JPS63290969A - Crossing coil type instrument - Google Patents

Abstract

PURPOSE:To simplify a manufacture process by performing terminal processing for crossing coils and connecting the crossing coil to its attached electric circuit and the crossing coil to an electric circuit on a meter case side by a conductive terminal as a single constituent component. CONSTITUTION:The crossing coils 2 and 4 are mounted covering the cylindrical space formed of a base member 6 and a lid member 8 which has a shaft supporting hole 8a on the same axis with a bearing part 6a. A rotary shaft 10 is put in the cylindrical space and the rotary shaft 10 rotates through the mutual operation between magnetic flux produced by the coils 2 and 4 and the magnetic flux of a magnet 12. Winding terminals of the crossing coils 2 and 4 are connected to connection parts 20a, 22a, 24a, and 26a formed projecting from the reverse surfaces of terminals 20, 22, 24, and 26. Further, metallic film resistors 30 and 32 and a printed circuit board are connected to the terminals 20-26.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION (Field of Industrial Application) The present invention relates to a crossed coil type instrument that indicates a measurement result by using the difference in magnetic flux generated in coils that cross each other.

(Prior Art) As is well known, a crossed coil type meter consists of crossed coils that intersect with each other, an accessory circuit that is attached to the crossed coils, and includes a resistor for protecting the crossed coils and for temperature compensation, and the crossed coils. It is constructed by connecting an electric circuit consisting of a meter case circuit consisting of a sensor, etc., formed in a meter case to which the meter is attached, and through which an excitation current is passed.

In order to connect these various electric elements while ensuring high reliability against mechanical vibrations, conventional
As in the technique disclosed in Japanese Patent No. 62, the windings of the crossed coils are terminated in terminals that are press-fitted into a base holding the crossed coils, and the terminals are attached to a printed wiring board on which an electrical connection pattern is drawn. The necessary electrical wiring is done by soldering the cross coil protection/temperature compensation resistors and the electrical circuit formed on the meter case side.

With the above configuration, the crossed coil type instrument has a robust configuration,
It is said that the present invention can be applied to automobile instruments where mechanical vibrations are likely to occur, such as fuel meters and thermometers.

(Problems to be Solved by the Invention) However, even with the above-mentioned crossed coil type meter, it is still not sufficient and has the following problems.

Ensuring reliability against mechanical vibrations is essential to guaranteeing the operation of instruments, but this makes instrument configurations complicated, the manufacturing process complicated, and the cost of managing component parts rising. This resulted in a significant increase in costs.

The present invention was made to solve the above problems, and not only ensures high reliability of the instrument with a robust structure, but also reduces the number of constituent parts and simplifies the manufacturing process. Its purpose is to provide a low-order cross-coil type instrument.

Structure of the Invention (Means for Solving the Problems) - The means constructed by the present invention in order to solve the problems described above include rotatably supporting a magnet inside two coils arranged to intersect with each other. and a crossed coil that indicates the rotation angle of the magnet due to a difference in magnetic flux generated in each coil by connecting a predetermined electric circuit to each coil, based on a pointer fixed to the rotation axis of the magnet. In the meter, the connection member electrically connects each coil to a predetermined meter case, and includes a coil terminal connection portion to which the terminal of the coil is connected, and an accessory circuit connection connected to the electric circuit attached to the coil. The gist of the cross-coil type meter is that it is a conductive terminal having a section and a meter case circuit connection section connected to the electric circuit formed in the meter case.

(Function) The crossed coil type meter of the present invention is provided with a coil terminal connection part where the terminals of the crossed coil are connected to a connecting member that electrically connects the crossed coil to a certain meter case, and which is attached to the crossed coil'. accessory circuit connections connected to electrical circuits;
A conductive terminal having three types of connection parts is used: a meter case circuit connection part that is connected to an electric circuit formed in the meter case. In other words, this conductive terminal accomplishes the terminal processing of the crossed coil and the connection between the crossed coil and the attached electric circuit and the electric circuit on the meter case side. It is constructed as a multifunctional component that functions as a physical structure.

EXAMPLES Hereinafter, in order to explain the present invention more specifically, examples will be given and explained.

