JP2001124606A - Heating resistance element type air flow measuring instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air flow measuring instrument with reduced number of component items, improved workability, lowered manufacturing cost, improved system assembling properties, and capable of accurately detecting a flow rate. SOLUTION: Connector terminals 1, a metallic base 5, and support terminals 2 are formed into one member, or the connector terminals 1 and the support terminals 2 are formed into one member. After it is molded with a module part, the connector terminals and the support terminals are cut off, partly or fully, from the metallic base, or the connector terminals are cut off, partly or fully, from the support terminals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air flow meter, and more particularly to a heating resistor type air flow measuring device which is suitable for constituting an intake system of an automobile engine and detecting and controlling the intake air amount. .

[0002]

2. Description of the Related Art As a prior art heating resistor type air flow measuring device, there is a technology disclosed in Japanese Patent Application Laid-Open No. 11-14423. And a module fixed to a plastic mold module by insert molding.

[0003]

According to the contents of the prior art, a connector terminal for electrically connecting an electronic circuit to an external device, a detecting element for detecting various physical quantities, and an electronic circuit are electrically connected. Since the support terminal for connection and the metal base for fixing to the electronic circuit or for grounding wiring are composed of separate members, respectively, the connector terminal or the support terminal is subjected to insert molding in the plastic mold member. There is a drawback that the metal base is connected to the module part at the time of assembling because of lack of easiness, so that the number of parts, the number of working steps and the cost are increased.

An object of the present invention is to reduce the number of parts, improve workability, and reduce manufacturing costs.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides that the connector terminal and / or the support terminal and the metal base are made of the same member, or that the connector terminal and the support terminal are made of the same member. After insert-molding the connector part and the module part made of plastic mold, a part or the whole is cut between the connector terminal and the support terminal and the metal base, or between the connector terminal and the support terminal.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described.

FIG. 1 shows a first embodiment of the connection terminal structure according to the present invention.

A connector terminal 1 integrally formed for electrically connecting an electronic circuit to an external device, a metal base 5 for fixing the electronic circuit or for short-circuiting to ground, and a detection for detecting various physical quantities A support terminal 2 for electrically connecting the element to an electronic circuit is insert-molded and fixed to a connector housing 3 and a module housing 4 made of plastic mold. After being fixed to the connector housing 3 and the module housing 4, some or all of the connector terminal 1 and the metal base 5 and the support terminal 2 and the metal base 5 are partially cut off to have different functions. It becomes possible.

FIG. 2 shows a second embodiment of the connection terminal structure according to the present invention.

The integrally formed connector terminal 1 and support terminal 2 are insert-molded and fixed to a connector housing 3 and a module housing 4 made of plastic mold. After being fixed to the connector housing 3 and the module housing 4, a part or all of the space between the connector terminal 1 and the support terminal 2 can be cut to have different functions.

According to the embodiment shown in FIGS. 1 and 2, the number of parts is reduced, workability is improved, and the cost is reduced.

FIG. 3 is a sectional view when an embodiment of the present invention is attached to an engine intake air passage as an air flow measuring device. The connector terminal 1, the support terminal 2, and the metal base 5 are integrally formed in a plastic mold together with a connector housing 3 and a module housing 4 for protecting and maintaining the electronic circuit 6, and a heating resistor 7 and a temperature-sensitive resistor 8. Bypass mold 1 formed of a plastic mold provided with an intake air temperature sensor 9
0 is connected to the module housing 4 and is inserted into the intake air passage 13 of the engine, which is the main air passage, and the fixing screw 1
4, the intake air passage 13 is tightened and fixed. As a result, a part of the air flowing through the intake air passage 13 and taken into the engine is diverted to the auxiliary air passage 12, and the total flow is detected from the diverted air.

FIG. 4 shows a vertical cross section of the embodiment shown in FIG. 3, and an embodiment of the components and the assembling method of the invention will be described with reference to FIG. The metal base 5 is a mounting base for fixing the electronic circuit 6 as shown in FIG. The connector section is integrally formed by a connector terminal 1 and a connector housing 3 made of plastic. The housing module portion is in a state in which the periphery of the mounting portion of the electronic circuit 6 is formed by a scab wall, and is integrally formed by the support terminal 2 and the plastic housing module 4. First,
The electronic circuit 6 is mounted on the metal base 5, and a welding pad 15 formed on the circuit side end of the connector terminal 1.
And the electronic circuit 6 are conducted by the conductive line 17. The heating resistor 7, the temperature-sensitive resistor 8, and the intake air temperature sensor 9 are fixed to the support terminal 2 by spot welding so as to be disposed in the auxiliary air passage 12, and then, similarly to the connector terminal, at the support terminal circuit side end. The formed welding pad 18 and the electronic circuit 6 are connected by a conductive line 19 to conduct. After the assembly and connection work of the electronic circuit 6 is completed, the bypass mold 10 is bonded to the module housing 4 and the auxiliary air passage 1 is attached.
Form 2 completely. In this state, the electronic circuit 6 is adjusted, the air is actually flown into the sub air passage to adjust the flow rate versus output characteristics.
1 are adhesively bonded to complete the product of the present invention.

