JPS5851415Y2 - Engine ignition power distributor - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an engine ignition power distributor that houses a transistor for switching on and off the ignition current in a power distribution case, and electrically shields the transistor and the power distribution rotor.

Conventionally, this type of engine ignition power distribution device (hereinafter simply referred to as a power distribution device) has been used.

), there was a so-called interrupter contact system in which the ignition-secondary current was switched on and off by the operation of the interrupter to generate a high voltage in the secondary coil.

However, with this system, the secondary generated voltage often decreases due to burnout, wear, or oxidation of the interrupter contacts.

For this reason, a so-called semi-transistor system has been proposed in which a transistor is combined with the conventional interrupter contact system.

In this semi-transistor system, most of the primary current does not flow through the interrupter contact, but the primary current is switched on and off by the switching action of the transistor.

The current flowing through the interrupter contact is only the base current of the transistor and is therefore much smaller than the primary current supplied to the ignition coil.

Furthermore, since the voltage when the interrupter contact is opened is extremely small and no arc occurs, burnout, wear, etc. of the interrupter contact can be reduced.

However, when combining transistors with a circuit breaker contact method, when installing the transistor in a power distribution case, it is necessary to provide an appropriate insulation distance between the transistor and the power distribution rotor that distributes high voltage to the spark plugs of each cylinder. There is.

This is because there is a large level difference between the dielectric strength of the transistor and the high voltage applied to the distribution rotor.
This is because the latter is 30Kv to 40Kv while V is 500v.

However, it is generally difficult to provide an insulating distance between the transistor and the power distribution rotor because the power distributor itself becomes large.

For this reason, it is conceivable to arrange an electrical shielding plate between the transistor and the power distribution rotor, but in the past, the only such means has been a configuration in which the shielding plate is attached to the power distribution case.

As described above, in the conventional work of attaching the shielding plate to the power distribution case, it was necessary to handle the power distribution case itself, and no improvement in work efficiency could be expected.

In particular, it is desired to incorporate the transistor into a circuit breaker contact type circuit breaker installed in existing vehicles and convert it to a semi-transistor type circuit, and attempts have been made to place the transistor in a power distribution case. .

In such a case, a shielding plate that electrically shields the transistor and the power distribution rotor may be used, but conventionally, when installing this shielding plate, processing, etc. that is necessary to attach the power distribution case is necessary. .

However, in general, considerable difficulty is expected in configuring the shielding plate to be attached to the power distribution case.

This invention was devised to eliminate this inconvenience, and it is possible to electrically shield the transistor and the power distribution rotor by simply providing a support plate for mounting the transistor and attaching a shield plate to the support plate. The present invention provides a novel engine ignition power distribution device that can perform the following functions.

Hereinafter, one embodiment of this invention will be described in detail based on the drawings.

In the figure, the above-mentioned semi-transistor system is shown.

In Figs. 1 and 2, 1 is a rotating shaft driven by an engine, 2 is a cam provided on this rotating shaft 1, 3 is a housing that supports the rotating shaft 1, and 4 is a conventional interrupter. It is fixed to the housing 3 using plywood.

Reference numeral 5 denotes a support base plate fixed on the base plate 4, the specific shape of which will be described later, but as shown in FIG. has been done.

Reference numeral 6 denotes a power transistor that opens and closes the ignition-following current by a switch operation, and is attached to the vertical portion 5b of the support base plate 5.

T is an interrupter fixed on the horizontal part 5a of the support base plate 5;
For example, the fixed contact 7a is fixed to the support base plate 5 side, and the movable side having the movable contact 7b is loosely fitted to the support shaft 7c.

This movable side is connected to the power transistor 60 base.

The current flowing through these contacts 7a and 7b is only a signal current for controlling the power transistor 6 on and off.

A shielding plate 8 is made of an insulating material and surrounds the power transistor 6 and the interrupter 7.

This specific configuration will be described later.

9 is a main body of a power distribution rotor attached to the tip of the rotating shaft 1; 10 is a power distribution electrode fixed to the main body 9 of the power distribution rotor;
Reference numeral 11 denotes a power distribution cap, which accommodates the support base plate 5, shielding plate 8, main body portion 9 of the power distribution rotor, etc. other than the above-mentioned casing 3, and engages with the casing 3.

12 is a central electrode part provided for connection to an ignition coil (not shown), 13 is a contactor provided in the central electrode part 12 and contacts the power distribution electrode 10, and 14 is a contactor provided to the engine's spark plug (not shown). This is a surrounding electrode provided for connection.

FIG. 3 is a perspective view showing the specific structure of the support base plate 5. As shown in FIG.

The horizontal part 5a of the support base plate 5 is provided with a rotary shaft hole 5c in the center of which the rotary shaft 1 is inserted, and two screw holes 5d and 5c are provided in FIG. Support shaft 7c shown
A support hole 5e is formed into which the support hole 5e is fitted.

The vertical portion 5b is provided with protrusions 5f and 5f on both sides, respectively, and four holes 5g for mounting the power transistor 6.

FIG. 4 is a perspective view showing a specific structure of the shielding plate 8. As shown in FIG.

This shielding plate consists of a flat part 8a and a cylindrical skirt part 8b, and a hole part 8c is provided in the center of the flat part 8a for inserting the lower part of the main body part 9 of the power distribution rotor, Recesses 8d, 8d are provided at two predetermined locations in the portion 8b.

Engagement holes 8e and 8e are formed in these four parts 8d and 8d, respectively, into which the protrusions 5f and 5f of the support base plate 5 are engaged.

