JP3189195B2 - Vehicle instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle instrument for displaying vehicle information on a dial by a pointer attached to a pointer shaft of a movement.

[0002]

2. Description of the Related Art Conventionally, a vehicle instrument as shown in FIG. 3 has been known. This type of instrument is referred to as a cross-coil type instrument, in which a current that varies according to the amount of measurement is applied to a pair of coils that generate magnetic fields that intersect each other, and the direction of the synthesized magnetic field is obtained by synthesizing the magnetic field generated by each coil. Then, the magnet rotor is rotated, and the measurement amount is displayed by a pointer that rotates together with the magnet rotor.

In FIG. 3, reference numeral 1 denotes a coil bobbin.
It is composed of an upper bobbin 1a and a lower bobbin 1b. 2
Denotes a pointer shaft rotatably supported by the upper bobbin 1a and the lower bobbin 1b, and the upper end protrudes from the upper bobbin 1a.

[0004] Reference numeral 3 denotes a magnet rotor, which is a disk having an S pole and an N pole formed, whose center is fixed to the pointer shaft 2, and is disposed inside the coil bobbin 1. 5A, 5
B denotes a coil wound around the outside of the coil bobbin 1 in a direction crossing each other, 6 denotes a movement case, and the movement case 6 includes the coil bobbin 1 and the coil 5.
A, 5B are accommodated, and the magnetic fields generated by the coils 5A, 5B are cut off so as not to affect other parts. The movement 10 is constituted by the coil bobbin 1 to the movement case 6 described above.

[0005] Reference numeral 11 denotes a dial, on which a movement 10 is mounted on the back, and an upper end of the pointer shaft 2 protrudes from a hole 11a. The prism 1 is located on the back side of the dial 11.
5 is disposed and functions to guide light from a light source (not shown) to illuminate the dial 11. 12 indicates a guideline,
It is fixed to the upper end of the pointer shaft 2 protruding from the hole 11a. Reference numeral 13 denotes a meter case.
The dial 11 is attached so that 0 is located, and the dial 14 is attached to the front. Car dual meter 20 is constituted by the movement 10 dial plate 14 as described above.

[0006] The vehicle instrument 20 constructed as described above.
As shown in the figure, is usually mounted in the instrument panel so that the pointer shaft 2 is inclined. When a current that varies according to the measured amount is passed through the coils 5A and 5B, the magnet rotor 3 rotates in the direction of the combined magnetic field obtained by combining the magnetic fields generated by the coils 5A and 5B. Since the dial 12 also rotates and indicates the scale of the dial 11, the measured amount can be visually recognized.

[0007]

However, as shown in FIG. 4, the bearings 1 aa, 1 b of the upper and lower bobbins 1 a, 1 b for receiving the pointer shaft 2 are provided by the oblique arrangement of the instrument for the vehicle.
In 1bb, the load W of the magnet rotor 3 and the pointer shaft 2 is applied in the diagonal direction as N. Particularly, when the pointer 12 is large for a black face, the weight of the pointer 12 affects the frictional force of the bearing portion. This causes a problem that hysteresis occurs in the rotation of the pointer 12 of the vehicle instrument 20. FIG. 5 shows the relationship between the weight of the pointer and the width of the hysteresis.

SUMMARY OF THE INVENTION An object of the present invention is to provide an instrument for a vehicle in which the weight of the pointer is reduced to reduce the hysteresis.

[0009]

The present invention SUMMARY OF] is the vehicle instrument for displaying the vehicle information on the dial by the pointer attached to the pointer shaft of the movement, some guidelines base of the pointer
There is disposed a second Gunetto the pointer cap first magnet and to Rutotomoni formed of resin magnet, the magnet opposite to the first position, the first and second
The structure is such that the load of the pointer on the pointer shaft is reduced by the magnetic action of the second magnet .

In this case, the second magnet may be disposed above the pointer, and the second magnet and the first magnet may be magnetized so as to attract each other.

[0011]

The present invention is configured as described above.
The load of the pointer on the pointer shaft is caused by the mutual magnetic action of the first magnet, which is a resin magnet forming the pointer base or the pointer cap, and the second magnet disposed at a position facing the first magnet. Is reduced by Second magnet is disposed on the upper side of the pointer, in the case where the second magnet and the first magnet is magnetized to draw each other, the pointer is as lifted by the second magnet.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. The same or corresponding portions as those described in the section of the related art are denoted by the same reference numerals, and description thereof will be omitted. FIG.
The, Kazumi施例of the present invention is shown in a schematic diagram. The difference between this vehicle instrument 20 and the one described in the conventional section is that firstly, the base of the pointer or the cap 12
a is formed of a resin magnet, with the upper side being magnetized to the N pole and the lower side being magnetized to the S pole. The pointer base or the pointer cap 12a corresponds to the first magnet according to the present invention.

