JPS6133238Y2 - - Google Patents

Description

[Detailed description of the invention] The invention uses a hybrid integrated circuit to control the heating coil of an electric heating autochoke device installed in a two-barrel carburetor installed in an internal combustion engine such as an automobile. The present invention relates to a control device for a vaporizer.

In the prior art, a hybrid integrated circuit housed in an aluminum case is screwed to the carburetor using a belt or the like. This prior art requires a large number of parts, which increases the number of assembly steps, increases the cost, and reduces vibration resistance. Moreover, when mounting a hybrid integrated circuit, there is a demand for it to be as small and lightweight as possible.

The purpose of this invention is to solve these technical problems all at once, and it has a simple configuration and requires only a few assembly steps, which reduces the cost accordingly and makes it possible to reduce the size and weight. It is an object of the present invention to provide a control device for a vaporizer that can be used.

The present invention houses a diaphragm that drives a secondary throttle valve provided in connection with a two-barrel carburetor, and covers a diaphragm chamber attached to the carburetor with a metal diaphragm cover. A recess is integrally formed at the top of the recess, and an electronic circuit element is formed on the inner wall of the recess to control a heating coil for heating a bimetal for driving a chuck valve included in an electrothermal autochoke device. This control device for a vaporizer is characterized in that a ceramic substrate is fixed and a filler is filled in the recess to form a hybrid integrated circuit.

FIG. 1 is an overall system diagram of an embodiment of the present invention. An electrothermal auto-choke device 3 is attached to a chock valve 2 of a two-barrel carburetor 1 for an internal combustion engine. In the primary flow path 4, a primary throttle valve 5 is provided below the choke valve 2. A secondary throttle valve, which is not shown in FIG. 1, is interposed in the secondary flow path, and the opening and closing of this secondary throttle valve is driven by a diaphragm that responds by using the negative pressure of the bench lily. . The diaphragm is housed in a diaphragm chamber 6 that is fixed to the carburetor 1. This diaphragm chamber 6 is covered by a metal diaphragm cover 7.

Immediately after the internal combustion engine starts, the electrothermal auto-choke device 3 suppresses the opening of the chiro-yoke valve 2 by the spring action of the spiral bimetal. When the internal combustion engine starts, current flows through the heating coil and the spiral bimetal opens. It is heated and the chiyoke valve 2 is fully opened. The power supplied from the battery 8 to the heating coil via the ignition coil 9 and regulator 10 is supplied by a hybrid integrated circuit 11 (see FIG. 3 described later) mounted on the diaphragm cover 7. controlled. The heating coil and the hybrid integrated circuit 11 are electrically connected by lead wires 12 . The diaphragm housed in the diaphragm chamber 6 opens and closes the secondary throttle valve using the negative pressure of the bench lily, and when the negative pressure in the primary flow path 4 is low, that is, the primary throttle valve When 5 is closed,
The negative pressure on the diaphragm is low and the secondary throttle valve does not open at this time. When the accelerator pedal is depressed to open the primary throttle valve 5, the airflow velocity in the primary flow path 4 increases, which causes negative pressure to act on the diaphragm, which drives the secondary throttle valve to open.

FIG. 2 is a sectional view of the diaphragm cover 7. At the top 13 of this diaphragm cover 7,
A recess 14 is formed in which the hybrid integrated circuit 11 is housed. recess 1
4 is covered with a lid 15.

FIG. 3 is a plan view of the diaphragm cover 7 with the lid 15 removed, and FIG. 4 is a side view of the diaphragm cover 7 with the lid 15 removed. The carburetor 1, diaphragm chamber 6, diaphragm cover 7, etc. are made of aluminum. A ceramic substrate 1 on which an electronic circuit element 35 is printed or vapor-deposited is placed in the recess 14.
6 is fixed. Lead wires 17 and 19 are connected to the electronic circuit element 15. Lead wire 17,
19 is connected to the lead wire 12 via the relay terminal 20 within the recess 14 . The relay terminal 20 is located in the recess 1
4 is formed on a substrate 21 made of an electrically insulating material fixed to the diaphragm cover 7. The lead wire 19 is grounded to the diaphragm cover 7 through a terminal piece 22 . The substrate 35, the electronic circuit element 15, and the lead wires 17, 19 are covered with a filler 23 such as silicone synthetic resin or rubber, and the hybrid integrated circuit 11 is thus integrally formed within the recess 14. The diaphragm cover 7 serves to protect the hybrid integrated circuit 24 and dissipate heat.