Referring to FIGS. 5 and 6, one embodiment of a method of mounting the heating resistor 7 or the temperature-sensitive resistor 8 and the intake air temperature sensor 9 to the support terminal 2 will be described. FIG. 5 shows a mounting portion of the heating resistor 7, the temperature-sensitive resistor 8, or the intake air temperature sensor 9 in the auxiliary air passage 12 when the module housing 4 is formed. FIG. 6 shows a cross section perpendicular to FIG. Things. As described above, the support terminal 2 is connected and fixed only by the plastic mold forming the module housing 4, and except for the heating resistor, the temperature-sensitive resistor, the mounting portion of the intake air temperature sensor, and the welding pad portion, is placed in the plastic mold. Have been. The heating resistor, the temperature-sensitive resistor, and the intake temperature sensor mounting part are in the sub air passage 1
In this embodiment, the case where the heating resistor 7 and the temperature-sensitive resistor 8, the intake temperature sensor 9 and the support terminal 2 are joined by spot welding is shown.
In the present reference example, by inserting the metal base 5 into the main air passage, the heat transfer between the metal base and the air flow is further improved, and the heat dissipation of the heating resistor type air flow measuring device is increased.
The effect of heat on the heating resistor, the temperature sensing resistor, and the intake air temperature sensor is reduced, and the reliability is improved.

According to the present embodiment, the mounting positions of the heating resistor 7, the temperature-sensitive resistor 8, and the intake air temperature sensor 9 can be freely set depending on the shape of the support terminal and the pattern of the electronic circuit. Considering the thermal effects from
It is also possible to arrange the intake air temperature sensor 9 near the inlet of the sub air passage 12, then the temperature sensitive resistor 8 and the heating resistor 7 near the outlet. Alternatively, the temperature-sensitive resistor 8, the intake air temperature sensor 9, and the heat-generating resistor 7 can be arranged in this order from near the entrance of the sub air passage 12.

[0016]

According to the present invention, since the number of parts can be reduced, the workability of the heating resistor type air flow measuring device can be improved and the price can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing features of a first embodiment of the present invention.

FIG. 2 is a sectional view showing features of a second embodiment of the present invention.

FIG. 3 is a cross-sectional view when one embodiment of the present invention is mounted on an engine intake air passage.

FIG. 4 is a sectional view perpendicular to the section of FIG. 3;

FIG. 5 is a diagram showing an example of a heating resistor, a temperature-sensitive resistor, and an intake temperature sensor mounting portion.

FIG. 6 is a sectional view of FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Connector terminal, 2 ... Support terminal, 3 ... Connector housing (connector part), 4 ... Module housing (module part), 5 ... Metal base, 6 ... Electronic circuit (circuit board), 7 ... Heat-generating resistor, 8 ... Temperature sensing resistor, 9
... intake air temperature sensor, 10 ... bypass mold, 11 ... cover, 12 ... auxiliary air passage, 13 ... intake air passage, 14 ...
Fixing screw.

Claims (4)

[Claims] 1. A connector terminal for electrically connecting an electronic circuit to an external device and / or a support terminal for electrically connecting a detection element for detecting various physical quantities to an electronic circuit. In an electronic device having an electronic circuit, the metal base for fixing the electronic circuit and / or the connector terminal and / or the support terminal is integrally formed of the same member, and is made of a plastic mold for protecting the electronic circuit. The connector terminal and the support terminal and the metal base are partially or wholly cut by insert molding into the connector portion and the module portion after molding, and have different functions. Connecting terminal. 2. The electronic circuit according to claim 1, wherein both the connector terminal and / or the support terminal and the metal base for ground wiring with the electronic circuit are integrally formed with the same member to protect the electronic circuit. It is integrated with the connector part and the module part made of plastic mold by insert molding, and after molding, part or all of the connector terminal or the support terminal and the metal base are cut to have different functions. Characteristic connection terminal. 3. The connector according to claim 1, wherein the connector terminal and the support terminal are integrally formed of the same member, and are integrally formed by insert molding with a connector portion and a module portion made of a plastic mold for protecting an electronic circuit. A connection terminal, characterized in that part or all of the connector terminal and the support terminal are cut off and have different functions. 4. An air flow measuring device provided with any one of the connection terminals according to claim 1.