JPH082618Y2 - Cross coil type indicator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a cross-coil type indicator, and more particularly to a cross-coil type indicator suitable for a speedometer of an automobile.

[Conventional technology]

Conventionally, a current that changes according to a measurement amount is applied to a pair of coils that generate mutually orthogonal magnetic fields, and the magnet rotor is rotated in the direction of a combined magnetic field that combines the magnetic fields generated by the pair of coils. BACKGROUND OF THE INVENTION In-vehicle indicator instruments are often used in which the measured amount is displayed by a pointer that rotates together with a magnet rotor and a dial scale.

FIG. 5 shows a conventional movement 1 of this kind of indicating instrument. This movement 1 is a case 2 in which a coil bobbin 3 is housed inside a cylindrical case body 2 having an open upper end. The coil bobbin 3 has two coils.
4 and 4 are wound so that they are orthogonal to each other. A disk-shaped magnet rotor 5 having an S pole and an N pole is disposed inside each of the coils 4, and a central portion of the magnet rotor 5 is rotatably supported by a coil bobbin 3. The rotating shaft 6 is fixed.

Further, on the peripheral portion of the coil bobbin 3, flange portions 3a, 3a functioning as terminal mounting portions projecting outward from the case body 2 are integrally formed at radial symmetric positions,
The pin-shaped relay terminals 7 connected to the ends of the coils 4 are press-fitted into the two terminal press-fitting holes 3b formed in each flange 3a.

The movement 1 configured as described above is configured such that the flange portion 3a is provided with the screw 11 on the upper surface of the wiring board (HPC) 8 on which various electric components and wiring patterns for converting a measurement signal into a predetermined driving signal are arranged. Is fixed. At this time, the pin-shaped relay terminal 7 is inserted into the terminal hole 8a formed in the wiring board 8, and the terminal hole 8a
The terminal end 7a protruding to the bottom surface of the HPC8 is soldered to the HPC8
By connecting and fixing the wiring pattern on the lower surface, a predetermined electric connection is made.

Then, a predetermined measurement signal such as vehicle speed is input to the HPC 8 via a wire harness or the like (not shown), and the measurement signal is converted into a predetermined current as a drive signal by the HPC 8 and is passed through the pin-shaped relay terminal 7. A pointer and a dial (not shown) attached to the rotating shaft 6 by rotating the rotating shaft 6 in accordance with the combined magnetic field of the magnetic fields generated by the coils 4 And, the measured amount is displayed.

[Problems to be solved by the device]

However, in the above-mentioned conventional indicating instrument, the pin-shaped relay terminal 7 has the press-fitting hole of the flange portion 3a integral with the coil bobbin 3.
Since the coil bobbin 3 and the flange portion 3a thereof are thermally expanded or contracted due to the ambient temperature because they are press-fitted and integrated with the coil bobbin 3, a force to move the pin-shaped relay terminal 7 integrally with the coil bobbin 3 is exerted. There is a problem that the force concentrates on the soldering portion 9 between the pin-shaped relay terminal 7 and the HPC 8, and the soldering portion 9 is cracked, resulting in poor conduction.

Therefore, in view of the above points, the present invention has an object to provide a cross-coil type indicator instrument capable of preventing cracks in the solder connection portion of the pin-shaped relay terminal to the HPC and preventing conduction failure to the coil. There is.

[Means for solving the problem]

