JPH0710248Y2 - Heat dissipation structure of instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a heat-dissipating structure of an instrument for preventing temperature rise in the instrument for automobiles and the like.

(Prior Art) In a vehicle instrument such as a passenger car, an internal unit such as a speedometer or a tachometer and a lamp for illuminating a dial, a pointer, or the like are incorporated in the same case. In addition, for the purpose of compactness, a combination meter in which a gauge part such as a speedometer and a tachometer and a warning lens part that warns of problems such as temperature, gasoline shortage and oil shortage with a lamp etc. are integrated in the same case. Is also used.

In any of the above cases, the temperature inside the case may rise due to the heat generated from the lamp formed of an incandescent bulb or the like, and the function of the internal unit may deteriorate. As consideration for this heat generation,
Conventionally, the use of heat-generating components should be minimized, or a large number of cutouts 2 should be formed in the upper part of the case 1 as shown in FIG. I was doing. Alternatively, as shown in FIG. 6, the case 1 is provided with a heat radiating plate 3 formed of a metal having a high heat radiating effect, for example, aluminum, and the heat is radiated to the outside through the heat radiating plate 3.

(Problems to be solved by the invention) However, reducing the number of heat-generating components poses a problem of increasing design restrictions. Further, when the notch 2 is formed as shown in FIG.
Dust and the like could easily get inside, which could cause a malfunction of the internal unit. Further, providing the heat sink 3 as shown in FIG. 6 has a problem that the number of parts increases and the cost increases.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a heat-dissipating structure for an instrument that can prevent dust and the like from entering the case with a simple structure and can prevent the temperature inside the case from rising. To aim.

[Constitution of device]

(Means for Solving the Problems) In order to achieve the above-mentioned object, a heat-dissipating structure of an instrument according to the present invention has an air flow communicating with the outside along a side wall in a case in which an internal unit and a lamp are incorporated. A channel is provided, an opening is formed in a partition wall that separates the air flow path from the case body, and the bottom surface of the case is covered with a wiring board.

(Operation) According to the above structure, the heat generated inside the case is dissipated to the outside from the air flow path through the opening formed in the partition wall, so that the temperature inside the case can be prevented from rising. Even if the bottom of the air flow path is open to the outside, since this bottom is covered with the wiring board, it is possible to minimize the intrusion of dust and the like into the case.

(Embodiment) An embodiment of the heat dissipation structure of an instrument according to the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the present invention. 1 and 3, in the same case 10, the dial 21 and the pointer
A gauge portion 20 including an internal unit 22 and an internal unit 23 and a warning lens portion 30 including a lamp 31 and a display portion 32 are integrally incorporated, and a transparent synthetic resin molded body such as an acrylic resin is formed on the front surface thereof. A front glass 40 consisting of is embedded. Further, the lamps 31 provided in the warning lens unit 30 are partitioned by partition plates 33 and 34 one by one, and a partition wall 24 is provided between the inner partition plate 33 and the internal unit 23 in parallel with the partition plate 33. It is provided. An air passage 25 is formed by the partition wall 24 and the partition plate 33, the bottom portion of the air passage 25 is open, and one end of the air passage 25 penetrates the side wall of the case 10 to open to the outside. Further, an opening 26 that connects the gauge portion 20 and the air passage 25 is formed in the upper portion of the partition wall 24. A wiring board 50 is attached to the bottom surface of the case 10 to close the bottom of the air passage 25. The wiring board 50 has a lamp 31 and a lamp for illuminating the inside of the gauge section 20.
27 is installed.

In the above structure, the heat generated by lighting the lamp 27 in the gauge section 20 is introduced into the air passage 25 through the opening 26 formed in the partition wall 24 and flows in the arrow X direction as shown in FIG. It is released to the outside of Case 10. Further, the heat generated by lighting the lamp 31 in the warning lens unit 30 is guided to the inside of the air passage 25 through the partition plates 33 and 34, and is also radiated to the outside. Therefore, the temperature in the gauge section 20 is always kept within a certain preferable range, and therefore, there is no problem such as a display error due to a temperature rise, and the reliability as an instrument can be greatly improved.

Further, contrary to the above description, even when the voltage used in the gauge section 20 is high and the amount of heat generated in the gauge section 20 is large, the generated heat quantity is diffused to the outside through the air passage 25. Therefore, the warning lens unit 30 is not adversely affected by the amount of heat. The bottom of the case 10 is the wiring board
Since it is blocked by 50, it is difficult for dust to enter the inside through the air passage 25.

In the above-described embodiment, the case of the combination meter in which the gauge section 20 and the warning lens section 30 are incorporated in the same case 10 has been described, but it is also applicable to the case of a caterer having only the gauge section 20 and the same. The effect can be obtained.

In this case, as shown in FIG. 4, a partition wall 24 may be provided along the side wall of the case 10 to form an air flow path 25, and the other parts have the same structure as the embodiment shown in FIG. is there.

Further, in each of the above-described embodiments, the case where the gauge section 20 is an analog display has been described, but it goes without saying that it may be a digital display. Further, the numbers of the partition plates 33, 34 and the lamps 31, 27 are not limited to those shown in the figure.

[Effect of device]

As described above, the heat-dissipating structure for an instrument according to the present invention provides an air passage along the side wall in the case to communicate the inside of the case with the outside, thereby suppressing the rise in temperature inside the case. , The reliability of the instrument can be greatly improved.
Further, since the bottom of the case is covered with the wiring board to prevent dust and the like from entering from the bottom of the air passage, it is possible to prevent the occurrence of a failure due to the dust and the like of the instrument.

[Brief description of drawings]

FIG. 1 is a sectional view taken along the line AA in FIG. 3 showing an embodiment of the heat dissipation structure for an instrument according to the present invention, and FIG. 2 is an exploded perspective view seen from the direction of arrow B in FIG. FIG. 4 is a perspective view showing a combination meter to which this embodiment is applied, FIG. 4 is a longitudinal sectional view of an essential portion showing another embodiment of the present invention, and FIGS. 5 and 6 are heat dissipation of conventional meters. It is a perspective view which shows a structure. 10 …… Case 23 …… Internal unit 24 …… Bulkhead 25 …… Air passage 26 …… Opening 27,31 …… Lamp 50 …… Wiring board

Claims (1)

[Scope of utility model registration request] 1. An air flow path communicating with the outside is provided along a side wall in a case in which an internal unit and a lamp are incorporated, and an opening is formed in a partition wall that separates the air flow path from the case body. Heat dissipation structure of the instrument, characterized in that the bottom of the case is covered with a wiring board.