JP2548098Y2 - Instrument noise prevention structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an instrument for effectively preventing abnormal noise caused by the vibration of a spiral hair spring disposed on the outer periphery of a pointer shaft of the instrument. About.

[0002]

2. Description of the Related Art A spiral hairspring is provided on the outer periphery of a pointer shaft of an instrument for returning the pointer to a zero position or for supplying power to a self-luminous pointer. However, this type of hairspring usually has a resonance point at about 50 Hz, and in an instrument mounted on a vehicle such as an automobile, when vibration near the resonance frequency occurs during traveling, the hairspring is There is a problem in that it easily vibrates at the resonance point and generates abnormal noise.

[0003]

In view of the above, a structure has conventionally been provided in which a contact plate is provided below the hairspring of the instrument with a gap therebetween to prevent the vibration of the hairspring by the contact plate (Japanese Utility Model Laid-Open No. 50-75352). ) Alternatively, an insulator for preventing vibration is provided between two hair springs arranged in two stages in the outer periphery of the pointer shaft, and ribs are radially provided on both surfaces of the insulator to prevent vibration. A structure (Japanese Utility Model Laid-Open No. 60-179870) has been proposed.

However, this kind of conventional vibration preventing structure is
It is effective against the vibration of the hairspring in the thrust direction, but when the hairspring vibrates in the radial direction, there is not much anti-vibration effect. In addition, there was a problem that vibrations were generated larger and interference noises between hairsprings were added, and abnormal sounds having high sound pressure were likely to be generated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is intended to suppress the radial vibration of a hairspring of an instrument and to prevent the generation of abnormal noise due to the vibration of the hairspring. It is an object to provide a sound prevention structure.

[0006]

Therefore, the abnormal noise prevention structure of the meter according to the present invention has a predetermined space around the outer periphery of the pointer shaft.
A hairspring is disposed, and a disc-shaped insulator is fixed to the pointer shaft through a gap above or below the hairspring, and the insulator rotates with the pointer shaft. A predetermined space between the inner peripheral portion of the hair spring and the outer peripheral portion of the pointer shaft
And a vibration-proof convex portion which rotates together with the insulator is provided so as to move the hair spring toward the radially inner peripheral side.
It is configured to suppress movement .

[0007]

[Function / Effect] In an instrument with such a structure, the insulator is fixed to the pointer axis of the instrument, so that the positional relationship between the pointer axis and the insulator is higher than when the insulator is fixed to the instrument frame or other fixed side. Can be mounted on When a vehicle equipped with instruments is running ,
The hair spring is wound inward by the rotation of the pointer shaft.
When the instrument vibrates during traveling and the hairspring inside the instrument vibrates in the radial direction, the hairspring hits the vibration-proof projection located on its inner periphery and Vibration is reliably prevented, and generation of abnormal noise and interference between hair springs is prevented. It is also easy to balance the weight of the insulator
Become.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial cross-sectional view of an instrument having a self-luminous indicator, FIG. 2 is a plan view of an insulator / hairspring assembly of the instrument, and FIG. 3 is a bottom view thereof. In FIG. 1, reference numeral 1 denotes a pointer driving unit of an instrument,
For example, a cross coil type pointer driving mechanism is built in, and the pointer shaft 3 rotated by the driving mechanism protrudes upward.
A cover 2 made of a synthetic resin is fixed on the pointer driving unit 1, and two power supply terminals 4, 5 for supplying power to a self-luminous pointer 7 described later are attached on the cover 2 by caulking. .

A boss 7a of a self-luminous indicator 7 is fitted to the tip of the indicator shaft 3, and an insulator 6 is mounted below the boss 7a.
It is inserted and fixed in. Female contacts 8 and 9 for power supply are fixed to the boss portion 7 a of the self-luminous indicator 7.
Are electrically connected to a discharge tube (not shown), a fluorescent tube, a light emitting element (LED), and the like.

As shown in FIGS. 2 and 3, the insulator 6 is formed of a synthetic resin in the shape of a disk, has a boss portion through which the pointer shaft 3 passes, and has a plurality of radially extending upper and lower surfaces. Are provided so as to protrude radially from a plane. In addition, 2 near the center of the insulator 6
The connector pins 10 and 11 are provided to protrude upward. The two connector pins 10 and 11 are arranged so as to match the plane positions of the female contacts 8 and 9 on the side of the self-light emitting hands.

An inner end of a spiral hair spring 12 arranged on the upper side is fixed to a terminal portion 10a fixed in the middle of the connector pin 10 by caulking or the like, and an end of the other connector pin 11 (a bottom surface of the insulator). The inner end of the hair spring 13 disposed on the lower side is fixed to the terminal portion 11a fixed on the (side) side. On the other hand, the outer end of the hair spring 12 is fixed to the power supply terminal 5 by caulking or the like, and the outer end of the lower hair spring 13 is fixed to the opposite power supply terminal 4.