In order to solve the above problems, a cross-coil type indicating instrument according to the present invention comprises a cross-coil formed by winding two coils around a coil bobbin so as to cross each other, and a magnet rotatably arranged inside the cross-coil. A pin-shaped relay terminal is press-fitted into a press-fitting hole of a terminal mounting portion integrally formed with the coil bobbin having a rotor, and the cross coil is connected to an upper end of the pin-shaped relay terminal to form a movement. By fixing the movement to the wiring board, connecting the lower end of the pin-shaped relay terminal to the wiring board by soldering, and energizing each coil from the wiring board through the pin-shaped relay terminal. In a cross-coil type indicator instrument in which the magnet rotor is driven to rotate by a predetermined angle according to the combined magnetic field of the generated magnetic fields, the terminal mounting A slit is formed from the lower edge of the terminal mounting portion along the press-fitting hole, the terminal mounting portion divided by the slit is formed in a flexible portion, and the movement is mounted to the wiring board. A projecting piece whose tip is located below the surface is provided so as to project from the flexible portion,
By attaching the movement to the wiring board, the tip of the projecting piece is brought into contact with the wiring board to deform the flexible portion along the slit, and the pin-shaped relay terminal is press-fitted into the press-fitting hole. The feature is that the condition is canceled.

[Action]

In the above configuration, the pin-shaped relay terminal is press-fitted and held in the press-fitting hole of the terminal mounting portion when the movement is not attached to the wiring board. Upon contact, the flexible portion of the terminal mounting portion is deformed along the slit of the terminal mounting portion formed along the press-fitting hole, and the press-fitted state of the pin-shaped relay terminal into the press-fitting hole is eliminated. Therefore, even if the coil bobbin is thermally deformed, the moving force is not applied to the pin-shaped relay terminal, and the coil bobbin and the pin-shaped relay terminal do not move integrally.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 4 show a movement according to an embodiment of a cross-coil type indicating instrument according to the present invention. In the drawings, the same parts as those of the conventional one are designated by the same reference numerals.

In FIG. 1, which is a plan view of the movement according to the present embodiment, and in FIG. 2, which is a sectional view taken along the line AA in FIG.
The movement indicated by reference numeral 1 is HPC8 (see FIG. 2).
A coil bobbin 3 is housed inside a cylindrical case body 2 having an open upper end opposite to the side fixed to the coil bobbin 3. Two coils 4, 4 are orthogonal to each other in the coil bobbin 3. Is wound like.

A disk-shaped magnet rotor 5 having an S pole and an N pole is disposed inside each of the coils 4, and a center portion of the magnet rotor 5 is rotatably supported by a coil bobbin 3. The rotating shaft 6 is fixed.

Further, as shown in FIG. 1, on the peripheral portion of the coil bobbin 3, at a radially symmetrical position thereof, as shown in FIG. 2, a flange portion serving as a terminal mounting portion protruding outward from the case body 2 is provided. 3a, 3a are integrally formed.

Each of the flange portions 3a has a coil bobbin 3 on the case body 2.
The lower end of the coil bobbin 3 is formed to have a vertical length that substantially matches the lower surface of the case body 2, and the flange portion 3a extends vertically on both sides of the radial front portion of the coil bobbin 3. The holding portion 3A is integrally formed.

Each of the terminal holding portions 3A is formed with a vertical length such that the lower end thereof is located slightly above the lower surface of the case body 2,
In order to press-fit the pin-shaped relay terminal 7 into the terminal holding portion 3A by vertically penetrating the inside thereof and temporarily hold the pin-shaped relay terminal 7 with respect to each terminal holding portion 3A when mounting the movement 1. Is formed with a press-fitting hole 3b.

The press-fitting hole 3b is, as shown in the enlarged sectional view of FIG.
It is composed of a terminal insertion guide portion 3b-1 on the terminal insertion end side located on the upper side of the terminal holding portion 3A and a terminal press-fitting portion 3b-2 on the terminal output end side located on the lower side. 2 is formed with an inner diameter slightly smaller than the outer diameter of the pin-shaped relay terminal 7, and the terminal insertion guide portion 3b-1 is larger than the inner diameter of the terminal press-fitting portion 3b-2 and the outer diameter of the pin-shaped relay terminal 7. Is formed by.

Further, on the outer circumference of each terminal holding portion 3A, at a position where the phase is shifted by approximately 180 ° in the circumferential direction of the terminal holding portion 3A, a slit 3c that divides the terminal holding portion 3A into a radially outer side and an inner side of the coil bobbin 3 is formed. Is formed to have a size reaching the press-fitting hole 3b in the radial direction of the terminal holding portion 3A.

