JPH0241537Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is an indicator instrument equipped with a motorcycle, a construction machine, an agricultural machine, etc., and is equipped with a ventilation hole to prevent the fogging phenomenon of a protective cover such as a windshield, especially an instrument case having a ventilation hole. This invention relates to an indicating instrument in which a printed circuit board is arranged.

An example of a conventional indicating instrument of this kind will be described with reference to FIG. 6. A printed circuit board 3 is disposed at the bottom of the instrument case 1 through a catch 2 in parallel with the bottom,
In addition, the instrument body 4 is housed and fixed within the instrument case 1. Further, a protective cover 5 such as a front glass is provided on the front side of the instrument case 1, and a plurality of ventilation holes 6 are provided on the bottom side to allow air to flow between the inside and outside of the instrument case 1. An external wall 7 is formed protruding from the outside of the ventilation hole 6 and extends from the traveling direction toward the rear. Note that a cylindrical portion 8 may be continuously provided on the outside of the ventilation hole 6 as shown in FIG.

However, in the conventional example described above, the structure is such that the external wall 7 or the cylinder part 8 prevents water droplets from entering the instrument case 1 through the ventilation hole 6. Due to this, water droplets and dust may enter through the ventilation hole 6, and there is a fear that the water droplets and the like may cause electrical trouble to the printed circuit board 3.

Furthermore, when a relatively wide printed circuit board 3 is arranged parallel to the bottom of the instrument case 1 as shown in FIG. 6, the inside of the instrument case 1 is partitioned into upper and lower parts by the printed circuit board 3. This may result in poor convection.

The purpose of this invention is to solve the above-mentioned problems by providing an indicating instrument equipped with a ventilation structure that can effectively prevent water droplets and dust from entering through the ventilation hole, and also that can hold a printed circuit board. A ventilation hole is provided in the instrument case, and the instrument body and the printed circuit board are housed in the instrument case. a cylindrical ventilation guide wall having a locking portion on which the printed circuit board is inserted, the printed circuit board being inserted into the ventilation guide wall and placed on the locking portion, and the locking portion provided on the ventilation guide wall; This makes it possible to place a printed circuit board, and at the same time, the ventilation guide wall prevents water droplets and dust from entering.

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

FIG. 1 shows a first embodiment, in which 11 is an instrument case, and a pair of ventilation holes 12 are provided at the bottom. 13 communicates with the ventilation hole 12 and connects the instrument case 1
It is a cylindrical ventilation guide wall formed to protrude inwardly from the wall 1, and has a ventilation guide path 13a formed therein and an opening 13 at the upper end of the ventilation guide path 13a.
b, a large-diameter portion 13c is formed on the lower side of the outer peripheral surface of the ventilation guide wall 13, and a small-diameter portion 13d is formed on the upper side, and a step portion between the large-diameter portion 13c and the small-diameter portion 13d is formed. A locking portion 15 on which a printed circuit board 14 is placed is formed. 16 is printed circuit board 1
4, the through hole 16 is inserted into the opening 13b of the cylindrical ventilation guide wall 13, and the printed circuit board 14 is placed and held on the stepped locking portion 15, The opening 13b of the cylindrical ventilation guide wall 13 is located further inward of the instrument case 11 than the printed circuit board 14. Reference numeral 17 denotes a meter body disposed within the meter case 11. 18 is a protective cover disposed on the front side of the instrument case 11. 1
Reference numeral 9 denotes a display panel such as a dial plate fixed to the instrument body 17.

Therefore, even if water droplets and dust enter through the ventilation hole 12, the intrusion of water droplets and dust is suppressed within the ventilation guide path 13a formed by the cylindrical ventilation guide wall 13, and from the opening 13b of the ventilation guide wall 13 into the instrument case. 11 is prevented.

Further, since the opening 13b is located on the inner side of the instrument case 11 than the printed circuit board 14, electrical failure of the printed circuit board 14 can be prevented without directly affecting the printed circuit board 14. Further, the opening 13b of the ventilation guide wall 13 is connected to the printed circuit board 14.
Since it is located on the inner side of the instrument case 11, outside air can easily flow into the protective cover 18 side, and the clouding phenomenon of the protective cover 18 can be effectively prevented. Further, since a locking portion 15 is formed on the outer peripheral surface of the ventilation guide wall 13, it becomes possible to hold the printed circuit board 14 by the locking portion 15, and the function of holding the printed circuit board 14 is transferred to the ventilation guide wall. This can be achieved by the locking part 15 provided at 13.

FIG. 2 shows a second embodiment, in which the same parts as in the first embodiment are denoted by the same reference numerals. Reference numeral 11 denotes an instrument case, and a pair of ventilation holes 12 are provided at the bottom. Reference numeral 13 designates a cylindrical ventilation guide wall that communicates with the ventilation hole 12 and projects inward of the instrument case 11, and has an opening 1 at the upper end of the ventilation guide path 13a.
3b, a large diameter portion 13c is formed on the lower side of the outer peripheral surface of the ventilation guide wall 13, and a small diameter portion 13d is formed on the upper side.
A locking portion 15 on which the printed circuit board 14 is placed is formed by a stepped portion between the large diameter portion 13c and the small diameter portion 13d. 20 is instrument case 1
This is a catch placed on the bottom of 1.

16 is a through hole provided in the printed circuit board 14, and the through hole 16 is inserted into the opening 13b of the cylindrical ventilation guide wall 13, and the printed circuit board 14
is placed and held on the locking portion 15 and the seat 20, and the printed circuit board 14 is secured to the seat 20 with the screws 21.
Attach to. Reference numeral 22 denotes an external wall formed on the outside of the ventilation hole 12 with its tip protruding rearward from the traveling direction.