(Example) Figure 1 is an exploded assembly diagram of a cross-coil type instrument according to an example, and Figure 2
This figure and FIG. 3 are a plan view and a front sectional view of the same embodiment.

For convenience of explanation, FIG. 1 shows crossed coils 2.
Although 4 is not shown in the figure, each cross coil 2.4 has a base member 6 having a bearing part 6a at the center of the lower part and the same bearing part 6a.
It is attached so as to surround a cylindrical space formed by the cover member 8 having a shaft support hole 8a for supporting the shaft on the axis (see FIGS. 2 and 3). Moreover, in the cylindrical space formed by the base member 6 and the lid member 8,
A rotating shaft 10 rotatably supported by the bearing portion 6a and the shaft support hole 8a is installed inside the rotating shaft 10, and a disc-shaped magnet 12 is fixed to the rotating shaft 10 by AQ or Zn die-casting. Therefore, the rotating shaft 10 is rotatable due to the interaction between the magnetic flux generated by the crossed coils 2 and 4 and the magnetic flux of the magnet 12, but the upper end of the rotating shaft 10 is A pointer 14 is press-fitted and fixed. In order to prevent such magnetic effects from affecting other external instruments, a cylindrical magnetic shielding shield case 16 made of a soft magnetic iron plate is installed on the base member 6.
is arranged to surround. Note that when the magnet 12 is made of an elastic material,
Press-fitting is used for fixing to the rotating shaft 10.

The windings of the crossed coils 2 and 4 are made of polyurethane copper wire,
These winding ends are terminals 20, 22.24.26
Winding connection parts 20a, 22a, 2 protrudingly formed on the lower surface of
After wrapping it around 4a and 26a, it is soldered and processed. Here, the terminals 20 to 2B are formed by pressing conductive metal, and are used for other electrical connections that need to be electrically connected to the crossed coils 2 and 4 connected to the winding connection section. It is constructed by integrally forming a connection part that is a connection point of a circuit. In this embodiment, a metal film resistor 30 is used for temperature compensation to improve the accuracy of the meter, a protective metal film resistor 32 is used to electrically protect the meter, and a sensor is installed in the cross coils 2 and 4. A connection portion is formed that is intended to be connected to an excitation circuit for generating magnetic flux according to the detection result. That is, terminals 20, 24, 26!
Resistance connection portions 20b, 24b, 24c, and 26 are formed protruding from the upper surface to connect the metal film resistors 30 and 32 connected in parallel to the crossed coils 2 and 4. There is. Also, terminal 20, 22.26
Excitation connecting portions 20c, 22b, and 26c are formed protruding from the lower surface to be connected to excitation circuits of the cross coils 2 and 4, which are electric circuits in the combination meter to which the meters are attached. In addition, in order to mechanically fix each terminal 20 to 26 to the base member 6, terminal fixing bosses 6b, 6c, and 6d are provided on the back surface of the base member 6.

6e is provided protrudingly, and each terminal 20-26 has fitting holes 20d, 22 that fit into terminal fixing bosses 6b-6e.
c, 24d, and 26d are drilled.

In this manner, the above-mentioned components are assembled together and constitute the driving portion of the crossed coil type instrument. The assembled drive part is a combination meter case 40 in which an electric circuit is formed to pass an exciting current to the cross coil 2.4.
In order to facilitate installation, a large number of mounting claws 6f are protruded from the back surface of the base member 6 to fit into mounting holes 40a formed in the combination meter case 40. ing. In addition, the mounting claw 6f of the base member 6
When the terminal is fitted into the mounting hole 40a, the excitation connection portion 2 protruding from the lower surface of the terminal 20, 22.
A connection hole 40b into which each excitation connection part is loosely fitted is pre-drilled in the part of the combination meter case 40 where 0C, 22+), and 26C are located. On the other hand, on the back side of the combination meter case 40, a flexible printed circuit board 42 on which an excitation circuit for passing excitation current to the intersecting coils 2 and 4 is drawn is installed in the connecting hole 40b.
It is installed with the connection terminal to be connected to inserted. Therefore, as shown in FIGS. 2 and 3, when the assembled drive section is attached to the combination meter case 40, the connection hole 40b connects the crossed coils 2, 4 of the drive section and the flexible printed circuit board 42 electrically. A connection is made. FIG. 4 shows an enlarged sectional view of the connection hole 40b. In this embodiment, in order to keep the connection more robust against mechanical vibration, a connection part 20c is provided in each connection hole 40b.
, 22 b, 26 c and the connecting terminals of the flexible printed circuit board 42 are inserted into electrically conductive connecting members, and both members are crimped together.

