1;
Reference numeral 17 denotes an opening formed on the side of the housing 1.

FIG. 6 is a plan view when the cap 2 of FIG. 5 is removed. Reference numeral 13 denotes a unit formed integrally with the unit 8 to transmit a signal from a control computer to the control unit, and further includes a crank angle sensor unit 12 and a power transistor. , A unit connector for applying the drive voltage thereto, 14 is an ignition coil connector fitted to the housing 1 via a seal 19, and 15 is a terminal for connecting the primary coil to an external power supply. .

In the internal combustion engine ignition distributor of the above construction, when the shaft 5 is rotated by the rotation of the crankshaft of the internal combustion engine, the signal plate 6 fixed integrally with the shaft is also rotated and passes through the crank angle sensor 12. Each time, the signal plate 6 interrupts the light of the crank angle sensor unit 12, and as a result, the crank angle sensor unit 12 outputs crankshaft rotation angle information to the control computer. The power transistor interrupts the primary current of the ignition coil 4 according to a signal from the control computer, and a secondary voltage 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.

[0005]

The conventional ignition distributor of the internal combustion engine constructed as described above has a housing 1 for dustproof and waterproofing the ignition coil 4 and the unit 8.
However, there is a problem that the weight of the housing 1 increases the overall weight and the size in the radial direction.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is an object of the present invention to provide an ignition switch for an internal combustion engine which can reduce the overall weight and the size in the radial direction. Aim.

[0007]

According to the present invention, there is provided a power distribution device for ignition of an internal combustion engine according to the present invention, in which the side surfaces of an ignition coil and a unit are exposed to the outside, and a cutout is formed in a seal.

[0008]

In the present invention, the conventional housing is eliminated, and the weight and the radial dimension are reduced. The harmful gas generated inside the cover through the notch is discharged to the outside.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 to 4 show one embodiment of the present invention. The same or corresponding parts as those in FIGS. 5 and 6 are denoted by the same reference numerals, and the description thereof will be omitted. In the figure, reference numeral 20 denotes a base for bearing the shaft 5, reference numeral 21 denotes an ignition coil through which the shaft 5 passes, and the ignition coil 21
An iron core and a coil wound around the iron core are housed in a housing, and the housing is filled with an insulator. Reference numeral 23 denotes a bush which is provided integrally with the housing at a peripheral portion of the ignition coil 21 at intervals in the circumferential direction and is located inside the iron core.
, And a screw that is screwed to the base 20,
Reference numeral 25 denotes a protrusion formed on the outer peripheral portion of the lower surface of the ignition coil 21 and fitted to the step portion 26 of the base 20. Reference numeral 27 protrudes from the outer peripheral portion of the ignition coil 21 to cap the secondary high voltage of the ignition coil 21. 28 is a connection part of the secondary high voltage terminal for sending to the ignition coil 2
An ignition coil connector for integrally connecting the primary side coil of the ignition coil 21 to an external power supply.

A unit 30 is screwed to the base 20 with screws 32 together with the cover 10 and the cap 2.
The unit 30 includes a crank angle sensor unit 33 for detecting a crankshaft rotation angle of a coil and outputting crank rotation angle information to a control computer, and a power transistor for interrupting a primary coil energizing current of the ignition coil 21 according to a signal from the control computer. And its control unit are integrated. 34 is the ignition coil 21 and the unit 30
And a first seal 35 provided between
A through-hole 36 is formed between the cover 10 and the cap 2 to penetrate the connection portion 27 of the secondary terminal formed on the outer peripheral portion of the second terminal. The second hole 36 has a shape shown by hatching in FIG.
Is a unit connector for transmitting a signal from the control computer to the control unit, and applying a drive voltage to the crank angle sensor unit 33 and the power transistor.
The power transistor and the primary coil are electrically connected to each other by connecting the unit terminal 38 with the male ignition coil terminal 39 integrally formed with the housing of the ignition coil 21. Connected to.

FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 2, wherein 40 is located between the cap 2 and the unit 30.
A part of the second seal 36 is a cutout part, which communicates with the inside of the cap 2 through the cutout part 40,
A harmful gas such as ozone generated by a spark discharge between the rotor 9 and the peripheral electrode 3 is released to the outside through the notch 40.

[0012] In the ignition power distribution device configured as described above, the conventional housing 1 is eliminated, and the weight and the size in the radial direction are reduced. The projection 25 and the step 2 are provided between the base 20 and the ignition coil 21.
6, a labyrinth seal structure, a first seal 34 is interposed between the ignition coil 21 and the unit 30, and a second seal 36 is interposed between the cover 10 and the cap 2. Interposed, housing 1
The waterproof and dustproof properties are not inferior to those of the prior art having the above. Further, the housing 1 is eliminated, the weight and the dimension in the radial direction are reduced, and the opening 17 formed in the conventional housing 1 is covered by the cutout portion 40 between the cap 2 and the unit 30 to remove ozone and the like. The harmful gas is released to the outside through the notch 40 as in the conventional case.

In the above embodiment, an optical power distribution device for an internal combustion engine has been described. However, a Hall effect type power distribution device or a magnetic power distribution device may be used.

[0014]

As described above, according to the internal combustion engine ignition distributor of the present invention, the conventional housing is eliminated, the weight and the radial dimension are reduced, and the harmful gas inside the cap is notched. This has the effect of being smoothly discharged to the outside through the portion.

[Brief description of the drawings]

FIG. 1 is a side sectional view taken along the line II of FIG. 2 showing one embodiment of the present invention.

FIG. 2 is a plan view showing a state where a cap of FIG. 1 is removed.

FIG. 3 is a cross-sectional view of a main part along a line III-III in FIG. 2;

FIG. 4 is a plan view of FIG. 1;

FIG. 5 is a side sectional view showing an example of a conventional internal combustion engine ignition distributor, taken along line VV of FIG. 6;

FIG. 6 is a plan sectional view showing a state where a cap of FIG. 5 is removed.

[Explanation of symbols]

 2 Cap 5 Shaft 20 Base 21 Ignition Coil 30 Unit 36 Second Seal 40 Notch

Continuation of the front page (56) References JP-A-55-64158 (JP, A) JP-A-62-131977 (JP, A) JP-A-62-168966 (JP, A) JP-A-2-81957 (JP) JP-A-3-149353 (JP, A) JP-A-61-48972 (JP, U) JP-A-62-203964 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A shaft which is supported by a base and is rotated in synchronization with a crankshaft of an internal combustion engine, a core penetrated by the shaft, a core in a housing, and a primary coil and a secondary coil wound around the core. An ignition coil configured to contain the insulator and filled in a housing, and a crank angle sensor unit that is stacked on the ignition coil, detects a rotation angle of the crank shaft, and outputs crank rotation angle information to a control computer. A unit in which primary current interrupting means for interrupting the primary coil energizing current of the ignition coil in accordance with a signal from the control computer and a control unit for controlling the operation of the primary current interrupting means are integrated; A cover for covering the unit with a seal interposed between the ignition coil and the unit. The internal combustion engine ignition characterized in that each side surface of the cap is exposed to the outside, and a cutout portion is formed in the seal, and the inside and the outside of the cap communicate with each other through the cutout portion. For power distribution.