Therefore, as in the first embodiment, intrusion of water droplets and dust can be prevented, and the printed circuit board 14 can be held well.

FIG. 3 shows a third embodiment, in which the same parts as in the first embodiment are denoted by the same reference numerals. Reference numeral 11 denotes an instrument case, and a vent hole 12 is provided at the bottom. 13 communicates with the ventilation hole 12 and connects the instrument case 1
It is a cylindrical guide wall formed to protrude inwardly from the vent guide wall 1, and has a ventilation guide path 13a formed therein, and a protruding wall 23 is formed at a suitable position on the inner circumferential surface of the ventilation guide path 13a. Reference numeral 15a denotes a fitting groove-shaped locking portion formed on the upper outer peripheral surface of the ventilation guide wall 13. A slit 24 is vertically provided on the side of the opening 13b of the ventilation guide wall 13, and the opening 13b is inclined toward the center to facilitate press-fitting of the printed circuit board 14. 16
is a through hole provided in the printed circuit board 14, and this through hole 16 is press-fitted from the opening 13b side, and the printed circuit board 14 is fitted and placed in the fitting groove-shaped locking portion 15a and held. There is.

As in the first embodiment, therefore, infiltration of water droplets and dust can be prevented, and the printed circuit board 14 can be held well by press-fitting the printed circuit board 14 and fitting it into the fitting groove-shaped locking portion 15a.

FIG. 4 shows a fourth embodiment, in which the same parts as in the first embodiment are denoted by the same reference numerals. An opening 13b is formed at the upper end of the ventilation guide path 13a, and an opening 13b is formed below the outer peripheral surface of the ventilation guide wall 13. A large diameter portion 13c is formed on the side and a small diameter portion 13d is formed on the upper side, and the large diameter portion 1
3c and the small diameter portion 13d form a locking portion 15 on which the printed circuit board 14 is placed, and a plurality of protruding walls 25 are vertically provided at intervals on the circumferential surface of the small diameter portion 13d. ing. 16a is the printed circuit board 14
The receiving groove 16a is press-fitted into the receiving groove 16a from the opening 13b side through the protruding wall 25, and the printed circuit board 14 is placed and held on the locking part 15, As in the first embodiment, it is possible to prevent water droplets and dust from entering, and the printed circuit board 14
has good retention.

FIG. 5 shows a fifth embodiment, in which the same parts as in the first embodiment are denoted by the same reference numerals. An opening 13b is formed at the upper end of the ventilation guide path 13a, and an opening 13b is formed below the outer peripheral surface of the ventilation guide wall 13. A large diameter portion 13c is formed on the side, and a first small diameter portion 13d and a second small diameter portion 1 are formed on the upper side.
3e, and the large diameter portion 13c and the first and second
The upper locking part 1 on which the printed circuit boards 14, 14a are placed by the stepped part with the small diameter parts 13d, 13e.
5a and a lower locking portion 15b, and a plurality of protruding walls 2 are formed on the circumferential surface of each small diameter portion 13d, 13e.
5 are arranged vertically at intervals. Further, the two printed circuit boards 14 and 14a are provided with through holes 16b and 16c that fit into the first small diameter portion 13d and the second small diameter portion 13e, respectively.

Through holes 1 are provided in the two printed circuit boards 14 and 14a from the opening 13b side of the cylindrical ventilation guide wall 13.
6b and 16c are press-fitted, and one printed circuit board 14 is placed and held in the lower locking portion 15b and the other printed circuit board 14a is placed and held in the upper stepped locking portion 15a. Therefore, as in the first embodiment, intrusion of water droplets and dust can be prevented, and the plurality of printed circuit boards 14, 14a can be held well.

As described above, the present invention provides a ventilation hole in the instrument case, and the instrument body and printed circuit board are housed within this instrument case, and the inner side of the instrument case communicates with the ventilation hole. In addition, a cylindrical ventilation guide wall having a locking portion for placing the printed circuit board on the outer peripheral surface is provided, and the printed circuit board is inserted through the ventilation guide wall and placed on the locking portion, so that water droplets and In addition to effectively preventing the intrusion of dust, it also improves the exchange between the inside air of the instrument case and the outside air, suppressing the fogging phenomenon of the protective cover, and at the same time, can reduce costs because it can share the function of holding the printed circuit board. The effect is great.

[Brief explanation of the drawing]

Fig. 1 is an overall cross-sectional view of an indicating instrument showing a first embodiment of the present invention, Fig. 2 is a sectional view of the main parts of an indicating instrument showing a second embodiment, and Fig. 3 is a sectional view of the main part of an indicating instrument showing a third embodiment. 4 is a perspective view of the same main part showing the fourth embodiment; FIG. 5 is a perspective view of the same main part showing the fifth embodiment; FIG. 6 is an overall cross-section showing the conventional example. 7 are sectional views of the same essential parts. 11...Instrument case, 12...Vent hole, 13...
...Ventilation guide wall, 14...Printed circuit board, 15...
Locking part.

Claims (1)

[Scope of utility model registration request] A vent hole is provided in the instrument case, and the instrument body and the printed circuit board are housed in the instrument case, and the inner side of the instrument case communicates with the vent hole and has the above print on the outer peripheral surface. A cylindrical ventilation guide wall having a locking part on which the substrate is placed is provided,
An indicating instrument characterized in that the printed circuit board is inserted through the ventilation guide wall and placed on the locking portion.