The cross-coil type meter of the embodiment configured as described above has the following effects. That is, the terminals 20 to 20 used for connecting each electrical component
Reference numeral 26 is a component obtained by inexpensive press processing, and also includes crossed coils 2 and 4 and a resistor 30 that require electrical connection.
．． 32 and flexible printed circuit boards 42 can all be connected. Therefore, the configuration of the electric circuit necessary for the meter can be completed by using the terminals 20 to 26, and it is possible to significantly reduce the number of parts and greatly simplify the meter manufacturing process.

Further, the terminals 20 to 26 are easily set upright from the terminal fixing bosses 6b to 6ej of the base member 6, and are held between the base member 6 and the combination meter case 40 when assembling the meter.

Therefore, the terminals 20-2G are completely fixed to the instrument 1, resulting in a robust construction.

In addition, in the above-mentioned embodiment, the base member 6 and each terminal 2
0 to 26 are positioned by the terminal fixing bosses 6b to 6e and held between the combination meter case 40, but the configuration is not limited to this.

For example, as shown in FIG. 5, a wedge-shaped mounting portion 70 is integrally formed on each terminal, and the wedge-shaped mounting portion 70 is press-fitted into a press-fit hole 6g provided in the base member 6, or it is bonded using a thermal or chemical bonding method, etc. The following joining method may be applied.

In addition, terminals 20 to 26 of the silk-finished driving part
Combination meter case 40 flexible
The method of electrically and mechanically connecting and fixing to the printed circuit board 42 is not limited to the use of the connecting member of the above embodiment for 4 days, and various connection and fixing methods may be adopted as necessary.

For example, as shown in FIG. 6, a connecting part 80 with a connecting hole 80a at the tip is provided protrudingly on the bottom surface of each terminal, and the connecting part 80 is passed through the connecting hole 40b to conduct the conductive material. and the coupling hole 8 is closed by the elastic stopper 90.
0a and the flexible printed circuit board 42 may be combined.

As described above in detail with reference to the embodiments, the cross-coil type instrument of the present invention has a conductive terminal that is a single component, and the cross-coil terminal processing, the cross-coil and its attached electrical All the connections between the circuit and the cross coil and the electric circuit on the meter case side and the electrical connections necessary for the meter are achieved.

Therefore, in addition to ensuring the high reliability of the instrument with the same robust structure as before, the number of parts that make up the electrical connection has been significantly reduced, thereby simplifying the manufacturing process and Management labor can be saved and a low-order cross-coil type instrument can be constructed.

[Brief explanation of the drawing]

Fig. 1 is an exploded assembly diagram of the cross-coil type instrument of the embodiment, Fig. 2
The figure is a plan view, Figure 3 is a front sectional view, Figure 4 is an enlarged sectional view of the electrical connection between the drive part and the meter case, and Figure 5 is the connection between the terminal and the base member. FIG. 6 is an explanatory diagram of another embodiment of the connection between the terminal and the meter case.

Claims (1)

[Claims] A magnet is rotatably supported inside two coils arranged to cross each other, and a predetermined electric circuit is connected to each coil, resulting in a difference in magnetic flux generated in each coil. In a crossed coil meter that indicates the rotation angle of the magnet based on a pointer fixed to the rotation axis of the magnet, a connecting member electrically connects each coil to a predetermined meter case, the terminal of the coil a coil terminal connection portion to which the coil is connected, an auxiliary circuit connection portion connected to the electric circuit attached to the coil, and a meter case circuit connection portion connected to the electric circuit formed in the meter case. A crossed coil type instrument characterized by having a conductive terminal.