The slit 3c is open to the lower end side of the terminal holding portion 3A, and moreover, the slit 3c is the terminal press-fitting portion.
It is formed to have a size equal to or larger than the vertical length of 3b-2, and the upper portion of the slit 3c reaches the lower portion of the terminal insertion guide portion 3b-1.

The terminal holding portion 3A located radially outside of the coil bobbin 3 with respect to the slit 3c expands the terminal press-fitting portion 3b-2 which is deformable in the radial direction of the coil bobbin 3 or from the expanded state. Flexible part 3e to restore the original state
Are formed.

Further, a protruding piece 3d extending from the flexible portion 3e to the outside in the radial direction of the coil bobbin 3 is formed in the lower portion of the flexible portion 3e of each terminal holding portion 3A. The middle portion of the protrusion 3d is bent downward of the movement 1, and the tip of the protrusion 3d is located below the lower surface of the case body 2, that is, the mounting surface of the movement 1 indicated by reference numeral 1a in FIG. It projects slightly downward.

The pin-shaped relay terminal 7 is formed with a size sufficiently larger than the vertical length of the terminal holding portion 3A.

Next, the assembly procedure from press-fitting the pin-shaped relay terminal 7 into the press-fitting hole 3b of the terminal holding portion 3A to fixing the movement 1 to the wiring board 8 and soldering the pin-shaped relay terminal 7 to the HPC 8 is described below. This will be described with reference to FIGS. 3 and 4.

First, the pin-shaped relay terminal 7 is inserted into the press-fitting hole 3b of the terminal holding portion 3A from the terminal insertion guide portion 3b-1 side, and both ends of the pin-shaped relay terminal 7 are projected from the upper and lower ends of the terminal holding portion 3A, respectively. As shown in FIG. 3, the terminal press-fitting portion 3b-2 holds the portion of the pin-shaped relay terminal 7 so that the vertical movement of the pin-shaped relay terminal 7 in the press-fitting hole 3b is restricted, and the terminal is suppressed. The pin-shaped relay terminal 7 is temporarily held in the holding portion 3A.

Next, the ends (leads) of the coils 4 are electrically and mechanically connected to the upper ends 7b of the pin-shaped relay terminals 7 protruding from the upper ends of the terminal holding portions 3A.

Next, the front surface of the HPC8 is applied to the mounting surface 1a of the movement 1, the lower end 7a of the pin-shaped relay terminal 7 temporarily held by the terminal holding portion 3A is inserted into the terminal hole 8a of the HPC8, and the movement is performed from the back surface of the HPC8. The case body 2 and the coil bobbin 3 are fixed to the HPC 8 by the screw movement of the screw 11 inserted into the pin 1, and then the pin-shaped relay terminal 7 protruding from the terminal hole 8a to the back surface side of the HPC 8
The lower end 7a of the above is electrically and mechanically connected to an electric wiring (not shown) on the back surface of the HPC 8 through the soldering portion 9.

Next, the operation will be described.

When the movement 1 is attached to the HPC 8 according to the procedure described above, the protrusion 3d protruding from the lower portion of the flexible portion 3e of each terminal holding portion 3A before the surface of the HPC 8 hits the attachment surface 1a of the movement 1. Contacts the surface of HPC8, and in this state, a slight gap D is formed between the surface of HPC8 and the mounting surface 1a.

Here, the HPC 8 is attached to the mounting surface 1a so as to eliminate the gap D between the surface of the HPC 8 and the mounting surface 1a by tightening the screw 11.
When it is brought further closer to, the flexible portion 3e is bent and deformed by the force applied from the mounting surface 1a to the projecting piece 3d, as shown in FIG.

As a result, the width of the slit 3c is expanded, the inner diameter of the press-fitting hole 3b is expanded to be larger than the outer diameter of the pin-shaped relay terminal 7, and the press-fitting hole 3b is formed.
The pin-shaped relay terminal 7 is no longer held by.