FIG. 5 is an enlarged sectional view of the relay terminal 20.
A terminal piece 25 is fixed to the substrate 21. Lead wires 12 and 17 are electrically connected via this terminal piece 25. As shown in FIG. 6, the terminal piece 25 includes a base portion 27 having a mounting hole 26 and a connecting portion 28 that is continuous with the base portion 27 at an angle of, for example, 90°, and has good electrical conductivity. It is constructed by bending a plate-like material such as copper. Board 2
1 is provided with an insertion hole 29 in its thickness direction. The eyelet 30 shown in FIG. 7 consists of a cylindrical portion 31 and a top portion 32. The cylindrical portion 31 is inserted through the insertion hole 26 of the terminal piece 25 and the insertion hole 29 of the board 21, and the free end of the cylindrical portion 31 is pushed outward to form a flange 33. .
In this way, the board 21 and the terminal piece 25 are connected to the eyelet 30.
It is fixed integrally by. The eyelet 30 is made of a material with good electrical conductivity, such as copper. In this way, the eyelet 30 and the terminal piece 25 are electrically connected. The conducting wire 12a from which the insulating coating of the lead wire 12 has been peeled off is inserted through the eyelet hole 34 of the eyelet 30, and the tip end 37 of the conducting wire 12a is bent along the top portion 32. In this state, solder 38 is applied from the tip 37 side of the conductive wire 12a. Electrical connection between the conducting wire 12a and the eyelet 30 is thereby achieved. The solder 38 enters into the eyelet hole 34 by capillary action. Therefore, the reliability of the electrical connection between the eyelet 30 and the conducting wire 12a is improved.
The solder 38 is applied from the top 32 of the eyelet 30 to the base 27 of the terminal piece 25 as shown in FIG. 5 to achieve a reliable electrical connection. Terminal piece 25
The lead wire 17 is soldered to the connecting portion 28 with solder 39 .

As described above, according to the present invention, since the hybrid integrated circuit is configured in the recess formed in the upper part of the diaphragm cover, the number of parts is reduced compared to the above-mentioned prior art, and the manufacturing process is therefore simplified. It is simplified, and it is possible to make it smaller and lighter.
The cost is reduced and vibration resistance strength is improved. In addition, in this invention, the diaphragm chamber is fixed to the vaporizer, and a hybrid integrated circuit is provided in the recess at the top of the metal diaphragm cover that covers the diaphragm chamber, so that heat is conducted from the diaphragm cover to the vaporizer. This improves heat dissipation.

Furthermore, since the hybrid integrated circuit is configured within the recess, the hybrid integrated circuit is protected from the radiant heat of the internal combustion engine.

Furthermore, in a hybrid integrated circuit, since electronic circuit elements are formed on a ceramic substrate, a sufficient heat dissipation effect can be achieved in this respect as well. Such a configuration with excellent heat dissipation of the present invention cannot be achieved by, for example, U.S. Pat.

[Brief explanation of the drawing]

FIG. 1 is an overall system diagram of an embodiment of the present invention, FIG. 2 is a sectional view of the diaphragm cover 7 shown in FIG. 1, and FIG.
4 is a side view of the diaphragm cover 7 shown in FIG. 3, FIG. 5 is an enlarged sectional view of the relay terminal 20, FIG. 6 is a perspective view of the terminal piece 25, and FIG. The figure is a perspective view of the eyelet 30. DESCRIPTION OF SYMBOLS 1... Carburetor, 2... Chiyoke valve, 3... Electrothermal automatic chiyoke device, 7... Diaphragm cover, 11
...Hybrid integrated circuit, 12, 17, 19...Lead wire, 14...Recess, 20...Relay terminal.

Claims (1)

[Scope of utility model registration request] A diaphragm for driving a secondary throttle valve provided in connection with a two-barrel carburetor is housed, a diaphragm chamber attached to the carburetor is covered by a metal diaphragm cover, and a metal diaphragm cover is integrally attached to the top of the diaphragm cover. A ceramic substrate is fixed to the inner wall of this recess on which an electronic circuit element is formed to control a heating coil for heating a bimetallic valve drive included in an electrothermal autochoke device. A control device for a vaporizer, characterized in that a filler is filled in the recess to constitute a hybrid integrated circuit.