An anti-vibration / insulating portion 6b is provided at an inner position of the hair spring 12 on the upper surface of the insulator 6 so as to surround the outer periphery of the connector pin 11, and further, an inner peripheral portion of the hair spring 13 on the lower surface of the insulator 6 is opposed to the inner surface. At the position, a columnar anti-vibration convex portion 6c that protrudes radially of the lower hair spring 13 to protrude through a gap is provided. Further, the outer peripheral portion of the insulator 6 is spaced from the outer peripheral portion of the hair spring 12 by a gap.
An anti-vibration projection 6d for preventing radial vibration is protruded upward, and an anti-vibration projection 6e for similarly prohibiting radial vibration of the hair spring 13 is protruded downward.

The vibration isolating / insulating portion 6b and the vibration isolating convex portions 6c, 6d, 6e are formed on the inner peripheral portion and the outer peripheral portion of the upper hair spring 12 or the lower hair spring 13, that is, outside in the winding diameter direction. Alternatively, they are arranged at positions facing each other with a gap therebetween, and when the hair springs 12 and 13 vibrate in the radial direction, they act to prevent the vibration.

In the instrument constructed as described above, the pointer shaft 3 is rotated by the operation of the pointer driving unit 1 and operates so as to indicate the self-luminous pointer 7 or the indicated value. Is supplied through the power supply terminals 4 and 5, the hair springs 12 and 13, the connector pins 10 and 11, and the pointer 7 emits light.

When the instrument is mounted on a vehicle and the instrument vibrates during traveling, and the hairsprings 12 and 13 vibrate in the radial direction, the hairspring 12 is mounted on the anti-vibration convex portion 6d located on the outer periphery or the inner periphery. The vibration is prevented by hitting the vibration isolating / insulating portion 6b located in the
Numeral 3 hits the anti-vibration convex portion 6e located on the outer peripheral portion or the anti-vibration convex portion 6c located on the inner peripheral portion to prevent the vibration, thereby preventing the generation of noise due to the vibration and interference noise between hair springs. You.

Hairsprings 12 and 13 in the instrument
When the hair vibrates in the thrust direction, the hair spring 1
2 is prevented from vibrating by hitting the rib 6a of the insulator 6 located below, and the lower hairspring 13 is prevented from vibrating by hitting the rib 6a of the insulator 6 located above it, and the abnormal noise due to the vibration is generated. Is prevented from occurring.

Further, even when the hair springs 12 and 13 are subjected to a combined vibration in the thrust direction and the radial direction, similarly to the above, the ribs 6 on both sides of the insulator 6 are provided.
a, the vibration is prevented by the action of the vibration isolating / insulating portion 6b and the vibration isolating convex portions 6c, 6d, 6e. Further, since the vibration isolating / insulating portion 6b on the insulator 6 is arranged to surround the outer periphery of the connector pin 11, the upper hair spring 1
A short circuit between the connector pin 2 and the connector pin 11 having a different polarity is prevented.

In the above-described embodiment, the present invention is applied to an instrument having a self-luminous indicator. However, an instrument having an ordinary indicator, that is, an instrument which only uses a zero return without using a hairspring as an energizing means, is used. Can be applied. in this case,
There is no need to attach connector pins or the like to the insulator.

In the above embodiment, two hairsprings are used. However, in the case of one hairspring,
The present invention can be applied. In the case of a single hair spring, a rib and an anti-vibration projection may be provided only on the upper surface or the lower surface of the insulator. Further, the anti-vibration convex portion may be provided adjacent to (contact with) the hair spring, or an effect can be obtained by providing the anti-vibration portion on either the outer peripheral portion or the inner peripheral portion of the hair spring.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of an instrument showing one embodiment of the present invention.

FIG. 2 is a plan view of the insulator / hairspring assembly.

FIG. 3 is a bottom view of the same.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2;

FIG. 5 is a sectional view taken along line VV of FIG. 2;

[Explanation of symbols]

1-pointer driving unit, 3-pointer shaft, 6-insulator, 6
a-rib, 6c, 6d, 6e-anti-vibration projection, 12, 13-
Hair spring.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hirofumi Imaizumi 1-1 1-1 Showa-cho, Kariya-shi, Aichi Japan Inside of Denso Co., Ltd. 179870 (JP, U) Jiko 99-1649 (JP, Y1)

Claims (1)

(57) [Scope of request for utility model registration] A hairspring is disposed on the outer periphery of a pointer shaft via a predetermined space , and a disk-shaped insulator is provided above or below the hairspring via a gap. Wherein the insulator rotates with the pointer shaft, the insulator is provided in a predetermined space between an inner peripheral portion of the hair spring and an outer peripheral portion of the pointer shaft, and An anti-vibration projection that rotates with the insulator
And suppresses the movement of the hair spring toward the radially inner circumference
A structure for preventing abnormal noise of instruments.