Therefore, when the pin-shaped relay terminal 7 is soldered to the HPC 8 in this state and is solidified by soldering, thereafter, as shown in FIG. 2, the flexible portion 3e is bent and deformed,
The pin-shaped relay terminal 7 is not held by the press-fitting hole 3b, and in the movement 1 after being fixed to the HPC 8, the pin-shaped relay terminal 7 is held by the HPC 8 at its lower end 7a via the soldering portion 9. The Rukoto.

As described above, when the movement 1 is fixed to the HPC 8, the terminal press-fitting portion 3b-2 of the press-fitting hole 3b expands, and the pin-shaped relay terminal 7 inserted in this portion has the terminal press-fitting portion 3b-2.
Since the coil bobbin 3 is no longer held at, the moving force due to thermal expansion or contraction of the coil bobbin 3 is not received, and this moving force is transmitted to the soldering portion 9 between the pin-shaped relay terminal 7 and the HPC 8 via the pin-shaped relay terminal 7. Never. Therefore, the load caused by the thermal deformation is not concentrated on the soldering portion 9 to cause a crack, resulting in poor communication.

〔effect〕

As described above, according to the present invention, when the movement is attached to the wiring board, the projecting piece comes into contact with the wiring board, and the flexible portion of the terminal attachment portion of the terminal attachment portion formed along the press-fitting hole. The pin-shaped relay terminal deforms along the slit, and the pin-shaped relay terminal that was press-fitted and retained in the press-fitting hole when the movement was not attached to the wiring board is released and the coil bobbin, etc. is thermally deformed, but the movement force is pin-shaped relay terminal. In addition, since the coil bobbin and the pin-shaped relay terminal do not move integrally with each other, cracks in the solder connection portion of the pin-shaped relay terminal to the HPC are prevented, and the conduction failure to the coil does not occur.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a movement according to an embodiment of a cross coil type indicator according to the present invention, and FIG. 2 is a sectional view taken along line AA of the movement shown in FIG. 3 is an enlarged vertical sectional view showing the terminal holding portion of the movement shown in FIG. 2 before being attached to the wiring board, and FIG. 4 is an enlarged vertical view of the terminal holding portion of the movement shown in FIG. 2 attached to the wiring board. FIG. 5 is a partially cutaway front view showing the movement of the indicating instrument according to the conventional example. 1 ... Movement, 1a ... Mounting surface, 3 ... Coil bobbin, 3a ... Flange part (terminal mounting part), 3b ... Press-fitting hole,
3c ... slit, 3d ... projection piece, 3e ... flexible part, 4 ... coil, 5 ... magnet rotor, 7 ... pin relay terminal, 8 ... wiring board.

Claims (1)

[Scope of utility model registration request] 1. A terminal integrally formed with the coil bobbin, comprising a cross coil formed by winding two coils around a coil bobbin so as to cross each other, and a magnet rotor rotatably disposed inside the cross coil. The pin-shaped relay terminal is press-fitted and mounted in the press-fitting hole of the mounting portion, and the cross coil is connected to the upper end of the pin-shaped relay terminal to form a movement, and the movement is fixed to the wiring board, and the pin-shaped relay terminal is connected. The lower end of the relay terminal is soldered and connected to the wiring board, and the magnet rotor is predetermined according to the combined magnetic field of the magnetic fields generated by energizing the coils from the wiring board through the pin-shaped relay terminals. In a cross-coil type indicator which is driven to rotate by an angle, a slit is formed in the terminal mounting portion from a lower edge of the terminal mounting portion along the press-fitting hole. And the terminal mounting portion divided by the slit is formed in the flexible portion, and a projecting piece whose tip is located below the mounting surface of the movement with respect to the wiring board is formed from the flexible portion. By projecting and attaching the movement to the wiring board, the tip of the projecting piece is brought into contact with the wiring board to deform the flexible portion along the slit, and the pin shape into the press-fit hole is formed. A cross coil type indicating instrument characterized in that the press-fitting state of the relay terminal is eliminated.