JP3115491B2 - 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. 8 is a side sectional view showing a conventional ignition power distribution device disclosed in Japanese Utility Model Laid-Open No. 4-59371. In the figure, 1 is a base, 2 is a cap having a peripheral electrode 3 connected to a high-voltage cord connected to a spark plug (not shown) of each cylinder (not shown), and 4 is fixed to the base 1 by screws 14 The ignition coil 4 includes a primary coil, a secondary coil, and an iron core.

A shaft 5 is mounted on the base 1 and is rotated in synchronization with a crankshaft of the internal combustion engine.
A signal plate, which is fixed to the
Is a unit through which the shaft 5 penetrates. The unit 8 includes a crank angle sensor unit 81 that detects a crank shaft rotation angle in combination with the signal plate 6 and outputs crank rotation angle information to a control computer, A power transistor, which is a primary current interrupt for interrupting the primary current of the ignition coil 4 in response to a signal, and a control unit for controlling the operation of the power transistor are integrated.

A rotor 9 is fixed to the blank 7 and distributes a secondary high-voltage output to a predetermined spark plug in synchronization with the rotation of the crankshaft. Cover integrated with a shield plate to prevent noise generated by spark discharge of
Reference numeral 11 denotes a first interposed between the cap 2 and the unit 8.
Is a second seal interposed between the unit 8 and the ignition coil 4, and 13 is a third seal interposed between the ignition coil 4 and the base 1.

FIG. 9 is a plan view of FIG. 8, and FIG.
FIG. 15 is a plan view showing the unit 8. The unit connector 15 is a unit connector integrally formed with the unit 8. The unit connector 15 transmits a signal from a control computer to a control unit. And the driving voltage is applied to the power transistor 40. Reference numeral 16 denotes an ignition coil connector which is formed integrally with the case of the ignition coil 4 and connects the primary coil of the ignition coil 4 to an external power supply.

FIG. 11 is a plan view showing the ignition coil 4 of FIG. 8, and shows the male terminal 1 integrally formed with the case.
8 is connected to the female terminal 17 shown in FIG. 10, so that the primary coil and the power transistor 40 are electrically connected. The ignition coil connector 16 usually has an electrode 19 for supplying power to the primary coil, and a high voltage primary voltage which is connected to a junction between the power transistor 40 and the primary coil and is generated when the primary current is interrupted, to the tachometer. Electrode 20 is provided.

Further, since the primary voltage waveform is a high voltage and high frequency, the wiring from the primary coil to the tachometer is likely to be a noise source, which may adversely affect equipment such as a radio. Therefore, in order to suppress noise generated by the primary voltage, the electric resistor 4
1 may be provided.

In the above-described conventional ignition distributor for an internal combustion engine, when the shaft 5 rotates due to the rotation of the crankshaft of the internal combustion engine, the signal plate 6 integrally fixed thereto rotates. Each time the signal plate 6 passes through the crank angle sensor section 81, the light of the crank angle sensor section 81 is intermittent. As a result, the crank angle sensor 8
1 outputs crankshaft rotation angle information to a control computer.

The power transistor 40 interrupts the primary current of the ignition coil 4 in response to a signal from the control computer, and generates a secondary voltage in the ignition coil 4 at the ignition timing. This secondary voltage is sequentially distributed to the peripheral electrodes 3 as the rotor 9 rotates, the ignition plugs of each cylinder are sequentially ignited, and the internal combustion engine is continuously operated.

[0010]

In the conventional internal combustion engine ignition distributor constructed as described above, the unit 8
The connector 15 for the ignition coil and the connector 16 for the ignition coil are provided independently of each other. However, these connectors 15 and 16 for external connection need to ensure connection reliability, waterproofness, vibration resistance and the like. In addition, both the connector housing and the terminal are required to have high dimensional accuracy, and the terminal is required to be plated with gold, tin, or the like.

In particular, there are many types of connectors 15 and 16 depending on the use, the use environment and the like. However, in the conventional product, the connectors 15 and 16 are integrally formed with the unit case and the coil case. , 16, the structure of the mold of the case becomes complicated, the cost of the mold increases, and standardization cannot be achieved, thereby increasing the cost. Further, if the connectors 15 and 16 overlap with each other in a plan view, it is difficult to attach and detach the mating connector. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the coil case can be simplified by unifying the connector.
Accordingly, it is an object of the present invention to provide an internal combustion engine ignition distributor that can reduce costs and improve layout.