The next different part is the shape of the prism (light guide plate) 15 for guiding light to the dial 11.
An upper arm 15a is formed by integral molding on the upper side. The second magnet 16 is disposed below the distal end of the arm 15a so as to face the pointer cap 12a. The second magnet 16 is magnetized with an S pole on the lower side and an N pole on the upper side. The arrangement of the second magnet 16 on the arm 15a is as follows.
It may be bonded by an adhesive, or may be made by heat welding, or may be embedded. Further, the magnetization directions of the second magnet 16 and the pointer base or the pointer cap 12a may be reversed. Note that reference numeral 17 in the figure denotes a shielding plate that shields the arm 15a so as not to be seen.

Since the vehicle instrument 20 is configured as described above, the pointer 12 acts so as to be lifted upward by the attraction between the second magnet 16 and the pointer base or the pointer cap 12a. The load of the pointer 12 applied to the pointer shaft 2 is reduced, and the frictional force of the pointer shaft 2 applied to the bearing of the movement 10 is also reduced, so that the hysteresis is reduced.

Next, a reference example of the present invention will be described.
FIG. 2 is a schematic view showing a reference example of the present invention. As shown in the figure, a ring-shaped first magnet 18 is attached to the base of the pointer or the lower side of the pointer cap 12a, and the lower side of the prism 15, which is a position facing the first magnet 18, is formed in a circular shape. The ring-shaped second magnet 16 is arranged in the provided hole 15b. The first magnet 18 has a lower S pole and an upper N pole, and the second magnet 16 has an upper S pole and a lower N pole. Act to repel each other.

The arrangement of the second magnet 16 in the hole 15b of the prism 15 may be performed by bonding with an adhesive, by heat welding, or by embedding. Similarly, the first magnet 18 may be attached to the base of the pointer or the lower side of the pointer cap 12a by an adhesive or by heat welding. The magnetization directions of the first magnet 18 and the second magnet 16 may be reversed.

Since the vehicle instrument 20 is configured as described above, the pointer 12 acts so as to be pushed upward by the repulsive force of the first magnet 18 and the second magnet 16, so that the pointer The load of the pointer 12 applied to the shaft 2 is reduced, and the frictional force of the pointer shaft 2 applied to the bearing of the movement 10 is also reduced, so that the hysteresis is reduced.

[0018]

As described above, according to the present invention,
A vehicle instrument for displaying vehicle information on a dial by a pointer attached to a pointer shaft of a movement, wherein the pointer
Pointer base or pointer cap made of resin magnet
And the first magnet and to Rutotomoni, place the second magnet at a position facing the said first magnetic <br/> Tsu DOO, this
Since the load of the pointer on the pointer shaft is reduced by the magnetic action of the first and second magnets, the frictional force between the pointer shaft and the bearing is reduced, and the hysteresis of the instrument can be reduced. .

[Brief description of the drawings]

It is a schematic diagram of Kazumi施例of the present invention; FIG.

FIG. 2 is a schematic view of a reference example of the present invention.

FIG. 3 is a cross-sectional view of a conventionally known vehicle instrument.

FIG. 4 is a diagram illustrating a defect of a conventionally known vehicle instrument.

FIG. 5 is a diagram showing the relationship between the pointer weight and the indicated hysteresis of the meter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coil bobbin 1a Upper bobbin 1aa Bearing 1b Lower bobbin 1bb Bearing 2 Pointer shaft 10 Movement 11 Dial plate 12 Pointer 12a Pointer cap (first magnet) 16 Second magnet 18 First magnet

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01R 5/16 G01D 11/24 G01R 1/08

Claims (2)

(57) [Claims] 1. A vehicle instrument for displaying vehicle information on a dial with a pointer attached to a pointer shaft of a movement, wherein a pointer base or a pointer cap of the pointer is formed of a resin magnet to be a first magnet. With the first
A second magnet is disposed at a position opposed to the first magnet, and the load of the pointer on the pointer shaft is reduced by the magnetic action of the first and second magnets. 2. The apparatus according to claim 1, wherein the second magnet is disposed above a pointer, and the second magnet and the first magnet are magnetized to attract each other. Instrument for vehicles.