JPS5933904Y2 - internal combustion engine ignition system - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an internal combustion engine ignition device using a semiconductor element.

In this type of conventional device, the semiconductor element that directly interrupts the primary current flowing through the ignition coil generates heat. Therefore, as shown in FIG. Alternatively, as shown in FIG. 2, the power distributor main body housing 3 is used as a heat dissipating member, and the semiconductor element 4 is attached to the seat surface 33 protruding from the outer periphery of the housing 3.

However, when the heat dissipation member is attached to the chassis of the vehicle as shown in FIG. 1, the wiring to the power distribution device in which the signal generator is installed becomes complicated, and there is a drawback that large amounts of noise from ignition sparks and the like enter the heat dissipation member.

In addition, in recent years, the number of equipment, wiring, and piping for exhaust gas countermeasures has increased, and the space around power distributors has become smaller, making it difficult due to the layout to mount semiconductor devices on the protruding parts of power distributors as shown in Figure 2. Furthermore, if the semiconductor amplifying element is exposed in the engine room, it has the disadvantage that it may leak due to contamination with oil or the like, causing malfunction.

The present invention provides an internal combustion engine ignition system that can overcome the above-mentioned drawbacks.

The embodiment shown in FIG. 3 will be described below.

In FIG. 3, 10 is an aluminum alloy housing, 11 is a cap of the housing 10, 12 is a main electrode that holds a high voltage cord connected to an ignition coil (not shown) and is integrally molded with the cap 11, and 13 is not shown. Supports the high pressure cord connected to the spark plug of each cylinder of the engine,
A distribution electrode integrally formed with the cap 11, 14 an insulating plate, 15 a heat sink supporting the semiconductor element 16, 11
is fitted into the inner diameter of the housing 10, and the washer 18
a fixing plate made of aluminum alloy that is fixed to the housing 10 by the screw 19 through the screw 19 and partitions the space formed by the housing 10 and the cap 11 into two upper and lower chambers;
20 is molded integrally with the fixing plate 17, and
A mounting plate 21 is made of an aluminum alloy and extends perpendicularly to the upper chamber side from the base and has a seating surface for mounting the heat sink 15, and fixes the heat sink 15 to the mounting plate 20 via the insulating plate 14. A signal generator (hereinafter referred to as an interrupter) 23 is arranged on the side opposite to the side where the semiconductor element 16 is arranged and is composed of an interrupter that generates an ignition signal.
a movable base plate to which the above-mentioned connector 22 is fixed, is rotatably supported by the fixed plate 17, and is connected to a vacuum advance device (not shown) that controls the ignition signal generation timing according to the load condition of the engine; Reference numeral 24 indicates a lever for regulating the movement of the movable base plate in the thrust direction, and reference numeral 25 indicates a rotating shaft that is driven by an internal combustion engine (not shown) to drive the interrupter 22 and is supported by the housing 10.

In the above configuration, the semiconductor element 16 and the interrupter 22
, an ignition coil (not shown) is connected by a lead wire (not shown).

With this configuration, the heat generated in the semiconductor element 16 is dissipated from the mounting base 20 to the fixed plate 1T through the insulating plate 14, and is further diffused to the housing having a large heat capacity, so that the temperature rise of the semiconductor element 16 is minimized. This prevents damage caused by heat.

In addition, by housing the semiconductor element 16 in the power distribution device, the wiring distance from the interrupter 22 to the semiconductor element 16 is shortened, and stable ignition operation is obtained without intrusion of noise caused by ignition sparks. Assembly is also easier.

Furthermore, there is no need to change the layout around the power distribution device, and leaks due to dirt such as oil in the engine compartment can be prevented.

In addition, this devised device attaches the semiconductor element that directly interrupts the primary current flowing to the ignition coil to a fixed plate made of aluminum alloy with high thermal conductivity that partitions the inside of the power distribution device into two upper and lower chambers, thereby reducing the amount of current generated in the semiconductor element. Heat can be diffused into the housing through the fixed plate to prevent thermal damage to the semiconductor element, and the fixed plate supports the movable plate on which the signal generator is attached, and the semiconductor element is mounted on the mounting plate that is integrated with the fixed plate. Since it is fixed, the wiring between the signal generator and the semiconductor element is not complicated, and the advance angle movement of the movable base plate becomes smooth.

This prevents leaks from entering the casing, such as oil and muddy water, and since the wiring is short, it also prevents ignition sparks from entering.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing how a semiconductor element is mounted in a conventional device, and FIG. 2 is a side view showing how a semiconductor device is mounted on another side of the conventional device. FIG. 3 is a sectional view showing an embodiment of this invention. In the figure, 23 is a movable base plate, 22 is a signal generator, 16 is a semiconductor element, and 17 is a fixed plate.

Claims (1)

[Scope of utility model registration request] A housing made of aluminum alloy or a metal material with at least as good thermal conductivity as this, a cap that covers the upper opening of the housing, and an aluminum alloy that partitions the space formed by the housing and the cap into two upper and lower chambers. A fixed plate, a movable base plate rotatably supported on the fixed plate that displaces according to the load of the engine, and a movable base plate that is attached to this movable base plate and generates an ignition signal at a timing corresponding to the ignition timing of the engine. a signal generator, a mounting plate formed integrally with the fixed plate and extending perpendicularly from the fixed plate on the side opposite to the side where the signal generator is arranged; An internal combustion engine ignition device equipped with a semiconductor element that directly interrupts the flowing primary current.