Moreover, as shown in FIG. 4, four guide protrusions 8f are provided inside the flat part 8a, and two guide protrusions 8 facing each other are provided on the inside of the flat part 8a.
The distance t between f and 8f is set to such an extent that the thickness of the vertical portion 5b of the support base plate 5 allows insertion.

Furthermore, a support shaft 7 is provided inside the support portion 8a as shown in FIG.
A locking piece 8g is provided so as to lock at the tip of c.

Then, the power transistor 6 is attached to the vertical part 5b of the support base plate 5, and the support shaft 1c is fitted into the support hole 5e of the support base plate 5. 4.

At this time, the interrupter 7 is also attached to the support base plate 5. next,
The vertical portion 5b of the support base plate 5 is inserted between the guide projections 8f, 8f of the shielding plate 8, and the shielding plate 8 is supported on the vertical portion 5b by being guided by the guide projections 8f, 8f. .

At this time, the protrusions 5f, 5f of the vertical portion 5b are covered by the shielding plate 8.
are engaged with the engagement holes 8e and 8e, respectively.

On the other hand, a locking piece 8g provided on the flat portion 8a of the shielding plate 8 is locked to the tip of the support shaft 7c.

In this way, movement of the rotation shaft 1 of the shielding plate 8 in the radial force direction is suppressed by the respective locks between the guide protrusion 8f and the vertical portion 5b of the support base plate 5, as well as between the locking piece 8g and the support shaft 7e. With respect to the movement of the rotary shaft 1 in the axial force direction, the protrusions 5f, 5f of the support base plate 5 and the engagement hole 8e of the shielding plate 8,
The shielding plate 8 is suppressed by engaging with the shielding plate 8c.
is firmly supported by the support base plate 5.

Therefore, the flat portion 8a of the shielding plate 8 is interposed between the buff transistor 6 and the power distribution electrode 10 of the power distribution rotor, and these power transistors 6 and the power distribution electrode 10 can be electrically shielded.

In particular, when converting a circuit breaker contact type installed in existing vehicles to a semi-transistor type in which the power transistor 6 is incorporated into the housing 3 and the power distribution cap 11, the support stand is used as described above. A plate 5 and a shielding plate 8 are prepared, and the support base plate 5 on which the power transistor 6 is attached is attached to the base plate 4.
It can be easily converted by fixing it to the base and installing a shielding plate.

Nao, in the above-mentioned non-example, a semi-transistor system was explained, but this invention does not use the interrupter 7,
It is also possible to apply the circuit breaker 7 to a so-called full transistor system in which the interrupter 7 is further replaced with a transistor.

As explained above, the engine ignition power distribution device according to this invention is an engine ignition power device that is equipped with a power distribution rotor, a shielding plate that electrically shields the interrupter, and the transistor. Attach the above-mentioned horizontal part of the support base plate having a horizontal part and a vertical part to the support base plate, and install an interrupter on the horizontal part of this support base plate and a transistor on the vertical part, respectively, and install the vertical part of the support base plate on the back side of the above-mentioned shielding plate. A guide protrusion that is fitted to the upper end of the vertical part and a locking piece that is locked to the support shaft of the interrupter are provided, and the guide protrusion and the locking piece are fitted to the upper end of the vertical part and the support shaft to disconnect the interrupter. Since the structure is such that the shield plate surrounding the transistors and the transistors is electrically shielded from the power distribution rotor, the shield plate is not attached to the power distribution case itself as in the conventional case. Since there is no need for direct handling work, there is an advantage that the work becomes easier.

In particular, when converting a circuit breaker contact system that is simply installed on the market to, for example, a semi-transistor system in which the transistor is installed inside the power distribution case, it is necessary to attach the shielding plate to the support plate, etc. can be easily converted.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the engine ignition power distributor according to this invention, Fig. 2 is a sectional view taken along the line 11-■ in Fig. 1, and Fig. 2 is a detailed perspective view of the support base plate shown in FIG. 2, and FIG. 4 is a detailed perspective view of the shield plate shown in FIGS. 1 and 2. Note that the same reference numerals in the figures indicate the same or equivalent parts. 1... Rotating shaft, 2... Cam, 3... Housing, 4...
- Base plate, 5... Support base plate, 6... Power transistor, 7... Continuing device, 8... Shielding plate, 9... Main body of power distribution rotor, 10... Power distribution electrode, DESCRIPTION OF SYMBOLS 11... Power distribution cap, 12... Center electrode part, 13... Contactor, 14 ridge surrounding electrode, 15.16... Screw.

Claims (1)

[Scope of utility model registration request] An engine ignition power distribution device comprising a power distribution rotor, a transistor that opens and closes the ignition current by opening and closing operations, an interrupter for controlling on/off of the transistor, and a shielding plate that electrically shields the power distribution rotor and the transistor. At the same time, the above-mentioned horizontal part of the support base plate having a horizontal part and a vertical part is attached to the plywood fixed to the power distribution case, and an interrupter is attached to the horizontal part of this support base plate, and a transistor is attached to the vertical part, and the above-mentioned A guide protrusion that fits into the upper end of the vertical part of the support base plate and a locking piece that is engaged with a support shaft that supports the movable side of the interrupter are provided on the back surface of the shield plate, and this guide protrusion is connected to the The locking piece is fitted to the upper end of the vertical portion, and the locking piece is locked to the support shaft so that the interrupter and the transistor are electrically shielded from the power distribution rotor by the shielding plate that surrounds them. Features a power distribution device for engine ignition.