[0013]

According to a first aspect of the present invention, there is provided a power distribution device for an internal combustion engine, wherein an ignition coil and a unit are electrically connected to each other by terminals provided on the unit, and the same unit provided on the unit. In the connector, an ignition coil and a terminal for external connection of the unit are provided.

According to a second aspect of the present invention, there is provided an internal combustion engine ignition distributor, wherein a terminal on the unit side is formed of an elastic conductive material, and the terminal on the unit side is projected into a space provided in the unit. The terminal on the unit side and the terminal on the ignition coil side are pressed against each other.

In a third aspect of the present invention, there is provided an internal combustion engine ignition distributor in which an electric resistor for suppressing noise generated by a primary voltage of an ignition coil is provided in a unit.

[0016]

According to the first aspect of the present invention, the coil case is simplified by providing the external connection terminals of both the ignition coil and the unit in one connector.
Standardize and improve layout.

According to the second aspect of the present invention, the displacement of the terminals on the unit side and the ignition coil side in the height direction is absorbed by the elastic deformation of the terminals on the unit side.

According to the third aspect of the present invention, by providing an electric resistor for reducing noise in the unit, the coil case can be further simplified and the coil case can be standardized.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. Embodiment 1 FIG. FIG. 1 is a side sectional view showing an internal combustion engine ignition distributor according to Embodiment 1 of the present invention, FIG. 2 is a plan view of FIG.
1 is a plan view showing the unit shown in FIG. 1, and FIG. 4 is a plan view showing the ignition coil shown in FIG. 1. The same or corresponding parts as those in FIGS. 8 to 11 are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 4, the ignition coil 21 is provided with a primary terminal 28 for connecting the primary coil and the power transistor 40, and a power supply terminal 29 for supplying power to the primary coil. I have. As shown in FIG. 3, the unit 22 includes the ignition coil 2 described above.
A primary terminal 24 and a power supply terminal 25 connected to each of the terminals 28 and 29 are provided.

The periphery of each terminal 24, 25 of the unit 22 is surrounded by a molding material while maintaining a certain space distance, so that each terminal 24, 25 is not exposed to the outside of the distributor. The primary terminal 24 is connected to the power transistor 40. The other end 25a of the power supply terminal 25 is
The external connection connector 23 is provided integrally with the unit case.

When a primary voltage signal such as a tachometer is supplied, a primary terminal 26 is provided in the external connection connector 23, and this terminal is connected to the primary terminal 24 inside the unit 22.
Connected to. When it is necessary to reduce noise due to the primary voltage signal, an electric resistor 41 is connected between the primary terminals 24 and 26 as shown in FIG.

Next, FIG. 5 shows the above-mentioned ignition coil 2.
FIG. 6 is a detailed view showing a connection portion between the unit 1 and the unit 22, and FIG.
FIG. 6 is a sectional view taken along line VI-VI of FIG. The ignition coil 21 has a power terminal 29 connected to the primary coil.
Are insert-molded. The end of the power supply terminal 29
It has an eyeglass terminal shape, protrudes from the coil upper surface, and its surface is exposed from the mold surface. A nut 30 is insert-molded below the power supply terminal 29.

The power supply terminal 29 on the side of the ignition coil 21
The power supply terminal 25 on the side of the unit 22 connected to the power supply terminal also has a spectacle terminal shape, is formed of an elastic conductive material, and protrudes into a space surrounded by the mold. When the unit 22 is assembled on the ignition coil 21, the power terminals 25 and 29 have the same coordinate dimensions in plan view, and the back surface of the power terminal 25 and the front surface of the power terminal 29 in height. And the dimension settings match. Then, both are electrically and mechanically connected by the screw 31.

Another combination of terminals, that is, the connection structure of the primary terminals 24 and 28 is the same as described above.

However, in reality, the ignition coil 2
It is difficult to completely match the planar coordinate dimensions of the terminal on one side and the terminal on the unit 22 side, and the two sets of terminals may be displaced differently. Therefore, the hole diameter of the eyeglass terminal of the unit is set to be larger than the outer diameter of the end of the screw 31 by considering the amount of deviation and smaller than the washer diameter of the screw 31 so as to allow these deviations. I do.

Further, it is difficult to completely match the height of the terminal on the side of the ignition coil 21 with the back of the terminal on the side of the unit, so that the terminal on the side of the unit 22 is made of an elastic conductive material. Is formed, and by projecting the periphery of the terminal into the space without being constrained by a mold or the like, it is possible to absorb the amount of height difference between the two by elastic deformation of the terminal on the unit 22 side.

In the internal combustion engine ignition power distributor constructed as described above, the electrical connection between the ignition coil 21 and the outside can be made by connecting the external connection connector 23 of the unit 22 and the external wiring. This eliminates the need for the external connection connector, thereby simplifying and standardizing the coil case and improving the layout. In addition, since the electrical connection between the unit 22 and the ignition coil 21 is performed inside a sealed power distribution device, a simplified connection structure that does not require consideration of waterproofing, dustproofing, and the like is provided.

Further, by providing the noise reducing electric resistor 41 built in the ignition coil in the unit case, the standardization of the coil case can be simplified.

In the first embodiment, the optical type ignition power distribution device has been described. However, a Hall effect type power distribution device, a magnetic distribution device, or the like may be used.

Embodiment 2 FIG. Further, as shown in FIG. 7, the power distribution device may be configured such that the power distribution device outer wall is formed by the cap 2, the housing 44, and the sealing material 45, and the side walls of the unit 42 and the ignition coil 43 are not exposed to the outside. In this case, it is not necessary to surround the terminal portion 46 for connection with the ignition coil 43 of the unit 42 with a mold.

[0032]

As described above, in the internal combustion engine ignition distributor according to the first aspect of the present invention, the ignition coil and the unit are electrically connected to each other by the terminals provided respectively, and provided in the unit. Since the ignition coil and the external connection terminal of the unit are provided in the same connector, the connector for the ignition coil is not required,
As a result, the coil case can be simplified and standardized, so that the cost can be reduced and the layout can be improved.

According to a second aspect of the present invention, there is provided an ignition switch for an internal combustion engine, wherein the terminals on the unit side are formed of a conductive material having elasticity, and the terminals on the unit side are projected into a space provided in the unit. The terminal on the unit side and the terminal on the ignition coil side are brought into pressure contact with each other. , A simple connection structure with reduced considerations such as dust prevention can be adopted, the cost can be further reduced, and if the height of the ignition coil side terminal and the unit side terminal is misaligned, An effect is obtained such that the displacement can be absorbed by the elastic deformation of the terminal on the unit side.

Further, in the internal combustion engine ignition distributor according to the third aspect of the present invention, since the noise reducing electric resistor is provided in the unit, in addition to the same effect as the first aspect of the present invention,
There is an effect that the coil case can be further simplified and standardized.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an internal combustion engine ignition distributor according to Embodiment 1 of the present invention.

FIG. 2 is a plan view of FIG.

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

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

FIG. 5 is a detailed view showing a connection portion between the unit of FIG. 1 and an ignition coil.

6 is a sectional view taken along the line VI-VI in FIG. 5;

FIG. 7 is a side sectional view showing an internal combustion engine ignition distributor according to Embodiment 2 of the present invention.

FIG. 8 is a side sectional view showing an example of a conventional internal combustion engine ignition distributor.

FIG. 9 is a plan view of FIG. 8;

FIG. 10 is a plan view showing the unit of FIG. 8;

11 is a plan view showing the ignition coil of FIG.

[Explanation of symbols]

5 shaft, 21, 43 ignition coil, 2
2,42 units, 24,28 primary terminals, 25,2
9 power supply terminal, 23 external connection connector, 40 power transistor (primary current interrupting means), 26 primary terminal,
41 Electrical resistor, 81 Crank angle sensor unit.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-187869 (JP, A) JP-A-2-103913 (JP, A) JP-A-58-30774 (JP, U) JP-A-2-30869 119974 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F02P 7/00 F02P 7/067 301 F02P 15/00 301

Claims (3)

(57) [Claims] 1. A shaft that rotates in synchronization with a crankshaft of an internal combustion engine, an ignition coil that penetrates the shaft and generates a voltage to be distributed to each spark plug of the internal combustion engine, and a rotation of the crankshaft. A crank angle sensor unit for detecting an angle and outputting detection information to a control computer; a primary current interrupter for interrupting the primary current of the ignition coil in response to a signal from the control computer; and controlling the primary current interrupter. An internal combustion engine ignition power distribution device comprising a control unit and a unit stacked on the ignition coil, wherein the ignition coil and the unit are electrically connected to each other by terminals provided respectively. The ignition coil and the unit are installed in the same connector provided in the unit. And a terminal for external connection of the internal combustion engine. 2. A unit-side terminal is made of an elastic conductive material, and the unit-side terminal protrudes into a space provided in the unit, and the unit-side and ignition coil-side terminals are provided. The ignition switch according to claim 1, wherein the terminals are pressed against each other. 3. An internal combustion engine ignition distributor according to claim 1, wherein an electric resistor for suppressing noise generated by a primary voltage of the ignition coil is provided in the unit. .